Abstract

Abstract The lamellar repeat distance of multilameller stack of phosphatidylcholine membranes in excess H2O and D2O was determined by small-angle x-ray scattering measurements. When the lipids are in gel-state, the repeat distances in H2O and in D2O are almost the same. When the lipids are in liquid crystalline state, on the contrary, the repeat distances in D2O decrease by ca. 1 Å compared with that in H2O. It is confirmed that the decrease of the repeat distance is due to the decrease of the water layer thickness.

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