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Ethanol enhances collective dynamics of lipid membranes

Martin D. Kaye, Karin Schmalzl, Valeria Conti Nibali, Mounir Tarek, and Maikel C. Rheinstädter
Phys. Rev. E 83, 050907(R) – Published 25 May 2011

Abstract

From inelastic neutron-scattering experiments and all atom molecular dynamics simulations we present evidence for a low-energy dynamical mode in the fluid phase of a 1,2-dimyristoyl-sn-glycero-3-phoshatidylcholine (DMPC) bilayer immersed in a 5% water/ethanol solution. In addition to the well-known phonon that shows a liquidlike dispersion with energies up to 4.5 meV, we observe an additional mode at smaller energies of 0.8 meV, which shows little or no dispersion. Both modes show transverse properties and might be related to molecular motion perpendicular to the bilayer.

    • Received 18 December 2010

    DOI:https://doi.org/10.1103/PhysRevE.83.050907

    ©2011 American Physical Society

    Authors & Affiliations

    Martin D. Kaye1, Karin Schmalzl2, Valeria Conti Nibali3, Mounir Tarek4,*, and Maikel C. Rheinstädter1,5,†

    • 1Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1 Canada
    • 2Jülich Centre for Neutron Science, Forschungszentrum Jülich, Outstation at ILL, F-38042 Grenoble Cedex 9, France
    • 3Dipartimento di Fisica, Università degli Studi di Messina, I-98100 Messina, Italy
    • 4UMR 7565, Structure et Réactivité des Systèmes Moléculaires Complexes, CNRS-Nancy University, F-54506 Vandoeuvre les Nancy, France
    • 5Canadian Neutron Beam Centre, National Research Council Canada, Chalk River, Ontario, K0J 1J0 Canada

    • *Mounir.Tarek@srsmc.uhp-nancy.fr
    • rheinstadter@mcmaster.ca

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    Issue

    Vol. 83, Iss. 5 — May 2011

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