title: What are the true values of the bending modulus of simple lipid bilayers?
abstract: Values of the bending modulus KC are reviewed, and possible causes for the considerable differences are discussed. One possible cause is the use of glucose and sucrose in the classical micromechanical manipulation and shape analysis methods. New data, using the more recent low angle X-ray method, are presented that do not support an effect of glucose or sucrose on KC. Another possible cause is using an incomplete theory to interpret the data. Adding a tilt term to the theory clearly does not affect the value obtained from the shape analysis method. It is shown that a tilt term, using a value of the modulus Kθ indicated by simulations, theory, and estimated from order parameters obtained from NMR and from the wide angle X-ray method, should also not affect the value obtained using the micromechanical manipulation method, although it does require a small correction when determining the value of the area compressibility modulus KA. It is still being studied whether including a tilt term will significantly affect the values of KC obtained using low angle X-ray data. It remains unclear what causes the differences in the experimental values of KC for simple lipid bilayers.
authors.affiliation: Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA. Electronic address: nagle@cmu.edu.
authors.forename: John F
authors.initials: JF
authors.lastname: Nagle
authors.affiliation: Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
authors.forename: Michael S
authors.initials: MS
authors.lastname: Jablin
authors.affiliation: Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
authors.forename: Stephanie
authors.initials: S
authors.lastname: Tristram-Nagle
authors.affiliation: Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Akabori
mesh_terms: D001696:Biomechanical Phenomena; D008051:Lipid Bilayers / Q000737:chemistry / Q000378:metabolism; D055595:Mechanical Phenomena; D008954:Models, Biological; D014961:X-Ray Diffraction
chemical_list: D008051:Lipid Bilayers
keywords: Area compressibility modulus; Bending modulus; DOPC; Lipid bilayers; Membrane mechanics; Tilt modulus
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