Methylmercury oxidative degradation potentials in contaminated and pristine sediments of the Carson River, Nevada

Article Abstract:

The oxidation of monomethylmercury produced (super 14)CO2 which is present in the sediment samples taken from mercury-contaminated sites of the Carson River, Nevada is shown. The (super 14)CO2 is formed in the regions of active denitrification and sulfate reduction of the river, and in the zones of methanogenesis. In a sample taken from an uncontaminated zone, about 98% of the product from (C{super 14})MeHg is (super 14)CO2, but sulfate reduction and methanogenic activity levels are low.

Observations, Sediments (Geology), Carson River Watershed, Nevada

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Mercury adaptation among bacteria from a deep-sea hydrothermal vent

Article Abstract:

The high levels of mercury resistance merA to Hg (II) found in bacteria isolated form the interface between hydrothermal fluids and oxygenated seawater is studied. The distribution of mercury resistance among the deep-sea strains studied clearly showed that mesophilic and moderately thermophilic strains from the vent and its associated plume were more resistant to Hg(II) than psychrophilic strains collected at the control side.

Phylogeny, Heavy metals, Structure, Chemical properties, Hydrothermal fluids

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Coupling of bacterial endosymbiont and host mitochondrial genomes in the hydrothermal vent clam Calyptogena magnifica

Article Abstract:

Results point out that there is a genetic coupling emnating from maternal cotransmission of host mitochondrial and bacterial endosymbiont genomes, suggesting that the symbiont may have lost its ability to exist freely in marine environments. furthermore, genetic analysis shows no recombination of the two cytoplasmic genes.

United States, Genetic aspects, Adaptation (Biology), Evolutionary adaptation, Genetic recombination, Endosymbiosis, Cytoplasmic inheritance

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