Redox transformations of arsenic oxyanions in periphyton communities

Article Abstract:

Microbial As(III) oxidation and dissimilatory As(V) reduction by live samples of freshwater periphyton collected from San Francisquito Creek, a suburban freshwater drainage in Palo Alto, California, characterized by low concentrations of ambient arsenic is discussed. The presence of a bacterial population within the periphyton communities is capable of two key arsenic redox transformations that were studied in As-contaminated environments suggesting that these processes are widely distributed in nature.

Science & research, All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Arsenic & Compounds, Methods, Arsenic compounds, Microorganisms, Chemical properties

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Bacterial dissimilatory reduction of arsenic(V) to arsenic(III) in anoxic sediments

Article Abstract:

The reduction of arsenic(V) to arsenic(III) in anoxic sediments using the electron donor lactate as the catalyst. High-performance liquid chromatography is used in the analysis. Results suggest that no quantitatively significant reduction of arsenic occurs beyond the arsenic(III) series. The data also indicate that the reduction of arsenic(V) to arsenic(III) is a bacterial respiratory process.

Environmental aspects, Arsenic, Slurry, Slurries

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Oxidation of methyl halides by the facultative methylotroph strain IMB-1

Article Abstract:

Research conducted on strain IMB-1 physiology and substrate affinities is presented. Results indicate the presence of different substrate affinities for methyl bromide (MeBr), methyl chloride (MeCl) and methyl iodide (MeI), and the capability of strain IMB-1 methyl halide oxidation system to degrade low levels of MeBr, MeCl and MeI.

United States, Physiological aspects, Biotechnology, Methanol, Halides

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