A membrane may be defined as a permselective barrier between two homogeneous phases. A molecule or a particle is transported across a membrane from one phase to another because a force acts on that molecule or particle. The extent of this force is determined by the gradient in potential, or approximately by the difference in potential, across the membrane (ΔX) divided by the membrane thickness (l), i.e.
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- Transport in Membranes
- Springer Netherlands