Reduction of Fe(III), Cr(VI), U(VI), Tc(VII) by Deinococcus radiodurans R1

Article Abstract:

Reduction of Fe(III), Cr(VI), U(VI), Tc(VII) by Deinococcus radiodurans R1 is discussed. D. radiodurans is exceptionally radiation-resistant, but has been described as strictly aerobic in respiration. Evidence that D radiodurans can reduce Fe(III) some organic compounds has been found. With humic acids or synthetic electron shuttle agents D. radiodurance can reduce U and Tc. Thus it has potential applications for remediation of metal- and radionuclide-contaminated sites where ionizing radiation or other DNA-damaging agents may cut back on activity of more sensitive organisms. It is an attractive candidate for genetic manipulations for enhancing organopollutant degradation.

Physiological aspects, Bacteria, Bioremediation, Uranium, Radioactivity, Chromium, Chromium (Metal), Biogeochemical cycles, Electron mobility

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Effect of electron donor and solution chemistry on products of dissimilatory reduction of technetium by Shewanella putrefaciens

Article Abstract:

Research has been conducted on the microbial dissimilatory reduction processes. The effect of electron donor and bicarbonate ion on the pertechnetate ion enzymatic reduction has been investigated.

Statistical Data Included, Analysis, Enzymes, Technetium, Electrons, Bicarbonates

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Dissimilatory reduction of Fe(III) and other electron acceptors by a Thermus isolate

Article Abstract:

An anaerobic Thermus strain that can perform the dissimilatory reduction of iron and grows by using oxygen and nitrate as terminal electron acceptors has been isolated. The bacterium, designated SA-01, was obtained from groundwater sampled at a depth of 3.2 km at a South African gold mine. Its 16S rRNA gene sequence is more than 98% similar with Thermus strain NMX2 A.1 which was isolated from a thermal spring in New Mexico. Strain SA-01 can reduce soluble Fe(III) complexed with citrate or nitriloacetic acid and small quantities of hydrous ferric oxide.

Bacteria, Thermophilic, Bacterial genetics, Thermophiles

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