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5 papers · 1 filter
Cyclization of Short DNA Fragments
Pui-Man Lam, Yi Zhen
From the per unit length free energy for DNA under tension, we have calculated an effective contour length dependent persistence length for short DNA. This effective persistence le…
Extension, Torque and Supercoiling in Single, Stretched and Twisted DNA Molecules
Pui-Man Lam, Yi Zhen
We reinvestigate the model originally studied by Neukirch and Marko that describes the extension, torque and supercoiling in single, stretched and twisted DNA molecules, which cons…
The Role of Chain Entropy in an Analytic Model of Protein Binding in Single-DNA Stretching Experiments
Pui-Man Lam, Richard M. Neumann
We show that the simple analytical model proposed by Zhang and Marko (Phys. Rev. E 77, 031916 (2008)) to illustrate Maxwell relations for single-DNA experiments can be improved by…
Unzipping DNA from the condensed globule state--Effects of unraveling
Pui-Man Lam, J. C. Levy
We study theoretically the unzipping of a double stranded DNA from a condensed globule state by an external force. At constant force, we find that the double stranded DNA unzips an…
Comment on "Theory of high-force DNA stretching and overstretching"
Pui-Man Lam
Recently Storm and Nelson [1] (Phys.Rev. E67, 51906 (2003)) introduced the discrete persistent chain model which contains both features of the freely jointed chain (FJC) and the wo…