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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 39 (1956), S. 1421-1427 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The syntheses of four analogues of oxytocine are described: one with a phenylalanyl residue replacing the isoleucyl residue, one with a leucyl residue replacing the isoleucyl residue, one with a valyl residue replacing the isoleucyl residue, and one with a glutaminyl residue replacing the asparaginyl residue.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 39 (1956), S. 1214-1218 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus der Rinde einer brasilianischen Pflanze, die nicht genau bestimmt werden konnte, liessen sich die als Calebassen-Alkaloide bekannten Verbindungen C-Xanthocurin und C-Alkaloid P isolieren. Daneben wurde in sehr kleiner Menge ein rotgelbes Alkaloid gefunden, welchem der Name Croceocurin zugeteilt werden soll. Als Hauptalkaloid enthalt die Rinde eine neue Verbindung vom Charakter eines quartären Ammoniumsalzes, die Kryptocurin genannt werden soll. Dieses neue Alkaloid wird vorläufig durch einige Eigenschaften charakterisiert und ist zurzeit in genauerer Bearbeitung.
    Additional Material: 2 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 39 (1956), S. 667-676 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Reduktion von Phenanthridin-jodmethylat init Na2S2O4 entsteht sin Hydrierungsprodukt vom Smp. 186O, welches verschieden ist von dem N-Methyl-o-dihydro-phenanthridin vom Smp. 48° das unter Benutzung von LiAIH4 als Reduktionsmittel früher erhalten wurde. Die Eigenschaften der neuen Dihydroverbindung sowie ihre Rückverwandlung in N-Methyl-phenanthridiniumderivate zeigen, dass es sich um das N,N′-Dimethyl-9,10,9′, 10′-tetrahydro-9,9′-di-phenanthridyl (IV) handelt.
    Additional Material: 5 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 20 (1956), S. 218-223 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 22 (1956), S. 49-54 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Viscosity-molecular weight relationships for polymethylsiloxanes of Me/Si from 2.0 to 1.5 have been determined in a variety of solvents. It has been found that, at Mw = 106, in going from an ideal solvent to the best solvent used, 2.0, 1.8, and 1.5 Me/Si polymers expand volumetrically by factors of 3.8, 2.0, and 1.15, respectively. This is consistent with the hypothesis that the 1.8 and 1.5 Me/Si materials are internally crosslinked to a high degree, and are probably spherical in shape. The solvent-polymer interaction parameters for the linear polymer in several solvents are calculated, and estimates of the solubility parameters of the various polysiloxanes are obtained.
    Additional Material: 1 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 22 (1956), S. 41-47 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Measurements of solution light scattering and solution viscosity have been made in ideal solvents on polymethylsiloxanes containing large percentages of crosslinking units. For the 1.5 Me/Si and 1.8 Me/Si polymers [η] = 0.326 M0.21 and [η] = 0.240 M0.28, respectively. Densities of the polymer molecules within their spheres of action have been calculated from the viscosity relationship of Flory. They are 0.10 and 0.05 g./cc. for the 1.5 and 1.8 Me/Si resins, respectively. These are to be compared with 0.007 g./cc. for a linear polydimethylsiloxane (Me/Si = 2.0). The high densities, the low viscosities, and the low viscosity exponents lead to the conclusion that these molecules are, to good approximation, spheres of constant density, a sort of micromicrogel.
    Additional Material: 1 Ill.
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  • 7
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Austauschvorgänge zwischen einer flüssigen und einer Gasphase, die bei vielen Verfahren, wie der Gaswaschung, Rektifikation usw. ausschlaggebend sind, lassen sich schwer theoretisch erfassen, da außer den geometrischen Verhältnissen und eventuellen Zeitkonstanten noch fünf dimensionslose Kennzahlen in das Problem eingehen. Um eine Grundlage zur Vorausberechnung des Verstärkungs-verhältnisses von Rektifizierböden zu schaffen, wurde durch Zeitlupenaufnahmen die Kinematik der Blasenentstehung und -bewegung ermittelt. Während die Blasengröße durch bekannte Gleichungen gut wiedergegeben wird, ist ihre Steiggeschwindigkeit größer als erwartet. Durch Messungen am System N2/O2 konnte festgestellt werden, daß während des Aufsteigens der Blase der Stoffaustausch nur durch die Verhältnisse auf der Dampfseite bestimmt ist. Die Zirkulation innerhalb der Blase bestimmt somit das Verstärkungsverhältnis. Auf Grund dieser Anschauung kann die Abhängigkeit des Verstärkungsverhältnisses von der Flüssigkeitshöhe und der durchgesetzten Gasmenge durch Gleichungen befriedigend dargestellt werden.
    Additional Material: 5 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 28 (1956), S. 644-645 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es wird eine Apparatur mit einer neuartigen Form von Reaktionsgefäßen beschrieben, die sich im wesentlichen aus laborüblichen Mitteln zusammenstellen und leicht reinigen läßt. Die Gasmenge wird volumetrisch gemessen, so daß sich die Ergebnisse einfach auswerten lassen.
    Additional Material: 2 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 2 (1956), S. 271-272 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A method, based upon the pertinent flat-plate heat transfer equation, is presented for computing the local heat transfer coefficients for a boundary layer subjected to streamwise velocity and pressure gradients. No extensive mathematical background is required as the complexity of a rigorous solution for this type of problem is avoided. The validity of the method for gases is demonstrated by comparison of the predicted coeffcients with the experimental data for two widely different problems.
    Additional Material: 2 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 2 (1956), S. 555-560 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper describes an investigation of the factors affecting the change in composition with vaporization of a binary-component spray in heated air at atmospheric pressure. The behavior of the system orthodichlorobenzene-tetrachloroethylene was studied in air ranging from 400° to 1,000°F. Initial drop diameters in the sprays were in the 20- to 400-µ range. The experimental data obtained indicated that the rate of change of spray composition during vaporization was affected only by the chamber-air temperature, the initial feed composition, and the nozzle characteristics.Equations are presented which mathematically describe the vaporization process, liquid diffusion being assumed within the drop controls. These equations have been solved by a stepwise procedure for three initial drop sizes. Results of these calculations have been added statistically according to the initial-drop-size distribution in order to predict the vaporization behavior of the spray. Details of this process of statistical combination have been summarized by Culverwell (1).The calculations agreed with the experimental data previously obtained during the first 5 in. of nozzle-to-tray travel. After 5 in. the deviation was great. Future experimental work to determine more precise values of drop-size distribution, initial drop velocity, and liquid diffusion coefficient may result in more complete agreement.
    Additional Material: 6 Ill.
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