Abstract
In the Y model of DNA dynamics [Phys. Lett. A 136 (1989) 413] one assumes the bases to be all equal; in this note we modify the Y model to account for the differences among bases. We use this “realistic Y model” to study significant special sequences, and obtain a selection of the speed of solitons - except the simplest, “elementary” ones - in DNA; the selected speed is unphysical, suggesting that only the elementary solitons are present in real DNA. The obtained results also apply to a purine/pyrimidine approximation for the general case. We also discuss how cooperative effects could cause the equal bases approximation to the better than the purine/pyrimidine one.
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