Comp. Biochem. Physiol., 1968, Vol. 24, pp. 679 to 694. Pergamon Press. Printed in Great Britain
NEWS ITEM Journal of Evolutionary Biochemistry and Physiology, Vol. 2, Nos. 2, 3 and 4 Printed in Russian (Leningrad) with English summaries
Lipid a n d Upoproteid membrane models: By G. A. DEBORIN and V. Z. BARANOVA: Institute of Biochemistry of the A c a d e m y of Sciences of the U S S R , Moscow, pp. 90-95. CURRENTviews on composition and structure of biological membranes are discussed. The results of investigations on models are reviewed, particularly concerning protein-lipid and lipoproteid films on different interfaces. An attempt has been made to correlate these observations to processes, responsible for control of enzymatic activity.
Modelling carbohydrate transport through membranes: By A. G. PASYNSKY and L. N. MOISF,EVA: Institute of Biochemistry of the Academy of Sciences of the U S S R , Moscow, pp. 96-101. A MODELof active carbohydrate transport through artificial polymer membranes has been studied in an open system involving two basic factors; (a) an enzymatic reaction transforming the compound supplied from the environment to a ionic form (glucose to glucose phosphate); (b) negative charges present on the membrane preventing reverse diffusion of the ionic produce of the reaction (glucose phosphate). Selective accumulation of glucose is shown to amount to 35-40 per cent of total diffusion transport over a polyacryl membrane having selectivity of 2, while glucose concentration over a sulpho-carboxyl membrane with selectivity amounting to 8 proved to be twice as high as in the medium. Densities of polymer membrane surface charges were measured by the electro-osmosis method. Membrane permeability for ionized compounds is shown to decrease with increasing density of surface charges.
Physical properties of phospholipid membrane models as influenced by e l e c t r i c a l field: By A. V. BABAKOV, L. N. ERMISHKIN and E. A. LmERM~'~: Institute of Biological Physics of the A c a d e m y of Sciences of the U S S R and Physico-Technical Institute, Moscow, pp. 102-108. CoMPt~SSmmia~ under the effect of electrical field has been studied on bi-molecular phospholipid models of cellular membranes. These membranes have been found to display marked and reversible augmentation of capacity on application of direct or alternating field of 0.1 V range. The augmentation of capacity has been shown by an optical method to depend on migration of the thicker parts 679