Conformation of Circular DNA in 2 Dimensions

Details Conformation of Circular DNA in 2 Dimensions Conformation of Circular DNA in 2 Dimensions

2008-06-03

arxiv.org/abs/0806.0514v1

Biology

Quantitative Biology

Biomolecules

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.101.148103

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 SAW value (in the present case $\nu=3/4$), and that the topology and dimensionality of the system strongly influences the cross-over between the rigid regime and the self-avoiding regime at a scale $L\approx 8 \ell_p$. Additionally, the bond correlation function scales with the molecular length $L$ as predicted. For molecular lengths $L\leq5 \ell_p$, circular DNA behaves like a stiff molecule with approximately elliptic shape.

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