Fig. 5. K⁺ influx into trout hepatocytes as a function of oxygen concentration. (A) Active and passive components of K influx as a function of oxygen concentration. Active K⁺ influx was calculated as difference in K⁺(⁸⁶Rb) uptake in the presence or in the absence of 100 µmol l^-1 ouabain. Cells were incubated at different oxygen concentrations for 15 min. Data are means of five independent experiments ± S.E.M. According to the results of Dunnett multiple comparison test (one-way ANOVA), ^*P<0.05 and ^**P<0.01 when compared with 21% O₂ `control'. (B) Kinetics of the changes in active K⁺ influx and cellular ATP levels in trout hepatocytes exposed to 1% O₂. Data are means ± S.E.M. of four or five independent experiments. ^*P<0.05.