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The usefulness of ScepterTM cell counter analyzer (produced by Merck) was tested to assess the physiological and morphological state of distillers' yeast in conditions of ethanol stress. Yeast cells were divided into four size classes and on the basis of their structure, the physiological and morphological status of the analyzed yeast populations was determined. Measurements of the amount and size of yeast cells with the ScepterTM cell counter are simple, fast and accurate. This device has a large application potential in ethanolic fermentation studies using yeast both in scientific research and in industrial plants. [ABSTRACT FROM AUTHOR]