yeast (redirected from Beer yeast)

yeast (yest) a general term including single-celled, usually rounded fungi that produce by budding; some yeasts transform to a mycelial stage under certain environmental conditions, while others remain single-celled. They are fermenters of carbohydrates, and a few are pathogenic for humans.

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bakers' yeast , brewers' yeast Saccharomyces cerevisiae, used in brewing beer, making alcoholic liquors, and baking bread.

dried yeast  dried cells of any suitable strain of Saccharomyces cerevisiae, usually a by-product of the brewing industry; used as a natural source of protein and B-complex vitamins.

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yeast (yst)

n.

1. Any of various unicellular fungi of the genus Saccharomyces, especially S. cerevisiae, reproducing by budding and from ascospores and capable of fermenting carbohydrates.

2. Any of various similar fungi.

3. A commercial preparation in either powdered or compressed form containing yeast cells and inert material and used especially as a leavening agent or as a dietary supplement.

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yeast,

n a general term denoting true fungi of the family
Saccharomycetaceae. Because of their ability to ferment carbohydrates, some yeasts are important to the brewing and baking industries.

Yersinia enterocolitica

n.pl bacteria that causes
Yersinia enterocolitis, contracted from contaminated food or water. Symptoms of infection often mimic acute appendicitis and are most common in children younger than age 7. A sister bacteria,
Y. pestis, was the cause of the historic bubonic plague. From the genus
Yersinia, these motile and nonmotile, non spore-forming bacteria contain gram-negative, unencapsulated, ovoid- to rod-shaped cells. These organisms are parasitic on humans and other animals.

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yeast

a general term including unicellular, nucleated, usually rounded fungi that reproduce by budding; some are fermenters of carbohydrates, and a few are pathogenic for animals. See also mastitis.

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yeast artificial chromosome

cloning vectors developed for the cloning of large (200-500 kbp) DNA fragments; YAC libraries permit the cloning of large genes with their flanking regulatory sequences as well as families of contiguous genes. They are difficult to work with and have the further disadvantage that the cloned sequences are unstably retained.

brewer's yeast

Saccharomyces cerevisiae used in brewing beer, making alcoholic liquors, and baking bread. See also dried yeast (below).

dried yeast

dried cells of any suitable strain of Saccharomyces cerevisiae, usually a by-product of the brewing industry; used as a natural source of protein and B-complex vitamins.

yeast two-hybrid system

an experimental technique for identifying genes whose protein product interacts with another particular protein of interest.

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yeast A unicellular spherical-to-oval 3–5 µm budding fungus that reproduces both sexually and asexually, primarily by budding–some by binary fission which, when adherent in end-to-end rows are termed pseudohyphae; most fungi are saprobes; many are used in commercial fermentation of foods and beverages; 7 genera–class Deuteromycetes–Imperfect Fungi–are human pathogens: Candida, Crytococcus, Geotrichum, Pityrosporum, Rhodotorula, Torulopsis, Trichosporon. See Candida, YAC cloning.