The effects of surfactant Tween-80 on the growth, sulfur oxidation, and expression of selected typical sulfur metabolism relevant genes of Acidithiobacillus ferrooxidans ATCC 23270 were investigated. The results showe...The effects of surfactant Tween-80 on the growth, sulfur oxidation, and expression of selected typical sulfur metabolism relevant genes of Acidithiobacillus ferrooxidans ATCC 23270 were investigated. The results showed that in the presence of 10-2 g/L Tween-80, the growth of A. ferrooxidans and its metabolism on the insoluble substrate S0 and CuFeS2 were promoted. After 24 d of bioleaching, the copper extraction yield of chalcopyrite at 10-2 g/L Tween-80 increased by 16% compared with the bioleaching experiment without Tween-80. FT-IR spectra analysis revealed that the result was probably caused by the extracellular polymeric substances whose composition could be changed by the surfactant addition. RT-qPCR was used to analyze the differential expressions of 17 selected sulfur metabolism relevant genes in response to the addition of Tween-80. Down-regulation of the extracellular protein genes indicated the influence of Tween-80 on bacteria-sulfur adsorption. Variation of the expression level of the enzymes provided a supplement to sulfur metabolism investigation.展开更多
基于室温下考马斯亮蓝可发射强而稳定的荧光,Mn2+能灵敏催化过氧化氢氧化考马斯亮蓝使体系的荧光增强,据此建立了Tween-80增敏过氧化氢氧化考马斯亮蓝催化荧光法测定痕量锰的新方法.其线性范围为0.01-2.00(ng/mL),工作曲线的回归方程为...基于室温下考马斯亮蓝可发射强而稳定的荧光,Mn2+能灵敏催化过氧化氢氧化考马斯亮蓝使体系的荧光增强,据此建立了Tween-80增敏过氧化氢氧化考马斯亮蓝催化荧光法测定痕量锰的新方法.其线性范围为0.01-2.00(ng/mL),工作曲线的回归方程为△F=2.306+100.6 C Mn2+(ng/mL),相关系数r=0.9989,检出限为7.5×10-12g/mL.本法成功用于自来水和江水中痕量锰(II)的测定.同时探讨了催化过氧化氢氧化考马斯亮蓝离子缔合物荧光反应机理.展开更多
基金Projects (50974140, 51274257) supported by the National Natural Science Foundation of ChinaProject (20090162110054) supported by the PhD Programs Foundation of Ministry of Education of China
文摘The effects of surfactant Tween-80 on the growth, sulfur oxidation, and expression of selected typical sulfur metabolism relevant genes of Acidithiobacillus ferrooxidans ATCC 23270 were investigated. The results showed that in the presence of 10-2 g/L Tween-80, the growth of A. ferrooxidans and its metabolism on the insoluble substrate S0 and CuFeS2 were promoted. After 24 d of bioleaching, the copper extraction yield of chalcopyrite at 10-2 g/L Tween-80 increased by 16% compared with the bioleaching experiment without Tween-80. FT-IR spectra analysis revealed that the result was probably caused by the extracellular polymeric substances whose composition could be changed by the surfactant addition. RT-qPCR was used to analyze the differential expressions of 17 selected sulfur metabolism relevant genes in response to the addition of Tween-80. Down-regulation of the extracellular protein genes indicated the influence of Tween-80 on bacteria-sulfur adsorption. Variation of the expression level of the enzymes provided a supplement to sulfur metabolism investigation.
文摘基于室温下考马斯亮蓝可发射强而稳定的荧光,Mn2+能灵敏催化过氧化氢氧化考马斯亮蓝使体系的荧光增强,据此建立了Tween-80增敏过氧化氢氧化考马斯亮蓝催化荧光法测定痕量锰的新方法.其线性范围为0.01-2.00(ng/mL),工作曲线的回归方程为△F=2.306+100.6 C Mn2+(ng/mL),相关系数r=0.9989,检出限为7.5×10-12g/mL.本法成功用于自来水和江水中痕量锰(II)的测定.同时探讨了催化过氧化氢氧化考马斯亮蓝离子缔合物荧光反应机理.
