Refer to the table below to calculate the net free energy change when anaerobic butyrate...

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Refer to the table below to calculate the net free energy change when anaerobic butyrate metabolism is coupled to methanogenesis 136 kJ mol TABLE 13 6 Syntrophy Reactions Producing and Consuming H Genus Reaction 3H reduces an oxidant HCO SO or NO3 Methanospirillum Desulfovibrio Desulfovibrio Syntrophic catabolism producing H Syntrophus Syntrophomonas 4H HCO3 H CH 3H O 4H SO H HS 4H O 4H NO3 2H NH 3H O Benzoate 7H O 3 acetate HCO3 3H 3H Butyrate 2H O 2 acetate H 2H kJ mol a 136 152 600 70 49 Oxidant for syntrophy HCO3 25 AG kJ mol b 5 So NO3 2 45 33 13 18 AG is the standard free energy change at pH 7 when the concentrations of reactants and products are the same PAG was the measured free energy change at pH 7 when syntrophic metabolism stopped Michael McInerney et al 2007 PNAS 104 7600 Ralf Cord Ruwisch et al 1988 Arch Microbiol 149 350 Bradley E Jackson and Michael J McInerney 2002 Nature

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