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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 198 (1963), S. 481-481 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Dr. Pautard has directed our attention to this latter observation in relation to his own work on calcified keratins, and as a result a large number of X-ray diffrac tion patterns of keratins, taken in these laboratories over a period of years, has been re-examined for the presence of apatite ...
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 195 (1962), S. 73-73 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] From this it was thought possible that in certain cases the typical denatured p-protein ring might be found in younger specimens; in consequence an extensive survey was made of disks from all age groups. The results of this survey were based entirely on X-ray diffraction observations (using copper ...
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 196 (1962), S. 1287-1291 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WOOL and related hairs (a-keratin) show no birefringence in transverse section, and it is concluded that the preferred molecular orientation must lie in the direction of the fibre axis. In the case of feather, however, which is substantially in a ^-configuration, Astbury and Bell1 observed more ...
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 190-191 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In view of the discovery during the past few years that a wide variety of hard keratins may exist in a calcified form1"5, an examination has been made of human nail and hair for evidence of heterotopic calcification. Using as a test for calcification the presence of calcium orthophosphate spacings ...
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 195 (1962), S. 172-173 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The presence of a crystalline phase has so far been inferred from a development of opacity, generally associated with a spherulitic structure in unoriented polymer, from a visual change in mechanical properties and from an increase in polymer density, due allowance being made for any imbibed ...
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 2 (1968), S. 361-369 
    ISSN: 1432-0827
    Keywords: Calcification ; Hydroxyapatite ; Keratin ; Hair ; Electron diffraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Certaines régions du cortex des fibres de kératine contiennent une proportion relativement élevée de matériel non kératinisé. L'orientation microfibrillaire dans ces régions est biaxiale et on y trouve, en outre, des zones de matériel amorphe. Les sels calciques, et en particulier l'hydroxyleapatite, sont étudiés par diffraction électronique qui permet de les localiser et de les identifier. En outre, cette technique permet de déterminer la fréquence de cellules nonkératinisées dans la partie interne du cortex et de les comparer avec les propriétés histochimiques de cette région. Une comparison est effectuée entre la calcification de la kératine et celle intéressant le collagène et l'élastine.
    Abstract: Zusammenfassung Es wird gezeigt, daß Bereiche im Cortex von gewissen Keratinfasern einen relativ hohen Anteil an nichtkeratinösem Material enthalten. Ferner konnte nachgewiesen werden, daß die Orientierung der Mikrofibrillen in diesen Bereichen biaxialer Art ist, und daß Bezirke von amorphem Material vorhanden sind. Die Calciumsalze und insbesondere das Hydroxyapatit konnten mit Hilfe der Elektronendiffraktion lokalisiert und identifiziert werden. Diese Methode hat sich auch als wertvoll erwiesen, um die Wechselbeziehung zwischen dem Vorkommen von einigen nichtkeratinisierten Zellen im Cortexinnern und den histochemischen Eigenschaften dieser Regionen zu zeigen. Ein Vergleich wird gemacht zwischen der Umgebung der Verkalkungsstellen im Keratin mit derjenigen im Kollagen und im Elastin.
    Notes: Abstract Regions in the cortex of some keratin fibres are shown to contain a relatively high proportion of non-keratinous material. The microfibrillar orientation in these regions is shown to be biaxial in nature and, in addition, areas of amorphous material are reported. Calcium salts, in particular hydroxyapatite, have been located and identified using electron diffraction, which has also proved valuable in correlating the incidence of some non-keratinised cells in the inner part of the cortex with the histochemical properties of this region. A comparison is made between the environment of the sites of calcification in keratin with those in collagen and elastin.
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  • 7
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 1043-1049 
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The room-temperature cold-drawing behavior of acetone-crystallized polyethylene terephthalate film has been compared with that of amorphous and heat-crystallized film. X-ray diffraction photographs give good resolution in the case of the acetone-crystallized sample with evidence of molecular orientation in every case. The order of the magnitudes of the yield stresses is acetone-crystallized 〈 amorphous 〈 heat-crystallized. Heating of the drawn samples produces disorientation for the amorphous drawn film with an improved resolution of the diffraction photograph for the heat-crystallized film. It is suggested that the results are in agreement with a picture of a drawing mechanism involving molecular mobility in the amorphous regions and that acetone influences the yield stress by lowering the softening temperature.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Publication Date: 1965-07-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 9
    Publication Date: 1963-05-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 10
    Publication Date: 1962-07-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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