Cēbers A, Dogic Z, Janmey P A
Institute of Physics, University of Latvia, Salaspils-1, LV-2169, Latvia.
Phys Rev Lett. 2006 Jun 23;96(24):247801. doi: 10.1103/PhysRevLett.96.247801. Epub 2006 Jun 21.
The formation of kinks in a loop of bundled polyelectrolyte filaments is analyzed in terms of the thermal fluctuations of charge density due to polyvalent counterions adsorbed on the polyelectrolyte filaments. It is found that the counterion-mediated attraction energy of filaments depends on their bending. By consideration of curvature elasticity energy and counterion-mediated attraction between polyelectrolyte filaments, the characteristic width of the kink and the number of kinks per loop is found to be in reasonable agreement with existing experimental data for rings of bundled actin filaments.
根据吸附在聚电解质细丝上的多价抗衡离子引起的电荷密度热涨落，分析了成束聚电解质细丝环中扭结的形成。发现细丝的抗衡离子介导的吸引能取决于它们的弯曲。通过考虑曲率弹性能和聚电解质细丝之间的抗衡离子介导的吸引，发现扭结的特征宽度和每个环中的扭结数量与成束肌动蛋白细丝环的现有实验数据合理吻合。
