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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 14 (1971), S. 38-47 
    ISSN: 1432-1106
    Keywords: Neuroglia ; Migrations ; Optic Tract ; Quantitative radio-autography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Une étude radio-autographique quantitative des migrations névrogliques dans le tractus optique a été effectuée chez le Rat, après injection de thymidine tritiée, respectivement à 2 jours et demi et 6 jours après la naissance. Les paramètres suivants ont été analysés: densité de l'ensemble des cellules névrogliques; densité et pourcentage des cellules névrogliques marquées; nombre de grains par noyau, dans les trois segments du tractus; pourcentage respectif des cellules marquées dans les trois régions contiguës. Des résultats obtenus il ressort, entre autres, que la densité névroglique atteint son maximum au 9ème jour de la vie postnatale et qu'il existe d'importantes variations topographiques de cette densité et du taux des multiplications cellulaires. Ces observations permettent de discuter les conceptions actuelles sur la cinétique de la gliose de myélinisation, ainsi que divers problèmes concernant l'origine et la migration des nouvelles cellules névrogliques. Ce travail a été effectué grâce à l'aide financière du C.E.N. de Saclay, de l'I.N.S.E.R.M. et de la F.R.M.F. Les photographies ont été réalisées par P. Sibleyras. R. Georges a mis au net le manuscrit.
    Notes: Summary Following injection of tritiated thymidine at 21/2 and 6 days respectively after birth, a quantitative radio-autographic study has been made of the neuroglia migrations in the optic tract of the rat. The following parameters have been analysed: the density of the whole lot of the neuroglia cells, the density and percentage of the labelled neuroglia cells, the number of grains per nucleus in the three segments of the tract, the respective percentage of the labelled cells in the three contiguous areas. From the results we can conclude among other things that the neuroglia density reaches its maximum on the 9th day of the postnatal life and that important topographical variations of this density and of the rate of the cellular multiplications exist. These observations permit us to discuss the existing concepts of the kinetic of the myelination gliosis, as well as the various problems concerning the origin and the migration of the new neuroglia cells.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 11-15 
    ISSN: 0749-1581
    Keywords: 13C relaxation ; Molecular reorientation ; Rotational diffusion ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Although dibromomethane is a simple molecule, little work has been directed toward the analysis of its reorien-tational motion. This is surprising, since two components of its inertia tensor are nearly degenerate and may, in principle, be treated as a quasi-symmetric top. The 13C spin-lattice relaxation times and nuclear Overhauser enhancements were measured at various temperatures in the liquid phase. Field-dependent measurements indicated the presence of the scalar relaxation mechanism. Calculated rotational diffusion constants were found to be in reasonable agreement with values predicted by the J-diffusion model of inertially controlled reorientation. The results show that scalar coupling of the second kind is an important mechanism for 13C spin-lattice relaxation in this molecule. The data further indicates that dibromomethane may indeed be exhibiting quasi-symmetric top behavior of this phase.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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