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  • Chemistry  (106)
  • Basement membrane  (1)
  • Bi garnets  (1)
  • Magnetism
  • 1970-1974  (84)
  • 1945-1949  (24)
  • 1
    Electronic Resource
    Electronic Resource
    Preparation and optical properties of single crystal thin films of bismuth substituted iron garnets for magneto-optic applications (1973)
    Springer
    Applied physics 2 (1973), S. 219-228 
    Details
    ISSN: 1432-0630
    Keywords: Magneto-optics ; Bi garnets ; Liquid phase epitaxy ; Crystal growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Single crystal thin films of Bi substituted iron garnets have been grown by the liquid phase epitaxy technique. The growth conditions and compositions are presented together with the segregation coefficients of Bi and Pb as a function of growth temperature. The Faraday rotation and optical absorption have been measured for wavelengths between 0.7 and 0.46 μm. The superior magneto-optic properties (Faraday rotations of up to ten times larger than that observed for Y3Fe5O12) make these epitaxial layers attractive for magneto-optic devices. The influence of Pb incorporation on the optical properties of the films is discussed. Compositions of Bi and Ga(Al) substituted Gd3Fe5O12, which exhibit a magnetic compensation temperature near room temperature and high Faraday rotation, have also been prepared. The magnetic switching behaviour as a function of temperature has been determined. It shows that these films are especially suited for thermomagnetic recording using an argon ion laser at a wavelength of 5145 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00889503
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  • 2
    Electronic Resource
    Electronic Resource
    The formation of capillary basement membranes during internal vascularization of the rat's cerebral cortex (1972)
    Springer
    Cell & tissue research 133 (1972), S. 231-248 
    Details
    ISSN: 1432-0878
    Keywords: Ontogenesis ; Capillary ; Basement membrane ; Cerebral cortex (Rat.) ; Light- and Electromicroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The vascularization of the parietal-temporal region of the cerebral hemispheres has been studied in a total of 50 rats from day 11 of gestation up to adults. The first extracerebral vessels constituting the primary perineural vascular network and the first intracerebral vessels on day 12–14 of gestation show sinusoid characteristics, i.e. irregular thickness of the endothelial wall perforated by fenestrations or small holes and showing, if at all, the beginning accumulation of basement membrane (BM) material. No paired vessels have been observed which would be expected if internal vascularization of cortical anlage starts by penetrating loops. Immature capillaries developing by sprouting (and) from the preexistent vessels begin to appear at about day 15 of gestation. The further differentiation of the terminal vascular bed and the establishing of the definitive architecture is accompanied by the maturation of cortical tissue, i.e. diminution of extracellular spaces, differentiation of perivascular, astroglial and neuronal elements including the development of synapses. The continuous process of BM-formation from the first appearance until the postnatal thickening is described by four successive stages: Stage 1. Local accumulations of fine filamentous material between endothelium and opposite perivascular surfaces of sinusoids and sprouts. Stage 2. Delicate networks of filaments attached on endothelial, pericytal and adjacent glial plasma membranes (PM) of immature capillaries, plaques of lamina densa in narrow perivascular clefts. Stage 3. A thin continuous lamina densa adapted to the PM; its filaments are arranged parallel to the cell surface. In this plane they run randomly. In the lamina rara only few filaments run to the PM mainly perpendicular: stage of immature cortical capillaries. Stage 4. Thickened lamina densa, condensed filamentous pattern; narrow zone of lamina rara: stage of mature cortical capillaries. Coincidental with the rapid thickening of BM in the 3rd–4th postnatal week the characteristics of capillary growth change: The intensive sprouting is finished and the capillary length increases nearly proportionally to tissue volume later on. It is suggested that the BM plays a role in regulating differentiation and mitotic division of the adjacent cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307145
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  • 3
    Electronic Resource
    Electronic Resource
    An electron microscopic method for studying nucleic acid-protein complexes. Visualization of RNA polymerase bound to the DNA of bacteriophages T7 and T3Dedicated to the memory of Dr. Jean-Pierre Tranzer. (1974)
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 995-1009 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Double-stranded DNA can be readily adsorbed on mica or directly on carbon coated grids from the surface of solutions containing ethidium bromide, actinomine, or propidium diiodide. The DNA molecules are unfolded, well separated, and show a length distribution similar to molecules prepared by protein monolayer techniques.Since the intercalating dyes tested do not lead to an increased apparent diameter of the nucleic acid the method is useful for the study of nucleic acid-protein complexes. As a model, the binding of E. coli RNA polymerase to phage T7 and T3 DNA was examined under different conditions. The enzyme can easily be identified and its position along the DNA molecule can be mapped.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1974.360130514
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  • 4
    Electronic Resource
    Electronic Resource
    Zellphysiologie des Stoffwechsels. Von D. Pette. Bd. 13 der Konstanzer Universitätsreden. Herausgeg. von G. Hess. Konstanzer Universitätsverlag 1970. 50 S., brosch. DM 4,80 (1970)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 4 (1970), S. 196-196 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19700040613
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  • 5
    Electronic Resource
    Electronic Resource
    Physikalische Methoden in der Chemie: UV-Photoelektronenspektroskopie (1971)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 5 (1971), S. 65-77 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19710050302
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  • 6
    Electronic Resource
    Electronic Resource
    Notiz über ein einfaches Verfahren zur Darstellung von 3,4-Bismethylencyclobuten (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3461-3462 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731061031
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  • 7
    Electronic Resource
    Electronic Resource
    [2.2]Paracyclophane durch Addition von Acetylenderivaten an 1,2,4,5-Hexatetraen (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 1891-1902 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of [2.2]Paracyclophanes by Addition of Acetylene Derivatives to 1,2,4,5-HexatetraeneThe tetrasubstituted [2.2]paracyclophanes 4a - e are formed by cycloaddition of the symmetrical acetylene derivatives 2a - e to 1,2,4,5-hexatetraene (1), and their constitution and configuration is established by spectroscopic methods, degradation and pyrolysis experiments. The tetramethyl ester 4a is reduced to the tetraalcohol 4g, and the tetracarboxylic acid 4c is converted to the bisanhydride 4f and [2.2] paracyclophanes (4h), respectively. All possible disubstituted [2.2] paracyclophanes 6 are obtained when methyl propiolate (5a) is added to. 1, whereas further symmetrical and unsymmetrical acetylene derivatives do not react with 1.
    Notes: Die tetrasubstituierten [2.2]Paracyclophane 4a - e werden durch Cycloaddition der symmetrischen Acetylenderivate 2a - e an 1,2,4,5-Hexatetraen (1) dargestellt und ihre Konstitution und Konfiguration durch spektroskopische Methoden. Abbau- und Pyrolyseversuche bewiesen. Der Tetramethylester 4a wird zum Tetraalkohol 4g reduziert und die Tetracarbonsäure 4c in das Bisanhydrid 4f bzw. [2.2] Paracyclophan (4h) übergeführt. Bei der Anlagerung von Propiolsäure-methylester (5a) an 1 werden alle isomeren disubstituierten [2.2]paracyclophanes 6 erhalten. Weitere symmetrische und unsymmetrische Acetylenderivate reagieren nicht mit 1.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070613
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  • 8
    Electronic Resource
    Electronic Resource
    Über die Konstitution des Eugenons (1948)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 31 (1948), S. 748-752 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Eugenon, ein Inhaltsstoff aus wild wachsenden Gewürznelken, besitzt die Bruttoformel C13H16O5. Seine Konstitution des 2,4, 6- Trimethoxy-benzoylacetons folgt aus Abbaureaktionen und dem Vergleich mit einem synthetischen Produkt. Das Eugenon stellt den ersten in der Natur aufgefundenen Vertreter des Benzoylacetons dar.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19480310310
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Oxydation von α-Diketonen und einigen Derivaten von solchen mit Phtalpersäure (1949)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 32 (1949), S. 1932-1933 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Oxydation von Diacetyl mit Perphtalsäure entsteht Essigsäureanhydrid, aus Dipropionyl Propionsäureanhydrid. Die beiden Verbindungen wurden zum Nachweis in Essig- bzw. Propionsäureamid übergeführt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19490320617
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  • 10
    Electronic Resource
    Electronic Resource
    Wärmealterung und Grenztemperatur von organischen Isolierstoffen (1971)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 2 (1971), S. 127-135 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Thermal aging and endurance of organic insulating materials. The knowledge of the thermal endurance of organic insulating materials is very important for the application in electrical engineering. The change of the values of the properties by thermal aging is, theoretically, described under the assumption being a linear connection to the rules of the kinetic theory of chemical reactions. By this premise it is possible to indicate functions for aging and thermal endurance, being plotted as straight lines in suitable coordinates. In this way the test results can be evaluated better than by conventional means.
    Notes: Die Kenntnis der Grenztemperatur organischer Isolierstoffe ist für deren Anwendung in der Elektrotechnik von großer Wichtigkeit. Die Änderung von Eigenschaftswerten auf Grund einer Wärmebehandlung wird theoretisch beschrieben unter der Annahme, daß ein linearer Zusammenhang mit den Gesetzen der Reaktionskinetik besteht. Unter den getroffenen Voraussetzungen können. Alterungs- und Lebensdauerfunktionen angegeben werden, die sich bei geeigenten Koordinaten als Geradendarstellen lassen. Meßergebnisse können auf diese Weise besser ausgewertet werden als nach herkömmlichen Verfahren.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19710020304
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