Jonathan Holt, a 20 year old male from the Internet asks on December 21, 1999,Why is oxygen used in the brewing industries' fermentation tanks? What types of yeast or bacteria are used to produce their product?
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In order to get a good start, yeast requires oxygen for initial growth. If it doesn't have enough oxygen initially, it will take a long time for the brew to ferment. There are probably thousands of yeasts to choose from. You can find a list on this site: http://www.wyeastlab.com/beprlist.htm.
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