2015/05/28 by Lin Ren, Bowen Fan, Qingyu Gao +5
Biochemistry, Genetics and Molecular Biology · Computer Science · Neuroscience · #Chemical and Physical Studies #Circadian rhythm and melatonin #Nonlinear Dynamics and Pattern Formation
paper · doi:10.1063/1.4921693
openalex publication_date 2015/05/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
The oscillation frequency of a nonlinear reaction system acts as a key factor for interaction and superposition of spatiotemporal patterns. To control and design spatiotemporal patterns in oscillatory media, it is important to establish the dominant frequency-related mechanism and the effects of external forces and species concentrations on oscillatory frequency. In the Ru(bipy)3(2+)-catalyzed Belousov-Zhabotinsky oscillator, a nonmonotonic relationship exists between light intensity and oscillatory frequency (I-F relationship), which is composed of fast photopromotion and slow photoinhibition regions in the oscillation frequency curve. In this work, we identify the essential mechanistic step of the I-F relationship: the previously proposed photoreaction Ru(II)* + Ru(II) + BrO3(-) + 3H(+) → HBrO2 + 2Ru(III) + H2O, which has both effects of frequency-shortening and frequency-lengthening. The concentrations of species can shift the light intensity that produces the maximum frequency, which we simulate and explain with a mechanistic model. This result will benefit studies of pattern formation and biomimetic movement of oscillating polymer gels.