Special diets that were extremely low in protein (5.5%) and high in carbohydrate were used to test the effect of nicotinamide on A/-nitrosodimethylamine-induced Carcinogenesis in Holtzman albino rats. The level of nicotinamide in the three diets ranged from 0 mg/kg of food to 50 mg/kg to 500 mg/kg. During the treatment with these diets (5 weeks) and the carcinogen (18 days), the renal and hepat...

N-nitrosodimethylamine, a potent carcinogen, was produced by three strains each of Proteus mirabilis, P. morganii, and P. rettgeri, but not by three strains of P. vulgaris grown under the same conditions. Many of the alkaline-extractable volatile metabolites elaborated by these organisms are the same, but there are some qualitative and quantitative differences among species. Representative gas-...