title: Chemical turbulence and line defects induced by gradient effects in a three-dimensional reaction-diffusion system.
abstract: We report experimental observations of chemical turbulence and line defects in a three-dimensional (3-D) Belousov-Zhabotinsky (BZ) reaction-diffusion system. Transitions from spiral waves to 3-D chemical turbulence to line defects are observed. These transitions are caused by concentration gradients across the third dimension in the 3-D reaction medium, indicating the observed line defects have a 3-D structure. The line defects come out of the 3-D turbulent state, and become smooth with the increase of the control parameter. Simulation with the two-variable Oregonator model in the 3-D system reproduces similar line defects.
authors.affiliation: Department of Physics, The Beijing-Hong Kong-Singapore Joint Center for Nonlinear and Complex Systems (PKU), and Center for Theoretical Biology, Peking University, Beijing 100871, P. R. China.
authors.forename: Chunxia
authors.initials: C
authors.lastname: Zhang
authors.forename: Huimin
authors.initials: H
authors.lastname: Liao
authors.forename: Qi
authors.initials: Q
authors.lastname: Ouyang
mesh_terms: D002384:Catalysis; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004058:Diffusion; D005293:Ferritins / Q000737:chemistry; D015233:Models, Statistical; D013464:Sulfuric Acids / Q000737:chemistry
chemical_list: D013464:Sulfuric Acids; D005293:Ferritins