A modified two-tolerate (2T) SAW polymer model is carried on the Husimi tetrahedron lattice to describe the DNA/RNA-like biomacromolecules. With a simplified assemble of configurations to catch the zipping/unzipping feature of intra-pair-able polymer chains, the thermodynamics are exactly derived via the recursive property of Husimi lattice. The probability(density) of monomers in single and paired strands, and solvent are calculated from recursive partial partition functions to characterize the phase diagrams. The model is found to be a practical setup fitting both DNA- and RNA-like polymers, with rich phase diagrams presenting the DNA/RNA-like regions and the unwinding/polymerase transitions. An intriguing equilibrium is found to separate DNA- and RNA-like regions with a particular parameters setup, where the single and double strands co-exist in the system with constant densities regardless of temperature.

在Husimi四面体晶格上进行了修饰的二耐受（2T）SAW聚合物模型，以描述DNA / RNA样的生物大分子。通过简化的配置组装以捕捉可配对内聚合物链的拉链/解链特征，热力学可通过Husimi晶格的递归特性精确推导。根据递归的部分分配函数计算单链和成对链中单体以及溶剂的概率（密度），以表征相图。发现该模型是适合DNA和RNA样聚合物的实用设置，其丰富的相图显示了DNA / RNA样区域和解链/聚合酶跃迁。发现了一个有趣的平衡点，可以通过特定的参数设置来分离DNA和RNA样区域，