Abstract
Currents through ion channels are determined (among other parameters)
by the concentration difference across the membrane containing the
channel and the diffusive transport of the conducted ion toward the
channel and away from it. Calculation of the current requires solving
the diffusion equation around the channel. Here, we provide a quasi-steady
approximation for the current and the local concentrations at the
channel together with formulas linking the current and local concentrations
at the channel to bulk concentrations and diffusion properties of
the compartments.
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