Fig. 1 (a) shows the mean specific resistance of the casein micelle deposit layer at pH 6.8, 6.2 and 5.9
as a function of transmembrane pressure. An increase in transmembrane pressure results in higher specific
resistances. At low transmembrane pressures (ΔpTM < 0.5 bar) the pressure dependency (slope of the
curve) was highest and identical for pH 6.8 and 5.9. At ΔpTM > 0.5 bar the specific resistance at pH 5.9
showed a stronger pressure dependency than the resistance at the native pH of milk