Diversion of electron flow from methanogenesis to crystalline Fe(III) oxide reduction in carbon-limited cultures of wetland sediment microorganisms.
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.
Roden
Eric E
EE
Department of Biological Sciences, The University of Alabama, Tuscaloosa, Alabama 35487-0206, USA. eroden@bsc.as.ua.edu
D004579:Electron Transport; D005290:Ferric Compounds / Q000378:metabolism*; D019015:Geologic Sediments / Q000382:microbiology*; D007700:Kinetics; D008697:Methane / Q000378:metabolism*; D010084:Oxidation-Reduction
D005290:Ferric Compounds; C000499:ferric oxide; D008697:Methane