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arXiv 1802.00294physics.bio-ph
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shock waves在脂质单分子膜中的耗散和爆轰

Dissipation and detonation of shock waves in lipid monolayers

Shamit Shrivastava

摘要:

脂质界面不仅划分,而且连接细胞结构内的不同反应中心。这些界面具有明确的比热和压缩比,因此能量可以沿着它们传播,类似于声波。在朗缪尔槽的空气-水界面制备的脂质单分子膜提出了一个很好的模型系统来研究这种传播。在这里,我们建议,最近观察到的二维冲击波中观察到的脂质单层也提供了证据,爆炸的冲击波在这样的接口,即存储在接口中的化学能可以被吸收的传播冲击波前加强它的过程中。为此,我们应用经典理论中的冲击波和爆轰的背景下的脂质界面和热力学状态。基于这些见解,有人声称,所观察到的自维持波在脂质单分子层中表示的爆炸一样的现象,利用潜热的相变的脂质。然而,这些方程的一般性质允许其他可能的化学能量源可以以类似的方式有助于传播冲击波。因此,将理解应用于被认为代表类似现象的神经脉冲传播,以获得对动作电位的幅度和阈值的压力和温度依赖性的定性理解。虽然我们主要讨论的情况下,一个稳定的爆轰,爆轰在接口和相应的热交换的问题进行了简要的讨论,这也表明了雷鸣般的现象在脉冲启动的作用。

英文摘要:

Lipid interfaces not only compartmentalize but also connect different reaction centers within a cell architecture. These interfaces have well defined specific heats and compressibilities, hence energy can propagate along them analogous to sound waves. Lipid monolayers prepared at the air-water interface of a Langmuir trough present an excellent model system to study such propagations. Here we propose that recent observations of two-dimensional shock waves observed in lipid monolayers also provide the evidence for the detonation of shock waves at such interfaces, i.e. chemical energy stored in the interface can be absorbed by a propagating shock front reinforcing it in the process. To this end, we apply the classical theory in shock waves and detonation in the context of a lipid interface and its thermodynamic state. Based on these insights it is claimed that the observed self-sustaining waves in lipid monolayers represent a detonation like phenomena that utilizes the latent heat of phase transition of the lipids. However, the general nature of these equations allows that other possible sources of chemical energy can contribute to the propagating shock wave in a similar manner. Consequently, the understanding is applied to the nerve pulse propagation that is believed to represent a similar phenomenon, to obtain a qualitative understanding of the pressure and temperature dependence of amplitude and threshold for action potentials. While we mainly discuss the case of a stable detonation, the problem of initiation of detonation at interfaces and corresponding heat exchange is briefly discussed, which also suggests a role for thunder like phenomena in pulse initiation.

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