Soliton excitations in deoxyribonucleic acid (DNA) double helices

We present in this paper a soliton theory for the open states in deoxyribonucleic acid (DNA) and synthetic polynucleotide double helices. Kink and antikink solutions for the equation of motion of the sine-Gordon form correspond to the open states with positive and negative helicities. The energy of open form and the length of the open configuration which are theoretically estimated are in the same order with the values inferred from kinetic experimental data.