scholarly journals Autonomous Chemical Modulation and Unidirectional Coupling in Two Oscillatory Chemical Systems

2019 ◽  
Vol 123 (8) ◽  
pp. 1498-1504 ◽  
Author(s):  
Gábor Holló ◽  
István Lagzi
Keyword(s):  
Unidirectional Coupling ◽  
Chemical Systems ◽  
Oscillatory Chemical ◽  
Chemical Modulation

Vortex dynamics in oscillatory chemical systems

1991 ◽  
Vol 1 (4) ◽  
pp. 421-434 ◽  
Author(s):  
Xiao‐Guang Wu ◽  
Merk‐Na Chee ◽  
Raymond Kapral
Keyword(s):  
Vortex Dynamics ◽  
Chemical Systems ◽  
Oscillatory Chemical

scholarly journals Complex Pacemakers and Wave Sinks in Heterogeneous Oscillatory Chemical Systems

2002 ◽  
Vol 216 (4) ◽  
Author(s):  
Michael Stich ◽  
Alexander S. Mikhailov
Keyword(s):  
Reaction Diffusion ◽  
Frequency Shifts ◽  
Reaction Diffusion Systems ◽  
Sources And Sinks ◽  
Chemical Systems ◽  
Diffusion Systems ◽  
Wave Patterns ◽  
Oscillatory Chemical ◽  
Local Shift ◽  
Phase Slips

We investigate pattern formation in oscillatory reaction-diffusion systems where wave sources and sinks are created by a local shift of the oscillation frequency. General properties of resulting wave patterns in media with positive and negative dispersion are discussed. It is shown that phase slips in the wave patterns develop for strong frequency shifts, indicating the onset of desynchronization in the medium.

scholarly journals Is the Skin an Excitable Medium? Pattern Formation in Erythema Gyratum Repens

2005 ◽  
Vol 6 (1) ◽  
pp. 57-65 ◽  
Author(s):  
Stephen Gilmore ◽  
Kerry A. Landman
Keyword(s):  
Pattern Formation ◽  
Reaction Diffusion ◽  
Biochemical Basis ◽  
Bz Reaction ◽  
Chemical Systems ◽  
Inflammatory Dermatosis ◽  
Reaction Diffusion Model ◽  
Oscillatory Chemical ◽  
Spatio Temporal ◽  
Scaly Skin

Erythema gyratum repens (EGR) is a rare, inflammatory dermatosis of unknown aetiology. The morphology of the eruption is striking and displays rapidly evolving circinate and gyrate bands of erythematous and scaly skin. Although the aetiology of the pattern is unknown, it has previously been noted that the eruption shares morphologic features with the patterns of spatio-temporal chemical concentration profiles observed in the Belusov-Zhabotinski (BZ) reaction. Yet this morphologic correspondence has not been investigated further. Here we apply a simple non-linear reaction–diffusion model, previously used to describe the BZ reaction, as a template for pattern formation in EGR, and show how the mechanism may provide a biochemical basis for many of the dynamic and morphologic features of the rash. These results are supported by the results of a cellular automaton simulation approximating the dynamics of oscillatory chemical systems—the Hodgepodge machine—where the spatio-temporal patterns developed show astonishing similarities to the morphology of EGR.

Thermodynamics of Chemical Systems

1990 ◽  
Author(s):  
Scott Emerson Wood ◽  
Rubin Battino
Keyword(s):  
Chemical Systems

Chemically Fueled Assembly of Macrocycles Comprising Multiple Transient Bonds

2019 ◽  
Author(s):  
Mohammad Mosharraf Hossain ◽  
Joshua Atkinson ◽  
Scott Hartley
Keyword(s):  
Covalent Bond ◽  
Dicarboxylic Acids ◽  
Molecular Assembly ◽  
Chemical Systems ◽  
Complex Architectures ◽  
The Creation ◽  
Dynamic Exchange

Dissipative (nonequilibrium) assembly powered by chemical fuels has great potential for the creation of new adaptive chemical systems. However, while molecular assembly at equilibrium is routinely used to prepare complex architectures from polyfunctional monomers, species formed out of equilibrium have, to this point, been structurally very simple. In most examples the fuel simply effects the formation of a single transient covalent bond. Here, we show that chemical fuels can assemble bifunctional components into macrocycles containing multiple transient bonds. Specifically, dicarboxylic acids give aqueous dianhydride macrocycles on treatment with a carbodiimide. The macrocycle is assembled efficiently as a consequence of both fuel-dependent and -independent mechanisms: it undergoes slower decomposition, building up as the fuel recycles the components, and is a favored product of the dynamic exchange of the anhydride bonds. These results create new possibilities for generating structurally sophisticated out-of-equilibrium species.

Chemically Fueled Assembly of Macrocycles Comprising Multiple Transient Bonds

2019 ◽  
Author(s):  
Mohammad Mosharraf Hossain ◽  
Joshua Atkinson ◽  
Scott Hartley
Keyword(s):  
Covalent Bond ◽  
Dicarboxylic Acids ◽  
Molecular Assembly ◽  
Chemical Systems ◽  
Complex Architectures ◽  
The Creation ◽  
Dynamic Exchange

Dissipative (nonequilibrium) assembly powered by chemical fuels has great potential for the creation of new adaptive chemical systems. However, while molecular assembly at equilibrium is routinely used to prepare complex architectures from polyfunctional monomers, species formed out of equilibrium have, to this point, been structurally very simple. In most examples the fuel simply effects the formation of a single transient covalent bond. Here, we show that chemical fuels can assemble bifunctional components into macrocycles containing multiple transient bonds. Specifically, dicarboxylic acids give aqueous dianhydride macrocycles on treatment with a carbodiimide. The macrocycle is assembled efficiently as a consequence of both fuel-dependent and -independent mechanisms: it undergoes slower decomposition, building up as the fuel recycles the components, and is a favored product of the dynamic exchange of the anhydride bonds. These results create new possibilities for generating structurally sophisticated out-of-equilibrium species.

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