Borukhov I, Bruinsma R F, Gelbart W M, Liu A J
Department of Chemistry and Biochemistry, University of California at Los Angeles, California 90095, USA.
Phys Rev Lett. 2001 Mar 5;86(10):2182-5. doi: 10.1103/PhysRevLett.86.2182.
The behavior of mobile linkers connecting two semiflexible charged polymers, such as polyvalent counterions connecting DNA or F-actin chains, is studied theoretically. The chain bending rigidity induces an effective repulsion between linkers at large distances while the interchain electrostatic repulsion leads to an effective short-range interlinker attraction. We find a rounded phase transition from a dilute linker gas where the chains form large loops between linkers to a dense disordered linker fluid connecting parallel chains. The onset of chain pairing occurs within the rounded transition.
理论上研究了连接两个半柔性带电聚合物的可移动连接体的行为，例如连接DNA或F-肌动蛋白链的多价抗衡离子。链的弯曲刚度在远距离时会在连接体之间产生有效排斥力，而链间静电排斥力则导致连接体之间产生有效的短程吸引力。我们发现了一个圆滑的相变，从稀释的连接体气体（其中链在连接体之间形成大环）转变为连接平行链的致密无序连接体流体。链配对的起始发生在圆滑的转变范围内。
