Yeast
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[[Image:Scerevisiae.jpg|thumb|250px|Electron micrograph of [[Saccharomyces cerevisiae]] (Baker's yeast)]] | [[Image:Scerevisiae.jpg|thumb|250px|Electron micrograph of [[Saccharomyces cerevisiae]] (Baker's yeast)]] | ||
| - | Yeast can survive in places with or without oxygen. It can be found in breads dough or while preparing the flour mixtures and other wine products. Only few | + | Yeast can survive in places with or without oxygen. It can be found in breads dough or while preparing the flour mixtures and other wine products. Only few wine use natural yeast from Grapes to ferment their wines. But now wines depend on pure culture yeasts to help make their wines. Overall they are in many of our foods and drinks that we put into our body. [http://www.diamondv.com/articles/booklet/booklet.html] |
There are many different kinds of yeast grown for nutritional purposes. The first kind of yeast is the Primary Dried Yeast it is propagated on sugar substrates, it is dried at a high temperature so it killed the yeast cells inside, then sold to food industries. Another kind of yeast is Brewers Dried Yeast after the beer is fermented the yeast is also dried at a high temperature to kill the yeast cells then sold for food products. Third kind of yeast is Torula Dried Yeast it is grown on waste water, which is called sulfite liquor in other terms then feed to the market industrys for foods. The fourth kind of yeast is Whey Yeast it is made on whey lactose from Kluyveromyces marxianus, whey yeast became a big problem so it was stopped, but then it stared to appear in food ingridients after a while. Last kind of yeast is the Whole Yeasts it contains proteins, peptides, vitamins, and minerals in the cell. [http://www.diamondv.com/articles/booklet/booklet.html] | There are many different kinds of yeast grown for nutritional purposes. The first kind of yeast is the Primary Dried Yeast it is propagated on sugar substrates, it is dried at a high temperature so it killed the yeast cells inside, then sold to food industries. Another kind of yeast is Brewers Dried Yeast after the beer is fermented the yeast is also dried at a high temperature to kill the yeast cells then sold for food products. Third kind of yeast is Torula Dried Yeast it is grown on waste water, which is called sulfite liquor in other terms then feed to the market industrys for foods. The fourth kind of yeast is Whey Yeast it is made on whey lactose from Kluyveromyces marxianus, whey yeast became a big problem so it was stopped, but then it stared to appear in food ingridients after a while. Last kind of yeast is the Whole Yeasts it contains proteins, peptides, vitamins, and minerals in the cell. [http://www.diamondv.com/articles/booklet/booklet.html] | ||
Revision as of 09:51, 4 March 2009
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| Yeast |
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| Scientific Classification |
| Phyla |
Contents |
Introduction
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Anatomy
Yeasts is part of the kingdom fungi which has mushrooms, mildews, molds, and eukaryotes. There are about 1,500 species of yeast, it can measure up to 3 to 7 micrometers and some can reach up to 40. You can find Yeasts mostly in sugar- rich places, so like flower nectars and fruit surfaces. Yeasts is ability to fermant sugar made them a big part of the human world, such as baking bread and making alchohol beverages, this is from the yeast species called Saccharomyces cerevisiae. Yeast of unicellular organisms and is divided into two divisions of fungi called Ascomycotina and Basidiomycotina, and a 100 genera. Yeast can become a string formantion connected by the budding cells called pseudohyphae, or seen in most molds called true hyphae. They reproduce asexually by budding and rely on the surroundings to survive. They also somewhat help our ecosystem as decomposers, and to humans. It has been known that there are many similarities between yeast cells and the human cells. Like the yeast homologues is a counter part for the human gene. [1]
Mostly Yeasts area found in fructose sugar or fruits like grapes, apples, and peaches, it it also found in some plants like plant saps or cacti. It is involved in some soils and insects. [2]
Yeast is also feed to animals in froms of mash or other by- products form. They are fungi a single cell organism which is about 5 to 10 inches in size. There are about 50,000 species of fungi, but only 60 different kinds of yeast relating to 500 different species of yeast. Yeast is all over the environment it can also be found in silages, hays, grain by-products, also sometimes found in soil and water. [3]
Reproduction
Yeast is a common mode it is a asexual reproduction of budding or fission. In fission the yeast parents divides into two equal cells which causes fission. Yeast mostly reproduce with budding, which is when a bud or protrusion, which is the daughter cell made by the parent cell. Parent cell of the nucleus is divided into a daugter nucleus and is made to a daughter cell. Bud will keep on growing till it sepreates from the parent cell forming a new cell. [4]
Some yeast species are reproduce sexual reproductive cycles. The Yeast cells can be ethier diploids which means has homologous one sets of chromosomes or it can be haploids which will contain two sets of chromosomes. Yeast cells will die if it is under high stress conditions or nutrient depletion. Mating of Yeasts happens thru haploids, which is the a or alpha depending on the difference. [5]
Yeast clones can produce by budding when the environmental times are good. Even when stressful times Yeasts can lay dormant till the surroundings of the area get better. The Yeast involves asexual budding and it is dependent to its surroundings of conditions. Yeasts really usually likes the different temperatures and acidity. It really thrives in warm moist places and low in carbon dioxide and high in oxygen. [6]
Ecology
Yeast can survive in places with or without oxygen. It can be found in breads dough or while preparing the flour mixtures and other wine products. Only few wine use natural yeast from Grapes to ferment their wines. But now wines depend on pure culture yeasts to help make their wines. Overall they are in many of our foods and drinks that we put into our body. [7]
There are many different kinds of yeast grown for nutritional purposes. The first kind of yeast is the Primary Dried Yeast it is propagated on sugar substrates, it is dried at a high temperature so it killed the yeast cells inside, then sold to food industries. Another kind of yeast is Brewers Dried Yeast after the beer is fermented the yeast is also dried at a high temperature to kill the yeast cells then sold for food products. Third kind of yeast is Torula Dried Yeast it is grown on waste water, which is called sulfite liquor in other terms then feed to the market industrys for foods. The fourth kind of yeast is Whey Yeast it is made on whey lactose from Kluyveromyces marxianus, whey yeast became a big problem so it was stopped, but then it stared to appear in food ingridients after a while. Last kind of yeast is the Whole Yeasts it contains proteins, peptides, vitamins, and minerals in the cell. [8]
Yeast can be found in many places with lots of sugar like in fruits such as apple, peaches, grapes. Also it is involved in many beer and wine products. You can find them in many different breads and in doughs of the bread. [9]
Uses in Foods and Nutritions
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References
- Yeast Multiple Authors. Multiple Publishers.
- Yeast- Life cycle Multiple Authors. Carolina Biological Supply./Phototake NYC.
- [http://www.diamondv.com/articles/booklet/booklet.html Yeast Products in the Feed Industry
A Practical Guide for Feed Professionals] Multiple Author. Multiple Publisher.
- Yeast Multiple Authors. Multiple Publishers.
See Also
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