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  • 1
    Electronic Resource
    Electronic Resource
    Coupled map lattices as computational systems (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 2 (1992), S. 367-376 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The coupled map lattice (CML) as a mathematical model for a computer is considered. Using the theory of synchronous concurrent algorithms, it is shown that the CML is a valid new model for a parallel deterministic analog machine, but that, in principle, such a CML computer does not generate computations that cannot be reproduced by the standard mathematical models for computing on real numbers. The analysis is based on new general mathematical definitions of CMLs, and an axiomatic approach to determining which models of computation can be used to simulate CMLs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.165879
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  • 2
    Electronic Resource
    Electronic Resource
    Mercury in fish and shellfish A review (1973)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of food science & technology 8 (1973), S. 0 
    Details
    ISSN: 1365-2621
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1973.tb01685.x
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  • 3
    Electronic Resource
    Electronic Resource
    Organochlorine Pesticides in Seals and Porpoises (1967)
    [s.l.] : Nature Publishing Group
    Nature 216 (1967), S. 1274-1276 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Seals and porpoises in Scotland and Canada, far from the sites of application of pesticides, can accumulate high concentrations of residues in their blubber. These chemicals are spreading through the long food chain which ends with seals and porpoises and obviously cannot be confined to their place ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2161274a0
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  • 4
    Electronic Resource
    Electronic Resource
    Concentration of Chloride in Fresh Waters and Rain Water (1961)
    [s.l.] : Nature Publishing Group
    Nature 192 (1961), S. 961-962 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] For the Scottish lochs, which are situated near a very irregular coastline, the parameter D is estimated in a south-westerly direction (that of prevailing strong winds) to the coast exposed to open sea. Despite the necessarily imprecise measurement, it has been found that the coefficients of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/192961a0
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  • 5
    Electronic Resource
    Electronic Resource
    OCCURRENCE AND FATE OF ORGANIC AND INORGANIC CONTAMINANTS IN MARINE ANIMALS (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 298 (1977), 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.1749-6632.1977.tb19254.x
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  • 6
    Electronic Resource
    Electronic Resource
    Initiation and stability of reentry in two coupled excitable fibers (1992)
    Springer
    Bulletin of mathematical biology 54 (1992), S. 1039-1056 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Reentry in the heart is the repeated excitation of the same tissue by a single excitation wave; it is responsible for several types of cardiac arrhythmia. The simplest model which permits the phenomenon of reentry is two laterally coupled excitable fibers; in this paper we examine such a model in order to establish a basis for the understanding of the fundamental physical processes underlying the process of reentry. Two versions of the FitzHugh-Nagumo equations are used to develop complementary numerical and analytical results for the coupled fiber model. On the basis of numerical studies, regions of qualitatively different behaviour are mapped in the parameter space of excitation threshold and coupling strength between the fibers, and the effect of the rate of recovery is explored. Some of these regions are also obtained analytically, in good agreement with the numerical results. Finally, the results are discussed in the light of recent work on the role of the anisotropy of cardiac tissue in the initiation of reentrant activity in the heart.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460665
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  • 7
    Electronic Resource
    Electronic Resource
    Velocity and stability of solitary planar travelling wave solutions of intracellular [Ca]2+ (1999)
    Springer
    Bulletin of mathematical biology 61 (1999), S. 273-301 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Normal cardiac muscle contraction occurs in response to a rapid rise followed by a slower decay in intracellular calcium concentration. When cardiac muscle cells are loaded with calcium, an intracellular store releases calcium into the cytosol by the process of calcium-induced calcium release (CICR). This release contributes to the rise in intracellular calcium which in turn triggers contraction. We use two qualitative piecewise linear reaction-diffusion models of this behaviour to investigate the speed, stability and waveform of plane waves using singular perturbation techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/bulm.1998.0081
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  • 8
    Electronic Resource
    Electronic Resource
    Stochastic processes in neurophysiology: Transformation from point to continuous processes (1983)
    Springer
    Bulletin of mathematical biology 45 (1983), S. 443-465 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The spike train activity of neurones is considered as a point process, and methods of analysing and interpreting recorded spike trains are considered. The generation of a continuous process (membrane noise) from interacting point processes is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459582
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  • 9
    Electronic Resource
    Electronic Resource
    Qualitative modeling of mechanoelectrical feedback in a ventricular cell (1997)
    Springer
    Bulletin of mathematical biology 59 (1997), S. 1155-1181 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Mechanical changes in the heart muscle can influence its electrical properties through a process called mechanoelectrical feedback (MEF). This feedback can operate via changes in calcium dynamics during the cross-bridge cycle or via mechanosensitive (stretch-activated) channels. We present a four-variable ordinary differential equation (ODE) system that caricatures the electrical and mechanical activity of a ventricular cell and their mutual interactions. A three-variable excitable system with restitution properties of the FitzHugh-Nagumo type is coupled to a fourth equation which describes changes in cell length during a lightly loaded contraction. The resulting four-variable system models MEF in a cell and can be incorporated into spatially distributed models for mechanoelectric behavior during wave propagation in the cardiac tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460106
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  • 10
    Electronic Resource
    Electronic Resource
    Stream pollution by an organomercury compound (1976)
    Springer
    Bulletin of environmental contamination and toxicology 16 (1976), S. 483-485 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Conclusion A GC/MS study of residues in general can be very rewarding as shown by some of our unexpected discoveries, but due to the vast ammount of data collected, the best way to effectively use the technique for routine survey work must be with the aid of an interfaced computer complete with library search capabilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01686166
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