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  • 1
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    Oscillating systems. On emerging coherence (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-12-21
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Winfree, Arthur T -- New York, N.Y. -- Science. 2002 Dec 20;298(5602):2336-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12493899" target="_blank"〉PubMed〈/a〉
    Keywords: Biological Clocks ; Circadian Rhythm ; *Electrochemistry ; *Electrodes ; Glycolysis ; Models, Theoretical ; Neurons/physiology ; Nickel ; *Periodicity ; Suprachiasmatic Nucleus/physiology ; Yeasts/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Electrical turbulence in three-dimensional heart muscle (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-11-11
    Description: Rotors or vortex action potentials with a diameter of about 1 centimeter and a rotation period of about 0.1 second occur in normal myocardium just before transition to fibrillation, a disorderly pattern of action potential propagation. Numerical models and corresponding mathematical analysis have recently suggested candidate mechanisms, all two-dimensional, for this transition from periodic electrical activity to something resembling turbulence. However, comparably recent experiments unanimously show that rotors, and the spiral waves they radiate, remain stably periodic in two-dimensional myocardium. This seeming paradox suggests a transition mediated through disorderly dynamics of the electrical vortex in three dimensions, as a "vortex filament."〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Winfree, A T -- New York, N.Y. -- Science. 1994 Nov 11;266(5187):1003-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology and Evolutionary Biology, University of Arizona, Tucson 85721.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7973648" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Atrial Function ; Heart/*physiology ; Humans ; Mathematics ; *Models, Cardiovascular ; Ventricular Fibrillation/*physiopathology ; *Ventricular Function
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
    Electronic Resource
    Electronic Resource
    Vortex Action Potentials in Normal Ventricular Muscle (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 591 (1990), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1990.tb15089.x
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  • 4
    Electronic Resource
    Electronic Resource
    Quantitative optical tomography of chemical waves and their organizing centers (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 6 (1996), S. 617-626 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Interference from topological, chemical and biological analogies led to the guess that a wide variety of homogeneous three-dimensional materials characterized by "excitability'' might support persistent particle-like "organizing centers.'' These are vortex filaments, typically rings, around which excitation fronts circulate in the uniform medium. Robust organizing centers were recently discovered numerically in several cases, motivating a search for them in nature. But if a candidate were observed there would still be no way to examine it for the expected topological intricacies. To solve this problem we designed and constructed a hybrid chemical/optical/computational instrument using the familiar principles of tomography by filtered backprojection. We demonstrate here that it can quantitatively resolve chemical vortex filaments in a new excitable medium fashioned for the purpose. The next step, not described here, is to use the light sensitivity of this medium to contrive initial conditions from which topologically exotic organizing centers would arise and possibly persist. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.166208
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  • 5
    Electronic Resource
    Electronic Resource
    Evolving perspectives during 12 years of electrical turbulence (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 8 (1998), S. 1-19 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This Focus issue describes a problem in electrical dynamics which has fascinated generations of physiologists. There are today so many views of fibrillation that only the rarest generalization can embrace all of them. Fifty-two prominent investigators collaborate here to present aspects of the problem in these eighteen articles (including this introduction) tailored for readers whose principal expertise lies elsewhere. In "The High One's Lay" (Norse Runes, ca. 800) Odin remarks, "Much too early I came to many places: the beer was not yet ready, or was already drunk..." but to this one we come at very nearly the right time in 1998. This introduction attempts to guide newcomers by noting the changed or multiple meanings of novel technical terms while sorting the key facts and ideas into an order that facilitates comparison and contrast with those of a dozen years ago. This Focus issue is authored by some of the foremost innovators of both theory and experiment in this area. By assimilating their presentations the readers of Chaos can become well poised to appreciate and evaluate the definitive evidence expected in the next few years. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.166306
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  • 6
    Electronic Resource
    Electronic Resource
    Chemical vortex dynamics in the Belousov-Zhabotinskii reaction and in the two-variable oregonator model (1989)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 740-749 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100339a047
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  • 7
    Electronic Resource
    Electronic Resource
    Crystals from dreams (1991)
    [s.l.] : Nature Publishing Group
    Nature 352 (1991), S. 568-569 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] RAISING the temperature of a solution in which many chemical reactions simultaneously transpire does more than just speeding up the conveyor belt of the chemical assembly line. Each reaction has its own temperature coefficient, so chemical balances also shift. This shift can be more dramatic if the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/352568a0
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  • 8
    Electronic Resource
    Electronic Resource
    Circadian rhythms: Benzodiazepines set the clock (1986)
    [s.l.] : Nature Publishing Group
    Nature 321 (1986), S. 114-115 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE time will come when a traveller leaving for the airport, having frantically searched for and found his ticket, will still not be ready: it will be necessary to dash to the medicine cabinet to rummage for the inevitably misplaced bottle of jet-lag pills. Elsewhere in this issue (Nature 321, 167; ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/321114a0
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  • 9
    Electronic Resource
    Electronic Resource
    The photosensitivity of a mutant circadian clock (1977)
    Springer
    Journal of comparative physiology 122 (1977), S. 87-109 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Konopka and Benzer (1971) produced a mutantDrosophila in which the circadian clock period is shortened by 20% and in which the maximum phase shift obtained from a saturating exposure of light is much increased. We examined the phase responses to lower energy exposures and found that in almost every aspect examined they are remarkably similar to those found inD. pseudoobscura, the only other fly examined in detail. In particular, theD. melanogaster mutant, unlike the wildtype, can be given an exposure of light of a critical energy at a critical phase which results in nearly complete loss of rhythmicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00611250
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  • 10
    Electronic Resource
    Electronic Resource
    Persistent tangled vortex rings in generic excitable media (1994)
    [s.l.] : Nature Publishing Group
    Nature 371 (1994), S. 233-236 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Excitable media sustain the propagation of a shock front with fixed speed and profile if, and only if, excitation is fast enough relative to recovery and large enough relative to the least triggering stimulus31. With only slight further increase in either parameter, rotors also ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/371233a0
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