title: [Growth and cell structure of oral spirochetes and effect of benzyl penicillin potassium (author's transl)].
mesh_terms: D005614:Freeze Fracturing; D008854:Microscopy, Electron; D009055:Mouth / Q000382:microbiology; D010400:Penicillin G / Q000494:pharmacology*; D013144:Spirochaetales / Q000187:drug effects* / Q000648:ultrastructure
chemical_list: D010400:Penicillin G