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定向远距离电子传输从降解到氧化区域在地下表面

Yanting Zhang¹, Man Tong^1,2, Yuxi Lu¹

¹State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, China.

Nature communications

|August 3, 2024

概括

长距离电子转移 (ET) 在地下沉积物中发生在10厘米以上,形成了一系列反应. 这一由微生物和化学介导的过程,为生物地球化学循环提供了远程电子源.

科学领域:

地质化学地质化学
环境科学环境科学
微生物学微生物学

背景情况:

电子转移 (ET) 对生命和元素循环至关重要,通常发生在短距离 (nm-μm) 上.
地下氧化还原梯度可以跨越数米,在典型的ET距离和梯度长度之间产生差距.
沿着这些梯度的远距离外星人的存在和机制在很大程度上仍未被探索.

研究的目的:

为了研究沿着地下氧化还原梯度从降解到氧化区域的定向长距离电子转移 (ET) 的可能性.
量化这种远距离ET过程的范围和流量.
了解微生物和化学因素在促进这种ET的中介作用.

主要方法:

利用电子捐赠能力的变化作为衡量ET的代理.
在沉积物柱中进行的实验,以模拟地下氧化还原梯度.
分析了对ET链的微生物和化学贡献.

主要成果:

证明了沿着氧化还原梯度延伸超过10厘米的定向长距离ET.
确定了一系列短距离电子跳跃反应,促进了这种转移.
估计每天的ET流量为6.73μmol e-/cm2.
通过微生物和化学过程展示了协同作用的调解.

结论:

长距离的定向ET沿地下氧化还原梯度发生,弥合了减少区和氧化区之间的差距.
这个过程是由一系列微生物和化学反应促进的.
远距离的ET作为一个重要的,以前被忽视的"远程"电子来源,用于地下生物地质化学和环境过程.

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