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. 1962 Jan;10(1):40–43. doi: 10.1128/am.10.1.40-43.1962

Role of Suspending and Recovery Media in the Survival of Frozen Shigella sonnei1

Mitsuru Nakamura 1, Dixie Ann Dawson 1,2
PMCID: PMC1057805  PMID: 14478140

Abstract

Shigella sonnei was frozen at -20 C in saline, nutrient broth, and milk, and plated, after thawing, upon synthetic medium, nutrient agar, and blood heart infusion agar. There was a difference in the numbers of cells recovered when the frozen and thawed cells were grown on different media. The synthetic medium was unable to recover cells injured by freezing or did so only poorly compared to the complex media. The addition of meat extract, peptone, or Casamino acids to the synthetic medium improved its ability to recover injured cells as measured by bacterial colony counts. This is suggestive of metabolic injury caused by the freezing processes since the cells which survived freezing required an enriched medium for growth. In this paper the term metabolic injury is used to express a change in the nutritional requirements of the organisms which resulted in an increase in growth factor requirements. Freezing the cells in saline resulted in greater injury compared to cells frozen in nutrient broth or milk; this suggested that these suspending agents possessed some protective quality. The metabolic injury increased with an increase in the length of time the cells were held in the frozen state.

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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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