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زیست شناسی::
مولکول لیپید
Each lipid molecule or protein has a preferred surface area so, unlike the surface of a fluid, the plasma membrane is, for practical purposes, inextensible.
In lipid molecules, the relative head group versus tail geometry is in fact respon- sible for favoring different lipid orientations which determine the curvature stress.
A quantitative shape concept involves a determination of the free energy per lipid molecule when it occupies a given molecular volume of a given shape [15].
Energetics of the lipid molecule assembly into various lipid phases is case spe- cific, and it was shown [7] that the energetic contributions to the total free energy determining the lipid membrane conformation come from the properties of lipid monolayers and the participating lipids.
consider E(H) and E(L) to be the free energies per lipid molecule in the inverse hexagonal and lamellar phases respectively, all phase boundaries representing the lamellar-inverse hexagonal phase transition are determined by the free energy change (6E E(H) E(L)).
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