By P. Meares (auth.), Privat-Dozent Dr. Ulrich Zimmermann, Professor Dr. Jack Dainty (eds.)
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The potential gradient inside the membrane is a diffusion potential caused by concentration gradients and different mobilities of the mobile ion species. Although the outer phases of the membrane are under equal pressure a pressure gradient is formed inside the membrane. At the phase boundaries membrane/solution there exist pressure jumps because the concentrations of osmotically active ions inside the membrane phase are always greater than those in the outer phase. Both pressure jumps can be interpreted as osmotic equilibrium pressure (SCH LOG L, 1955).
Auch im nichtlinearen Bereich, an einem speziellen Membransystem. Doktorarbeit. Frankfurt 1971 WOERMANN. • Ber. Dtsch. Bot Ges. 431-443 (1969) Coupling of Mass Transfer and Chemical Reaction across an Asymmetric Sandwich Membrane J. Meyer, F. Sauer, and D. Woermann A. Introduction and Theoryl) It has been very difficult to incorporate active transport within the framework of irreversible thermodynamics. At first sight, it is hard to understand how it is possible that a chemical reaction forces a flow of an inert substance in a certain direction .
It was therefore not possible to measure the volume flow. The experiment was restricted to the measurement of the active EMF. In addition, the pressure difference in the stationary state and the concentration of KCI in the fluid membrane phase were determined. 1 M. All quantities measured are linearly dependent on the concentration of sucrose in the bulk phases (Figs. 5 and 6). The flow of sucrose through the membranes is so small that the enzymic reaction, being far from saturation, approximately obeys first order kinetics.