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Yeasts are single-celled (unicellular) fungi, a few species of which are commonly used to leaven bread, ferment alcoholic beverages, and even drive experimental fuel cells. Most yeasts belong to the division Ascomycota, though some are Basidiomycota. A few yeasts, such as Candida albicans, can cause infection in humans (Candidiasis). More than one thousand species of yeasts have been described. The most commonly used yeast is Saccharomyces cerevisiae, which was domesticated for wine, bread, and beer production thousands of years ago.
Physiology
Yeast species can have either obligately aerobic or facultatively anaerobic physiology. There is no known obligately anaerobic yeast. In the absence of oxygen, fermentative yeasts produce their energy by converting carbohydrates into carbon dioxide and ethanol (alcohol) or lactic acid. In brewing, the ethanol is bottled, while in baking the carbon dioxide raises the bread, and the ethanol evaporates.
An example with glucose as the substrate is
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For average quality white grapes, use high ester forming yeasts and ferment as cool as possible, 13-15oC (56-59oF)
wineyeast (wine yeast online) Thu, 24 Dec 2009 07:21:35 -0000
For average quality white grapes, use high ester forming yeasts and ferment as cool as possible, 13-15oC (56-59oF)
Wonder how Faulkner would have liked Twitter- he would have had a field day w/ screwcaps, copper fining, extract'n enzymes & cultured yeasts
JohnBGilman (John B Gilman) Thu, 24 Dec 2009 03:08:37 -0000
Wonder how Faulkner would have liked Twitter- he would have had a field day w/ screwcaps, copper fining, extract'n enzymes & cultured yeasts
@vinifico but fermenting with selected yeasts is hardly cookie-cutter. Only option for many. @JustGrapesWine @Bradinator @paulrickett
Yaffler (Mark Shipway) Thu, 24 Dec 2009 02:27:36 -0000
@vinifico but fermenting with selected yeasts is hardly cookie-cutter. Only option for many. @JustGrapesWine @Bradinator @paulrickett
Went to Princeton Homebrew in Trenton, NJ. Nice selection of malt, adjuncts, hops and yeasts. http://beeradvocate.com/beer/profile/2868
ksignal9 (Signal9) Wed, 23 Dec 2009 22:44:12 -0000
Went to Princeton Homebrew in Trenton, NJ. Nice selection of malt, adjuncts, hops and yeasts. http://beeradvocate.com/beer/profile/2868
@alawine Does Sonoma's Coturri count as natural? They don't add yeasts. The wines are made the way G-d intends it.
louismgreen (Louis Green) Tue, 22 Dec 2009 23:32:14 -0000
@alawine Does Sonoma's Coturri count as natural? They don't add yeasts. The wines are made the way G-d intends it.
@allagashbeer mmmm... spontaneous air borne yeasts with raspberries... how might one get their hands on said bottle?
mhokie (mhokie) Tue, 22 Dec 2009 01:59:56 -0000
@allagashbeer mmmm... spontaneous air borne yeasts with raspberries... how might one get their hands on said bottle?
Crown Yeast Company Ltd. - Manufacturers of instant and active dried baking yeast for the bakery trade; exported worldwide.
Lallemand - Canadian based producer of yeast and bacteria serving international baking, wine, brewing, food, agriculture, human nutrition and pharmaceutical industries.
Meta Description: [ content ]
Lesaffre Yeast - Producers of yeast, yeast extracts, malt and a variety of bioconversions for the food and animal feed industry.
Meta Description: [ Production of baker's yeast in all its forms: compressed, dried or liquid ]
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Levapan - Specializes in yeast extracts and canned preserves. Company history, products and distribution details.
Meta Description: [ 5-mar-03 ]
Springer - Offers a wide range of yeast products for food flavouring, fermentation, health foods, and wine making.
Meta Description: [ Le Monde Produits de Levure, Home, Ceci n'est qu'un test pour vérifier que tout fonctionne bien. ]
Turbo Yeast - Offers extremely alcohol-tolerant yeast and complex nutrients that quickly ferment mash into alcohol.
Meta Description: [ Turbo Yeast for distilleries.Turbo is comprised of a mix of very alcohol tolerant yeast and complex nutrients that quickly ferment a pure sugar solution into alcohol. There are two types of Turbos: one making 14% - 16% alcohol and one making 18% - 20% alcohol.
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White Labs - Manufactures liquid yeast for brewers. Includes recipes, yeast database, newsletter, homebrewer information and links, FAQ, and testimonials.
Meta Description: [ White Labs is a world leader in fermentation sciences for the brewing and winemaking industries. We manufacture liquid yeast for professional and amateur brewers and winemakers. Find out why professionals all over the globe use our yeast. ]
Wyeast Laboratories, Inc. - Produces yeast for beer and wine making. Products, FAQ, company history and information about yeast.
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