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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Clinical and experimental medicine 144 (1967), S. 46-53 
    ISSN: 1591-9528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The effect of deep temperature applied by Cooper's instrument on the brain of rabbits has been investigated. In 190 tests the influence of reduced blood circulation by ligation of the Aa. carotis and vertebralis on form and sice of ice-balls in the brain has been examined. Deviation from the spherical form of the phenomenon mentioned above was more rarely observed than was expected. The most frequent variations were of an elliptical or flattened manner. It is assumed that a near blood vessel may influence the form of glaciation. Blood supply seems to be most essential for the degree of glaciation. Normal blood flow diminished the size of the iced solid in the brain whereas insufficient bloodsupply or no blood-supply at all caused an extension of it. The blood pressure of 33 rabbits has been raised by injection of adrenalin and noradrenalin. The size of intra-cerebral iceballs by standardiced cooling was significantly reduced by adrenalin, whereas nor-adrenalin did not change it. The reduction of the frozen area is not immediately correlated with the increased blood pressure but with the increased vascularisation.
    Notes: Zusammenfassung An 55 Hirnen lebender Kaninchen wurden in 190 Einzelversuchen Eiskörper mittels des Cooperschen Kälteaggregates gesetzt. Vorher wurden ein- und doppelseitige Ligaturen der Aa. carotides communes und Aa. vertebrales in wechselnden Kombinationen vorgenommen. Die Eiskörpergrößen bei verschiedenen Temperaturen und Vereisungszeiten wurden bei normaler und durch die Ligaturen geminderter Zirkulation gemessen und miteinander verglichen. Die Eiskörper waren nach Ligatur der Hirngefäße in dem versorgten Hirngebiet konstant größer als bei ungehinderter Zirkulation. In 80% der Versuche zeigten sie Kugelform, in 20% ellipsoide oder abgeplattete Formen. An weiteren 33 Kaninchen wurde durch Noradrenalin- und Adrenalingaben der Blutdruck gesteigert. Es ergab sich keine Beeinträchtigung des Durchmessers im Standardverfahren gesetzter intracerebraler Eiskörper durch Noradrenalin, während bei Blutdrucksteigerung nach Adrenalingabe die Kälteeffekte, gemessen an der Größe der Eiskörper im Hirngewebe, reproduzierbar gemindert waren. Diese Wirkung wird auf eine mit dem Blutdruckanstieg verbundene Durchblutungssteigerung des Gehirns zurückgeführt. Bei konstanten Abkühlungsbedingungen kann die Eiskörpergröße als ein Durchblutungsmaß angesehen werden.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 6 (1966), S. 272-277 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Whereas 2.4 is likely to be an upper limit for theDq/B-value of Cr(3)-complexes which show fluorescence the existence of a lower bound is rather unlikely. Experimental evidence suggests that the energy difference between the minima of the2 E g- and the4 T 2g-potential curves is one of the factors determining the relative intensities of phosphorescence and fluorescence.
    Abstract: Résumé Alors que 2,4 apparaît comme une limite supérieure du rapportDq/B pour les complexes fluorescents de Cr(3), l'existence d'une limite inférieure est peu probable. L'évidence expérimentale suggère que l'intensité relative de la phosphorence et de la fluorescence est déterminée par la différence d'énergie entre les minima des courbes de potentiel des états2 E g et4 T 2g .
    Notes: Zusammenfassung Während 2,4 wahrscheinlich die obere Grenze für denDq/B-Wert fluoreszierender Cr(3)Komplexe ist, gibt es für die Existenz eines unteren Grenzwerts keine Anzeichen. Experimentelle Ergebnisse legen nahe, daß das Verhältnis von Phosphoreszenz- zu Fluoreszenzemission durch die relative Höhe der Minima der2 E g- und4 T 2g-Potentialkurven bestimmt wird.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 6 (1966), S. 452-452 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 6 (1966), S. 272-277 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Whereas 2.4 is likely to be an upper limit for the Dq/B-value of Cr(3)-complexes which show fluorescence the existence of a lower bound is rather unlikely. Experimental evidence suggests that the energy difference between the minima of the 2 E g- and the 4 T 2g-potential curves is one of the factors determining the relative intensities of phosphorescence and fluorescence.
    Abstract: Résumé Alors que 2,4 apparaît comme une limite supérieure du rapport Dq/B pour les complexes fluorescents de Cr(3), l'existence d'une limite inférieure est peu probable. L'évidence expérimentale suggère que l'intensité relative de la phosphorence et de la fluorescence est déterminée par la différence d'énergie entre les minima des courbes de potentiel des états 2 E g et 4 T 2g .
    Notes: Zusammenfassung Während 2,4 wahrscheinlich die obere Grenze für den Dq/B-Wert fluoreszierender Cr(3)Komplexe ist, gibt es für die Existenz eines unteren Grenzwerts keine Anzeichen. Experimentelle Ergebnisse legen nahe, daß das Verhältnis von Phosphoreszenz- zu Fluoreszenzemission durch die relative Höhe der Minima der 2 E g- und 4 T 2g-Potentialkurven bestimmt wird.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 7 (1969), S. 1863-1882 
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(methyl methacrylate) tensile bars were prepared containing nearly spherical polytetrafluoroethylene particles in concentrations from one to a thousand particles per gauge length of the bars. Particle diameters varied from 0.0035 to 0.018 in. Exhaustive tensile tests were performed at sufficiently high strain rate to assure brittle fracture and the results analyzed statistically by the theory of extreme values as proposed by Epstein. The results suggested that the polytetrafluoroethylene particles themselves did not act as flaws, but that they intensified the stress field on natural flaws which acted as the origin of fracture. Assuming a Laplace distribution as the underlying distribution of tensile strength (not to be confused with observed distribution of tensile strengths) gave predicted fracture statistics in good agreement with experiment.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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