TABLE 3.

Labeling of acetate by H¹⁴COOH and ¹⁴CO₂^a

Radiolabeled substrate	Sp act of:
	Acetate	Acetate methyl	Acetate carboxyl
H14COOH	762	593	32
14CO2	858	35	682

^aCultures were incubated for 48 h in 10 ml of B1C medium with a solution of 2 μCi of NaH¹⁴CO₃ or 0.5 μCi of Na¹⁴COOH, 30 mM glucose, and 25 mM formate.