J. Phys. II France 1 (1991) 375-380
Theory of the ripple phase coexistanceM. L. Belaya1, M. V. Feigel'man2 and V. G. Levadny3
1 Institut of Plant Physiology, Botanicheskaya 35, 127276, Moscow, U.S.S.R.
2 Landau Institute for Theoretical Physics, Kosygina 2, 117940 Moscow, U.S.S.R.
3 Institute of Cybernetics, U.S.S.R. Academy of Sciences, Vavilov str. 34, Moscow, U.S.S.R.
(Received 18 September 1990, accepted 13 December 1990)
The macroscopic theory of the competition between two different modifications ( - and /2-phases) of P (ripple) phase in lipid bilayers is presented. It is shown that the increase of the membrane curvature should lead to the phase transition from the /2-phase to the -phase; the critical value of the curvature is obtained as a function of the geometrical parameters of the /2-phase and the free energy difference between both phases in the case of planar membranes. The observed  splitting of disclinations in the /2-phase into well-separated half-integer parts connected by linear defects (of the lenght ) is shown to be related with the smallness of . the relation between and geometrical and thermodynamic parameters of the /2-phase alone is obtained.
© Les Editions de Physique 1991