TABLE 2.

Distribution of ¹³C in acetate recovered from propionate conversion by S. propionica and M. hungatei after 30 days of incubation

Substrate	Mean concn (mM) of acetate isotope recovered
	[1-13C]	[2-13C]	[1,2-13C]	Unlabeled
[1-13C]propionate	2.5 ± 0.2	2.3 ± 0.1	0.1 ± 0.03	2.1 ± 0.5
[2-13C]propionate	4.7 ± 0.3	0.1 ± 0.03	0.2 ± 0.05	2.1 ± 0.5
[3-13C]propionate	0	5.2 ± 0.2	0	1.7 ± 0.3
[2,3-13C]propionate	2.3 ± 0.2	2.7 ± 0.1	2.6 ± 0.3	0