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Main article: Berliner Weisse. At one time the most popular alcoholic beverage in Berlin, this is a somewhat weaker (usually around 3% abv) beer made sour by use of Lactobacillus bacteria. This type of beer is usually served with flavored syrups to balance the tart flavor.
Since Pasteur's work, several types of microorganisms (including yeast and some bacteria) have been used to break down pyruvic acid to produce ethanol in beer brewing and wine making. The other by-product of fermentation, carbon dioxide, is used in bread making and the production of carbonated beverages.