title: Long-term preservation of yeast cultures in liquid nitrogen.
abstract: Nineteen strains of taxonomically diverse yeast species tested survived freezing and subsequent five-year storage in liquid nitrogen at - 196 degrees C, using a medium M 2 composed of malt extract, yeast extract, peptone, calf serum and dimethyl sulfoxide. Viability of the yeast cultures after long-term storage ranged from 5 to 97% (average 62%) compared with the viability of the cultures prior to freezing. The use of liquid nitrogen refrigeration for preserving yeast cultures is strongly advocated.
mesh_terms: D009584:Nitrogen; D012034:Refrigeration; D015003:Yeasts / Q000502:physiology*
chemical_list: D009584:Nitrogen