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- Yeasts are single-celled fungi.
- Saccharomyces cerevisiae (sugar loving yeasts) are the predominant genus of yeasts involved in winemaking.
- Yeasts convert sugar to alcohol and carbon dioxide (CO2) during fermentation.
- Yeast that produce undesirable compounds are considered spoilage yeasts.
- In the production of Flor sherry, surface yeasts are utilised to convert alcohol to acetaldehyde and other aldehydes as part of the styles flavour complexity.