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  • General Chemistry  (4)
  • Cell & Developmental Biology  (3)
  • 1975-1979  (6)
  • 1890-1899  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Collagenous and other organizations in mature annelid cuticle and epidermis (1976)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 149 (1976), S. 33-51 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The mature annelid cuticle contains orthogonally oriented collagen in a matrix capped superficially by a dense epicuticle with external corpuscles. The underlying epidermis is a simple columnar epithelium with two major cell types, mucous-secreting cells which secrete through channels in the cuticle to the exterior of the worm, and “supportive” cells which presumably produce and increase the cuticle by secreting into it.The structures of supportive cells, previously interpreted as specialized for establishing interfibrillar collagen order, are revealed by glutaraldehyde fixation as common cellular components without the qualities deemed useful to align collagen. Cell processes which penetrate and sometimes pass completely through the cuticle are not stable, not in geometric order, and lack cilia-like structure. Cilia, unlike the ubiquitous cellular processes, are highly restricted to regions of the epidermis with specialized functions. Cellular control, or other control, of collagen fibrillogenesis remains unestablished.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051490103
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  • 2
    Electronic Resource
    Electronic Resource
    Collagen deposition on a preformed grid (1976)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 149 (1976), S. 53-71 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Appearance of collagen fibrils in the cuticle was seen by electron microscopy to be preceded by fonnation of a finely filamentous matrix material. At first, the fine filaments of the matrix are unorganized. However, signs of orthogonal ordering soon appear in the most superficial portion of the cuticle, and subsequently appear more basally and closer to the underlying epidermis. Meanwhile, fibrils of different staining properties and identifiable as collagen begin to be deposited in the superficial portion of the cuticle, the same region which first showed organized fine filaments. Then, like the fine filaments before them, the collagen fibrils polymerize more basally. Collagen appears to polymerize on the preformed skeleton of fine filaments as though the fine filaments caused the collagen to assemble. Neither the polymerization nor ordering of collagen fibrils seems to require direct cellular intervention but occur first in that portion of the cuticle which is furthest away from the underlying epidermis. The fine filaments may be self ordering, extracellular macromolecules which in turn determine the polymerization of collagen fibrils.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051490104
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  • 3
    Electronic Resource
    Electronic Resource
    Two new gregarinidaContributions from the Zoölogical Laboratory of the Museum of Comparative Zoölogy at Harvard College, under the direction of E. L. Mark, No. LXXXII. (1897)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 14 (1897), S. 1-20 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1050140102
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  • 4
    Electronic Resource
    Electronic Resource
    Anwendung von SEPIL auf die Festkörper-Defektchemie von Fluoriten und die extreme anorganische Spurenanalyse (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 91 (1979), S. 765-780 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Obwohl seit vielen Jahren bekannt ist, daß die Spektren der Lanthanoid-Ionen (Ionen der Seltenerdmetalle) Aufschluß über Phänomene im Nahbereich dieser Ionen in Festkörpern geben können, wurde die Spektroskopie von Lanthanoiden nicht sehr häufig zum Studium komplexer Materialien angewendet, da die Klassifizierung der resultierenden Spektren problematisch ist. Die Einführung abstimmbarer Laser hat dieses Problem gelöst. Durch selektive Lumineszenzanregung der als Sonde dienenden Ionen (SEPIL = selectively exciting probe ion luminescence) ist es möglich, Fluoreszenz- und Anregungsspektren von Ionen zu erhalten, die in einer einzigen Art von kristallographischer Umgebung vorliegen. In diesem Aufsatz werden zwei Anwendungen der Methode besprochen. Die erste ist das Studium der Defektchemie von Fluoriten (Verbindungen mit CaF2-Gitter). Die Methode ergibt einzigartige Informationen über die Festkörperchemie, so daß viel vom unerklärten Verhalten dieser wichtigen Stoffklasse verständlich wird. Die zweite Anwendung ist die extreme Spurenanalyse. Dazu wird das Assoziat aus dem zu analysierenden Ion und dem als Sonde fungierenden Ion untersucht. In diesem Assoziat lassen sich die spezifischen Kristallfeld-Niveaus der Sonde selektiv anregen, so daß Spuren des zu analysierenden Ions mit hoher Selektivität und Empfindlichkeit nachgewiesen werden können.
    Additional Material: 25 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19790911004
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  • 5
    Electronic Resource
    Electronic Resource
    Einfluß von Verschiebungsreagentien auf NMR-Kopplungskonstanten (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 90 (1978), S. 51-52 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19780900112
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Shift Reagents on NMR Coupling Constants (1978)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 17 (1978), S. 49-50 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.197800491
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  • 7
    Electronic Resource
    Electronic Resource
    Applications of SEPIL to the Solid State Defect Chemistry of Fluorites and Ultra-trace Inorganic Analysis [New analytical methods (16)] (1979)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 18 (1979), S. 738-752 
    Details
    ISSN: 0570-0833
    Keywords: SEPIL (selectively exiting probe ion luminescence) ; Defect chemistry ; Fluorites ; Analytical methods ; Luminescence ; Solid-state reactions ; Trace analysis ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Although it has been recognized for many years that the spectra of lanthanoid ions can provide useful information about short range phenomena in the neighborhood of these inos in a solid material, lanthanoid spectroscopy has only infrequently been used for studying complex materials because of the problem of line-sorting the complex spectra that are obtained. The advent of convenient tuneable lasers has eliminated this problem. By selectively exciting probe ion luminescence (SEPIL), it is possible to obtain fluorescence and excitation spectra from a single kind of crystallographic environment. Two applications of this method are dicussed in this paper. The first application is the study of the defect chemistry of fluorite materials (compounds with CaF2 lattice). It is shown how this method can provide unique information about the solid state chemistry, thus clarifying many of the unexplained behaviors of this important class of material. The second application shows application shows how ultra-trace analysis can be carried out by causing an association between an analyte ion and a fluorecent probe ion. The unique crystal field levels of a probe ion associated with a particular analyte can be selectively excited so that traces of the ion to be analyzed can be detected with very high selectivity and with very low detection limits.
    Additional Material: 25 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.197907381
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