Ethanol enhances collective dynamics of lipid membranes

被引：20

作者：

Kaye, Martin D. ^{[1
]}

Schmalzl, Karin ^{[2
]}

Nibali, Valeria Conti ^{[3
]}

Tarek, Mounir ^{[4
]}

Rheinstaedter, Maikel C. ^{[1
,5
]}

机构：

[1] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

[2] Forschungszentrum Julich, Julich Ctr Neutron Sci, Outstn ILL, F-38042 Grenoble 9, France

[3] Univ Messina, Dipartimento Fis, I-98100 Messina, Italy

[4] Nancy Univ, CNRS, UMR 7565, F-54506 Vandoeuvre Les Nancy, France

[5] Natl Res Council Canada, Canadian Neutron Beam Ctr, Chalk River, ON K0J 1J0, Canada

来源：

PHYSICAL REVIEW E | 2011年 / 83卷 / 05期

基金：

加拿大自然科学与工程研究理事会;

关键词：

SHORT-RANGE ORDER; PHOSPHOLIPID-BILAYERS; X-RAY; PERMEABILITY; PERMEATION;

D O I：

10.1103/PhysRevE.83.050907

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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.

引用

页数：4

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