Volume 41, Number 3, february I 1998
|Page(s)||261 - 266|
|Published online||01 September 2002|
Elasticity of bilayers containing PEG lipids
French-Bulgarian Laboratory “Vesicles and Membranes” supported
by the CNRS (France) and the Bulgarian Academy of Sciences
2 Institute of Solid State Physics, Bulgarian Academy of Sciences, Laboratory of Liquid Crystals, 72 Tzarigradsko chaussee blvd., Sofia 1784, Bulgaria
3 Biozentrum, Biophys. Chemie, Klingelbergstr. 70, Ch-4056 Basel, Switzerland
4 Centre de Recherche Paul Pascal, CNRS, Av. du Dr. Albert Schweitzer, F-33600 Pessac, France
Accepted: 11 December 1997
The addition of lipids with a poly(ethylene glycol) head group (Stealth or grafted or PEG lipids) to a phosphatidylcholine bilayer changes the mechanical properties of the membrane. We calculate the dependences of the bending and stretching elasticities of the bilayer on the PEG lipid concentration and on the monomer number in its polymer chain. The role of the bending elasticity at blocked flip-flop of the pure bilayer is revealed.
PACS: 07.60.Pb – Conventional optical microscopes / 68.10.-m – Fluid surfaces and fluid-fluid interfaces / 87.10.+e – General, theoretical, and mathematical biophysics (including logic of biosystems, quantum biology, and relevant aspects of thermodynamics, information theory, cybernetics, and bionics)
© EDP Sciences, 1998
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