TABLE 1.

Selected acetate kinetic parameters of D. acetoxidans, D. amnigenus, and the two genera of acetate-degrading methanogens

Organism	Substrate utilization	μmax (day−1)	Vmax (μmol min−1 g of protein−1)	Km (mM)	Threshold concn (μM)	Reference and/ or source
D. acetoxidans	Specialist	0.31–0.41	43 ± 14a	0.6 ± 0.4a	<15	9; this study
D. amnigenus	Generalist	0.14–0.20	28 ± 7a	0.6 ± 0.4a	<15	8; this study
Methanosarcina sp.	Generalist	0.46–0.69	—b	3.0	190–1,180	4, 7
Methanosaeta
M. soehngenii	Specialist	0.08–0.29	76	0.4–0.7	7–69	4, 6, 7
M. concilii	Specialist	0.21–0.69	32	0.8–1.2	—	6, 7
Strain MTAS	Specialist	0.37	170	0.5	—	5, 6
Strain MTKO	Specialist	0.38	98	1.17	—	5, 6

^aMean of four independent experiments ± standard deviation. 

^b—, not determined.