海洋细菌Bacillus sp. Cs-700耐受及移除铯能力研究

为了筛选可以耐受高浓度铯离子(Cs⁺)的海洋细菌并探究细菌耐受Cs⁺的机制,本研究从广西近海沉积物样品中筛选出一株能够耐受700 mmol/dm³ Cs⁺的海洋细菌,是目前已报道的可耐受最高浓度Cs⁺的细菌。通过形态学分析、16S rRNA序列分析及生理生化特性的测定,确定该菌属于芽孢杆菌属(Bacillus),故将该菌株命名为Bacillus sp.Cs-700。在添加有700 mmol/dm³氯化铯的培养基中,菌体对铯的移除率最高可达52.06%。研究结果表明Bacillus sp.Cs-700不但具有耐受高浓度Cs⁺的特性,还具有较好的铯移除能力,具有修复放射性铯污染环境的潜力。本研究可为探索海洋放射性铯的生态修复提供参考。

Cesium tolerance and removal ability of marine bacterium Bacillus sp. Cs-700

To screen marine bacteria which can tolerate a high concentration of cerium ion (Cs⁺) and its mechanism, we obtained a bacterium from the sediments of offshore area of Guangxi. The strain could survive in an environment of 700 mmol/dm³+ and is the bacterium that has been reported to tolerate the highest concentration of Cs⁺ . This bacterium was named Bacillus sp. Cs-700 after it had been identified by morphology, 16S rRNA sequence, and physiological and biochemical characteristics. In the medium supplemented with 700 mmol/dm³Bacillus sp. Cs-700 not only was able to tolerate high concentration of Cs⁺ but also had a good Cs⁺ removal ability, and had the potential to restore the environment contaminated by radioactive cesium. This study can be taken as reference for ecological restorations of environment contaminated by radioactive cesium.