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NH3/NH4+ and MA/MA+ effects on intracellular pH (pHi) and membrane potential (Vm) in H2O-injected oocytes. Exposing oocytes to 5 mM NH3/NH4+ caused a slow and small decrease in pHi but a large depolarization of the cell (segment ab). On the other hand, exposing the oocyte to 5 mM MA/MA+ caused a small increase in pHi and no depolarization (cd). S, rate of pHi change (dpHi/dt) in pH/s × 10−4.
