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People choose to brew their own beer for a variety of reasons. Many homebrew to avoid a higher cost of buying commercially equivalent beverages. [10] Brewing domestically also affords one the freedom to adjust recipes according to one's own preference, create beverages that are unavailable on the open market or beverages that may contain fewer calories, or less or more alcohol.
The yeast was kept by the farmers themselves between brews. If a farmer had a brew go sour, or found that the yeast in any way had gone bad or died, they were supplied with new, healthy yeast from a neighboring farm. As farming was modernized and beer became commercially available, most farmhouse brewing died out and the yeast cultures with it.
Barm, also called ale yeast, [1] is the foam or scum formed on the top of a fermenting liquid, such as beer, wine, [2] or feedstock for spirits or industrial ethanol distillation. It is used to leaven bread , or set up fermentation in a new batch of liquor.
In beer, the metabolic waste products of yeast are a significant factor. In aerobic conditions, the yeast will use in the glycolysis the simple sugars obtained from the malting process, and convert pyruvate, the major organic product of glycolysis, into carbon dioxide and water via the cellular respiration. Many homebrewers use this aspect of ...
Brewers generally refer to this apparent attenuation when using the word without qualification, [5] although the measurement of real attenuation — the actual percentage of sugar consumed by the yeast — is an important indicator of yeast health and for producing certain styles of beer. A beer which does not attenuate to the expected level in ...
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