[Calculation of parameters of the phenomenological theory of helix-coil transition in polypeptides based on a microscopic model].

An expression for the partition function of the model including only two parameters-U (energy of hydrogen bond) and Q (the number of conformations of the repeating unit) with Hamiltonian is obtained. This expression has the form of algebraic series with the number of members approximately N3, N being the length of the chain. The results of calculations of the temperature relationship of helicity degree are presented for different values of N. The transition width and the parameter of cooperativity are calculated.