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  • Articles: DFG German National Licenses  (13)
  • 1970-1974  (12)
  • 1955-1959  (1)
  • Chemistry  (12)
  • Bone  (1)
Source
  • Articles: DFG German National Licenses  (13)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 10 (1972), S. 23-30 
    ISSN: 1432-0827
    Keywords: Bone ; Microradiography ; Autoradiography ; Preparation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé La préparation de coupes fines, plano-parallèles d'os non décalcifié, d'épaisseur connue, pour la réalisation de microradiographies et d'autoradiographies quantitatives est décrite. Pour éviter que des fractures de l'os se produisent, le fragment osseux fixé doit être inclus dans un matériel approprié qui ne doit pas se rétracter. Un minimum de force doit être appliqué à l'échantillon pendant la coupe pour éviter des vibrations. La méthode décrite, utilisant une scie circulaire tournant à faible vitesse, est adéquate. Le polissage final des surfaces du specimen est réalisé sur une machine à polir modifiée. On peut préparer un grand nombre de coupes en relativement peu de temps pour des études statistiques.
    Abstract: Zusammenfassung Die Herstellung von dünnen, parallelgestellten Schnitten von unentkalktem Knochen bekannter Dicke zur quantitativen Auto- und Mikroradiographie wird beschrieben. Der Knochen hat die Tendenz, unter Druck zu brechen. Um diese Schwierigkeit zu überwinden, ist es sehr wichtig, daß die fixierte Knochenprobe genügend vom Einbettungsmaterial durchdrungen wird und daß das Einschlußmittel sich vom Knochenrand weg kontrahiert. Beim Schneiden darf nur ein minimaler Druck auf die Probe ausgeübt werden, damit der Knochen nicht zertrümmert wird. Die beschriebene Methode, bei welcher eine spezielle Einrichtung zum Auftropfen des Schmiermittels den Gebrauch einer langsam rotierenden Kreissäge ermöglichte, erwies sich als günstig. Das schließliche Polieren der Oberflächen der Proben wurde auf einer modifizierten Schleifmaschine ausgeführt. Mit dieser Methode kann eine große Anzahl von Schnitten in relativ kurzer Zeit hergestellt werden; dies ist sehr wichtig, um eine angemessene Anzahl von Proben für statistische Analysen zu erhalten.
    Notes: Abstract The preparation of thin, parallel-sided sections of undecalcified bone of known thickness for quantitative auto- and micro-radiography is described. To overcome the tendency of the bone to fracture when stressed, it is essential that the fixed sample of bone should be adequately penetrated by the embedding material and that the mounting material should not contract away from the edge of the bone. Minimum stress must be applied to the sample when cutting or the bone may be shattered. The method described, using a gravity feed to a low speed circular saw, has been found to be suitable. Final polishing of the surfaces of the specimen was carried out on a modified lapping machine. Large numbers of sections can be prepared in a relatively short time by the method and this is essential to obtain an adequate number of samples for statistical analysis.
    Type of Medium: Electronic Resource
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  • 2
    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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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    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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  • 7
    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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  • 8
    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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  • 9
    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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  • 10
    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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