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Additional resources for Sulfur Biogeochemistry - Past and Present (GSA Special Paper 379)
2000. , 2002, Massindependent and mass-dependent sulfur processing throughout the Archean: Geochimica et Cosmochimica Acta, v. 66, p. A655. , 1997, The emergence of life from iron monosulphide bubbles at a submarine hydrothermal redox and pH front: Journal of the Geological Society (London), v. 154, p. 377–402. , 1996, Aeropyrum pernix gen. , sp. , a novel aerobic hyperthermophilic archaeon growing at temperatures up to 100 °C: International Journal of Systematic Bacteriology, v. 46, p. 1070–1077.
5) are exergonic, they generally yield less energy per mole as written than most sulfate-reduction examples discussed above. It should be pointed out, however, that per mole of electrons transferred, these two sets of reactions yield comparable energy, 7–30 kJ/mol e− for S0-reduction and 1–26 kJ/mol e− for sulfate-reduction. P. L. R. 7. 7 consumes 10–58 kJ per mole of electrons transferred. 8) is near equilibrium at all seven sites, yielding less than 13 kJ/mol S0 at each site. 1 is one of the most common metabolic strategies employed in the laboratory by hyperthermophilic chemolithoautotrophs, including archaea and bacteria isolated from Vulcano, it is perhaps surprising that its energy-yield at Vulcano is rather modest, releasing only 26 ± 10 kJ/mol S0.
2003b); here, we reconsider several of the most important S-redox reactions and also compute values of ∆Gr for chemoorganoheterotrophic reactions in which carboxylic acids serve as the electron donors. , 1998). Twenty-five different autotrophic and heterotrophic reactions, divided into four groups, are taken into account here: sulfate-reduction, S0-reduction and -disproportionation, S0-oxidation, and sulfide-oxidation. Nine of the 25 reactions are listed twice, once as the forward and once as the reverse reaction.