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 carboncarbon bonds play a larger and larger part. This gives a reasonable interpretation of deuterium NMR data.
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