Grosberg A Iu
Biofizika. 1979 Jan-Feb;24(1):32-7.
A homogenous elastic macromolecule, the so-called persistent model is considered. Possible initiation of dense globular state in it with nematic orderliness of the chain elements is analysed. The entropy of such a system in an arbitrary state is calculated. It is shown that a relatively short rigid chain forms a thoroidal structure. With the chain elongation thor is increased, without changing its proportions. When the parameters are changed the thoroidal structure may turn into the conventional one-linkage one. Possible application of this model for solving the problem of trimeric package of nuclei acids is discussed in a few words.
考虑一种均匀的弹性大分子，即所谓的持久模型。分析了其中可能出现的具有链单元向列有序性的致密球状状态的起始情况。计算了该系统在任意状态下的熵。结果表明，相对较短的刚性链会形成环形结构。随着链的伸长，环增大，但其比例不变。当参数改变时，环形结构可能会转变为传统的单链结构。简要讨论了该模型在解决核酸三聚体包装问题上的可能应用。
