Day, A W Recombination in Ustilago violacea after liquid nitrogen refrigeration. [electronic resource] - Canadian journal of microbiology Nov 1972 - 1639-41 p. digital Publication Type: Journal Article ISSN: 0008-4166 Standard No.: 10.1139/m72-253 doi Subjects--Topical Terms: AllelesBasidiomycota--growth & developmentCell SurvivalCrosses, GeneticFreezingGenesGenetics, MicrobialMutationNitrogenPreservation, BiologicalRadiation EffectsRecombination, GeneticRefrigerationSpores, Fungal--growth & developmentUltraviolet Rays