(1) Modelling and Optimisation of the Dynamics of Ecosystems with MICro-organisme
(2) Laboratoire de Modélisation Mathématique et Numérique dans les Sciences de l'Ingénieur [Tunis]
(3) École Nationale des Sciences de l'Informatique [Manouba]
(4) Information – Technologies – Analyse Environnementale – Procédés Agricoles
Abstract
In this work, we focus on the mathematical analysis of a model of chemostat with enzymatic degradation of a substrate (organic matter) that can partly be under a solid form [7]. The study of this 3-step model is derived from a smaller order sub-model since some variables can be decoupled from the others. We study the existence and the stability of equilibrium points of the sub-model considering monotonic growth rates and distinct dilution rates. In the classical chemostat model with monotonic kinetics, it is well known that only one equilibrium point attracts all solutions and that bistability never occurs [8]. In the present study, although only monotonic growth rates are considered, it is shown that the considered sub-model may exhibit bistability. The study of 3-step model shows the existence at most four positive equilibrium whose one is locally asymptotically stable and according to the initial condition the two species can coexist.
Keywords
English
[INFO]Computer Science [cs]
[MATH]Mathematics [math]
French
Enzymatic degradation
Chemostat
Bistability
Hydrolysis.
Growth rate
Mathematics Subject Classification 2020
92C45 - Kinetics in biochemical problems (pharmacokinetics, enzyme kinetics, etc.)
Cited by
Source: OpenCitations
Mathematical analysis of a three-tiered food-web in the chemostat
Discrete and Continuous Dynamical Systems - B
Authors : Sarra Nouaoura, Radhouane Fekih-Salem, Nahla Abdellatif, Tewfik Sari
Journal reference : Volume 26, 2020, pp. 5601-5625
