Consider the following model of two microbial populations competing for a single nutrient in a chemostat with delays in uptake conversion:
where , , on [-,0], , and , . After transforming the model, the authors give an analysis of a submodel, showing that the equilibrium in the interior of the plane may change its stability as a function of a delay parameter, and lead to a Hopf bifurcation. Numerical evidence is given. The work shows that in the chemostat a delay between nutrient uptake and reproduction can produce competitive coexistence.