《脂溶性维生素Fatsolublevitamins》由会员分享，可在线阅读，更多相关《脂溶性维生素Fatsolublevitamins（21页珍藏版）》请在金锄头文库上搜索。
1、脂溶性维生素（Fat soluble vitamins）Daiwenzi500 assistant small two | news (2) | | I know my Encyclopedia | Baidu home page | exitNews page bar, know MP3 pictures, videos, encyclopedia LibraryHelp setHome, natural, cultural, geographical, historical, social, artistic, character, economic, scientific, sports
2、, dream of the Red ChamberThe Champions LeagueCore userFat soluble vitaminsDefinition of scientific and technical termsFat soluble vitamins lipid-soluble vitamin; fat-soluble vitamin definition: dissolved in organic solvents and insoluble in water of a class of vitamins. Vitamin A, vitamin D, vitami
3、n E and vitamin K are included. Subjects: biochemistry and Molecular Biology (first level discipline), hormones and vitamins (two disciplines)This content is examined and approved by the national science and technology term examination and Approval Committeemedical aircraftFat soluble vitaminsA comp
4、ound consisting of a long hydrocarbon chain or dense ring. Fat soluble vitamins, including vitamin A, D, E and K, all contain a ring structure and a long, aliphatic hydrocarbon chain, although each of these four vitamins has at least one polar group but is highly hydrophobic. Certain fat soluble vit
5、amins are not precursors of coenzyme, and can be used by organisms without chemical modification. This kind of vitamin can be stored by animals.Catalogbrief introductionClassification introductionEdit this paragraphbrief introductionEnglish translationLipid soluble vitaminEdit this paragraphClassifi
6、cation introductionVitamin AVitamin A, also known as anti dry eye alcohol, there are two kinds of A1 and A2, A1 is retinol, A2 is 3-, retinol dehydrogenase, activity is half of the former. The liver is the place where vitamin A is stored.Carotenoids in plants are precursors of VA, a beta carotene mo
7、lecule that catalyzes the addition of two molecules of water to one oxidase and breaks down into two molecules, VA1. This process is carried out in the small intestine mucosa. Carotenoids also include alpha carotene, gamma carotene, lycopene, lutein, etc. the first three kinds of water add a molecul
8、e VA1, and the latter two do not produce VA1.Vitamin A is associated with dark vision. Under the action of vitamin A in alcohol dehydrogenase into retinaldehyde, 11- CIS retinal and opsin lysine amino composed of rhodopsin rhodopsin in the light decomposition into trans retinal and opsin, secretly r
9、e synthesis, forming a visual cycle. Vitamin A deficiency can lead to visual impairment that dark night blindness. Edible liver and green vegetables can be treated. Trans - trans trans - retinoic acid is mainly converted into 11- cis - yellow in the liver. Therefore, Chinese medicine thinks that the
10、 liver is connected with the eye.Vitamin A has a lot of uses, but it is difficult to study because animals lacking vitamin A are susceptible to infection. Steroid hormones are known to decrease in the absence of vitamin A because vitamin A is required for its one-step hydroxylation to the precursor
11、synthesis. In addition, the lack of vitamin A reduces the number of epidermal cells and increases the number of keratinocytes. Some people think that because vitamin A is related to cell division and differentiation, some people think that vitamin A is related to the synthesis of mucopolysaccharide
12、and glycoprotein and can be used as a monosaccharide carrier. Vitamin A is also associated with transferrin synthesis, immunity, antioxidant, and so on.Vitamin A can promote the proliferation and growth of cells, protect the integrity and health of the epithelial tissue of all organs, and maintain n
13、ormal vision. Can promote the growth of young raccoons, the normal skeletal development and increase of various infectious disease resistance, the formation is also involved in sex hormones, improve the reproductive ability. Lack of vitamin A, can cause young raccoons growth stagnation, skin and muc
14、ous epithelium seriously horny, seriously affecting fertility, and fur quality, more content in animal feed in vitamin A, such as fish, fish, whales scrap liver, dairy, eggs etc. Raccoon dog every day for the supply of 8001000 international units, in the supplementation of vitamin A at the same time
15、, the appropriate increase of fat and vitamin E, can improve the utilization rate of the base.Excessive intake of vitamin A can cause poisoning, can cause pain, hepatosplenomegaly, nausea and diarrhea and other symptoms of squamous dermatitis. Large consumption of polar bear liver or halibut liver c
16、an cause poisoning.Vitamin DVitamin D, also known as calcium alcohol and anti rickets vitamins, is a steroid derivative, containing cyclopentane, multi hydrogen, phenanthrene structure. Can be taken directly, but also by the original vitamin D by ultraviolet radiation transformation. Vegetable oil and yeast ergosterol into D2 (ergocalciferol), 7- dehydrocholesterol animal
