Methylmercury
Mostrando 1-12 de 95 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. Mercury Bioaccumulation in Eggs of Hens Experimentally Intoxicated with Methylmercury Chloride and Detoxified with a Humic-Aluminosilicate Preparation
ABSTRACT The aim of the study was to evaluate the effectiveness of preventive-detox preparation (P-dP) based on humic and aluminosilicate substances in the diet of laying hens (3% daily dose) previously intoxicated with methylmercury chloride (CH3ClHg, 5 mg Hg/kg feed mixture) for six weeks. Mercury content in the whole eggs of the group intoxicated with CH3
Rev. Bras. Cienc. Avic.. Publicado em: 2015-12
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3. Methylmercury inhibits prolactin release in a cell line of pituitary origin
Heavy metals, such as methylmercury, are key environmental pollutants that easily reach human beings by bioaccumulation through the food chain. Several reports have demonstrated that endocrine organs, and especially the pituitary gland, are potential targets for mercury accumulation; however, the effects on the regulation of hormonal release are unclear. It
Braz J Med Biol Res. Publicado em: 23/06/2015
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4. Mercury Exposure in a Riverside Amazon Population, Brazil: A Study of the Ototoxicity of Methylmercury
Introduction Mercury poisoning causes hearing loss in humans and animals. Acute and long-term exposures produce irreversible peripheral and central auditory system damage, and mercury in its various forms of presentation in the environment is ototoxic.
Objective We investigated the otoacoustic emissions
Int. Arch. Otorhinolaryngol.. Publicado em: 2015-06
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5. METODOLOGIAS DE COLETA, PRESERVAÇÃO E ARMAZENAMENTO DE AMOSTRAS DE ÁGUA PARA ANÁLISE DE MERCÚRIO - UMA REVISÃO
Knowing the mercury levels of an environment allows a diverse array of biogeochemical studies into the mercury cycle on a local or global scale. Among matrices commonly evaluated, water remains a challenge for research because its mercury levels can be very low, requiring development of complex analytical protocols. Currently, sample preservation methods, pr
Quím. Nova. Publicado em: 2015-03
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6. Effects of methylmercury on electric organ discharges in the weak electric fish Gymnotus sylvius
Methylmercury (MeHg) is present in the environment because of natural and anthropogenic causes. MeHg can reach the central nervous system (CNS) and cause neurological damage in humans and animals. Electric organ discharges (EODs) in the weak electric fish Gymnotus sylvius are produced by the electric organ and modulated by the CNS. These discharges are used
Psychol. Neurosci.. Publicado em: 2013-06
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7. EFEITOS DE COMPOSTOS ORGÂNICOS DE SELÊNIO FRENTE À TOXICIDADE INDUZIDA POR GLUTAMATO E METILMERCÚRIO / EFFECTS OF ORGANOSELENIUM COMPOUNDS AGAINST THE TOXICITY INDUCED BY GLUTAMATE OR METHYLMERCURY
Os compostos orgânicos de selênio têm sido propostos como potenciais agentes farmacológicos para o tratamento de patologias associadas ao estresse oxidativo. Em particular, o disseleneto de difenila e o ebselen têm sido demonstrados como potentes agentes antioxidantes em uma variedade de modelos experimentais. Dessa forma, os objetivos do presente estud
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/03/2012
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8. EFEITO in vitro DE Paullinia cupana NO METABOLISMO OXIDATIVO DE ESPERMATOZÓIDES HUMANOS EXPOSTOS AO CLORETO DE METILMERCÚRIO / EFFECT OF Paullinia cupana in vitro oxidative metabolism HUMAN SPERM EXPOSED TO CHLORIDE METHYLMERCURY
Investigations suggests that methylmercury (MeHg) toxicitiy is related to oxidative stress promotion caused by lipid peroxidation of cell membranes as well as genotoxicity. The methylmercury (MeHg) exposition causes production of adverse effects as deterioration of semen quality, testicular degeneration, and male reproductive failure. Since human sperm is a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/02/2012
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9. Mecanismos de captação e toxicidade do metilmercúrio: Envolvimento do sistema glutamatérgico e do cálcio em fatias e mitocôndrias de ratos. / Mechanism of uptake and toxicity of methylmercury: Involvement of glutamatergic system and calcium em fatias e mitocôndrias de ratos.
O metilmercúrio (MeHg) é um contaminante ambiental altamente tóxico que pode ser bioacumulado em diferentes tecidos e consequentemente induzir disfunções celulares em diversos órgãos, especialmente no sistema nervoso central (SNC). Os mecanismos pelos quais o mercúrio (Hg) entra nos tecidos, se acumula e causa toxicidade em células e organelas ainda
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/01/2012
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10. Organic and total mercury determination in sediments by cold vapor atomic absorption spectrometry: methodology validation and uncertainty measurements
The purpose of the present study was to validate a method for organic Hg determination in sediment. The procedure for organic Hg was adapted from literature, where the organomercurial compounds were extracted with dichloromethane in acid medium and subsequent destruction of organic compounds by bromine chloride. Total Hg was performed according to 3051A USEP
Química Nova. Publicado em: 2012
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11. Isolamento de bactérias tolerantes e fatores que afetam a transformação de metilmercúrio por Pseudomonas putida V1 in vitro / Isolation of tolerant bacteria and factors that affect in vitro TRANSFORMATION OF METHYLMERCURY by Pseudomonas putida V1
As atividades industrial e urbana podem levar à contaminação do ambiente com mercúrio e este causa inúmeros problemas relacionados à saúde do homem e de animais. Os ambientes contaminados com mercúrio e suas formas selecionam micro-organismos tolerantes a esse metal e desta forma podem ser utilizados como estratégia de remediação destes ambientes.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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12. Análise de células bipolares PKCa-IR e células ganglionares da retina do peixe tropical Hoplias malabaricus intoxicado com baixas doses agudas de metilmercúrio / Not informed by the author
O presente trabalho tem por objetivo analisar o efeito do metilmercúrio na retina de peixe tropical Hoplias malabaricus (Traíra) através de baixas doses agudas. As intoxicações foram realizadas, por meio de injeção intraperitoneal, nas doses de 0,01, 0,05, 0,1 e 1,0 g/g, com um período de quinze dias de depuração do MeHg. Após o término do perío
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/08/2011