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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.
The growth of yeast within food products is often seen on their surfaces, as in cheeses or meats, or by the fermentation of sugars in beverages, such as juices, and semiliquid products, such as syrups and jams. [123] The yeast of the genus Zygosaccharomyces have had a long history as spoilage yeasts within the food industry.
Saccharomyces is a genus of fungi that includes many species of yeasts. Saccharomyces is from Greek σάκχαρον (sugar) and μύκης (fungus) and means sugar fungus.Many members of this genus are considered very important in food production where they are known as brewer's yeast, baker's yeast and sourdough starter among others.
Yeast species of the genus Saccharomyces are also used to produce alcoholic beverages through fermentation. [260] Shoyu koji mold ( Aspergillus oryzae ) is an essential ingredient in brewing shoyu ( soy sauce ) and sake , and the preparation of miso , [ 261 ] while Rhizopus species are used for making tempeh . [ 262 ]
Their robust fermentation characteristics allow growth in wastes from biomass, which is ecologically significant and means that species under the genus can be observed near sites of biomass production. [4] Cyberlindnera have also been isolated from insect frass of coniferous trees [13] and detritus-based mangrove wetlands along the Indian west ...
The yeast can ferment glucose and cellobiose, but not galactose, sucrose, maltose, lactose, raffinose or trehalose. [1] It has a positive growth rate at 37 °C, but there is no growth at 40 °C. [ 1 ] [ 2 ] It can grow on agar media containing 0.1% cycloheximide and 10% sodium but growth on 50% glucose-yeast extract agar is weak. [ 1 ]
Kluyveromyces marxianus in ascomycetous yeast and member of the genus, Kluyveromyces. It is the sexual stage (teleomorph) of Atelosaccharomyces pseudotropicalis [1] also known as Candida kefyr. [2] This species has a homothallic mating system and is often isolated from dairy products. [3]
Saccharomycotina is a subdivision (subphylum) of the division (phylum) Ascomycota in the kingdom Fungi. [2] [3] It comprises most of the ascomycete yeasts.The members of Saccharomycotina reproduce by budding and they do not produce ascocarps (fruiting bodies).