Inwardly Rotating Spiral Waves in a Reaction-Diffusion System

doi:10.1126/science.1064167

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Science 26 October 2001:
Vol. 294. no. 5543, pp. 835 - 837
DOI: 10.1126/science.1064167

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Inwardly Rotating Spiral Waves in a Reaction-Diffusion System

Vladimir K. Vanag, Irving R. Epstein^*

Almost 30 years have passed since the discovery of concentric (target) and spiral waves in the spatially extended Belousov-Zhabotinsky(BZ) reaction. Since then, rotating spirals and target waves havebeen observed in a variety of physical, chemical, and biologicalreaction-diffusion systems. All of these waves propagate out fromthe spiral center or pacemaker. We report observations of inwardlyrotating spirals found in the BZ system dispersed in water dropletsof a water-in-oil microemulsion. These "antispirals" were alsogenerated in computer simulations.

Department of Chemistry and Volen Center for Complex Systems, Brandeis University, Waltham, MA 02454, USA.
Department of Chemistry and Volen Center for Complex Systems, Brandeis University, Waltham, MA 02454, USA. E-mail: vanag{at}brandeis.edu, epstein{at}brandeis.edu
^* To whom correspondence should be addressed. E-mail: epstein{at}brandeis.edu

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