  We characterize the influence that external noise, with both spatial and
temporal correlations, has on the scale dependence of the reaction parameters
of a cubic autocatalytic reaction diffusion (CARD) system. Interpreting the
CARD model as a primitive reaction scheme for a living system, the results
indicate that power-law correlations in environmental fluctuations can either
decrease or increase the rates of nutrient decay and the rate of autocatalysis
(replication) on small spatial and temporal scales.
