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  • Articles: DFG German National Licenses  (14)
  • 1970-1974  (13)
  • 1955-1959  (1)
  • Chemistry  (12)
  • Calcium  (2)
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  • Articles: DFG German National Licenses  (14)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 8 (1971), S. 121-132 
    ISSN: 1432-0827
    Keywords: Calcium ; Skeleton ; Autoradiography ; Isotope ; Deposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Le taux de formation osseuse d'un chien adulte a été déterminé en divers endroits, en utilisant deux marqueurs à la tétracycline. Les valeurs obtenues ont été comparées avec des mesures similaires de dépôts calciques, obtenues par45Ca. Les mesures du ≪marquage diffus≫ de45Ca ont également été réalisées en utilisant l'autoradiographie quantitative. Les résultats ont été comparés avec les études similaires de Leeet coll. (J. Bone Joint Surg.47B, 157, 1965), effectuées à l'aide d'un chien nouveau-né et d'un chien adolescent. Il apparait ainsi que les études au45Ca permettent de mesurer la formation osseuse chez les chiens d'âges différents. Cependant, il est probable que le ≪marquage diffus≫ de calcium marqué chez l'Homme rend difficile la mesure du dépôt de calcium.
    Abstract: Zusammenfassung Die Geschwindigkeit der Knochenbildung bei einem ausgewachsenen Hund wurde mittels 2 Tetracyclinmarkierungen an verschiedenen Stellen des Knochens gemessen. Durch Messungen der Calciumzuwachsrate mittels45Ca-Tracer konnten die Werte beider Methoden verglichen werden. Die „diffuse Markierung” von45Ca wurde anhand von quantitativer Autoradiographie ebenfalls gemessen. Die Resultate wurden mit denjenigen ähnlicher Studien ausgewachsener Hund verwendet wurden. Es wird daraus geschlossen, daß die Knochenbildungsgeschwindigkeit von Hunden aller Altersstufen anhand von45Ca-Tracer-Studien gemessen werden kann. Es ist jedoch wahrscheinlich, daß die „diffuse Makierung” mit Tracer-Calcium beim Menschen zu einer schwierigen Interpretation der Messung der Calciumzuwachsrate führt.
    Notes: Abstract The bone formation rate of an adult dog has been found at several bone sites using two tetracycline markers. The values found have been compared with similar measurements of calcium accretion rate using45Ca as a tracer. Measurements of the “diffuse label” of45Ca were also made using quantitative autoradiography. The results have been compared with similar studies by Leeet al. (J. Bone Joint Surg.47 B, 157, 1965) using a puppy and an adolescent dog. It is concluded that45Ca tracer studies can measure the bone formation rate of dogs at any age. However, it is probable that the “diffuse label” uptake of tracer calcium in humans makes the calcium accretion rate measurement difficult to interpret.
    Type of Medium: Electronic Resource
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  • 2
    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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  • 3
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The thermal degradation of a bisphenol A-based epoxy resin (EP 274) cured with 4,4′-diaminodiphenyl methane (DDM) and with phthalic anhydride (PA) was studied using a radiochemical pyrolysis gas chromatography technique. Conclusive evidence for some of the degradation mechanisms of these resins was obtained by pyrolyzing samples containing various 14C-labelled groups and analyzing the products using this method.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 83 (1971), S. 804-805 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 83 (1971), S. 803-804 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1105-1117 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Oligo d(C-A) and oligo d(T-G) of known average lengths, prepared by a combination of chemical and enzymatic procedures, have been mixed in 0.02 M and 0.07 M Na+, and absorbance has been studied as a function of increasing temperature. The transitions have been analyzed for the temperature of maximum slope Tm, the breadth of the transition, the value of the slope at Tm, and the maximum hyperchromicity. Linear expressions have been found relating the inverse of the length in nucleotide units (n-1) of the shorter oligomer, irrespective of its identity, to Tm and also to the transition breadth. From a difference in slope between the Tm versus n-1 expressions for the two molarities, the entropy and enthalpy of melting have been calculated as a function of n-1.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 14 (1970), S. 345-354 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The thermal degradation of aromatic polyimides in nitrogen at 700°C was studied using pyrolysis gas chromatography, infrared spectroscopy, and radiochemical techniques. Degradation mechanisms were postulated to account for the breakdown products found and to explain variations in the ratio of carbon monoxide to carbon dioxide.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 5 (1971), S. 189-205 
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: A number of cements based upon polymeric systems are being utilized in both medical and dental fields. The polymethyl methacrylate rapid polymerizing monomerpolymer materials have undergone extensive development as dental materials and are used widely also for rentention of orthopedic prostheses. The cyanocrylates and the newly developed zinc polycarboxylate cements are being used for a variety of dental applications. These latter materials display adhesion to soft tissue and calcified tissue, respectively, and the investigation of adhesion to these substrates compared with the mechanical retention of the methacrylate materials is of considerable interest.The polycarboxylate cements have unusual properties including minimal tissue irritation and relatively high strength. The ability to vary their formulation and manipulative properties has permitted their trial in a variety of clinical applications including cementation of stainless steel orthodontic brackets to teeth.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 9
    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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  • 10
    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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