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FREITAS, G.R.
; SOUZA, CARLA D. de
.
Information management methodology in the control of radiation exposure in computed tomography exams.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
2021.
Abstract:
In many Brazilian hospitals, computed tomography (CT) is the imaging equipment with greater ionization capability. Systems for monitoring and managing information are not mandatory and the high monetary value for the 'software' acquisition and training results in the non-investigation of the radiation dose received by the patient. Thus, there is a greater likelihood of unnecessary exposures increasing the probability of damage from exposure to ionizing radiation. These can occur because of exams performed out of protocol, poorly referred, repetition in short intervals of time, and operational failures due to malpractice and lack of training of the professionals involved. International organizations such as Image Gently and Latin Safe promote awareness campaigns every year to reduce and control the exposure dose of patients, with monitoring being a pillar for prevention and reducing patient exposure. The present work developed a low-cost methodology, using free tools for storing and evaluating the DICOM-Structured Report (DICOM-SR) and interpreting these data, which can become an economically viable resource for all diagnostic imaging services of the free Brazilian Unified Health System (SUS). A total of 13,734 exams from 9,911 patients were analyzed from September 2019 to August 2021, divided into groups according to their age group. The program was used specially to optimize the head CT protocol. After the first year of training results showed a radiation dose reduction of 11.7%. The new system provides free and simple monitoring of the number of CT scans and the dose received in comparison with the protocols, which, in turn, will result in clinical recommendations for improving procedures and training.
FREITAS, G.R.; SOUZA, CARLA D. de.
Information management methodology in the control of radiation exposure in computed tomography exams.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/33077. Acesso em: $DATA.
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SCALISE, LEVY
; BURIMOVA, ANASTASIA
; PEREIRA, LUCIANO F.
; FERREIRA, WANDERSON
; SALES, TATIANE
; GONÇALVES, VITOR
; CABRERA-PASCA, GABRIEL; SAXENA, RAJENDRA N.
; CARBONARI, ARTUR W.
.
DFT-based Calculations of the Magnetic Hyperfine Interactions at Cd Sites in RECd Compounds with the FP-LAPW ELK Code.
In: ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, 65th,
November 2-6, 2020,
Online.
Abstract...
2020.
Abstract:
In this work we tested the methodology to map magnetic hyperfine interactions in strongly
correlated materials using a free open-source all-electron FP-LAPW code ELK. The RECd (RE = Ce, Pr, Nd,
Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb) series was chosen as a laboratory system, since an almost complete
set of experimental data on the hyperfine parameters at Cd sites in these compounds was acquired previously
with an extremely sensitive TDPAC technique [1]. Moreover, these TDPAC results were complemented with
WIEN2k DFT calculations that allow a qualitative comparison of the two codes. The ELK calculations were
performed with PBE96 GGA-type exchange-correlation functional, the cases of scalar relativistic approximation
and fully relativistic relaxation of the states were treated separately. A dense k-mesh and adequate R(MT)K(max)
were chosen in both cases to comply with the sensitivity of magnetic hyperfine parameters.
We emphasize that the exploited version of ELK accounted for the contact field only. Yet, as it is the only
contribution expected for Cd site in RECd, the values of B(hf), albeit generally overestimated, have shown
reasonable agreement with the experiment (Fig. 1). Spin-orbit coupling taken into account led to a decrease in
deviation from experimental data. An addition of the Hubbard-like term was essential to reach a tolerable result
for CeCd. This behavior may be associated with a weaker localization of the 4f electron of Ce.
Concerning the potential sources of discrepancy between our ELK results and those previously obtained with
WIEN2k, (i) a different way of accounting for relativistic corrections, (ii) the use of GGA (our ELK study) versus
LDA (previous WIEN2k study) and other details are discussed.
SCALISE, LEVY; BURIMOVA, ANASTASIA; PEREIRA, LUCIANO F.; FERREIRA, WANDERSON; SALES, TATIANE; GONÇALVES, VITOR; CABRERA-PASCA, GABRIEL; SAXENA, RAJENDRA N.; CARBONARI, ARTUR W.
DFT-based Calculations of the Magnetic Hyperfine Interactions at Cd Sites in RECd Compounds with the FP-LAPW ELK Code.
In:
ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, 65th,
November 2-6, 2020,
Online.
Abstract...
2020.
Disponível em: http://repositorio.ipen.br/handle/123456789/33056. Acesso em: $DATA.
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MATOS, IZABELA T.
; SALES, TATIANE S.
; CABRERA-PASCA, GABRIEL; BURIMOVA, ANASTASIA
; SAXENA, RAJENDRA N.
; PEREIRA, LUCIANO F.
; OTUBO, LARISSA
; CARBONARI, ARTUR W.
.
Synthesis and characterization of Fe3O4-HfO2 nanoparticles by magnetization and hyperfine interactions measurements.
In: ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, 65th,
November 2-6, 2020,
Online.
Abstract...
2020.
Abstract:
Nanoparticles (NPs) that combine biocompatibility and enhanced physical characteristics for
biomedical applications are currently an area of intense scientific research. Hafnium oxide NPs is an innovative
approach in the anticancer treatment by radiotherapy due to their low toxicity and enhancement of local dose
in the tumor reducing the total radiation dose for the patient [1]. The combination of this amazing property with
the excellent magnetic hyperthermia performance of Fe3O4 NPs can produce a promising nanomaterial for
cancer therapy. In the present work, we have synthesized NPs samples of Fe3O4 doped with 10%Hf and HfO2
doped with 10% Fe by chemical procedures. The samples had their morphological, structural, and magnetic
properties characterized by some results being displayed in Fig. 1. The crystal structure of the samples was
characterized by X-ray Diffraction (XRD), whose results present a single phase. Transmission Electron
Microscopy (TEM) images show spherical and hexagonal NPs with an average size of 12 nm as displayed in
Fig. 2. The magnetic property was investigated by magnetization measurement. The results from the
temperature dependence of ZFC-FC magnetization show a large peak in the ZFC curve corresponding to a
broad distribution of blocking temperatures as shown in Fig. 1(b). Fortunately, when irradiated with neutrons in
a research reactor, the nuclear reaction 180Hf(n,γ)181Hf yields the probe nucleus 181Hf(181Ta) used by the
perturbed angular correlations (PAC) technique to measure hyperfine interactions. Both samples show electric
quadrupole interaction characteristics of the HfO2 phase indicating that the Fe replaces Hf in HfO2 NPs, but
rather than substituting Fe, Hf form HfO2 NPs diluted in Fe3O4 NPs. Moreover, a pure time-dependent
magnetic dipole interaction below 300 K was observed for Fe3O4 NPs mixed with 10% of HfO2.
MATOS, IZABELA T.; SALES, TATIANE S.; CABRERA-PASCA, GABRIEL; BURIMOVA, ANASTASIA; SAXENA, RAJENDRA N.; PEREIRA, LUCIANO F.; OTUBO, LARISSA; CARBONARI, ARTUR W.
Synthesis and characterization of Fe3O4-HfO2 nanoparticles by magnetization and hyperfine interactions measurements.
In:
ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, 65th,
November 2-6, 2020,
Online.
Abstract...
2020.
Disponível em: http://repositorio.ipen.br/handle/123456789/33055. Acesso em: $DATA.
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RODRIGUES, PRISCILA S.
; MATOS, IZABELA T.
; SALES, TATIANE S.
; BURIMOVA, ANASTASIA
; CABRERA-PASCA, GABRIEL; PEREIRA, LUCIANO F.
; SAXENA, RAJENDRA N.
; OTUBO, LARISSA
; CARBONARI, ARTUR W.
.
Annealing effect on the structural and local magnetic properties of nickel ferrite nanoparticles studied by hyperfine interaction measurements.
In: ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, 65th,
November 2-6, 2020,
Online.
Abstract...
2020.
Abstract:
Nickel ferrite in the form of nanoparticles is a technologically important material that can be
applied for the production of biosensors, catalysts, drug delivery, and magnetic resonance contrast agents. In
this work NiFe O samples comprising spherical nanoparticles of ~6 nm in diameter have been synthesized via
a thermal decomposition route. The quality control of the samples was carried out with conventional
techniques including X-ray diffraction and transmission electron microscopy. Post-synthesis XRD pattern
revealed textured spinel NiFe O . Local magnetic properties were examined with Time Differential Perturbed
Angular Correlation (TDPAC) spectroscopy within the 12 - 773K temperature range with In( Cd) probe
introduced into the samples at synthesis. Quasi-static magnetic properties were observed (including above
room temperature), as expected due to the small time window of TDPAC. The TDPAC results shown in Fig. 1
were analyzed using a model with combined electric quadrupole and magnetic dipole interactions. An
expressive dynamic interaction was observed upon heating after synthesis. A theoretical model based on the
Brillouin function for different ionic moments was applied to study the evolution of the hyperfine magnetic field
with temperature (see Fig. 1-2) and allowed to attribute the magnetic interaction to the probe location at Fe3+ site. Site occupancy and the interplay between magnetic and structural properties are discussed with respect
to application perspectives.
RODRIGUES, PRISCILA S.; MATOS, IZABELA T.; SALES, TATIANE S.; BURIMOVA, ANASTASIA; CABRERA-PASCA, GABRIEL; PEREIRA, LUCIANO F.; SAXENA, RAJENDRA N.; OTUBO, LARISSA; CARBONARI, ARTUR W.
Annealing effect on the structural and local magnetic properties of nickel ferrite nanoparticles studied by hyperfine interaction measurements.
In:
ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, 65th,
November 2-6, 2020,
Online.
Abstract...
2020.
Disponível em: http://repositorio.ipen.br/handle/123456789/33053. Acesso em: $DATA.
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CABRERA-PASCA, G.A.; MAGNO, J.F.; FERREIRA, W.L.
; CAMPOS, A.C.
; BOSCH-SANTOS, B.; SALES, T.S.N.
; PEREIRA, L.F.D.
; BURIMOVA, A.
; SAXENA, R.N.
; FREITAS, R.S.; CARBONARI, A.W.
.
Local inspection of magnetic properties in GdMnIn by measuring hyperfine interactions.
In: ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, 65th,
November 2-6, 2020,
Online.
Abstract...
2020.
Abstract:
GdMn2 is a member of a series of Laves phase containing a rare-earth element and a magnetic 3dtransition
metal with very peculiar magnetic properties[1]. Doping with a non-magnetic element such as
indium affects these properties[2,3]. GdMnIn is reported to crystalize in the hexagonal MgNi2-type
structure presenting a spin-glass behavior with no magnetic order attributed to the triangular spin
frustration of magnetic ions[3]. The observed absence of long-range interactions by magnetization
measurements along with the almost impossible measurements with neutron diffraction due to the
presence of Gd with very high neutron absorption cross section makes the investigation of local exchange
interactions in this compound very difficult. In the present work, measurements of hyperfine interactions
at In sites using 111In(111Cd) probe nuclei were carried out by perturbed angular correlations (PAC)
technique to investigate the local magnetic exchange in GdMnIn compound. Results displayed in Fig. 1 for
the behavior of the major component (Vzz) of the electric field gradient (efg) tensor and the distribution
of electric quadrupole frequency () show a strong instability of the electronic environment of In sites
when temperature decreases indicating a Mn-In disorder. The weak magnetic hyperfine field at In sites
also shown in Fig.1 with an anomalous temperature dependence below around 140 K along with the
increase in the angle between Bhf and Vzz directions suggest a weak long-range exchange interaction.
CABRERA-PASCA, G.A.; MAGNO, J.F.; FERREIRA, W.L.; CAMPOS, A.C.; BOSCH-SANTOS, B.; SALES, T.S.N.; PEREIRA, L.F.D.; BURIMOVA, A.; SAXENA, R.N.; FREITAS, R.S.; CARBONARI, A.W.
Local inspection of magnetic properties in GdMnIn by measuring hyperfine interactions.
In:
ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, 65th,
November 2-6, 2020,
Online.
Abstract...
2020.
Disponível em: http://repositorio.ipen.br/handle/123456789/33052. Acesso em: $DATA.
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TOMACHUK, C.R.
; ELSNER, C.I.; DI SARLI, A.R.; CULCASI, J.D.; COSTA, I.
.
Trivalent chromium conversion layer: a way of enhancing the electrogalvanized steel corrosion protection.
In: ANNUAL MEETING OF THE INTERNATIONAL SOCIETY OF ELECTROCHEMISTRY, 61st,
September 26 - October 1, 2010,
Nice, France.
Abstract...
2010.
TOMACHUK, C.R.; ELSNER, C.I.; DI SARLI, A.R.; CULCASI, J.D.; COSTA, I.
Trivalent chromium conversion layer: a way of enhancing the electrogalvanized steel corrosion protection.
In:
ANNUAL MEETING OF THE INTERNATIONAL SOCIETY OF ELECTROCHEMISTRY, 61st,
September 26 - October 1, 2010,
Nice, France.
Abstract...
2010.
Disponível em: http://repositorio.ipen.br/handle/123456789/33030. Acesso em: $DATA.
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QUEIROZ, F.M.
; ELSNER, C.I.; DI SARLI, A.R.; TOMACHUK, C.R.
; COSTA, I.
.
Effect of Cr III passivation on the corrosion resistance of coated electrogalvanized steel.
In: INTERNATIONAL SYMPOSIUM ON PASSIVITY OF METALS AND SEMICONDUCTORS, 10th,
10-14 April, 2011,
Florianopolis, SC.
Abstract...
2011.
QUEIROZ, F.M.; ELSNER, C.I.; DI SARLI, A.R.; TOMACHUK, C.R.; COSTA, I.
Effect of Cr III passivation on the corrosion resistance of coated electrogalvanized steel.
In:
INTERNATIONAL SYMPOSIUM ON PASSIVITY OF METALS AND SEMICONDUCTORS, 10th,
10-14 April, 2011,
Florianopolis, SC.
Abstract...
2011.
Disponível em: http://repositorio.ipen.br/handle/123456789/33029. Acesso em: $DATA.
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MARTINS, EMERSON A.
; MELO, HERCILIO G. de; COSTA, ISOLDA
.
Using EIS to assess the protection afforded by phosphate layers to PM produced Nd-Fe-B Magnets.
In: ECS MEETING, 216th,
October 4-9, 2009,
Vienna, Austria.
Abstract...
2009.
MARTINS, EMERSON A.; MELO, HERCILIO G. de; COSTA, ISOLDA.
Using EIS to assess the protection afforded by phosphate layers to PM produced Nd-Fe-B Magnets.
In:
ECS MEETING, 216th,
October 4-9, 2009,
Vienna, Austria.
Abstract...
2009.
Disponível em: http://repositorio.ipen.br/handle/123456789/33009. Acesso em: $DATA.
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NETO, MOISES A.M.; DEUS, ENEIO P. de; COSTA, I.
; CORREA, O.V.
; SOBRAL, ANA V.C..
Influência da corrosão no aço inoxidável duplex em solução de cloreto concentrado.
In: CONGRESSO BRASILEIRO DE P&D EM PETRÓLEO E GÁS, 1.,
25-28 de novembro, 2001,
Natal, RN.
Resumo...
2001.
p. 263.
Palavras-Chave:
stainless steels;
corrosion resistance;
chlorides;
mechanical properties;
metallography
NETO, MOISES A.M.; DEUS, ENEIO P. de; COSTA, I.; CORREA, O.V.; SOBRAL, ANA V.C.
Influência da corrosão no aço inoxidável duplex em solução de cloreto concentrado.
In:
CONGRESSO BRASILEIRO DE P&D EM PETRÓLEO E GÁS, 1.,
25-28 de novembro, 2001,
Natal, RN.
Resumo...
2001.
p. 263.
Disponível em: http://repositorio.ipen.br/handle/123456789/32992. Acesso em: $DATA.
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COSTA, ISOLDA
; MARTINS, EMERSON A.
; MELO, HERCILIO G. de.
Corrosion resistance of sintered Nd-Fe-B magnets corrosion and surface treatments for corrosion protection.
In: ECS MEETING, 216th,
October 4-9, 2009,
Vienna, Austria.
Abstract...
2009.
Palavras-Chave:
sintering;
neodymium;
iron;
boron;
phosphates;
surface treatments;
corrosion resistance
COSTA, ISOLDA; MARTINS, EMERSON A.; MELO, HERCILIO G. de.
Corrosion resistance of sintered Nd-Fe-B magnets corrosion and surface treatments for corrosion protection.
In:
ECS MEETING, 216th,
October 4-9, 2009,
Vienna, Austria.
Abstract...
2009.
Disponível em: http://repositorio.ipen.br/handle/123456789/32988. Acesso em: $DATA.
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FONTES, T.F.
; TERADA, M.; PADILHA, A.F.; MAGNABOSCO, R.; COSTA, I.
.
Sensibility of mechanical and electrochemical tests in detecting alpha prime phase in duplex stainless steels aged at 475 ºC.
In: INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS, 11th,
September 20-25, 2009,
Rio de Janeiro, RJ.
Abstract...
2009.
Abstract:
Alpha prime formation leads to material embrittlement and decreases corrosion and mechanical resistance. In the
present study, some tests as microhardness, impact test, electrochemical impedance spectroscopy and cyclic polarization were
performed with the duplex stainless steel (DSS) UR 52N+aged at 475 ºC from 0.5 h to 1,032 h in order to evaluate the sensibility of
these tests in detecting alpha prime presence. After 0.5 h of aging at 475 ºC it was observed that impact test indirectly revealed the
presence of this deleterious phase in the DSS studied, and this test was the most sensible for detecting alpha prime among the other
ones used.
Palavras-Chave:
stainless steels;
corrosion resistance;
microhardness;
mechanical properties
FONTES, T.F.; TERADA, M.; PADILHA, A.F.; MAGNABOSCO, R.; COSTA, I.
Sensibility of mechanical and electrochemical tests in detecting alpha prime phase in duplex stainless steels aged at 475 ºC.
In:
INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS, 11th,
September 20-25, 2009,
Rio de Janeiro, RJ.
Abstract...
2009.
Disponível em: http://repositorio.ipen.br/handle/123456789/32987. Acesso em: $DATA.
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MARQUES, R.A.
; TERADA, M.; SALIBA-SILVA, A.M.
; PADILHA, A.F.; COSTA, I.
.
The comparison of the corrosion resistance of advanced ferritic stainless steels by Mott-Schottky approach.
In: INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS, 11th,
September 20-25, 2009,
Rio de Janeiro, RJ.
Abstract...
2009.
Abstract:
Ferromagnetic stainless steels (SS) have been investigated as potential candidates for dental prosthesis
applications in replacement of magnetic attachments made of noble and expensive alloys. In order to be used as biomaterials, their
corrosion resistance has to be appropriate. The corrosion resistance of passive materials is related to the characteristics of the passive
film formed and this property might be investigated by Mott-Schottky procedure. The capacitance of passive films formed during 2 days
of immersion in a Phosphate Buffered Solution (PBS), at room temperature on PM2000, DIN 1.4575 and 17-4 PH ferritic stainless steels
(SS) was studied by Mott-Schottky approach. A commercial alloy was also analyzed for comparison reasons. The results showed that
films on tested materials behave as both, n-type and p-type semiconductors and the PM2000 presented the highest corrosion
resistance among all materials studied.
Palavras-Chave:
ferritic steels;
biological materials;
stainless steels;
teeth;
prostheses;
corrosion resistance;
impedance
MARQUES, R.A.; TERADA, M.; SALIBA-SILVA, A.M.; PADILHA, A.F.; COSTA, I.
The comparison of the corrosion resistance of advanced ferritic stainless steels by Mott-Schottky approach.
In:
INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS, 11th,
September 20-25, 2009,
Rio de Janeiro, RJ.
Abstract...
2009.
Disponível em: http://repositorio.ipen.br/handle/123456789/32986. Acesso em: $DATA.
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GARCIA, VANESSA S.G.
; TALLARICO, LENITA de F.; ROSA, JORGE M.
; NAKANO, ELIANA; BORRELY, SUELI I.
.
Avaliação ecotoxicológica de efluente têxtil submetido a radiação ionizante.
In: ENCONTRO BRASILEIRO DE MALACOLOGIA, 27.; SIMPÓSIO LATINO AMERICANO DE JOVENS TAXONOMISTAS, 5.,
4-8 de outubro, 2021,
Online.
Resumo...
Rio de Janeiro, RJ: Sociedade Brasileira de Malacologia - SBMa,
2021.
p. 162-162.
Abstract:
O setor têxtil demanda elevada quantidade de água para o processo de beneficiamento das fibras, e adicionalmente gera um grande volume de efluente colorido e com diversos contaminantes. Estes são responsáveis por uma parcela importante na degradação dos corpos hídricos em diversas regiões do mundo, causando efeitos adversos aos ecossistemas. Devido a elevada carga tóxica, composição e coloração, geralmente esses efluentes necessitam de tratamentos complementares para melhorar a degradação. Desta forma, tem-se buscado tecnologias mais eficientes para a oxidação destes contaminantes, com ênfase para os processos oxidativos avançados, como a irradiação por feixe de elétrons. O processo com radiação ionizante promove a radiólise da água com formação de radicais hidroxila ou produtos moleculares que atuam na degradação dos compostos orgânicos. O presente estudo dedicou-se a análise da toxicidade aguda de um efluente têxtil (contendo corante reativo Red 239) em dois níveis tróficos do ambiente aquático, o microcrustáceo Daphnia similis e o caramujo Biomphalaria glabrata. A exposição para D. similis foi de 48 horas e o efeito observado foi a imobilidade dos organismos expostos, já para B. glabrata a exposição foi de 24h e observada a letalidade. Os resultados de toxicidade foram expressos pela CE(L)50 (Concentração efetiva/letal mediana). A radiação ionizante por feixe de elétrons foi proposta como tecnologia para tratamento do efluente visando a redução da toxicidade, sendo avaliadas as doses de 2,5 kGy e 5 kGy. As amostras foram irradiadas em Acelerador de Elétrons (Dynamitron®), com energia fixada em 1,4 MeV. A eficiência da irradiação quanto à redução de toxicidade foi obtida a partir dos valores de CE(L)50, transformados para unidade de toxicidade (UT= 100/CE(L)50). Com relação ao efeito agudo para os organismos avaliados, pode-se observar que o efluente bruto foi mais tóxico para o microcrustáceo, com CE50= 9,61% enquanto para B. glabrata foi obtido o valor de CL50=25,09%. As amostras irradiadas, os valores em relação a redução da toxicidade foram melhores se comparados ao efluente bruto: D. similis, CE50%= 12,62 (2,5 kGy); 17,24 (5 kGy), B. glabrata, CL50= 63% (2,5 kGy) e 70,71% (5 kGy). A partir da dose de 2,5 kGy já foi possível observar eficiência em relação a redução da toxicidade para ambos os organismos. Com 5 kGy, a eficiência em relação a redução de efeitos agudos foi superior a 64% em B. glabrata e superior a 44% para D. similis. Os resultados aqui obtidos confirmam que efluentes industriais, como os do setor têxtil, são críticos do ponto de vista de contaminação ambiental, destacando, assim, a necessidade de melhor gerenciamento, tratamento e descarte adequados destes efluentes. Com a tecnologia por feixe de elétrons, foram obtidos dados promissores em termos de tratamento com diminuição significativa da toxicidade.
GARCIA, VANESSA S.G.; TALLARICO, LENITA de F.; ROSA, JORGE M.; NAKANO, ELIANA; BORRELY, SUELI I.
Avaliação ecotoxicológica de efluente têxtil submetido a radiação ionizante.
In:
ENCONTRO BRASILEIRO DE MALACOLOGIA, 27.; SIMPÓSIO LATINO AMERICANO DE JOVENS TAXONOMISTAS, 5.,
4-8 de outubro, 2021,
Online.
Resumo...
Rio de Janeiro, RJ: Sociedade Brasileira de Malacologia - SBMa,
2021.
p. 162-162.
Disponível em: http://repositorio.ipen.br/handle/123456789/32951. Acesso em: $DATA.
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GARCIA, VANESSA S.G.
; TOMINAGA, FLAVIO K.
; BOIANI, NATHALIA F.
; SILVA, THALITA T.
; ROSA, JORGE M.
; BORRELY, SUELI I.
.
Avaliação da toxicidade de surfactantes não iônico e aniônico submetidos a tratamento por feixe de elétrons.
In: CONGRESSO BRASILEIRO DE ECOTOXICOLOGIA, 16.,
16-19 de agosto, 2021,
Online.
Resumo expandido...
2021.
GARCIA, VANESSA S.G.; TOMINAGA, FLAVIO K.; BOIANI, NATHALIA F.; SILVA, THALITA T.; ROSA, JORGE M.; BORRELY, SUELI I.
Avaliação da toxicidade de surfactantes não iônico e aniônico submetidos a tratamento por feixe de elétrons.
In:
CONGRESSO BRASILEIRO DE ECOTOXICOLOGIA, 16.,
16-19 de agosto, 2021,
Online.
Resumo expandido...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32950. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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QUEIROZ, F.M.
; SERE, P.R.; ELSNER, C.I.; DI SARLI, A.R.; TOMACHUK, C.R.; COSTA, I.
.
Study of the corrosion behavior of electrogalvanised steel/Cr(III) and Zr conversion layer/paint system by electrochemical and visual methods.
In: EUROPEAN CORROSION CONGRESS,
September 8-12, 2014,
Pisa, Italy.
Abstract...
2014.
QUEIROZ, F.M.; SERE, P.R.; ELSNER, C.I.; DI SARLI, A.R.; TOMACHUK, C.R.; COSTA, I.
Study of the corrosion behavior of electrogalvanised steel/Cr(III) and Zr conversion layer/paint system by electrochemical and visual methods.
In:
EUROPEAN CORROSION CONGRESS,
September 8-12, 2014,
Pisa, Italy.
Abstract...
2014.
Disponível em: http://repositorio.ipen.br/handle/123456789/32944. Acesso em: $DATA.
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BARDI, MARCELO A.G.
; MUNHOZ, MARA de M.L.
; MACHADO, LUCI D.B.
.
Effect of transition metal salts on color, gloss and hardness of EB-cured pigmented coatings for polymeric substrates.
In: INTERNATIONAL CONFERENCE ON DEVELOPMENTS AND APPLICATIONS OF NUCLEAR TECHNOLOGIES,
September 11-14, 2011,
Krakow, Poland.
Abstract...
2011.
p. 63-63.
BARDI, MARCELO A.G.; MUNHOZ, MARA de M.L.; MACHADO, LUCI D.B.
Effect of transition metal salts on color, gloss and hardness of EB-cured pigmented coatings for polymeric substrates.
In:
INTERNATIONAL CONFERENCE ON DEVELOPMENTS AND APPLICATIONS OF NUCLEAR TECHNOLOGIES,
September 11-14, 2011,
Krakow, Poland.
Abstract...
2011.
p. 63-63.
Disponível em: http://repositorio.ipen.br/handle/123456789/32941. Acesso em: $DATA.
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-
MARTINS, J.F.T.
; COSTA, F.E.
; SANTOS, R.A.
; MESQUITA, C.H.
; HAMADA, M.M.
.
A comparative study on the performance of radiation detectors from the HgI2 crystals grown by different techniques.
In: INTERNATIONAL CONFERENCE ON DEVELOPMENTS AND APPLICATIONS OF NUCLEAR TECHNOLOGIES,
September 11-14, 2011,
Krakow, Poland.
Abstract...
2011.
p. 192-192.
MARTINS, J.F.T.; COSTA, F.E.; SANTOS, R.A.; MESQUITA, C.H.; HAMADA, M.M.
A comparative study on the performance of radiation detectors from the HgI2 crystals grown by different techniques.
In:
INTERNATIONAL CONFERENCE ON DEVELOPMENTS AND APPLICATIONS OF NUCLEAR TECHNOLOGIES,
September 11-14, 2011,
Krakow, Poland.
Abstract...
2011.
p. 192-192.
Disponível em: http://repositorio.ipen.br/handle/123456789/32940. Acesso em: $DATA.
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CALVO, WILSON A.P.
; MESQUITA, CARLOS H. de
; SPRENGER, FRANCISCO E.
; COSTA, FABIO E. da
; SALVADOR, PABLO A.V.
; CARVALHO, DIEGO V. de S.
; HAMADA, MARGARIDA M.
.
Development of the mechanical system on a third-generation industrial computed tomography scanner in Brazil.
In: INTERNATIONAL CONFERENCE ON DEVELOPMENTS AND APPLICATIONS OF NUCLEAR TECHNOLOGIES,
September 11-14, 2011,
Krakow, Poland.
Abstract...
2011.
p. 133-133.
CALVO, WILSON A.P.; MESQUITA, CARLOS H. de; SPRENGER, FRANCISCO E.; COSTA, FABIO E. da; SALVADOR, PABLO A.V.; CARVALHO, DIEGO V. de S.; HAMADA, MARGARIDA M.
Development of the mechanical system on a third-generation industrial computed tomography scanner in Brazil.
In:
INTERNATIONAL CONFERENCE ON DEVELOPMENTS AND APPLICATIONS OF NUCLEAR TECHNOLOGIES,
September 11-14, 2011,
Krakow, Poland.
Abstract...
2011.
p. 133-133.
Disponível em: http://repositorio.ipen.br/handle/123456789/32939. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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SOMESSARI, SAMIR L.
; FEHER, ANSELMO
; SPRENGER, FRANCISCO E
; ROSTELATO, MARIA E.C.M.
; MOURA, JOAO A.; COSTA, OSVALDO L.
; CALVO, WILSON A.P.
.
Automation system for quality control in manufacture of iodine-125 sealed sources used in brachytherapy.
In: INTERNATIONAL CONFERENCE ON DEVELOPMENTS AND APPLICATIONS OF NUCLEAR TECHNOLOGIES,
September 11-14, 2011,
Krakow, Poland.
Abstract...
2011.
p. 122-122.
SOMESSARI, SAMIR L.; FEHER, ANSELMO; SPRENGER, FRANCISCO E; ROSTELATO, MARIA E.C.M.; MOURA, JOAO A.; COSTA, OSVALDO L.; CALVO, WILSON A.P.
Automation system for quality control in manufacture of iodine-125 sealed sources used in brachytherapy.
In:
INTERNATIONAL CONFERENCE ON DEVELOPMENTS AND APPLICATIONS OF NUCLEAR TECHNOLOGIES,
September 11-14, 2011,
Krakow, Poland.
Abstract...
2011.
p. 122-122.
Disponível em: http://repositorio.ipen.br/handle/123456789/32938. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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MESQUITA, CARLOS H. de
; VASQUEZ, PABLO A.S
; PEREIRA, JOAO C.S. de M.
; MARTINS, JOAO F.T.
; CALVO, WILSON A.P.
; HAMADA, MARGARIDA M.
.
Development of a gamma ray computed tomography technique for random packed columns analysis.
In: REUNIAO DE TRABALHO SOBRE FISICA NUCLEAR NO BRASIL, 31.,
8-12 de setembro, 2008,
Marisias, SP.
2008.
MESQUITA, CARLOS H. de; VASQUEZ, PABLO A.S; PEREIRA, JOAO C.S. de M.; MARTINS, JOAO F.T.; CALVO, WILSON A.P.; HAMADA, MARGARIDA M.
Development of a gamma ray computed tomography technique for random packed columns analysis.
In:
REUNIAO DE TRABALHO SOBRE FISICA NUCLEAR NO BRASIL, 31.,
8-12 de setembro, 2008,
Marisias, SP.
2008.
Disponível em: http://repositorio.ipen.br/handle/123456789/32937. Acesso em: $DATA.
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GONCALVES, J.A.C.
; SOMESSARI, E.S.R.
; NAPOLITANO, C.M.
; SOMESSARI, S.L.
; BUENO, C.C.
.
Transit dose measurements using alanine and diode-based dosimeters.
In: LATIN-AMERICAN CONGRESS ON SOLID STATE DOSIMETRY AND RADIATION MEASUREMENTS, 1st,
September 13-17, 2021,
Online.
Resumo expandido...
2021.
Palavras-Chave:
radiation doses;
accuracy;
alanines;
dosemeters
GONCALVES, J.A.C.; SOMESSARI, E.S.R.; NAPOLITANO, C.M.; SOMESSARI, S.L.; BUENO, C.C.
Transit dose measurements using alanine and diode-based dosimeters.
In:
LATIN-AMERICAN CONGRESS ON SOLID STATE DOSIMETRY AND RADIATION MEASUREMENTS, 1st,
September 13-17, 2021,
Online.
Resumo expandido...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32929. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
SANTOS, S.C.
; RODRIGUES JUNIOR, O.
; CAMPOS, L.L.
.
Synthesis of thulium-yttria nanoparticles with EPR response.
In: LATIN-AMERICAN CONGRESS ON SOLID STATE DOSIMETRY AND RADIATION MEASUREMENTS, 1st,
September 13-17, 2021,
Online.
Resumo expandido...
2021.
Abstract:
Introduction: High dose dosimetry demands a
continuous effort towards the development of new materials
with the aim to guarantee assurance of activities
in which ionizing radiation is used. The present work
reports a hydrothermal synthesis based on a relative
low temperature and pressure to form thulium-yttria
nanoparticles with electron paramagnetic resonance response.
Material and method: Thulium-yttria nanoparticles
(Tm:Y2O3) prepared with 0.1at.%Tm (atomic
percentage, at.%) were synthesized by an eco-friendly
hydrothermal process as reported in previous study[1].
The nanoparticles were characterized by Photon Correlation
Spectroscopy (PCS), X-ray diffraction (XRD),
Scanning Electron Microscopy (SEM), and Electron
Paramagnetic Resonance (EPR).
Results: According to results, the hydrothermal
method provided thulium-yttria nanoparticles with cubic
C-type structure, mean particle size (d50) less than
90nm (Fig.1), and EPR response. The EPR spectra of
powders exhibited two resonance peaks p1 and p2 recorded
at 350 and 160mT, respectively (Fig.2).
Conclusions: The enhancement of the EPR response
of yttria by the use of thulium as a dopant
provide meaningful parameters to advance in the formation
of new rare earth based materials for radiation dosimetry.
Palavras-Chave:
hydrothermal synthesis;
temperature range 0065-0273 k;
pressure dependence;
thulium;
yttrium;
nanoparticles
SANTOS, S.C.; RODRIGUES JUNIOR, O.; CAMPOS, L.L.
Synthesis of thulium-yttria nanoparticles with EPR response.
In:
LATIN-AMERICAN CONGRESS ON SOLID STATE DOSIMETRY AND RADIATION MEASUREMENTS, 1st,
September 13-17, 2021,
Online.
Resumo expandido...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32928. Acesso em: $DATA.
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ALMEIDA, S.B.
; CUNHA, A.P.V.; SAMPAIO, C.C.; MENEGUSSI, G.; CAMPOS, L.L.
.
Small fields dosimetry employing thermoluminescent dosimeters in the clinical aplication of photon beams.
In: LATIN-AMERICAN CONGRESS ON SOLID STATE DOSIMETRY AND RADIATION MEASUREMENTS, 1st,
September 13-17, 2021,
Online.
Resumo expandido...
2021.
Abstract:
Introduction: In radiotherapy, the new techniques have some difficulties such as: beam dosimetry, geo- metric characterization and the use of small radiation fields(1). In some cases, the fields sizes are reduced due to the very small lesions, the simulations of the treat- ment in the planning have a very important role, there- fore, they must be provided with data referring to these small fields. Dosimetry becomes quite complex, as the precision becomes quite contestable, especially when small fields are being used in low density regions(2).
Due to the absence of lateral electronic balance, de- termining the dose in the target volume in small field cases is quite difficult. Another problem for this type of dosimetry is the sharp dose gradient at the edges of the field. However, this fact requires that the choice of the radiation detector must be of a relevant size in the dosimetry of small fields, taking into account some parameters such as: high spatial resolution, density equivalent to water, linearity, reproducibility, regard- less of energy and rate of dose(3).
Material and method: For this analysis LiF:Mg;Ti
(3,15 mm in diameter, 0,9 mm in thickness) and μLiF:Mg;Ti (1 mm x 1 mm) dosimeters produced by Harshaw were used. The irradiation system was the Varian Clinac 6 EX with photon energies of 6MV, with the collimator Multi-leaf Brainlab M3 belonging to the Hospital das Clínicas de São Paulo - HC. In addition, for measurements solid water plates (SW) of 30x30x1cm³ dimension were used. The studied field sizes were 9,8x9,8cm2, 5x5cm2, 4x4cm2, 3x3cm2, 2x2cm2, 1x1cm2 and 05x05 cm2.
.
Results: The dosimeters were selected with TL sensitivity between ±3%. The TL response presented non-significant variation. The dose response curves to photon beams of 6MV presented a linear behavior in the dose range studied (2Gy to 10Gy). Results obtained in simulated irradiations demonstrated the viability of using μLiF:Mg;Ti as dosimeter to dose evaluation of small photon fields with relatively low uncertainties for
this type of application. Table 1 presents the result of TL response of the dosimeters for the studied fields.
Conclusions: The dosimetry of small fields is very complex and difficult due to the dimensions of the fields, however the LiF:Mg;Ti and μLiF dosimeters demonstrated an excellent viability for this type of application due to their dimensions being minimal and showing uncertainties below 3%.
Palavras-Chave:
radiotherapy;
dosimetry;
thermoluminescent dosemeters;
radiation doses;
photon beams
ALMEIDA, S.B.; CUNHA, A.P.V.; SAMPAIO, C.C.; MENEGUSSI, G.; CAMPOS, L.L.
Small fields dosimetry employing thermoluminescent dosimeters in the clinical aplication of photon beams.
In:
LATIN-AMERICAN CONGRESS ON SOLID STATE DOSIMETRY AND RADIATION MEASUREMENTS, 1st,
September 13-17, 2021,
Online.
Resumo expandido...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32927. Acesso em: $DATA.
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-
OLIVEIRA, L.N.
; NASCIMENTO, E.O.; ANTONIO, P.L.
; CALDAS, L.V.E.
.
Plastic bottle caps as radiation detectors for high gamma radiation doses.
In: LATIN-AMERICAN CONGRESS ON SOLID STATE DOSIMETRY AND RADIATION MEASUREMENTS, 1st,
September 13-17, 2021,
Online.
Resumo expandido...
2021.
Abstract:
Introduction: Plastic detectors represent an important
role in radiation dosimetry [1]. They have been
used in a variety of applications, such as portal monitors,
and for solar, cosmic, UV, thermal and gamma radiations.
Dosimetric evaluation is indicated for material
characterization seeking to identify possible applications;
proper preprocessing techniques are critical features
of this process. This work aimed to determine the
linearity response of plastic samples exposed to gamma
radiation, using the Fourier Transform Infrared (FTIR)
measurements technique.
Material and method: Plastic bottle caps were used
as sample detectors. They were composed of a hollow
cylindrical shape with a 14 mm radius, 0.05 mm thickness,
28 mm height and 3.1 g mass, and they were made
of polyethylene (F217). These samples were irradiated
in triplicates, with absorbed doses of 0.01 kGy, 0.05
kGy, 0.10 kGy, 0.25 kGy, 0.50 kGy, 1.0 kGy, 5.0 kGy
and 10.0 kGy using a 60Co Gamma Cell-220 system
(dose rate of 1.089 kGy/h at the Radiation Technology
Center of IPEN). Afterwards, each sample absorbance
spectrum was acquired on a Fourier Transform Infrared
(FTIR) Spectrometer (Frontier/Perkin Elmer) from
400 cm-1 to 4000 cm-1, with 1 cm-1 spectral resolution.
The preprocessing was performed in the raw data
composed by the broadband source interferogram with
a +/- 0.04 cm-1 (2σ) precision for each absorbed dose
profile. Subsequently, applying the Fast Fourier
Transform (FFT), FTIR was generated. Then, the
derivates in the frequency (wavenumber) space were
calculated seeking to assess high-order effects.
The complex FFT coefficients were explicitly
obtained for peak regions, which provided localized
information regarding the spectrum approximate shape
from the FTIR evaluations to obtain linearity
estimatives.
The resulting FTIR spectra for each peak was to
numerical differentiation at the 1st, 2nd and 3 rd orders
(D1, D2 and D3, respectively). The derivates obtained
were useful in achieving the spectra shapes and the
linearity of response.
Results: Figure 1 presents the results after the application
of the PCR method: Predicted absorbed dose versus
absorbed dose, for: I, II and III regions (from spectrum).
The results of the PCR method are the maximum
values for linearity, 1.000 for all regions. This result
demonstrates that the PCR method is more robust than
the linear method, and the preprocessing via PCA provides
the information pertinent to the evaluated plastic
detector.
Conclusion: The results on linearity of response
show that plastic bottle caps represent potential radiation
detectors for high gamma radiation doses.
Palavras-Chave:
plastics;
radiation doses;
fourier transformation;
gamma radiation
OLIVEIRA, L.N.; NASCIMENTO, E.O.; ANTONIO, P.L.; CALDAS, L.V.E.
Plastic bottle caps as radiation detectors for high gamma radiation doses.
In:
LATIN-AMERICAN CONGRESS ON SOLID STATE DOSIMETRY AND RADIATION MEASUREMENTS, 1st,
September 13-17, 2021,
Online.
Resumo expandido...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32926. Acesso em: $DATA.
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CARIBE, P.R.R.V.; BONIFACIO, D.A.B.
; CORDEIRO, L.P.; SILVA, A.M.M. da.
Influence of BPL-based reconstruction algorithm on image quality for quantitative 90Y-PET imaging.
In: LATIN-AMERICAN CONGRESS ON SOLID STATE DOSIMETRY AND RADIATION MEASUREMENTS, 1st,
September 13-17, 2021,
Online.
Resumo expandido...
2021.
Abstract:
Introduction: PET/CT technology and image reconstruction
algorithms are constantly being improved.
This leads to changes in the resulting images which need
to be tested and clinically validated. This study evaluated
the performance and clinical use of the Bayesian
Penalized-Likelihood (BPL) reconstruction algorithm
on the state-of-the-art SiPM-based PET/CT for quantitative
90Y-PET imaging.
Method: An image quality (IQ) phantom with an 8:1 hot
sphere-to-background ratio was scanned on a GE Discovery
MI 3-rings PET/CT system during a single bed
scan. 90Y acquisition time was 14h and 20 min (representative
for clinical count statistics) for an activity concentration
of 218 kBq/ml. Reconstructions were performed
using: 3-iterations OSEM algorithm with 16
subsets and Gaussian post-filter FWHM ranging from
4.5 to 10 mm; BPL-based algorithm employing a block
sequential regularized expectation maximization
(BSREM) with Beta parameter varying from 300 to
3000. Time-of-flight and point-spread function modellings
were included in all reconstructions. Contrast recovery
(CR), background noise levels (coefficient of
variation, COV), contrast-to-noise ratio (CNR) and metabolic
tumour volume (MTV) were compared to investigate
whether the BSREM reconstruction algorithm
leads to an improvement in clinical image quality using
90Y.
Results: The results for CR versus background COV
of the IQ phantom are shown in Fig. 1. All plots show a
similar trend: CRs values were as expected with higher
CRs for lower β and post-filter FWHM values. The Contrast-
to-noise ratio was significantly better in BSREM
reconstructions when compared with OSEM in phantom
studies. In terms of CR mapping, a BSREM β of 1000
corresponded to 5-6 mm post-filter for TOF-OSEM. Regarding
noise characteristics of the 14h data, BSREM
outperformed TOF-OSEM reconstructions in terms of
noise levels with a 2-3 times lower background COV
and improved SUVmean and MATV values for all spheres
sizes. Lowering the counts for 20 min data, BSREM
noise reduction can be controlled by increasing the β-
parameter, but caution should be taken to avoid losing
CR information. An optimal range of 1500-3000 β values,
can provide a compromise between noise and CR at
clinical count statistics.
Conclusions: Based on a quantitative phantom
study, the BPL-based reconstruction algorithm improves
image quality and allows better noise characteristics
for 90Y acquisitions when compared to OSEM reconstructions.
BSREM reconstructions substantially improved
contrast-to-noise ratio and MATVvalues for
longer 90Y measurements with better count statistics.
For clinically relevant count statistics, BSREM with β
values lower than 500 had a limited impact on noise levels
of 90Y-PET.
The potential improvements of BPL applied to dosimetry
calculations are currently being investigated to
determine if BSREM can be used to avoids accuracy
degradation in the absorbed dose distribution aiming at
patient comfort.
Palavras-Chave:
images;
positron computed tomography;
yttrium 90;
algorithms
CARIBE, P.R.R.V.; BONIFACIO, D.A.B.; CORDEIRO, L.P.; SILVA, A.M.M. da.
Influence of BPL-based reconstruction algorithm on image quality for quantitative 90Y-PET imaging.
In:
LATIN-AMERICAN CONGRESS ON SOLID STATE DOSIMETRY AND RADIATION MEASUREMENTS, 1st,
September 13-17, 2021,
Online.
Resumo expandido...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32925. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
Como referenciar este item
-
CAMARGO, F.
; PASCOALINO, K.
; GONCALVES, J.A.C.
; BUENO, C.C.
.
Evaluation of a diffused oxygenated float zone (DOFZ) diode response as a high-dose dosimeter.
In: LATIN-AMERICAN CONGRESS ON SOLID STATE DOSIMETRY AND RADIATION MEASUREMENTS, 1st,
September 13-17, 2021,
Online.
Resumo expandido...
2021.
Palavras-Chave:
dosemeters;
radiation doses;
radiation effects;
decay
CAMARGO, F.; PASCOALINO, K.; GONCALVES, J.A.C.; BUENO, C.C.
Evaluation of a diffused oxygenated float zone (DOFZ) diode response as a high-dose dosimeter.
In:
LATIN-AMERICAN CONGRESS ON SOLID STATE DOSIMETRY AND RADIATION MEASUREMENTS, 1st,
September 13-17, 2021,
Online.
Resumo expandido...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32924. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
OLIVEIRA, L.N.
; NASCIMENTO, E.O.; ANTONIO, P.L.
; CALDAS, L.V.E.
.
Ethylene-vinyl acetate detector exposed to gamma radiation and evaluated via principal component regression.
In: LATIN-AMERICAN CONGRESS ON SOLID STATE DOSIMETRY AND RADIATION MEASUREMENTS, 1st,
September 13-17, 2021,
Online.
Resumo expandido...
2021.
Abstract:
Introduction: Applications of ethylene-vinyl acetate
(EVA) have been reported in radiation physics research,
such as in electron beam irradiations, UV measurements
and microwave irradiations. Gamma radiation
is well known and presents several applications for radiation
dosimetry [1]. The evaluation of EVA and other
dosimeters can be undertaken by the Fourier Transform
Infrared (FTIR) spectrophotometry technique. The goal
of this work was to investigate the effect of gamma radiation
in green, white and black EVA dosimeter samples
for their sensitivity and linearity response, using the
PCR method, and evaluated with the FTIR spectrophotometry
technique.
Material and method: The EVA samples had dimensions
of 0.5 x 0.5 x 0.1 cm3, in colors green, white
and black. These samples were irradiated in triplicates,
with absorbed doses of 0.01 kGy, 0.05 kGy, 0.10 kGy,
0.25 kGy, 0.50 kGy, 1.0 kGy, 5.0 kGy and 10.0 kGy
using a 60Co Gamma Cell-220 system (dose rate of
1.089 kGy/h of the Radiation Technology Center of
IPEN); afterwards, the absorbance spectrum of each
sample was acquired on a Fourier Transform Infrared
(FTIR) spectrometer (Frontier/Perkin Elmer) from
400 cm-1 to 4000 cm-1, with 1 cm-1 spectral resolution.
The linearity of response was evaluated using the
Pearson correlation coefficient (R2). The sensitivity was
set as the linear coefficient from a simple linear
regression that was fitted using the Ordinary Least
Squares Method between the absorbed doses and
absorbance values for each wavenumber in the spectra
for all colors of EVA samples.
The PCR method combines all spectra from
absorbance measurements into a single matrix, called
here as Xnm, where n is the absorbed doses that varied
discreetly from n = 1 up to 8, matching the absorbed
doses of 0.01 kGy, 0.05 kGy, 0.10 kGy, 0.25 kGy,
0.50 kGy, 1.0 kGy, 5.0 kGy and 10.0 kGy, m is the
spectral resolution index, from m = 1 up to 3600,
equivalent to the range from 400 cm-1 to 4000 cm-1.
Results: Predicted absorbed dose versus absorbed
dose data are shown in Figure 1, for the PCR method,
for EVA samples of all colors. The R2 obtained was
1.000 for the PCR method. It can be inferred that these
methods are a good alternative, in the applications that
require assessing linearity response in dosimetry, since
the measurements from each kind of sample may be
transformed in linear results. Consequently, these methods
can be associated with other characteristics from radiation
dosimetry as: reproducibility, fading, spatial
resolution and others.
Conclusion: EVA samples can be considered as a
promising material for measurements of high doses of
gamma radiation.
Palavras-Chave:
vinyl acetate;
ethylene;
polymerase chain reaction;
electron beams
OLIVEIRA, L.N.; NASCIMENTO, E.O.; ANTONIO, P.L.; CALDAS, L.V.E.
Ethylene-vinyl acetate detector exposed to gamma radiation and evaluated via principal component regression.
In:
LATIN-AMERICAN CONGRESS ON SOLID STATE DOSIMETRY AND RADIATION MEASUREMENTS, 1st,
September 13-17, 2021,
Online.
Resumo expandido...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32923. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
Como referenciar este item
-
TRICARICO, JULIANA M.
; SOUZA, CARLA D. de
.
Avaliação em pacientes da radioterapia oncológica em contato direto e não direto com intervenções durante o curso do tratamento: cartilha educativa para pacientes e profissionais da saúde na área de radioterapia com foco em garantir a completude do tratamento.
In: WORKSHOP DO MESTRADO PROFISSIONAL EM TECNOLOGIA DAS RADIAÇÕES EM CIÊNCIAS DA SAÚDE, 3.,
8 de dezembro, 2021,
São Paulo, SP.
Resumo...
2021.
Abstract:
Ao decorrer do tratamento de radioterapia oncológica os pacientes sofrem não somente com as dores físicas mas também com o estigma social que é causado por pressão psicológica de estar acometido com uma doença em que a sociedade chama de “incurável‟. Os profissionais da saúde tem um papel fundamental nesse momento no sentido de ouvir e respeitar as necessidades dos pacientes. O detrimento do estado emocional do paciente pode levar a perda de sessões, atrasos e consequentemente prejudicar o resultado final. Este trabalho tem como objetivo a educação de pacientes e profissionais da saúde, com o objetivo de aumentar a completude dos tratamentos radioterápicos. Isso será atingido por meio de 2 cartilhas contendo informalções que sejam claras e bem discutidas. Informações levadas corretamente através cartilhas e métodos educacionais voltados para a assistencia no campo do paciente oncológico e o seu vinculo de ligação com os profissionais de saúde, não somente educa, mas também gera sensação de segurança e qualidade que contribuem para a completude do tratamento. Embora a maioria das organizações institucionais sejam burocraticas e nem sempre preparam seus profissionais para a capacitação de educação continuada por meio de assitencia com foco na humanização e cuidado centrado no setor da radioterapia, é grande importancia que esse cenario seja olhado atraves de uma nova perspectiva, atraves de mais atenção e capacitação das equipes multi-disciplinares atraves de novas formalizações de planos institucionais que busquem visar e proporcionar para seus pacientes não somente um tratamento, mas também uma contribuição ainda mais valiosa, educando também seus pacientes, para que saibam a finalidade do tratamento, seus beneficios, como lidar com o enfrentaneto da doença e contar com uma rede de apoio disposta a ouvi-los através de cuidado e atenção. As cartilhas serão disponibilizadas gratuitamente em site próprio. Os temas utilizados são: Para Profissionais da Saúde - como o profissional em radioterapia devem se portar dentro setor; de que forma os profissionais em radioterapia devem abordar e auxiliar os pacientes; qual a rotina básica de tratamento no setor de radioterapia; como o profissional da radioterapia devem lidar com uma rotina agitada dentro do setor; quais ajudas os profissionais podem ter dentro ou fora de suas instituições em casos de exaustão; Para o paciente - O que é a radiação; o que radiação faz; o que é a radioterapia; qual a rotina da radioterapia para os pacientes; o que os pacientes podem esperar desse tratamento; quais ajudas os pacientes podem ter além do tratamento.
Palavras-Chave:
neoplasms;
radiotherapy;
human factors;
personnel;
health services;
therapy
TRICARICO, JULIANA M.; SOUZA, CARLA D. de.
Avaliação em pacientes da radioterapia oncológica em contato direto e não direto com intervenções durante o curso do tratamento: cartilha educativa para pacientes e profissionais da saúde na área de radioterapia com foco em garantir a completude do tratamento.
In:
WORKSHOP DO MESTRADO PROFISSIONAL EM TECNOLOGIA DAS RADIAÇÕES EM CIÊNCIAS DA SAÚDE, 3.,
8 de dezembro, 2021,
São Paulo, SP.
Resumo...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32922. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
MARTINS, TAINA M.T.M.
; SOUZA, CARLA D. de.
Perfil epidemiológico de caso de câncer de próstata em centro de referência no estado do Ceará entre o período de 2014 a 2019.
In: WORKSHOP DO MESTRADO PROFISSIONAL EM TECNOLOGIA DAS RADIAÇÕES EM CIÊNCIAS DA SAÚDE, 3.,
8 de dezembro, 2021,
São Paulo, SP.
Resumo...
2021.
Abstract:
No Brasil, o câncer de próstata é o segundo tipo de câncer mais comum entre os homens. Estima-se que no ano de 2020 ocorreram 65.840 novos casos da doença. Durante a campanha do Novembro Azul, o Ministério da Saúde e o Instituto Nacional do Câncer (INCA) desempenham um papel de suma importância para quebrar preconceitos e paradigmas entre os homens, fazendo com que haja uma busca por informações sobre prevenção e tratamento da doença. Este trabalho tem como objetivo fazer uma análise do perfil epidemiológico para câncer de próstata entre o período de 2014 a 2019, utilizando dados do Centro Regional Integrado de Oncologia – CRIO, localizado no Estado do Ceará. Para isso, foi feito uma revisão dos prontuários dos pacientes. Correlações foram criadas a partir do perfil clinico, social, regional e econômico; tipos e justificativas dos tratamentos indicados; fatores de risco associados ao câncer; e correlacionar a incidência com a região do acometido. Foi usado software Jamovi para fazer a análise de correlação de Spearman e Qui-quadrado. A idade média dos pacientes encontrada na amostra desta pesquisa foi de 71,3 anos de idade, a mínima foi de 44 anos e a máxima 96 anos. A análise da escolaridade revelou que 21,5 % dos pacientes são analfabetos e outros 63,5 % possuem apenas o ensino fundamental. A Grande Fortaleza é a região que detém o maior número de pacientes, 52,5 % e o estadiamento que acomete a maioria dos pacientes é o estágio IIB, seguido do III e IV. As principais modalidades de tratamento inicial foram a radioterapia externa, quimioterapia e hormonioterapia.
Palavras-Chave:
neoplasms;
prostate;
epidemiology;
human populations;
statistical data;
patients
MARTINS, TAINA M.T.M.; SOUZA, CARLA D. de.
Perfil epidemiológico de caso de câncer de próstata em centro de referência no estado do Ceará entre o período de 2014 a 2019.
In:
WORKSHOP DO MESTRADO PROFISSIONAL EM TECNOLOGIA DAS RADIAÇÕES EM CIÊNCIAS DA SAÚDE, 3.,
8 de dezembro, 2021,
São Paulo, SP.
Resumo...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32920. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
FREITAS, G.R.
; SOUZA, C.D. de
.
Metodologia de gestão da informação no controle de exposição em exames de tomografia computadorizada.
In: WORKSHOP DO MESTRADO PROFISSIONAL EM TECNOLOGIA DAS RADIAÇÕES EM CIÊNCIAS DA SAÚDE, 3.,
8 de dezembro, 2021,
São Paulo, SP.
Resumo...
2021.
Abstract:
Muitos hospitais brasileiros, a tomografia computadorizada (TC) é o equipamento utilizado para diagnóstico por imagem com maior poder de ionização. Sistemas para monitoramento e gerenciamento de informações não são obrigatórios e o alto valor monetário para aquisição de ‘softwares’ e treinamento faz com que a dose recebida pelo paciente não seja investigada na maioria das vezes. Com isso, existe uma maior probabilidade de exposições desnecessárias ou até proporcionar danos decorrente de exposições a radiação ionizante (STRAUSS et al., 2019). Esses danos podem ocorrer por causa de exames realizados fora de protocolo, mal indicados, repetição em intervalos curtos de tempo e falhas operacionais em decorrência imperícia, falta de atualização e treinamento dos profissionais envolvidos. Organizações internacionais como Image Gently e Latin Safe, promovem todo ano campanhas de conscientização para redução e controle da dose de exposição de pacientes submetidos a exames de diagnóstico por imagem que utilizam radiação ionizante, sendo o controle e/ou monitoramento um dos pilares para prevenção e redução da exposição de pacientes a radiação ionizante para fins médicos. O presente trabalho desenvolveu uma metodologia de baixo custo, utilizando ferramentas gratuitas para armazenamento e avaliação dos DICOM-Structured Report (DICOM-SR) e interpretação desses dados, podendo se tornar um recurso economicamente viável para todos os serviços de diagnóstico por imagem do Sistema Único de Saúde (SUS). Foram analisados 13734 exames de 9911 pacientes no período de setembro de 2019 a agosto de 2021, divididos em grupos de acordo com sua faixa etária. O programa foi utilizado especialmente para otimização do protocolo de TC de Crânio, o que proporcionou uma redução de 11,7% no primeiro ano de treinamento. O novo sistema proporciona gratuitamente e de maneira simples o monitoramento da quantidade de tomografias e da dose recebida em comparação com os protocolos que, por sua vez, resultarão em recomendações clínicas de melhora de procedimentos e treinamentos.
Palavras-Chave:
computerized tomography;
knowledge management;
dosimetry;
dose limits
FREITAS, G.R.; SOUZA, C.D. de.
Metodologia de gestão da informação no controle de exposição em exames de tomografia computadorizada.
In:
WORKSHOP DO MESTRADO PROFISSIONAL EM TECNOLOGIA DAS RADIAÇÕES EM CIÊNCIAS DA SAÚDE, 3.,
8 de dezembro, 2021,
São Paulo, SP.
Resumo...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32919. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
FREIRE, RENAN P.
; SILVA, FELIPE D.
; VITALE, PHELIPE; TODESCHINI, IRIS; MENEZES, FILIPE
; OLIVEIRA, JOAO E. de
; OLIVEIRA, MONA das N.; SOARES, CARLOS R.J.
.
SARS-CoV-2 Spike (S) glycoprotein expression, purification and characterization in suspension human embryonic kidney cells 293.
In: PROTEIN EXPRESSION IN ANIMAL CELLS CONFERENCE, 15th,
September 13-16, 2021,
Online.
Abstract...
2021.
Abstract:
SARS-CoV-2 is a zoonotic virus RNA positive, which became responsible to be the
largest sanitary crisis faced by humanity: Coronavirus disease 2019 (COVID-19). Some
symptoms include major sneeze conditions, who could evolve to severe acute respiratory
syndrome, and in some cases, to death. Techniques for accurate detection of this virus are
essential to promote an accurate diagnosis of infected patients. SARS-CoV-2 has several
targets with clinical interest; although, the focuses is on Spike (S), a homotrimer
glycoprotein, that interacts with angiotensin converting enzyme receptor (ACE2),
developing the infection in host cells. Thus, we recognize that the demand for the
glycoprotein S is necessary, requiring large amounts with high purity level. The current
work has the main objective the transient expression of SARS-CoV-2 S protein into
suspension human embryonic kidney cells 293 (HEK293), purification and
characterization, to use it as a template for discovering new molecular markers. SARSCoV-
2 S modified protein cDNA was inserted into pαH plasmid, amplified, and purified.
For transient recombinant protein expression, 7.5 x 107
HEK293 cells (Expi293FTM cells)
was seeded in 27 mL Expi293™ culture Medium. The transfection was carried out with a
cationic lipid ExpiFectamine™ and 30 μg of plasmid, mixed with 3 mL Opti-Mem®
culture medium. Cell culture was maintained for seven days in 125 mL vent cap
Erlenmeyer, 32 ºC, 8% CO2, under 125 rpm orbital shaker rotation. 10 mL aliquots were
collected on four- and seven-day post transfection, stored at -80 ºC. Physical-chemical
and biological characterizations were determined by SDS-PAGE, ELISA, and Western
Blotting. Purification from 40 mL of conditioned medium was carried out in two steps:
Strep-Tag affinity column, followed by a size exclusion Superose® 6 (10/300), 5.0 mg of
oligomeric recombinant protein with 95% purity was obtained. We believe that this
process can be easily adapted to different volumes, being very useful for obtaining, in a
short time, enough pure and immunological active SARS-CoV-2 S for further studies and
applications, such as, cryogenic electron microscopy, mass spectroscopy, N-glycan
structures, antibody production and immunologic assays development.
Palavras-Chave:
coronaviruses;
glycoproteins;
kidneys;
embryonic cells;
diagnostic techniques
FREIRE, RENAN P.; SILVA, FELIPE D.; VITALE, PHELIPE; TODESCHINI, IRIS; MENEZES, FILIPE; OLIVEIRA, JOAO E. de; OLIVEIRA, MONA das N.; SOARES, CARLOS R.J.
SARS-CoV-2 Spike (S) glycoprotein expression, purification and characterization in suspension human embryonic kidney cells 293.
In:
PROTEIN EXPRESSION IN ANIMAL CELLS CONFERENCE, 15th,
September 13-16, 2021,
Online.
Abstract...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32906. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
LIMA, MAYELLE M.P.
; NASCIMENTO, PAMELA F. do
; NASCIMENTO, ANA C.G.
; VIEIRA, DANIEL P.
.
A simple and quick method to generate in vitro tridimensional tumor bodies from a human breast adenocarcinoma (MCF7) using magnetic aggregation technique.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 382-382.
Abstract:
Tumor physiology studies have to rely on efficient and representative models, as animal-based or in vitro
tridimensional cell constructs. The work used magnetite (Fe3O4) nanoparticles produced by electron-beam induced
chemical reduction to give cells the ability to form aggregates when submitted to a magnetic field, and thus to produce
micro tumors in vitro. The work aimed to produce human breast adenocarcinoma mini tumors (BAMT's) in vitro.
Paramagnetic iron oxide nanoparticles (PION’s) were synthesized through electron-beam induced Fe3+ reduction
and subsequent coprecipitation. Due to its poly-L-lysine coating, PION’s were adsorbed on cell membranes of MCF7
(human breast adenocarcinoma). Cells were seeded in 24-well cell culture plates pre-treated overnight with Pluronic®
F-127 to prevent cell adhesion and kept in culture conditions under magnetic fields for at least 6 days. BAMT's were
differentially stained with Hoescht 33342 and ethidium bromide and imaged by wide-field fluorescence microscopy.
BAMT's appeared as integer and well-defined cellular aggregates, with sparse dead cells stained by ethidium
bromide. These structures can be further used for in vitro tumor studies, as BAMT’s are supposed to be more reliable
models than monolayer cultures. Treatment of wells with poloxamer caused a mild to moderated cell-repellent effect,
similar to those found in commercially available products, only by a fraction of the cost. The experiments succesfully
produced mini tumors prone to be used in in vitro studies.
Palavras-Chave:
carcinomas;
mammary glands;
nanoparticles;
iron oxides
LIMA, MAYELLE M.P.; NASCIMENTO, PAMELA F. do; NASCIMENTO, ANA C.G.; VIEIRA, DANIEL P.
A simple and quick method to generate in vitro tridimensional tumor bodies from a human breast adenocarcinoma (MCF7) using magnetic aggregation technique.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 382-382.
Disponível em: http://repositorio.ipen.br/handle/123456789/32876. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
NASCIMENTO, ANA C.G.
; GALISTEO JUNIOR, ANDRES J.; SILVA, GIOVANA D. da
; ROCHA, LEONARDO W.P. de S.
; VIEIRA, DANIEL P.
.
Effective methodology for maintaining Toxoplasma gondii in vitro using paramagnetic iron nanoparticles to support three-dimensional cell culture.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 377-377.
Abstract:
Toxoplasma gondii is a protozoan parasite that infects approximately one billion people worldwide. Upon infection,
the host may die due to latent infection or presence with chronic cysts in brain, retina or muscle tissue. Humans can
become infected consuming water or foods contaminated with oocysts or eating undercooked meat. Its virulent form
is difficult to replicate in vitro, requiring additional steps using experimental animals. The use of nanotechnology can
contribute to this in vitro production, through the three-dimensional cultivation of mouse fibroblast cells (NIH/3T3
ATCC® CRL-1658™) and nanoparticles synthesized with radiation. The objective of this work was to demonstrate
the three-dimensional culture of fibroblast cells aggregated to nanoparticles for inoculation the T. gondii. This
methodology was created to facilitate parasite management and replication. For the production of nanoparticles, the
work used concentrations of iron sulfate II heptahydrate (Fe2SO4.7H2O, CAS 7782-63-0) and glycine (NH2CH2COOH,
CAS 56-40-6) diluted in ultrapure water free of O2 at pH 12. This solution was irradiated by electron beam of the IPEN
/ CNEN-SP Radiation Technology Center in doses of at least 15 and at most 30kGy. Paramagnetic iron oxide
nanoparticles (PION’s) were then adsorbed on cell membranes, and cells were kept together by a magnetic field.
Structured spheroids (4 day of culture) were infected with 106 parasites (RH strain) and the infection was evaluated
by transmission electron microscopy. Tachyzoites were found inside 3T3 cells, assuring that the spheroid can be a
suitable culture substrate to T. gondii in vitro propagation. A three-dimensional methodology for in vitro cultivation of
the parasite is perhaps the key for applications in the study of toxoplasmosis, as it has a fast, cheap, efficient
production (yield and reduction of contamination).
Palavras-Chave:
protozoa;
nanoparticles;
fibroblasts;
cell proliferation;
in vitro
NASCIMENTO, ANA C.G.; GALISTEO JUNIOR, ANDRES J.; SILVA, GIOVANA D. da; ROCHA, LEONARDO W.P. de S.; VIEIRA, DANIEL P.
Effective methodology for maintaining Toxoplasma gondii in vitro using paramagnetic iron nanoparticles to support three-dimensional cell culture.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 377-377.
Disponível em: http://repositorio.ipen.br/handle/123456789/32875. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
SEPULVEDA, ANDERSON F.; FRANCO, MARGARETH
; YOKAICHIYA, FABIANO; ARAUJO, DANIELE de.
POLYana: a new software for rheological study of polymeric colloidal materials.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 374-374.
Abstract:
POLYAna is a new executable software developed by SISLIBIO group for rheological analysis of hydrogel and
organogel systems and other colloidal materials (nanoparticles and micelles). The software development aims to
facilitate the analysis of rheology data associated to both temperature- and frequency-dependent analysis, viscosity
and curve flow profiles. The software development aims to facilitate the analysis of rheology data associated to both
temperature- and frequency-dependent analysis, viscosity and curve flow profiles. From raw data, several models
are applied like power-law model for frequency response and curve flow, Boltzmann law to calculate gelation
temperature and viscosity response under temperature, Maxwell model to study interchain relationships in addition
to other models such as Bingham model, Cross model, and Herschel-Bulkley are also available. POLYana outputs
calculates rheological parameters like consistency, adhesion, hysteresis, flow index, G’/G’’ ratio. To validate results
obtained from POLYana, same data were analyzed by applying other programs and same mathematical models. In
this sense, rheological analysis of Poloxamer 407 in water solution (15 %) were performed: from temperature-dependent
G’ and G’’ analysis were obtained gelation temperature of 45.46 ± 0.02 °C, η_0 = 0.08 ± 0.03 mPa*s,
η_max = (32.44 ± 0.17) mPa*s and dη/dT = (1.27 ± 0.02) mPa*s/°C by fitting Boltzmann law (R2 = 0.998), which are
similar to results obtained by others softwares and found in literature. From temperature-dependent G’ and G’’
analysis, it gets adhesion value of (1647.15 ± 18.01) mPa*sn calculated from power-law model (R2 = 0.869), also
similar to PRISM results. Also, other Poloxamer concentrations and hydrogels types have been evaluated, showing
close numbers to that previously reported. In order to stablish structural relationships, one of POLYana tools is also
to analyze small-angle neutron scattering (SANS) and develop Monte Carlo simulation for SANS and rheological
analysis, simultaneously.
Palavras-Chave:
programming;
data analysis;
rheology;
micellar systems;
colloids
SEPULVEDA, ANDERSON F.; FRANCO, MARGARETH; YOKAICHIYA, FABIANO; ARAUJO, DANIELE de.
POLYana: a new software for rheological study of polymeric colloidal materials.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 374-374.
Disponível em: http://repositorio.ipen.br/handle/123456789/32874. Acesso em: $DATA.
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SILVA, CAMILA R.
; PINTO, MAYARA S.
; RIBEIRO, MARTHA S.
.
Photodynamic therapy associated with ionizing radiation in the treatment of triple-negative breast cancer cells.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 258-258.
Abstract:
Breast cancer is the most common cancer for women worldwide. According to the World Health Organization, it is
considered the 5 th leading cause of death from cancer. Triple-negative breast cancer (TNBC) is a subtype of this
disease that represents around 20% of all invasive breast cancer, whose main characteristics are resistance to
conventional treatments, such as exposure to ionizing radiation (IR). On the order hand, the photodynamic therapy
(PDT) using porphyrins and their derivatives has been described in the literature as a potential therapy against
cancer. Thus, our goal in this work was to associate PDT and IR in the treatment of TNBC. MDA-MB-231 cells at a
concentration of 2x104 cells were submitted to PDT using TMPyP porphyrin (30 μM) and a red light (660 ±11 nm)
with fluences of the 23 and 57.5 J/cm 2 (57.3 mW/cm 2). Immediately post-PDT, cells were divided into groups: non-treated
(control), only IR and PDT associated with IR (PDT57+IR and PDT23+IR) and then, exposed to IR with a
dose of 2.5 Gy. Past 24-h of the PDT-session, the cell viability, clonogenicity and total glutathione were verified. Cells
exposed to IR not presented statistically significance difference compared to the control group. However, treated
groups showed around 38% lower cell viability in relation to the control and IR groups. For the clonogenic assay a
reduction of the approximately 65% was observed between IR and treated groups. Regarding to the total glutathione,
all groups showed an increase when compared to control group. Nonetheless, no were identified differences between
IR and treated groups. Taken together, our results indicate that PDT associate with IR may be an ally in TNBC
treatment.
Palavras-Chave:
neoplasms;
mammary glands;
therapy;
radiotherapy;
combined therapy
SILVA, CAMILA R.; PINTO, MAYARA S.; RIBEIRO, MARTHA S.
Photodynamic therapy associated with ionizing radiation in the treatment of triple-negative breast cancer cells.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 258-258.
Disponível em: http://repositorio.ipen.br/handle/123456789/32873. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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PINTO, MAYARA S.
; SILVA, CAMILA R.
; SALVEGO, CAMILA de A.
; RIBEIRO, MARTHA S.
.
Red LED irradiation impacts the cytotoxic response of murine breast cancer cells to ionizing radiation.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 256-256.
Abstract:
Breast cancer is a disease of worldwide importance since it is considered the 5th leading cause of cancer deaths.
Triple-negative breast cancer (TNBC) is a molecular subtype that presents resistance to conventional radiotherapy,
demanding high doses of ionizing radiation (IR) for a prolonged period of treatment. On the other hand, low-level light
irradiation (LLLI) has been studied to sensitize cells before IR exposure. However, the literature is poor regarding the
association of both techniques in TNBC cells. Thus, we aimed to assess the effect of LLLI before IR exposure on two
TNBC cell lineages. MDA-MB-231 (human TNBC) and 4T1 (murine TNBC) were cultivated, seeded at a density of
2.5 x 105 cells/cm², and maintained in an incubator (37ºC, 5% of CO2) overnight. LLLI was performed with a red LED
(λ= 660 ± 11 nm, 38.2 mW/cm²) delivering energies of 1.2 J and 6.0 J. One-h after LLLI, the cells were submitted to
both 2.5 and 5.0 Gy doses from a 60CO source. After 24-h, mitochondrial activity (MA) was quantified by MTT assay
with n= 9/group. Our data showed that 4T1 cells exposed to LLLI at 1.2 J exhibited higher MA than cells exposed to
IR2.5. In contrast, cells exposed to 6 J of LLLI showed lower MA than IR5. Concerning MDA-MB231 cells, no
statistically significant differences were noticed among groups regardless of IR and LLLI doses. These findings
indicate that LLLI before IR could sensitize only murine breast cancer. Besides, an appropriate combination of IR and
LLLI doses seems to play a role to kill TNBC cells.
Palavras-Chave:
radiotherapy;
radiobiology;
photochemistry;
toxicity
PINTO, MAYARA S.; SILVA, CAMILA R.; SALVEGO, CAMILA de A.; RIBEIRO, MARTHA S.
Red LED irradiation impacts the cytotoxic response of murine breast cancer cells to ionizing radiation.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 256-256.
Disponível em: http://repositorio.ipen.br/handle/123456789/32872. Acesso em: $DATA.
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SOUZA, MARESSA D.F. de
; ITRI, ROSANGELA; RIBEIRO, MARTHA S.
.
Reconstitution of Leishmania plasma membrane to understand the photodynamic effect.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 255-255.
Abstract:
Leishmaniasis is an important neglected disease. Photodynamic therapy (PDT) has been used to fight cutaneous
leishmaniasis showing good results. However, PDT mechanisms in Leishmania parasites are not yet completely
clarified. In this work, our objective was to develop a protocol to produce giant plasma membrane vesicles (GPMVs)
from Leishmania amazonensis promastigotes to understand the mechanisms of action of methylene blue (MB)-
mediated PDT on the cell membrane of parasites. For membrane extraction, several techniques were tested. The
osmotic shock was the technique that presented the best yield and effectiveness. Phosphate and protein
measurements were performed to confirm membrane extraction. For the growth of GPMVs, the best technique was
electroforming using different frequencies and voltages in 4 cycles. Reconstituted GPMVs were observed by phasecontrast
light microscopy. Subsequently, PDT was applied to GPMVs dispersed in an aqueous solution containing
50 μM MB and we verified the changes in permeability before and after exposure to light. The same process was
applied to giant unilamellar vesicles (GUVs) with lipid compositions similar to the parasite membrane. The
electroforming technique with the protocol developed in this work made it possible to obtain GPMVs from a
promastigote membrane isolate of L. amazonensis. The membrane isolation technique was effective to extract the
parasite's membrane while preserving lipids and proteins. In GUVs we observe an increase in the area during PDT
in different compositions and loss of contrast. The GPMVs showed a loss of contrast as well as the GUVs but did not
show an increase in area. This factor could be explained by the high degree of complexity of the membrane, which
contains membrane proteins in addition to containing lipids.
Palavras-Chave:
therapy;
photodynamic therapy;
protozoa;
parasitic diseases;
cell membranes
SOUZA, MARESSA D.F. de; ITRI, ROSANGELA; RIBEIRO, MARTHA S.
Reconstitution of Leishmania plasma membrane to understand the photodynamic effect.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 255-255.
Disponível em: http://repositorio.ipen.br/handle/123456789/32871. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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SOUZA, TIAGO H. dos S.; ANDRADE, CAMILA; CABRAL, FERNANDA
; SARMENTO-NETO, JOSE; REBOUCAS, JULIO; SANTOS, BEATE; RIBEIRO, MARTHA
; FIGUEIREDO, REGINA; FONTES, ADRIANA.
Effects of photodynamic inactivation mediated by Zn(II) porphyrin on promastigote and amastigote forms of Leishmania amazonensis.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 250-250.
Abstract:
Photodynamic inactivation (PDI) has been attracting attention as an innovative technology to treat topical diseases,
such as cutaneous leishmaniasis (CL) and infections caused by multidrug-resistant microorganisms. Zn(II) mesotetrakis(
N-n-hexylpyridinium-2-yl)porphyrin (ZnTnHex-2-PyP4+) is a lipophilic water-soluble Zn(II) porphyrin with
improved photophysical properties, high chemical stability, and cationic/amphiphilic character that can enhance its
interaction with cells. Thus, this study aimed to investigate the PDI effects mediated by ZnTnHex-2-PyP4+ on
Leishmania amazonensis. Confocal fluorescence microscopy was explored to study the interaction of ZnTnHex-2-
PyP4+ with promastigotes. The PDI action was analyzed by cell membrane integrity, mitochondrial membrane
potential (ΔΨm), and cell morphology. Promastigotes were incubated with ZnTnHex-2-PyP4+ for 5 min at 0.62 and
1.25 μM and irradiated by a LED (410 nm) for 1 or 3 min (2.3 and 3.4 J/cm2, respectively). PDI on amastigotes and
the cytotoxicity on macrophages were also analyzed (3.4 J/cm2). Fluorescence microscopy revealed that parasites
efficiently uptake ZnTnHex-2-PyP4+ and displayed a punctate labeling pattern along with the cytoplasm. An intense
ΔΨm depolarization was also observed, which in association with microscopy results, suggests that ZnTnHex-2-
PyP4+ may accumulate in the mitochondrion, or other well-defined structures close to it. Moreover, ZnTnHex-2-PyP4+
at concentration as low as 0.62 μM led to the immediate inactivation of >95% of promastigotes, regardless of the light
dose used. Loss of the fusiform shape and plasma membrane wrinkling were also observed. After a single treatment
session in amastigotes, PDI led to a reduction of 70% in the infection index. No considerable toxicity was observed
on mammalian cells. Thus, PDI of Leishmania parasites showed in vitro efficiency at a submicromolar concentration
of ZnTnHex-2-PyP4+, with short pre-incubation and irradiation times. The results encourage further studies in CL pre-clinical
assays and PDI of other microorganisms.
Palavras-Chave:
inactivation;
skin diseases;
porphyrins;
mitochondria;
cell membranes
SOUZA, TIAGO H. dos S.; ANDRADE, CAMILA; CABRAL, FERNANDA; SARMENTO-NETO, JOSE; REBOUCAS, JULIO; SANTOS, BEATE; RIBEIRO, MARTHA; FIGUEIREDO, REGINA; FONTES, ADRIANA.
Effects of photodynamic inactivation mediated by Zn(II) porphyrin on promastigote and amastigote forms of Leishmania amazonensis.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 250-250.
Disponível em: http://repositorio.ipen.br/handle/123456789/32870. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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CONTATORI, CAROLINA G. de S.
; PINTO, MAYARA S.
; RIBEIRO, MARTHA S.
.
Melanoma cell migration in response to red and near-infrared low-level light.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 249-249.
Abstract:
Cell migration plays an important role in tissue formation and cancer progression. In vitro scratch assay has been
used for many years to study cell migration to mimic the migration of in vivo cells, and, thus, to evaluate cancer
growth. Low-level red and near-infrared light (LLL) can increase normal cell migration. However, the impact of LLL
on tumor cells remains unclear. In this work, we aimed to evaluate the effects of a single LLL dose on melanoma cell
migration. B16F10 (murine melanoma) cells were cultivated in RPMI medium with 10% of fetal bovine serum until
they reached 80% confluency. The cell line was seeded in a 6-well plate at a density of 2x10 5 cells/well in triplicate
at two different moments. A wound scratch was performed to disrupt the confluent cell monolayer with a 10 μL pipette
tip. Immediately after the injury, the cells were submitted to the LLL at two distinct wavelengths (660 and 780 nm)
provided by a LED and a laser, respectively, delivering 3 different energies (1.3, 3.6, and 6 J) at an irradiance of 4.2
mW/cm2. The control group was not irradiated. Cells were photographed immediately and at 3, 12, 24, and 36 h after
the scratch. The wound closure was measured using ImageJ software. To evaluate the overall migration, we
calculated the areas under the curve for each group. Cells exposed to the red laser at 6 J migrated slower than
control. In contrast, LLL at 780 nm promoted faster cell migration when irradiated with 3.6 J. These results suggest
that low-level LEDs at 660 nm could prevent melanoma progression in higher energies. However, 780 nm should be
avoided at middle energies.
Palavras-Chave:
melanomas;
modulation;
infrared radiation;
light sources;
cell proliferation;
migration;
in vitro
CONTATORI, CAROLINA G. de S.; PINTO, MAYARA S.; RIBEIRO, MARTHA S.
Melanoma cell migration in response to red and near-infrared low-level light.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 249-249.
Disponível em: http://repositorio.ipen.br/handle/123456789/32869. Acesso em: $DATA.
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MITSUTAKE, HERY; SOUZA, ALESSANDRO D. de; YOKAICHIYA, FABIANO; FRANCO, MARGARETH K.K.D.
; CLEMENS, DANIEL; KENT, BEN; BREITKREITZ, MARCIA C.; RIBEIRO, LIGIA N. de M.; PAULA, ENEIDA de; BORDALLO, HELOISA N..
Evaluation of structural changes of benzocaine-loaded, optimized nanostructured lipid carriers using SANS and Raman imaging approaches.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 183-183.
Abstract:
Local anesthetics are substances that reversibly block the nerve-impulse conduction, alleviating pain without loss of
consciousness. Benzocaine, a poorly soluble local anesthetic, is an ester of para-aminobenzoic acid. Several
strategies of formulations can be used to improve bioavailability and decrease adverse effects of benzocaine. In this
study nanostructured lipid carriers (NLC) were employed. These lipid-based drug delivery carriers have a lipid core
composed of a blend of solid and liquid lipids, and a shelf of non-ionic surfactant. The main aim of this work was to
optimize benzocaine-loaded NLC and to investigate structural changes in these nanoparticles, under different
temperatures. The ratio of excipients (cetyl palmitate, Capmul® PG-8 NF and Pluronic®F68) and benzocaine in the
NLC was optimized using a 2 3 factorial design with respect to the following parameters: particle size, polydispersity
index (PDI) and zeta potentials. The interactions between the factors were found relevant to determine particle size
and PDI. Using desirability function, the best formulation conditions were found. Structural changes in optimized NLC
were observed with Small-Angle Neutron Scattering (SANS) and Raman imaging, in samples at 27, 37 and 40º C.
SANS pointed the formation of lamellar structures inside the NLC, which interlamellar distances increase at higher
temperature. Raman imaging showed that the incorporation of P68 and benzocaine in-between the lipids increased
at higher temperatures, explaining the changes in Q values (SANS). This work shows how different scattering
techniques can provide complementary information and be used together to characterize and understand the
physical, chemical, and structural changes on the organization of pharmaceutical carriers in drug delivery system.
Palavras-Chave:
drugs;
pharmacology;
anesthetics;
drug delivery;
design;
raman spectra
MITSUTAKE, HERY; SOUZA, ALESSANDRO D. de; YOKAICHIYA, FABIANO; FRANCO, MARGARETH K.K.D.; CLEMENS, DANIEL; KENT, BEN; BREITKREITZ, MARCIA C.; RIBEIRO, LIGIA N. de M.; PAULA, ENEIDA de; BORDALLO, HELOISA N.
Evaluation of structural changes of benzocaine-loaded, optimized nanostructured lipid carriers using SANS and Raman imaging approaches.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 183-183.
Disponível em: http://repositorio.ipen.br/handle/123456789/32868. Acesso em: $DATA.
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SANTOS, CAROLINA M. dos
; SAMPAIO, SUELEN de B.; SANTANA, FAGNER
; LEITE, RODRIGO C.
; PRATA, BEATRIZ A.
; AFFONSO, REGINA
.
A new approach for purification of the catalytic site of the Angiotensin Conversion Enzyme, N domain, mediated by the ELP-Inten system.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 143-143.
Abstract:
Angiotensin-converting enzyme I, ACE, is a key part of the renin-angiotensin system whose main function is to
regulate blood pressure and balance of salts in the body. ACE1 has two isoforms, somatic, sACE, and testicular,
tACE. sACE possesses two domains, N- C-, with catalytic sites which exhibit 60% sequence identity. These domains
differ in terms of chloride-ion activation profiles, rates of peptide hydrolysis and sensitivities to various inhibitors. N-domain
has specific action in the hydrolyze of Alzheimer’s diseases beta amyloid bodies and angiotensin 1-7, which
active the MAS receptor and triggering anti-thrombotic and anti-inflammatory actions. The objective this work was to
obtain catalytic site Ala361 to Gli468 of the N-domain region, csACEN, isolation without chromatographic and
denaturant chemical process. For that, a new methodology was used in the expression of the csACEN peptide, in
which the peptide was linked to the elastin-like polypeptide, ELP, and Intein, and expressed at 37C. The
characterization of catalytic site was made by SDS-PAGE and dot blotting. The culture temperature at 37C
significantly increased the expression of the ELP/Intein/csACEN fusion protein. This culture was lysed at a low
temperature allowing the fusion protein to become soluble. The precipitation of ELP at high concentrations of
ammonium sulfate were obtained in 0.57 M and 0.8 M. Intein autocleavage occurs at acidic pH and it is important to
pay attention to: pI 6.65 for csACEN and pI 6.87 for ELPcsACEN, which are very low. The best autocleavage
efficiency was with MES and TriHCl buffers, pH 6.3 and 6.8, respectively, in which pure csACEn peptide was
obtained. The strategy used to obtain the Ala361 to Gli468 catalytic site in soluble and pure form was obtained with
success and the protocol for obtaining similar peptides was established.
Palavras-Chave:
angiotensin;
enzymes;
inflammation;
thrombosis;
temperature dependence
SANTOS, CAROLINA M. dos; SAMPAIO, SUELEN de B.; SANTANA, FAGNER; LEITE, RODRIGO C.; PRATA, BEATRIZ A.; AFFONSO, REGINA.
A new approach for purification of the catalytic site of the Angiotensin Conversion Enzyme, N domain, mediated by the ELP-Inten system.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 143-143.
Disponível em: http://repositorio.ipen.br/handle/123456789/32867. Acesso em: $DATA.
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TREMARIN, BEATRIZ; YOKAICHIYA, FABIANO; KELLERMANN, GUINTHER; FRANCO, MARGARETH K.K.D.
; STORSBERG, JOACHIM.
Improvement of the methodological strategies to product functionalizes antibodies using Small Angle Neutron Scattering (SANS).
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 138-138.
Abstract:
Antibodies are used by jawed vertebrates for defense against invading pathogens. Usage of those versatile tools in
a plethora of settings in clinics and biomedical sciences hinges on functionalization strategies that retain native
antibody reactivity. To this date, antibody functionalization is performed by trial and error. We aim to reduce costs by
providing general principles to allow the full spectrum of antibody functionalization by correlating functionalized
antibody reactivity to cognate antigen by small angle neutron scattering, SANS, measurements and mathematical
modeling of antibody and antibody-antigen super-complexes, obtained by titration experiments. For this research we
have used for as antibody pure goat anti rabbit immunoglobulin, and for the antigen, pure Horseradish Peroxidase
Preliminary results show that the systems (antibody and antibody-antigen complexes) do not change in the range of
a temperature related to storage temperature (25º C), body temperature (37º C) and 40º C. These results will give
us the pair distribution function of these systems and the results will be viewed in light of published precedence to
highlight areas where future effort is needed to refine such versatile tools and improve their production. However,
between the antibody and the complexes structure, different conformations were observed. The antibody has a
globular structure with a radius of gyration around 33 Å, and the complexes display an elongated cylindrical shape
with radius of gyration around 63 Å. This study shows how the scattering techniques (SANS) can provide useful
information about the conformation of the antibody and antibody-antigen formation and help to shed light in the
understanding the physical, chemical, and structural changes on the organization of these important antibody
functionalization for the immunological system.
Palavras-Chave:
neutrons;
small angle scattering;
antigen-antibody reactions;
biophysics
TREMARIN, BEATRIZ; YOKAICHIYA, FABIANO; KELLERMANN, GUINTHER; FRANCO, MARGARETH K.K.D.; STORSBERG, JOACHIM.
Improvement of the methodological strategies to product functionalizes antibodies using Small Angle Neutron Scattering (SANS).
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 138-138.
Disponível em: http://repositorio.ipen.br/handle/123456789/32866. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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ZEZELL, DENISE M.
.
Radiation Technology in Health Sciences at IPEN: a multidisciplinary and interdisciplinary Professional Master Degree.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 105-105.
Abstract:
The Professional Master Program in Radiation Technology in Health Sciences (MP-TRCS) of the Nuclear
and Energy Research Institute- IPEN/CNEN is a new program, started in August 2019. It is the only
graduation program in the country to offer two nuclear reactors for educational purposes, for the
development of dissertations, in addition to providing radiopharmaceuticals production in a nuclear
reactor, in linear accelerator for radioisotope production, as well light and lasers applications. In addition
to the infrastructure, the program has multidisciplinary training advisors working in an interdisciplinary
manner who use their vast experience in radiation applied to medicine to guide students in a productive
manner with a high degree of excellence. The MP-TRCS aims to fulfil a growing demand at IPEN/CNEN
from professionals working in hospitals and clinics, using ionizing and non-ionizing radiation. These
students need a more dynamic course directed to the practical professional activities. We have students
from the most diverse areas, such as medical doctors, biomedical doctors working in clinical analyses,
radiotherapy physicists, physiotherapists, dentists specializing in imaging diagnosis and laser, among
others, participating in the front line, who use radiation or assess its impact on their day-to-day routine.
The first students have already begin to present their dissertation. The employability has increased among
students enrolled in the program. These professionals bring their experience to the program, which
together with IPEN's academic structure and advisors, result in skilled students who are finding numerous
career opportunities in the job market.
ZEZELL, DENISE M.
Radiation Technology in Health Sciences at IPEN: a multidisciplinary and interdisciplinary Professional Master Degree.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 105-105.
Disponível em: http://repositorio.ipen.br/handle/123456789/32865. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
VIEIRA, DANIEL P.
.
Three-dimensional cellular culture system for testing of biological effects of radiations in tumoral and non-tumoral models.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 89-89.
Abstract:
In vitro cell cultures are a well-known controlled test system used to analyze tumor physiologic responses
upon negative stimuli. Updated techniques, us-ing three-dimensional organization of cells in cultures, are
being increasingly used to this purpose. Research organizations and industry are striving to pro-duce in
vitro tumor surrogates that could be better test systems to antitumor agents as new compounds or to
study radiation effects on cancers. The presentation will show some techniques currently used to build
and maintain these specific cell cultures, and how experiments are evolving towards the production of
tumoroids, or tumoral organoids, which will include various cell types and additive manufacturing.
VIEIRA, DANIEL P.
Three-dimensional cellular culture system for testing of biological effects of radiations in tumoral and non-tumoral models.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 89-89.
Disponível em: http://repositorio.ipen.br/handle/123456789/32864. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
DEL MASTRO, NELIDA L.
; GERVASONI, J.L..
Women in the nuclear field promoting Latin American integration.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 84-84.
Abstract:
Nuclear energy is used for the generation of electricity, but also for the production of radioisotopes,
desalination of sea water and also for the production of hydrogen. Activities in the nuclear field are in the
area of science, technology and innovation that has long belonged to an essentially male domain, in which
the contributions of women were neglected or underestimated. The central idea for the creation of Women
in Nuclear, WiN Global, was to support and encourage women working in nuclear science and technology
and encourage the promotion of understanding and knowledge of the benefits of the peaceful use of
nuclear energy by the public. WiN Global currently has predominantly female members coming from 129
different countries, belonging to chapters or individually. Today, WiN Global is integrated by 53 WiN
Global chapters. Forty-nine countries have their own chapters and there are also regional and
international ones. The history of Latin American integration started during the political independence
movement of the countries of the New Continent. Since then, up and downs were overcome in order to
keep a regional ambiance of good relationship. In the present study, a new form of integration is presented
by the efforts of the women working in the nuclear ambit. This important movement involves Latin
American WiN chapters (such as WiN Argentina, WiN Brazil, WiN ARCAL) promoting activities for the
integration of our region. In order to quantify, to some extent, the participation of Latin American women,
this paper presents a survey crossing data of the number of related publications to help to address an
objective analysis of the trend of this integration.
DEL MASTRO, NELIDA L.; GERVASONI, J.L.
Women in the nuclear field promoting Latin American integration.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 84-84.
Disponível em: http://repositorio.ipen.br/handle/123456789/32863. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
VALLE, MATHEUS del
; SANTOS, MOISES O. dos
.
Breast tissue diagnosis using artificial intelligence applied to FTIR spectroscopy images.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 42-42.
Abstract:
The estimative of new breast cancer cases was of 2.1 million of new breast cancer cases in 2018, hence
being the most incident type of cancer in women. The improvement of its diagnosis has been the aim of
many researchers, including vibrational spectroscopy teams. With the advancement of the artificial
intelligence, a field of computer science to enhance intelligence into computer systems, specially of the
deep learning, big data acquired from spectroscopy image has entered a new era. Therefore, the proposal
of this work was to diagnose breast tissue samples as malignant (cancer) or benign (adenosis) using
deep learning techniques. Micro-FTIR spectroscopy images were acquired from BR804b human breast
tissue microarray (Biomax, USA), resulting in more than 100 thousand spectra for each group. A k-means
approach was established to separate spectra into three clusters: tissue, paraffin and slide. A
preprocessing step was applied by the following pipeline: outlier removal; biofingerprint truncation;
Savitzky–Golay filter to smooth and to obtain the second derivative; extended multiplicative signal
correction to correct spectra and remove the paraffin contribution. The deep learning algorithm was built
using two-layers of one-dimensional convolutional neural network (CNN) connected to a two-layers (100
and 50 neurons) feedforward network (FFN). Both networks used dropout layers of 50% and rectified
linear unit activations. CNN kernel size was set to 5. The output neuron used a sigmoid activation. Adam
optimizer was applied to train the networks, using a binary cross-entropy loss to improve the weights. A
4-fold cross-validation of 20 epochs and batch size of 250 was performed. The networks exhibited an
accuracy of (97.8 ± 0.4)% during the training stage, and (96.9 ± 0.8)% during the testing stage,
demonstrating a generalized classification. Accuracies of almost 100% indicates this approach as a
potential technique for the breast diagnosis.
VALLE, MATHEUS del; SANTOS, MOISES O. dos.
Breast tissue diagnosis using artificial intelligence applied to FTIR spectroscopy images.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 42-42.
Disponível em: http://repositorio.ipen.br/handle/123456789/32862. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
YOSHIMURA, TANIA M.
; SAUTER, ISMAEL P.
; RIBEIRO, MARTHA S.
.
Low power light triggers opposite effects on stem cells: influence of the wavelength and culture conditions.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 41-41.
Abstract:
Photobiomodulation (PBM) has been gaining importance in a wide range of medical fields in the past few
years, particularly in stem cell-based regenerative medicine. Improving in vitro cell proliferation,
differentiation and viability are ways where PBM could play a pivotal role optimizing biotechnological and
bioengineering applications. Here we investigated whether different wavelengths (blue, green and red)
would promote distinct outcomes in human adipose-derived stem cells (hADSCs) cultured in regular and
supplemented media for tenocyte differentiation. MATERIALS AND METHODS. Freshly isolated hADSCs
were cultured in a specific stem cell medium (MSCGM, Lonza), DMEM or a tenogenic medium (TEN-M:
DMEM supplemented with growth factors and ascorbic acid). Cells were irradiated every 48 h (23.28
mW/cm 2, 17 min 10 s delivering 24 J/cm 2 per session) using a LED irradiator (LEDbox, BioLambda).
MTT and crystal violet assays were used to evaluate cell metabolic activity and proliferation. Red
wavelength (660 nm) significantly increased metabolic activity after five irradiations, but only for cells
cultured in TEN-M. Oppositely, blue (450 nm) and green (520 nm) light decreased both cell proliferation
and metabolic rate, with more pronounced effects for blue light in TEN-M. Considering these findings, we
examined whether irradiating only the media would generate toxic compounds that could impair cell
viability. We therefore assessed reactive oxygen species (ROS) production by p-nitrosodimethylaniline/
histidine assay while irradiating the three different media under the same conditions
as mentioned above. Immediately after blue and green light exposure, an increment in ROS production
was observed for DMEM and TEN-M, that continuously increased until reaching between 4.5 and 7.1 μM
one-hour after irradiation – with higher values for TEN-M exposed to blue light. Since no significant ROS
formation was observed following red light exposure, we concluded that medium composition was
responsible for the different effects on metabolic activity and proliferation observed after irradiation with
different wavelengths.
YOSHIMURA, TANIA M.; SAUTER, ISMAEL P.; RIBEIRO, MARTHA S.
Low power light triggers opposite effects on stem cells: influence of the wavelength and culture conditions.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 41-41.
Disponível em: http://repositorio.ipen.br/handle/123456789/32861. Acesso em: $DATA.
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-
RIBEIRO, MARTHA S.
.
Light-based non-thermal therapy: from basis to clinical applications.
In: CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 39-39.
Abstract:
Light-based non-thermal therapies are evolving as promising non-invasive and cost-effective medical
technologies. These therapeutic platforms mainly encompass photobiomodulation (PBM) and
photodynamic therapy (PDT), which use visible or near infrared (NIR) light to induce biological responses
without any significant heating effects. For PBM, it is most commonly used red or NIR light to optimize
light penetration into biological tissues. The photon absorption by natural chromophores at these spectral
regions cause photophysical and photochemical reactions inside cells that trigger several biological
effects such as to accelerate wound healing, reduce inflammation and relief pain, depending on light
parameters and target tissue. On the other hand, PDT makes use of photoactivated drugs, also called as
photosensitizers, which absorb light to induce chemical reactions that kill microbial or cancer cells by
oxidative stress. Our group have been investigating the mechanisms and several applications of PBM
and antimicrobial PDT (APDT) for almost 20 years. In this lecture I will share our experience in the area
to discuss how PBM and APDT could be used to revolutionize health care in the photonics era. An
integrated perspective from the basic mechanisms, preclinical and clinical trials for both therapies will be
presented, including PBM on cancer management and APDT against drug-resistant pathogens. The
lecture will also highlight future perspectives.
RIBEIRO, MARTHA S.
Light-based non-thermal therapy: from basis to clinical applications.
In:
CONGRESS OF THE INTERNATIONAL UNION FOR PURE APPLIED BIOPHYSICS, 20th; ANNUAL MEETING OF THE BRAZILIAN SOCIETY FOR BIOCHEMISTRY AND MOLECULAR BIOLOGY, 50th; CONGRESS OF BRAZILIAN BIOPHYSICS SOCIETY, 45th; BRAZILIAN SOCIETY ON NUCLEAR BIOSCIENCES CONGRESS, 13th,
October 4-8, 2021,
São Paulo, SP.
Abstract...
São Paulo, SP: Sociedade Brasileira de Bioquímica e Biologia Molecular (SBBq),
2021.
p. 39-39.
Disponível em: http://repositorio.ipen.br/handle/123456789/32860. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
FREIRE, LUCIANO O.
; ANDRADE, DELVONEI A. de
.
Some facts about nuclear forces and evidence of their range being longer than people believe.
In: INTERNATIONAL CONFERENCE ON CONDENSED MATTER NUCLEAR SCIENCE, 23rd,
June 9-11, 2021,
Online.
Abstract...
2021.
Abstract:
Nuclear forces are believed to have ranges around 2 fermi and beyond that range, only electrostatic force is relevant. Before trying to make theories about the phenomena of nuclear reactions observed in solids, it is important to revise critically the existing experimental literature and nuclear theory to check if current models are coherent and if they could explain the observed phenomena. The first step is to check the current nuclear models, the second is to analyse the neutron cross-section data, the third is to discuss coherence between empirical data and models, the fourth is to identify the order of magnitude of nuclear forces range, the fifth is to revise the full height of Coulomb barrier. It was found one isotope (Gadolinium-157) that can attract a thermal neutron at least at 2781 fermi and repulses neutrons at 179 Fermi. It was also found that the plane projection of volumes where neutrons are directly captured is distinct of the projection of the volume where neutrons are scattered for most isotopes. But Kryptonium, Ruthenium, Xenonium, Iridium, and Mercury elements seem having their scattering volumes covered by the absorption volumes, or not having a scattering volume at all. Ca-44, Ca-48, Ni-64, Se-74, Te-123, Dy-162, Hf-177 and W-186 isotopes seem having a partial screening of their scattering volume by the absorption volume. Resonance capture volumes seem to be independent of direct capture volumes and have interface with scattering volume. Three facts suggest absorption volumes are consequence of nucleons arrangement, assuming an FCC nucleus model. The first is that a single additional neutron may change the order of magnitude of absorption radius (like He-3 to He-4). Second, excited states also change absorption cross-sections, like Na-23 whose first excited state increases absorption cross-section and Cl-37 whose first excited state decreases absorption cross-section. Third, neutron capture resonance depends on existence of an excited state of the compound nucleus (target nucleus plus the neutron) with energy larger than this neutron binding energy. In other words, to have a resonance, the target nucleus needs to have two places available for a neutron, and the energetic distance between them needs to be larger than a minimum (the very neutron binding energy). Compared to Coulomb forces, the nuclear forces attracting neutrons are weak, about 6 orders of magnitude smaller than electrostatic repulsion at mean thermal neutron capture radius.
FREIRE, LUCIANO O.; ANDRADE, DELVONEI A. de.
Some facts about nuclear forces and evidence of their range being longer than people believe.
In:
INTERNATIONAL CONFERENCE ON CONDENSED MATTER NUCLEAR SCIENCE, 23rd,
June 9-11, 2021,
Online.
Abstract...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32856. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
FREIRE, LUCIANO O.
; ANDRADE, DELVONEI A. de
.
A survey on the evolution of yearly works on Pd-D, Ti-D and Ni-H systems within cold fusion field.
In: INTERNATIONAL CONFERENCE ON CONDENSED MATTER NUCLEAR SCIENCE, 23rd,
June 9-11, 2021,
Online.
Abstract...
2021.
Abstract:
More than 30 years have been passed since Stanley and Pons press conference announcing the discovery of “Cold Fusion”. This work aims at presenting a general view of the evolution of experimental works in the various sub-fields, like Pd-D, Ti-D, Ni-H systems. For each subfield, this work presents the yearly number of successful and unsuccessful works published in conferences or journals. For Pd-D systems, since 1989, the number of positive results (finding some nuclear reactions) is superior to negative results but there is a trend of reduction of yearly works. Ti-D systems follow the same tendency. Ni-H systems, on the other hand, present a rising tendency besides having a higher ratio of successful/unsuccessful experiments. Perhaps the smaller cost of materials and easier replication is being decisive for new research groups starting in the field, besides enterprises starting advertisement of products based on the Ni-H system.
FREIRE, LUCIANO O.; ANDRADE, DELVONEI A. de.
A survey on the evolution of yearly works on Pd-D, Ti-D and Ni-H systems within cold fusion field.
In:
INTERNATIONAL CONFERENCE ON CONDENSED MATTER NUCLEAR SCIENCE, 23rd,
June 9-11, 2021,
Online.
Abstract...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32855. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
FREIRE, LUCIANO O.
; ANDRADE, DELVONEI A. de
.
A hypothesis of kinetics and dynamic control of nuclear reactions in solids.
In: INTERNATIONAL CONFERENCE ON CONDENSED MATTER NUCLEAR SCIENCE, 23rd,
June 9-11, 2021,
Online.
Abstract...
2021.
Abstract:
Several authors suggested that background noise could influence nuclear reactions in solids, resulting in neutrons or excess heat. Literature shows that repeatability is improving, but the control over the intensity remains out of reach. This work aims at identifying possible causes for intensity variations and proposing solutions to improve controllability. The first step is to search in literature the characteristics of nuclear reactions in solids: input, output, controlling factors and enabling means. The second step is, from solid experimental facts, draw solid conclusions. The third step is developing some assumptions about the phenomenon. For each controlling factor, verify the feasibility of implementation in a heat exchanger with high surface over volume ratio. Finally, present some alternatives of architectures to improve reactions intensity control. A solid conclusion is hot spots come from aneutronic nuclear chain reactions, meaning each energetic charged particle causes the appearance of more than one new charged particle (effective multiplication factor keff>1). Another conclusion is background neutron radiation starts chain reactions and it causes excess heat intensity variations. An assumption is a local keff>1 causes micro explosions terminating the localized reactions because heat propagates faster than the particle population, resulting in low average keff. Therefore, nanoparticles or working temperatures near melting point reduce local keff allowing slow enhancement of particle population up to a level proportional to the background neutrons. A suggestion is to shield the reactors using moderators with neutron absorbers to avoid undesirable power excursions and add a voltage-controlled neutron source to control the excess heat because of the penetrating nature of neutron radiation. Magnetic or electric fields could also help the enhancement of excess heat.
FREIRE, LUCIANO O.; ANDRADE, DELVONEI A. de.
A hypothesis of kinetics and dynamic control of nuclear reactions in solids.
In:
INTERNATIONAL CONFERENCE ON CONDENSED MATTER NUCLEAR SCIENCE, 23rd,
June 9-11, 2021,
Online.
Abstract...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32854. Acesso em: $DATA.
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GERAMI, ADELEH M.; SCHELL, JULIANA; CARBONARI, ARTUR
; COSTA, MESSIAS S.; COSTA, CLEIDILANE; VIEJO, CARLOS D.G.; LORENZ, KATHARINA; PIRES, JULIO; MONTEIRO, JOAO; JOHNSTON, KARL; CORREIA, JOAO M..
Density functional theory study of Cd impurities in molybdenum trioxide.
In: ISOLDE WORKSHOP AND USERS MEETING,
December 14-16, 2021,
Online.
Abstract...
2021.
p. 27-28.
Abstract:
Transition metal oxides semiconductors (TMOs) are known for their special optical and electrical
properties with wide-ranging applications, including gas sensing, storage devices such as Li-ion
batteries, solar cells, and catalysts[1,2]. Among different types of TMOs, there is a class of materials
that are distinguished by their unique layered structure and multiple oxidation states, such as MoO3,
WO3, and V2O5. The molybdenum trioxide (MoO3) is known for its photo-, thermo- and electrochromism,
high catalytic activity[3]. The MoO3 has found in different structural phases including
the orthorhombic phase, α-MoO3; monoclinic phase, β-MoO3; metastable phase at high-pressure
conditions, β′-MoO3; and hexagonal phase, h-MoO3[4]. Among them, the α-MoO3 is the most stable crystal phase and it has a layered structure consisting of van der Waals bonded sheets of distorted
edge-sharing Mo−O6 octahedra in which Mo atoms are bounded by three distinct types of oxygen
atoms[5].
In this research, the structural properties and hyperfine parameters of 111mCd(111Cd) impurities
in α-MoO3 are investigated by first-principle calculations in the framework of density functional
theory (DFT). The Perdew–Burke–Ernzerh of generalized gradient approximation (GGA-PBE), and
GGA-PBE plus Hubbard-U corrections for onsite Coulomb interactions are used in the DFT calculations.
In the calculations performed, the effect of van der Waals forces between layers is employed
using the DFT-D3 method[6]. To interpret the experimental results, different configurations around
the Cd atom including the different types of oxygen vacancies are simulated. The comparison of experimental
data with calculated hyperfine parameters indicates that the Cd atom is predominantly
located in the interstitial lattice site of MoO3, and also the oxygen vacancy is most likely to form on
the 2-fold coordinated (O2) atoms.
The results of this work demonstrate the benefit of first-principle calculations for solving the outstanding
questions arising from the experiment.
GERAMI, ADELEH M.; SCHELL, JULIANA; CARBONARI, ARTUR; COSTA, MESSIAS S.; COSTA, CLEIDILANE; VIEJO, CARLOS D.G.; LORENZ, KATHARINA; PIRES, JULIO; MONTEIRO, JOAO; JOHNSTON, KARL; CORREIA, JOAO M.
Density functional theory study of Cd impurities in molybdenum trioxide.
In:
ISOLDE WORKSHOP AND USERS MEETING,
December 14-16, 2021,
Online.
Abstract...
2021.
p. 27-28.
Disponível em: http://repositorio.ipen.br/handle/123456789/32846. Acesso em: $DATA.
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BURIMOVA, ANASTASIA
; LEITE NETO, OSMAR F.
; BOSCH-SANTOS, BRIANNA
; CORREA, EDUARDO L.
; PEREIRA, LUCIANO F.D.
; SALES, TATIANE S.N.
; RIBEIRO JUNIOR, IBERE S.
; COSTA, MESSIAS S.; COSTA, CLEIDILANE; DANG, THANH T.; ZYABKIN, DMITRY; VAN STIPHOUT, KOEN K.F.; GERAMI, ADELEH M.; CORREIA, JOAO M.; SCHELL, JULIANA; CARBONARI, ARTUR W.
.
Cd impurities in Vanadium oxides: a hyperfine interaction investigation using 111mCd nuclei.
In: ISOLDE WORKSHOP AND USERS MEETING,
December 14-16, 2021,
Online.
Abstract...
2021.
p. 15-16.
Abstract:
The number of metastable phases, the capriciousness at changing external conditions, and lack of
accurate description of local behavior already resulted in severe misinterpretation of experimental
outcomes for vanadium oxides[1–3]. The scope of already implemented and potential applications
of vanadium oxides is, indeed, impressive, particularly as a battery cathode for energy storage[
4].
Doping is widely exploited as a means of application-oriented tuning of the material properties. The
properties of each particular phase may be tuned by doping to satisfy specific requirements and/or
improve the functional performance. In the work here reported, electric quadrupole interaction on
111mCd nuclei implanted in vanadium pentaoxide doped with different concentrations of Cd were
measured with time-differential perturbed angular correlations (TDPAC).
Pure V2O5 as well as doped with 1%, 5%, and 10% of Cd were measured at different temperatures.
To correlate the results with the possible formation of different phases and compounds, samples
of VO2, CdV2O6, and Cd2V2O7 were also measured. The intention is to provide a comprehensive
description, at an atomic level, of the doping effects on the local crystal structure and the electronic structure around the impurity and the consequences on the properties of the host oxides. Preliminary
results show that the probability of formation of cadmium vanadates is low but the temperature and
atmosphere of measurements have an important effect on the local scale.
BURIMOVA, ANASTASIA; LEITE NETO, OSMAR F.; BOSCH-SANTOS, BRIANNA; CORREA, EDUARDO L.; PEREIRA, LUCIANO F.D.; SALES, TATIANE S.N.; RIBEIRO JUNIOR, IBERE S.; COSTA, MESSIAS S.; COSTA, CLEIDILANE; DANG, THANH T.; ZYABKIN, DMITRY; VAN STIPHOUT, KOEN K.F.; GERAMI, ADELEH M.; CORREIA, JOAO M.; SCHELL, JULIANA; CARBONARI, ARTUR W.
Cd impurities in Vanadium oxides: a hyperfine interaction investigation using 111mCd nuclei.
In:
ISOLDE WORKSHOP AND USERS MEETING,
December 14-16, 2021,
Online.
Abstract...
2021.
p. 15-16.
Disponível em: http://repositorio.ipen.br/handle/123456789/32845. Acesso em: $DATA.
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LINS, C.
; MOREIRA, E.G.
; SOUSA, E.P..
Ecotoxicological quality of Caraguatatuba Bay sediment, São Paulo, Brazil.
In: SOCIETY OF ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY (SETAC) LATIN AMERICA BIENNIAL MEETING, 14th,
September 26-29, 2021,
Online.
Abstract...
Pensacola, FL, USA: Society of Environmental Toxicology and Chemistry (SETAC),
2021.
p. 54-54.
Abstract:
Caraguatatuba Bay (-23.66363, -45.43035), at the northern seashore of São Paulo State, Brazil, is exposed to significant sources of marine pollution: domestic effluents and spills of oil and its derivatives. This is due to its proximity to the São Sebastião Channel, where the submarine emissary outfall takes place and where the largest oil transport terminal in Brazil is located. Due to their hydrodynamic characteristics, pollutants tend to deposit in the sediment, impacting the organisms associated with it. These organisms are of great ecological importance, linked to the basis of the food chain and many species are of nutritional and commercial interest. The region remains an important stronghold of artisanal fishermen and mollusk pickers, which raises concerns about the consumption of these organisms by the local population and tourists. The aim of this study was to evaluate the quality of the bay sediment by means of ecotoxicological tests on sediments collected at six points distributed in the bay, in the 2018 winter and in the 2019 summer. Total sediment acute toxicity tests were performed using the amphipod Leptocheirus plumulosus. Samples that presented different results compared to the control sample were only observed in the winter campaign, in three points: Indaiá and Centro Beaches, according to Dunnett's test (p ≤ 0.05) and Indaiá, Centro and Camaroeiro Beaches, according to the t-test (p ≤ 0.05). Sediment samples of these beaches showed adverse effect to the organisms of the assay, being considered toxic. Sediment samples from Porto Novo, Flexeiras and Palmeiras Beaches in winter and all points in the summer campaign did not cause adverse effects to the organisms and were not considered toxic. The three points which samples were considered toxic are on the beaches located from the center to the northern end of the bay where an inlet is formed. The distribution of points with toxicity follows the pattern of particle deposition and approaches the results of sanitary quality of the region according to CETESB, the São Paulo State Environmental Protection Agency.
LINS, C.; MOREIRA, E.G.; SOUSA, E.P.
Ecotoxicological quality of Caraguatatuba Bay sediment, São Paulo, Brazil.
In:
SOCIETY OF ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY (SETAC) LATIN AMERICA BIENNIAL MEETING, 14th,
September 26-29, 2021,
Online.
Abstract...
Pensacola, FL, USA: Society of Environmental Toxicology and Chemistry (SETAC),
2021.
p. 54-54.
Disponível em: http://repositorio.ipen.br/handle/123456789/32843. Acesso em: $DATA.
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TOMINAGA, F.
; LEO, P.; BORRELY, S.I.
.
Toxicity assessment of acetylsalicylic acid using Saccharomyces cerevisiae.
In: SOCIETY OF ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY (SETAC) LATIN AMERICA BIENNIAL MEETING, 14th,
September 26-29, 2021,
Online.
Abstract...
Pensacola, FL, USA: Society of Environmental Toxicology and Chemistry (SETAC),
2021.
p. 50-50.
Abstract:
Urban and industrial growth has triggered the release of toxic compounds into the environment, causing negative impacts on the population and ecosystems. Among the pollutants, pharmaceuticals have drawn attention due to potential of impacting the environment at ecological relevant concentrations. Aspirin is widely used in human medicine as an analgesic, antipyretic and in actively preventing platelet aggregation, and it is frequently detected in influent samples at relatively high concentrations. The yeast Saccharomyces cerevisiae consists in simple eukaryotic model, widely used for toxicity assessment. The current study aims to evaluate the toxicity of the anti-inflammatory acetylsalicylic acid (aspirin) using viability and conductometric assays. The viability assays were based on the evaluation of the number of viable cells present in a cell suspension after 1 hour exposure, while the conductometric tests were done by monitoring of changes in the specific conductivity of suspensions of S. cerevisiae due to inhibition of fermentation in toxic conditions after 30 minutes of exposure. The viability tests showed no reduction of viability at the evaluated concentrations (up to 100 mg L-1). The conductometric assays demonstrated low sensibility of the yeast to aspirin with EC5030min of 815 mg L-1. The results also indicated that there was no increase in the sensitivity of conductometric assays even at 6 hours of exposure. Furthermore, the acute toxicity data was compared with data obtained from in silico toxicity models (ECOSAR). Toxicity data collated from the software from different trophic levels showed EC5096h, LC5048h and LC96h of 867, 1774 and 777 mg L-1 for green algae, daphnid and fish, respectively, indicating low toxicity of aspirin.
TOMINAGA, F.; LEO, P.; BORRELY, S.I.
Toxicity assessment of acetylsalicylic acid using Saccharomyces cerevisiae.
In:
SOCIETY OF ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY (SETAC) LATIN AMERICA BIENNIAL MEETING, 14th,
September 26-29, 2021,
Online.
Abstract...
Pensacola, FL, USA: Society of Environmental Toxicology and Chemistry (SETAC),
2021.
p. 50-50.
Disponível em: http://repositorio.ipen.br/handle/123456789/32842. Acesso em: $DATA.
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FERREIRA, LUCAS A. dos S.
; MUCCILLO, ELIANA N. dos S.
.
Electrical conductivity and grain growth of 12Ce-TZP.
In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 45-45.
Abstract:
Ceramic materials based on tetragonal zirconia polycrystals (TZP) with yttrium or cerium
oxide have been thoroughly studied for a number of technological applications, due to their
outstanding thermomechanical properties. In this work, tetragonal zirconia polycrystals
containing 12 mol% cerium oxide (12Ce-TZP) were prepared by solid-state reaction using
different sintering methods, to evaluate the influence of the final microstructure on the
electrical conductivity. High purity zirconium oxide and cerium oxide starting chemicals
were weighted in the stoichiometric proportion and ball-milled for 6 h for homogenization.
Cylindrical specimens were prepared by pressing followed by sintering. Sintering
experiments were carried out by the conventional and the two-stage methods. The mean
grain size of specimens sintered by the conventional method achieved approximately 2.4
mm after sintering at 1450 ºC/5 h, whereas those sintered by the two-stage method exhibit
less than 1.5 mm even after 10 h at 1350 ºC, in the second stage of sintering. The electrical
conductivity determined by impedance spectroscopy shows the usual Arrhenius behavior for
both the bulk (or intragrain) and grain boundary (intergrain) conductivities, with activation
energies of ~0.97 (bulk) and 1.25 eV (grain boundary). The grain conductivity of specimens
sintered by different methods does not depend on the grain size. In contrast, the grain
boundary conductivity is higher for specimens sintered by the two-stage method, possibly
due to dissolution of minor impurities located at grain boundaries into the bulk, during the
long holding times of the two-stage method.
FERREIRA, LUCAS A. dos S.; MUCCILLO, ELIANA N. dos S.
Electrical conductivity and grain growth of 12Ce-TZP.
In:
BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 45-45.
Disponível em: http://repositorio.ipen.br/handle/123456789/32841. Acesso em: $DATA.
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SILVA, JOSE T. da
; SOUZA, CARLA D. de
; NOGUEIRA, BEATRIZ R.
; ANGELOCCI, LUCAS V.
; ZEITUNI, CARLOS A.
; ROSTELATO, MARIA E.C.M.
.
Homogeneity evaluation of phosphorus-32 epoxy plaques to be used in the treatment of spinal and intracranial cancer by brachytherapy.
In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 919-919.
Abstract:
In Brachytherapy, radioactive source is positioned close to the tumor. The most important
advantage is that the target region receives most of the dose, protecting the healthy tissues
adjacent to the tumor region. In order to use these sources, a high dosimetric uniformity
must be achieved, so a homogeneous dose delivery can be delivered to the target. In the
present work, the consistency of the epoxy resin plate was evaluated using a methodology
developed in the laboratory for the production of radiotherapy sources at IPEN / CNEN - SP.
Several tests were carried out to determine the best mold for the source manufacture. It
was concluded that polytetrafluoroethylene (PTFE), which is commercially known as teflon,
obtained the best result, due to the ease unmold of the source after the resin curing
process. The epoxy plaques were produced with resin 2220 and catalyst 3154 (Avipol), at a
2:1 mass ratio. To simulate the radioactive material, hydrochloric acid (HCl) equivalent to
5% of the total mass (resin + catalyst) is added. The epoxy resin cured for 24 h at room
temperature. The thickness of the plaques was measured reaching an average value of
0.300 mm ± 0.070. The measurements were made with a micrometer, measuring 10 points
of each plaque. The measures of width and length were not performed, as these parameters
do not influence the uniformity of the dose. In order for the distribution of phosphorus-32
activity to be stipulated, a Monte Carlo Simulation using the MCNP code was performed.
The maximum dose variation along the plaque, considering a totally uniform thickness of
0.300 mm, resulted in <0.5% up to 0.5 cm before the edge. The result of the simulation
shows that with a uniformly thick plaque, the dose distribution trend is homogeneous. Based
on the results, the epoxy polymer plaques are shown to be viable for use in brachytherapy,
and the next step of the work will be the tests with radioactive material.
SILVA, JOSE T. da; SOUZA, CARLA D. de; NOGUEIRA, BEATRIZ R.; ANGELOCCI, LUCAS V.; ZEITUNI, CARLOS A.; ROSTELATO, MARIA E.C.M.
Homogeneity evaluation of phosphorus-32 epoxy plaques to be used in the treatment of spinal and intracranial cancer by brachytherapy.
In:
BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 919-919.
Disponível em: http://repositorio.ipen.br/handle/123456789/32840. Acesso em: $DATA.
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TRINDADE, FABIANE J.; DAMASCENO, SERGIO; OTUBO, LARISSA
; SCHMAL, MARTIN; FLORIO, DANIEL Z. de; FONSECA, FABIO C.
; FERLAUTO, ANDRE S..
Lanthanum doped ceria shaped nanostructures for oxidative coupling of methane.
In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 308-308.
Abstract:
The abundance of natural gas due to the advancements in exploration and extraction
technologies has increased the interest in the direct conversion of methane to C2 molecules
via oxidative coupling of methane (OCM) reactions [1]. The design of catalysts by tailoring
shape and oxygen vacancies has a significant impact on their performance [2]. Within this
context, in this work, the fine-tuning of structural defects of ceria rod-like and cube-like
shaped nanoparticles were performed via La3+ doping (LaxCe1-xO2-x/2) in molar ratios of
x=5-90 mol %. The morphology control was achieved by varying the hydrothermal synthesis
temperature from 110 °C to 180 °C. The characterization of LaxCe1-xO2-1/2 catalysts was
performed by SEM, HRTEM, XRD, and Raman spectroscopy. The catalytic performance of
the new nanomaterials for the OCM reaction was studied at 750 °C with an in-line gas
chromatograph. In the LaxCe1-xO2-x/2 nanorods, the fluorite crystalline structure is essentially
maintained even for x = 0.6. The Raman spectra analysis indicates that the addition of La3+
leads and increases the formation of different amounts of extrinsic and intrinsic oxygen
vacancies. In addition, the catalytic tests for OCM reaction show that the LaxCe1-
xO2-1/2 (x=50%) nanorods catalyst have 25% of CH4 conversion and 48% of selectivity for
C2 products. The concentration of reactive oxygen species in the LaxCe1-xO2-1/2 (x=50%)
nanorods was crucial to improving the conversion rates and selectivity.
TRINDADE, FABIANE J.; DAMASCENO, SERGIO; OTUBO, LARISSA; SCHMAL, MARTIN; FLORIO, DANIEL Z. de; FONSECA, FABIO C.; FERLAUTO, ANDRE S.
Lanthanum doped ceria shaped nanostructures for oxidative coupling of methane.
In:
BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 308-308.
Disponível em: http://repositorio.ipen.br/handle/123456789/32839. Acesso em: $DATA.
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CARVALHO, SABRINA G. de M.
; MUCCILLO, ELIANA N. dos S.
; MUCCILLO, REGINALDO
.
Ionic conductivity of electric field-assisted sintered gadolinia-doped ceria/alkali salts membranes.
In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 299-299.
Abstract:
Ceramic-carbonate dual-phase membranes were prepared according to the usual procedure:
by vacuum impregnation of molten sodium-lithium carbonates (NLC) into sintered porous
ceria-20 mol% gadolinia (20GDC) solid electrolyte cylindrical pellets; and also by flash
sintering samples with 75 wt.% (CeO2: 20 mol% Gd2O3) and 25 wt.% NLC. Sintering was
accomplished by applying 200 V cm-1 to the membrane positioned in a sample holder of a
dilatometer for monitoring thickness shrinkage, limiting the electrical current to 1 A.
Electrochemical impedance spectroscopy measurements were performed in the 5 Hz-13
MHz frequency range from 300ºC to 600ºC in composite ceramic membranes, covering the
solid-to-molten NLC temperature range. Analysis of the impedance diagrams allowed for the
evaluation of the oxide ion and carbon dioxide ion conductivities. The Arrhenius plots
showed the transition from oxide ion conduction (due to the solid electrolyte) to carbonate
ion conduction (due to the molten NLC). The ionic conductivity values of membranes flash
sintered at 420ºC in 2 min were higher than those of conventionally sintered membranes
and similar to reported values of membranes sintered at 690ºC for 2 h.
CARVALHO, SABRINA G. de M.; MUCCILLO, ELIANA N. dos S.; MUCCILLO, REGINALDO.
Ionic conductivity of electric field-assisted sintered gadolinia-doped ceria/alkali salts membranes.
In:
BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 299-299.
Disponível em: http://repositorio.ipen.br/handle/123456789/32838. Acesso em: $DATA.
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DIAZ, JULIO C.C.A.
; MUCCILLO, REGINALDO
.
Impedance spectroscopy analysis of flash sintered zirconia: 8 mol% yttria solid electrolytes with alkali halide addition.
In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 298-298.
Abstract:
Electrical properties of porous ZrO2:8 mol% Y2O3 ceramics with LiF sintering aid were
studied. The specimens were sintered by transient liquid phase formation under the
application at 650ºC of 200 V cm-1 AC electric field for various current density, current
elapsed time, and lithium fluoride content. Low electric current densities coupled with long
application times produced homogeneous specimens. Variations in the electric current
density and current elapsed time allowed to obtain sample densification in the 60%-75%
range. Impedance spectroscopy measurements were carried out to estimate the relative
pore content, evaluating the product of the blocking factor αR (=Rg/(Rg +Rgb), R, g and gb
stand for resistance, grain and grain boundary, respectively) to the frequency factor αf (=
fgb/fg, f is the characteristic frequency), which is proportional to the blocker volume, i.e., the
porosity. A direct correspondence between αR•αf and the apparent porosity, obtained after
determining the apparent density by the Archimedes method, was observed.
DIAZ, JULIO C.C.A.; MUCCILLO, REGINALDO.
Impedance spectroscopy analysis of flash sintered zirconia: 8 mol% yttria solid electrolytes with alkali halide addition.
In:
BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 298-298.
Disponível em: http://repositorio.ipen.br/handle/123456789/32837. Acesso em: $DATA.
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PELOSI, ANDRE G.; SANTOS, SABRINA N.C. dos; DIPOLD, JESSICA
; ANDRADE, MARCELO B. de; HERNANDES, ANTONIO C.; ALMEIDA, JULIANA M.P. de; MENDONCA, CLEBER R..
Investigation of the influence of transition metal ions in niobium-borotellurite glasses through vibrational and nonlinear optical spectroscopy.
In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 176-176.
Abstract:
Tellurite glasses are know as good candidates to photonic devices’ production because they
exhibit third-order nonlinear optical susceptibilities larger than conventional silicate and
borate glasses. In addition, for glass materials such nonlinearity can be increased by adding
transition or heavy metal ions. In this direction, this work analyzed the influence of Ta5+ and
Zr2+ on the physical, structures, and nonlinear optical properties of niobium-borotellurite
(TBN) glasses. The samples were synthesized by the melt-quench technique using a melting
temperature of around 1000 ºC. DSC measurements were performed to obtain the glass
transition temperature. The densities were determined by the Archimedes method. To
analyze the local structure of the samples FTIR and Raman spectroscopies were used . The
spectrum of nonlinear refractive index (n2) for the TBN glass doped with Ta5+ and Zr2+ ions
was measured using the tunable femtosecond Z-scan technique [1]. Such results were
compared with the BGO model, which involves empirical relations between the linear and
nonlinear refractive index. The addition of metal transition ions did not lead to meaningful
changes in the glass transition temperatures (Tg). The formation of non-bridging oxygen and
BO3 units was observed from the structural analysis. The n2 value determined indicates that
the nonlinear optical responses are associated with the glass matrix. The structural changes
caused by the addition of Ta5+ and Zr2+ demonstrated a decrease followed by an increase in
the value of the molar electronic polarization of the samples, respectively.
PELOSI, ANDRE G.; SANTOS, SABRINA N.C. dos; DIPOLD, JESSICA; ANDRADE, MARCELO B. de; HERNANDES, ANTONIO C.; ALMEIDA, JULIANA M.P. de; MENDONCA, CLEBER R.
Investigation of the influence of transition metal ions in niobium-borotellurite glasses through vibrational and nonlinear optical spectroscopy.
In:
BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 176-176.
Disponível em: http://repositorio.ipen.br/handle/123456789/32836. Acesso em: $DATA.
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DENALDI, RAFAEL L.
; MUCCILLO, REGINALDO
.
High temperature percolation of carbonate ions through porous alumina and zirconia-magnesia impregnated with alkali carbonates.
In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 305-305.
Abstract:
Na2CO3-K2CO3 (56-44 wt.%) eutectic composition was vacuum-impregnated into porous Al2O3
(alumina) and to ZrO2: 3 wt.% MgO (magnesium-partially stabilized zirconia, Mg-PSZ) at the
molten eutectic temperature. Porosity was achieved in the two compounds by addition and
thermal removal of the eutectic composition before impregnation. The parallel surfaces of
disk-shaped impregnated compositions were observed in a scanning electron microscope.
The CO3
2- carbonate ion conductivity of the two composite ceramics was measured by
electrochemical impedance spectroscopy in the 5 Hz-13 MHz frequency range from 470ºC to
780ºC. The permeation of the carbonate ions via eutectic composition through the ceramic
membranes was ascertained by the threshold temperatures of the onset of the carbonate ion
percolation: 660ºC and 720ºC for alumina and Mg-PSZ, respectively.
DENALDI, RAFAEL L.; MUCCILLO, REGINALDO.
High temperature percolation of carbonate ions through porous alumina and zirconia-magnesia impregnated with alkali carbonates.
In:
BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 305-305.
Disponível em: http://repositorio.ipen.br/handle/123456789/32835. Acesso em: $DATA.
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SOUZA, JULIANA P. de; SERNA, JILDER D.P.; MORAES, LETICIA P.R. de
; SILVA, JULIO C.M.; ALVES, ODIVALDO C..
Structural and magnetic properties of CeO2 nanomaterials as a function of different morphologies: nanocube, nanowire and nanobelt.
In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 128-128.
Abstract:
The nanomaterials of cerium oxide can be applied in catalysts, fuel cells and spintronics [1].
Additionally, in its crystalline structure, small defects named oxygen gaps appear, caused by
its high potential pattern of reduction from Ce IV to Ce III or that it becomes an oxidizing
agent and the conferring agent. In this work we investigated the magnetic properties of
three ceria morphologies on a nanometric scale: nanocubes, nanowires and nanobelt that
were synthesized using the hydrothermal method. As samples prepared from studies by
using X-ray diffraction (XRD), transmission electron microscopy (TEM), magnetometry
(VSM) and paramagnetic resonance (EPR). XRD measurements show characteristic peaks of
ceria fluorite face-centered cubic structure. Measurements of magnetization in function of
the field applied at room temperature showing the ferromagnetic character with different
values of the coercive field and saturation magnetization, we observe an increase in the
coercive field and saturation magnetization in ceria nanocubes that can be explained by an
increase in the density of vacancy [2]. The zero field cooled (ZFC) and field cooled (FC)
magnetization curves measured on low magnetic fields show a soft maximum around 60 K
attributed to oxygen at the sample surface. Applying to the Curie-Weiss equation indicates
the presence of antiferromagnetic interactions mainly in nanobelt and nanocubes
morphologies. The EPR spectra at room temperature show two paramagnetic symmetry,
with axial symmetry with g1 = 1.97 and g2 = 1.94 associated with Ce 3+ and another isotropic
around g = 2.03 due to vacancies of isolated oxygen for all samples. The ferromagnetic
arrangement characterized by the presence of broad signals at about 3500 G is also
observed in nanobelt morphologies.
SOUZA, JULIANA P. de; SERNA, JILDER D.P.; MORAES, LETICIA P.R. de; SILVA, JULIO C.M.; ALVES, ODIVALDO C.
Structural and magnetic properties of CeO2 nanomaterials as a function of different morphologies: nanocube, nanowire and nanobelt.
In:
BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 128-128.
Disponível em: http://repositorio.ipen.br/handle/123456789/32834. Acesso em: $DATA.
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ALVES, ANDRESSA A.; QUEIROZ, ÁLVARO A.A. de
; QUEIROZ, ALFREDO A.A.E. de.
Fabrication of hyperbranched polyglycerols microcapsules from microfluidics guided by artificial neural networks.
In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 854-854.
Abstract:
In recent years, the microfluidic approach has received a lot of attention from the scientific
community due to the simple and efficient synthesis of highly monodisperse microcapsules
used in a variety of applications in biotechnology and medicine such as, for example,
materials synthesis, drug encapsulation, among others [1,2]. Thus, in this work,
hyperbranched polyglycerol microcapsules (HPGM) were developed using microfluidic
technology. Artificial neural network (ANN) feed-forward using multilayer perceptron
architecture was trained and applied to model and predict the microfluidic process. The
HPGM produced were characterized by scanning electron microscope (SEM), attenuated
total reflection-Fourier transform infrared (ATR-FTIR) and thermogravimetric analysis
(TGA). The fabricated HPGM showed spherical size and monomodal distribution with an
average diameter of 29 μm. The developed ANN proved to be efficient predictor, showing
well agreement with the experimental data (R2=0.9983). Based on these results in this
research, it was found that the microfluidic device for producing HPGM was successfully
developed since it was possible to synthesize microcapsules with targeted properties,
monodispersed with high stability and low porosity. In this way, microfluidic technology
guided by ANN can be used to synthesize HPGM for biotechnology processes.
ALVES, ANDRESSA A.; QUEIROZ, ÁLVARO A.A. de; QUEIROZ, ALFREDO A.A.E. de.
Fabrication of hyperbranched polyglycerols microcapsules from microfluidics guided by artificial neural networks.
In:
BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 854-854.
Disponível em: http://repositorio.ipen.br/handle/123456789/32833. Acesso em: $DATA.
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PORFÍRIO, TATIANE C.
; MUCCILLO, ELIANA N. dos S.
; MUCCILLO, REGINALDO
.
Electric field-assisted synthesis/sintering cerium oxide: 5 wt.% gadolinium oxide.
In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 321-321.
Abstract:
Gadolinium oxide ceramic powders were mixed to cerium oxide ceramic powders, pressed to
pellets, and sintered either at 1450ºC for 4 h or applying 200 V cm-1 electric field at 800ºC,
900ºC and 1000ºC. The structural phases and the microstructure of the sintered pellets were
analyzed by X-ray diffraction and scanning electron microscopy, respectively. The formation
of substitutional solid solution was followed by monitoring the increase of the electrical
conductivity by impedance spectroscopy measurements and the X-ray diffraction patterns.
The main results show that Joule heating due to the flow through the pellets of the electric
current, which was produced by the application of the electric field, allows for promoting
partial solid solution as well as partial sintering the ceria-gadolinia pellets. Moreover, grain
growth that occurred in the high temperature sintered pellets was inhibited in the electric
field-assisted synthesized/sintered pellets, being an alternative technique for producing
cerium oxide-gadolinium oxide solid solutions.
PORFÍRIO, TATIANE C.; MUCCILLO, ELIANA N. dos S.; MUCCILLO, REGINALDO.
Electric field-assisted synthesis/sintering cerium oxide: 5 wt.% gadolinium oxide.
In:
BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 321-321.
Disponível em: http://repositorio.ipen.br/handle/123456789/32832. Acesso em: $DATA.
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LANDGRAF, FERNANDO J.G.; MORAIS, WILLY A. de; GUZMAN, JHOAN; MARTORANO, MARCELO; NOBRE, RAFAEL de M.; NEVES, MAURICIO M. das
.
Effects of laser power and speed on keyhole formation during additive manufacturing by laser-powder bed fusion.
In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 656-656.
Abstract:
Unique microstructures are generated by the laser powder bed fusion (L-PBF) process of
additive manufacturing. The moving molten metal pool created by the laser beam leaves a
metallographic evidence, here called melt pool profile. The melt pool profile is easily
identified in many alloys owing to the severe segregation at the beginning of the epitaxial
cellular solidification, on the border of the remelted zone. The resulting microstructure is
associated with the laser scanning strategy used in building the piece. Twenty-four different
conditions of laser beam speed and power were adopted for a bed of plasma atomized
powder of a Nb-48% Ti alloy. Width and depth of the melt pool profiles in the top layer of all
samples were analyzed by optical microscopy. For lower energy densities and faster laser
scanning speeds, the shape of the melt pool profile is nearly parabolic. When the speed
decreases, within a certain limit dependent on the laser power, the shape changes to a
characteristic keyhole-type profile, with a larger depth to width ratio. The keyhole profile is
due to the presence of a wide, shallow parabolic pool and a narrow and deep pool formed by
a transient evaporation cavity. The experimental results are compared to the available
literature.
LANDGRAF, FERNANDO J.G.; MORAIS, WILLY A. de; GUZMAN, JHOAN; MARTORANO, MARCELO; NOBRE, RAFAEL de M.; NEVES, MAURICIO M. das.
Effects of laser power and speed on keyhole formation during additive manufacturing by laser-powder bed fusion.
In:
BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 656-656.
Disponível em: http://repositorio.ipen.br/handle/123456789/32831. Acesso em: $DATA.
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-
FRANCISCO, LEONARDO H.C.
; MOREIRA, RENAN P.
; SALVADOR, FRANCINE F. da S.
; MOTTA, MARCIO P.; FELINTO, MARIA C.F. da C.
; BRITO, HERMI F..
Near-infrared emitting Cr(3+)-doped mixed oxide luminescent materials for optical imaging.
In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 194-194.
Abstract:
The rapid growth of optical imaging in the latest years proposes novel alternatives to well-established
imaging techniques, in a way that current research interest within this field is
now focused on the design of efficient photonic materials and optical sensors[1-2]. In this
scenario, this work presents the development of Cr3+-doped Zn/Mg/Sn mixed oxides
prepared via solid-state and microwave synthesis, exhibiting interesting spectroscopic
properties in the red to near-infrared (NIR) range. Prepared compounds were analyzed by
PXRD, where the obtained diffraction profiles followed mainly the overlapping Mg2SnO4 and
Zn2SnO4 patterns, and crystallite size was estimated to be about 70 nm. SEM/EDS analysis
revealed micrometer-sized particles up to 20 μm, but much smaller particles and
homogeneous Cr3+ distribution were also observed. Moreover, Synchrotron radiation
measurements obtained at the Brazilian Synchrotron Light Laboratory, on the TGM
beamline via Vacuum UV Spectroscopy within the 4.5–7.5 eV energy range revealed distinct
emission profiles with increasing Zn concentration, affecting the contribution of deep-red
and NIR vibronic sidebands at 700 and 720 nm, respectively. Still, maximum absorption
energies (about 6.6 eV) remained constant for all the analyzed compounds, whereas the
broad-band NIR emission of Cr3+ ion centered around 770 nm assigned to the [4T2(t2e)→4A2]
transition is predominant. Persistent luminescence decay curves under near-band gap
excitation were also probed. Thus, in this work, we demonstrated an effective way to
assemble NIR emitting luminescent materials with potential applications in optical imaging
and photonics, where similar and expensive Cr3+-doped gallates are already widely explored.
FRANCISCO, LEONARDO H.C.; MOREIRA, RENAN P.; SALVADOR, FRANCINE F. da S.; MOTTA, MARCIO P.; FELINTO, MARIA C.F. da C.; BRITO, HERMI F.
Near-infrared emitting Cr(3+)-doped mixed oxide luminescent materials for optical imaging.
In:
BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS,
August 30 - September 3, 2021,
Online.
Abstract...
São Carlos, SP: Aptor Software,
2021.
p. 194-194.
Disponível em: http://repositorio.ipen.br/handle/123456789/32830. Acesso em: $DATA.
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GOTTARDI, MARIELLA da S.
; KAWAMOTO, DIONE; ZAMATARO, CLAUDIA B.
; ANA, PATRICIA A. da
; MAYER, MARCIA P.A.; ZEZELL, DENISE M.
.
In vivo study of diode laser 940 nm operating in high intensity mode in the periimplantitis disease.
In: LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser in Dentistry,
2018.
p. 62-62.
Abstract:
The evolution of periimplantitis has been
associated with several risk factors.
The standard treatment consists on
subgingival scaling and blasting with
sodium bicarbonate. This 6 months
longitudinal clinical study evaluated
and compared two treatment methods:
conventional as described and
complemented by irradiation with high
intensity diode laser (940 nm, Biolase)
aiming to establish a more efficient
periimplantitis management. After
approval by the Human Research Ethics
Committee, 20 patients of both sexes, with
implants in function for at least 12 months
and with diagnosis of periimplantitis
were selected and randomly distributed
in two experimental groups. Ten of them
were conventionally treated as control
group, and the remaining ten were in
the laser treated group (1W, 4.24kJ/
cm2 energy density, pulsed mode, 30s,
twice). There were six sites for treatment
standardization: vestibular region (mesial,
central and distal thirds) and buccal
region (mesial, central and distal thirds).
Results has shown that overall clinical
evaluation has no significant difference
between groups control and treatment.
less bleeding and suppuration, as
shallower periodontal pocket indicated
a decreasing tendency on laser treated
group. Quantitation of total bacteria
and Porphyromona gingivalis by real-time
PCR shown that laser synergy is a
complementary therapy that could act as
an additional option to the conventional
treatment in difficult response cases.
GOTTARDI, MARIELLA da S.; KAWAMOTO, DIONE; ZAMATARO, CLAUDIA B.; ANA, PATRICIA A. da; MAYER, MARCIA P.A.; ZEZELL, DENISE M.
In vivo study of diode laser 940 nm operating in high intensity mode in the periimplantitis disease.
In:
LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser in Dentistry,
2018.
p. 62-62.
Disponível em: http://repositorio.ipen.br/handle/123456789/32778. Acesso em: $DATA.
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MORAES, MARCIA C.D.
; PEREIRA, DAISA L.
; ZAMATARO, CLAUDIA B.
; ZEZELL, DENISE M.
; FREITAS, ANDERSON Z.
.
Effect of Nd:YAG laser on caries prevention of dental enamel by optical attenuation coefficient with optical coherence tomography (OCT).
In: LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser in Dentistry,
2018.
p. 48-48.
Abstract:
Caries is a multifactorial disease, caused
by the continuing loss of hydroxyapatite
crystals. The association of topical
acidulated phosphate fluoride application
(APF) and high intensity lasers has the
potencial to increase the resistance
to demineralization of dental tissues.
The Nd:YAG laser, specially associated
to a photoabsorber over the dental
surface, may induce thermal changes
in order to increase the resistance to
demineralization. Optical Coherence
Tomography (OCT) is a non-ionizing
radiation imaging technique that can
be performed in real time in vivo and
can detect early changes in the optical
properties of t issues. This study aimed
to characterize the effectiveness of the
association of Nd:YAG la ser and APF
gel in the prevention of caries lesions
in human dental enamel in vitro, due to
structural changes in function of the pH
cycling, the treatments performed as
well as to evaluate the potential of OCT
to diagnose early demineralization. 160
human enamel samples were divided in
four groups and submitted to pH cycling
during 20 days, after the following
treatments: G1- untreated; G2- treated
with APF gel (1.23% F-, 4min); G3-
irradiated with Nd:YAG (1064nm, 84.9J/
cm2, 10Hz) followed by APF application
and G4- APF application before Nd:YAG
laser irradiation (same conditions of G3).
OCT (930 nm) analysis were performed
before and after the treatments, 5th,
10th, 15th and 20th day of pH cycling.
The optical attenuation coefficient
decreased significantly (p<0.05) as
demineralization increased over time
and better results were achieved in group
G4. OCT technique can diagnose early
demineralization in enamel.
MORAES, MARCIA C.D.; PEREIRA, DAISA L.; ZAMATARO, CLAUDIA B.; ZEZELL, DENISE M.; FREITAS, ANDERSON Z.
Effect of Nd:YAG laser on caries prevention of dental enamel by optical attenuation coefficient with optical coherence tomography (OCT).
In:
LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser in Dentistry,
2018.
p. 48-48.
Disponível em: http://repositorio.ipen.br/handle/123456789/32777. Acesso em: $DATA.
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-
PEREIRA, DAISA L.
; MORAES, MARCIA C.D.
; ZAMATARO, CLAUDIA B.
; ZEZELL, DENISE M.
.
Longevity of diode laser irradiation in dentine: an in vitro study.
In: LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser in Dentistry,
2018.
p. 47-47.
Abstract:
The efficacy of pulsed infrared lasers
on clinical dentin wear sensitivity is
well stablished in the Literature. This
work aims to evaluate the effect of
diode laser combined with fluoride
products regarding the longevity of the
sensibility treatment under the effect of
the domestic use products. After Ethics
Committee approval, 75 slabs of bovine
root dentin measuring 8 mm2, were
randomized into 5 groups (n=1 5): G1-
untreated; G2- treated with acidulated
phosphate fluoride (APF-gel, [F-J=1.23
%, pH=3.3 to 3.9); G3- irradiated with
diode laser (980 nm, 2.5W, 5ms, 25Hz)
using a cool paste as photoabsorber;
G4- irradiated with diode laser (same
conditions of G3) using a coal paste as
photoabsorber + application of APF-gel
and G5- application of APF-gel+ diode
laser irradiation (same conditions of
G3). All samples were submitted to an
erosive and abrasive demineralization
(Sprite Zero, pH=2.8, 90s, 4x/day), and
remineralization (artificial saliva, pH=7.4)
cycling for 10 days. Twice a day, slabs
were brushed for 15s using a whitening
dentifrice (Sensodyne True White, GSK,
EUA). Slabs were evaluated by Optical
Coherence Tomography (OCT) at the
initial and 7th day of cycling. OCT
measurements found a significant
increase on dentin wear depth and
area of lesions with the increase of
cycling days. G1 and G2 hod significant
higher mineral loss compared to the
other groups. G3, G4 and GS showed no
significant differences between them.
Results suggested that the sensibility of
the treatment with the diode laser has
longevity despite the high abrasivity of
dentifrice used in maintenance.
PEREIRA, DAISA L.; MORAES, MARCIA C.D.; ZAMATARO, CLAUDIA B.; ZEZELL, DENISE M.
Longevity of diode laser irradiation in dentine: an in vitro study.
In:
LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser in Dentistry,
2018.
p. 47-47.
Disponível em: http://repositorio.ipen.br/handle/123456789/32776. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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ZAMATARO, CLAUDIA B.
; PEREIRA, DAISA de L.
; LIMA, CASSIO A.
; SCAPIN, MARCOS A.
; ZEZELL, DENISE M.
.
Gamma sterilized human dental enamel submitted to Er,Cr: YSGG laser irradiation associated to fluoride for in situ model.
In: LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser in Dentistry,
2018.
p. 89-89.
ZAMATARO, CLAUDIA B.; PEREIRA, DAISA de L.; LIMA, CASSIO A.; SCAPIN, MARCOS A.; ZEZELL, DENISE M.
Gamma sterilized human dental enamel submitted to Er,Cr: YSGG laser irradiation associated to fluoride for in situ model.
In:
LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser in Dentistry,
2018.
p. 89-89.
Disponível em: http://repositorio.ipen.br/handle/123456789/32775. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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BEZERRA, SAVIO J.C.; TREVISAN, LETICIA R.; VIANA, ITALLO E.L.; LOPES, RAQUEL M.; PEREIRA, DAISA de L.
; SAKAE, LETICIA O.; ARANHA, ANA C.C.; SCARAMUCCI, TAIS.
Er,Cr:YSGG laser associated to fluoride on the control of dentin erosion progression.
In: LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser in Dentistry,
2018.
p. 88-88.
Abstract:
1) Introduction: The combination
between high power lasers
and fluoride may potentially
control the progression of dentin
erosion. Therefore, the aim of this
study was to evaluate the effect
of Er,CrYSGG laser, associated
to fluoride application, in the
control of dentin erosion.
2) Materials and Methods: Dentin
slabs were embedded into acrylic
resin, flattened and polished.
The specimens (n=10) were previously
eroded (10min immersion
in 1% citric acid solution) and
randomly allocated into the
experimental groups, according
to the following treatments:
control (no treatment); acidulated
phosphate fluoride (APF) gel
(1.23% F, 1min); Er,Cr:YSGG laser
irradiation (parameter 1: 0.25W,
20Hz, 2.8J/cm2); Er,Cr:YSGG
loser irradiation (parameter 2:
0.50W, 20Hz, 5.7J/cm2); APF
gel+Er,Cr:YSGG laser parameter
1 and; APF gel+Er,Cr:YSGG
laser parameter 2. After, they
underwent on erosion-remineralization
cycling, consisting
of a 5min immersion into 0.3%
citric acid, followed by 60min
exposure to artificial saliva. This
procedure was repeated 4x/day,
for 5 days. Surface loss (SL, in
μm) was determined with optical
profilometry. The specimens
were analyzed by environmental
scanning electron microscopy
(n=3). Data were statistically
analyzed (α=0.05).
3) Results: None of the groups
significantly differed from the
control group, except for the
APF group. APF gel presented
the lowest SL, not differing from
Er,Cr.YSGG laser (parameter 1)
and APF gel+Er,Cr:YSGG laser
(parameter 1). Selective structure
removal was observed for the
laser-treated groups.
4) Conclusions: None of the
Er,Cr:YSGG laser parameters
were effective in the control of
dentin erosion. The laser was
also not able to enhance the
protection of fluoride against
dental erosion.
BEZERRA, SAVIO J.C.; TREVISAN, LETICIA R.; VIANA, ITALLO E.L.; LOPES, RAQUEL M.; PEREIRA, DAISA de L.; SAKAE, LETICIA O.; ARANHA, ANA C.C.; SCARAMUCCI, TAIS.
Er,Cr:YSGG laser associated to fluoride on the control of dentin erosion progression.
In:
LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser in Dentistry,
2018.
p. 88-88.
Disponível em: http://repositorio.ipen.br/handle/123456789/32774. Acesso em: $DATA.
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-
YOSHIKAWA, HELENICE Y.; DAGUANO, JULIANA K.M.B.; PEREIRA, DAISA L.
; ZEZELL, DENISE M.
; ANA, PATRICIA A.
.
Effects of Er,Cr:YSGG laser and a bioactive glass on root caries remineralization.
In: LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser in Dentistry,
2018.
p. 87-88.
Abstract:
Considering the aging of the
population, the greater exposure
of the root surfaces and the higher
caries risk in these surfaces,
the development of strategies
that efficiently remineralize root
caries lesions in a long-lasting
way is strictly necessary. This
in vitro blind randomized study
evaluated the potential of remineralization
of root caries lesions
promoted by Er,Cr:YSGG laser
irradiation (2.78 μm) associated
with a bioactive glass (Biosilicate
®). 60 bovine root dentin
slabs with incipient caries lesions
were distributed in 6 experimental
groups {n:::15l, in order to be treated
with laser irradiation (0.25W,
12.5 mJ/pulse, 2.8 J/cm2, 20 Hz,
without refrigeration), application
of Biosilicate® or association
of both. After the treatments,
the samples were subjected to
an 8-day pH-cycling regimen,
and further evaluated by Fourier
transformed infrared spectroscopy
{FTIR), optical coherence
tomography (OCT) and scanning
electron microscopy. The data
were statistically analyzed at a 5% significance level. The Biosiljcate
® promoted the formation of
carbonated hydroxyapatite even
before loser irradiation, which
was better retained after demineralization
in loser irradiated
group. The Biosilicote® and the
la ser irradiation alone provided
the remineralization of the root
dentin in a similar way to that
promoted by the topical application
of acidulated phosphate
fluoride, since all groups had
comparable optical attenuation
coefficients. The association of
the Biosilicate® with the loser
irradiation showed higher optical
attenuation coefficient than the
other experimental groups. It
was concluded that the association
of Biosilicote® with laser
irradiation promoted a synergistic effect, augmenting the
remineralization of root dentin
and preventing the progression
of caries.
YOSHIKAWA, HELENICE Y.; DAGUANO, JULIANA K.M.B.; PEREIRA, DAISA L.; ZEZELL, DENISE M.; ANA, PATRICIA A.
Effects of Er,Cr:YSGG laser and a bioactive glass on root caries remineralization.
In:
LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser in Dentistry,
2018.
p. 87-88.
Disponível em: http://repositorio.ipen.br/handle/123456789/32773. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
PEREIRA, DAISA L.
; GOMES, GABRIELA V.
; SUGAHARA, VANESSA M.L.; SCAPIN, MARCOS A.
; ANA, PATRICIA A.
; ARANHA, ANA C.C.; ZAMATARO, CLAUDIA B.
; ZEZELL, DENISE M.
.
Nd:YAG laser irradiation of darkened dental enamel by means of dentrifice use.
In: LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser in Dentistry,
2018.
p. 87-87.
Abstract:
As the world population is growing
older, dental erosion became
a real concern on dentistry.
Optical Coherence Tomography
and X-Ray fluorescence were
used to analyze enamel samples
covered by black dentifrice as
photoabsorber irradiated with
NdYAG laser, then submitted to
an erosive cycling. Heat injury
risk in deeper tissue decreases
because of the dentifrice dark
pigment, when the most of photons
are absorbed in the surface.
Sixty Bmm2 blocks of bovine
enamel, were randomized into 4
groups: G1- untreated; G2- treated
with acidulated phosphate
fluoride (APF, [FJ::1.23%, pH::3.3 to
3.9); G3- irradiated with Nd:YAG
laser (1064nm, 0.6W, 10Hz- Lares
Research®) using a coal paste as
photoabsorber; G4- irradiated
with Nd:YAG laser (1064nm, 0.6W,
10Hz), using a black dentifrice
(Black is White, Curaprox®). All
samples were submitted to a
3-day erosive demineralization
(Citric acid 1%, pH::3.6, 5min,
2x/day) under agitation, and
remineralization cycling (artificial
saliva, pH::7, 120minJ. After
treatments and pH cycling, the
[Ca]/[P] ratio decreased in the
laser irradiated groups. The
samples were evaluated by OCT
before and after treatment and
after erosive cycling. OCT measurements
found smaller lesion
depths in laser irradiated groups
than in the other groups and
there were statistically significant
differences between G3 and G4
groups (p<0.05). Heating promoted
by Nd:YAG laser irradiation
changed the morphological and
crystallographic enamel surface
properties and has shown to be a
promissory alternative to prevent
erosion.
PEREIRA, DAISA L.; GOMES, GABRIELA V.; SUGAHARA, VANESSA M.L.; SCAPIN, MARCOS A.; ANA, PATRICIA A.; ARANHA, ANA C.C.; ZAMATARO, CLAUDIA B.; ZEZELL, DENISE M.
Nd:YAG laser irradiation of darkened dental enamel by means of dentrifice use.
In:
LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser in Dentistry,
2018.
p. 87-87.
Disponível em: http://repositorio.ipen.br/handle/123456789/32772. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
LOPES, MONICA S.; PEREIRA, DAISA L.
; MOTA, CLAUDIA C.B.O.; ANA, PATRICIA A.
; ZEZELL, DENISE M.
; GOMES, ANDERSON S.L..
Shear bond strength of lingual brackets on enamel surface submitted to acid-etching or Nd:YAG laser irradiation.
In: LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser Dentistry,
2018.
p. 82-82.
Abstract:
The patient demand for aesthetic
orthodontic solutions is driving
for use of lingual brackets and laser
irradiation can prevent dental
caries in this region. This in vitro
study is the first one in literature
that aimed to quantify the shear
bond strength (SBS) on direct lingual
b rackets bonding after different
enamel surface pre-treatments.
75 bovine incisor teeth
were randomized in 5 groups
(n=15): G1- untreated; G2- treated
with acidulated phosphate
fluoride gel (APF-gel, [F-] =1.23%,
pH=3.3 to 3.9); G3- conditioned
with 37% phosphoric acid (Condoc
37%, FGM, Brazil) and treated
with APF-gel; G4- irradiated
with Nd:YAG loser (1064nm, 0.6W,
10Hz- Laser Research) and treated
APF-gel; GS- irradiated with
Nd:YAG laser + conditioned with
37% phosphoric acid + treated
with APF-gel. The positioning of
the brackets was standardized
during the bonding procedure
using a positioner and Transbond
XT adhesive (3M Unitek, USA) was
used. After bonding, all samples
were thermocycled (500 cycles
between SoC and 55°C) and
submitted to a 48h cariogenic
challenge. After cycling, the
samples were tested for shear bond strength (SBS) in a universal
testing machine (0.5mm/min).
SBS test values were statistically
higher (p<0.05) in the G3 and G5
groups when compared to the
other groups. This study showed
that the Nd:YAG loser irradiation
improved dental adhesion
and increased the mechanical
resistance of the enamel because
the heating promoted by Nd:YAG
laser irradiation changed the
morphological and crystallographic
properties of enamel;
in this way, this treatment also
offers the advantage to prevent
caries around brackets.
LOPES, MONICA S.; PEREIRA, DAISA L.; MOTA, CLAUDIA C.B.O.; ANA, PATRICIA A.; ZEZELL, DENISE M.; GOMES, ANDERSON S.L.
Shear bond strength of lingual brackets on enamel surface submitted to acid-etching or Nd:YAG laser irradiation.
In:
LASER DENTISTRY WORLD CONGRESS, 16th; DGL ANNUAL MEETING, 27th; INTERNATIONAL WALED CONGRESS, 6th,
October 1-3, 2018,
Aachen, Germany.
Abstract...
Aachen, Germany: International Society for Laser Dentistry,
2018.
p. 82-82.
Disponível em: http://repositorio.ipen.br/handle/123456789/32771. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
HARAGUCHI, MARCIO I.; KIM, HAE Y.; SPRENGER, FRANCISCO E.
; CALVO, WILSON A. P.
.
Imaging technique for troubleshooting of industrial equipment by gamma-ray absorption scans.
In: DUDALA, JOANNA (Ed.); STEGOWSKI, ZDZISLAW (Ed.) INTERNATIONACONFERENCE ON DEVELOPMENT AND APPLICATIONS OF NUCLEAR TECHNOLOGIES,
September 11-14, 2011,
Krakow, Poland.
2011.
p. 135.
Abstract:
Gamma scanning is one of the most common nuclear techniques on troubleshooting industrial
equipments like distillation columns and reactors. With a very simple concept, the technique
is easy to implement. Searching for a competitive edge the industry has been long developing
solutions to achieve better results. On the last decades, significant development has been done
with the advent of new equipments, electronics, portable computers and software, to the point
that nowadays the field work and reporting can be done in a question of hours. Continuous
scanning and wireless detection systems are examples of successful field solutions, while new
software aid on reporting and data presentation. However the type and quality of the results
itself has not dramatically changed since its beginning. A scan profile is simple to understand,
although the process to build it can be very complex as it requires a specific blend of
knowledge and abilities. Process Engineering, Chemical Engineering, Internal Hydraulic
Project, Nuclear Engineering and field abilities are pre requisites for of any scan specialist
rookie. Correct data gathering, interpretation and reporting are abilities often difficult to
match or requires a long time of training. Probably there are no more than a handful of scan
specialists on the world. The industry faces a similar difficult on the customer side, as it is
always necessary to train end users to understand a report and how to use its best. This paper
describes our effort on developing a new approach on the gamma scan test using image
reconstruction techniques that would result on a graphic image rather than a XY plot. Direct
and easier to understand, a report with graphic images would be also accessible to a wider
audience, not limited to the customers experienced with gamma scan interpretation.
HARAGUCHI, MARCIO I.; KIM, HAE Y.; SPRENGER, FRANCISCO E.; CALVO, WILSON A. P.
Imaging technique for troubleshooting of industrial equipment by gamma-ray absorption scans.
In:
DUDALA, JOANNA (ed.); STEGOWSKI, ZDZISLAW (ed.) INTERNATIONACONFERENCE ON DEVELOPMENT AND APPLICATIONS OF NUCLEAR TECHNOLOGIES,
September 11-14, 2011,
Krakow, Poland.
2011.
p. 135.
Disponível em: http://repositorio.ipen.br/handle/123456789/32770. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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FEIST, I.; ANDRADE, A.K.P.; DE MICHELI, G.; CAI, S.; PANUTTI, C.; ZEZELL, D.
; EDUARDO, C.P..
Bacterial reduction in class II furcation after root debridment with or without Nd:YAG laser irradiation.
In: LASER CONGRESS; CONGRESS OF THE EUROPEAN SOCIETY FOR ORAL LASER APPLICATIONS, 3rd; CONGRESO DE LA SOCIEDAD ESPANOLA DE LASER ODONTOESTOMATOLOGICO, 6th; CONGRESSO DELLA SOCIETA ITALIANA DI LASER IN ODONTOIATRIA, 4th,
May 19-21, 2005,
Barcelona, Spain.
Abstract...
Vienna, Austria / Barcelona, Spain: European Society for Oral Laser Applications - ESOLA / Sociedad Española de Láser Odontoestomatológico - SELO,
2005.
p. 14-15.
Abstract:
The use of Nd:YAG laser for bacterial reduction as an adjuvant to non-surgical periodontal treatment has been approached in several studies. Furcation complex anatomy is responsible for comprised treatment results in this areas due to the lack of proper access for instrumentation showing the persistence of a pathogenic microbial flora. The purpose of this clinical trial, randomized, double-blinded was to evaluated the bacterial reduction achieved with the Nd:YAG laser associated to conventional treatment on furcation sites of 17 patients with chronic periodontitis. They received previous full mouth periodontal treatment except for the experimental sites. In a split mouth design study, 34 class 11 furcations were selected and divided in two groups. The 17 furcations of the control group underwent twice manual and ultrasonic root debridment in weekly intervals. The test group received the same treatment as the control group followed by the Nd:YAG laser application (100 mJ/pulse, 1.5 W, 15 Hz, 60 see.). The microbiological parameters - total number of anaerobic Colony Forming Units (CFU), Black pigmented CFU and the level of A. actinomycetemcomitans, P. gingivalis and P. intermedia - were determined at baseline. immediately and one month after the treatment. The results showed a significant reduction of total CFU for both groups immediately after treatment, but it was better for the test group. After one month the total CFU average increased but was still below pretreatment levels for both groups. The Black pigmented CFU and the level of A. actinomycetemcomitans. P. gingivalis and P. intermedia decreased significantly after the treatment but 30 days after. there was an increase almost equal to baseline levels for both groups. The Nd:YAG laser associated with conventional treatment promoted bacterial reduction on class II furcation immediately after its application.
FEIST, I.; ANDRADE, A.K.P.; DE MICHELI, G.; CAI, S.; PANUTTI, C.; ZEZELL, D.; EDUARDO, C.P.
Bacterial reduction in class II furcation after root debridment with or without Nd:YAG laser irradiation.
In:
LASER CONGRESS; CONGRESS OF THE EUROPEAN SOCIETY FOR ORAL LASER APPLICATIONS, 3rd; CONGRESO DE LA SOCIEDAD ESPANOLA DE LASER ODONTOESTOMATOLOGICO, 6th; CONGRESSO DELLA SOCIETA ITALIANA DI LASER IN ODONTOIATRIA, 4th,
May 19-21, 2005,
Barcelona, Spain.
Abstract...
Vienna, Austria / Barcelona, Spain: European Society for Oral Laser Applications - ESOLA / Sociedad Española de Láser Odontoestomatológico - SELO,
2005.
p. 14-15.
Disponível em: http://repositorio.ipen.br/handle/123456789/32769. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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MARQUES, M.M.; HAYPEK, P.; EDUARDO, F.P.; MIGLIORATI, C.A.; ZEZELL, D.M.
; EDUARDO, C.P..
Effect of high intensity diode laser irradiation on growth of human gingival fibroblasts.
In: LASER CONGRESS; CONGRESS OF THE EUROPEAN SOCIETY FOR ORAL LASER APPLICATIONS, 2nd; CONGRESSO DELLA SOCIETA ITALIANA DI LASER IN ODONTOIATRIA, 2nd,
May 15-18, 2003,
Florence, Italy.
Abstract...
Vienna, Austria / Roma, Italy: European Society for Oral Laser Applications - ESOLA / Società Italiana di Laser in Odontoiatria - SILO,
2003.
p. 38-38.
Abstract:
Purpose: Diode lasers present some advantages over the other surgical lasers. The equipments are more compact and
can also be used in low intensity laser therapy. The aim of this study is to analyze a possible biostimulatory effect of the
diode laser on human cultured gingival fibroblasts.
Material and Methods: The celll ine FMM1 was grown in Dulbecco' modified Eagle medium. Laser irradiation was carried
out with a GaAIAs diode laser (wavelength: 808 nm, power output: 3.5 W, Zap Lasers, CA, USA). The irradiation
was done in a defocused and continuous wave mode using a fiber of 400 micrometers. The experiments were
done in triplicate (Group 1: non-irradiated cells; Group 2: cells irradiated with 3 J/cm2; and Group 3: cells irradiated
with 4 J/cm2). The data of the growth curves were analyzed by statistical means.
Results and Conclusion: The defocused diode laser irradiation used as low intensity laser therapy presents biostimulatory
effect on growth of human gingival fibroblasts.
MARQUES, M.M.; HAYPEK, P.; EDUARDO, F.P.; MIGLIORATI, C.A.; ZEZELL, D.M.; EDUARDO, C.P.
Effect of high intensity diode laser irradiation on growth of human gingival fibroblasts.
In:
LASER CONGRESS; CONGRESS OF THE EUROPEAN SOCIETY FOR ORAL LASER APPLICATIONS, 2nd; CONGRESSO DELLA SOCIETA ITALIANA DI LASER IN ODONTOIATRIA, 2nd,
May 15-18, 2003,
Florence, Italy.
Abstract...
Vienna, Austria / Roma, Italy: European Society for Oral Laser Applications - ESOLA / Società Italiana di Laser in Odontoiatria - SILO,
2003.
p. 38-38.
Disponível em: http://repositorio.ipen.br/handle/123456789/32768. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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BACHMANN, LUCIANO; PEREIRA, THIAGO M.; ZEZELL, DENISE M.
; FELIPE, JOAQUIM C..
Vibrational spectroscopy of biological tissues.
In: ENCONTRO DE OUTONO DA SOCIEDADE BRASILEIRA DE FÍSICA, 44.,
21-25 de junho, 2021,
Online.
Resumo...
São Paulo, SP: Sociedade Brasileira de Física,
2021.
Abstract:
The vibrational modes of molecules in biological tissues can be assessed by either Raman spectroscopy, through inelastic scattering, or infrared spectroscopy, through direct measurement of transmittance or reflectance. When combined with mathematical methods, vibrational spectroscopic techniques have shown promising results for evaluation of biochemical changes in biological samples, and such combination can be used to develop new tools for medical diagnosis. Here, we provide an overview of the infrared spectral imaging techniques we use to characterize biological tissues and describe how we employ these techniques to diagnose cancer and to evaluate inflammatory processes. In the last decade, we have studied thyroid and colon cancer tissues as well as inflammatory processes attributed to an early stage of cancer. All the samples were obtained from human biopsy embedded in paraffin and cut according to the usual procedures in pathology. The sample slides were deposited over a Calcium Fluoride window that is transparent in the infrared spectral region. An FTIR spectrometer with 4-cm-1 resolution coupled to a microscope with 6x6 microns of effective pixel size was employed. Pre-processing algorithms were necessary to remove unwanted absorption bands such as water vapor, carbon dioxide, and paraffin absorption bands. After that, the data of hyperspectral images were processed to classify and to predict tissue regions by using machine learning techniques. More recently deep learning algorithms have been employed to pre-diagnose colon and thyroid cancer. Aiming to identify tissue changes, deep neural networks can be trained under a supervised process by using the spectral values in different frequencies. The proposed study can be extended to other tissues and applied to a wide range of samples. A good dataset of samples to train the algorithms is key to achieving higher accuracy.
BACHMANN, LUCIANO; PEREIRA, THIAGO M.; ZEZELL, DENISE M.; FELIPE, JOAQUIM C.
Vibrational spectroscopy of biological tissues.
In:
ENCONTRO DE OUTONO DA SOCIEDADE BRASILEIRA DE FÍSICA, 44.,
21-25 de junho, 2021,
Online.
Resumo...
São Paulo, SP: Sociedade Brasileira de Física,
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32692. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
CASTRO, PEDRO A.A.
; PEREIRA, DAISA L.
; ZEZELL, DENISE M.
; RIBEIRO, HENRIQUE B.; MATOS, CHRISTIANO J.S.; ANA, PATRICIA A..
Confocal Raman spectroscopy characterization of Nd:YAG laser irradiation on dental enamel for erosion prevention.
In: ENCONTRO DE OUTONO DA SOCIEDADE BRASILEIRA DE FÍSICA, 44.,
21-25 de junho, 2021,
Online.
Resumo...
São Paulo, SP: Sociedade Brasileira de Física,
2021.
Abstract:
Confocal Raman spectroscopy is a non-destructive and non-invasive method used to obtain spectral features of biological structure and depth images without coming into contact with the sample. Biochemical content obtained by Raman microscopy is related to the characteristics of the tissues, allowing experimental use without any side effects to the sample. Complex biomolecular features can be resolved through confocal Raman imaging analysis with subcellular spatial resolution by using a single excitation wavelength laser to identify a large range of biomolecules. This work aims to characterize dental enamel irradiated by Nd:YAG laser and correlate the modified tissue in depth due to the heat propagation caused by laser absorption. For this, 30 blocks of bovine enamel were randomized into 3 groups: G1- enamel untreated; G2- enamel irradiated with Nd:YAG laser (1064 nm; 120s pulsewidth, 10Hz; 84,9 mJ/cm2; Lares Research) using a squid Ink as photoabsorber; G3- enamel irradiated with Nd:YAG laser (1064 nm; 5 ns; 20 Hz; 1,05 J/cm2 Brilliant, Quantel Laser) using a coal paste as photoabsorber. The phosphate intensity band was used as a spectral indicator of the groups characteristics. The Raman spectra of the Nd:YAG irradiated samples detected a phosphate intensity reduction in the G3 group after laser irradiation. There were distinct differences in the chemical activity after the laser irradiation and these findings, associated with the previous studies of our group, were related to the stability of the apatite, accompanied with the increased susceptibility to demineralization. The carbonate free apatite has been characterized as less likely to be affected by acid challenge. Based on our initial results, the thickness of the treated area is a critical variable in determining the resistance of erosion, especially for the type of photoabsorber associated with Nd:YAG. Our findings demonstrate the coal paste as a more resistant material to enamel erosion prevention. Therefore, fiber-optic confocal Raman imaging have shown potential to be an established spectroscopic choice for carie real-time monitoring.
CASTRO, PEDRO A.A.; PEREIRA, DAISA L.; ZEZELL, DENISE M.; RIBEIRO, HENRIQUE B.; MATOS, CHRISTIANO J.S.; ANA, PATRICIA A.
Confocal Raman spectroscopy characterization of Nd:YAG laser irradiation on dental enamel for erosion prevention.
In:
ENCONTRO DE OUTONO DA SOCIEDADE BRASILEIRA DE FÍSICA, 44.,
21-25 de junho, 2021,
Online.
Resumo...
São Paulo, SP: Sociedade Brasileira de Física,
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32691. Acesso em: $DATA.
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DEL-VALLE, MATHEUS
; SANTOS, MOISES O. dos
; SANTOS, SOFIA N. dos
; BERNARDES, EMERSON S.
; ZEZELL, DENISE M.
.
A deep learning approach for breast tissue malignancy diagnosis using micro-FTIR hyperspectral imaging.
In: ENCONTRO DE OUTONO DA SOCIEDADE BRASILEIRA DE FÍSICA, 44.,
21-25 de junho, 2021,
Online.
Resumo...
São Paulo, SP: Sociedade Brasileira de Física,
2021.
Abstract:
The breast cancer is the most incident cancer in women with an estimative of 2.1 million new cases in 2018. With the grown of deep learning techniques, several approaches in vibrational spectroscopy have been studied. In this way, this work aimed to classify breast samples as breast cancer or adenosis using a deep learning model. It was used the human breast cancer microarray BR804b (Biomax, Inc., USA), where one core of each group, cancer and adenosis, was imaged by a Cary Series 600 micro-FTIR imaging system (Agilent Technologies, USA). The system has a spatial resolution of 5.5 μm and about 100 thousand spectra were acquired for each group. The regions of interest were selected by two k-means clustering using amide I/II (1700 to 1500 cm-1) and highest paraffin intensity (1480 to 1450 cm-1) bands. Spectra were preprocessed by five steps: outlier removal using Hotelling’s T2 versus Q residuals; biofingerprint truncation; Savitzky–Golay filtering for smoothing and second derivative; Extended multiplicative signal correction (EMSC) with digital de-waxing; another outlier removal. The deep learning model was a convolutional neural network (CNN) fused with a fully connected neural network (FCNN). The CNN was built with 2 Conv1D-ReLU-MaxPooling1D-Dropout layers. The kernel size was set to 5 and dropout of 0.5. Dense layers were built by two layers of neurons-BatchNorm-ReLU-Dropout, with 100 and 50 neurons, dropout of 0.2. The output was a single neuron with sigmoid activation. Binary cross-entropy loss function was adopted with Adam optimizer. Accuracy metric was calculated during the training, where a threshold of 0.5 was applied on the output predictions. Model was trained by a 4-fold cross-validation by 20 epochs and using a batch size of 250. The train accuracy was 0.978/0.004 (mean/std), while the testing accuracy was 0.969/0.008, demonstrating a generalized model without overfitting. Accuracies near one indicate the proposed model as a potential technique for the breast cancer vs adenosis classification, where hyperparameters and the architecture should be optimized along higher sample number acquisition.
DEL-VALLE, MATHEUS; SANTOS, MOISES O. dos; SANTOS, SOFIA N. dos; BERNARDES, EMERSON S.; ZEZELL, DENISE M.
A deep learning approach for breast tissue malignancy diagnosis using micro-FTIR hyperspectral imaging.
In:
ENCONTRO DE OUTONO DA SOCIEDADE BRASILEIRA DE FÍSICA, 44.,
21-25 de junho, 2021,
Online.
Resumo...
São Paulo, SP: Sociedade Brasileira de Física,
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32690. Acesso em: $DATA.
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BRANCO, ISABELA S.L.
; BURIN, ANA L.
; YORIYAZ, HELIO
.
Métodos para criação de Spread-Out Bragg Peaks em protonterapia.
In: CONGRESSO BRASILEIRO DE FÍSICA MÉDICA, 25.,
19-23 de abril, 2021,
Online.
Resumo...
2021.
Observação: Vídeo de apresentação: https://youtu.be/Gx8gj17Ayh4
Abstract:
Em tratamentos com feixes de prótons, as distribuições de dose longitudinais caracterizam-se pela presença do pico de Bragg (Bragg Peak - BP). A sobreposição de vários picos com diferentes energias e a ponderação de cada um fazem-se necessárias para irradiar homogeneamente um grande volume tumoral, criando um Spread-Out Bragg Peak (SOBP). O objetivo deste trabalho consiste em analisar três diferentes métodos para criação dos SOBPs – método de Bortfeld, método da função inversa e método das matrizes. Simulações de Monte Carlo foram realizadas com o software TOPAS, nelas, feixes monoenergéticos de prótons incidiram em um objeto simulador retangular de água para que distribuições de dose fossem contabilizadas em profundidade. O método das matrizes conseguiu ajustar o peso de cada curva de forma a produzir SOBPs com melhor homogeneidade, ao mesmo tempo que, os dois outros métodos foram mais custosos computacionalmente.
BRANCO, ISABELA S.L.; BURIN, ANA L.; YORIYAZ, HELIO.
Métodos para criação de Spread-Out Bragg Peaks em protonterapia.
In:
CONGRESSO BRASILEIRO DE FÍSICA MÉDICA, 25.,
19-23 de abril, 2021,
Online.
Resumo...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32689. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
BURIN, ANA L.
; BRANCO, ISABELA S.L.
; YORIYAZ, HELIO
.
Estudo dos parâmetros WER e WET em protonterapia com simulações de Monte Carlo.
In: CONGRESSO BRASILEIRO DE FÍSICA MÉDICA, 25.,
19-23 de abril, 2021,
Online.
Resumo...
2021.
Observação: Vídeo de apresentação: https://youtu.be/3cvapMx0WJ0
Abstract:
O presente trabalho apresenta um estudo comparativo dos valores da razão equivalente de água (WER – Water Equivalent Ratio), e da espessura equivalente de água (WET – Water Equivalent Thickness) para várias energias obtidos com os códigos de Monte Carlo (MCNP6 e TOPAS) em protonterapia. Para utilizar plenamente as vantagens dosimétricas que a terapia de prótons proporciona, o conhecimento exato do alcance do feixe (range) é essencial. Os parâmetros WER e WET são utilizados para relacionar o range em água com outros materiais e tecidos do corpo humano. Nesse contexto, o principal objetivo deste trabalho é contribuir com o aprimoramento do cálculo de dose em protonterapia, mais especificamente no cálculo de WER e WET em meios tecidos equivalentes. O estudo demonstrou que os valores de WER e WET são constantes com a energia, sendo que, as diferenças relativas encontradas foram inferiores a 1% para ambos os parâmetros, o que simplificará os cálculos de dose futuros.
BURIN, ANA L.; BRANCO, ISABELA S.L.; YORIYAZ, HELIO.
Estudo dos parâmetros WER e WET em protonterapia com simulações de Monte Carlo.
In:
CONGRESSO BRASILEIRO DE FÍSICA MÉDICA, 25.,
19-23 de abril, 2021,
Online.
Resumo...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32688. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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ROMBALDI, PAULO V.L.
; MAZER, AMANDA C.
; SHORTO, JULIAN M.B.
; RIBEIRO, VICTOR A.B.
; YORIYAZ, HELIO
.
Comparação da distribuição de dose experimental e calculada por Monte Carlo de uma unidade de raios-X XVI da Elekta ®.
In: CONGRESSO BRASILEIRO DE FÍSICA MÉDICA, 25.,
19-23 de abril, 2021,
Online.
Resumo...
2021.
Observação: Vídeo de apresentação: https://www.youtube.com/watch?v=MrvAydGtQjA
Abstract:
Com o aumento do uso das tecnologias de IGRT na prática clínica, há uma preocupação com uma possível adição significativa de dose de radiação aos tecidos sadios do paciente, aumentando o risco de induzir cânceres secundários por exposições concomitantes. O propósito deste estudo consiste em quantificar a dose concomitante recebida por pacientes em tratamento com Radioterapia Guiada por Imagem (IGRT) exclusivamente devido aos raios-X produzidos pela unidade XVI, unidade de tomografia computadorizada de feixe cônico (CBCT) acoplado ao acelerador linear da Elekta, localizado no ICESP (Instituto do Câncer do Estado de São Paulo). Também foram realizadas comparações de dados obtidos a partir de medidas experimentais e simulações com o código de Monte Carlo MCNP6.
ROMBALDI, PAULO V.L.; MAZER, AMANDA C.; SHORTO, JULIAN M.B.; RIBEIRO, VICTOR A.B.; YORIYAZ, HELIO.
Comparação da distribuição de dose experimental e calculada por Monte Carlo de uma unidade de raios-X XVI da Elekta ®.
In:
CONGRESSO BRASILEIRO DE FÍSICA MÉDICA, 25.,
19-23 de abril, 2021,
Online.
Resumo...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32687. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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HERBST, LUCAS S.; RODRIGUES, LETICIA L.C.
.
Análise Qualitativa de medida de distribuição de dose em Braquiterapia com Dosímetro Fricke Gel utilizando imagem em Ressonância Magnética.
In: CONGRESSO BRASILEIRO DE FÍSICA MÉDICA, 25.,
19-23 de abril, 2021,
Online.
Resumo...
2021.
Observação: Vídeo de apresentação: https://youtu.be/S3pY74iRk6Y
Abstract:
Com a popularização de imagens tridimensionais, técnicas como IMRT e VMAT são constantemente estudadas e estão sob forte escrutínio científico. Geralmente a braquiterapia fica sob um holofote menos intenso, e acaba ficando em segundo plano nos serviços. O Brasil utiliza a técnica principalmente em tratamentos ginecológicos, embora tratamentos pélvicos masculinos estejam cada vez mais comuns. Com a migração dos serviços de uma técnica baseada em prescrições de dose em pontos, para um cálculo tridimensional cada vez mais o interesse por uma avaliação da distribuição de dose aumenta. Esse trabalho busca avaliar o uso de um dosímetro verdadeiramente tridimensional para medir essas distribuições de dose. Primeiramente foi realizada a calibração do dosímetro com imagens de ressonância magnética. Posteriormente uma irradiação utilizando uma sonda de titânio com uma única parada foi avaliada qualitativamente. O planejamento foi feito utilizando o algoritmo Acuros BV, um dos mais novos disponíveis no mercado, e em boa correlação com cálculos com Monte Carlo. Cada ponto foi calculado como a média com os pontos vizinhos, para diminuir ruídos da imagem, tornando-a mais suave. Visualmente existe uma boa correlação entre as medições e o planejamento, em uma continuação do trabalho, uma análise quantitativa utilizando avaliação gama será realizada.
HERBST, LUCAS S.; RODRIGUES, LETICIA L.C.
Análise Qualitativa de medida de distribuição de dose em Braquiterapia com Dosímetro Fricke Gel utilizando imagem em Ressonância Magnética.
In:
CONGRESSO BRASILEIRO DE FÍSICA MÉDICA, 25.,
19-23 de abril, 2021,
Online.
Resumo...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32686. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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-
MAZER, AMANDA C.
; YORIYAZ, HELIO
.
Algoritmo para avaliação de registro de imagem baseado na técnica SIFT (Scale Invariant Feature Transform).
In: CONGRESSO BRASILEIRO DE FÍSICA MÉDICA, 25.,
19-23 de abril, 2021,
Online.
Resumo...
2021.
Observação: Vídeo de apresentação: https://youtu.be/k1405XduFEo
Abstract:
A avaliação de um registro de imagem deve ser feita a partir de um grande número de pontos distribuídos pelas imagens utilizadas no processo. Neste trabalho, a técnica SIFT, que permite extrair automaticamente pontos estáveis de uma imagem, foi utilizada para desenvolver um algoritmo na linguagem Python para ser aplicado para avaliação de registro de imagens médicas 3D. Imagem de TC (tomografia computadorizada) foi usada para realizar testes de redundância envolvendo diferentes transformações, a fim de obter pontos correspondentes entre a imagem original e a imagem sintética transformada. Para todos os testes, o algoritmo foi capaz de identificar pontos estáveis, em que a maioria era verdadeiramente correspondente, de acordo com diferentes margens de erro. Entretanto, o algoritmo ainda se encontra em fase de validação.
MAZER, AMANDA C.; YORIYAZ, HELIO.
Algoritmo para avaliação de registro de imagem baseado na técnica SIFT (Scale Invariant Feature Transform).
In:
CONGRESSO BRASILEIRO DE FÍSICA MÉDICA, 25.,
19-23 de abril, 2021,
Online.
Resumo...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32685. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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FERREIRA, MARIA C. de M.S.C.; CASTRO, PEDRO A.A. de
; PERALTA, FELIPE da S.; KITAKAWA, DARCIO; ZEZELL, DENISE M.
; CARVALHO, LUIS F. das C. e S. de.
Optical biopsy and artificial intelligence as a diagnostic tool of smokers: a pilot study.
In: FÓRUM ON-LINE DE TECNOLOGIAS DA LUZ NA SAÚDE, 2nd,
May 20-22, 2021,
Online.
Abstract...
Campinas, SP: Faculdade São Leopoldo Mandic,
2021.
Abstract:
Background: FT-IR spectroscopy can investigate and detect tissue changes at biochemical levels, the result is obtained quickly, it needs a small sample amount, which can be biofluids. Objective: Compare saliva between smoking and non-smoking patients by FT-IR spectroscopy, as an optical biopsy technique and associate with data processing methods based on artificial intelligence. It will be possible to investigate biochemical changes at the molecular level, and in the future use it as an early diagnosis of oral cancer. Methodology: This study was approved by the Research Ethics Committee, and was conducted using a FT-IR spectroscopy coupled with and attenuated total reflection accessory. Volunteers were divided into three groups, however just 10 patients were analyzed as pilot study. In control group were collected saliva of volunteers who had never tried tobacco (15 spectra from 5 samples). In smoking group patients over 40 years old who smoke more than one pack of cigarettes a day (3 spectra from 1 sample); In sporadic smoking group, patients who smoke sporadically and/or socially (12 spectra from 4 samples). Results: In all groups, the structural components were DNA, RNA, lipids, proteins and Amide. The spectra showed different intensities in the respective structural components mentioned above, so that subtle differences could prove that the saliva of smoking patients has differences with normal patients. Conclusion: Optical biopsy and artificial intelligence could be used in the medical field, it is a safe and label technique, more patients should be analyzed for solid results.
FERREIRA, MARIA C. de M.S.C.; CASTRO, PEDRO A.A. de; PERALTA, FELIPE da S.; KITAKAWA, DARCIO; ZEZELL, DENISE M.; CARVALHO, LUIS F. das C. e S. de.
Optical biopsy and artificial intelligence as a diagnostic tool of smokers: a pilot study.
In:
FÓRUM ON-LINE DE TECNOLOGIAS DA LUZ NA SAÚDE, 2nd,
May 20-22, 2021,
Online.
Abstract...
Campinas, SP: Faculdade São Leopoldo Mandic,
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32684. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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OLIVEIRA, ANDRESSA B.; FAGUNDES, JESSYCA L.A.; VEADO, HENRIQUE C.; FORTES, BEATRIZ N.A.; BITTENCOURT, ALEXANDRA A.; ADORNO, JOSE; CASTRO, MARCIO B.; VASQUEZ, PABLO A.S.
; SANTOS, PAULO S.
; DALLAGO, BRUNO S.L.; CAMPEBELL, RITA C..
Uso de pele de rã na cicatrização de feridas em equinos / Use of frog skin in wound healing in horses.
In: SIMPOSIO INTERNACIONAL DO CAVALO ATLETA, 5.,
April 26-30, 2021,
Online.
Abstract...
Belo Horizonte, MG: EV-UFMG,
2021.
Abstract:
A pele de rã (Rana catesbeiana) possui peptídeos com ação antimicrobiana, resistência mínima a perda de água e otimiza o processo cicatricial de feridas. Objetivou-se avaliar a cicatrização de feridas experimentais tratadas com pele de rã (GPR), desidratada e esterilizada com raios gama, comparando os achados clínicos e histopatológicos com feridas tratadas com ringer com lactato (GC). Utilizando-se cinco equinos saudáveis, foram realizadas feridas (3 x 3 cm), duas de cada lado da região lombar, distantes 7 cm, incluindo pele e subcutâneo, sendo que um lado foi realizado avaliação clínica e outro histopatológica, aleatoriamente. Durante o período experimental, realizaram-se avaliações e coletas para exame histopatológico nos dias 0, 3, 7, 14 e 21, e curativos diários no GC e troca de pele, a cada 3 dias no GPR. Observou-se o preenchimento total do leito da ferida por tecido de granulação no 14º dia, nos dois grupos e epitelização evidente em ambos grupos no 21º dia. As menores médias das áreas das feridas e as maiores taxas de contração foram observadas no GPR até o 7º dia. No entanto, nas aferições seguintes, o GC apresentou menores médias de área e maiores taxas de contração. Na avaliação histopatológica o GPR apresentou maior fibroplasia e neovascularização precoce até o 7º dia, mas posteriormente, notou-se essas características mais acentuadas no GC. Não foram observadas diferenças estatísticas entre os grupos estudados. De acordo com os resultados obtidos, a pele de rã possui precoce neovascularização e fibroplasia, podendo ser um potencial curativo biológico temporário em equinos.
OLIVEIRA, ANDRESSA B.; FAGUNDES, JESSYCA L.A.; VEADO, HENRIQUE C.; FORTES, BEATRIZ N.A.; BITTENCOURT, ALEXANDRA A.; ADORNO, JOSE; CASTRO, MARCIO B.; VASQUEZ, PABLO A.S.; SANTOS, PAULO S.; DALLAGO, BRUNO S.L.; CAMPEBELL, RITA C.
Uso de pele de rã na cicatrização de feridas em equinos.
In:
SIMPOSIO INTERNACIONAL DO CAVALO ATLETA, 5.,
April 26-30, 2021,
Online.
Abstract...
Belo Horizonte, MG: EV-UFMG,
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32683. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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GOMES, ALISSANDRA de M.
; JESUS, GUSTAVO P.P. de
; ZACARIAS, ENIO A.
; YOSIDAKI, VANESSA L.
; LIMA, DARLE B. de
; COSTA, RAFAEL S.
; RANGEL, ERIKA B.; SOUSA, POLIANA E.S.; SILVA, CHRISTIAN S.; BARTOLINI, PAOLO
; PERONI, CIBELE N.
.
A comparison between two populations of mesenchymal stem cells that can improve the osteogenesis imperfecta mouse phenotype.
In: CONGRESS OF THE BRAZILIAN SOCIETY FOR CELL BIOLOGY, 20th,
January 27-29, 2021,
Online.
Abstract...
São Paulo, SP: Sociedade Brasileira de Biologia Celular,
2021.
p. 249-250.
Abstract:
Osteogenesis imperfecta (OI) is an inherited disease characterized by fragility,
deformity and low bone density, besides other clinical manifestations. Type-I OI is
the mildest and most common form of the disease, caused by a mutation in the
COL1A1 gene and resulting in half normal-collagen production. Our purpose was to
compare mesenchymal stem cells from bone marrow (BM-MSCs) with those from
adipose tissue (AD-MSCs), both used for improving heterozygous oim mice
phenotype, similar to human type-I OI. Mice were irradiated and cells injected into
femoral condyles, bone mineral density (BMD) and femoral length were measured
by X-ray, at the beginning and end of the assay. Femurs and quadriceps allowed
bone fragility evaluation by biomechanical test and collagen Col1a1 and Col1a2
quantification via ELISA. BMD showed no significant difference between the groups,
while femur length variation was higher in the BM-MSCs group, compared with the
control (P=0.0301). Fragility was improved with AD-MSCs when flexion extension
to fracture (P=0.0028) and time to fracture (P=0.0032) were evaluated. There was
no significant difference in the maximum load supported by femurs until fracture.
An increase in Col1a1 concentration with BM-MSCs in comparison with AD-MSCs
(P=0.0281) was obtained. Although no significant difference in Col1a2
concentration was observed between the groups, a higher expression level was
obtained with AD-MSCs. We can thus conclude that AD-MSCs were more efficient
than BM-MSCs for improving bone quality in type-I OI.
GOMES, ALISSANDRA de M.; JESUS, GUSTAVO P.P. de; ZACARIAS, ENIO A.; YOSIDAKI, VANESSA L.; LIMA, DARLE B. de; COSTA, RAFAEL S.; RANGEL, ERIKA B.; SOUSA, POLIANA E.S.; SILVA, CHRISTIAN S.; BARTOLINI, PAOLO; PERONI, CIBELE N.
A comparison between two populations of mesenchymal stem cells that can improve the osteogenesis imperfecta mouse phenotype.
In:
CONGRESS OF THE BRAZILIAN SOCIETY FOR CELL BIOLOGY, 20th,
January 27-29, 2021,
Online.
Abstract...
São Paulo, SP: Sociedade Brasileira de Biologia Celular,
2021.
p. 249-250.
Disponível em: http://repositorio.ipen.br/handle/123456789/32682. Acesso em: $DATA.
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IZQUIERDO, J.; SILVA, R.M.P. da
; MILAGRE, M.X.
; COSTA, I.
; BETANCOR-ABREU, A.M.; SOUTO, R.M..
Microelectrochemical evaluation of severe localized corrosion sites developing on third-generation aluminium alloys.
In: CURRENT TRENDS IN ELECTROCHEMISTRY; MEETING OF THE ELECTROCHEMISTY GROUP OF THE SPANISH ROYAL SOCIETY OF CHEMISTRY, 41st; FRENCH‐SPANISH ATELIER/WORKSHOP ON ELECTROCHEMISTRY, 1st,
July 6-9, 2021,
Paris, France.
Abstract...
2021.
p. 89-89.
Abstract:
Third-generation aluminium-copper-lithium alloys exhibit attractive mechanical properties, in
particular light-weight and significant strength. However, the developed microstructure often
results in severe localized corrosion (SLC) sites with fast in-depth pit propagation
accompanied by H2 evolution.1 Such phenomena stem from a strong galvanic coupling,
mainly established between Fe- and Cu-rich particles and the surrounding matrix. As a result,
strong concentration and pH gradients develop throughout the aluminium surface,
determining the local breakdown of the passive regime eventually provided by aluminium
oxides and corrosion products. Understanding the development of such distributions is key to
outline appropriate strategies for the prevention of fast degradation and materials failure.
Scanning Electrochemical Microscopy (SECM) and Scanning Vibrating Electrode Technique
(SVET) are capable of providing local information on the distribution of active sites and the
presence of reactive chemical species. SVET has previously demonstrated the formation of
gas bubbles ascribed to hydrogen evolution (i.e., electro-reduction process) at the anodically-activated
sites,2,3; whereas local hydrogen production, oxygen consumption and pH changes
are readily accessible using SECM, although with some limitations with regards to the
detection of evolving gas.4
The present contribution reports recent advances in the investigation of local degradation
phenomena occurring at the surface of Al-Cu-Li alloy AA-2098, as bare material and after
friction stir welding. Oxygen consumption over nobler particles acting as cathodic sites, and
SLC accompanied with strong acidification and H2 production at the local anodes were
observed. The determined pH and concentration gradients allow to progress in the knowledge
of the mechanistic aspects involved in the degradation processes on these materials.
IZQUIERDO, J.; SILVA, R.M.P. da; MILAGRE, M.X.; COSTA, I.; BETANCOR-ABREU, A.M.; SOUTO, R.M.
Microelectrochemical evaluation of severe localized corrosion sites developing on third-generation aluminium alloys.
In:
CURRENT TRENDS IN ELECTROCHEMISTRY; MEETING OF THE ELECTROCHEMISTY GROUP OF THE SPANISH ROYAL SOCIETY OF CHEMISTRY, 41st; FRENCH‐SPANISH ATELIER/WORKSHOP ON ELECTROCHEMISTRY, 1st,
July 6-9, 2021,
Paris, France.
Abstract...
2021.
p. 89-89.
Disponível em: http://repositorio.ipen.br/handle/123456789/32681. Acesso em: $DATA.
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-
JACOVONE, RAYNARA M.S.
; JESUS, JULIANA M.S. de; SAKATA, SOLANGE K.
; RICARDO, ELIO C..
Uso do Kahoot! como ferramenta avaliativa em um ambiente interdisciplinar e remoto: primeiras impressões.
In: CARMO, CAROLINA (Ed.); RANGEL, FERNANDA (Ed.); RIBEIRO, RAPHAEL de A. (Ed.); QUARTO, LUCAS C. (Ed.); SOUZA, THAIS C. de (Ed.) CONGRESSO NACIONAL DE ENSINO CIENTIFICO, 2.,
15-18 de julho, 2021,
Online.
Resumo...
Macaé, RJ: Congresse.Me,
2021.
Abstract:
O presente estudo visa apresentar as primeiras impressões observadas
após o uso da plataforma on-line Kahoot! como ferramenta avaliativa do
processo de aprendizagem ativa da disciplina IPN 0034 – Fundamentos
dos Nanomateriais, integrante do conjunto de disciplinas optativas da
graduação disponibilizadas no Instituto de Pesquisas Energéticas e
Nucleares (IPEN). O curso baseia-se na fundamentação de conceitos
aplicados ao estudo de nanomateriais, tais como síntese, caracterização e
aplicação dessa tecnologia no âmbito científico e industrial. No ano atual,
a disciplina, que ainda está em curso, é ministrada por quatro professores
e quatro monitores do Programa de Aperfeiçoamento de Ensino (PAE),
com 48 alunos dos seguintes cursos: Bacharelado em Biotecnologia
(19%), Engenharia Química (19%), Química (17%), bacharelado em Física
Médica (4%), além de alunos de outras Engenharias, Odontologia e
Ciências Contábeis. Neste contexto, foram previamente selecionadas,
dentro do plano da disciplina, a inserção de ferramentas e estratégias
educacionais que buscam promover um aprendizado ativo. A
heterogeneidade do público-alvo atribui ao curso um caráter
multidisciplinar, além de motivar a atual necessidade de aprimorar a
interação professor-aluno em um ambiente remoto. A título de exemplo, a
disciplina em estudo propõem o uso de ferramentas como Kahoot!
Mentimeter , uso de mapas conceituais e apresentações de posters na
plataforma on-line Wonder . Entre as vantagens da plataforma Kahoot!,
destaca-se a obtenção do desempenho imediato dos alunos. O
questionário foi desenvolvido com questões de múltipla escolha, sendo
apenas uma das alternativas correta, sendo aplicado ao término de cada
aula, pelos monitores da disciplina. A hipótese que está sendo avaliada,
após a execução de cinco aulas, refere-se à observação de que, ao
disponibilizar material para consulta/estudo, antes da aula, os alunos
tiveram um maior/melhor desempenho no Kahoot! As evidências obtidas
até o momento indicam que em aulas que foram apresentadas questões referentes ao conteúdo pré-aula, cerca de 74% a 96% das questões foram
respondidas corretamente. Porém, nas aulas sem material prévio, o
máximo de acertos foi de 48%. Esses dados consideram a participação de
48 a 44 alunos, sem considerar o tempo para resposta das questões, mas
apenas o que foi pontuado como certo e errado. Essa distinção de
desempenho aponta para a importância do aluno estudar ou ter um
contato prévio com o conteúdo que será dado em sala. Destaca-se que a
investigação da efetividade de uma ferramenta no decorrer do curso
permite ao professor aprimorar ou, até mesmo, rever suas escolhas
didáticas propostas no plano de aula, o qual não deve ser engessado, mas
sim dinâmico, em resposta ao grupo de alunos e suas particularidades.
Portanto, é possível identificar que a aplicação de material pré-sala e o
uso do Kahoot! está permitindo avaliar de forma efetiva o desempenho
dos alunos, oferecendo indicadores para avaliar também as práticas do
professor na disciplina em questão.
JACOVONE, RAYNARA M.S.; JESUS, JULIANA M.S. de; SAKATA, SOLANGE K.; RICARDO, ELIO C.
Uso do Kahoot! como ferramenta avaliativa em um ambiente interdisciplinar e remoto: primeiras impressões.
In:
CARMO, CAROLINA (ed.); RANGEL, FERNANDA (ed.); RIBEIRO, RAPHAEL de A. (ed.); QUARTO, LUCAS C. (ed.); SOUZA, THAIS C. de (ed.) CONGRESSO NACIONAL DE ENSINO CIENTIFICO, 2.,
15-18 de julho, 2021,
Online.
Resumo...
Macaé, RJ: Congresse.Me,
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32680. Acesso em: $DATA.
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JACOVONE, RAYNARA M.S.
; JESUS, JULIANA M.S. de; TEIXEIRA, ANTONIO C.S.C.; SAKATA, SOLANGE K.
.
Screen printed electrode modified with reduced graphene oxide obtained by ɤ radiation for levonorgestrel detection.
In: FRONTEIRAS EM ELETROQUÍMICA E ELETROANALÍTICA, 2.: AVANÇOS REALIZADOS POR JOVENS MULHERES CIENTISTAS,
11-12 de fevereiro, 2021,
Online.
Resumo...
Rio de Janeiro, RJ: Universidade Federal do Rio de Janeiro,
2021.
p. 131-132.
Abstract:
INTRODUCTION Screen printed electrodes (SPE) have attracted attention due to their
fast and accurate response, high sensibility, specificity, and portable platforms. To
increase their electrical carrier mobility and sensibility, the working electrode surface has
been modified using reduced graphene oxide (rGO) [1]. In the present work, gamma
radiation reduced Graphene Oxide (GO) to produce rGO in a sustainable method that
avoids toxic reagents and the production of hazardous chemical residues [2].
Levonorgestrel (LNG) is a synthetic contraceptive hormone of worldwide concern, being
harmful to aquatic organisms, even at low concentrations, e.g., 0.024 nmmol L-1 [3].
METHODOLOGY Reduced graphene oxide was obtained using GO (10 mg mL-1)
dispersed in a water/isopropanol. The sample was irradiated in the Multipurpose Gamma
Irradiation Facility at CETER/IPEN/CNEN-SP, at a dose rate of 10 kGy h-1 and 80.0 kGy
in inert conditions. The SPE was modified by drop casting 10 μL of the rGO solution and
dried at room temperature. The rGO-SPE was characterized by Raman spectroscopy and
the electrochemical behavior of LNG was investigated using cyclic voltammetry (CV) in
phosphate buffered saline (PBS) medium (pH 7.0) within the oxidation window 0.0-1.0
V and 25 mV s-1 (Fig. 1).
RESULTS The Raman spectrum showed D (1.347 cm-1) e G (1.594 cm-1) bands for both
rGO-SPE and SPE. The ID/IG ratio was 0.85 and 1.40 for SPE and rGO-SPE, respectively.
For rGO-SPE, cyclic voltammograms showed a reversible behavior in K4Fe(CN)6 [2
mmol L-1] and in the presence of LNG [6410-9 mol L-1], anode inflection was observed
at 0.6 V, associated with the non-reversible oxidation reaction of LNG.
CONCLUSIONS The surface of the rGO-SPE was uniform, being the ID/IG ratio for the
covered electrode higher than that exhibited by the uncovered one. This electrode
presented electrochemical response to LNG, even at low concentrations, thus proving its
application as an electrochemical sensor for the LNG hormone.
JACOVONE, RAYNARA M.S.; JESUS, JULIANA M.S. de; TEIXEIRA, ANTONIO C.S.C.; SAKATA, SOLANGE K.
Screen printed electrode modified with reduced graphene oxide obtained by ɤ radiation for levonorgestrel detection.
In:
FRONTEIRAS EM ELETROQUÍMICA E ELETROANALÍTICA, 2.: AVANÇOS REALIZADOS POR JOVENS MULHERES CIENTISTAS,
11-12 de fevereiro, 2021,
Online.
Resumo...
Rio de Janeiro, RJ: Universidade Federal do Rio de Janeiro,
2021.
p. 131-132.
Disponível em: http://repositorio.ipen.br/handle/123456789/32679. Acesso em: $DATA.
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-
TAVARES, P.V.S.
; RODRIGUES JUNIOR, O.
; CAMPOS, L.L.
.
Application of CT optical system for dose evaluation of Fricke gel solution.
In: ENCONTRO DE FÍSICA DO NORTE E NORDESTE, 35.,
18-20 de outubro, 2021,
Online.
Resumo...
São Paulo, SP: Sociedade Brasileira de Física,
2021.
Abstract:
Objective: This work aims to evaluate the Fricke gel solution as a method for three-dimensional dosimetry using an equipment of optical computed tomography VISTA 16.
Purpose: The technique of optical computed tomography has similarities with X ray CT, the difference is that optical CT utilizes visible light as the photon source. Both optical and X ray CT works with attenuation data acquired at various views through the object to be imaged. Optical computed tomography was developed as an alternative method for evaluating gel solutions for three-dimensional dosimetry [1]. The evaluation by optical computed tomography is performed by measuring the solution before and after irradiation. The application of mathematical algorithm of inverse problems is used for images reconstruction. The reconstructed images are used to evaluate the attenuation variation between before and after irradiation [2]. There is a correlation between attenuation variation and the dose deposited in material. The Fricke gel solution has been changed to become a radiochromic solution, i.e., have the property of undergoing changes in optical density as a function of the deposited dose. The xylenol orange added to the Fricke gel solution becomes a ferric ions (Fe3+) indicator, resulting from the oxidation of ferrous ions (Fe2+) radiation induced [3].
Materials and Methods: For this work it was proposed a solution Fricke gel modified with reduce in xylenol orange concentration for specified use in optical CT. The Fricke gel solution samples were irradiated with 60Co gamma radiation in a Gammacell equipment with isotropic irradiation capacity.
Results: The evaluation in optical CT equipment VISTA 16 results images with alteration in pixel values that correspond to attenuation variation. In images it was possible verify the dose distribution uniformly that corresponds to the isotropic irradiation method.
Conclusions: The Fricke gel solution evaluated in optical CT shows a uniformity of the dose that was applied in the solution, being feasible to be studied for irradiation in radiotherapy equipment looking for its use in treatment planning.
TAVARES, P.V.S.; RODRIGUES JUNIOR, O.; CAMPOS, L.L.
Application of CT optical system for dose evaluation of Fricke gel solution.
In:
ENCONTRO DE FÍSICA DO NORTE E NORDESTE, 35.,
18-20 de outubro, 2021,
Online.
Resumo...
São Paulo, SP: Sociedade Brasileira de Física,
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32678. Acesso em: $DATA.
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ASSUNCAO, ISRAEL; NETO, ALBANO; MOURA JUNIOR, RENALDO; PEDROSO, CASSIO; SILVA, IVAN; FELINTO, MARIA C.
; TEOTONIO, ERCULES; MALTA, OSCAR; BRITO, HERMI.
The influence of the odd-even effect of aliphatic dicarboxylate ligands on the photoluminescent properties of europium complexes.
In: PREQUEL SYMPOSIUM ON ADVANCED TECHNOLOGIES AND MATERIALS,
October 13-15, 2020,
Online.
Abstract...
2020.
Abstract:
Eleven [Eu2(L)3(H2O)x]·y(H2O) complexes with aliphatic dicarboxylate ligands (L:
OXA, MAL, SUC, GLU, ADP, PIM, SUB, AZL, SEB, UND, and DOD, where x=2–6 and y=0–4)
were synthesized and characterized by elemental and thermal analysis, FTIR
spectroscopy and powder X-ray diffraction. The obtained data confirms the ligand to
metal ratio, the hydration degree, the coordination mode and that the complexes are
crystalline. The oddeven effect was observed for the final dehydration temperature of the
Eu3+ complexes (Fig. 1). Moreover, the effect was also observed in the experimental and
theoretical photoluminescent properties such as the intensity parameters, Ω2 and Ω4 (Fig.
2) and the emission intrinsic quantum yield, QLnLn (Fig. 3) of the Eu3+ complexes. The odd-even
effect on the Ω2 and Ω4 values could be explained by using an extension of the
dynamic coupling mechanism, herein named the ghost-atom (GA) model, in which the
long-range polarizabilities (α*) were determined by simulating the presence of a ghost
atom in the middle of each ligand carbon chain and the localized molecular orbital
approach. The GA approach is an extension of the Bond Overlap Model (BOM) [1].
ASSUNCAO, ISRAEL; NETO, ALBANO; MOURA JUNIOR, RENALDO; PEDROSO, CASSIO; SILVA, IVAN; FELINTO, MARIA C.; TEOTONIO, ERCULES; MALTA, OSCAR; BRITO, HERMI.
The influence of the odd-even effect of aliphatic dicarboxylate ligands on the photoluminescent properties of europium complexes.
In:
PREQUEL SYMPOSIUM ON ADVANCED TECHNOLOGIES AND MATERIALS,
October 13-15, 2020,
Online.
Abstract...
2020.
Disponível em: http://repositorio.ipen.br/handle/123456789/32677. Acesso em: $DATA.
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FRANCISCO, LEONARDO
; FELINTO, MARIA
; BRITO, HERMI.
Development of rare-earth-doped hybrid materials towards luminescence enhancement.
In: PREQUEL SYMPOSIUM ON ADVANCED TECHNOLOGIES AND MATERIALS,
October 13-15, 2020,
Online.
Abstract...
2020.
Abstract:
The rapid growth on the development of rare-earth-doped luminescent materials
has been drawing attention due to complex energy converting systems that can be
structurally engineered to tune absorption and emission wavelengths, outlining new
materials and applications for photonics. [1, 2] In this scenario, this work presents the
development of rare-earth-doped strontium aluminate phosphors prepared by the
Pechini method and modified with 3-aminopropyltrimethoxysilane via
microwaveassisted synthesis, integrating a silica network with rare-earth β-diketonate
complexes in order to enhance the absorption section and promote energy-transfer
processes within the system. The prepared materials were analyzed by X-ray powder
diffraction, where a characteristic monoclinic SrAl2O4: Eu2+, Dy3+ phase with crystallite
size around 30 nm was observed. Several structural changes attributed to surface
modification were also noted. Scanning Electron Microscopy images and Energy-
Dispersive X-ray Spectroscopy results revealed the expected surface alteration effects, as
well as the element mapping throughout the samples. Standard UV-Vis and Vacuum-UV
Luminescence Spectroscopies were also performed. The optical behavior of the
synthesized materials was characterized by green Eu2+ emission assigned to the
4f65d1→4f7(8S7/2) interconfigurational transition under near-ultraviolet excitation
alongside narrow 4f-4f transitions of non-reduced Eu3+. Furthermore, in functionalized
samples, S0→Sn transitions attributed to β-diketonate ligands were also observed,
unveiling an increasing absorption section under ultraviolet light. Finally, it was noted a
significant increase in the persistence decay time under near Band-Gap excitation in
modified materials, suggesting interactions between the inorganic host-matrix, the silica
network, and the β-diketonate complexes.
FRANCISCO, LEONARDO; FELINTO, MARIA; BRITO, HERMI.
Development of rare-earth-doped hybrid materials towards luminescence enhancement.
In:
PREQUEL SYMPOSIUM ON ADVANCED TECHNOLOGIES AND MATERIALS,
October 13-15, 2020,
Online.
Abstract...
2020.
Disponível em: http://repositorio.ipen.br/handle/123456789/32676. Acesso em: $DATA.
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FELINTO, M.C.F.C.
; ALI, B.
; FRANCISCO, L.H.C.
; BLOIS, L.; BRITO, H.F.; MALTA, O.L.; TEOTONIO, E.E.S..
Synthesis and luminescent properties of three new and bright Eu - tta compounds modified on α-carbon for use as biological markers.
In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th,
July 26-30, 2021,
Changchun, China.
Abstract...
2021.
Abstract:
Three smarts luminescent Eu3+ complexes (Eu1 = Eu(tta-ester)3phen 1, Eu2 = Eu(tta-
NH2)3phen 2, Eu3 = Eu(tta-COOH)3phen, were synthesized by using phenanthroline as
the neutral ligand and Cα modified 2-thenoyltrifluoroacetonate and as the anionic
ligand. All the Eu(III) complexes were structurally characterized by spectroscopic
methods. Photoluminescence (PL) emission spectra of Eu complexes showed red color
emission in the solid state. These materials were analyzed by X-ray diffraction,
scanning electron microscopy and by energy dispersive, ultraviolet–visible
spectroscopy, luminescence and vacuum ultraviolet–ultraviolet spectroscopies.The
spectra show several sharp emission bands ranging from 450 to 750 nm due to the 4f–
4f transition from the excited state 5D0 to the low-lying multiple level 7FJ (J = 0, 1, 2, 3
and 4) of the Eu3+ ion. The five main sharp emission peaks were observed at
wavelengths of c.a. 579, 591, 613, 653 and 702 nm, which are attributed to the f–f
electronic transitions of the Eu(III) ion (5D0 → 7F0, 5D0 → 7F1, 5D0 → 7F2, 5D0 → 7F3
and 5D0 → 7F4, respectively). These complexes were evaluated also in terms of high
energy.VUV-UV emission spectra present the 5D0→7F2 the transition dominating the spectrum
under excitation at higher energies (Fig.1).
FELINTO, M.C.F.C.; ALI, B.; FRANCISCO, L.H.C.; BLOIS, L.; BRITO, H.F.; MALTA, O.L.; TEOTONIO, E.E.S.
Synthesis and luminescent properties of three new and bright Eu - tta compounds modified on α-carbon for use as biological markers.
In:
INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th,
July 26-30, 2021,
Changchun, China.
Abstract...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32675. Acesso em: $DATA.
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FRANCISCO, L.H.C.
; MOREIRA, R.P.
; BRITO, H.F.; TEOTONIO, E.E.S.; MALTA, O.L.; FELINTO, M.C.F.C.
.
Luminescence of Eu(tta)3(N-picNO)2 (N=2, 3 and 4) doped PMMA films under Synchrotron radiation.
In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th,
July 26-30, 2021,
Changchun, China.
Abstract...
2021.
Abstract:
Since their discovery, trivalent lanthanide β-diketonate complexes often stand out
among luminescent coordination compounds [1]. Thus, the incorporation of such
complexes into polymeric materials proposes increased photostability, optical quality,
and processing conditions [2]. In this work, we prepared and doped the luminescent
Eu(tta)3(N-picNO)2 (N=2, 3 and 4) complexes into Poly(methyl methacrylate) (PMMA)
films via the solvent casting method, yielding transparent materials under visible light.
These amorphous materials (XRD) presented considerable thermal stability up to
300°C (TGA), and their spectroscopic properties with ancillary ligand exchange were
investigated by luminescence spectroscopy in the UV-Vis and Vacuum-UV energy
range by synchrotron radiation. Mainly, Eu3+ transitions (5D0→7F0-4) were observed in
the emission spectra for all compounds, with intense monochromatic-like red (614 nm)
emission (Fig. 1), indicating efficient intramolecular energy transfer. Experimental
intensity parameters and quantum yields were also determined, where it is seen the
influence on the positioning of the methyl group in the luminescence efficiency.
FRANCISCO, L.H.C.; MOREIRA, R.P.; BRITO, H.F.; TEOTONIO, E.E.S.; MALTA, O.L.; FELINTO, M.C.F.C.
Luminescence of Eu(tta)3(N-picNO)2 (N=2, 3 and 4) doped PMMA films under Synchrotron radiation.
In:
INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th,
July 26-30, 2021,
Changchun, China.
Abstract...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32674. Acesso em: $DATA.
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MOREIRA, R.P.
; FRANCISCO, L.H.C.
; BRITO, H.F.; MALTA, O.L.; TEOTONIO, E.E.S.; FELINTO, MARIA C.F.C.
.
Eu3+-doped BaMO4 (M: W or Mo) luminescent materials for lighting applications prepared by coprecipitation method.
In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th,
July 26-30, 2021,
Changchun, China.
Abstract...
2021.
Abstract:
This work presents the development and investigation of the structural, spectroscopic,
and electronic properties of Eu3+-doped BaMO4 (M: W or Mo) compounds obtained by
the coprecipitation method, at room temperature, targeting applications in phosphor-converted
Light-Emitting Diode (pc-LEDs) lighting devices [1,2]. A systematic study
was performed to determine optimal doping concentrations in order to obtain high-intensity
monochromatic-like luminescence with efficient lanthanide quantum yield for
red light emission. Structural analysis by X-Ray Powder Diffraction showed a stable
characteristic scheelite-type structure for all of the studied compounds, with no phase
segregation, as confirmed by Rietveld Refinement, whereas average crystallite size was
estimated to be about 30 nm. Morphology and elemental distribution were probed by
Scanning Electron Microscopy coupled with Energy dispersive X-ray spectroscopy,
where homogeneous europium distribution was identified even at high doping
concentrations (up to 10% molar). The optical behavior of the prepared materials was
studied by Diffuse Reflectance Spectroscopy and Luminescence Spectroscopy in the
UV-Vis range, displaying characteristic red emission, together with the nephelauxetic
effect associated with spectral red-shifts attributed to structural distortions around the
Eu3+ ion and significant (LMCT) contribution. The intensity parameters Ω2,4 and
lanthanide quantum yield QLn
Ln of all Eu-doped materials were also determined.
Furthermore, the CIE color diagram was investigated, showing the rate of greenish-blue
host matrix contribution ([WO4]2- or [MoO4]2-) and Eu3+ luminescence in different
compounds.
MOREIRA, R.P.; FRANCISCO, L.H.C.; BRITO, H.F.; MALTA, O.L.; TEOTONIO, E.E.S.; FELINTO, MARIA C.F.C.
Eu3+-doped BaMO4 (M: W or Mo) luminescent materials for lighting applications prepared by coprecipitation method.
In:
INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th,
July 26-30, 2021,
Changchun, China.
Abstract...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32673. Acesso em: $DATA.
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PARRA, DUCLERC F.
; MARCHINI, LEONARDO G.
; FELINTO, MARIA C.
; BRITO, HERMI F..
Photoluminescent properties of the polyamide /Eu3+ β-diketonate complex for optical application.
In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th,
July 26-30, 2021,
Changchun, China.
Abstract...
2021.
Abstract:
The Eu3+ complex precursor, the polymeric (PA) optical marker and the plastic
luminescent films obtained were characterized by infrared spectroscopy (FTIR), X-Ray
diffractometry (DRX), emission spectroscopy, and thermogravimetry (TGA). The
emission spectra of the Eu3+–tta complex doped in the PA exhibited the characteristic
bands arising from the 5D0 → 7FJ transitions (J = 0-4). High values of the Ω2 intensity
parameter were obtained, indicating the hypersensitive character of the 5D0 → 7F2
transitions and the Eu3+ ions are in a polarizable chemical environment. The high values
of the Ω4 parameter confirm the basicity of the oxygen donor from the polymer.
Lifetime measurement suggests that doped Eu3+ ion has higher luminescence efficiency
in the film than hydrated complex. The emission quantum efficiencies (η) and the
highest value are observed in the system PA:[Eu(tta)3(H2O)2] 5%. The PA-optical
marker resulted a luminescent plastic film, with high stability when processing.
PARRA, DUCLERC F.; MARCHINI, LEONARDO G.; FELINTO, MARIA C.; BRITO, HERMI F.
Photoluminescent properties of the polyamide /Eu3+ β-diketonate complex for optical application.
In:
INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th,
July 26-30, 2021,
Changchun, China.
Abstract...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32672. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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ASSUNCAO, I.P.; BRITO, H.F.; FELINTO, M.C.F.C.
; TEOTONIO, E.E.S.; MALTA, O.L..
A new series of luminescent tetrakis Ln3+-complexes with α-substituted β-diketonate ligands and Na+ as countercation.
In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th,
July 26-30, 2021,
Changchun, China.
Abstract...
2021.
Abstract:
The Ln3+ β-diketonate coordination compounds have received growing attention in the
past few years, mainly due to their inherent huge variety of applications. The tris and
tetrakis species have also been widely used as an emitting layer in organic light-emitting
diodes (OLEDs) due to their high intensity and monochromatic emission. The
tetrakis complexes usually present improved properties such as thermal and chemical
stabilities, besides higher luminescence lifetimes than its correspondent tris complexes.
Moreover, the commonly hydrated tris Ln3+-complexes show a luminescence
quenching due to vibronic coupling between H2O molecules and the Ln3+ principal
emitting levels (e.g., 4G5/2, 5D0, 5D4,
4F9/2 and 1G4 of the Sm3+, Eu3+, Tb3+, Dy3+ and Tm3+
ions, respectively) [1]. The acetylacetone (2,4-pentanedione) ligand, Hacac, is one of
the most extensively used and studied β-diketonate ligands, especially for the Tb3+ ion.
Nevertheless, the α-substituted Ln3+ β-diketonate complexes are relatively scarce in the
literature [2]. Hence, this work reports the synthesis, characterization, and
photoluminescent study of a new series of tetrakis coordination compounds containing
the α-substituted β-diketonates 3-chloro acetylacetone (Cl-acac), presenting the general
formula Na[Ln(Cl-acac)4], where Ln: Sm3+, Eu3+, Tb3+, Dy3+, and Tm3+.
All complexes were characterized by elemental analysis,
complexometric titration, thermal analysis, infrared
absorption spectroscopy (FTIR), and X-ray powder
diffraction (XPD). The Ln3+ complex photoluminescent
properties (Figure 1) as well as the experimental intensity
parameters (Ω2,4) of the Eu3+ were determined.
ASSUNCAO, I.P.; BRITO, H.F.; FELINTO, M.C.F.C.; TEOTONIO, E.E.S.; MALTA, O.L.
A new series of luminescent tetrakis Ln3+-complexes with α-substituted β-diketonate ligands and Na+ as countercation.
In:
INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th,
July 26-30, 2021,
Changchun, China.
Abstract...
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32671. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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A pesquisa no RD utiliza os recursos de busca da maioria das bases de dados. No entanto algumas dicas podem auxiliar para obter um resultado mais pertinente.
✔ É possível efetuar a busca de um autor ou um termo em todo o RD, por meio do
Buscar no Repositório
, isto é, o termo solicitado será localizado em qualquer campo do RD. No entanto esse tipo de pesquisa não é recomendada a não ser que se deseje um resultado amplo e generalizado.
✔ A pesquisa apresentará melhor resultado selecionando um dos filtros disponíveis em
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✔ Os filtros disponíveis em
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tais como: Coleções, Ano de publicação, Títulos, Assuntos, Autores, Revista, Tipo de publicação são autoexplicativos. O filtro,
Autores IPEN
apresenta uma relação com os autores vinculados ao IPEN; o
ID Autor IPEN
diz respeito ao número único de identificação de cada autor constante no RD e sob o qual estão agrupados todos os seus trabalhos independente das variáveis do seu nome;
Tipo de acesso
diz respeito à acessibilidade do documento, isto é , sujeito as leis de direitos autorais, ID RT apresenta a relação dos relatórios técnicos, restritos para consulta das comunidades indicadas.
A opção
Busca avançada
utiliza os conectores da lógica boleana, é o melhor recurso para combinar chaves de busca e obter documentos relevantes à sua pesquisa, utilize os filtros apresentados na caixa de seleção para refinar o resultado de busca. Pode-se adicionar vários filtros a uma mesma busca.
Exemplo:
Buscar os artigos apresentados em um evento internacional de 2015, sobre loss of coolant, do autor Maprelian.
Autor: Maprelian
Título: loss of coolant
Tipo de publicação: Texto completo de evento
Ano de publicação: 2015
✔ Para indexação dos documentos é utilizado o Thesaurus do INIS, especializado na área nuclear e utilizado em todos os países membros da
International Atomic Energy Agency – IAEA
, por esse motivo, utilize os termos de busca de assunto em inglês; isto não exclui a busca livre por palavras, apenas o resultado pode não ser tão relevante ou pertinente.
✔ 95% do RD apresenta o texto completo do documento com livre acesso, para aqueles que apresentam o
significa que e o documento está sujeito as leis de direitos autorais, solicita-se nesses casos contatar a Biblioteca do IPEN,
bibl@ipen.br
.
✔ Ao efetuar a busca por um autor o RD apresentará uma relação de todos os trabalhos depositados no RD. No lado direito da tela são apresentados os coautores com o número de trabalhos produzidos em conjunto bem como os assuntos abordados e os respectivos anos de publicação agrupados.
✔ O RD disponibiliza um quadro estatístico de produtividade, onde é possível visualizar o número dos trabalhos agrupados por tipo de coleção, a medida que estão sendo depositados no RD.
✔ Na página inicial nas referências são sinalizados todos os autores IPEN, ao clicar nesse símbolo
será aberta uma nova página correspondente à aquele autor – trata-se da página do pesquisador.
✔ Na página do pesquisador, é possível verificar, as variações do nome, a relação de todos os trabalhos com texto completo bem como um quadro resumo numérico; há links para o Currículo Lattes e o Google Acadêmico ( quando esse for informado).
ATENÇÃO!
ESTE TEXTO "AJUDA" ESTÁ SUJEITO A ATUALIZAÇÕES CONSTANTES, A MEDIDA QUE NOVAS FUNCIONALIDADES E RECURSOS DE BUSCA FOREM SENDO DESENVOLVIDOS PELAS EQUIPES DA BIBLIOTECA E DA INFORMÁTICA.
O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.
A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.
1. Portaria IPEN-CNEN/SP nº 387, que estabeleceu os princípios que nortearam a criação do RDI,
clique aqui.
2. A experiência do Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) na criação de um Repositório Digital Institucional – RDI,
clique aqui.
O Repositório Digital do IPEN é um equipamento institucional de acesso aberto, criado com o objetivo de reunir, preservar, disponibilizar e conferir maior visibilidade à Produção Científica publicada pelo Instituto, desde sua criação em 1956.
Operando, inicialmente como uma base de dados referencial o Repositório foi disponibilizado na atual plataforma, em junho de 2015. No Repositório está disponível o acesso ao conteúdo digital de artigos de periódicos, eventos, nacionais e internacionais, livros, capítulos, dissertações, teses e relatórios técnicos.
A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.
O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.