ADRIANA RAMOS DE MIRANDA

ADRIANA RAMOS DE MIRANDA

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Random lasers
2023 - WETTER, NIKLAUS U.; VIEIRA, RENATO J.R.; SILVA, DANILO M. da; JORGE, KELLY C.; JIMENEZ-VILLAR, ERNESTO; GIEHL, JULIA M.; MIRANDA, ADRIANA R. de; DIPOLD, JESSICA
Random lasers offer advantages such as low-cost fabrication and robustness in harsh environments and have applications in sensing, imaging, communications, and security. Our current research focuses on advanced materials, active control techniques, integration with other photonic structures, and exploration of Anderson localization and polydisperse effects. Coherent feedback in cavity-enhanced random lasers is discussed as means to achieve specific emission characteristics, and emission at 1300 nm is shown for the first time.
Mercury chloride toxicity attenuation of the Brine Shrimp Artemia Salina after treatment with Mercurius corrosivus as isotherapic
2022 - PINTO, ANDREIA A.G.; NAGAI, MIRIAN Y. de O.; COIMBRA, EDNAR N.; MOHAMMAD, SUHAM N.; SILVA, JEFFERSON S.; VON ANCKEN, ADALBERTO; PINTO, SANDRA A.G.; AGUIAR, MICHELLE S.; DUTRA-CORREA, MARISTELA; HORTELLANI, MARCOS A.; MIRANDA, ADRIANA; SARKIS, JORGE E. de S.; SUFFREDINI, IVANA B.; PERES, GIOVANI B.; BERNARDI, MARIA M.; CARTWRIGHT, STEVEN J.; BONAMIN, LEONI V.
Isotherapics prepared from toxic substances have been described as attenuation factors for heavy metal intoxication in aquatic animals. Herein, Artemia salina and mercury chloride were used as a model to identify treatment-related bioresilience. The aim was to describe the effects of Mercurius corrosivus (MC) in different potencies on Artemia salina cyst hatching and on mercury bioavailability. Artemia salina cysts were exposed to 5.0 µg/mL of mercury chloride during the hatching phase. MC 6cH, 30cH, and 200cH were prepared and poured into artificial seawater. Different controls were used (nonchallenged cysts and challenged cysts treated with water, succussed water, and Ethilicum 1cH). Four series of nine experiments were performed for 4 weeks to evaluate the percentage of cyst hatching considering all moon phases. Soluble total mercury (THg) levels and precipitated mercury content were also evaluated. Solvatochromic dyes were used to check for eventual physicochemical markers of MC biological activity. Two-way analysis of variance (ANOVA) with mixed models was used for evaluating the effect of different treatments and the simultaneous influence of the moon phases on the cysts hatching rate, at both observation times (24 and 48 hours). When necessary, outliers were removed, using the Tukey criterion. The level of significance α was set at 5%. Significant delay (p<0.0001) in cyst hatching was observed after treatment with MC 30cH, compared with the controls. An increase in THg concentration in seawater (p<0.0018) and of chlorine/oxygen ratio (p<0.0001) in suspended micro-aggregates was also seen, with possible relation with mercury bioavailability. Specific interaction of MC 30cH with the solvatochromic dye ET33 (p<0.0017) was found. The other observed potencies of Mercurius corrosivus 6 and 200 cH were not significant in relation to the observed groups. The results were postulated as being protective effects of MC 30cH on Artemia salina, by improving its bioresilience.
Bioresilience to mercury chloride of the brine shrimp Artemia salina after treatment with homeopathic Mercurius corrosivus
2021 - PINTO, ANDREIA A.G.; NAGAI, MIRIAN Y. de O.; COIMBRA, EDNAR N.; MOHAMMAD, SUHAM N.; SILVA, JEFFERSON S.; VON ANCKEN, ADALBERTO; PINTO, SANDRA A.G.; AGUIAR, MICHELLE S.; DUTRA-CORREA, MARISTELA; HORTELLANI, MARCOS A.; MIRANDA, ADRIANA; SARKIS, JORGE E. de S.; SUFFREDINI, IVANA B.; PERES, GIOVANI B.; BERNARDI, MARIA M.; CARTWRIGHT, STEVEN J.; BONAMIN, LEONI V.
Introduction: Finding solutions to mitigate the impact of pollution on living systems is a matter of great interest. Homeopathic preparations of toxic substances have been described in the literature as attenuation factors for intoxication. Herein, an experimental study using Artemia salina and mercury chloride was developed as a model to identify aspects related to bioresilience. Aims: The aim of the study was to describe the effects of homeopathic Mercurius corrosivus (MC) on Artemia salina cysts hatching and on mercury bioavailability. Methods: Artemia salina cysts were exposed to 5.0 µg/mL of mercury chloride during the hatching phase. MC potencies (6cH, 30cH, and 200cH) were prepared in sterile purified water and poured into artificial sea water. Different controls were used (non-challenged cysts and challenged cysts treated with water, succussed water, and Ethilicum 1cH). Four series of nine experiments were performed to evaluate the percentage of cyst hatching. Soluble total mercury (THg) levels and precipitated mercury content were also evaluated. Solvatochromic dyes were used to check for eventual physicochemical markers of MC biological activity. Results: Significant delay (p < 0.0001) in cyst hatching was observed only after treatment with MC 30cH, compared with controls. This result was associated with an increase of THg concentration in water (p = 0.0018) and of chlorine/oxygen ratio (p < 0.0001) in suspended micraggregates, suggesting changes in mercury bioavailability. A specific interaction of MC 30cH with the solvatochromic dye ET33 (p = 0.0017) was found. Conclusion: Changes in hatching rate and possible changes in Hg bioavailability are postulated as protective effects of MC 30cH on Artemia salina, by improving its natural bioresilience processes.
Dynamic random lasing in silica aerogel doped with rhodamine 6G
2018 - WETTER, NIKLAUS U.; MIRANDA, ADRIANA R. de; PECORARO, EDISON; RIBEIRO, SIDNEY J.L.; JIMENEZ-VILLAR, ERNESTO
Silica aerogel is a lightweight material, well known for its good mechanical and thermal characteristics, but its optical properties have received less attention, because it is weakly scattering. Here we present for the first time the lasing properties and their complex dynamics of silica aerogel doped with R6G. It is shown that the Q factors of the lasing modes determine the operation of the laser, being either resonant or ASE-lasing. For resonant lasing, the number of resonators is easily varied and the number of modes in a single resonator and their emission frequency can be dynamically adjusted, making this a truly versatile photonics material.
Study of the random laser emission of Ndsub(3+):YVOsub(4) powders as function of particle size and applied pressure
2014 - GIEHL, J.M.; MIRANDA, A.R.; REIJN, S.M.; WETTER, N.U.
Rhodamine-doped aerogel random laser
2014 - MIRANDA, ADRIANA R. de; PECORARO, EDISON; RIBEIRO, SIDNEY J.L.; GIEHL, JULIA M.; WETTER, NIKLAUS U.
Focusing light through a scattering medium under the influences of laser instability
2014 - REIJN, SAARA-MAARIT; GESKUS, DIMITRI; GIEHL, JULIA M.; MIRANDA, ADRIANA R. de; WETTER, NIKLAUS U.
Rhodamine-doped aerogel random laser
2014 - MIRANDA, ADRIANA R. de; PECORARO, EDISON; RIBEIRO, SIDNEY J.L.; GIEHL, JULIA M.; REIJN, SAARA-MAARIT; WETTER, NIKLAUS U.
Random laser generation in rhodamine-doped aerogel
2013 - MIRANDA, ADRIANA R. de; PECORARO, EDISON; RIBEIRO, SIDNEY L.; GIEHL, JULIA M.; REIJN, SAARA M.; WETTER, NIKLAUS U.