Table 3.

Reversal Potential (Erev) and Permeability Ratios (PK+/PX) for CASTOR

Ion (X)Erev (mV)PK+/PX
Na+17.9 ± 2 (n = 5)2.0a
Ca2+5.0 ± 1 (n = 17)1.4b
  • a Permeability ratios calculated from reversal potentials using equation Erev = RT/zF × ln(PK+[K]o/PNa+[Na]i).

  • b Permeability ratios calculated from reversal potentials using equation Erev= RT/F × ln(√((4PCa2+[Ca]o/PK+[K]i)+1/4) − 1/2), where RT/F = 25.26 mV and Z = 1. The junction potential correction was as follows: KCl-NaCl, Vm = V − 1.1 mV; KCl-CaCl2, Vm = V − 2.3 mV.