New measurements of DNA twist elasticity.

  title={New measurements of DNA twist elasticity.},
  author={Philip C. Nelson},
  journal={Biophysical journal},
  volume={74 5},
The symmetries of the DNA double helix require a new term in its linear response to stress: the coupling between twist and stretch. Recent experiments with torsionally constrained single molecules give the first direct measurement of this new material parameter. We extract its value from a recent experiment. Finally, we sketch the effect of constrained twist on entropic elasticity of DNA arising from the connection between Link, Twist, and Writhe. 

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