Traveling Waves
Mostrando 13-24 de 34 artigos, teses e dissertações.
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13. Cell behavior in traveling wave patterns of myxobacteria
Cells in the early stages of starvation-induced fruiting body development migrate in a highly organized periodic pattern of equispaced accumulations that move as traveling waves. Two sets of waves are observed moving in opposite directions with the same wavelength and speed. To learn how the behavior of individual cells contributes to the wave pattern,
The National Academy of Sciences.
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14. SIMPLIFIED MODEL TO DEMONSTRATE THE ENERGY FLOW AND FORMATION OF TRAVELING WAVES SIMILAR TO THOSE FOUND IN THE COCHLEA*
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15. Influence of topology on bacterial social interaction
The environmental topology of complex structures is used by Escherichia coli to create traveling waves of high cell density, a prelude to quorum sensing. When cells are grown to a moderate density within a confining microenvironment, these traveling waves of cell density allow the cells to find and collapse into confining topologies, which are unstable to po
National Academy of Sciences.
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16. Signal sequence within FcγRIIA controls calcium wave propagation patterns: Apparent role in phagolysosome fusion
Calcium oscillations and traveling calcium waves have been observed in living cells, although amino acid sequences regulating wave directionality and downstream cell functions have not been reported. In this study we identify an amino acid sequence within the cytoplasmic domain of the leukocyte IgG receptor FcγRIIA that affects the amplitude of calcium spik
The National Academy of Sciences.
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17. 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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18. Waves and aggregation patterns in myxobacteria
Under starvation conditions, a population of myxobacteria aggregates to build a fruiting body whose shape is species-specific and within which the cells sporulate. Early in this process, cells often pass through a “ripple phase” characterized by traveling linear, concentric, and spiral waves. These waves are different from the waves observed during slime
National Academy of Sciences.
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19. Do cyanobacteria swim using traveling surface waves?
Bacteria that swim without the benefit of flagella might do so by generating longitudinal or transverse surface waves. For example, swimming speeds of order 25 microns/s are expected for a spherical cell propagating longitudinal waves of 0.2 micron length, 0.02 micron amplitude, and 160 microns/s speed. This problem was solved earlier by mathematicians who w
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20. Propagation of the apoptotic signal by mitochondrial waves
Generation of mitochondrial signals is believed to be important in the commitment to apoptosis, but the mechanisms coordinating the output of individual mitochondria remain elusive. We show that in cardiac myotubes exposed to apoptotic agents, Ca2+ spikes initiate depolarization of mitochondria in discrete subcellular regions, and these mitochondria initiate
Oxford University Press.
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21. Pattern formation and traveling waves in myxobacteria: Theory and modeling
Recent experiments have provided new quantitative measurements of the rippling phenomenon in fields of developing myxobacteria cells. These measurements have enabled us to develop a mathematical model for the ripple phenomenon on the basis of the biochemistry of the C-signaling system, whereby individuals signal by direct cell contact. The model quantit
The National Academy of Sciences.
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22. Averaging and renormalization for the Korteveg–deVries–Burgers equation
We consider traveling wave solutions of the Korteveg–deVries–Burgers equation and set up an analogy between the spatial averaging of these traveling waves and real-space renormalization for Hamiltonian systems. The result is an effective equation that reproduces means of the unaveraged, highly oscillatory, solution. The averaging enhances the appare
National Academy of Sciences.
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23. Velocity-curvature relationship of colliding spherical calcium waves in rat cardiac myocytes.
Colliding spherical calcium waves in enzymatically isolated rat cardiac myocytes develop new wavefronts propagating perpendicular to the original direction. When investigated by confocal laser scanning microscopy (CLSM), using the fluorescent Ca2+ indicator fluo-3 AM, "cusp"-like structures become visible that are favorably approximated by double parabolae.
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24. Traveling waves of in vitro evolving RNA.
Populations of short self-replicating RNA variants have been confined to one side of a reaction-diffusion traveling wave front propagating along thin capillary tubes containing the Q beta viral enzyme. The propagation speed is accurately measurable with a magnitude of about 1 micron/sec, and the wave persists for hundreds of generations (of duration less tha