Linking Number (L)

The linking number is the total number of times two strands of a DNA helix cross each other by means of either twist or writhe; this equals the number of times the two strands are interlinked. It reflects both the winding of the native DNA helix and the presence of any supercoiling.

See also: Figure 4.24, Topoisomerases, Circular DNA and Supercoiling

INTERNET LINK: Supercoiling