title: Freezing and storage in liquid nitrogen of axenically and monoxenically cultivated Tetrahymena pyriformis.
mesh_terms: D002470:Cell Survival; D003470:Culture Media; D005615:Freezing; D008722:Methods; D009154:Mutation; D009584:Nitrogen; D011309:Preservation, Biological; D013769:Tetrahymena pyriformis / Q000254:growth & development*
chemical_list: D003470:Culture Media; D009584:Nitrogen