| 温度和电子传递体AQDS对铁还原细菌Shewanella putrefaciens CN32矿化产物的影响 |
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| 引用本文： | 李陛,吴文芳,李金华,潘永信.温度和电子传递体AQDS对铁还原细菌Shewanella putrefaciens CN32矿化产物的影响[J].地球物理学报,2011,54(10):2631-2638. |
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| 作者姓名： | 李陛 吴文芳 李金华 潘永信 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所地球深部研究重点实验室,北京 100029;
2. 中国科学院研究生院,北京 100049;
3. 中法生物矿化与纳米结构联合实验室, 北京 100029 |
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| 基金项目： | 国家自然科学基金委创新群体项目，中国科学院创新团队项目，国际合作伙伴计划项目 |
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| 摘 要： | 微生物矿化产生的超顺磁性(SP)磁铁矿是沉积物和土壤中磁性矿物的重要来源.本文比较了三个不同温度下(20℃,30℃,37℃)纯培养铁还原细菌Shewanella putre aciens CN32还原水合氧化铁形成SP磁铁矿的矿化特征.在实验体系中加入细菌CN32后,体系的氧化还原电位Eh迅速下降,酸碱度pH和亚铁离子...
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| 关 键 词： | 铁还原细菌 磁铁矿 生物矿化 培养温度 AQDS |
| 收稿时间： | 2010-11-26 |
Effects of temperature on biomineralization of iron reducing bacteria Shewanella putre f aciens CN32 |
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| LI Bi,WU Wen-Fang,LI Jin-Hua,PAN Yong-Xin.Effects of temperature on biomineralization of iron reducing bacteria Shewanella putre f aciens CN32[J].Chinese Journal of Geophysics,2011,54(10):2631-2638. |
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| Authors: | LI Bi WU Wen-Fang LI Jin-Hua PAN Yong-Xin |
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| Institution: | 1. Key Laboratory of the Earth's Deep Interior, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
3. Franco-Chinese Biomineralization and Nano-structures Laboratory, Beijing 100029, China |
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| Abstract: | The superparamagnetic (SP) magnetite produced by microorganism is an important source of magnetic minerals in sediments and soils. To investigate the behavior of the biomineralization, we compared the reduction of hydrous iron oxide and the formation of magnetite by iron reducing bacteria Shewanella putrefaciens CN32 at different temperatures (20℃, 30℃,37℃). It was observed that after the addition of bacteria to the system, the Eh began to decrease quickly while the pH and the concentration of ferrous increased, and the formation of magnetite started. Transmission electron microscopy observation and magnetic hysteresis loop of room temperature show that superparamagnetic magnetite was produced. Comparing the variations of susceptibility and isothermal remanent magnetization in different conditions suggests that temperature is the most important factor influencing the biomineralization, the increase of the temperature accelerated the mineralization. The fact that coercivity increased with the temperature and low temperature magnetic measurement suggests that the average blocking temperature (Tb) of the magnetite increased from 95K at 20℃ to 160K at 37℃, both indicating that the size of the particles increased. Also the addition of AQDS (2,6-anthraquinone disulphonate) as the electron shuttle accelerated the biomineralization by CN32. These results help us to understand the biomineralization capability of iron reducing bacteria and their contribution to the environmental magnetism. |
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| Keywords: | Iron reducing bacteria Magnetite Biominneralization Temperature AQDS |
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