Abstract
A limited survey has been carried out on samples of pressed yeast from 10 different breweries, clones isolated from these yeasts being differentiated by their giant colony characteristics. The viability of pressed yeast packed in McCartney bottles is little affected by transportation and by storage under normal conditions for short periods. However, pressed yeast is not suitable for a survey of the type contemplated, and although head yeast shows greater viability it, too, is unsuitable as selective effects may occur in head formation; yeast from suspension during fermentation appears most profitable for this type of work.

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