dehydrocholesterol sentence in Hindi
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- 7-Dehydrocholesterol is the precursor of cholecalciferol.
- Provitamin D 2 is ergosterol, and provitamin D 3 is 7-dehydrocholesterol.
- The first step involves a photochemically induced conrotatory ring opening of 7-dehydrocholesterol to form pre vitamin D3.
- Vitamin D 3 is produced photochemically from 7-dehydrocholesterol in the skin of most vertebrate animals, including humans.
- In animals C5SD catalyzes the dehydration of lathosterol to 7-dehydrocholesterol, a step in the synthesis of cholesterol.
- In 1935, the chemical structure of vitamin D 3 was established and proven to result from the ultraviolet irradiation of 7-dehydrocholesterol.
- At that time there was no synthetic vitamin D, but the dehydrocholesterol in milk can be converted to vitamin D by radiation with ultraviolet light.
- Desmosterol is the immediate precursor of cholesterol in the Bloch pathway of cholesterol biosynthesis . 24-dehydrocholesterol reductase catalyses the reduction of desmosterol to cholesterol.
- :: : : : : : Historically, food only contained the precursor, 7-dehydrocholesterol, which then required exposure to UV light to form vitamin D 3.
- The vitamin D in milk comes either from the cow's milk itself ( the cow also makes cholecalciferol in its skin through the UV activation of 7-dehydrocholesterol ) or from the fortification of the milk with cholecalciferol.
- The precursor of vitamin D 3, 7-dehydrocholesterol is produced in relatively large quantities . 7-Dehydrocholesterol reacts with UVA spectrum, but typically produce 4 % to 10 % of the total UV emissions as UVB ).
- The precursor of vitamin D 3, 7-dehydrocholesterol is produced in relatively large quantities . 7-Dehydrocholesterol reacts with UVA spectrum, but typically produce 4 % to 10 % of the total UV emissions as UVB ).
- Because the newly discovered substance was the fourth vitamin identified, it was called vitamin D . The 1928 Nobel Prize in Chemistry was awarded to Adolf Windaus, who discovered the steroid 7-dehydrocholesterol, the precursor of vitamin D.
- Within the epidermal layer of skin, 7-Dehydrocholesterol undergoes an electrocyclic reaction as a result of UVB radiation, resulting in the opening of the vitamin precursor B-ring through a sigmatropic rearrangement and therein finally isomerizes to form vitamin D 3.
- UVB radiation with a wavelength of 290 315 nanometers penetrates uncovered skin and converts cutaneous 7-dehydrocholesterol to UV intensity and vitamin D synthesis, Individuals with limited sun exposure need to include good sources of vitamin D in their diet or take a supplement.
- However, approximately 10 % may show normal cholesterol levels, and decreased concentrations of cholesterol are not solely indicative of SLOS . Increased levels of cholesterol precursors are also common in SLOS . In particular, elevated levels of 7-dehydrocholesterol are fairly specific to SLOS.
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