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  • 2000-2004
  • 1995-1999
  • 1980-1984  (3)
  • 1980  (3)
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  • 2000-2004
  • 1995-1999
  • 1980-1984  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Symmetry determination of the room-temperature form of LnNbO4 (Ln = La,Nd) by convergent-beam electron diffraction (1980)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 350-352 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Three different space groups, C2/c, C2 and Cc, have been reported for the room-temperature form of the rare-earth orthoniobates, LnNbO4 (Ln = La, Nd). They belong to different point groups: 2/m, 2 and m, respectively. By means of convergent-beam electron diffraction, the point group has been determined to be 2/m in the present study. Therefore the true space group must be C2/c.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739480000800
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Many-beam lattice images calculated at 100 kV and 1000 kV (1980)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 1033-1041 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Lattice images of high-temperature-phase vanadium sesquioxide (V2O3) were calculated within the Bloch-wave approach. At an accelerating voltage of 1000 kV the structure image can be produced while at 100 kV it cannot be obtained because of the small number of reflections available in the image formation, which demonstrates clearly an advantage of high voltages which are produced by improvement in the transfer condition of the objective lens. On the other hand, if an ideal phase-contrast lens is assumed in order to obtain the structure image at 100 kV, lattice-image calculations can be carried out with modified unit-cell size. The results show that the maximum allowable thickness to obtain the structure image varies more rapidly than in a linear manner with the required resolution. The maximum allowable thickness increases either with higher voltages (from about 20 Å at 100 kV to about 35 Å at 1000 kV) or with larger unit cells (e.g. a dilatation of 25% in unit-cell size increases the maximum thickness from about 20 to about 35 Å). However, the evolution of the image details as a function of crystal thickness is different for these two factors, due to the different dynamical interactions of electron waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739480002094
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cilia in the ciliary epithelium (1980)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 213 (1980), S. 161-167 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Cilien des pigmentierten und des unpigmentierten Ciliar-epithels in normalen Rhesusaffenaugen wurden elektronenmikroskopisch untersucht. Zusätzlich wurde die Bildung von Cilien nach Parazentese und nach Injektion von Haemoglobin in den Glaskörperraum untersucht. In allen untersuchten Augen zeigten die Mikrotubuli in den Cilien ein 9+0 Muster; stellenweise fanden sich aber auch abweichende Mikrotubuli-Muster. In behandelten Augen nahm die Zahl der Cilien sowie ihre Länge zu. Gelegentlich ragten neugebildete Cilien (im Gegensatz zur normalen Ausrichtung) innerhalb extracellulärer Taschen in den Zellkörper hinein. Die Ergebnisse lassen vermuten, daß durch eine Vielzahl (auch medikamentöser) experimenteller Stimuli die Bildung von Cilien provoziert werden kann.
    Notes: Abstract Cilia in the pigmented and nonpigmented ciliary epithelial cells were studied by electron microscopy in the normal Rhesus monkey eye. In addition cilia formation was studied following paracentesis as well as injection of hemoglobin into the vitreous cavity. In all eyes studied, cilia had a 9+0 microtubule pattern; however, some cilia had aberrant arrangement of microtubules. Cilia increased in number and showed elongation in the treated eyes, these newly-formed cilia occasionally extending towards the cell interior opposite to the normal orientation. The results suggested that the formation of cilia can be provoked by a variety of experimental stimuli either with or without drugs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00410985
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    Paper (German National Licenses)
    Fulltext
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