title: Nalidixic acid as a selective agent for the isolation of enterobacteria from river water.
abstract: Enterobacteria are more resistant to nalidixic acid than the majority of other Gram-negative organisms isolated from river water, so allowing their selection on MacConkey agar containing nalidixic aicd. Selection is further improved by anaerobic incubation which, with nalidixic acid, virtually eliminates oxidase-postivie strains such as Pseudomonas or Aeromonas.
mesh_terms: D000667:Ampicillin / Q000494:pharmacology; D002701:Chloramphenicol / Q000494:pharmacology; D003470:Culture Media; D004755:Enterobacteriaceae / Q000187:drug effects / Q000302:isolation & purification*; D005618:Fresh Water; D007612:Kanamycin / Q000494:pharmacology; D009268:Nalidixic Acid / Q000494:pharmacology; D010403:Penicillin Resistance; D013307:Streptomycin / Q000494:pharmacology; D013752:Tetracycline / Q000494:pharmacology; D014871:Water Microbiology
chemical_list: D003470:Culture Media; D009268:Nalidixic Acid; D007612:Kanamycin; D002701:Chloramphenicol; D000667:Ampicillin; D013752:Tetracycline; D013307:Streptomycin