J clemmesen (9 Ergebnisse)

Zustand: Very Good. *Price HAS BEEN REDUCED by 10% until Monday, Sept. 28 (weekend SALE item)* 178 pp., Hardcover, bookplate to front paste down, else very good in a very good dust jacket. - If you are reading this, this item is actually (physically) in our stock and ready for shipment once ordered. We are not bookjackers. Buyer is responsible for any additional duties, taxes, or fees required by recipient's country. …

24 cm. original paperback. viii,336 pp. some ills, diagrams. references. index. ISBN New York: 0387095845. "Archives of Toxicology / Archiv für Toxikologie". -(libr label, library stamps, with plasticized cover (einbandfolie), signs of use, otherwise good). 620g.

Softcover. VII, 336 S. : 64 Ill. u. graph. Darst. ; 25 cm Good condition. Reading pages are very clean and without marks. Retired library exemplar. Slight traces of storage or usage. Otherwise very good exemplar. 9783540095842 Sprache: Englisch Gewicht in Gramm: 649 Softcover reprint of the original 1st ed. 1980.…

Zustand: New. In English.

Zustand: Sehr gut. Zustand: Sehr gut | Seiten: 348 | Sprache: Englisch | Produktart: Bücher | N-nitroso-compounds form an important class of carcinogenic chemicals which may be of environmental importance (Druckrey et al. , 1967; Magee et al. , 1976; IARC, 1978). The mechanism by which these carcinogens initiate neoplastic growth is not well understood but there is substantial evidence favoring the hypothesis that the simple dialkylnitrosamines and alkylnitrosamides act by means of their conversion to al­ kylating agents. Alkylating species are generated from the nitrosamines by metabolic activation and from the nitrosamides by chemical decomposition at physiological pH. It is widely believed that DNA is the critical alkylation target. Alkylation takes place at at least 12 sites within the DNA molecule (Lawley, 1976; Singer, 1976; Pegg, 1977a). Al­ though alkylation at the 7-position of guanine is the most extensive reaction with the DNA bases and provides a reliable measurement of the degree of interaction with the carcinogen (Swann and Magee, 1968, 1971), recent experiments have suggested that alkylation of oxygen atoms may be the critical reaction (Goth and Rajewsky, 1974; Margison and Kleihues, 1975; Nicoll et aI. , 1975; Pegg, 1977a). These laboratories have observed a correlation between the production and persistence of 06-alkyl­ guanine and the occurrence oftumors in a variety of organs of rodents exposed to N-ni­ troso-carcinogens. It has, therefore, been suggested that the ability of tissues to catalyze the removal of 06-alkylguanine from DNA may provide a protective mechanism against carcinogenesis.…

Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - N-nitroso-compounds form an important class of carcinogenic chemicals which may be of environmental importance (Druckrey et al. , 1967; Magee et al. , 1976; IARC, 1978). The mechanism by which these carcinogens initiate neoplastic growth is not well understood but there is substantial evidence favoring the hypothesis that the simple dialkylnitrosamines and alkylnitrosamides act by means of their conversion to al kylating agents. Alkylating species are generated from the nitrosamines by metabolic activation and from the nitrosamides by chemical decomposition at physiological pH. It is widely believed that DNA is the critical alkylation target. Alkylation takes place at at least 12 sites within the DNA molecule (Lawley, 1976; Singer, 1976; Pegg, 1977a). Al though alkylation at the 7-position of guanine is the most extensive reaction with the DNA bases and provides a reliable measurement of the degree of interaction with the carcinogen (Swann and Magee, 1968, 1971), recent experiments have suggested that alkylation of oxygen atoms may be the critical reaction (Goth and Rajewsky, 1974; Margison and Kleihues, 1975; Nicoll et aI. , 1975; Pegg, 1977a). These laboratories have observed a correlation between the production and persistence of 06-alkyl guanine and the occurrence oftumors in a variety of organs of rodents exposed to N-ni troso-carcinogens. It has, therefore, been suggested that the ability of tissues to catalyze the removal of 06-alkylguanine from DNA may provide a protective mechanism against carcinogenesis.…

Paperback. Zustand: Brand New. 348 pages. 9.61x6.69x0.79 inches. In Stock.

Zustand: gut. 1980. Quantitative aspects of risk assessment in chemical carcinogenesis : symposium held in Rome/Italy, April 3 - 6, 1979 / ed. by J. Clemmesen . Techn. ed. A. Waring / Archives of toxicology / Supplement ; 3 In deutscher Sprache. pages.

Zustand: Good. Your purchase helps support Sri Lankan Children's Charity 'The Rainbow Centre'. Ex-library, so some stamps and wear, but in good overall condition. Our donations to The Rainbow Centre have helped provide an education and a safe haven to hundreds of children who live in appalling conditions.…