We present a phenomenological dynamical model able to describe the stretching features of a lengthvs applied forceDNA curve. As concerning the chain, the model grounds on the discrete worm-like chain model with the elastic modifications, which properly describes the elongation features at low and intermediate forces. At high forces the dynamics , developed under a double well potential with a cubic term, accounts for the narrow transition present in the DNA elongation (overstretching). An good agreement between simulation and experiment is obtained.
We present a phenomenological dynamical model able to describe the stretching features of the curve of DNA length vs applied force. As concerns the chain, the model is based on the discrete wormlike chain model with elastic modifications, which properly describes the elongation features at low and intermediate forces. The dynamics is developed under a double-well potential with a linear term, which, at high forces, accounts for the narrow transition present in the DNA elongation (overstretching). A quite good agreement between simulation and experiment is obtained.
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