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Science 10 July 1992:
Vol. 257. no. 5067, pp. 225 - 227
DOI: 10.1126/science.257.5067.225
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Articles

Phototaxis of Spiral Waves

Mario Markus 1, Zsuzsanna Nagy-Ungvarai 1, and Benno Hess 1

1 Max-Planck-Institut für Ernährungsphysiologie, Rheinlanddamm 201, W-4600 Dortmund, Germany

The drift of spiral waves toward regions of higher light intensity was observed experimentally in the ruthenium-catalyzed Belousov-Zhabotinsky reaction. A light gradient can thus be used to manipulate optical information in new computational systems based on photochemical media. The drift of a gradient that is rotationally invariant in space is three to four times as fast as that of a translationally invariant gradient. Simulations based on the use of a cellular automaton, which is made isotropic by a semirandom distribution of cells, are in agreement with the experimental results.

Submitted on January 15, 1992
Accepted on May 7, 1992

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Science. ISSN 0036-8075 (print), 1095-9203 (online)