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- W2004302524 abstract "Abstract Background Quality control standards provide a quantity of microorganisms for routine use in microbiology to demonstrate the efficacy of testing methods and culture media. Standards are normally prepared by diluting a culture of microorganisms to obtain a suspension that contains an estimated number of colony‐forming units per milliliter. The variability and inaccuracy of these standards increase the potential for false results. Flow cytometry has been used extensively to prepare precise standards of Cryptosporidium and Giardia that contain exact numbers of organisms in a volume of liquid ( 1 ). However, the same levels of accuracy have yet to be obtained for bacterial quality control standards. Methods A modification of a Becton Dickinson FACScalibur flow cytometer enabled 30 bacterial cells to be sorted into a single droplet, mixed with a cryoprotective solution within the droplet, and frozen in liquid nitrogen. The frozen droplets were then freeze dried for stable preservation of the viable bacterial cells. Results A freeze‐dried sphere 3 mm in diameter was produced, which contained 30 microorganisms. The within‐batch variation for these freeze‐dried spheres was no greater than two standard deviations, and the between‐batch variation was less than one standard deviation. Conclusions Bacterial reference controls can now be produced with consistent accuracy and unparalleled precision, thus enabling harmonization across the microbiological testing industry. © 2004 Wiley‐Liss, Inc." @default.
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- W2004302524 date "2004-10-31" @default.
- W2004302524 modified "2023-10-14" @default.
- W2004302524 title "Production of precise microbiology standards using flow cytometry and freeze drying" @default.
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- W2004302524 doi "https://doi.org/10.1002/cyto.a.20075" @default.
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