title: A simple plate-assay method for distinguishing between competitive and noncompetitive antagonism.
mesh_terms: D000362:Agar; D001681:Biological Assay; D004058:Diffusion; D004336:Drug Antagonism; D004926:Escherichia coli / Q000187:drug effects*; D008433:Mathematics; D008722:Methods; D014805:Vitamin B 12 / Q000037:antagonists & inhibitors / Q000494:pharmacology*
chemical_list: D000362:Agar; D014805:Vitamin B 12