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  • Electronic Resource  (6)
  • 1975-1979  (1)
  • 1965-1969  (5)
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  • Electronic Resource  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Interaction of Heparin with the Plasma Proteins in Relation to Its Antithrombin Activity* (1967)
    s.l. : American Chemical Society
    Biochemistry 6 (1967), S. 1854-1863 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00858a037
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of temperature and developmental stage on feeding by larvae of Sericesthis nigrolineata (Coleoptera: Scarabaeidae) (1975)
    Springer
    Entomologia experimentalis et applicata 18 (1975), S. 244-254 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé La consommation des larves de troisième stade de Sericesthis nigrolineata a été mesurée sous des conditions de température constante. Les larves ont été placées dans un milieu de tourbe humide et nourries de carottes. La consommation augmente de façon exponentielle avec la température entre 4° et 30°; la partie inférieure de la courbe résulte du fait que les larves cessent de se nourrir, mais au haut de la courbe les larves sont tuées par les hautes températures. Les taux relatifs de croissance larvaire atteignent leur apogée à 17.5° et la croissance est nulle à 5° et 32°; le coefficient d'utilisation digestive est le plus élevé à 14° avec une valeur maximum de 11%. Les larves de troisième stade ont perdu du poids mais ont continué à se nourrir sauf pendant une courte période avant de se transformer en prépupes. Le développement larvaire dépend de la température et il n'y a aucune évidence de diapause pour les larves. En supposant qu'il n'y ait aucun changement dans le taux de croissance, on estime qu'une larve consomme 4237–5085 mg de carotte (poids humide) au cours de sa vie et la proportion de nourriture prise par les larves de premier, second et troisième stade augmente régulièrement d'un facteur × 3,5 à peu près entre chaque stade. Les données de consommation estimées pour les larves de S. nigrolineata, en se servant de carottes comme source de nourriture, représentent la meilleure estimation de ration alimentaire dont on dispose, en attendant que la consommation de racines d'herbe puisse être mesurée directement.
    Notes: Abstract Consumption of carrot by third-instar larvae of Sericesthis nigrolineata was measured under conditions of constant temperature. Consumption increased curvilinearly with increasing temperature between 4° and 30°. Larvae stopped feeding at the lower threshold, but at the upper threshold larval mortality prevented further feeding. Larval relative growth rate peaked at 17.5°, with zero growth at 5° and 32°, and the proportion of food converted to growth was greatest at 14° with a value of 11%. Late third-instar larvae lost weight but continued feeding, except for a short non-feeding period, before entering the prepupal stage. There was no evidence for a diapause by mature larvae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00299994
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  • 3
    Electronic Resource
    Electronic Resource
    Structural characterization of vulcanizates. Part V. Determination of degree of chemical crosslinking of natural rubber gum vulcanizate networks (1967)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 2215-2226 
    Details
    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: A general treatment is given of the methods to be used in other parts of this series for calculating the degree of chemical crosslinking in natural rubber vulcanizates from stress-strain measurements in extension and from equilibrium volume swelling measurements. Corrections are required for the presence in the vulcanizate of appreciable quantities of particulate solids or soluble diluents and for the introduction of foreign atoms into the rubber network. For this purpose distinction is made between the rubber vulcanizate, the rubber matrix, the rubber network, and the rubber hydrocarbon component of the network. Expressions are derived, in terms of these concepts, for the Money-Rivlin parameter, C1, measured on vulcanizates which have undergone various treatments.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1967.070111111
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  • 4
    Electronic Resource
    Electronic Resource
    Structural characterization of vulcanizates. Part VIII. The N-cyclohexylbenzothiazole-2-sulfenamide-accelerated sulfur vulcanization of natural rubber at 140-180°C. and of synthetic cis-1,4-polyisoprene at 140°C (1967)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 2271-2283 
    Details
    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: Vulcanization of natural rubber at 140°C. with a CBS-accelerated sulfur system of conventional type gives rise to a structurally complex network in which the number of sulfur atoms combined per chemical crosslink present increases from 12 to 21 with increasing reaction time. The complexity of the network increases with increasing temperature of vulcanization. Crosslinking of a purified synthetic cis-1,4-polyisoprene proceeds more slowly and yields a slightly more complex network. Despite this overall similarity the natural rubber vulcanizates exhibit considerably higher tensile strengths.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1967.070111114
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  • 5
    Electronic Resource
    Electronic Resource
    Structural characterization of vulcanizates. Part VII. The N-cyclohexylbenzothiazole-2-sulfenamide-accelerated natural rubber-sulfur system (1967)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 2255-2269 
    Details
    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: The crosslinking efficiency of sulfur in the vulcanization system comprising (in parts by weight) natural rubber (100), sulfur (1.5), N-cyclohexylbenzothiazole-2-sulfenamide (2.37), zinc oxide (5), and lauric acid (1-10) is relatively insensitive to the lauric acid concentration and to the temperature of vulcanization (between 100 and 140°C.). The networks formed contain initially 8-11 combined sulfur atoms per chemical crosslink present, but this number falls progressively to about 4 as the reaction proceeds. The results are consistent with the intermediate formation of a rubber-soluble complex of cyclohexylamine with zinc benzothiazolyl mercaptide. This complex is believed to be responsible also for the further slow crosslinking which the vulcanizates undergo on standing at room temperature.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1967.070111113
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  • 6
    Electronic Resource
    Electronic Resource
    Structural characterization of vulcanizates. Part VI. The 2-mercaptobenzothiazole-accelerated natural rubber-sulfur system (1967)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 2227-2253 
    Details
    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: The crosslinking efficiency of sulfur in the vulcanization of natural rubber in the presence of 2-mercaptobenzothiazole, zinc oxide, and lauric acid has been determined as a function of cure time, cure temperature, and lauric acid concentration. With a low concentration of lauric acid structurally complex networks are formed, which contain 11-19 combined sulfur atoms per chemical crosslink present. The complexity increases with time of vulcanization. With a high lauric acid concentration much simpler networks are formed, which become progressively more simple as reaction proceeds (6 network-combined sulfur atoms per chemical crosslink, decreasing to 2.4 with time). Increasing the cure temperature from 100 to 140°C. reduces the efficiency of crosslinking in both cases. The changes in efficiency are attributed to the influences of the reaction variables (in particular, the concentration of rubber-soluble complexes of the zinc laurate with zinc benzothiazolyl mercaptide) on the structure and subsequent reactions of initially formed polysulfidic crosslinks.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1967.070111112
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