title: Aseptic work under various hygienic conditions.
mesh_terms: D000391:Air Microbiology; D004340:Drug Contamination / Q000517:prevention & control*; D004780:Environment, Controlled; D005374:Filtration; D008722:Methods; D009824:Ointments / Q000592:standards; D013678:Technology, Pharmaceutical
chemical_list: D009824:Ointments