空间同手性扩散
Homochirality proliferation in space
摘要：
为了更好地理解生物有机体系中的手性选择，提出了一个简单的具有分子扩散的化学反应晶格模型，并利用蒙特卡罗模拟对其进行了研究.除了非手性反应物A与手性产物R和S分子之间的简单随机转化过程之外，当A被一个以上的R（或S）分子包围时，通过提高从A到R（或S）的反应速率来引入非线性自催化。在这种非线性自催化作用下，R和S之间的手征对称性在稠密体系中被破缺。在一个化学惰性溶剂的稀溶液中，分子扩散完成手性选择，只要初始浓度高于临界值。
英文摘要：
To understand the chirality selection in the biological organic system, a simple lattice model of chemical reaction with molecular diffusion is proposed and studied by Monte Carlo simulations. In addition to a simple stochastic process of conversions between an achiral reactant A and chiral products, R and S molecules, a nonlinear autocatalysis is incorporated by enhancing the reaction rate from A to R (or S), when A is surrounded by more than one R (or S) molecules. With this nonlinear autocatalysis, the chiral symmetry between R and S is shown to be broken in a dense system. In a dilute solution with a chemically inactive solvent, molecular diffusion accomplishes chirality selection, provided that the initial concentration is higher than the critical value.
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