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  • 1970-1974  (4)
  • Analytical Chemistry and Spectroscopy  (3)
  • Oral  (1)
  • Electroconvulsive shock
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 6 (1970), S. 301-315 
    ISSN: 1432-0827
    Keywords: Calcium ; Absorption ; Radioisotopes ; Oral ; Intravenous
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Les équations dérivées pour mesurer les vitesses de déplacement du calcium au niveau de l'intestin et du sang ont été appliquées à des résultats obtanus chez 23 sujets. Chaque sujet a reçu 5 μ Ci45Ca par injection intra-veineuse et 20 μ Ci47Ca per os. Les activités spécifiques du plasma, de l'urine et des fèces ont été mesurées et l'absorption et les vitesses de déplacement endogène du calcium ont été déterminées, en utilisant les deux méthodes décrites antérieurement. Les mesures basées sur les calculs du contenu des fèces en ces deux isotopes, sont plus satisfaisantes que les calculs réalisés sur le plasma. Les mesures réaliséez chez des sujets, ayant été soumis à la chirurgie gastrique, donnent certaines informations concernant les régions d'absorption du calcium.
    Abstract: Zusammenfassung Die abgeleiteten Gleichungen zur Messung der Calciumdurchflußgeschwindigkeiten in Darm und Blut kamen zur Anwendung bei der Aufarbeitung von Daten, die für 23 Personen zusammengestellt wurden. Jede Versuchsperson erhielt 5 μC45Ca i. v. und 20 μC47Ca p. o. Die spezifischen Aktivitäten von Plasma, Urin und Faeces wurden dann gemessen und daraus die Absorption sowie die endogene Calciumdurchflußgeschwindigkeit ermittelt, wozu beide in einer früheren Publikation beschriebenen Methoden benützt wurden. Die auf den Integralberechnungen der fäkalen spezifischen Aktivitäten basierenden Messungen der beiden Tracer ergaben ein befriedigenderes Resultat als jene, die auf den spezifischen Aktivitäten des Plasmas beruhten. Die Messungen an Magen-Darm-Operierten ergaben einige Hinweise auf die Lokalisation der Calciumabsorption.
    Notes: Abstract The equations derived to measure the calcium flow rates in the gut and blood have been applied to data gathered from 23 subjects. Each subject was given 5 μCi45Ca by intravenous injection and 20 μCi47Ca orally. The specific activities of plasma, urine and faeces were then measured and the absorption and calcium endogenous flow rates found, using both methods described in a previous publication. The measurements based on the calculations of the faecal occupancies, of the two tracers were found to be more satisfactory than the calculations based on plasma occupancy. The measurements on subjects who had gastric surgery gave some information on the site of calcium absorption.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 3 (1974), S. 149-150 
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Twenty-five new measurements of Kβ/Kα X-ray intensity ratios for elements in the atomic number range 20 to 30 confirm other recent evidence that the variation with atomic number in this region is much less than previously thought, but there is still some disagreement for atomic numbers above 27. A table of recommended values is given.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: High resolution mass spectral fragmentation patterns of Amaryllidaceae alkaloids in the crinine series have been investigated as well as those of certain isotopically labeled derivatives. Attention is directed to the particular importance of employing entire high resolution mass spectra in attempting the elucidation of structural correlations in compounds which display few significant relative intensity variations in a complex fragmentation pattern.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Data on defocused metastable ions have been obtained for a series of structurally significant fragment ions in the mass spectra of the estrogenic steroid, estrone methyl ether and the alkaloid tropine. These data, in conjunction with measurements on defocused metastable ions in the mass spectra of isotopically labeled analogs and complete high resolution mass spectra provide important insights into the details of fragmentation processes, specifically: (a) an enumeration and determination of the frequent multiple origins of fragment ions in the mass spectra of such complex molecules, (b) specification of skeletal atoms lost and retained in concerted (one step) processes, and at each step of stepwise processes, leading to a particular fragment ion and (c) information on the relative contributions of concerted and stepwise processes resulting in the genesis of a given ion.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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