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  • 1975-1979  (3)
  • 1970-1974  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    PATHOLOGICAL CONDITIONS RESULTING FROM INSTABILITIES IN PHYSIOLOGICAL CONTROL SYSTEMS (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 316 (1979), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1979.tb29471.x
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  • 2
    Digitale Medien
    Digitale Medien
    A simple model for phase locking of biological oscillators (1979)
    Springer
    Journal of mathematical biology 7 (1979), S. 339-352 
    Details
    ISSN: 1432-1416
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Mathematik
    Notizen: Summary A mathematical model is presented for phase locking of a biological oscillator to a sinusoidal stimulus. Analytical, numerical and topological considerations are used to discuss the patterns of phase locking as a function of the amplitude of the sinusoidal stimulus and the relative frequencies of the oscillator and the sinusoidal stimulus. The sorts of experimental data which are needed to make comparisons between theory and experiment are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00275153
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  • 3
    Digitale Medien
    Digitale Medien
    Periodic auto-immune hemolytic anemia: An induced dynamical disease (1979)
    Springer
    Bulletin of mathematical biology 41 (1979), S. 829-834 
    Details
    ISSN: 1522-9602
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Mathematik
    Notizen: Abstract Experimentally induced auto-immune hemolytic anemia (AIHA) in rabbits is characterized either by constant depressed erythrocyte numbers, or by oscillatory erythrocyte numbers about a depressed level (periodic auto-immune hemolytic anemia). Here the experimetallys observed characteristics of AIHA are satisfactorily accounted for by a simple model for erythropoiesis, assuming only the peripheral erythrocyte destruction rate is elevated with all other parameters normal. The onset of periodic AIHA is identified with the occurrence of a Hopf bifurcation in the model dynamics for certain values of the erythrocyte destruction rate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02462379
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  • 4
    Digitale Medien
    Digitale Medien
    Organelle formation from pinocytotic elements in neuntes of cultured sympathetic ganglia (1972)
    Springer
    Journal of neurocytology 1 (1972), S. 311-340 
    Details
    ISSN: 1573-7381
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Chick embryo sympathetic ganglia were cultured for 36 h in the presence of NGF to establish a profuse neuritic outgrowth. The intracellular distributions of labelled and unlabelled organelles were determined with respect to time in these ganglia following reincubation for different periods with ferritin or thorium dioxide and fixation and preparation for electron microscopy. The distributions were in quantitative agreement with the hypothesis that multivesicular bodies are formed from pinocytotic vacuoles through intermediate structures we have named pre-multi-vesicular bodies. Under the conditions of our experiments the entire multi-vesicular body population turns over in about 2h. We have also obtained evidence that these last structures are involved in the later formation of simple blindended tubules that we consider to be distinct from the endoplasmic reticulum. Marker was also found in a variety of dense-cored vesicles, many of which appear to form from pinocytotic vesicles. After prolonged incubation, large numbers of labelled organelles accumulated in the neuritic varicosities, which we have found to resemble closely the organelle accumulations at interrupted peripheral nerves. Thus the latter accumulations may arise in part from local formation as well as from somatofugal migration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01102938
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