TABLE 2.

Growth of the W. succinogenes mutants by anaerobic respiration with formate as the electron donor at 37°C

Strain	Doubling timea (h) for growth with:
	Fumarate	Fumarateb	Malateb	Aspartateb	Nitrate + succinate
Wild type	1.3	1.0	1.1	1.2	1.4
DcuA− DcuB− mutant	∞	∞	∞	∞	1.5
DcuA− mutant	2.0	1.3	1.4	1.4	1.5
DcuB− mutant	1.9	1.0	1.0	1.3	1.5
DctQM− mutant	1.7	1.1			2.2

^aAverage of at least five measurements; the standard deviation did not exceed 10%. 

^bThe complex medium also contained brain heart infusion (1.3%, wt/vol) (Gibco BRL).