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Cesium accumulation by bacterium Thermus sp. TibetanG7:hints for biomineralization of cesium-bearing geyserite in hot springs in Tibet,china

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chinese Science Bulletin 2007年第19期52卷 2680-2686页

作者： wang hailei1,2,3, zheng mianping1,2,3 & huang xiaoxing4 1 institute of mineral resources, chinese academy of geological sciences (CAGS), beijing 100037, china 2 R&D Center for Saline Lake and Epithermal Deposits, CAGS, beijing 100037, china 3 Open Laboratory of Saline Lake Resourses and Environment, CAGS, beijing 100037, china 4 Laboratory of Microbial resources, institute of Microbiology, chinese academy of sciences, beijing 100081, china institute of mineral resources Chinese Academy of Geological Sciences (CAGS) Beijing China R&D Center for Saline Lake and Epithermal Deposits CAGS Beijing China Open Laboratory of Saline Lake Resourses and Environment CAGS Beijing China Laboratory of Microbial resources Institute of Microbiology Chinese Academy of Sciences Beijing China

The bacterium Thermus sp. TibetanG7, isolated from hot springs in Tibet, china, was examined for the ability to accumulate cesium from solutions. Environmental conditions were simulated and the effects of pH, K+, Na+ and K+-regimes were then studied to determine the possible role of the bacterium in the formation of cesium-bearing geyserite around these hot springs. In despite of the inhibition of K+ and Na+, the bacterium Thermus sp. TibetanG7 revealed noticeable accumulation of cesium from solutions, with maximum accumulations of 53.49 and 40.41 μmol Cesium/g cell dry weight in Na+ and K+ inhibition experiments, respectively. The accumulation of cesium by this microorganism is rapid, with 40%―50% accumulated within the first 5 min. K+-deficient cells showed a much higher capacity of cesium accu- mulation compared with K+-sufficient cells. It is evident that the bacteria within the genus thermus play a significant role in the cesium assembly. The formation of cesium-bearing geyserite is also considered.

关键词：铯元素沉积物硅华生物矿化

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