{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T06:57:39Z","timestamp":1767855459626,"version":"3.49.0"},"reference-count":31,"publisher":"World Scientific Pub Co Pte Lt","issue":"07","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Int. J. Bifurcation Chaos"],"published-print":{"date-parts":[[2011,7]]},"abstract":"<jats:p> In a subexcitable light-sensitive Belousov\u2013Zhabotinsky (BZ) chemical medium an asymmetric disturbance causes the formation of localized traveling wave-fragments. Under the right conditions these wave-fragments can conserve their shape and velocity vectors for extended time periods. The size and life span of a fragment depend on the illumination level of the medium. When two or more wave-fragments collide they annihilate or merge into a new wave-fragment. In computer simulations based on the Oregonator model, we demonstrate that the outcomes of inter-fragment collisions can be controlled by varying the illumination level applied to the medium. We interpret these wave-fragments as values of Boolean variables and design collision-based polymorphic logical gates. The gate implements operation XNOR for low illumination, and it acts as NOR gate for high illumination. As a NOR gate is a universal gate, then we are able to demonstrate that a simulated light sensitive BZ medium exhibits computational universality. <\/jats:p>","DOI":"10.1142\/s0218127411029574","type":"journal-article","created":{"date-parts":[[2011,4,12]],"date-time":"2011-04-12T06:17:49Z","timestamp":1302589069000},"page":"1977-1986","source":"Crossref","is-referenced-by-count":26,"title":["ON POLYMORPHIC LOGICAL GATES IN SUBEXCITABLE CHEMICAL MEDIUM"],"prefix":"10.1142","volume":"21","author":[{"given":"ANDREW","family":"ADAMATZKY","sequence":"first","affiliation":[{"name":"University of the West of England, Bristol, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"BEN","family":"DE LACY COSTELLO","sequence":"additional","affiliation":[{"name":"University of the West of England, Bristol, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"LARRY","family":"BULL","sequence":"additional","affiliation":[{"name":"University of the West of England, Bristol, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"219","published-online":{"date-parts":[[2011,11,20]]},"reference":[{"key":"rf1","volume-title":"Collision-Based Computing","author":"Adamatzky A.","year":"2003"},{"key":"rf2","doi-asserted-by":"publisher","DOI":"10.1016\/j.chaos.2003.12.068"},{"key":"rf3","doi-asserted-by":"publisher","DOI":"10.1016\/j.chaos.2006.03.095"},{"key":"rf6","doi-asserted-by":"publisher","DOI":"10.1117\/12.490183"},{"key":"rf7","volume-title":"Winning Ways for Your Mathematical Plays","volume":"2","author":"Berlekamp E. 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