Abstract
1. Resting membrane potentials were recorded intracellularly from crayfish walking leg muscles. Application of 5, 12 or 15 ppm naphthalene produced a reversible hyperpolarization of membrane potential to 150% of normal resting level. 2. Excitatory postsynaptic potentials (SPSPs) were recorded following nerve stimulation and found to be significantly increased in amplitude following naphthalene (5 ppm) addition. 3. Membrane hyperpolarization was unaffected by tetraethylammonium chloride (TEA), but eliminated by ouabain suggesting that naphthalene may act via stimulation of an electrogenic membrane pump.
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