电流扰乱了定义的联盟中的电子转移
Mon Oo Yee1,2, Lars D M Ottosen3, Amelia-Elena Rotaru1
1Nordcee, Department of Biology, University of Southern Denmark, Odense, Denmark.
Microbial biotechnology
|December 9, 2023
概括
使用定位阴极对无氧消化器的电刺激通过阻碍直接的物种间电子转移 (DIET) 对甲生产产生负面影响. 这项研究表明,替代的电子捐赠者破坏了微生物的合作关系,降低了整体效率.
科学领域:
- 微生物电化学技术 微生物电化学技术
- 厌氧消化 厌氧消化
- 微生物生理学 微生物生理学
背景情况:
- 微生物电化学技术旨在通过电流应用在无氧消化器中增强甲生产.
- 直接跨物种电子转移 (DIET) 被提议用于提高甲产量,但其在定义的联盟中在电刺激下的机制尚不清楚.
- 之前的研究依赖于物种共发生,缺乏对阴极对饮食影响的详细洞察力.
研究的目的:
- 调查来自定位阴极的连续和不连续电流对定义的DIET联盟 (Geobacter metallireducens和Methanosarcina barkeri) 的影响.
- 为了比较电化学刺激的DIET群体与未暴露的对照者的生理学.
- 了解阴极电子捐赠如何影响物种间电子转移和代谢活动.
主要方法:
- 在平衡阴极条件下 (-0.7V与SHE) 培养一个定义的微生物联盟 (Geobacter metallireducens和Methanosarcina barkeri).
- 在暴露电流和未暴露反应堆之间比较代谢活性,细胞数量和用于甲生产的电子回收.
- 对中间代谢物 (乙酸盐,) 和整体电子分配的分析.
主要成果:
- 电刺激导致两种微生物合作伙伴的代谢活动和细胞数量下降.
- 在刺激的联盟中,甲生产效率显著下降 (32%的电子回收),随着乙酸和的积累.
- 未暴露的对照组有效地将乙醇转化为甲 (88%的电子回收).
结论:
- 使用定位阴极的电化学刺激对被研究的DIET联盟产生不利影响.
- 作为替代电子供体的阴极干扰了从Geobacter到Methanosarcina的高效电子转移,并诱导了代谢抑制.
- 了解特定的DIET相互作用对于优化微生物电化学技术中的甲生产至关重要.
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