Abstract
The minimal concentrations of procaine which block the action potentials of a single Ranvier node were determined under decreased and increased pH in the bathing solution. The changes in concentrations of the basic [B] and cationic [BH+] form of procaine with pH were of monotonic character: [B] drops and [BH+] grows with pH increase. The dependence of membrane excitability (fraction of channels are able to excite) on pH was nonmonotonic; it is low under increased and decreased pH. On the basis of these data the hypothesis that the membrane of the Ranvier node may interact with a definite form of procaine is rejected. T he quantitative analysis shows that the membrane interacts with both the basic and cationic forms of procaine but the efficiency of this interaction is different.
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