FIGURE 4.

Relationship between the individual H₂O₂ production and the mitochondrial ATP synthesis rates (A). The individual values show five independent mitochondrial preparations from the liver of toad measured at 20°C (white circles), at 25°C (gray circles), and at 30°C (black circles). (B) The oxidative cost of ATP production (% H₂O₂/ATP ratio) calculated at 20°C (white bars), at 25°C (gray bars), and at 30°C (black bars). The values are means ± SEM for N = 5 independent mitochondrial preparations. * and † mean significantly different from 20 and 25°C, respectively (p < 0.05).