Acetate Threshold Concentrations Suggest Varying Energy Requirements during Anaerobic Respiration byAnaeromyxobacter dehalogenans

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Abstract
Acetate threshold concentrations were determined under chlororespiring and Fe(III)-reducing conditions forAnaeromyxobacter dehalogenansstrain 2CP-C. The acetate threshold concentrations measured were 69 ± 4, 19 ± 8, and Gvalues of −75.4 kJ/mol of electrons for chlororespiration and −41.5 kJ/mol of electrons for amorphous Fe(III) reduction were calculated at the acetate threshold concentration. By comparing threshold concentrations for different metabolisms in a single organism, this study provides insight into the metabolic use of energy under different growth conditions.