Micro-mechanical measurement of the torsional modulus of DNA.
The torsional modulus C of DNA is determined from the difference between the work of stretching a single overwound molecule and the work done in stretching one underwound by the same number of turns. The value obtained C/kBT = 86 +/- 10 nm is within the range (75 +/- 25 nm) estimated by more indirect methods.
Strick
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LPS, ENS, UMR 8550 CNRS, associé aux Universités Paris VI, France.
Bensimon
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Croquette
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D001696:Biomechanical Phenomena; D004278:DNA, Superhelical / Q000737:chemistry*; D008280:Magnetics; D008958:Models, Molecular
D004278:DNA, Superhelical