Methylmercury
Mostrando 13-24 de 95 artigos, teses e dissertações.
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13. Preparação e caracterização de um material de referência de peixe / Preparation and characterization of the fish reference material
The certified reference materials (CRMs) play an important role in obtaining measurement results traceable to the International System of Units, through an unbroken chain of comparisons. Thus, the demand for new certified reference materials (CRMs) increases every day in all areas of knowledge. The availability of reference materials, mainly in Brazil is sti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/03/2011
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14. Protective effects of organoselenium compounds against methylmercury-induced oxidative stress in mouse brain mitochondrial-enriched fractions
We evaluated the potential neuroprotective effect of 1-100 µM of four organoselenium compounds: diphenyl diselenide, 3’3-ditri-fluoromethyldiphenyl diselenide, p-methoxy-diphenyl diselenide, and p-chloro-diphenyl diselenide, against methylmercury-induced mitochondrial dysfunction and oxidative stress in mitochondrial-enriched fractions from adult Swiss mo
Brazilian Journal of Medical and Biological Research. Publicado em: 2011-11
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15. Bioconcentração e biomagnificação de metilmercúrio na baía de Guanabara, Rio de Janeiro
Methylmercury was determined in water and aquatic biota from Guanabara Bay. Trophic transfer of methylmercury was observed between trophic levels from prey (microplankton, mesoplankton and fish with different feeding habits) to top predator (pelagic demersal fish). Top predator fish presented the highest methylmercury concentrations (320.3 ± 150.7 mg kg-1 d
Química Nova. Publicado em: 2011
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16. Studies of micronuclei and other nuclear abnormalities in red blood cells of Colossoma macropomum exposed to methylmercury
The frequencies of micronuclei (MN) and morphological nuclear abnormalities (NA) in erythrocytes in the peripheral blood of tambaqui (Colossoma macropomum), treated with 2 mg.L-1 methylmercury (MeHg), were analyzed. Two groups (nine specimens in each) were exposed to MeHg for different periods (group A - 24 h; group B - 120 h). A third group served as negati
Genetics and Molecular Biology. Publicado em: 2011
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17. Avaliação das propriedades antigenotóxicas e antioxidantes do flavonóide quercetina e dos carotenóides bixina e norbixina contra os danos no material genético e distúrbios do estado redox causados pelo cloreto de mercúrio e metilmercúrio, in vitro e in vivo / Evaluation of antigenotoxic and antioxidant properties of the flavonoid quercetin and of the carotenoid bixin and norbixin against DNA-damage and alterations of redox status induced by mercury chloride and methylmercury, in vitro and in vivo
Mercury (Hg) is one of the most hazardous metals in the environment and the major process responsible for its toxicity is oxidative damage; its organic form methylmercury (MeHg) presents the highest toxicity. The main way of exposition to Hg is through inhalation by workers occupationally exposed in several industries and/or through consumption of fishes and
Publicado em: 2011
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18. Involvement of glutamate and reactive oxygen species in methylmercury neurotoxicity
This review addresses the mechanisms of methylmercury (MeHg)- induced neurotoxicity, specifically examining the role of oxidative stress in mediating neuronal damage. A number of critical findings point to a central role for astrocytes in mediating MeHg-induced neurotoxicity as evidenced by the following observations: a) MeHg preferentially accumulates in as
Publicado em: 2010
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19. Evaluation techniques coupled to mass spectrometry (ICP-MS) aimed at the fractionation and chemical speciation of mercury in blood and plasma / Avaliação de técnicas acopladas à espectrometria de massas com plasma (ICP-MS) visando o fracionamento e a especiação química de mercúrio em sangue e plasma
Mercury (Hg) is one of the most toxic environmental pollutants. It exists primarily in three forms: elemental mercury (Hg0), or metallic mercury, inorganic mercury (Hg-i), particularly mercuric chloride and organic mercury (Hg-o), mainly represented by methylmercury (MeHg) and ethylmercury (EtHg), and the organic forms of mercury are more toxic than the inor
Publicado em: 2010
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20. Efeitos da Cipura paludosa nos déficits comportamentais de ratos adultos expostos ao etanol e/ou metilmercúrio durante o desenvolvimento do SNC
A exposição fetal ao etanol (EtOH) e metilmercúrio (MeHg) ocorre em uma frequência elevada em todo o mundo. Até, então, não há uma terapia eficaz para tratar as consequências comportamentais produzidas por ambos os neurotoxicantes. Visto que plantas da medicina tradicional têm sido usadas pelo homem para aliviar uma variedade de doenças, estas tam
Publicado em: 2010
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21. AVALIAÇÃO DOS NÍVEIS BASAIS DE MERCÚRIO NA ÁREA DE INFLUÊNCIA DA UHE JIRAU RIO MADEIRA / AMAZÔNIA
O ciclo hidrobiogeoquímico do mercúrio contempla as fontes naturais e antrópicas do metal, bem como os processos bióticos e abióticos que ocorrem nos distintos reservatórios e que determinam o transporte e fixação das formas metálicas em algum receptor final. O processo de metilação do mercúrio tem merecido especial atenção em reservatórios na
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/12/2009
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22. Evaluation of toxic effects of methylmercury in the retina of fotoreceptores Hoplias malabaricus (BLOCK, 1794), trahira, through histopathological techniques / Avaliação dos efeitos tóxicos do metilmercúrio na retina de duas espécies de teleósteos: Hoplias malabaricus e Danio rerio, utilizando um conjunto de biomarcadores biológicos
Em exposições especificamente relacionadas ao metilmercúrio (MeHg), o principal órgão alvo é o Sistema Nervoso Central (SNC). Os efeitos morfológicos do metilmercúrio nos fotorreceptores da retina de Hoplias malabaricus, traíra, foram investigados através de técnicas histopatológicas. Os exemplares de traíra foram distribuídos em três grupos:
Publicado em: 2009
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23. Efeitos do etanol e/ou metilmercúrio no desenvolvimento do sistema nervoso central : alterações morfológicas e comportamentais em ratos adultos
Studies involving alcohol and its interactions with other neurotoxicants represent the focus of several researches due to the fact that the use of alcohol can sometimes lead to serious health problems. Fetal exposure to alcohol and mercury has a high incidence in some regions of Brazil, especially in mining areas habited by alcoholics pregnant women. This st
Publicado em: 2009
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24. O COMPLEXO METILMERCÚRIO-CISTEÍNA ALTERA O ACÚMULO DE MERCÚRIO EM DIFERENTES TECIDOS DE CAMUNDONGO / COMPLEX METHILMERCURY CYSTEINE ALTERS MERCURY ACCUMULATION IN DIFFERENT TISSUES OF MICE
Methylmercury (MeHg) is related to several deleterious effects on the vertebrate tissues, mainly on central nervous system, and part of these effects are through of interaction with sulfhydryl group found in cellular proteins. MeHg interacts with low and high molecular weight thiols in the blood and tissues and this fact, in some cases will allow a better ab
Publicado em: 2009