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These yeast started out with a similar roots s.cerevisiae and diverged some time around the 15th Century, when it is thought to have hybridized with a new world yeast(Saccharomyces eubayanus). It is then likely that the yeast harvesting methods of different brewing techniques progressively selected for more specific varieties. In British and similar ...


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They are two different species: Saccharomyces cerevisiae and Saccharomyces pastorianus. They both do the same thing--convert sugar into alcohol--but they thrive in different conditions. The main difference is that lager yeasts continue to function at almost-freezing temperatures, while ale yeasts go dormant. The terms 'top-fermenting' and ...



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