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Mobilization of selenite by Ralstonia metallidurans CH34. Appl Environ Microbiol 67, 769-773
| Roux M., Sarret, G., Pignot-Paintrand, I. , Fontecave, M. , Coves, J. (2001).
| Ralstonia metallidurans CH34 (formerly Alcaligenes eutrophus CH34) was found in the metal-rich sediments of a zinc factory and has been demonstrated to prevail in industrial anthropogenic biotopes such as metallurgic wastes. It harbors plasmid-borne multiple resistance to heavy metals and oxyanions. The isolate showed resistance to selenite stress, resisting up to 6 mM selenite when cultured in solid minimal mineral medium. It reduced selenite to elemental red selenium as shown by extended X-ray obsorption fine structure analysis. Growth kinetics analysis suggested an adaptation of the cells to the selenite stress during the lag, phase period. Depending on the culture conditions, the medium could be completely depleted of selenite. Selenium accumulated essentially in the cytoplasm as judged from electron microscopy and energy-dispersive X-ray analysis. Elemental selenium, highly insoluble, represented a nontoxic storage form for the bacterium. The ability of R. metallidurans CH34 to reduce large amounts of selenite and to accumulate it as selenium granules may be of interest for bioremediation processes targeting selenite-polluted sites.
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