Unidirectional Propagation of Chemical Waves through Microgaps between Zones with Different Excitability

Suzuki, Kenji; Yoshinobu, Tatsuo; Iwasaki, Hiroshi

doi:10.1021/jp0007078

Cited by 21 publications

(18 citation statements)

References 27 publications

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“…It was observed that for a specific range of barrier widths, a frequency transformation occurs, i.e. only a certain fraction of spikes reaching the barrier is able to cross it [35][36][37]. The most stable transformation returns the signal at half of the original frequency, but the other firing numbers were also observed.…”

Section: Information Processing With Compartmentalized Excitablementioning

confidence: 99%

Chemical computing with reaction–diffusion processes

Górecki

Guzowski

Górecka

et al. 2015

Phil. Trans. R. Soc. A.

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Chemical reactions are responsible for information processing in living organisms. It is believed that the basic features of biological computing activity are reflected by a reaction-diffusion medium. We illustrate the ideas of chemical information processing considering the Belousov-Zhabotinsky (BZ) reaction and its photosensitive variant. The computational universality of information processing is demonstrated. For different methods of information coding constructions of the simplest signal processing devices are described. The function performed by a particular device is determined by the geometrical structure of oscillatory (or of excitable) and non-excitable regions of the medium. In a living organism, the brain is created as a selfgrown structure of interacting nonlinear elements and reaches its functionality as the result of learning. We discuss whether such a strategy can be adopted for generation of chemical information processing devices. Recent studies have shown that lipidcovered droplets containing solution of reagents of BZ reaction can be transported by a flowing oil. Therefore, structures of droplets can be spontaneously formed at specific non-equilibrium conditions, for example forced by flows in a microfluidic reactor. We describe how to introduce information to a droplet structure, track the information flow inside it and optimize medium evolution to achieve the maximum reliability. Applications of droplet structures for classification tasks are discussed.

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Section: Information Processing With Compartmentalized Excitablementioning

confidence: 99%

Chemical computing with reaction–diffusion processes

Górecki

Guzowski

Górecka

et al. 2015

Phil. Trans. R. Soc. A.

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“…Therefore it seems to be very difficult to make a passive stripe impenetrable for a "parallel pulse" and penetrable for a "perpendicular" one in the laboratory, even if the lithographic methods for the introduction of catalyst are used. 23,24 Plotting the isoclines of eqs 3 and 4 (without the diffusion term), one can notice that decrement of h 0 stabilizes the stationary solution of eqs 3 and 4. This results in a faster relaxation of the active medium and remarkably increases the asymmetry in the penetration depth.…”

Section: Cross Junction Of the Excitable System With The Belousov-zhamentioning

confidence: 99%

Logical Functions of a Cross Junction of Excitable Chemical Media

Sielewiesiuk

Górecki

2001

J. Phys. Chem. A

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We discuss properties of a cross junction composed of active areas, in which the Belousov-Zhabotinsky reaction proceeds, and passive stripes. The response of such a junction with respect to pulses of excitation arriving from perpendicular directions is studied. It is shown that the device works as a coincidence detector because the second pulse is stopped if it arrives earlier than a certain characteristic time after the first one. Using the Rovinsky-Zhabotinsky model, we calculate the size of the cross junction and specify its temporal characteristics. We suggest how the cross junction can work as a switch of a chemical signal.

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“…Cellular automata with square and hexagonal grids of discrete BZ processors and defined coupling distances have been implemented [199]. Unidirectional wave propagation has been observed in macro [200] and micro [193] structures. Notable are in particular the chemical wave circuits of Steinbock, Kettunen and Showalter [197].…”

Section: Excitable Chemical Mediamentioning

confidence: 99%

Molecular Information Technology

Zauner

2005

Critical Reviews in Solid State and Materials Sciences

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ABSTRACT:Molecular materials are endowed with unique properties of unrivaled potential for high density integration of computing systems. Present applications of molecules range from organic semiconductor materials for low-cost circuits to genetically modified proteins for commercial imaging equipment. To fully realize the potential of molecules in computation, information processing concepts that relinquish narrow prescriptive control over elementary structures and functions are needed, and self-organizing architectures have to be developed. Investigations into qualitatively new concepts of information processing are underway in the areas of reaction-diffusion computing, self-assembly computing, and conformation-based computing. Molecular computing is best considered not as competitor for conventional computing, but as an opportunity for new applications. Microrobotics and bioimmersive computing are among the domains likely to benefit from advances in molecular computing. Progress will depend on both novel computing concepts and innovations in materials. This article reviews current directions in the use of bulk and single molecules for information processing. KEY WORDS:polymer electronics, molecular switches, self-assembly computing, conformation-based computation, self-organizing materials, bioimmersive computing

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Unidirectional Propagation of Chemical Waves through Microgaps between Zones with Different Excitability

Cited by 21 publications

References 27 publications

Chemical computing with reaction–diffusion processes

Chemical computing with reaction–diffusion processes

Logical Functions of a Cross Junction of Excitable Chemical Media

Molecular Information Technology

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