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arXiv 1003.1269cond-mat.stat-mech
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柔性分子中温度无关跃迁的新机制:热力学涨落的作用

Novel mechanism for temperature-independent transitions in flexible molecules: role of thermodynamic fluctuations

V. I. Teslenko, E. G. Petrov, A. Verkhratsky, O. A. Krishtal

摘要:

提出了一种新的物理机制来解释分子体系中与温度无关的转变反应。该机制成为有效的情况下,准等能分子状态之间的构象转变。结果表明,在室温下,分子能级的随机加宽占主导地位的能量的低频振动伴随着过渡。这导致取消的温度依赖性的随机平均速率常数。作为一个例子,物理解释的温度无关的P2X_3受体脱敏神经元膜的发病提供。

英文摘要:

Novel physical mechanism is proposed for explanation of temperature-independent transition reactions in molecular systems. The mechanism becomes effective in the case of conformation transitions between quasi-isoenergetic molecular states. It is shown that at room temperatures, stochastic broadening of molecular energy levels predominates the energy of low frequency vibrations accompanying the transition. This leads to a cancellation of temperature dependence in the stochastically averaged rate constants. As an example, physical interpretation of temperature-independent onset of P2X_3 receptor desensitization in neuronal membranes is provided.

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