Figure 5. After the potentials of axons perfused in bicarb/7.6 became stable, the perfusion medium was switched to nonbicarb/7.6 or nonbicarb/8.0 or was unchanged for 15 min, and then intracellular pH values were calculated from the hydrogen ion (E^pH) and the membrane potential (E^m). Means +/- SD (n = 49). sup **P < 0.01.