title: R factor infection of Escherichia coli lyophilized in 1946.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000187:drug effects; D005111:Extrachromosomal Inheritance; D005612:Freeze Drying; D005827:Genetics, Microbial
chemical_list: D000900:Anti-Bacterial Agents