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没有外表面细胞染色体的微生物的电生物腐蚀
Dawn E Holmes1,2, Trevor L Woodard1, Jessica A Smith1,3
1Department of Microbiology University of Massachusetts Amherst Amherst Massachusetts USA.
mLife
|June 3, 2024
概括
一些无氧微生物通过电生物腐蚀直接腐蚀金属. 研究人员发现,某些甲基生物和乙基生物可以进行不钢电生物腐蚀,即使没有典型的外表面细胞染色体,也显示出各种微生物策略.
科学领域:
- 微生物的电化学
- 无氧微生物腐蚀是一种无氧微生物腐蚀.
- 生物地质化学生物地质化学
背景情况:
- 含铁金属的无氧微生物腐蚀导致了重大的经济损失.
- 直接的金属到微生物电子转移或电生物腐蚀是关键机制,但由于有限的遗传工具,其在甲基生物和乙基生物中的流行程度尚不清楚.
- 使用316L不钢的呼吸,它不会无生物生成H2,是电生物腐蚀的建议指标.
研究的目的:
- 调查不同无氧甲基生物和乙烯基生物中电生物腐蚀的流行情况.
- 确定从金属直接转移电子的微生物策略.
- 了解乙酸在不钢中由甲基生物引起的电生物腐蚀中的作用.
主要方法:
- 测试了纯Fe0和316L不钢通过各种甲原体 (Methanosarcina vacuolata,Methanothrix soehngenii,Methanobacterium菌株IM1) 和乙原体 (Sporomusa ovata,Clostridium ljungdahlii) 的呼吸.
- 评估了使用Geobacter metallireducens作为电子捐赠者的直接跨物种电子转移 (DIET) 能力.
- 调查了乙酸对电生物腐蚀性甲原体的必要性.
主要成果:
- 所有测试的甲基生物和乙基生物都用纯Fe0.0呼吸.
- 甲松真空酸,甲松索恩格尼和Sporomusa ovata已经证明了不钢的电生物腐蚀.
- 电微生物腐蚀性甲原体需要酸盐来从不钢生产甲,这种酸盐可以通过共同培养中的酸盐来提供.
- 甲基细菌菌株IM1没有进行电生物腐蚀,也没有接受来自Geobacter metallireducens的电子.
- 有能力的电生物腐蚀性微生物缺乏以前认为必不可少的外表面c型细胞染色体.
结论:
- 多种微生物物种,包括甲基生物和乙基生物,能够使用不钢进行电生物腐蚀.
- 乙酸盐的可用性对于使用不钢的电生物腐蚀性甲生物来说至关重要.
- 金属的微生物电生物腐蚀可以通过各种机制发生,不仅仅依赖于外表面的c型细胞染色体.
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