You are using an old browser that may not function as expected. For a better, safer browsing experience, please upgrade your browser.

Log in Become a Member


Single-celled microorganisms belonging to the fungus family (Thallophyde = plants without roots and leaves), in spherical, oval, elongated to cylindrical or pointed form. The size is between 5 and 14 thousandths of a millimetre (but considerably larger than bacteria). Most of them reproduce rapidly by cell sprouting, which is why they are also called "shoot fungi". This process can occur up to 35 times. The yeasts mainly need sugar as an energy source, as well as some nutrients and trace elements, most of which are present in grape must. The yeasts play a decisive role in winemaking. During fermentation, the sugars glucose (grape sugar) and fructose (fruit sugar) are converted into ethanol (alcohol) and carbon dioxide. The French scientist Louis Pasteur (1822-1895) made a special contribution to the study of this complex process.

The world's largest Lexikon of wine terms.

24.358 Keywords · 48.032 Synonyms · 5.311 Translations · 29.674 Pronunciations · 164.360 Cross-references
made with by our Experts. About the Lexicon