Emergence of collective behavior in groups of excitable catalyst-loaded particles: spatiotemporal dynamical quorum sensing.
Spontaneous spatiotemporal wave activity occurs in groups of excitable particles for groups larger than a critical size. Experiments are carried out with particles loaded with the catalyst of the Belousov-Zhabotinsky reaction that are immersed in catalyst-free reaction mixture. The particles diffusively exchange activator and inhibitor species with the surrounding solution. All particles are nonoscillatory when separated from the other particles; however, target and spiral waves are exhibited in sufficiently large groups. A cellular particle model of the system also exhibits transitions from excitable steady state behavior to spatiotemporal wave activity with increasing group size.
Tinsley
Mark R
MR
Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506, USA.
Taylor
Annette F
AF
Huang
Zhaoyang
Z
Showalter
Kenneth
K
D000818:Animals; D002384:Catalysis; D004023:Dictyostelium / Q000502:physiology; D010316:Particle Size; D053038:Quorum Sensing / Q000502:physiology*; D013997:Time Factors