期刊
PHYSICAL REVIEW E
卷 93, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.93.012409
关键词
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资金
- EDISON (EDucation-research Integration through Simulation On the Net) Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2012M3C1A6035363]
- National Institute of Supercomputing and Network/Korea Institute of Science and Technology Information [KSC-2013-C2-017]
- National Research Foundation of Korea [2012M3C1A6035363, 22A20130012547] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Lipid bilayers are a model system for studying the properties of cell membranes. For lipid bilayers of a single lipid component, there is a phase transition from a fluid phase to a gel phase as the temperature is decreased. The dynamic behavior of lipids in the gel phase is interesting: some models show dynamic heterogeneity with a large disparity in timescales between fast and slow molecules, and a spatial segregation of the slow molecules. In this paper we study the dynamics of coarse-grained models of lipid bilayers using the dry Martini, Lennard-Jones Martini, polarizable Martini, and BMW models. All four models show similar dynamical behaviors in the gel phase although the transition temperature is model-dependent. We find that the primary mode of transport in the gel phase is a hopping of the lipid molecules. Hopping is seen in both the translational and rotational dynamics, which are correlated, i.e., the lipid molecules display a swing-like motion in the gel phase.
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