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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 100 (1981), S. 1047-1054 
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1011-1344
    Keywords: Photodynamic therapy ; lasers ; liposomes. ; phthalocyanine ; tumours
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 19 (1963), S. 316-317 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé L'auteur a étudié histochimiquement l'activité de la succine déhydrogénase lors de la cancérogénèse expérimentale du foie des rats induite par le 3'-méthyl-4-diméthylaminoazobenzène. On a observé une augmentation de l'activité enzymatique dans les stades précancéreux (cholangiofibrose et hypertrophie parenchymateuse) suivie d'une diminution et disparition de cette activité dans les tumeurs développés.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Mutation Research/Environmental Mutagenesis and Related Subjects 216 (1989), S. 295 
    ISSN: 0165-1161
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 70 (1967), S. 109-114 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei der Carcinogenese konnte in der Phase der diffusen Proliferation der ovalen Zellen, bevor sich diese in typische Hepatocyten differenzieren, eine Glucose-6-Phosphatase-Aktivität in vereinzelten solchen Zellen nachgewiesen werden. Bei der Differenzierung dieser ovalen Zellen in Leberzellen bilden sich kleinere Knoten. In den Gallengängen und in dem Epithel dieser Knoten fehlte eine derartige Enzymaktivität. Der Verlust der Glucose-6-Phosphatase-Aktivität in den frühen Stadien der Cancerogenese tritt offenbar nicht während der ersten Umwandlungsschritte zur Neoplasie hin auf. Es ist vielmehr wahrscheinlich, daß bei schweren Parenchymschäden der Erwachsenenleber regeneratorische und proliferative Prozesse ablaufen, wobei primitive Stammzellen sich in Hepatocyten oder die Zellen kleinerer und größerer Gallengänge differenzieren.
    Notes: Summary The cytochemical localization and activity of glucose-6-phosphatase was studied in the early proliferative stage of liver carcinogenesis. In diffuse oval cell proliferation prior to the occurrence of typical hepatocyte differentiation, glucose-6-phosphatase activity was established in individual oval cells. Formation of small liver nodules from oval cells subjected to hepatocyte differentiation was clearly observed in this study. In the separate bile ducts as well as in the epithelium of adenofibrous nodules, however, such activity was lacking. It may be suggested that in the early stages of liver carcinogenesis the loss of glucose-6-phosphatase activity obviously does not develop in the initial transformational steps toward neoplasia. It is probable that in severe injury of the parenchyma in adult liver, regenerative and proliferative processes take place from primitive cells which may differentiate as hepatocytes, cholangiole cells or or bile duct cells.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 84 (1975), S. 223-225 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The damage and repair of rat brain DNA was studied in vivo after a single carcinogenic dose of ethylnitrosourea. Fragmentation of the brain DNA produced by this carcinogen was demonstrated on alkaline sucrose gradients. By the 24th hrs after treatment with ethylnitrosourea the single-strand damage to DNA was not completely repaired. As the highly differentiated cells of the central nervous system do not proliferate, it is possible that during brain carcinogenesis delayed repair of DNA of primitive cells might be needed for the formation of tumor anlage.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 81 (1974), S. 7-13 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wurden die Veränderungen der Nebennierenrindeaktivität bei Ratten nach 4,8 bzw. 16 Wochen chronischer Applikation von Dimethyl- und Diäthylnitrosamin (1,4 bzw. 4,8 mg/kg/pro Tag) untersucht. Die Ergebnisse zeigten, mit Ausnahme der Dosierung von 1,4 mg/kg/pro Tag Diäthylnitrosamin, eine ansteigende Tendenz der Corticosteronwerte in der Nebennierenrinde bzw. im Plasma nach 4 wöchentlicher Behandlung, gefolgt von einer Abnahme des Corticosterongehaltes nach 8 bzw. 16 Wochen. Im Vergleich zu den Kontrollen zeigten die Corticosteronwerte in den Gruppen, die mit höheren Nitrosamin-Dosen behandelt wurden, eine signifikante Abnahme im Plasma und in der Nebennierenrinde. Die Ergebnisse werden im Zusammenhang mit den gefundenen Leberschädigungen besprochen.
    Notes: Summary The changes in the rat adrenal cortex activity after four, eight and sixteen weeks continuous application of dimethylnitrosamine and diethylnitrosamine (1.4 and 4.8 mg/kg/day) were investigated. A sligh increase in both adrenal and plasma corticosterone levels was observed after four weeks treatment. However, longer treatments with the carcinogens resulted in a decrease in the corticosterone levels with the exception of dosing with 1.4 mg/kg/day diethylnitrosamine. The groups of animals that received higher doses of the carcinogens displayed even significantly lower levels of corticosterone than the controls. The possible relationship between adrenal cortex activity and the induced liver damage is discussed.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 71 (1968), S. 59-62 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Highly anaplastic renal tumors (nephroblastoma type) have been induced regularly in rats fed dimethylnitrosamine. In the course of carcinogenesis, proliferative lesions — renal oval cell proliferation — have been commonly observed in the contralateral kidney. To elucidate the histogenesis of the nephroblastoma the histological structure of these tumors and the proliferative lesions are compared. It is assumed that the tumor develops from blastic reserve cell elements in the kidney which possess the potentialities of metanephrotic elements.
    Notes: Zusammenfassung Nach Verfütterung mit Dimethylnitrosamin entwickelten sich bei Ratten stark anaplastische Nierentumoren vom Typus der Nephroblastome. Im Verlaufe der Carcinogenese sind häufig auch in der kontralateralen Niere “proliferative Veränderungen” (Proliferation der ovalen Nierenzellen) beobachtet worden. Zur Klärung der Histogenese dieser Nephroblastome wurde das histologische Bild der Tumoren mit dem der “proliferativen Veränderungen” verglichen. Es wird angenommen, daß der Tumor sich aus “Reservezellen” der Niere entwickelt, die die Eigenschaften der metanephrotischen Elemente aufweisen.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 76 (1971), S. 91-92 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Untersuchung an männlichen Wistar-Ratten zeigt, daß das AAN die cancerogene Wirkung von DMN stark herabsetzt. Die Zahl der Lebertumoren ist von 90% bis auf 10% reduziert.
    Notes: Summary The administration of AAN during the DMN feeding of adult male Wistar rats reduces the hepatocarcinogenic action of DMN; the number of malignant liver tumors induced decreases 80%.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 91 (1978), S. 237-247 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The chromosomal proteins of rat liver were studied by SDS-gel electrophoresis during the process of nitrosomorpholine-induced hepatocarcinogenesis, in the primary hepatomas thus obtained, and in their metastases. It was found that an increased proteolytic activity was present in liver homogenates from carcinogen-fed animals which caused differences between the nonhistone chromosomal proteins of control and carcinogen-treated livers. These differences disappeared in the presence of the protease inhibitor PMSF. In the primary hepatomas slight quantitative changes were observed: an increased amount of two proteins of 43000 and 63000 daltons molecular weight, respectively, and a decrease in the histone subfraction H 1°. In the metastases both quantitative and qualitative differences were detected: a strong decrease in the protein bands corresponding to the contractile proteins α-tubulin, β-tubulin, and actin; an increased content of the 63000 dalton protein; the appearance of new proteins of approximately 60000, 90000, and 120000 daltons molecular weight, and the complete disappearance of histone H1°.
    Type of Medium: Electronic Resource
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