doi: 10.1103/PhysRevLett.101.148103.
Epub 2008 Oct 2.
Conformation of circular DNA in two dimensions
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- PMID: 18851579
- DOI: 10.1103/PhysRevLett.101.148103
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Conformation of circular DNA in two dimensions
Phys Rev Lett.
.
Abstract
The conformation of circular DNA molecules of various lengths adsorbed in a 2D conformation on a mica surface is studied. The results confirm the conjecture that the critical exponent nu is topologically invariant and equal to the self-avoiding walk value (in the present case nu=3/4), and that the topology and dimensionality of the system strongly influence the crossover between the rigid regime and the self-avoiding regime at a scale L approximately 7l{p}. Additionally, the bond correlation function scales with the molecular length L as predicted. For molecular lengths L<or=5l{p}, circular DNA behaves like a stiff molecule with an approximately elliptic shape.
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