Fig. 3.

Specific enzyme activities of cell-free extracts of cultures grown with CO, acetate, or formate. a Carbon monoxide dehydrogenase, formate dehydrogenase, and hydrogenase activity measured as hydrogen consumption and as hydrogen production. b NADPH and NADH oxidase activity and CO-dependent reduction of NADP⁺ and NAD⁺. Bars with the same color indicate the activities (average ± SD) for multiple cell-free extract preparations of cultures grown with the same electron donor, see Table S1