Tarek M, Tobias D J, Chen S H, Klein M L
NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8562, USA.
Phys Rev Lett. 2001 Dec 3;87(23):238101. doi: 10.1103/PhysRevLett.87.238101. Epub 2001 Nov 14.
Short wavelength density fluctuations of hydrated multilamellar phospholipid bilayers have been studied by molecular dynamics simulations in both the gel and liquid crystalline phases, and the results compared to recent inelastic x-ray scattering data [Phys. Rev. Lett. 86, 740 (2001)]. We confirm the existence of a highly dispersive sound mode, whose frequency and damping depend on the lipid phase, that the scattering arises mainly from in-plane motion of hydrocarbon chains, and we also identify a nondispersive mode attributed to motions of the chain terminal carbons.
通过分子动力学模拟研究了水合多层磷脂双分子层在凝胶相和液晶相中的短波长密度涨落，并将结果与最近的非弹性X射线散射数据[《物理评论快报》86, 740 (2001)]进行了比较。我们证实了存在一种高度色散的声模式，其频率和阻尼取决于脂质相，散射主要源于烃链的面内运动，并且我们还确定了一种归因于链末端碳原子运动的非色散模式。
