473 research outputs found
<Abstract of annual report>Mutagenicity of N-Nitrosodiethanolamine in the Salmonella/Microsome Test.
HETEROTACTIC POLY(N-ISOPROPYLACRYLAMIDE)
Radical polymerization of N-isopropylacrylamide (NIPAAm) in toluene at low temperatures, in the presence of fluorinated alcohols, produced heterotactic polymer comprising an alternating sequence of meso and racemo dyads. The heterotacticity reached 70% in triads when polymerization was carried out at –40°C using nonafluoro-tert-butanol as the added alcohol. NMR analysis revealed that formation of a 1:1 complex of NIPAAm and fluorinated alcohol through C=O•••H-O hydrogen bonding induces the heterotactic specificity. A mechanism for the heterotactic-specific polymerization is proposed. Examination of the phase transition behavior of aqueous solutions of heterotactic poly(NIPAAm) revealed that the hysteresis of the phase transition between the heating and cooling cycles depended on the average length of meso dyads in poly(NIPAAm)
<Abstract of annual report>Activation of Carcinogenic N-Nitrosopropylamines to Mutagens by Lung and Pancreas S9 Fractions from Various Animal Species and Man.
<Abstract of published report>Effect of cigarette smoke on the mutagenic activation of various carcinogens in hamster.
<Abstract of annual report>Mutagenesis of Isopropanolamines and Ethanolamines after Reaction with Sodium Nitrite.
<Abstract of annual report>A Comparative Study of the Mutagenic Activation of N-Nitrosopropylamines by Various Animal Species and Man : Evidence for a Cytochrome P-450 Dependent Reaction.
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