Table 2.

Respiratory chain enzyme activities in S. cerevisiae and chicken liver.

Q2		Activity	SD	Inh. %
S. cerevisiae	NADH	404	121	59
	SDH	146	3	95
	QCR	840	20	87
Chicken liver	NADH	39	6	47
	SDH	16	1	100
	QCR	540	40	67

Activities [U] of individual enzymes are defined in Figure 2; Q₂ – Coenzyme Q₂ used as a substrate for activity measurement. NADH – NADH dehydrogenase; SDH – succinate dehydrogenase; QCR – cytochrome c reductase; SD – standard deviations; Inh. – the rate of inhibition with the corresponding inhibitor in %: NADH – DPI for S. cerevisiae which do not possess complex I and rotenone for chicken liver; SDH – sodium malonate and QCR – antimycin A.