Activated diffusions in condensed phases may be classified into two types: specific and non-
specific. A specific activated diffusion depends on a special affinity of the diffusing particle for …

Facilitated diffusion normally involves mobile carriers, reactive groups which react with
specific solutes and diffuse with them across a liquid membrane. Facilitated diffusion can …

It is shown that provided we know or can guess the functional form of the concentration
dependence of the diffusion coefficient, measurements of the time lag in (vacuum) …

This work presents important new evidence that the crosslinked structure of swollen
polymers acts as a molecular screen for diffusion of large solutes. Diffusion experiments of …

An exact solution is obtained for the problem of diffusion through a membrane separating
two stirred solutions of different concentrations. For a diffusion cell in which the two liquid …

A new model is derived to calculate the solute diffusion coefficient through heterogeneous
membranes consisting of a crosslinked, swollen phase and an impermeable, crystalline …

Publisher Summary The primary function of the cell membrane is to separate the interior of
the cell from its external environment. The rapid progress made in the past decade in the …

The importance of the results in connection with a recently proposed method of measuring
variable diffusion coefficients is discussed. Some insight into the nature of the sharp …

Measurements have been made of the rates of diffusion of various non‐electrolytes, and of
water, through a collodion membrane separating a dilute solution from pure water. The …

We feel that the lengthy comments given here come down to a few simple points. For
uniform, homogeneous swollen membranes the internal driving force for transport in …