| Cesium accumulation by bacterium Thermus sp. TibetanG7： hints for biomineralization of cesiumbearing geyserite in hot sprinss in Tibet, China |
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| 作者姓名： | WANG HaiLei ZHENG MianPing HUANG XiaoXing |
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| 作者单位： | [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 |
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| 基金项目： | Supported by the China Geological Survey （contract No. 200313000065） and the State Plan for Development of Basic Research in Key Areas （contract No. 2002CG412610）
We are gruteful to Dr.Huang Li and Dong .Z.Y.for their kind help in isolution and culture of the bacteria,Also We thanks Dr.Ge Jun for the help in field sampling .Dr .S.A.Shephend kindlx improved the English. |
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| 摘 要： | 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 pmol 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 accumulation 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.
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| 关 键 词： | 铯元素 沉积物 硅华 生物矿化 |
| 收稿时间： | 21 May 2007 |
| 修稿时间： | 2007-05-21 |
Cesium accumulation by bacterium Thermus sp. TibetanG7: hints for biomineralization of cesium-bearing geyserite in hot springs in Tibet,China |
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| WANG HaiLei ZHENG MianPing HUANG XiaoXing.Cesium accumulation by bacterium Thermus sp. TibetanG7: hints for biomineralization of cesium-bearing geyserite in hot springs in Tibet,China[J].Chinese Science Bulletin,2007,52(19):2680-2686. |
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| Authors: | Wang HaiLei Zheng MianPing Huang XiaoXing |
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| Institution: | (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 |
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| Abstract: | 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 accumulation 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.
Supported by the China Geological Survey (contract No. 200313000065) and the State Plan for Development of Basic Research
in Key Areas (contract No. 2002CG412610) |
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| Keywords: | cesium cesium-bearing geyserite Thermus sp TibetanG7 accumulation ore formation model |
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