PLASTICIZED POLYVINYL-CHLORIDE) PROPERTIES AND CHARACTERISTICS OF VALINOMYCIN ELECTRODES - CURRENT TIME RESPONSES TO VOLTAGE STEPS

Approximate analysis of current-line transients in the Kval ion-carrier system can be done for short- and long-time responses. The whole transport problem is nonlinear, but good approximations are possible for fixed-site membranes. A unique value of D//v//a//l, calculated from short- and from long-time data, agrees with the steady-state value already reported. There is no evidence for K** plus hopping; motion of Kval plus from fixed site-to-site with back diffusion of free valinomycin is sufficient to explain transient and steady-state responses.