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- W2116594889 abstract "ABSTRACT 129 I is of major concern because of its mobility in the environment, excessive inventory, toxicity (it accumulates in the thyroid), and long half-life (∼16 million years). The aim of this study was to determine if bacteria from a 129 I-contaminated oxic aquifer at the F area of the U.S. Department of Energy's Savannah River Site, SC, could accumulate iodide at environmentally relevant concentrations (0.1 μM I − ). Iodide accumulation capability was found in 3 out of 136 aerobic bacterial strains isolated from the F area that were closely related to Streptomyces / Kitasatospora spp., Bacillus mycoides , and Ralstonia/Cupriavidus spp. Two previously described iodide-accumulating marine strains, a Flexibacter aggregans strain and an Arenibacter troitsensis strain, accumulated 2 to 50% total iodide (0.1 μM), whereas the F-area strains accumulated just 0.2 to 2.0%. Iodide accumulation by FA-30 was stimulated by the addition of H 2 O 2 , was not inhibited by chloride ions (27 mM), did not exhibit substrate saturation kinetics with regard to I − concentration (up to 10 μM I − ), and increased at pH values of <6. Overall, the data indicate that I − accumulation likely results from electrophilic substitution of cellular organic molecules. This study demonstrates that readily culturable, aerobic bacteria of the F-area aquifer do not accumulate significant amounts of iodide; however, this mechanism may contribute to the long-term fate and transport of 129 I and to the biogeochemical cycling of iodine over geologic time." @default.
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- W2116594889 date "2011-03-15" @default.
- W2116594889 modified "2023-10-16" @default.
- W2116594889 title "Iodide Accumulation by Aerobic Bacteria Isolated from Subsurface Sediments of a <sup>129</sup> I-Contaminated Aquifer at the Savannah River Site, South Carolina" @default.
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- W2116594889 doi "https://doi.org/10.1128/aem.02164-10" @default.
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