title: Organizing centres for three-dimensional chemical waves.
abstract: Excitable media propagate periodic waves of chemical activity. In three dimensions, they resemble scrolls rotating about axes where reactions are not periodic. These axes close in rings which may be linked and knotted, in ways limited by an exclusion principle.
mesh_terms: D000818:Animals; D002477:Cells / Q000166:cytology*; D055598:Chemical Phenomena; D002621:Chemistry; D002645:Chickens; D004023:Dictyostelium / Q000166:cytology; D008954:Models, Biological; D010507:Periodicity; D012160:Retina / Q000166:cytology; D012984:Software