Syntrophic Effects in a Subsurface Clostridial Consortium on Fe(III)-(Oxyhydr)oxide Reduction and Secondary Mineralization

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Title:	Syntrophic Effects in a Subsurface Clostridial Consortium on Fe(III)-(Oxyhydr)oxide Reduction and Secondary Mineralization
Authors:	林居慶;Shah, Madhavi;Lin, Chu-Ching;Kukkadapu, Ravi;Engelhard, Mark H.;Zhao, Xiuhong;Wang, Yanping;Barkay, Tamar;Yee, Nathan
Contributors:	工學院環境工程研究所
Keywords:	biomineralization;chemical reduction;Clostridium;Environmental Molecular Sciences Laboratory;fermentation;ferrihydrite;GEOSCIENCES;goethite;growth retardation;hematite;hydrogen;INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY;iron;iron reduction;magnetite;mineralization;peptones;subsurface microbiology;sulfate-reducing bacteria;sulfides
Date:	2014-02-01
Issue Date:	2026-04-23 15:09:48 (UTC+8)
Publisher:	Taylor and Francis Ltd.;United States: Taylor & Francis Group
Abstract:	摘要： In this study, we cultivated from subsurface sediments an anaerobic clostridial consortium that was composed of a fermentative Fe-reducer Clostridium species (designated as strain FGH) and a novel sulfate-reducing bacterium belonging to the clostridia family Vellionellaceae (designated as strain RU4). In pure culture, Clostridium sp. strain FGH mediated the reductive dissolution/transformation of iron oxides during growth on peptone. When Clostridium sp. FGH was grown with strain RU4 on peptone, the rates of iron oxide reduction were significantly higher. Iron reduction by the consortium was mediated by multiple mechanisms, including biotic reduction by Clostridium sp. FGH and biotic/abiotic reactions involving biogenic sulfide formed by strain RU4. The Clostridium sp. FGH produced hydrogen during fermentation, and the presence of hydrogen inhibited growth and iron reduction activity. The sulfate-reducing partner strain RU4 was stimulated by the presence of H 2 and generated reactive sulfide which promoted the chemical reduction of the iron oxides. Characterization of Fe(II) mineral products showed the formation of nanoparticulate magnetite during ferrihydrite reduction, and the precipitation of iron sulfides during goethite and hematite reduction. The results suggest an important pathway for iron reduction and secondary mineralization by fermentative sulfate-reducing microbial consortia through syntrophy-driven biotic/abiotic reactions with biogenic sulfide. Supplemental materials are available for this article. Go to the publisher's online edition of Geomicrobiology Journal to view the supplemental file. 出版者： United States: Taylor & Francis Group 出版日期： 2014-02-07 出處： Geomicrobiology journal, 2014-02, Vol.31 (2), p.101-115 資源來源： Taylor & Francis Online 版權： Copyright Taylor & Francis Group, LLC 2014 識別號： ISSN: 0149-0451 識別號： ISSN: 1521-0529 識別號： EISSN: 1521-0529 識別號： DOI: 10.1080/01490451.2013.806610
Appears in Collections:	[Graduate Institute of Environmental Engineering ] journal & Dissertation

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