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  • Chemistry  (37)
  • Polymer and Materials Science  (6)
  • Magnetism
  • Ultrastructure
  • 1975-1979  (9)
  • 1960-1964
  • 1950-1954  (28)
  • 1978  (9)
  • 1950  (28)
Collection
Keywords
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Years
  • 1975-1979  (9)
  • 1960-1964
  • 1950-1954  (28)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Free radicals in colloidal systems: Formation and decay of radicals in the tensides α-hexadecyl-ω-hydroxypoly(oxyethylene) and α-tetradecyl-ω-(sodium sulfonato)tri(oxyethylene) (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 2279-2295 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Organic radicals were produced in the tensides C16H33(OCH2CH2)21OH and C14H29(OCH2CH2)3-SO3Na in aqueous solutions using a short pulse of high energy electrons. The radicals were formed by OH attack on the (OCH2CH2)x-parts of the tensides. The decay of the 250nm absorption of the radicals was recorded at different initial radical concentrations and tenside concentrations. Several radicals could be produced in one micelle. Radicals formed in the same micelle decay within microseconds or faster. The half life time τ1 in a micelle carrying two radicals is 2,0·10-6 s for C16H33(OCH2CH2)21 OH and less than 6·10-7 s for C14H29(OCH2CH2)3SO3Na. A model for intramicellar radical-radical reactions is proposed according to which the rate is faster in tensides of high critical micelle concentration. Single radicals in micelles of C16H33(OCH2CH2)21OH can deactivate each other without leaving the micelles. This intermicellar reaction is discussed in terms of the rate of diffusion-controlled micelle-micelle encounters, an encounter time of 7·10-8s, and the above time τ1 for intramicellar reaction. The observed rate constant 2k of intermicellar reaction is 3,5·106 mol-1·l·s-1. At low tenside concentrations, the bimolecular rate constant increases since more single tenside radicals are present in solution. They react rapidly (ca. 108 mol-1·l·s-1) with radicals in micelles. Single radicals in C14H33(OCH2CH2)3-SO3Na micelles cannot directly react with each other because of the Coulombic repulsion between two anionic micelles. Reaction occurs after the exit of a tenside radical from its micelle, the rate of which depends on the micellar equilibrium Mn⇄Mn-1+M (M: tenside molecule; n: agglomeration number of micelle). A single radical in solution reacts with a single radical in a micelle with 2k = 1,0·108 mol-1·l·s-1 and with another single radical in solution with 4,0·107 mol-1·l·s-1.γ-Irradiation of both tensides in aqueous solution leads to slight increases in viscosity, followed by turbidity beyond the “gel dose” and phase separation. These effects are explained in terms of crosslinking of tenside molecules. Formation of a large network requires bridges between all participating tenside molecules (not only bridges between micelles).
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790915
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  • 2
    Electronic Resource
    Electronic Resource
    Beitrag zur Kenntnis des Polypeptidteils von Mutterkornalkaloiden (Spaltung der Mutterkornalkaloide mit Hydrazin). 16. Mitteilung über Mutterkornalkaloide (1950)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 33 (1950), S. 57-67 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird die Spaltung der Mutterkornalkaloide vom Polypetid-Typus mit Hydrazin beschrieben. Neben kleineren Spaltstücken wird die vollständige Peptidseitenkette als dreigliedriges saures Spaltstück erhalten, wobei das bei der totalen Hydrolyse mit Säuren und Alkalien als Ketosäure auftretende Glied nun in reduzierter Form erhalten wird. Aus Dihydro-ergotamin isolierte man Propionyl-L-phenyl-alanyl-L-prolin und aus den anderen Alkaloiden die entsprechend aufgebauten Peptidsäuren, deren Konstitution durch Synthese bewiesen werden konnte.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19500330113
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  • 3
    Electronic Resource
    Electronic Resource
    Peptide der isomeren Lysergsäuren und Dihydro-lysergsäuren. 18. Mitteilung über Mutterkornalkaloide (1950)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 33 (1950), S. 108-116 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Als Modellversuche für die Partialsynthese der natürlichen Mutterkornalkaloide vom Peptidtypus und zum Studium des Zusammenhanges zwischen Struktur der Peptidseitenkette und pharmakologischer Wirkung wurde eine grössere Anzahl von Peptiden der isomeren Lysergsäuren und Dihydro-lysergsäuren hergestellt, analysiert und charakterisiert.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19500330119
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  • 4
    Electronic Resource
    Electronic Resource
    Recherches dans la série des cyclitols XI. Sur l'identité du viburnitol de Viburnum tinus L. avec le l-quercitol de Gymnema sylvestre Br. (1950)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 33 (1950), S. 343-349 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Le viburnitol extrait de Viburnum tinus L. est identique au l-quercitol de Gymnema sylvestre Br. A l'état dûment purifié il ne peut remplacer le méso-inositol comme facteur de croissance pour Eremothecium Ashbyii et pour le mutant “inositolless” de Neurospora crassa. Les composés phospho-organiques acido-solubles des fruits de Viburnum tinus consistent essentiellement en esters inosito-phosphoriques.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19500330217
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  • 5
    Electronic Resource
    Electronic Resource
    Über die Konstitution des Eleutherins. (Inhaltsstoffe aus Eleutherine bulbosa (Mill.) Urb. III) (1950)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 33 (1950), S. 1751-1770 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus den Knollen von Eleutherine bulbosa wurde ein bisher unbekanntes, rechtsdrehendes Naphtochinon, Eleutherin (I), isoliert und in seiner Konstitution aufgeklärt. I enthält einen Dimethylisopyranring; es konnte unter Ringöffnung über das furanoide Reduktionsprodukt XVIII in das gelbe, optisch inaktive ψ-Eleutherin (XXIII) umgewandelt werden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19500330644
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  • 6
    Electronic Resource
    Electronic Resource
    The interrelationship of structure and retetion of polyhalogenated aromatics in adsorption chromatography (1978)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 1 (1978), S. 97-97 
    Details
    ISSN: 0935-6304
    Keywords: Liquid Chromatography ; Structure and relation of polyhalogenated aromatics ; discussed ; Silica gel/aluminium oxide compared ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240010207
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  • 7
    Electronic Resource
    Electronic Resource
    Form und Mechanismen von Rissen und Brüchen unter gleichzeitiger korrosiver und dynamischer Beanspruchung mit unterschiedlichen Frequenzen (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 406-413 
    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: Form and Mechanisms of Cracks and Fractures Caused by Simultaneous Corrosive and Dynamic Stress under Various FrequenciesDistinction of crack nucleation and crack propagation under variable frequencies and electrolytic corrosion. Relationship between crack nucleation and frequency due to differing sliding mechanisms. Crack propagation under decreasing frequencies causes transition from corrosion fatigue to cyclic stress corrosion cracking and finally stress corrosion cracking can be observed. Coordination of that transition with the increasing influence of the KISCC-value as determinant of the crack propagation.The influence of frequency on high temperature materals in hot gas atmosphere is mainly determined by creep mechanisms during top-load phase and the gas-metal-reactions. Accordingly the life time increases with growing load frequency.
    Notes: Anrißphase und Phase des Rißfortschritts bei der Betrachtung der Frequenzabhängigkeit unter elektrolytischer Korrosion. Abhängigkeit der Anrißphase von der Frequenz infolge unterschiedlicher Gleitmechanismen. Beim Rißfortschritt erfolgt mit sinkender Frequenz Übergang von Schwingungsrißkorrosion zu zyklischer Spannungsrißkorrosion und schließlich zu Spannungsrißkorrosion. Zuordnung dieses Übergangs zum zunehmenden Einfluß des KISCC-Wertes als Bestimmungsgröße für den Bruchvorgang.Frequenzabhängigkeit bei Hochtemperaturwerkstoffen in Heißgasatmosphäre im wesentlichen bestimmt durch Kriechvorgänge bei Einwirkung der Oberlast und zeitabhängige Gas-Metall-Reaktionen. Entsprechend verlängern sich die Standzeiten mit zunehmender Belastungsfrequenz.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780091108
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  • 8
    Electronic Resource
    Electronic Resource
    Chemische Gesellschaft Marburg (1950)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 62 (1950), S. 31-31 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19500620115
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  • 9
    Electronic Resource
    Electronic Resource
    Bestimmung von Jodiden in jodierten Salzen (1950)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 62 (1950), S. 168-168 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Grögers Methode der Oxydation des Jodids zum Jodat in neutraler Lösung mit Permanganat kann erfolgreich zur Bestimmung kleinster Jod-Mengen verwendet werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19500620705
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  • 10
    Electronic Resource
    Electronic Resource
    Systeme des Energietransports in der lebendigen Substanz (1950)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 62 (1950), S. 256-262 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Unsere Kenntnisse über den verschiedenartigen Energietransport in der lebenden Zelle, für den zahlreiche Modellvorstellungen entwickelt wurden, sind in den letzten Jahren weitgehend ausgebaut worden. Die vorliegende Arbeit gibt einen Überblick und teilt einige neue Befunde mit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19500621103
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