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  • 1960-1964  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 66 (1964), S. 267-273 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An Mäusen eines japanischen Inzuchtstammes (dd) ließ sich zeigen, daß Urethan ein Thymuslymphom hervorrufen kann, wenn es in den ersten Lebensmonaten wiederholt gegeben wird. Bei 6/23 Männchen und 12/24 Weibchen traten im Alter von 135–150 Tagen makroskopisch erkennbare Tumoren auf. Bei 8 Männchen (8/17) und 6 Weibchen (6/12) von den Tieren, die makroskopisch noch frei von Tumoren waren, zeigte der Thymus mikroskopisch frühneoplastische Veränderungen. Die Häufigkeit der neoplastischen und frühneoplastischen Fälle zusammen war also 14/23 bei den Männchen und 18/24 bei den Weibchen. Das Urethan-Lymphom des Thymus war hinsichtlich Histologie und Histogenese identisch mit den von anderen Agentien erzeugten Lymphomen. Die Frühveränderungen sahen aus wie eine regenerative Proliferation undifferenzierter Lymphocyten in der Rinde. Oft wurden sie nur in einem Thymuslappen beobachtet.
    Notes: Summary In inbred mice of a low leukemic strain, dd, urethan was proved to induce thymic lymphoma when it was repeatedly administered early in life. At the age of 135 to 150 days the incidence of the tumor was 6/23 in males and 12/24 in females. In 8 males (8/17) and 6 females (6/12) of mice macroscopically free of the tumor, the thymus revealed microscopically early neoplastic changes. Thus the cumulative incidence of both neoplastic and early neoplastic cases was 14/23 for males and 18/24 for females. The urethan-induced thymic lymphoma was similar, in both histological characteristics and histogenesis, to that induced by other agents. The early lymphomatous changes appeared as replenishment with immature lymphocytes in the cortex after depletion of cortical small lymphocytes. The changes preceding lymphoma were often found in one lobe only of the thymus.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 61 (1964), S. 883-893 
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Histological and histometric studies were made of the adrenal cortex of the mouse during pregnancy and lactation. In earlier pregnancy the cortex histologically shows almost no changes, except that the X zone disappears during this period of the first pregnancy. In later pregnancy and at parturition the fasciculata cells are less vacuolated in appearence and relatively large in size, and their nuclei are remarkably enlarged in volume. After parturition the histophysiological findings of the fasciculata cells are different between lactating and non-lactating mice. In lactating mice the fasciculata cells show a marked increase in vacuolation and a striking enlargement of the size. Their nuclei are also hypertrophie. In non-lactating mice, the fasciculata cells are almost the same both in vacuolation and in size as those of normal females, although their nuclei remain somewhat large in volume. These results are discussed particularly in relation to the thymic changes dealt with in a previous paper (Ito and Hoshino 1962): the histophysiological findings of the fasciculata would give an explanation for the thymic changes during pregnancy and lactation.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 75 (1964), S. 1-10 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde eine Reihe von Versuchen durchgeführt, um die Gültigkeit der Annahme eines einfachen Reihen-Modells für die Berechnung des Elastizitätsmoduls der kristallinen Bereiche in orientierten linearen Polymeren mit Hilfe der röntgenographischen Messungen der Gitterdehnung zu beweisen. Von verschiedenen Proben wie Fäden, Fasern und Filmen von Polyäthylen, Polyvinylalkohol, Polypropylen, Polyoxymethylen und Cellulose wurden die Kraft-Dehnungskurven unter der obigen Annahme konstruiert und die Werte des Moduls miteinander verglichen. Trotz des Unterschiedes zwischen den Mikrostrukturen dieser Proben erhielt man fast den gleichen Gittermodul bei jedem dieser Polymeren. Die großen Unterschiede zwichen den makroskopischen Moduln der Proben hatten keinen Einfluß auf den Gittermodul. Die Gittermoduln von trockenem und mit Wasser gequollenem Polyvinylalkohol oder auch Cellulose unterschieden sich nicht voneinander. Diese Ergebnisse stellen eine starke Stütze für die oben erwähnte Annahme dar.Ferner wird die Dehnungsfähigkeit der verschiedenen Polymer-Moleküle diskutiert.
    Notes: Some experiments were carried out to prove the validity of the assumption of a simple series model for the calculation of the elastic modulus of crystalline regions in oriented linear polymers from X-ray determination of lattice extension. Various specimens such as filaments, fibers, and films were prepared from polyethylene, polyvinyl alcohol, polypropylene, polyoxymethylene and cellulose, stress-strain curves constructed under the assumption of a simple series model; and calculated values of modulus compared. In spite of the differences of microstructures of these specimens, nearly the same value for the lattice modulus was obtained for each polymer. A large difference of specimen moduli had no effect on the lattice modulus. Lattice moduli of dry and water-swollen polyvinyl alcohols or cellulose did not differ from each other. These results are a strong support for the above assumption.Extensibility of various polymer molecules was also discussed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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