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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 ...


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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