TABLE 2.

Specific activities of NADH-generating enzymes in cells harvested from menadione-containing and control media at the same growth phase (25 h for control cells and 30 h for menadione-stressed cells)^a

NAD+-dependent enzyme	Sp act (nmol min−1 mg protein−1)a
	Control	Menadione stressed
ICDH-NAD+	55 ± 5	15 ± 3*
a-KGDH	40 ± 4	7 ± 1*
GDH-NAD+	50 ± 7	12 ± 3*
PDH	6 ± 0.3	2 ± 0.2
MDH	11 ± 1	13 ± 1*

^aThe level of NADH was monitored. The values are means ± standard deviations. An asterisk indicates that the P value is ≤0.05 (n = 3).