Time evolution of near membrane layers

The near membrane layer is a region where the concentration of the substanc e transported across the membrane is significantly decreased. Its thickness is defined as a length over which the concentration drops k times with k b eing an arbitrary large number. The time evolution of such a layer is studi ed experimentally by means of the laser interferometric method. It is shown that within the experimental errors the thickness of the near membrane lay er grows in time for any k as a roott with the coefficient a being independ ent of the initial concentration and the membrane permeability. Time evolut ion of the near membrane layers is also analyzed theoretically. The regular ities found experimentally are naturally described within the model which h as been earlier developed by one of us. In particular, a scales as erfc(-1) (1/k).