We investigate a mechanical model for the DNA molecule using an extension of the Peyrard and Bishop model. In the present model, there are two chains of oscillators linked by a Morse potential, which represent the hydrogen bonds. The rotational and vibrational motions of each base pair are considered and the coupling for these motions are introduced by a nonlinear combination of them in the Morse potential. In this context, thermodynamics and structural properties are discussed.

中文翻译：

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DNA分子的振动和旋转运动耦合模型

我们使用 Peyrard 和 Bishop 模型的扩展来研究 DNA 分子的机械模型。在本模型中，有两条振荡器链由莫尔斯势连接，代表氢键。考虑了每个碱基对的旋转和振动运动，并且这些运动的耦合是通过它们在莫尔斯电势中的非线性组合引入的。在这方面，讨论了热力学和结构特性。