A dichotomy for a class of cyclic delay systems

Details A dichotomy for a class of cyclic delay systems A dichotomy for a class of cyclic delay systems

2006-01-11

arxiv.org/abs/q-bio/0601015v1

Biology

Quantitative Biology

Molecular Networks

19 pages, two figures

Scientific paper

Two complementary analyses of a cyclic negative feedback system with delay are considered in this paper. The first analysis applies the work by Sontag, Angeli, Enciso and others regarding monotone control systems under negative feedback, and it implies the global attractiveness towards an equilibrium for arbitrary delays. The second one concerns the existence of a Hopf bifurcation on the delay parameter, and it implies the existence of nonconstant periodic solutions for special delay values. A key idea is the use of the Schwarzian derivative, and its application for the study of Michaelis-Menten nonlinearities. The positive feedback case is also addressed.

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