耐热细菌（地芽孢杆菌亚种和嗜热链球菌亚种）对 Cd、Cu、Ni、Mn 和 Zn 的抗性和生物积累。
Cd, Cu, Ni, Mn and Zn resistance and bioaccumulation by thermophilic bacteria, Geobacillus toebii subsp. decanicus and Geobacillus thermoleovorans subsp. stromboliensis.
机构信息
Biology Department, Faculty of Science, Dicle University, 21280, Diyarbakir, Turkey.
出版信息
World J Microbiol Biotechnol. 2012 Jan;28(1):155-63. doi: 10.1007/s11274-011-0804-5. Epub 2011 Jun 10.
Bioaccumulation and heavy metal resistance of Cd(2+), Cu(2+), Ni(2+), Zn(2+) and Mn(2+) ions by thermophilic Geobacillus toebii subsp. decanicus and Geobacillus thermoleovorans subsp. stromboliensis were investigated. The metal resistance from the most resistant to the most sensitive was found as Mn > Ni > Cu > Zn > Cd for both Geobacillus thermoleovorans subsp. stromboliensis and Geobacillus toebii subsp. decanicus. It was determined that the highest metal bioaccumulation was performed by Geobacillus toebii subsp. decanicus for Zn (36,496 μg/g dry weight cell), and the lowest metal bioaccumulation was performed by Geobacillus toebii subsp. decanicus for Ni (660.3 μg/g dry weight cell). Moreover, the dead cells were found to biosorbe more metal in their membranes compared to the live cells. In the presence of 7.32 mg/l Cd concentration, the levels of Cd absorbed in live and dead cell membranes were found as 17.44 and 46.2 mg/g membrane, respectively.
研究了嗜热芽孢杆菌亚种 decanicus 和 Geobacillus thermoleovorans subsp. stromboliensis 对 Cd(2+)、Cu(2+)、Ni(2+)、Zn(2+)和 Mn(2+)离子的生物积累和重金属抗性。发现两种 Geobacillus thermoleovorans subsp. stromboliensis 和 Geobacillus toebii subsp. decanicus 对 Mn 的抗性最强，对 Cd 的抗性最弱。结果表明，Geobacillus toebii subsp. decanicus 对 Zn 的生物积累最高（36496μg/g 干重细胞），对 Ni 的生物积累最低（660.3μg/g 干重细胞）。此外，与活细胞相比，死细胞在其膜中吸附更多的金属。在 7.32mg/l Cd 浓度下，发现活细胞和死细胞膜中吸收的 Cd 含量分别为 17.44 和 46.2mg/g 膜。
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