Dissipative Structures
Mostrando 13-17 de 17 artigos, teses e dissertações.
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13. Dissipative structures in a two-cell system: Numerical and experimental approaches
It has been shown that the coupling between the photoreduction of the oxidized form of dichloroindophenol (an artificial electron acceptor) by thylakoids and the incident light intensity can lead to the appearance of multiple steady states when the system is operated under open conditions. In the present work, a numerical study and experimental evidence are
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14. Self-organization of the fluid mosaic of charged channel proteins in membranes.
Electrically charged ion channels in a fluid membrane may form dissipative structures driven by a concentration gradient of salt. On a molecular level the effect is due to dissipative attractive forces; the channel currents induce local gradients of the membrane potential that interact with the protein charge. Self-organization by "charged channel condensati
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15. Dissipative metabolic patterns respond during neutrophil transmembrane signaling
Self-organization is a common theme in biology. One mechanism of self-organization is the creation of chemical patterns by the diffusion of chemical reactants and their nonlinear interactions. We have recently observed sustained unidirectional traveling chemical redox [NAD(P)H − NAD(P)+] waves within living polarized neutrophils. The present study sho
The National Academy of Sciences.
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16. Patterns of Spatiotemporal Organization in an Allosteric Enzyme Model
The behavior of a model for an allosteric enzyme oscillator activated by the reaction product is analyzed in the presence of diffusion. When the concentrations of the chemicals are fixed at the boundaries, dynamic dissipative structures are shown to arise in the form of propagating concentration waves. The model is applied to the phosphofructokinase reaction
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17. Apparent role of traveling metabolic waves in oxidant release by living neutrophils
Cell metabolism self-organizes into two types of dissipative structures: chemical oscillations and traveling metabolic waves. In the present study we test the hypothesis that traveling NAD(P)H waves within neutrophils are associated spatially and temporally with the release of reactive oxygen metabolites (ROMs). Using high-speed optical microscopy and taking
The National Academy of Sciences.