Methyl Mercury
Mostrando 1-12 de 41 artigos, teses e dissertações.
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1. Mercury and methylmercury in carapace of the marine turtle Caretta caretta, in northeastern Brazil and its potential for environmental monitoring
Abstract: The present work tests the use of carapace fragments of the marine turtle Caretta caretta as a tool for environmental biomonitoring of mercury (Hg) and to evaluate the influence of biological and ecological factors in Hg concentrations. Samples of carapace fragments were obtained during the nesting season of 2012 and 2016 and were analyzed for thei
An. Acad. Bras. Ciênc.. Publicado em: 10/07/2019
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2. Feasibility of Using AAS for the Characterization of a Tuna Fish Candidate Reference Material for Total Hg and Methyl-Hg Measurement
This work describes the evaluation of several parameters for preparing a tuna fish candidate reference material (RM) in order to measure its total Hg and methyl-Hg mass fractions by cold vapor atomic absorption spectrometry (CV-AAS) and solid sampling graphite furnace atomic absorption spectrometry (SS-GF AAS). Best results were acquired after extraction wit
J. Braz. Chem. Soc.. Publicado em: 2016-04
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3. EFEITO TOXICOGENÉTICO DO POLIMORFISMO ALA16VAL DO GENE MnSOD EM LEUCÓCITOS EXPOSTOS IN VITRO AO METIL MERCÚRIO / TOXIGENETIC EFFECT OF ALA16VAL MnSOD GENE POLYMORPHISM ON LEUCOCYTES IN VITRO EXPOSED TO METHYL MERCURY
The environmental contamination by methyl mercury (MeHg) is a great health public problem in some world regions like Amazonia. The MeHg toxic effects seem to be influenced by environmental and genetic factors. However, there are few studies evaluating the genetic influence on MeHg toxicity in humans. Therefore, the aim of this present study was to evaluate t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/03/2012
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4. Methyl and total mercury found in two man-made Amazonian Reservoirs
Metilmercúrio (MeHg) e mercúrio total (Hg) foram determinados em amostras de água e peixe coletadas em dois reservatórios da Amazônia Brasileira, que apresentam diferentes características limnológicas e ecológicas. As amostras de água de Tucuruí, reservatório mesotrófico com águas claras, apresentaram a concentração de Hg (12,7 ± 8,4 ng L-1)
Journal of the Brazilian Chemical Society. Publicado em: 2009
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5. Síntese e avaliação da atividade fitotóxica de derivados da α-Santonina
Mixtures of α-Santonin and various solvents were irradiated by either high or low pressure mercury lamps. The photochemical reactions afforded lumisantonin (11) (76% in acetonitrile), (3S,3aS,9bS)-3,6,6-trimethyl-3,3a,4,5-tetrahydronafto[1,2-b]furan-2,7(6H,9bH)dione (12) (100% in acetonitrile), 10α-acetoxy-3-oxo-1,7αH,6,11βH-guaia-4-en-6,12-olide (8) (26
Química Nova. Publicado em: 2009
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6. Total and methyl mercury in different species of molluscs from two estuaries in Rio de Janeiro State
Mercúrio total e metilmercúrio foram avaliados em três espécies de moluscos (Perna perna - mexilhão, Crassostrea rhizophorae - ostra, Anomalocardia brasiliana - vôngole) provenientes de dois estuários no estado do Rio de Janeiro, impactados por matéria orgânica e metais pesados. O mexilhão foi a espécie que apresentou melhor capacidade para acumul
Journal of the Brazilian Chemical Society. Publicado em: 2006-12
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7. Effects of mercury intoxication on the response of horizontal cells of the retina of thraira fish (Hoplias malabaricus)
Methyl mercury (MeHg) is highly neurotoxic, affecting visual function in addition to other central nervous system functions. The effect of mercury intoxication on the amplitude of horizontal cell responses to light was studied in the retina of the fish Hoplias malabaricus. Intracellular responses were recorded from horizontal cells of fish previously intoxic
Brazilian Journal of Medical and Biological Research. Publicado em: 2006-07
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8. Experimental development and mathematical simulation of the photochemically initiated methyl methacrylate pre-polymerization process. / Desenvolvimento experimental e simulação matemática do processo de pré-polimerização fotoiniciada do metacrilato de metila (MMA).
The aim of this work is the experimental optimization, the mathematical modeling and the simulation of the photochemically initiated pre-polymerization process of methyl methacrylate (MMA). According to the industrial interests a pre-polymer of narrow molecular weight distribution (MWD) and defined weight concentration was pointed as an optimum since it impr
Publicado em: 2006
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9. HPMA and HEMA copolymer bead interactions with eukaryotic cells
Two different hydrophilic acrylate beads were prepared via aqueous suspension polymerization. Beads produced of a hydroxypropyl methacrylate (HPMA) and ethyleneglycol methacrylate (EDMA) copolymer were obtained using a polyvinyl alcohol suspending medium. Copolymers of 2hydroxyethyl methacrylate (HEMA), methyl methacrylate (MMA) and ethyleneglycol methacryla
Materials Research. Publicado em: 2004-09
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10. Cytogenetic damage related to low levels of methyl mercury contamination in the Brazilian Amazon
The mercury rejected in the water system, from mining operations and lixiviation of soils after deforestation, is considered to be the main contributors to the contamination of the ecosystem in the Amazon Basin. The objectives of the present study were to examine cytogenetic functions in peripheral lymphocytes within a population living on the banks of the T
Anais da Academia Brasileira de Ciências. Publicado em: 2000-12
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11. Characteristics and Relationships of Mercury-Resistant Mutants and Methionine Auxotrophs of Yeast1
Approximately one-half of the mutants of Saccharomyces cerevisiae that are selected as resistant to methyl mercury are also found to require methionine. Eighty-four percent of these met mutations occur at the met15 locus, and the remaining 16% occur at the met2 locus. Surprisingly, the methionine-requiring mutants are recovered at a much higher frequency on
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12. Formation of Methyl Mercury by Bacteria
Twenty-three Hg2+ resistant cultures were isolated from sediment of the Savannah River in Georgia; of these, 14 were gram-negative short rods belonging to the genera Escherichia and Enterobacter, six were gram-positive cocci (three Staphylococcus sp. and three Streptococcus sp.) and three were Bacillus sp. All the Escherichia, Enterobacter, and the Bacillus