DALTON GIOVANNI NOGUEIRA DA SILVA

DALTON GIOVANNI NOGUEIRA DA SILVA

Página do item completo

Resultados de Busca

Agora exibindo 1 - 10 de 46

Multi-elemental analysis by FRXDE on pollen produced by the native bee Scaptotrigona aff. Fake
2023 - GIOVANNI, DALTON N. da S.; ZAMBONI, CIBELE B.; PECEQUILO, BRIGITTE R.S.; ALIFIO-ESPOSITO, SELENE; PIMENTA, DANIEL C.; SIMONS, SIMONE M.
Brazil is one of the largest suppliers of bee products in the world. It is currently the 5th largest exporter of honey and derivatives and a significant part of its production originates from the south and northeast. Specifically, the species Scaptotrigona aff. Postica, from the region of Barra do Corda in the State of Maranhão (MA), produces pollen which is one of the main activities of the local economy (food supplement). However, there are no data on its mineral composition, although there is a history of applications in the nutritional field. In this context, this research aims to generate integrated and interdisciplinary knowledge of the pollen produced by this pollinating species, through multi-element investigation (identification and quantification of chemical elements) using the Energy Dispersive X-ray Fluorescence (XRF) technique. The elemental composition of pollen emphasizes its nutritional relevance (Ca, Cl, Fe, K, Mn and P) and the results of the concentrations showed little seasonal variation, serving as a model for the safe expansion of meliponiculture in the region. In the technological sphere, this analysis is a tool for tracking (provenance), which allows the identification of fraud and/or adulteration, in addition to adding quality control to its commercialization.
X- ray experimental set-up for in-vitro nail test
2023 - ZAMBONI, C.B.; GIOVANNI, D.N.S.; ALMEIDA, M.R.; TODO, A.S.; SABARA, F.; RODRIGUES JUNIOR, O.
In this investigation, the elements Ca and S were evaluated in a single nail clipping using compact and portable X-ray spectrometer model X-123 SDD with Ag target. Experimental conditions for current, voltage and excitation time were investigated. These analyses can be useful for a variety of applications, including nutritional and medical diagnosis, such as, the evaluation of bone dysfunctions by measurement of Ca (bone decalcification) and S for nutrition evaluations (collagen production). This analysis offers some benefits comparatively to blood and serum analyses, such as, non-invasive collection, fast analyses (minutes) and low cost. In addition, nail clippings are simple to obtain, easy to store, and easy to transport. This pilot study show a positive expectation for clinical application using in-vitro nail test.
X-ray investigation of graphic art
2023 - SILVA, ANA C.K. de S.; ZAMBONI, CIBELE B.; SILVA, DALTON G.N. da
X-rays produced by electron ionization provide an analytical tool that can assist investigations in the field of Artistic and Cultural Heritage. In this study, the technique of Energy Dispersive X-ray Fluorescence (EDXF) was employed to investigate collections of postcards from the 1960s produced in Brazil, London and Uruguay. The collections belong to private collections and were made available for analysis at the Radiation Spectroscopy and Spectrometry Laboratory of the Institute for Nuclear and Energy Research (IPEN). This technique is non-destructive and allows the identification of chemical elements present in the different chemical formulations used in the printing industries of each country in the process of preparing postcards. This information allows tracing their origin and identifying copies/fakes, which enables their cataloging and registration for exhibition, as well as providing subsidies for conservators and restorers regarding the preservation and storage of these artistic materials.
Study on the radiation exposure of Portable X-ray Fluorescence
2023 - DIAS, F.S.; GIOVANNI, D.N.S.; POTIENS JUNIOR, A.J.; RODRIGUES JUNIOR, O.; POTIENS, M.P.A.; ZAMBONI, C.B.
Young Scientist Project presents Neutron Life
2023 - ZAMBONI, CIBELE B.; GIOVANNI, DALTON N.S.; KOKA, ANA C.; STANOJEV, MARCO
The Young Scientist Project was created in 2019, by the team of the Spectroscopy and Spectrometry of Radiation Laboratory (LEER/IPEN), with the proposal to implement nuclear knowledge in academia and for the general public. The objective is to develop alternative proposals for knowledge, application and dissemination of nuclear physics using social networks. The website www.jovemcientista.com.br design involves four menus: REPORTS where researchers talk about their career and perspectives in the field; NUCLEAR MINUTE: where nuclear physics concepts are covered in one-minute videos; CURIOSITIES: a space where various themes are presented, including several nuclear applications; INTERVIEWS: conducted by students to discuss its work and a COMMUNICATION CHANNEL with the entire team. All activities involve the participation of students from scientific initiation to post-doc and the content produced is available on social networks YouTube (Jovem Cientista), Instagram (@jovemcientista.com.br) associated with a Facebook page Facebook (@jovemcientista.com.br), TikTok (@jovemcientista.com.br) and by LinkedIn and Twitter in the editors’; profile. Now, we are present a new menu NEUTRON LIFE whose content is produced mainly for graduate students. The idea is to present topics related to neutron physics in a relaxed way, through the elaboration of videos and comic strips. Since the implementation of the Young Scientist Project, interaction with students and the public has been positive, helping to demystify and disseminate nuclear physics.
Multi-analytical X-ray study of the honorary decoration of the Order of Christ
2023 - ZAMBONI, CIBELE B.; SILVA, DALTON G.N. da; BOGNAR, MARTA L.; SILVA NETO, GALDINO V. da
The analysis of cultural heritage objects can generate information about techniques of minting of the time, giving information not only on chronology but also regarding preparation methodology, and provenance. In this investigation, three honorable mentions (metal artifacts) of the order of Christ (cross, lady's and gentlemen's medal) were performed using Energy Dispersive X-ray Fluorescence (EDXRF) technique. This analysis were performed with a portable Amptek assemble of Si-drift XR-100SSD (25 mm2 × 500 μm) detector, equipped with a 12.5 μm Be entrance window, pre-amplifier and digital pulse multichannel processor and Ag target. Analytical parameters were 5 μA and 30 kV for 180 s at 2 mm distance to the target. Points distributed in distinct parts were analyzed in each of the metal artifact. The WinQxas software was employed for spectral analyses. These data provide to curators and historians knowledge for cataloging and subsidies for correct storage. In addition, they can be used to identify forgeries (heritage appreciation).
Multielemental characterization of the pollen produced by Scaptotrigona aff postica bee from Brazil using EDXRF technique
2023 - SILVA, DALTON G.N. da; ZAMBONI, CIBELE B.; PECEQUILO, BRIGITTE R.S.; ESPOSITO, SELENE E.; PIMENTA, DANIEL C.; SIMONS, SIMONE M.
The objective of this investigation was to perform a multielemental characterization of the pollen produced by Scaptotrigona aff Postiça Bee (popularly known as “tubi”). In recent years, the demand for natural and healthy products has grown significantly and products from Meliponiculture (creation of stingless bees) have started to be consumed on a larger scale in Brazil. Specifically, pollen has gained prominence in the nutritional field for being a protein source and rich in carbohydrates, lipids, mineral trace elements, fibers, hormones and vitamins, but scientific research is still scarce, especially regarding studies of its specific composition. The aim of this investigation was to evaluate the content of inorganic elements (multielemental analysis) in pollen from “tubi” bees. Pollen samples were collected during a one year, in a meliponary of Barra do Corda city, in the state of Maranhão. The EDXRF analyzes were carried out using an X-Ray Fluorescence spectrometer (X-123SDD, Amptek), constituted by a Silicon detector coupled a mini X-ray tube (Ag). These data are the first estimates of mineral trace elements in this natural product and provide benefits to beekeepers regarding their characteristic specifications. In addition contributes with relevant data in the nutritional field.
Application of the X-ray fluorescence analysis to determine the elemental composition of Brazilian Olympic coins
2023 - SILVA, ANA C.K. de S.; ZAMBONI, CIBELE B.; ALMEIDA, MATEUS R. de; SILVA, DALTON G.N. da
In this investigation, the elemental composition of Brazilian Olympic coins was investigated using Energy Dispersive X-ray Fluorescence (EDXRF) analytic technique. From the release of Olympic albums (2014, 2015, and 2016) the demand for these coins has increased and some can be worth up to 7000% more than their normal value. The analysis was performed using a compact X-ray spectrometer model X-123 SDD with Ag target. The characteristic X-ray fluorescent intensity of Ka lines were measured with a Si Drift detector (25 mm² x 500 μm) with Be window (12.5 μm). For the spectrometer calibration, certified standard solutions from Z = 14 to Z = 51 were evaluated. The results were compared with coins in current circulation. All the spectral analysis was performed using WinQxas software. The spectral analysis of Olympic coins shows Cr, Mn, Fe and Cu as majorities and peaks of various elements as traces. The 2014 and 2015 Olympic coins groups exhibited similar surface compositions for majorities and trace elements (V, Ni, Mo, Ag, In, Sn, Ce, Nd, Ir and Pb), while the 2016 group coins exhibited Nb presence as a trace element. Some differences were also identified when the comparison was made with current coins. These data provide curators with information for cataloging as well as being used to identify forgeries (heritage appreciation), important for collectors.
Uso de mini-espectrômetro de fluorescência de raios X como alternativa para a prática clínica de dialisados
2023 - SOUZA, CATARINA da S.; ZAMBONI, CIBELE B.; MOURA, LARISSA A.S.; METAIRON, SABRINA; SILVA, DALTON G.N. da
Neste estudo, o uso de equipamento compacto e portátil, baseado na tecnologia de Fluorescência de Raios X, foi empregado para execução de análises bioquímicas (dosagens de íons) em microamostras de fluidos corpóreos depositadas em papel. Foi realizada a análise simultânea de íons de relevância clínica e nutricional (Ca, Cl, Fe, K, P e S), em sangue total de pacientes com insuficiência renal crônica (IRC) submetidos a tratamento dialítico. Durante a investigação as concentrações obtidas em sangue total levaram a resultados que corroboram com o quadro clínico obtido pelas análises convencionais. Com os dados do presente foi possível elaborar uma discussão sobre a viabilidade de uso deste equipamento para a realização desses exames bioquímicos em Unidades Básicas de Saúde Fluviais (UBSF), gerando melhorias na qualidade de vida de populações ribeirinhas, bem como no âmbito econômico em função de sua aplicabilidade com menor custo. Descritores: Íons, Sangue, Análise Clínica.
Ions and metal dosage in human health
2022 - ZAMBONI, CIBELE B.; METAIRON, SABRINA; GIOVANNI, DALTON N.S.; MEDEIROS, JOSE A.G. de; AZEVEDO, MARIA R.