Before revision:  The suggested model allows adequate simulation of the transitions between A- and B-DNA forms, as well as of large deformations of long DNA molecules , for example, in binding with proteins . Small modifications of the model can provide the possibility of introducing sequence dependence, as well as of modeling base pairs openings . One can also study other, than sodium, ions as well as different solvents, and model the corresponding electrostatic effects .
After revision:  The suggested model allows adequate simulation of the transitions between A- and B-DNA forms, as well as of large deformations of long DNA molecules , for example, in binding with proteins . Small modifications of the model can provide the possibility of introducing sequence dependence, as well as of modeling base pairs openings in melting, transcription and replication. And one can also simulate the interactions of the DNA molecule with different types of ions in different kinds of solutions .