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Fig. 9. Relationship between action potential augmentation and K+
channel inactivation. (A) Superposition of initial six action potentials in
Fig. 3 in Chelophyes
appendiculata. (B) Superposition of 10 K+ currents associated
with repetitive short (5 ms) depolarising pulses to +10 mV at 200 ms intervals
in Diphyes chamissonis. The bath solution was N-Ca-free-ASW
containing 10 µmol l–1 TTX, and the pipette solution was
K-asp. Cell membrane capacitance (Cm)=201.2 pF. (C) Decay
of peak K+ current values during repetitive depolarisations
relative to the 1st current obtained from five experiments. Values are means
± S.D. The curve was drawn by fitting the points
with a single exponential function. The time constant was calculated to be
0.46 s.
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