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1. The temperature dependence of the sodium and potassium conductances of Myxicola giant axons was studied in the range of 1-18° C.
2. Analysis of voltage clamp records for step depolarizations of 20-150 mV yielded Q10's for
Na,
K, and g1 of 1·3-1·5. The steady-state parameters m
(v), n
(v) were independent of temperature. The time constants had Q10's of: 2·64 ± 0·2 for
m; 2·56 ± 0·2 for
h; 3·02 ± 0·3 for
n.
3.
h determined from the effects of prepulse duration rather than the decline in sodium current during a step depolarization had a Q10 of 2·47 ± 0·2.
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