然而，两种酵母的活跃时期可能稍微改变。

However, the active period of both yeast may vary a little.

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为了验证此一想法，研究人员培育出三种酵母突变株。

To test this idea, the researchers created three mutant strains of yeast.

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大多数啤酒是用下面酵母发酵而成的，酵母与嘉士伯酵母菌有关，并沉降于发酵缸底部的一种酵母。

Most beers are fermented with bottom yeasts, related to Saccharomyces carlsbergensis, which settle at the bottom of the fermentation vat.

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