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Saccharomyces pastorianus is a yeast used industrially for the production of lager beer, and was named in honour of Louis Pasteur by the German Max Reess in 1870. [1] This yeast's complicated genome appears to be the result of hybridisation between two pure species in the Saccharomyces species complex, a factor that led to difficulty in establishing a proper taxonomy of the species.
It is malt extract medium modified by the addition of yeast extract and peptone. [2] The 'YM' of the name stands either for 'Yeast and Mold', or 'Yeast extract-Malt extract' depending on the source. Variations include YMG agar/broth, which contains yeast, malt, and glucose. [3]
The National Collection of Yeast Cultures (NCYC) is a British yeast culture collection based at the Norwich Research Park in Norwich, Norfolk, United Kingdom, that currently maintains a collection of over 4400 strains and operates under the Budapest Treaty.
The use of active dry yeasts reduces the variety of strains that appear in spontaneous fermentation by outcompeting those strains that are naturally present. [9] The addition of cultured yeast normally occurs with the yeast first in a dried or "inactive" state and is reactivated in warm water or diluted grape juice prior to being added to the must.
Beers brewed in the United States utilize yeast and bacteria strains instead of or in addition to standard brewers yeasts. These microflora may be cultured or acquired spontaneously, and the beer may be fermented in a number of different types of brewing vessels.
Saccharomyces cerevisiae (/ ˌ s ɛr ə ˈ v ɪ s i. iː /) (brewer's yeast or baker's yeast) is a species of yeast (single-celled fungal microorganisms). The species has been instrumental in winemaking, baking, and brewing since ancient times. It is believed to have been originally isolated from the skin of grapes.
Y187 is a strain of yeast (Saccharomyces cerevisiae) used in biological research for two-hybrid screening.The strain has been sold commercially by Clontech [1] since at least 2000 and is used as a partner with strain AH109 in mating assays.
This mutant yeast strain can be made to incorporate foreign DNA in the form of plasmids. In yeast two-hybrid screening, separate bait and prey plasmids are simultaneously introduced into the mutant yeast strain or a mating strategy is used to get both plasmids in one host cell. [9] The second high-throughput approach is the library screening ...