Vitamin D2, also called ergocalciferol, is found naturally in mushrooms that have been exposed to the sun. Mushrooms contain a yeast compound called ergosterol, which is converted to ergocalciferol on exposure to UV light. Maitake mushrooms are one of the best sources of vitamin D2 at 786 IU...
Vitamin (维生素) D is called "sunshine vitamin," and it is very important to health, yet more Americans are not getting enough, U.S. researchers said on Monday. Researchers found that 75 percent of Americans can't reach the levels of vitamin D, up from about 50 percent of them 20 year...
This dihydroxylated product, also-called calcitriol, is now known to be the active form of vitamin D. Sign in to download full-size image FIGURE 1. Structures of ergosterol and cholecalciferol. The next major breakthrough in vitamin D research was the discovery of high-affinity receptors for ...
Researcher Heike Bischoff-Ferrari wrote in the report.”it is possible for people to increase the amount of vitamin D earlier to keep healthy.” 1.Why Vitamin D is called“sunshine vitamin”? A.Because it is like sunshine B.Because people can get vitamin D in the sun. C.Because it is ...
23.2 Chemistry and Photochemistry of Provitamin and Vitamin D There are at least two kinds of vitamin D (also called calcif- erol), i.e. vitamin D2 (ergocalciferol) and vitamin D3 (cho- lecalciferol), with slightly different structures (Fig. 23.2). The reason that there is no vitamin ...
答题点在第四段提到的“Vitamin D might protect against multiple sclerosis,also called MS.”故此句表达的应该是“维他命D含量高的人们得硬化症的机率会较低。”故选择B)rates“几率”。 结果四 题目 In recent years, researches have suggested more health value from vitamin D than had once been thought...
Anti-inflammatory and antioxidant actions of vitamin D at lung level Lung epithelial cells have high expression of the 1-α-hydroxylase enzyme, which allows local synthesis of 1,25-dihydroxyvitamin D, the most active form of vitamin D, also called calcitriol. Calcitriol inhibits the production and...
the skin. It will become vitamin D3 after irradiated by the light. It is also called cholecalciferol. D2 and D3 have similar structures. They are B ring derivatives of precursors of the sterol. The difference is that the side chain of vitamin D2 has a methyl group and one double bond...
Besides getting vitamin D through sunlight, you can also get it through certain foods and supplements to ensure adequate levels of the vitamin in your blood.【小题1】Why is Vitamin D sometimes called “Sunshine Vitamin”?A.Because it is produced in your skin reacting to sunlight.B.Because it...
(e.g., vitamin D is added to milk). Loss of vitamins may also occur when food is cooked; for instance, heat destroys vitamin A, and water-soluble vitamins may be extracted from food towaterand lost. Certain vitamins (e.g., B vitamins,vitamin K) can be synthesized by microorganisms ...