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The changes of spectroscopic characteristics of sulfurreducing bacteria Desulfuromonas acetoxidans under the influence of different metal ions

机译:不同金属离子影响下还原硫细菌乙酰氧脱硫菌光谱特性的变化

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Desulfuromonas acetoxidans, which is regarded to the oldest microorganisms that exist in the Earth, are uncoloured gram-negative obligatory anaerobic bacteria that have an ability to reduce S° to H_2S. This process supports bacteria with sufficient amount of energy which they need for growth. At the same time high concentrations of hydrogen sulfide are very toxic towards all living organisms. Different metal ions that exist in surrounding environment in small concentrations are essential for microorganisms because they support normal functionality of them. But in high concentrations they have a detrimental influence on cell structure and it functions. Srains of D. acetoxidans bacteria that have high toxic metals resistance can neutralize the toxicity of hydrogen sulfide, which is the final product of dissimilative sulfurreduction, and these metals as the result of their particular binding and forming the insoluble precipitations. Light scattering changes and metals accumulation ability of D. acetoxidans bacterial cells under the influence of CuSO_4, PbNO_3, ZnSO_4 and CdSO_4 have been investigated. The changes of light scattering characteristics of bacterial D. acetoxidans cells on the base of their size distribution and relative content under the influence of investigated metal salts have been observed by the new method of measurement.
机译:乙酸脱硫单胞菌被认为是地球上最古老的微生物,是无色革兰氏阴性必不可少的厌氧细菌,具有将S°还原为H_2S的能力。该过程为细菌提供了生长所需的足够能量。同时,高浓度的硫化氢对所有生物都有剧毒。周围环境中存在的低浓度不同金属离子对微生物至关重要,因为它们支持微生物的正常功能。但是在高浓度下,它们对细胞结构及其功能具有有害影响。具有高毒性金属抗性的乙酰氧梭菌细菌的菌株可以中和硫化氢的毒性,硫化氢是异化硫还原的最终产物,而这些金属由于它们的特殊结合和形成不溶性沉淀而产生。研究了CuSO_4,PbNO_3,ZnSO_4和CdSO_4的影响下醋酸丁酸梭菌细菌细胞的光散射变化和金属积累能力。通过这种新的测量方法,已经观察到细菌醋氧化D.细胞的光散射特性在其大小分布和相对含量的基础上在所研究的金属盐的影响下的变化。

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