Test strains suspended in skim milk, quickly frozen in dry ice-ethanol, and stored at -70°C can be used as quality control samples that are immediately available by quickly thawing at 37°C. The samples remain homogeneous and stable for at least 1 year, except for Aeromonas hydrophila, which decreases 20 to 30% in 1 year.
CITATION STYLE
Schijven, J. F., Havelaar, A. H., & Bahar, M. (1994). A simple and widely applicable method for preparing homogeneous and stable quality control samples in water microbiology. Applied and Environmental Microbiology. American Society for Microbiology. https://doi.org/10.1128/aem.60.11.4160-4162.1994
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