The recent extensive use of antibacterial agents has been instrumental in developing new procedures in the study of bacterial inheritance. Much has been written on the genetic aspects of bacterial resistance to penicillin, streptomycin, and other chemotherapeutic agents, and it is now conceded that these resistant variants arise by spontaneous mutation. In the case of streptomycin there has als...

A series of sulfonamide compounds, para-aminohippurate, and inulin were used to study the permeability of the epithelium of human sweat glands. Inulin was not excreted in the sweat. The ratios of the concentrations in sweat to the concentrations in plasma, S/P, of sulfanilamide, sulfapyridine, sulfathiazole, sulfadiazine, and para-aminohippurate were found to be 0.69, 0.58, 0.13, 0.11, and 0.02...

1. The rates of growth and of oxygen consumption by cells of E. coli have been measured under identical conditions, and the effects of sulfathiazole (ST) and of n-propyl carbamate (PC) on these two processes have been compared. 2. The rate of growth was measured by (a) the increase in the viable cell count, (b) the increase in the optical density of the culture, (c) the increase in the rate of ...

Abstract In this study, magnetic-dispersive solid-phase extraction coupled with ion pair-dispersive liquid–liquid micro-extraction (MSPE-i-DLLME) was used to the pre-concentration and of five sulfonamides residues (sulfadiazine, sulfathiazole, sulfacetamide, sulfamethazine sulfamethoxazole) in animal foodstuffs. The are extracted using magnetic carbon nanocomposite then eluted acetonitrile. DLL...