Saccharomyces cerevisiae Meyen ex E.C. Hansen
ATCC determines the biosafety level of a material based on our risk assessment as guided by the current edition of Biosafety in Microbiological and Biomedical Laboratories (BMBL), U.S. Department of Health and Human Services. It is your responsibility to understand the hazards associated with the material per your organization’s policies and procedures as well as any other applicable regulations as enforced by your local or national agencies.
ATCC highly recommends that appropriate personal protective equipment is always used when handling vials. For cultures that require storage in liquid nitrogen, it is important to note that some vials may leak when submersed in liquid nitrogen and will slowly fill with liquid nitrogen. Upon thawing, the conversion of the liquid nitrogen back to its gas phase may result in the vial exploding or blowing off its cap with dangerous force creating flying debris. Unless necessary, ATCC recommends that these cultures be stored in the vapor phase of liquid nitrogen rather than submersed in liquid nitrogen.
Frozen ampules packed in dry ice should either be thawed immediately or stored in liquid nitrogen. If liquid nitrogen storage facilities are not available, frozen ampules may be stored at or below -70°C. Do not under any circumstance store frozen ampules at refrigerator freezer temperatures (generally -20°C) for long-term storage. Long-term storage of frozen material at this temperature will result in the death of the culture.
1. To thaw a frozen ampule, place it at room temperature or in 30°C water bath, until just thawed (around 1.5 min). Immerse the ampule just sufficient to cover the frozen material.
2. Immediately after thawing, aseptically transfer the culture into a test tube or plate with medium recommended.
3. Incubate the test tube or plate at the temperature recommended.
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Winzeler EA, et al. Functional characterization of the S. cerevisiae genome by gene deletion and parallel analysis. Science 285: 901-906, 1999. PubMed: 10436161
Chromosome: 7, YGR157W, Record nbr: 24787, Gene name: CHO2
Saccharomyces Genome Deletion Project, personal communication