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Stochastic noise interferes coherently with a model biological clock and produces specific dynamic behaviour

Beck, F. ; Blasius, B. ; Lttage, U. ; Neff, R. ; Rascher, U.

Proceedings of the Royal Society B: Biological Sciences, 2001, Vol.268(1473), pp.1307-1313 [Periódico revisado por pares]

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  • Título:
    Stochastic noise interferes coherently with a model biological clock and produces specific dynamic behaviour
  • Autor: Beck, F. ; Blasius, B. ; Lttage, U. ; Neff, R. ; Rascher, U.
  • É parte de: Proceedings of the Royal Society B: Biological Sciences, 2001, Vol.268(1473), pp.1307-1313
  • Descrição: The influence of noise is unavoidable in all living systems. Its impact on a model of a biological clock, normally running in regular oscillating modes, is examined. It is shown that in a specific system in which endogenous rhythmicity is produced by a beat oscillator acting on a feedback coupled metabolic pool system, noise can act coherently to produce unexpected dynamic behaviour, running from regular over pseudoregular to irregular timestructures. If the biological system consists of a set of identical weakly coupled cells, stochasticity may lead to phase decoupling producing irregular spatiotemporal patterns. Synchronization via phase resetting can be achieved by external shorttime temperature pulses. Explicit results are obtained for the wellstudied circadian photosynthesis oscillations in plants performing crassulacean acid metabolism. Because of the generic structure of the underlying nonlinear dynamics they can, however, be regarded as a general property of the influence of noise on nonlinear excitable systems with fixed points occuring close to limit cycles.

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