title: The ecology of r factors.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects* / Q000201:enzymology; D001893:Borneo; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000187:drug effects / Q000302:isolation & purification; D005827:Genetics, Microbial; D006801:Humans
chemical_list: D000900:Anti-Bacterial Agents