Ale yeast strains are best used at temperatures ranging from 10 to 25°C, though some strains will not actively ferment below 12°C (33). Ale yeasts are generally regarded as top-fermenting yeasts since they rise to the surface during fermentation, creating a very thick, rich yeast head. That is why the term "top-fermenting" is associated with ale yeasts. Fermentation by ale yeasts at these relatively warmer temperatures produces a beer high in esters and higher alcohols, which many regard as a distinctive character of ale beers.
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Within This Chapter: Brewers Yeast
- Introduction to Brewers Yeast
- Ale Yeast
- Lager Yeast
- Yeast Life Cycle During the Beer Brewing Process
- Yeast Nutritional Requirements in Brewing Beer
- Yeast Byproducts in Brewing Beer
- Yeast Strain Selection in Brewing Beer
- Pure Culture Maintenance
- Yeast Propagation and Scale-Up
- Culture Contamination
- Yeast Washing
- Yeast Viability and Replacement
- Yeast Storage