Unicellular microorganisms belonging to the fungi (formerly categorised as thallophytes, now classified as fungi) in spherical, oval, elongated to cylindrical or pointed form. The size is between 5 and 14 thousandths of a millimetre (but significantly larger than bacteria). Yeast cells are colourless to slightly cream-coloured and mostly odourless, but can develop a slightly yeasty, bread-like odour in larger accumulations. Most of them multiply rapidly by cell sprouting (sprout fungi); this process can take place up to 35 times.

Picture left: a "Saccharomyces cerevisiae" (1 graduation mark is 1 µm). Picture right: Yeast cells with sprouting scars.
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Roman Horvath MW
Domäne Wachau (Wachau)