In this study, concentrations of mercury (Hg) and 16 other elements as well as methylmercury speciation were quantified in muscle and liver of two commercial fish species. It was also our intention to evaluate potential risks to human health associated with seafood consumption. The fish species, Mullet and Kutum (Caspian White fish) fishes, were obtained from Tonekabon at the Iranian waters of ...

Unlike large dams which favor methylation of Hg in flooded soils over long periods, run-of-river are designed to flood a limited area and therefore not expected significantly affect mercury (Hg) cycling or carbon processing. We studied the cycles within food webs from several sectors along Saint-Maurice River, Quebec, Canada, that differ how they influenced by two other watershed disturbances. ...

Selenium, a nutrient, and methylmercury, a developmental neurotoxicant, are both found in fish. There are reports that selenium sometimes ameliorates methylmercury's neurotoxicity, but little is known about the durability of this protection after low-level gestational exposure. Developmental methylmercury exposure disrupts behavioral plasticity, and these effects extend well into adulthood and ...

Physiologically based pharmacokinetic (PBPK) models are excellent tools to aid in the extrapolation of animal data to humans. When the fate of the chemical is the same among species being compared, animal data can appropriately be considered as a model for human exposure. For methylmercury exposure, sufficient data exist to allow comparison of numerous mammalian species to humans. PBPK model va...

0001 When technological advances in the 1930s provided the means to synthesize chemicals from petroleum and natural gas, the petrochemical industry ramped up production of diverse species of novel compounds without testing their safety. By 1940, a billion pounds of synthetic petrochemicals were produced each year. Of the more than 38 million chemicals reported in the scientifi c literature, 80,...

The production of the neurotoxic methylmercury in the environment is partly controlled by the bioavailability of inorganic divalent mercury (Hg(II)) to anaerobic bacteria that methylate Hg(II). In sediment porewater, Hg(II) associates with sulfides and natural organic matter to form chemical species that include organic-coated mercury sulfide nanoparticles as reaction intermediates of heterogen...

Mercury content, as methylmercury, in aquatic biota varies greatly among species from the same location. Many parameters may affect its accumulation and concentration in fish tissues. The study assessed total mercury (T-Hg) and methylmercury (MeHg) in the muscle, liver and gonad of Micropogonias furnieri carnivorous fish, Bagre spp. omnivorous fish and Mugil liza iliophagous fish from a pollute...

Rodent experiments have documented neuropathological lesions specifically located in the brainstem when toxic methylmercury (MeHg) exposure occurs at a particular time during brain development. The possible sensitivity of the brainstem to MeHg was explored in the prospective study of a Faroese birth cohort (N = 1,022), most recently examined at age 14 years. In 878 of eligible children (87%), l...