[Comparison of jumping and electrodiffusion mechanisms of particle movement in thin membranes. I. Statement of the problem. Stationary transfer].

The communication presented is the first in the cycle on comparative analysis of hopping (three barrier) and electrodiffusion description of particle movement in thin membranes. A case of stationary transfer is considered. It is shown that the three barrier hopping description is adequate to the electrodiffusion one when the membrane is non-uniform with a high narrow barrier in the middle. The uniform electrodiffusion description is adequate to the three barrier one only in the cases when the limiting stage is presented by the transfer through a membrane surface or the border of small outer electric fields.