TABLE 4.

Effects of pH on the NADH recycling system^a

Initial medium pHb	Glycerol consumed (mM)	End product concn (mM)
		Lactic acid	Acetic acidc	Ethanol
6.5	59.47 ± 0.23	56.19 ± 0.31	22.62 ± 0.46	37.77 ± 1.65
4.5	20.59 ± 0.46	14.98 ± 0.08	46.04 ± 0.56	5.14 ± 0.08

^aValues are means ± standard errors.

^bStrain PM1-pCER-glpFKD-TPI-YqhD was cultured in mMRS medium containing 160 mM glycerol for 24 h under pH-uncontrolled conditions.

^cThe initially available acetic acid amount under each pH condition was 50 mM.