title: Viability of the F strain of Mycoplasma gallisepticum after storage in the frozen or lyophilized state.
abstract: Strain F of Mycoplasma gallisepticum was stored frozen at -60 C or -20 C in liquid medium with or without cryoprotective agents or was lyophilized with or without stabilizers and stored at 4 C. The titer was determined before, during, and after the subsequent storage period. In cultures frozen at -60 C or lyophilized, the titer had not significantly declined by the end of 371 days of storage. At -20 C, the titer of frozen cultures declined rapidly, and no mycoplasma had survived 282 days of storage. The addition of cryoprotective agents (10% glycerol or 8% dimethyl sulfoxide) or freeze-drying stabilizers (12% sucrose, or 7.5% glucose, 8% skim milk, or SPA) did not help maintain the viability of the mycoplasmas during freezing or freeze-drying process and the subsequent storage.
mesh_terms: D000818:Animals; D001431:Bacteriological Techniques / Q000662:veterinary*; D003470:Culture Media; D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D005612:Freeze Drying / Q000379:methods; D005615:Freezing; D005990:Glycerol / Q000494:pharmacology; D009174:Mycoplasma / Q000187:drug effects / Q000502:physiology*
chemical_list: D003470:Culture Media; D005990:Glycerol; D004121:Dimethyl Sulfoxide