TABLE 1.

Product profiles of RD-1 cultivated in U_salt medium^a

Substrate	Optical density at 660 nm	Substrate consumed (mM)	Acetate produced (mM)	Ethanol produced (mM)	H2 produced (mmol liter of culture fluid−1)	Acetate/substrate ratiob
H2	0.03	42.5	9.8	NDc	0	0.23 (0.25)
Formate	0.01	15.4	4.7	0	0	0.31 (0.25)
Pyruvate	0.05	3.7	5.7	0	ND	1.54 (1.25)
Glucose	0.41	5.0	9.6	3.3	Trace levels	1.9 (3.0)
Xylose	0.22	5.4	8.7	2.3	Trace levels	1.6 (2.5)

^aLactate was not detected in any culture. Values were corrected with control values obtained from cultures lacking additional substrates and are means of three replicates. The standard deviations were less than 10%. 

^bValues in parentheses are the theoretical acetate-to-substrate ratios if substrates were converted to acetate via the acetyl-CoA pathway. 

^cND, not determined.