Dynamics of DNA Bubble in Viscous Medium
  The damping effect to the DNA bubble is investigated within the Peyrard-Bishop model. In the continuum limit, the dynamics of the bubble of DNA is described by the damped nonlinear Schrodinger equation and studied by means of variational method. It is shown that the propagation of solitary wave pattern is not vanishing in a non-viscous system. Inversely, the solitary wave vanishes soon as the viscous force is introduced. 
A. Sulaiman, F. P. Zen, H. Alatas, L. T. Handoko
q-bio.BM physics.bio-ph