Abstract

A model is proposed for hydrocarbon chain dynamics in lipid bilayers. In the upper and middle parts of the chain all motion occurs by concerted rotations around at least two carbon carbon bonds at a time, preserving a structural with kinks (that is gauche ± trans gauche ∓ conformations) as the only deviations from the all- trans chain. At the end, independent rotations around carboncarbon bonds play a larger and larger part. This gives a reasonable interpretation of deuterium NMR data.

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