分子拥挤对聚合物在贫溶剂中拉伸行为的影响
Effects of Molecular Crowding on stretching of polymers in poor solvent
摘要：
我们考虑一个线性的聚合物链在无序环境中的逾渗集团模拟的正方形晶格。无序的环境意味着大致代表细胞中所见的分子拥挤。该模型可以被视为细胞中生物聚合物的最简单表示。我们表明存在的中间状态在拉伸过程中产生的分子拥挤的后果。在恒定距离系综中，力-延伸曲线表现出振荡。我们观察到的概率分布曲线中出现的两个或更多的峰，信号的共存不同的状态，并表明过渡是不连续的，不像在分子拥挤的情况下观察到的。
英文摘要：
We consider a linear polymer chain in a disordered environment modeled by percolation clusters on a square lattice. The disordered environment is meant to roughly represent molecular crowding as seen in cells. The model may be viewed as the simplest representation of biopolymers in a cell. We show the existence of intermediate states during stretching arising as a consequence of molecular crowding. In the constant distance ensemble the force-extension curves exhibit oscillations. We observe the emergence of two or more peaks in the probability distribution curves signaling the coexistence of different states and indicating that the transition is discontinuous unlike what is observed in the absence of molecular crowding.
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