Fell, Jack W. Division of Marine Biology and Fisheries, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Key Biscayne, Florida.
Phaff, Herman J. Department of Food Science and Technology, College of Agricultural and Environmental Sciences, University of California, Davis, California.
Walker, Graeme M. School of Molecular and Life Sciences, University of Abertay Dundee, Dundee, United Kingdom.
Last reviewed:October 2016
Show previous versions
- Sexual reproduction
- Food spoilage
- Industrial yeast
- Pharmaceutical products
- Links to Primary Literature
- Additional Readings
A collective name for those fungi that possess, under normal growth conditions, a vegetative body (thallus) consisting, at least in part, of simple, single cells. Yeasts are a phylogenetically diverse group of organisms that occur in two divisions or phyla of fungi, namely, Ascomycota and Basidiomycota. More than 1500 species have been described, but these possibly represent only 1% of the total number of species in nature; thus, the majority of yeasts have yet to be discovered. Yeasts play a large part in industrial fermentation processes, including the production of industrial enzymes and chemicals, food products, industrial ethanol, and malt beverages and wine; in diseases of humans, animals, and plants; in food spoilage; and as a model of molecular genetics (for example, Schizosaccharomyces pombe is a notable model organism; Fig. 1). In yeast, the cells making up the thallus occur in pairs, in groups of three, or in straight or branched chains consisting of as many as 12 or more cells. Vegetative reproduction is characterized by budding or fission. Sexual reproduction also occurs in yeast, and it is differentiated from that of other fungi by sexual states that are not enclosed in a fruiting body. See also: Distilled spirits; Fermentation; Food fermentation; Fungi; Malt beverage; Mycology; Wine; Yeast systematics
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Its dedicated editorial team is led by Sagan Award winner John Rennie. Contributors include more than 9000 highly qualified scientists and 39 Nobel Prize winners.
MORE THAN 8500 articles and Research Reviews covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 17,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information