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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 115 (1989), S. 247-252 
    ISSN: 1432-1335
    Keywords: N-Nitrosomorpholine ; 3,4,3′,4′-Tetrachlorobiphenyl ; Tumor promoter ; Cytotoxicity ; Mouse hepatocarcinogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Effects of 3,4,3′,4′-tetrachlorobiphenyl (TCB) on glucose-6-phosphatase (G6Pase)-altered hepatic foci of N-nitrosomorpholine (NNM)-treated B6C3F1 mice were investigated. TCB was chosen as a selective 3-methylcholanthrene-type inducer and tumor promoter. To initiate hepatocarcinogenesis, mice were treated with NNM (160 mg/l, in drinking water for 7 weeks), as in previous studies with the rat model. After a treatment-free interval of 22 weeks, TCB was administered (5×50 mg/kg, every 3 days), and liver foci were analysed 10 weeks after the start of TCB treatment. Unexpectedly, the number of G6Pase-negative and-positive foci per liver was markedly diminished following TCB treatment (to 32% and 57%, respectively). On the other hand, the mean volume of the remaining G6Pase-altered foci was enhanced, owing to an increase in the percentage of foci of large size (〉0.5mm2). Throughout the experimental period of 39 weeks prolonged liver injury due to NNM and TCB treatment was demonstrated by histology and by elevated serum levels of glutamate-oxaloacetate transaminase. The results suggest that (in contrast to the rat system) TCB exhibited opposing effects on liver foci in the mouse model: (a) moderate tumor-promoting effects and (b) cytotoxic effects in NNM-injured liver, leading to decreased numbers of liver foci.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 127 (1996), S. 97-102 
    ISSN: 1434-4475
    Keywords: 3-Vinylindoles ; Carbazoles ; Diels-Alder reactions ; Cytotoxicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die aus den methoxysubstituierten 3-Vinylindolen1 und2 zugänglichen Cycloaddukte3,5 und7 lassen sich mitDDQ zu den coplanar-anellierten Carbazolen4,6 und8 dehydrieren. Verbindung4a, die auch durch eine Röntǵenstrukturanalyse charakterisiert wurde, zeigt signifikante Cytotoxizität gegen Humantumor-Zellinien (K562 und RXF93).
    Notes: Summary The cycloadducts3,5, and7, readily available from methoxy-substituted 3-vinylindoles1 and2, were dehydrogenated withDDQ to the coplanar [a]-anellated carbazoles4,6, and8. Compound4a, also characterized by X-ray structural analysis, shows significant cytotoxicity against K562 und RXF393 human tumor cell lines.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 316 (1962), S. 119-127 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Extremely thin carbon foils were obtained: 1by reduction of graphite oxide (G.O.) suspended in dilute sodium hydroxide,2by deflegration of heated G.O.The adsorption of nitrogen, methylene blue and phenol were measured as well as the catalytic efficiency in the HBr synthesis.With the samples obtained by reduction of G. O., larger surface areas were found by adsorption from solution than by nitrogen adsorption or from the catalytic efficiency. This is explained by the agglomeration of the foils on isolation.With the deflagration product, however, all methods gave the same surface areas. The cause of this different adsorption behaviour is discussed.
    Notes: Sehr dünne Kohlenstoff-Folien wurden erhalten: 1durch Reduktion einer Suspension von Graphitoxyd (G. O.) in verdünnter Natronlauge,2durch Verpuffung von G. O. beim Erhitzen.Die Adsorption von Stickstoff, von Methylenblau und von Phenol wurde gemessen; außerdem wurde die katalytische Leistung bei der HBr-Synthese bestimmt.Bei dem durch Reduktion erhaltenen Präparat wurden mit der Adsorption aus wäßriger Lösung größere spez. Oberflächen gefunden, als mit der Gasadsorption oder aus der katalytischen Leistung. Die größte spez. Oberfläche wurde direkt in der bei der Reduktion erhaltenen Suspension gemessen. Die niederen Werte der spez. Oberfläche sind eine Folge der Agglomeration bei der Isolierung.Im Gegensatz dazu gaben bei dem durch Verpuffen erhaltenen Präparat alle Methoden gleiche spez. Oberflächen. Dieser Unterschied wird darauf zurückgeführt, daß die Folien des durch Verpuffen von G. O. erhaltenen Präparates im Gegensatz zu denen des Reduktionsproduktes durchlöchert sind.Die Messung der katalytischen Leistung ergab, daß die Bromwasserstoff-Bildung an den Basisflächen des Kohlenstoffs erfolgt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 463 (1980), S. 123-131 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Association Behaviour of Strannatranes1-Alkylstannatranes (R = Me, Et, Bu, Phenyl) associate in unpolar solvents to relatively stable trimeric units. In aqueous solution 1-methylstannatran displays no autoassociation. 1-t-Butylstannatran, 1-o-tolylstannatran, and 1-alkylthiostannatranes are monomeric in all kinds of solvents. The association behaviour is characterized by molecular mass estimation and 1H-, 13C-, and 119Sn-NMR measurements.
    Notes: Es wird über einige neue Stannatrane und Thiostannatrane berichtet und gezeigt, daß die 1-Alkylstannatrane in unpolaren Lösungsmitteln zu relativ stabilen trimeren Einheiten assoziieren. In wäßriger Lösung zeigt 1-Methylstannatran keine Selbstassoziation. 1-t-Butylstannatran, 1-o-Tolylstannatran und 1-Alkylthiostannatrane sind in allen Lösungsmitteln monomer. Das Assoziationsverhalten wird durch Molekulargewichtsbestimmung und 1H-, 13C- und 119Sn-NMR-Messungen charakterisiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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