涨落诱导的同手性
Fluctuation Induced Homochirality
摘要:
我们提出了一个新的机制,在没有任何自催化的生产过程中,在生活中的同手性。我们的模型包括一个封闭系统中的自发生产与循环交叉抑制。结果表明,虽然该系统的速率方程预测没有手征对称性破缺,随机主方程预测完全同手征。这是因为参与分子的布居数离散性引起的涨落起着至关重要的作用。这种涨落与双螺旋交叉抑制共同实现了同手性。
英文摘要:
We propose a new mechanism for the achievment of homochirality in life without any autocatalytic production process. Our model consists of a spontaneous production together with a recycling cross inhibition in a closed system. It is shown that although the rate equations for this system predict no chiral symmetry breaking, the stochastic master equation predicts complete homochirality. This is because the fluctuation induced by the discreteness of population numbers of participating molecules plays essential roles. This fluctuation conspires with the recyling cross inhibition to realize the homochirality.
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