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With the appropriate filter sets of both Bryte-HS (Bio-Rad, Hercules, CA) and FACScan (Becton Dickinson, San Jose, CA) flow cytometers, the measurement of separated green (SYBR Green I), orange-red (propidium iodide), and far red (RPE-Cy5) fluorescence was possible, allowing the enumeration of viable immunodetected bacteria. The entire protocol is completed in less than 3 h, offering numerous possibilities for rapid and precise analyses in sanitary, industrial, and environmental microbiology.
Barbesti et al. (Sat,) studied this question.