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  • Chemistry  (121)
  • Basement membrane  (1)
  • Magnetism
  • 1970-1974  (83)
  • 1940-1944  (39)
  • 1
    Electronic Resource
    Electronic Resource
    Über langkettige Sulfonamide und ihre therapeutischen Eigenschaften (1942)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 75 (1942), S. 369-378 
    Details
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19420750412
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  • 2
    Electronic Resource
    Electronic Resource
    Die Polymerisation des Isoprens durch Bleicherden; Darstellung eines aliphat. Diisoprens. (Über Polymerisationsreaktionen von Dienen, V. MitteilungIV. Mitteil.: Th. Lennartz, B. 76, 1006 [1943].) (1943)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 76 (1943), S. 1161-1165 
    Details
    ISSN: 0365-9631
    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.19430761202
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Hauchvergoldung auf RelaiskontaktenKurzfassung einer Podiumsdiskussion vom 3. 10. 1973, veranstaltet von der Fachgruppe 1.6 „Kontaktverhalten und Schalten“ an der TU-Karlsruhe (1974)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 5 (1974), S. 290-297 
    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: Gold Flashing on Relay Contacts. It is not the colour but the resistance of contacts which determines their efficiency. Since, however, it is an expensive and time-wasting procedure to measure the resistance of every contact, many costomers reject relays whose silver contacts show a brownish-black discolouration, complaining that they have been kept too long in stock.This problem was believed to have been solved by the introduction of gold-flashing as a temporary coating while the contacts are kept in stock. Now the German Post Office's Telecommunications Head Quarters (Fernmeldetechnisches Zentralamt der Deutschen Bundespost) in Darmstadt have found indications which raise some suspecions as to the damaging side-effects of gold-flashing. For this reason, a working committee of the VDE (Association of German Electrical Engineers), group 1.6„Contact behaviour and switching processes“, undertook its own investigations. The results were revealed during a platform-discussion on the 3rd October, 1973 in the Technical College at Karlsruhe and are given here in the form of edited speeches and a summary of the discussion.
    Notes: Nicht die Farbe, sondern der Kontaktwiderstand ist ein eindeutiges Maß für die Brauchbarkeit von Kontakten. Da aber die Messung des Kontaktwiderstandes zeitraubend und teuer ist, weisen viele Kunden Relais mit braun-schwarz angelaufenen Silberkontakten als „überlagert“ zurück. Seit der Einführung der Hauchvergoldung als vorübergehender Lagerschutz galt dieses Problem als gelöst. Hinweise des Fernmeldetechnischen Zentralamtes der Deutschen Bundespost in Darmstadt haben Zweifel an der Unschädlichkeit der Hauchvergoldung aufkommen lassen und einen Arbeitskreis der VDE-Fachgruppe 1.6„Kontaktverhalten und Schalten“ zu eigenen Untersuchungen veranlaßt. Die Ergebnisse wurden in einer Podiumsdiskussion am 3. 10. 1973 an der Technischen Hochschule Karlsruhe vorgetragen und werden heir als Kurzfassung der Vorträge und Zusammenfassung der Diskussion wiedergegeben.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19740050603
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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Phosphors. 53. 1,2,3,4-Tetraphenyl-cyclo-5-thia-1,2,3,4-tetraphosphanProfessor Margot Becke-Goehring zum 60. Geburtstage gewidmet (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 408 (1974), S. 225-236 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Phosphorus. 53. 1,2,3,4-Tetraphenylcyclo-5-thia-1,2,3,4-tetraphosphane1,2,3,4-Tetraphenyl-cyclo-5-thia-1,2,3,4-tetraphosphane (“tetraphenylcyclotetraphosphine-monosulphide„) 1 is obtained in very good yield and purity by the reaction of pentaphenyl-cyclopentaphosphane (2) with sulphur (4 C6H5P: 1 S). Further new methods of preparation are the comproportionation of 2 with (C6H5PS)3, and the reaction of dipotassium-triphenyl-cyclotriphosphide (4) with sulphur dichloride. The IR and 31P-NMR spectra of the title compound indicate unambiguously the heterocyclophosphane structure 1 with a five-membered P4S ring. The elevated stability of this ring system is evident from numerous other formation reactions, which are reported in addition.
    Notes: 1,2,3,4-Tetraphenyl-cyclo-5-thia-1,2,3,4-tetraphoshan (“Tetraphenyl-cyclotetraphosphin-monosulfid”) 1 wird durch Umsetzung von Pentaphenyl-cyclopentaphosphan (2) mit Schwefel (4 C6H5P:1 S) in sehr guter Ausbeute und Reinheit erhalten. Weitere neue Darstellungswege sind die Komproportionierung von 2 und (C6H5PS)3 sowie die Reaktion von Dikalium-triphenyl-cyclotriphosphid (4) mit Schwefeldichlorid. Das IR- und das 31P-NMR-Spektrum der Verbindung sind ein eindeutiges Indiz für die Heterocyclophosphan-Struktur 1 mit fünfgliedrigem P4S-Ring. Die besondere Stabilität dieses Molekelgerüstes geht aus der größeren Zahl weiterer Bildungs-Reaktionen für 1 hervor, über die außerdem berichtet wird.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744080302
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Chemie in Schmelzlösungen. IV. Darstellung von kristallinen Boraten M2+M4+(BO3)2 (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 37-40 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Borates of the compositions formulated above are prepared in crystalline form by cooling their molten solutions in the corresponding borate M2+O · xB2O3. Some properties of the compounds are reported.
    Notes: Die Borate M2+Sn(BO3)2 (M = Mg, Ca, Sr, Ba, Cd, Mn, Co), M2+Zr · (BO3)2 (M = Ca, Sr, Ba, Cd) und BaTi(BO3)2 werden durch Abkühlen einer schmelzflüssigen Lösung in einem Überschuß des jeweiligen Borates M2+O · xB2O3 in kristalliner Form dargestellt. Einige Eigenschaften der Verbindungen werden mitgeteilt.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713800107
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  • 8
    Electronic Resource
    Electronic Resource
    Zur Chemie in Schmelzlösungen. V. Darstellung kristalliner Halogenowolframate und Halogenomolybdate MeO · MeWO4 · nMeX2 bzw · MeO · MeMoO4 · nMeX2 (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 41-44 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and crystal growth of halogenotungstates and halogenomolybdates from molten salt solutions are described. Characteristic properties of this new class of compounds are communicated.
    Notes: Darstellung und Züchtung größerer Kristalle der Halogenowolframate und Halogenomolybdate MeO · MeAO4 · nMeX2 (Me = Ca, Sr, Ba; A = Mo, W; n = 1, 1,5; 2; X = Cl, Br) aus Schmelzlösungen werden beschrieben. Einige charakteristische Eigenschaften dieser neuen Klasse von Verbindungen werden angegeben.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713800108
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  • 9
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Hydrazins und seiner Derivate. XXXVI. Zur Kenntnis der Pernitride und Stickstoff-Komplexe von Barium, Strontium und Calcium (1973)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 396 (1973), S. 1-6 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Hydrazine and its Derivatives. XXXVI. On the Pernitrides and Nitrogen Complexes of Barium, Strontium, and CalciumFor further characterization of the alkaline earth pernitrides M3N4 (M = Ba, Sr, Ca) as well as the alkaline earth-nitrogen complexes, which can be obtained from them, magnetical studies were carried out. Whereas barium and calcium pernitride show paramagnetism and strontium pernitride weak diamagnetism, the nitrogen complexes are diamagnetic. The barium-nitrogen complex was treated with carbon monoxide under high pressures at different temperatures. Although no exact ligand exchange occurred, a partial addition of the CO molecule was noticed. By reaction of barium pernitride with carbon monoxide at 250°C and 450 at barium cyanide was produced in high yield.
    Notes: Zur weiteren Charakterisierung der Erdalkalimetallpernitride Me3N4 (Me = Ba, Sr, Ca) sowie der daraus darstellbaren Erdalkalimetall-Stickstoff-Komplexe wurden magnetische Untersuchungen durchgeführt. Während Barium- sowie Calciumpernitrid Paramagnetismus und Strontiumpernitrid schwachen Diamagnetismus aufwiesen, sind die Stickstoff-Komplexe diamagnetisch. Der Barium-Stickstoff-Komplex wurde unter hohen Drücken bei verschiedenen Temperaturen mit Kohlenmonoxid umgesetzt, wobei zwar kein echter Ligandenaustausch, wohl aber eine teilweise Addition der CO-Molekel beobachtet werden konnte. Die Behandlung von Bariumpernitrid mit Kohlenmonoxid bei etwa 250°C und 450 at liefert in hoher Ausbeute Bariumcyanid.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19733960102
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der Hexakis(trifluorphosphin)-Komplexe von Chrom(0), Molybdän(0) und Wolfram(0) (1973)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 397 (1973), S. 31-39 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hexakis(trifluorophosphine) Complexes of Chromium(0), Molybdenum(0), and Tungsten(0)The reaction of tris(π-allyl)chromium with PF3 at low pressure yields deep darkgreen tris(π-allyl)-trifluorophosphine chromium which is slowly converted into hexakis(trifluorophosphine) chromium: If tris(π-allyl)chromium is reacted with PF3 at high pressure, the only isolable product is Cr(PF3)6. Anhydrous molybdenum(V) and tungsten(VI) chloride react with PF3 in the presence of copper to the hexakis(trifluorophosphine) complexes of the zerovalent metals: The hexakis(trifluorophosphine) complexes are thermally very stable, crystalline, colourless solids.
    Notes: Eine ätherische Lösung von Tris(π-allyl)-chrom setzt sich unter geringem Trifluorphosphindruck zu tief dunkelgrünem Tris(π-allyl)-trifluorphosphinchrom um, das langsam zu kristallinem, farblosen Hexakis(trifluorphosphin)-chrom(0) weiterreagiert: Bei den Hochdruckumsetzungen des kristallinen Tris(π-allyl)-chrom konnte nur das Endprodukt Cr(PF3)6 isoliert werden. Wasserfreies Molybdän(V)-chlorid und Wolfram(VI)-chlorid bilden in Gegenwart von Kupfer als halogenbindendem Beimetall unter Trifluorphosphindruck die ebenfalls kristallinen, farblosen Hexakis(trifluorphosphin)-metall(0)-Komplexe: .
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19733970105
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