论文标题
DNA链的弹性，点缀着气泡
Elasticity of a DNA chain dotted with bubbles under force
论文作者
论文摘要
显示柔韧性和沿力方向的延伸与气泡数的波动有关，而气泡的平均数量分别与DNA的链沿着同一方向持续力时，我们称之为拉伸力。力 - 温度相图显示了三临界点（TCP）的存在，其中一阶力诱导的拉链跃迁变得连续。另一方面，当力在相反的方向上施加力时，我们称之为解压缩力，过渡仍然是一阶，并且有可能消失在半融合的DNA中低温重入相。此外，我们发现仅当外力穿透界相并影响气泡状态时，大量弹性才会改变
The flexibility and the extension along the direction of the force are shown to be related to the bubble number fluctuation and the average number of bubbles respectively, when the strands of the DNA are subjected to a force along the same direction, here we call a stretching force. The force-temperature phase diagram shows the existence of a tricritical point (TCP), where the first-order force induced zipping transition becomes continuous. On the other hand, when the forces are being applied in opposite directions, here we call an unzipping force, the transition remains first-order,with the possibility of vanishing of the low-temperature re-entrant phase for a semiflexible DNA. Moreover, we found that the bulk elasticity changes only if an external force penetrates the bound phase and affect the bubble states
