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. 1961 Jan;1(3):247–264. doi: 10.1016/s0006-3495(61)86887-2

Physical and Temporal Factors Involved in the Death of Yeast at Subzero Temperatures

Peter Mazur
PMCID: PMC1366304  PMID: 13768689

Abstract

The survival of yeast cells after exposure to subzero temperatures was affected by the cooling and warming velocity, temperature itself, and the physical state of the water surrounding the cells. The cells were injured only when the external medium was frozen and then only when the temperature was -10° or below. Survival dropped abruptly between -10° and -30° regardless of whether the cells were suspended in water or 0.1 M solutions of KH2PO4, NaC1, or CaC12. The critical temperature range of -10° to -30° was unrelated to the temperatures at which the suspending fluids completely solidified, these temperatures being -0.3°, -11°, -30°, and -71° for the four liquids, respectively. Survival at -30° or below was greatly affected by the rate at which the cells were cooled or warmed, with higher survivals being obtained with slow cooling and with rapid warming. Length of exposure at -30° was not a factor; injury was inflicted within 1 minute. The results are interpreted as indicating that death is a result of intracellular ice formation. Internal freezing is believed to occur when external ice crystals grow through aqueous channels in the cell wall or membrane and seed supercooled water in the cell interior.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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