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Diversion of Electron Flow from Methanogenesis to Crystalline Fe(III) Oxide Reduction in Carbon-Limited Cultures of Wetland Sediment Microorganisms

By Eric E. Roden

Abstract

Electron flow in acetate-limited cultures of wetland sediment microorganisms was diverted from methane production to Fe(III) reduction in the presence of crystalline Fe(III) oxides at surface area loadings equivalent to that of amorphous Fe(III) oxide. The results indicate that inferences regarding the ability of microbial Fe(III) oxide reduction to compete with other terminal electron-accepting processes in anoxic soils and sediments should be based on estimates of bulk microbially available surface site abundance rather than assumed thermodynamic properties of the dominant oxide phase(s) in the soil or sediment

Topics: Geomicrobiology
Publisher: American Society for Microbiology
Year: 2003
DOI identifier: 10.1128/AEM.69.9.5702-5706.2003
OAI identifier: oai:pubmedcentral.nih.gov:194912
Provided by: PubMed Central
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