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Viability of S. cerevisiae YPH250 incubated in water at the presence of R. rosea aqueous extracts. Yeast viability was determined by counting the number of colony-forming units (CFUs) (A) and by staining of dead cells with methylene blue (B). CFU was calculated as the ratio between the numbers of colonies formed to the total number of cells plated. As 100% accepted number of viable cells at day 2. (n=4–6).
