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      Interpreting membrane scattering experiments at the mesoscale: the contribution of dissipation within the bilayer.

      1 ,
      Biophysical journal

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          Abstract

          Neutron spin-echo spectroscopy provides a means to study membrane undulation dynamics over length scales roughly spanning 10-100 nanometers. Modern interpretation of these measurements relies on the theoretical predictions of Zilman and Granek; however, it is necessary to introduce an anomalously large solvent viscosity within this theory to obtain quantitative agreement with experiment. An extended theoretical treatment is presented that includes the effects of internal dissipation within the bilayer. Within the length and time regimes appropriate to neutron spin-echo experiments, the results of Zilman and Granek are largely recovered, except that the bilayer curvature modulus kappa appearing in their theory must be replaced with an effective dynamic curvature modulus kappa =kappa+2d(2)k(m), where d is a distance comparable to the monolayer thickness (the height of the neutral surface from bilayer midplane) and k(m) is the monolayer compressibility modulus. Direct comparison between theory and experiment becomes possible without any rescaling of physical parameters.

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          Author and article information

          Journal
          Biophys. J.
          Biophysical journal
          1542-0086
          0006-3495
          Mar 17 2010
          : 98
          : 6
          Affiliations
          [1 ] Department of Chemistry and Biochemistry, University of California, Santa Barbara, California, USA. maxcw@physics.ucsb.edu
          Article
          S0006-3495(09)01755-X
          10.1016/j.bpj.2009.11.026
          2849052
          20303849
          8c2f3959-680b-4abd-937f-012d8a870be9
          Copyright 2010 Biophysical Society. Published by Elsevier Inc. All rights reserved.
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