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Sulfur-mediated electron shuttling during bacterial iron reduction.
- Source :
-
Science . 5/30/2014, Vol. 344 Issue 6187, p1039-1042. 4p. - Publication Year :
- 2014
-
Abstract
- Microbial reduction of ferric iron [Fe(III)] is an important biogeochemical process in anoxic aquifers. Depending on groundwater pH, dissimilatory metal-reducing bacteria can also respire alternative electron acceptors to survive, including elemental sulfur (S0). To understand the interplay of Fe/S cycling under alkaline conditions, we combined thermodynamic geochemical modeling with bioreactor experiments using Shewanella oneidensis MR-1. Under these conditions, S. oneidensis can enzymatically reduce S0 but not goethite (α-FeOOH). The HS- produced subsequently reduces goethite abiotically. Because of the prevalence of alkaline conditions in many aquifers, Fe(III) reduction may thus proceed via S0-mediated electron-shuttling pathways. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ELECTROPHILES
*THERMODYNAMIC cycles
*GOETHITE
*AQUIFERS
*SHEWANELLA oneidensis
Subjects
Details
- Language :
- English
- ISSN :
- 00368075
- Volume :
- 344
- Issue :
- 6187
- Database :
- Academic Search Index
- Journal :
- Science
- Publication Type :
- Academic Journal
- Accession number :
- 96377397
- Full Text :
- https://doi.org/10.1126/science.1252066