Sulfur-mediated electron shuttling during bacterial iron reduction.
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| Title: | Sulfur-mediated electron shuttling during bacterial iron reduction. |
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| Authors: | Flynn, Theodore M., O'Loughlin, Edward J., Mishra, Bhoopesh, DiChristina, Thomas J., Kemner, Kenneth M. |
| Source: | Science (pre-March 2025). 5/30/2014, Vol. 344 Issue 6187, p1039-1042. 4p. |
| Subjects: | Electrophiles, Thermodynamic cycles, Goethite, Aquifers, Shewanella oneidensis |
| 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] |
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| Database: | Psychology and Behavioral Sciences Collection |
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