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Updated: Aug 9, 2026

The Use of Chemostats in Microbial Systems Biology
Published on: October 14, 2013
Limit cycles in a chemostat model for a single species with age structure
1Department of Applied Mathematics, University of Washington, Box 352420, Seattle, WA 98195-2420, USA. dtoth@amath.washington.edu
Abstract:
We model an age-structured population feeding on an abiotic resource by combining the Gurtin-MacCamy [Math. Biosci. 43 (1979) 199] approach with a standard chemostat model. Limit cycles arise by Hopf bifurcations at low values of the chemostat dilution rate, even for simple maternity functions for which the original Gurtin-MacCamy model has no oscillatory solutions. We find the exact location in parameter space of the Hopf bifurcations for special cases of our model. The onset of cycling is largely independent of both the form of the resource uptake function and the shape of the maternity function.
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