Figure 1. Representation of DNA as Random Walk.
In the simulations the DNA configuration (black solid line) is represented by a random walk on a three-dimensional cubic lattice. The random walk can be thought of as a discrete set of connected beads. The lattice constant is given by the Kuhn length (which is twice the persistence length
). With this step size the directions of two sequential steps are completely uncorrelated. In the simplest picture the random walk may intersect itself, since the diameter of DNA is much smaller than the grid size.