•Golding, Kozlovsky, Cohen, and Ben-Jacobs propose that the velocity of the bacteria define the colony shape.
They use a death term and chemotactic
signaling in their models. [1]
•Kawasaki claims that the diffusion coefficient of the bacteria depends on their own density, the density of the nutrients, and a stochastic term to introduce frontal instability. [4]
•Kessler and Levine employ a cutoff mechanism in the growth term, which allows the development of branching patterns. [4]