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A high flux anisotropic (“skinned”) protein concentrating membrane made of cellulose acetate is described. Its method of preparation is given and the influence of the thickness of the membrane on its flux determined. The membrane's characteristics under different pressures and when ultrafiltering protein solutions of varying concentration are studied. A slightly denser variant of the same membrane, useful for the concentration of some of the smaller pathological serum proteins, is also described. The characteristics of both new membranes are compared with those of some of the commercially available membranes.
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Oss et al. (1970) studied this question.
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