Direct and Fe(II)-mediated reduction of technetium by Fe(III)-reducing bacteria

Article Abstract:

Iron reducing bacteria Geobacter sulfurreducens mediate enzymatic reduction of technetium(VII) through hydrogen oxidation as well as indirectly by iron-mediated mechanism. Implications of this phenomenon in the immobilization of technetium in sediments are discussed.

France, Physiological aspects, Microbial metabolism, Bacteria, Microbial enzymes

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Interactions between the Fe(III)-reducing bacterium Geobacter sulfurreducens and arsenate, and capture of the metalloid by biogenic Fe(II)

Article Abstract:

The potential of Geobacter sulfurreducens to mobilize arsenic through direct enzymatic reduction and indirect mechanisms linked to Fe(III) reduction is explored. The results show that Geobacter sulfurreducens, a model Fe(III)-reducing bacterium, did not reduce As(V) enzymatically, though the reduction of Fe(III) led to the formation of Fe(II)-bearing phases that are able to capture arsenic species and could act as sinks for arsenic in sediments.

Science & research, Iron compounds, Enzyme activation, Chemical properties, Iron bacteria, Metal-reducing bacteria

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Reduction of technetium by Desulfovibrio desulfuricans: biocatalyst characterization and use in a flowthrough bioreactor

Article Abstract:

Hydrogen and formate are ideal electron donors for the biotransformation of technetium, a Uranium 235-derived radioactive isotope believed to cause nuclear contamination. Results gathered from a study conducted on the resting cells of Desulfovibrio desulfuricans revealed that technetium reduction was minimal when lactate and ethanol were used as substrates. However, when hydrogen and formate substrates were utilized, increased reduction was observed along the periphery of the cells. The results point to the possible use of sulfate-reducing bacteria for wastewater cleanup properties.

Usage, Environmental aspects, Enzymes, Water, Water treatment, Oxidation-reduction reaction, Oxidation-reduction reactions, Bioreactors, Radioactive substances, Radioactive elements

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