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  • Inorganic Chemistry  (765)
  • ASTROPHYSICS  (379)
  • Life and Medical Sciences  (370)
  • Humans
  • 2015-2019
  • 1975-1979  (1,738)
  • 1950-1954
  • 1978  (1,738)
Collection
Keywords
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  • 2015-2019
  • 1975-1979  (1,738)
  • 1950-1954
Year
  • 1
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    Temporal and spatial variations of the interplanetary dust flux (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The heliocentric radial and latitudinal distributions of both small and large meteoritic particles appear to demonstrate that these particles have largely derived from comets in short-period orbits. Asteroids are unlikely to be a major source for the dust. There appears to be a spatial density depletion near the orbit of the earth, indicating significant control by the earth over particles or source bodies that come near it. Although many short-term fluctuations of meteoritic activity are observed, the content of the overall interplanetary meteoritic complex has probably been stable to within a factor of 2 within approximately the last 10,000 yr. This conclusion, together with meteoroid impact-pit and solar-flare track data on lunar rocks, suggests that solar flare activity may have been much higher about 10,000 yr ago than the present average rate.
    Keywords: ASTROPHYSICS
    Type: Space research XVIII; Proceedings of the Open Meetings of the Working Groups on Physical Sciences; Jun 07, 1977 - Jun 18, 1977; Tel Aviv; Israel
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    Electronic Resource
    Electronic Resource
    Über TlPd3O4 und TlPt3O4 - ternäre Platinmetalloxide mit Käfigstruktur (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 443 (1978), S. 11-18 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: TlPd3O4 and TlPt3O4 - Ternary Platinum Metal Oxides with Cluster StructureThe crystal structure of the cardinal red oxide TlPd3O4, prepared by the reaction of Pdo with TlNO3 or Tl2O3 at 550°C, has been determined on powder samples by X-ray and neutron diffraction. The structure of the cubic compound (a = 959.6(2) pm; space group Fm3m; Z = 8) contains square-planar PdO4 units which are joined to a three dimensional skeleton by triply bonding oxygen atoms. The cubic and rhombicuboctahedral spaces are occupied by TlIII and TlI cations so that the compound can be formulated as a mixed valency thallium(III)-thallium(I)-oxopalladate(II). The relationship with the structure of the platinum bronzes is discussed.The analogous ternary platinum oxide TlPt3O4 (a = 966.3(2)pm) has been obtained by thermal decomposition of Tl2Pt2O7.
    Notes: Die Kristallstruktur des durch Umsetzung von Pdo mit TlNO3 bzw. Tl2O3 bei 550°C erhaltenen kardinalroten Oxides TlPd3O4 wurde durch Röntgen-und Neutronenbeugung an Pulverproben aufgeklärt. In der Struktur der kubischen Verbindung (a = 959,6(2) pm; Raumgruppe Fm3m; Z = 8) sind quadratisch planare Pdo4- Baugruppen über dreibindige O- Atome zu einem dreidimensionalen Netz verknüpft. Die würfelförmigen und rhombendodekaedrischen Hohlräume des Gerüstes sind von TlIII-bzw. TlI-Kationen besetzt, so daß die Verbindung als valenzgemischtes Thallium (III)-thallium(I)-oxopalladat(II) formuliert werden kann. Die Verwandtschaftsverhältnisse zu den Strukturen der Platinbronzen werden diskutiert.Das entsprechende Oxoplatinat TlPt3O4 (a = 966,3(2) pm) konnte durch thermische Zersetzung von Tl2Pt2O7 erhalten werden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784430102
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  • 3
    Electronic Resource
    Electronic Resource
    biuz aktuell (1978)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 8 (1978), S. 192-193 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19780080608
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  • 4
    Electronic Resource
    Electronic Resource
    Das große Buch der Meeresmuscheln: Schnecken und Muscheln der Weltmeere. Von P. Dance. Deutsche Übersetzung und Bearbeitung Rudo von Cosel. Verlag Eugen Ulmer, Stuttgart. 304 Seiten, 1520 Farbfotos und 73 Zeichnungen. Kunststoff mit Schutzumschlag (Großformat). DM 88, -  (1978)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 8 (1978), S. 127-127 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19780080413
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  • 5
    Electronic Resource
    Electronic Resource
    Allgemeine Zoologie. Begründet von A. Kühn, neubearbeitet von Prof. Dr. E. Hadorn und Prof. Dr. R. Wehner, Zürich. 19., überarbeitete und erweiterte Auflage, 1974. 553 Seiten, 285 Abbildungen. Georg Thieme Verlag, Stuttgart. Gemeinschaftsausgabe mit dem Deutschen Taschenbuch Verlag München. Format 12 × 19 cm. Flexibles Taschenbuch. DM 15,80 (1978)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 8 (1978), S. 32-32 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19780080109
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  • 6
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    The L-alpha/H-alpha ratio in solar flares, quasars, and the chromosphere (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The ratio of L-alpha to H-alpha is around unity in flares, quasars, and the solar chromosphere and prominences. The weakness of L-alpha is shown to be essentially due to photon trapping and deexcitation, but it is argued that the surprising stability of this ratio is due to the role of these lines in cooling the plasma rather than the accidental parameters used in various models of these widely different phenomena.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 222
    Format: text
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  • 7
    Electronic Resource
    Electronic Resource
    Neue 1,3,2,4-Diazadiphosphetidine (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 1180-1194 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New 1,3,2,4-DiazadiphosphetidinesThe 1,3,2,4-diazadiphosphetidines 5a-f are easily prepared by the reaction of chlorobis(dialkylamino)phosphanes with sodium bis(trimethylsilyl)amide. Further oxidation reactions by O2, S8, N3Si(CH3)3, and alkyl halides are tested in detail in the case of 5a. As shown by NMR spectroscopy, 5a-f are obtained from synthesis almost exclusively as cis isomers which on thermal treatment form a mixture of cis and trans isomers. Methoiodide adducts 9a-f show this isomerisation as well.
    Notes: Die Reaktion von Chlorbis(dialkylamino)phosphanen mit Natrium-bis(trimethylsilyl)amid eröffnet einen bequemen Weg zu den 1,3,2,4-Diazadiphosphetidinen 5a-f, deren Erst- und Zweitoxidation durch O2,S8, N3Si(CH3)3 und Alkylhalogenide am Beispiel von 5a ausführlicher untersucht wird. 5a-f fallen bei der Darstellung fast ausschließlich als cis-Isomere an, die thermische Behandlung führt  -  wie NMR-spektroskopisch gezeigt wird  -  zu einem cis-trans-Isomerengemisch. Auch die Methoiodide 9a-f zeigen cis-trans-Isomerisierung.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781110336
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  • 8
    Electronic Resource
    Electronic Resource
    1,2,7-Azadiphosphepine  -  neue Phosphor und Stickstoff enthaltende Heterocyclen (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 1655-1658 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,2,7-Azadiphosphepines  -  New Phosphorus and Nitrogen Containing Heterocycles1 reacts with 2 moles of 2 to give the bicyclic compound 3 containing the new 1,2,7-azadiphosphepine ring system. Diphosphinoamines 5 can be considered as three-membered segments of the eight-membered ring system 1. Thus the amines 5 react with 2 likewise to give monocyclic 1,2,7-azadiphosphepines 6.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781110448
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  • 9
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    Computer experiments on the effect of retrograde stars in disk galaxies (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Using large-scale N-body calculations for flat disk galaxies, we examine the effect of reversing the angular momentum for various fractions of the stars upon the global bar-forming mode. The initial conditions for these simulations are based on stationary states of two classes of models: the isochrones studied recently by Kalnajs by means of linear theory, and a model resembling the Schmidt model of our own Galaxy. In both cases, as the fraction of retrograde stars is increased, the growth of the bar-forming mode is inhibited (although not eliminated). These N-body results for the isochrones agree with the predictions of linear theory, quantitatively as well as qualitatively.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 226
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    NASA TECHNICAL REPORTS
  • 10
    Electronic Resource
    Electronic Resource
    Fine structure of the secretory and non-secretory ameloblasts in the frog. II. Fine structure of the non-secretory ameloblastThis investigation was supported in part by USPHS Research Grant DE 3724. (1978)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 158 (1978), S. 181-197 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The non-secretory ameloblasts present at the enamel-free surfaces of maxillary teeth in the frog Rana pipiens were examined by electron microscopy at different stages of tooth development. Their main fine structural features seem to reflect a transport function. During early tooth development, the non-secretory ameloblasts adjacent to odontoblasts and predentin exhibit extensive lateral surface specializations and numerous cytoplasmic vesicles. During late tooth development, the non-secretory ameloblasts adjacent to mineralizing dentin show numerous cellular junctions, well-developed intercellular channels with numerous interdigitating processes and labyrinthine configurations at their distal surfaces. An intact basal lamina is present between the non-secretory ameloblasts and the dentin surface until the dentin becomes fully mineralized. At this stage the adjacent cells no longer exhibit surface specializations.It is suggested that the non-secretory ameloblasts may participate in the mineralization of adjacent dentin at the enamel-free surfaces. This surface dentin becomes fully mineralized at a later stage of development than the underlying dentin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051580205
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