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Growth physiology of the wild-type (WT) and hyd and hmc mutant strains in WP medium containing pyruvate (30 mM), sulfate (28 mM), and a headspace of 10% (vol/vol) CO2 and 90% N2. Plotted as a function of time are cell density (A), pyruvate concentration determined enzymatically (open symbols) and acetate concentration (filled symbols) (B), H2 concentration in the headspace (C), and CO concentration in the headspace (D). The symbol definitions in panel A apply to the entire figure.
