微生物
缺氧水域
环境化学
电子受体
无氧呼吸
化学
腐植酸
有机质
电子供体
无氧运动
光化学
细菌
生物
有机化学
生理学
肥料
遗传学
催化作用
作者
Derek R. Lovley,John D. Coates,Elizabeth L. Blunt-Harris,Elizabeth Phillips,Joan C. Woodward
出处
期刊:Nature
[Springer Nature]
日期:1996-08-01
卷期号:382 (6590): 445-448
被引量:1598
摘要
HUMIC substances are heterogeneous high-molecular-weight organic materials which are ubiquitous in terrestrial and aquatic environments. They are resistant to microbial degradation1 and thus are not generally considered to be dynamically involved in microbial metabolism, especially in anoxic habitats. However, we show here that some microorganisms found in soils and sediments are able to use humic substances as an electron acceptor for the anaerobic oxidation of organic compounds and hydrogen. This electron transport yields energy to support growth. Microbial humic reduction also enhances the capacity for microorganisms to reduce other, less accessible electron acceptors, such as insoluble Fe(III) oxides, because humic substances can shuttle electrons between the humic-reducing microorganisms and the Fe(III) oxide. The finding that microorganisms can donate electrons to humic acids has important implications for the mechanisms by which microorganisms oxidize both natural and contaminant organics in anaerobic soils and sediments, and suggests a biological source of electrons for humics-mediated reduction of contaminant metals and organics.
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