Rigidity of melting DNA.
The temperature dependence of DNA flexibility is studied in the presence of stretching and unzipping forces. Two classes of models are considered. In one case the origin of elasticity is entropic due to the polymeric correlations, and in the other the double-stranded DNA is taken to have an intrinsic rigidity for bending. In both cases single strands are completely flexible. The change in the elastic constant for the flexible case due to thermally generated bubbles is obtained exactly. For the case of intrinsic rigidity, the elastic constant is found to be proportional to the square root of the bubble number fluctuation.
Institute of Physics, Bhubaneswar 751005, India.
Tanmoy
T
Pal
Institute of Physics, Bhubaneswar 751005, India.|Department of Physics, Ramakrishna Mission Vivekananda University, P.O. Belur Math, Dist. Howrah, West Bengal 711202, India.
Somendra M
SM
Bhattacharjee
D001696:Biomechanical Phenomena; D004247:DNA / Q000737:chemistry*; D004548:Elasticity; D008958:Models, Molecular; D009690:Nucleic Acid Conformation; D009691:Nucleic Acid Denaturation; D013816:Thermodynamics; D044366:Transition Temperature
D004247:DNA