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  • Chemistry  (44)
  • 1965-1969  (20)
  • 1960-1964  (24)
  • 1905-1909
  • 1968  (20)
  • 1963  (24)
  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die tert.-Butylate (CH3)3COM (M = K, Rb, Cs) kristallisieren nach röntgenographischen Untersuchungen der Kristallpulver kubisch-primitiv mit den Gitterkonstanten a = 8.475Å (K), 8.610Å (Rb) und 8.902Å (Cs) und vier Formeleinheiten je Elementarzelle. Sie bilden tetramere Struktureinheiten dadurch, daß die Metall- und O-Atome alternierend die Ecken nur wenig verzerrter Würfel besetzen, die von den vier tert.-Butylgruppen in Richtung der verlängerten Raumdiagonalen umgeben sind. Genaue Atomabstände konnten für die K-Verbindung ermittelt werden, wogegen im Falle der Rb-Verbindung nur die Metallatome lokalisiert wurden. Nach 1H-Breitlinienresonanzuntersuchungen der K-Verbindung rotieren bei Raumtemperatur die gesamten tert.-Butylgruppen. Während diese Rotationen bei -20 bis -50° einfrieren, kommt die Bewegung der einzelnen Methylgruppen erst bei tieferen Temperaturen zum Stillstand. Die massenspektrometrische Analyse der K-Verbindung ergab, daß auch im Dampfzustand ein Tetrameres vorliegt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 101 (1968), S. 35-40 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Kristallstruktur des Lithiumtetramethylzinkats wurde röntgenographisch aus Pulveraufnahmen bestimmt. Die tetragonal innenzentrierte Elementarzelle (a = 5.314 ± 0.01 Å; c = 11.989 ± 0.02 Å) enthält 2Li2Zn(CH3)4. Die Zn-Atome sind verzerrt tetraedrisch von Methylgruppen umgeben (Zn—C-Abstand 2.07 Å). Für die Anordnung der Li-Atome im Gitter kommen zwei Strukturen in der Raumgruppe I4 bzw. I42m in Betracht, die für zwei der vier Li-Atome unterschiedliche Lagen aufweisen. Nach den ausgeführten Intensitätsberechnungen sowie aus elektrostatischen Gründen ist das Modell in der Raumgruppe I4 wahrscheinlicher.
    Additional Material: 2 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 101 (1968), S. 2947-2955 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Kristallstrukturen der Alkalihydrogenacetylide MC ≡ CH (M = Na, K, Rb) und -propinylide MC≡CCH3 (M = Na, K) wurden aus Pulverdaten röntgenographisch bestimmt. Alle Verbindungen bilden Schichtenstrukturen mit tetragonalen Elementarzellen (Raumgruppe P 4/nmm). Dabei stehen die stäbchenförmigen Acetylid- bzw. Propinylidgruppen senkrecht zu den Schichtebenen mit ihren H- bzw. CH3-Gruppen auf den Schichtaußenseiten und den Metallionen in Verlängerung der C≡C-Gruppen im Schichtinneren. Jedes Metallion ist außerdem von vier nächsten antiparallelen Acetylidgruppen umgeben und verschiebt sich mit steigender Größe des Metallions zunehmend in die Einschnürungen dieser C≡C-Gruppen.
    Additional Material: 2 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 7 (1963), S. 1691-1695 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Comparisons were made of changes in molecular weight and in tensile strength of regenerated cellulose after exposure to 40% KOH at 90°C., for varying lengths of time. In the absence of air, both parameters decreased in a fairly consistent manner. In the presence of air, an initial steeper drop was followed by an irregular up-and-down pattern. The theory is advanced that the increase in tensile strength was caused by increased crystallinity.
    Additional Material: 3 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 10 (1968), S. 617-624 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A new concept of tissue culture equipment and procedures was developed for the mass-scale growth of several types of animal tissue cells in monolayers on multiple glass surfaces. Continuous, cell lines, primary and diploid cell strains were grown in this equipment. Cells studied include primary bovine kidney, human diploid WI-38, human foreskin, and mouse CCL1 cells. Photomicrographic comparisons of cells grown by these techniques indicate they are morphologically identical to tissue culture cells grown in glass bottles or tubes. The growth of the tissue culture cells in the propagator was monitored by carbohydrate Utilization and acid production. Large-scale production of viruses and biochemicals on cells grown in the multiple-plate tissue culture propagator was accomplished. Virus titers were equal to those obtained from conventional bottle or tube cultures for several strains of influenza, parainfluenza, and respiratory syneytial viruses. High-titred mouse interferon was also produced in this system. In addition to tissue culture cell production, Eaton agent, Mycoplasma pneumoniae was grown on the multiple glass surfaces on a mass scale.
    Additional Material: 6 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 10 (1968), S. 601-615 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Various multisurface mass-scale tissue culture propagators ranging in capacity up to 200 liters have been developed at Abbott Laboratories. These patented units consist, of an enclosed vessel containing a multiplicity of separated glass plates or disks on which cells may attach and proliferate. Means for mixing and aeration of the medium are provided. Sample ports facilitate the addition of cultures and media, the withdrawal of samples, the washing of cell monolayers, and the harvesting of cells and cell products. The large cell growth surface per occupied volume, the provision for separating tissue cells from media simply and easily, and the minimization of the amount of labor required per cell growth area are some of the many advantages of the multisurface tissue propagator that are described.
    Additional Material: 12 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 75 (1963), S. 755-762 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das Geheimnis des alten chinesischen Porzellans ist die Technik, mit der man aus wenig plastischen Kaolinen Massen erhält, welche die Ausformung extrem dünnwandiger Gegenstände ermöglichen. Einlagerungsverbindungen, die beim Behandeln von Kaolinit mit faulendem Urin entstehen, bilden den Schlüssel zur Herstellung solcher Massen.
    Additional Material: 6 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 80 (1968), S. 40-40 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 80 (1968), S. 123-124 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 80 (1968), S. 277-278 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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