Seibutsu Butsuri
Online ISSN : 1347-4219
Print ISSN : 0582-4052
ISSN-L : 0582-4052
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Volume 14, Issue 1
Displaying 1-4 of 4 articles from this issue
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  • A Theory of Nerve Nets
    Shun-ichi AMARI
    1974 Volume 14 Issue 1 Pages 1-8
    Published: January 25, 1974
    Released on J-STAGE: May 25, 2009
    DOIhttps://doi.org/10.2142/biophys.14.1
    JOURNAL FREE ACCESS
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    It is important to investigate the characteristics of nerve nets from the macroscopic viewpoint, in order to elucidate the information processing of the brain composed of an enormous number of neurons. The present paper aims at establishing a mathematical theory of nerve nets mainly from the macroscopic viewpoint.
    A method of statistical neurodynamics is proposed in the beginning, ant it is applied to nets of randomly connected neurons. The method is proved to be useful not only for deriving the macrostate equations of large-scale nets and analyzing their behaviors, but also for deriving microscopic features of statetransition. Possible mechanism of association, abstraction and conceptformation is shown, which might take place in large-scale nerve nets.
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  • Quasielastic Light Scattering
    Its Application to the Study of Biological Macromolecules
    Satoru FUJIME
    1974 Volume 14 Issue 1 Pages 9-26
    Published: January 25, 1974
    Released on J-STAGE: May 25, 2009
    DOIhttps://doi.org/10.2142/biophys.14.9
    JOURNAL FREE ACCESS
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    Recent progress in laser technology makes it possible to detect the spectral broadening of light scattered from solutions of macromolecules. Since the spectral width of light from a CW gas laser, e. g., a He-Ne laser, is only a few Hz or less, we can detect a frequency shift as small as 10 Hz if we adopt a photoelectric lightmixing technique for the detection system. In this review article, a newly developed technique, quasielastic light scattering, will be presented. The theory of the spectrum of laser light scattered from solutions of macromolecules is at first reviewed. The experimental apparatus required to measure the spectrum is then described. Finally, the application of the technique to the elucidation of problems of biophysical interest is discussed.
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  • Subunit Interaction on Ligand Binding of Hemoglobin
    Yoshiki SUGITA
    1974 Volume 14 Issue 1 Pages 27-35
    Published: January 25, 1974
    Released on J-STAGE: May 25, 2009
    DOIhttps://doi.org/10.2142/biophys.14.27
    JOURNAL FREE ACCESS
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    The Preutz model for the cooperative ligand binding and the interactions between hemoglobin subunits is briefly described. Several results are presented indicating that the binding of the ligand or changes of spin states of the irons at some hemes of a tetramer alter the states of the other hemes as detected by spectrophotometry. ESR and NMR, which support the Perutz model. The importance of describing the difference in the states of deoxygenated hemes between totally deoxygenated Hb and the intermediates in ligand binding is stressed. Kinetic results suggestingsting the presence of the intermediate states and the kinetic parameters for half liganded tetramers are introduced.
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  • [title in Japanese]
    1974 Volume 14 Issue 1 Pages 36-42
    Published: January 25, 1974
    Released on J-STAGE: May 25, 2009
    DOIhttps://doi.org/10.2142/biophys.14.36
    JOURNAL FREE ACCESS
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