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- W2097017831 endingPage "210" @default.
- W2097017831 startingPage "183" @default.
- W2097017831 abstract "A tenet of geomicrobiology is that anaerobic life in the subsurface arranges itself into zones, according to a thermodynamic ladder. Iron reducers, given access to ferric minerals, use their energetic advantage to preclude sulfate reduction. Sulfate reducers exclude methanogens in the same way, by this tenet, wherever the environment provides sulfate. Examining usable energy---the energy in excess of a cell9s internal stores---in subsurface environments, we find that in groundwater of near neutral pH the three functional groups see roughly equivalent amounts. Iron reducers hold a clear energetic advantage under acidic conditions, but may be unable to grow in alkaline environments. The calculations fail to identify a fixed thermodynamic hierarchy among the groups. In long-term bioreactor experiments, usable energy did not govern microbial activity. Iron reducers and sulfate reducers, instead of competing for energy, entered into a tightly balanced mutualistic relationship. Results of the study show thermodynamics does not invariably favor iron reducers relative to sulfate reducers, which in turn do not necessarily have an energetic advantage over methanogens. The distribution of microbial life in the subsurface is controlled by ecologic and physiologic factors, and cannot be understood in terms of thermodynamics alone." @default.
- W2097017831 created "2016-06-24" @default.
- W2097017831 creator A5000614503 @default.
- W2097017831 creator A5010421859 @default.
- W2097017831 creator A5025515390 @default.
- W2097017831 creator A5050339093 @default.
- W2097017831 creator A5065484009 @default.
- W2097017831 date "2011-03-01" @default.
- W2097017831 modified "2023-10-03" @default.
- W2097017831 title "The thermodynamic ladder in geomicrobiology" @default.
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