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The nonlinear dynamics resulting from the interplay between diffusive and buoyancy-driven Rayleigh-Taylor ͑RT͒ instabilities of autocatalytic traveling fronts are analyzed numerically for fronts ascending or descending in the gravity field and for various values of the relevant parameters, the Rayleigh numbers R a and R b of the reactant A and autocatalytic product B, respectively, and the ratio D = D B / D A of the diffusion coefficients of the two key chemical species. The interaction betweendoi:10.1063/1.3077181 pmid:19317541 fatcat:gyia6v3dizcjlj5hj5nxemwlfu