Average single-channel conductance, G, of Delta toxin and Beta toxin in different salt solutions.

The membranes were formed of 1% PC dissolved in n-decane. The aqueous solutions were buffered with 10 mM Tris-HCl and had a pH of 7. The applied voltage was 20 mV and the temperature was 20°C. The average single-channel conductance, G, was calculated from at least 80 single events derived from measurements of at least four individual membranes. n. m.: not measured.