在氧化还原波动期间,的单菌株介导的生物地球化学循环
Song Wang1, Mengqi Wang2, Yifan Chen2
1MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, School of Water Resources and Environment, China University of Geosciences Beijing, Beijing 100083, China; State Key Laboratory of Geomicrobiology and Environmental Changes, Frontiers Science Center for Deep-time Digital Earth, China University of Geosciences Beijing, Beijing 100083, China.
Journal of hazardous materials
|February 5, 2026
概括
一种单一的细菌Bacillus subtilis可以将转化为V(IV) 和V(V) 状态. 这种双向循环是由氧气可用性控制的,影响了环境中的流动性和生物地化学过程.
科学领域:
- 环境微生物学 环境微生物学
- 生物地质化学生物地质化学
- 瓦纳氧化还原循环循环
背景情况:
- 的生物地球化学循环,特别是V (IV) /V (V) 氧化还原转化,对于环境过程至关重要.
- 以前,人们认为不同的微生物可以单独调解V (IV) 氧化和V (V) 减少.
研究的目的:
- 为了研究一个单一的细菌是否可以调解双向的氧化还原转换.
- 阐明氧气供应在控制微生物循环中的作用.
主要方法:
- 在波动的有氧和无氧条件下培养 Bacillus subtilis.
- 量化瓦纳物种度 (V(IV) 和V(V)).
- 分析微生物代谢活动,酶动力学和细胞外聚合物质.
- 采用循环电压测量来研究电子转移机制.
主要成果:
- 细菌细菌表现出双向V (IV) /V (V) 转换,氧化V (IV) 到V (V) 氧化,并减少V (V) 回V (IV) 无氧.
- 在有氧条件下,微生物的活性氧物种生产促进了V(IV) 氧化.
- 氧气的可用性调节了酶活动 (catalase,乳酸脱酶) 和电子载体水平,控制了氧化还原循环的方向和效率.
- 细胞外聚合物物质在的出水和减少中发挥了支持作用.
结论:
- 一种单一的细菌,Bacillus subtilis,可以通过依赖氧的代谢切换独立调节氧还氧循环.
- 这项研究揭示了一种新的生态化学现象,即氧气的可用性决定了微生物转换的方向和效率.
- 这些发现突出了微生物代谢活动在将环境氧气水平与生物地质化学联系起来的重要作用.
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