Bending stiffness of lipid bilayers. II. Spontaneous curvature of the monolayers
نویسنده
چکیده
In the classical formulation of the elastic bending energy stored in a bilayer, the spontaneous curvatures of the monolayers enter via their sum. Accounting for the
منابع مشابه
Elastic curvature constants of lipid monolayers and bilayers.
Bending elasticity is an important property of lipid vesicles, non-lamellar lipid phases and biological membranes. Experimental values of the mean curvature moduli, k(c), of lipid bilayers and of the monolayer leaflets of inverted hexagonal (H(II)) phases of lipids are tabulated here for easy reference. Experimental estimates of the Gaussian curvature modulus, k (c), are also included. Consider...
متن کاملComponents of the lateral pressure in lipid bilayers deduced from HII phase dimensions.
The components of the effective internal lateral pressure arising from the lipid headgroups and the lipid chains in bilayer membranes are deduced from the conditions for interfacial equilibrium and the spontaneous bending moments within the component monolayers. The latter are obtained from the intrinsic curvature that is deduced from X-ray diffraction measurements on the corresponding inverted...
متن کاملBending stiffness of lipid bilayers. III. Gaussian curvature
The Gaussian curvature tern in the expression for the energy density in bending of a lipid bilayer can be decomposed in two terns one symmetric and the other one antisymmetric in the principal curvatures. The symmetric tern is proportional to the square of the mean local curvature. A similar tern has exclusively been used to calculate the equilibrium shape of bilayer structures the topology of ...
متن کاملConformal transformations of vesicle shapes
Vesicles are closed surfaces of lipid bilayers, which form already in simple binary systems of one lipid species plus water [IJ. Studies by video microscopy reveal an amazing variety of shapes, between which transformations can be induced, e.g., by changing the temperature or the osmotic conditions [2-4]. Such experiments confirm the basic theoretical idea that the bending elasticity of the bil...
متن کاملBlocked lipid exchange in bilayers and its possible influence on the shape of vesicles.
The role of lipid exchange in the curvature elasticity of bilayers is studied theoretically. Blocking of exchange between the monolayers may give rise to a nonequilibrium lipid distribution going hand in hand with a spontaneous curvature. Some possible consequences for vesicular deformations are discussed. Lipid nonequilibrium is tentatively suggest as one possible cause for certain shape trans...
متن کامل