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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis simulation by synthon substitution (1990)
    s.l. : American Chemical Society
    Journal of chemical information and modeling 30 (1990), S. 490-491 
    Details
    ISSN: 1520-5142
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ci00068a022
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  • 2
    Electronic Resource
    Electronic Resource
    Benz-azpentalen-salze
    Amsterdam : Elsevier
    Tetrahedron Letters 4 (1963), S. 163-165 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(01)90598-2
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  • 3
    Electronic Resource
    Electronic Resource
    Prevalence of hepatitis C virus infections in dialysis patients and their contacts using a second generation enzymed-linked immunosorbent assay (1992)
    Springer
    Medical microbiology and immunology 181 (1992), S. 173-180 
    Details
    ISSN: 1432-1831
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The prevalence of antibodies to the hepatitis C virus (HCV) was determined in 498 hemodialysis patients from three german dialysis units, 121 staff members and 42 family members using an enzyme-linked immunosorbent assay (ELISA) of the second generation which detects antibodies to a structural (C22) and to non-structural (C33c, C100, 5-1-1) recombinant antigens to HCV. Using the second generation ELISA 115 patients (23.1 %) were anti-HCV positive versus 77 (15.5%) when sera were tested by an ELISA of the first generation containing only a non-structural antigen (C100). In 34 of these 40 discordant sera antibodies against at least one viral protein was found by a recombinant immunoblot assay. Of 5 sera containing antibodies to only one viral protein (C22) 3 were HCV RNA positive by polymerase chain reaction. Epidemiological evaluation of the patients revealed that the prevalence of anti-HCV was correlated to the duration of dialysis but not to the number of blood transfusions. Of 121 staff members 2 (1.6%) and 2 of 42 family members (4.7%) were positive indicating a low risk of the patients' contacts of acquiring HCV infection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202057
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  • 4
    Electronic Resource
    Electronic Resource
    Measurement of residual stresses in heat treated steels (1994)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 349 (1994), S. 165-167 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The application of a new apparatus for the mechanical analysis of residual stress is described; this enables the determination of the distribution of residual stresses of the first kind over the cross-section of bar-shaped specimens. Results of residual stress analysis on heat-treated specimens of heat treatable steel 42CrMo4 (1.7225) are presented and compared with those from the X-ray diffraction method and the incremental hole drilling method. The residual stresses measured by the X-ray diffraction method at the surface agree well with the results of the layer removal method, whereas in this case incremental hole drilling led to erroneous results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323253
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  • 5
    Electronic Resource
    Electronic Resource
    Säure-katalysierte Oxidation von Isonitrilen durch Dimethylsulfoxid (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 79 (1967), S. 145-145 
    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.19670790304
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  • 6
    Electronic Resource
    Electronic Resource
    Azomethinfarbstoffe - Sensibilisatoren, Löscher und Reaktionspartner für Singulettsauerstoff (1987)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 767-774 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Azomethine Dyes  -  Sensitizers, Quenchers and Reaction Partner for Singlet OxygenAzomethine dyes show photofading in photographic materials, possibly due to oxidation by singlet oxygen. The azomethine dyes 1a-h, 2a-h, 3c, d, f are inefficient photosensitizers of singlet oxygen formation. In tetrachloromethane the quantum yield φ1O2 is in the range between 8 · 10-4 and 4 · 10-3.Contrary to the literature we found that azomethine dyes react with 1O2 (kr). The reaction constants were measured by a competetive technique using 9, 10-diphenyl anthracene and methylene blue as 1O2 sensitizer. The values of kr show that the reaction of the dyes with 1O2 can not be ignored. Besides this reaction, 1O2 is also quenched by the dyes (kq). The values of kq point to quenching of 1O2 by the tertiary amino group of the dyes via a CT-mechanism. This study shows that in photofading of azomethine dyes the oxydation by 1O2 must be taken into consideration.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19873290503
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  • 7
    Electronic Resource
    Electronic Resource
    Spektralverhalten von Pyrazolin-5-on-Azomethinfarbstoffen - Quantenchemische Beschreibung der SubstituenteneinflüsseHerrn Prof. Dr. Dr. H. G. O. Becker zum 65. Geburtstag gewidmet (1987)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 119-125 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Absorption Behaviour of Pyrazoline-5-one Azomethine Dyes - Quantumchemical Description of the Influence of SubstituentsThe VIS absorption of the pyrazoline-5-one azomethine dyes 1a-h is measured in dependence of the substituents of the amino group.HMO calculations confirm that the „x- and y-bands“ have a strong charge transfer character. The absorptions in the visible region correspond to a transition from the HOMO mainly localized at the amino-substituted phenyl to the complex acceptor 4-imino-pyrazoline-5-one (“x-band”) or to the pyrazoline-5-one fragment (“y-band”). The calculated transition energies correlate with the values νmax of the x-band (r = 0.993). There is also a linear correlation between the square of the LCAO-MO coefficients in position 7 and 6 of the dye and εmax (r = 0.978).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19873290117
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  • 8
    Electronic Resource
    Electronic Resource
    Fotosensibilisierte Ausbleichung von Azomethinfarbstoffen (1988)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 204-212 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Fotosensitized Fading of Azomethine DyesThe quantum yields of photofading of the azomethine dyes 1a - h were determined in the presence of the sensitizers benzophenone (B), michler's ketone (MK) and anthracen (A), in isopropanol and benzene. In isopropanol, excluding oxygen, the leuco dyes 5 are formed by benzophenone in high quantum yield (ΦBAr = 0.4). Photofading also takes place using Michler's ketone (ΦMKAr ≅ 3 · 10-3) and anthracene (ΦAAr ≅ 1 · 10-4), but 5 was not found. With benzophenone (Φ2AO ≅ 7 · 10-3), Micher's ketone (ΦMKO2 ≅ 1 · 10-3) and anthracene (ΦAO2 ≅ 1 · 10-4) as sensitizers the chromophore of 1a - h were destroyed, when oxygen was present. The photofading with benzophenone and Michler's ketone is a result of radicalic processes.Radical scavangers 8 and 9, therefore, give a strong decrease of the quantum yield of photofading. The photofading in benzene corresponds to the results in isopropanol considering the lower potential of this solvent for photoreduction processes.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19883300206
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  • 9
    Electronic Resource
    Electronic Resource
    Das Lösungsmittel DimethylsulfoxidUnserem verehrten Lehrer, Herrn Professor Alfred Rieche, zum 65. Geburtstag gewidmet (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 79 (1967), S. 340-357 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das dipolare, aprotonische Lösungsmittel Dimethylsulfoxid verfügt über einen weiten Bereich des flüssigen Aggregatzustandes, hohe Elektronendonatorfähigkeit und Polarität. Darauf beruht sein ausgezeichnetes und selektives Lösungsvermögen für eine Vielzahl organischer, auch polymerer Verbindungen, die Fähigkeit zur H-Brückenbindung und Dipol-Dipol-Assoziation. Die Struktur des Dimethylsulfoxids mit einem „harten“ Sauerstoff- und einem „weichen“ Schwefelatom bewirkt eine gute Kationen- und eine schlechte Anionensolvatation. Mischungen von Alkoholaten mit Dimethylsulfoxid gehören daher zu den basischsten Systemen der organischen Chemie und sind hervorragend zur Deprotonierung schwach acider OH-, NH- und CH-Bindungen, zu Eliminierungen und zur Auslösung von Polymerisationsreaktionen geeignet.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19670790803
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  • 10
    Electronic Resource
    Electronic Resource
    Acid-Catalysed Oxidation of Isocyanides with Dimethyl Sulfoxide (1967)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 6 (1967), S. 168-169 
    Details
    ISSN: 0570-0833
    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/anie.196701682
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