Noise synchronization and Chemical Oscillators in BZ reactions

In the present subjects we have found quite new phenomena in Belousov-Zhabotinsky (BZ) reaction which is a typical oscillatory chemical reaction system. The following facts are done and discovered.---- The entrainment dynamics of two chemical-oscillators in an excitable medium separated by some distance d was experimentally studied in the light-sensitive BZ reaction under application of external noise by light. Two chemical-oscillators were always spontaneously synchronized at sufficiently small d and small frequency difference in the absence of external light. Two BZ oscillators, which were set at insufficient distance to entrain each other for free external force, were synchronized by application of noise of the external light. Increasing the noise intensity the entrainment area in a frequency plane increased and showed a maximum at a certain noise intensity, that is, an optimum noise intensity existed. We named this the noise-synchronaization phenomenon. The computer simulation using the Amemiya model with noise term for light sensitive BZ reaction was tried, but the present noise-induced entraiment phenomenon experimentally observed was not been explained by the model.



　　　　　Reference

　　　1)O. Inomoto, K. Abe, T. Amemiya, T. Yamaguchi, S. Kai, Phys. Rev. E, Vol.61, No.5, pp.5326-9 (2000)
　　　2)K.Fujii, D. Hayashi, S. Kai, O. Inomoto, FORMA Jpn., Vol.15, pp.219-25(2000)
　　　　(Noise-induced entrainment between two coupled chemical oscillators in Belousov-Zhabotinsky reactions)
　　　3)O. Inomoto, T. Ohya, S. Kai, FORMA Jpn., Vol.15, pp.213-8(2000).
　　　4)O.Inomoto, S.Kai, T.Ariyoshi, S.Inenaga, Int.J.Bif.Chaos, 7(1997)989.




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