Stability in generic mitochondrial models

Details Stability in generic mitochondrial models Stability in generic mitochondrial models

2007-06-25

arxiv.org/abs/0706.3684v1

Biology

Quantitative Biology

Quantitative Methods

22 pages, 1 figure. Submitted to Mathematical Biosciences

Scientific paper

In this paper, we use a variety of mathematical techniques to explore existence, local stability, and global stability of equilibria in abstract models of mitochondrial metabolism. The class of models constructed is defined by the biological description of the system, with minimal mathematical assumptions. The key features are an electron transport chain coupled to a process of charge translocation across a membrane. In the absence of charge translocation these models have previously been shown to behave in a very simple manner with a single, globally stable equilibrium. We show that with charge translocation the conclusion about a unique equilibrium remains true, but local and global stability do not necessarily follow. In sufficiently low dimensions - i.e. for short electron transport chains - it is possible to make claims about local and global stability of the equilibrium. On the other hand, for longer chains, these general claims are no longer valid. Some particular conditions which ensure stability of the equilibrium for chains of arbitrary length are presented.

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