TABLE 1.

Product yields and specific rates of glucose consumption, oxygen consumption, and ethanol formation during microaerobic and anaerobic batch cultivation of V5noxE

OTR (mg/liter/h)	Fermentation progress	Product yield (g of product formed or oxygen consumed/g glucose consumed)a,b						Amt of acetoin converted in 2,3-butanediol (%)d	Specific ratea,e
		Oxygenc	Ethanol	Glycerol	Pyruvate	Acetoin	2,3-Butanediol		Glucose consumption (mg/108 cells/h)	Ethanol formation (mg/108 cells/h)	Oxygen uptake (μg/108 cells/h)
20	0.5	7.9 (0.0)	0.40 (0.00)	0.032 (0.01)	0.004 (0.00)	0.063 (0.005)	0.011 (0.000)	16	1.42 (0.02)	0.57 (0.01)	11.2 (0.03)
14	0.5	8.1	0.40	0.035	0.005	0.061	0.010	14	1.39	0.55	10.7
11	0.5	7.8	0.39	0.032	0.006	0.059	0.011	16	1.41	0.58	10.9
9	0.5	4.1	0.46	0.033	0.005	0.045	0.008	15	2.35	1.12	8.44
	0.97	4.4	0.47	0.020	0.001	0.044	0.008	16
5	0.4	1.6	0.46	0.034	0.006	0.031	0.006	16	2.07	1.01	2.79
	1	1.6	0.47	0.021	0.001	0.026	0.010	28
Anaerobic	0.5	0	0.48 (0.000)	0.051 (0.001)	0.002 (0.000)	0	0.005 (0.001)	100	1.51 (0.01)	0.75 (0.02)	0
	1	0	0.49 (0.000)	0.032	0.001 (0.000)	0	0.004 (0.000)	100

^aValues in parentheses are standard deviations calculated from two independent experiments.

^bOnly some metabolites are shown. The carbon recovery (including acetate, acetaldehyde, succinate, 2-oxoglutarate, 2-hydroxyglutarate, CO₂, and biomass) was between 105 and 115%.

^cValues are in mg of oxygen consumed per g of glucose consumed.

^dCalculated as 100 × {[2,3-butanediol]/([acetoin] + [2,3-butanediol])}.

^eAverage of values during the stationary phase.