TABLE 1.

Specific activity of NADH:H₂O₂ oxidase and LDH^a

t (h)	Sp act and absorbance in:
	Nonaerated culture			Aerated culture
	A600	NADH oxidase	LDH	A600	NADH oxidase	LDH
2	0.2	0.56	9.16	0.2	0.56	9.16
2.5	0.42	0.69	8.31	0.40	0.57	9.94
3.5	0.86	0.52	9.28	0.62	0.55	8.09
4.5	1.04	0.67	12.2	0.67	0.51	7.17
6	1.2	0.61	12	0.68	0.75	9.28

^aValues represent specific activity in micromoles of NADH reoxidized per minute per milligram of protein during the growth of L. delbrueckii subsp. bulgaricus in MRS medium with 2% lactose at 42°C in aerated and nonaerated cultures.