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Additional recommended knowledge
The earliest significant reference in molecular biology is from 1971, by F.B. Fuller:
About the writhing number, mathematician W.F. Pohl says:
Contrary to intuition a topological property, the linking number, arises from the geometric properties twist and writhe according to the following relationship:
where Lk is the linking number, W is the writhe and T is the twist of the coil.
The linking number refers to the number of times that one strand wraps around the other. In DNA this property does not change and can only be modified by specialized enzymes called topoisomerases.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Superhelix". A list of authors is available in Wikipedia.|