Communication: consistent picture of lateral subdiffusion in lipid bilayers: molecular dynamics simulation and exact results

Abstract : This communication presents a molecular dynamics simulation study of a bilayer consisting of 128 dioleoyl-sn-glycero-3-phosphocholine molecules, which focusses on the center-of-mass diffusion of the lipid molecules parallel to the membrane plane. The analysis of the simulation results is performed within the framework of the generalized Langevin equation and leads to a consistent picture of subdiffusion. The mean square displacement of the lipid molecules evolves as ∝ t(α), with α between 0.5 and 0.6, and the fractional diffusion coefficient is close to the experimental value for a similar system obtained by fluorescence correlation spectroscopy. We show that the long-time tails of the lateral velocity autocorrelation function and the associated memory function agree well with exact results which have been recently derived by asymptotic analysis [G. Kneller, J. Chem. Phys. 134, 224106 (2011)]. In this context, we define characteristic time scales for these two quantities.
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Journal articles
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https://hal.archives-ouvertes.fr/hal-00720633
Contributor : Isabelle Frapart <>
Submitted on : Wednesday, July 25, 2012 - 11:46:01 AM
Last modification on : Friday, June 14, 2019 - 3:12:13 PM

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G.R. Kneller, K. Baczynski, M. Pasenkiewicz-Gierula. Communication: consistent picture of lateral subdiffusion in lipid bilayers: molecular dynamics simulation and exact results. Journal of Chemical Physics, American Institute of Physics, 2011, 135 (14), pp.141105. ⟨10.1063/1.3651800⟩. ⟨hal-00720633⟩

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