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linking number
This term is a specialized technical descriptor used primarily in mathematics (topology) and molecular biology. It describes a topological invariant, meaning the value remains constant unless one of the closed curves is physically broken and rejoined. In biological contexts, it is a critical measure of the supercoiling state of circular DNA molecules.
Because it represents a discrete count of windings or twists, the linking number is always expressed as an integer. It is distinct from "twist" and "writhe," which are geometric properties that can vary; the linking number is the conserved sum of these two values in a closed system.
Ý nghĩa
An integer in topology and molecular biology that describes the number of times one closed curve winds around another, or the number of times a closed ribbon twists around itself.\n\nIn the context of DNA, it is the sum of twist and writhe, representing the total number of times one strand of the double helix wraps around the other.