title: Axenic storage of small volumes of Tetrahymena cultures under liquid nitrogen: A miniaturized procedure.
mesh_terms: D000818:Animals; D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D005615:Freezing; D009584:Nitrogen; D011309:Preservation, Biological / Q000295:instrumentation / Q000379:methods*; D013768:Tetrahymena / Q000502:physiology*
chemical_list: D009584:Nitrogen; D004121:Dimethyl Sulfoxide