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Multiple Interacting Collective Modes and Phonon Gap in Phospholipid Membranes
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-07-19 00:00:00 , DOI: 10.1021/acs.jpclett.8b01658
Giovanna D’Angelo 1 , Valeria Conti Nibali 2 , Ulderico Wanderlingh 1 , Caterina Branca 1 , Alessio De Francesco 3 , Francesco Sacchetti 4 , Caterina Petrillo 4 , Alessandro Paciaroni 4
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We combine Brillouin neutron scattering measurements with recent inelastic X-ray scattering [Zhernenkov et al. Nat. Commun. 2016, 7, 11575] to propose a model for the collective dynamics of phospholipid bilayers. Neutron and X-ray spectra were fitted by the model response function associated with the Hamiltonian of an interacting-phonon system. This approach allows for a comprehensive and unprecedented picture of the vibrational collective features of phospholipids. At low wavevectors Q, the dispersion relations can be interpreted in terms of two acoustic-like modes, one longitudinal and one transverse, plus a dispersionless optic-like mode. The transverse mode of the liquid phase shows a phonon gap that can be linked to a passive transport mechanism through membranes, an interpretation that was proposed in Zhernenkov et al. At higher Q values, the interaction of the longitudinal acoustic excitation with the dispersionless mode gives rise to a pattern that is consistent with avoided-crossing behavior. Evidence is found for a slow- to fast-sound transition, similar to bulk water and other biomolecules.

中文翻译:

磷脂膜中的多种相互作用的集体模式和声子间隙。

我们将布里渊中子散射测量与最近的非弹性X射线散射相结合[Zhernenkov等。纳特 公社 20167,11575]提出一个模型磷脂双分子层的集体动态。中子和X射线光谱通过与相互作用声子系统的哈密顿量相关的模型响应函数进行拟合。这种方法可以对磷脂的振动集体特征进行全面而空前的描述。在低波矢Q,色散关系可以用两种类似声学的模式来解释,一种是纵向的,一种是横向的,再加上一种无色散的类似光学的模式。液相的横向模式显示了一个声子间隙,该声子间隙可以通过膜与被动传输机制相关联,这是Zhernenkov等人提出的一种解释。在较高的Q值下,纵向声激发与无色散模式的相互作用产生了与避免交叉行为一致的模式。已经发现了从缓慢到快速声音过渡的证据,类似于大量的水和其他生物分子。
更新日期:2018-07-19
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