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The use of active dry yeasts reduces the variety of strains that appear in spontaneous fermentation by outcompeting those strains that are naturally present. [9] The addition of cultured yeast normally occurs with the yeast first in a dried or "inactive" state and is reactivated in warm water or diluted grape juice prior to being added to the must.
Schizosaccharomyces, the only wine yeast that reproduced by fission whereas most wine yeast reproduce by budding. [4] Zygosaccharomyces, very alcohol-tolerant and can grow in wines up to 18% v/v. Additionally this yeast can survive in extremely high sugar levels (as much as 60% w/w or 60 Brix) and is very resistant to sulfur dioxide. [4]
The vinegar is created over the course of 13 years. [2] Mother of vinegar can also form in store-bought vinegar if there is some residual sugar, leftover yeast and bacteria and/or alcohol contained in the vinegar. This is more common in unpasteurized vinegar, since the pasteurization might not stabilize the process completely. While not ...
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The main bacterial groups are yeast, candida and Hanseniaspora. [5] In addition, microbial diseases of wine are mainly caused by yeast, lactobacillus and acetic acid bacteria. [6] This is because yeast may re-ferment a wine with high sugar content, making it cloudy and impure. [1]
Yeast need a reliable source of nitrogen in forms that they can assimilate in order to successfully complete fermentation. Yeast assimilable nitrogen or YAN is the combination of free amino nitrogen (FAN), ammonia (NH 3) and ammonium (NH 4 +) that is available for a yeast, e.g. the wine yeast Saccharomyces cerevisiae, to use during fermentation.