TABLE 2.

Acetyl-CoA and positive control enzyme activities

Species	Enzyme activity (U [μmol min−1 mg of protein−1])a
	PDH	FDH	CODH	α-KETO
Incomplete oxidizers
D. africanus	0.244 ± 0.019	0.083 ± 0.002	<DL	NAb
D. desulfuricans subsp. desulfuricans	0.329 ± 0.127	1.655 ± 0.086	<DL	NA
D. vulgaris subsp. vulgaris Marberg	0.263 ± 0.013	1.202 ± 0.159	<DL	NA
D. propionicus 1pr3	0.302 ± 0.025	<DL	<DL	NA
D. propionicus MUD	0.045 ± 0.004	<DL	<DL	NA
Desulfobacter strain BG-8	0.253 ± 0.005	<DL	<DL	<DL
Complete oxidizers
D. multivorans 1be1	0.127 ± 0.015	4.667 ± 0.336	1.910 ± 0.049	NA
D. curvatus	0.061 ± 0.009	<DL	<DL	0.494 ± 0.054

^aValues are averages ± standard deviation of three replicate enzyme assays. Average method detection limit (DL) for PDH assay = 0.036 U (n = 11), DL for FDH assay = 0.024 U (n = 8), DL for CODH assay = 0.027 U (n = 12), and DL for α-KETO = 0.025 U (n = 2).

^bNA, not available.