Mass-average water separation and parameters for short-range repulsion derived from x-ray diffraction studies

Range Table - link
Organism Generic
Reference Evan. Evans, David. Needham, Physical properties of surfactant bilayer membranes: thermal transitions, elasticity, rigidity, cohesion and colloidal interactions. J. Phys. Chem., 1987, 91 (16), pp 4219–4228 DOI: 10.1021/j100300a003 link p.4226 table IV
Primary Source [59] Rand, R. P. Parsegian, V. A., to be submitted for publication. [as of publication date of article]
Method P.4219 left column bottom paragraph: "In this article, [investigators] discuss how mixtures of lipids, cholesterol, and polypeptides affect the thermal-mechanical and colloidal interaction properties of bilayer membranes. [They] outline prominent physical features of bilayer membrane materials as solid and liquid surface structures. [They] examine how amphiphilic mixtures influence membrane cohesion and colloidal attraction. Finally, [they] evaluate the efficacy of classical prescriptions for van der Waals attraction and electric double-layer repulsion to correlate measured free energy potentials for adhesion. Lipids from two classes are discussed: phospholipids (phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylserine (PS), and phosphatidylglycerol (PG)) and a “sugar” lipid (digalactosyl diacyl glycerol (DGDG)). The former are ubiquitous constituents of animal cell membranes whereas the latter exists predominantly in plant cell membranes."
Comments P.4226 right column bottom paragraph: "If [investigators] accept an exponential form for the short-range repulsion, attenuation of the adhesion energy by repulsion is about 10-40% based on the parameters in Table IV: coefficients for attraction must be increased by about 50% to match the measured adhesion energies." SOPC=1-stearoyl-2-oleoylphosphatidylcholine. POPE=1-palmitoyl-2-oleoylphosphatidylethanolamine.
Entered by Uri M
ID 112591