Transition to Quorum Sensing in an Agrobacterium Population: A Stochastic Model
Figure 2
Nullclines of the Reduced Quorum-Sensing Model at Several Extracellular Concentrations of AAI
Nullclines represent lines on which the respective variable does not change with time (e.g., d[traRd]/dt = 0 on the TraRd nullcline), and their intersections correspond to the stationary states of the model. The TraRd nullcline is shown as a solid black line and the Ai nullcline at three values of Ae—(a) 35 nM, (b) 67 nM, and (c) 142 nM—is shown in color. Positions of stable stationary states are marked by filled circles for the off network state and by filled boxes for the on state. The open circle indicates the unstable steady state of a saddle type.