title: A rapid technique for obtaining one-step or multi-step antibiotic resistant mutants employing mutator strains of Escherichia coli K12.
mesh_terms: D000667:Ampicillin / Q000494:pharmacology*; D001431:Bacteriological Techniques; D003227:Conjugation, Genetic; D004926:Escherichia coli / Q000187:drug effects / Q000302:isolation & purification*; D009154:Mutation; D010403:Penicillin Resistance; D011113:Polymyxins / Q000494:pharmacology*; D011995:Recombination, Genetic; D013307:Streptomycin / Q000494:pharmacology*
chemical_list: D011113:Polymyxins; D000667:Ampicillin; D013307:Streptomycin