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- W2904653287 abstract "Experimental studies of protein pattern formation (both in vivo and in vitro) have stimulated new interest in the dynamics of reaction--diffusion systems. However, a comprehensive theoretical understanding of the dynamics of such highly nonlinear, spatially extended systems is still missing. Here we show how a description in phase space, which has proven invaluable in shaping our intuition about the dynamics of nonlinear ordinary differential equations, can be generalized to mass-conserving reaction--diffusion (McRD) systems. We present a comprehensive theory for two-component McRD systems, which serve as paradigmatic minimal systems that encapsulate the core principles and concepts of our framework. The key insight is that shifting local chemical equilibria --- controlled by the local total density --- give rise to concentration gradients that drive diffusive redistribution of total density. This dynamic interplay can be embedded in the phase plane of the reaction kinetics in terms of simple geometric objects: the reactive nullcline (line of chemical equilibria) and the diffusive flux-balance subspace. On this phase-space level, physical insight can be gained from geometric criteria and graphical constructions --- the effects of nonlinearities on the global dynamics are simply encoded in the curved shape of the reactive nullcline. In particular, we show that the pattern-forming 'Turing instability' in McRD systems is a mass-redistribution instability, and that the features and bifurcations of patterns can be graphically determined by a flux-balance construction on the reactive nullcline. The fundamental elements of the theory presented suggest ways of experimentally characterizing pattern-forming systems on a mesoscopic level and are generalizable to a broad class of spatially extended non-equilibrium systems, and thereby pave the way toward an overarching theoretical framework." @default.
- W2904653287 created "2018-12-22" @default.
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- W2904653287 date "2018-12-20" @default.
- W2904653287 modified "2023-09-27" @default.
- W2904653287 title "Phase-space geometry of reaction--diffusion dynamics" @default.
- W2904653287 hasPublicationYear "2018" @default.
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