‘Unstirred layers’ in frog skin

Abstract

Estimates of the magnitudes of the unstirred regions associated with isolated frog skin in sulphate Ringer''s solution were made under different stirring conditions. Making an arbitrary but reasonable assumption about the diffusional coefficient of Na2SO4 in the outer unstirred region, the magnitudes of the outer unstirred layers were within the ranges 40-60 [mu], 30-50 [mu] and 30-40 [mu] under stirring conditions of 120, 300 and 500 rev./min., respectively. Making an arbitrary but reasonable assumption about the diffusion coefficient of K2SO4 in the inner unstirred region, the magnitudes of the inner unstirred layers were within the ranges 150-230 [mu], 120-200 [mu] and 100-170 [mu] under stirring conditions of 120, 300 and 500 rev./min., respectively.