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Fig. 4. Cumulative changes in pHi (
pH) and in proton load (
P) due to
changes in [PCr] (expressed in µmol g-1 wet mass) at (A)
15°C and (B) 25°C. The data are related to the different experimental
pHe (black, 7.9; white, 7.3; grey, 7.0). Point zero (the origin of the axis)
corresponds to the values registered at the beginning of the experiments. The
diagonal lines through the origin, calculated in the range where the change in
pH was due solely to changes in [PCr], have a slope equal to -1/ß (see
text).