By A. J. Staverman (auth.), F. Kreuzer, J. F. G. Slegers (eds.)
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Additional info for Biomembranes : Passive Permeability of Cell Membranes: A satellite symposium of the XXV Internationational Congress of Physiological Sciences, Munich, Germany, July 25–31, 1971, organized by the Department of Physiology, University of Nijmejen, Nijmejen,
8 constants altogether. We used however only one overall association and dissociation constant for simplicity; computations showed that the deviation induced by this simplification as against the full four-step treatment was only of the order of a few percent. The carriers Hb and Mb differ in the following points: Mb consists of one 46 F. C. , the binding curve is much steeper than that of Hb. 3 x 10 9 about 20 Computation shows that the general effect of changes in k is small for the system Hb and oxygen.
The molar concentration of Hb in the red cells is about 50 times and that of Mb in many muscles about 10 times higher than the molar concentration of dissolved oxygen. On the other hand the diffusion coefficient of Hb, 0Hb' is about 100 times smaller than the diffusion coefficient of 02' 002' at the Hb concentration present in the red cells and the diffusion coefficient of Mb, 0Mb' may be 10-20 times smaller according to the conditions in the muscles (see below). Since the flux is proportional to the product of the diffusion coefficient and the molar concentration, the fluxes of the two pigments may be of comparable magnitude as those of oxygen in physiological conditions (Kreuzer, 1970; Wittenberg, 1970).
100Al) 5 Figure 4. 98 x 10- 7 cm 2 /sec. The three pairs of curves are indicated by the same line symbols. The curves are drawn to scale for the flux contribution. P0 2 = 10 vs. 0 mm Hg. k' = 14 x 10 9 ml/M/sec. k = 11 sec-I. 48 F. C. HOOFD The effective thickness or actual diffusion path of the layer is often uncertain because the liquid space and the tortuosity of the channels are unknown. , the diffusing particles move around obstacles arranged at random. From this we deduced that the mean diffusion path should be 57% longer than the physical membrane thickness, in our case 150 p + 57% = 235 p.