Definition of dehydrocholesterol in English:

dehydrocholesterol

noundiːˌhʌɪdrə(ʊ)kəˈlɛstərɒldēˌhīdrōkəˈləstərôl

mass nounBiochemistry

A derivative of cholesterol present in the skin. It can be converted to cholecalciferol (vitamin D₃) by the action of ultraviolet radiation.
〔生化〕脱氢胆甾醇，脱氢胆固醇
Chemical formula: C₂₇H₄₄O
Example sentencesExamples
- The most important source of vitamin D for all individuals is the sunlight-driven conversion in skin of 7 - dehydrocholesterol to cholecalciferol.
- Since 7 - dehydrocholesterol is present in the skin in large quantities and only needs sunlight to be activated, vitamin D is often called the ‘sunshine vitamin.’
- High energy ultraviolet light enters the skin and causes the photochemical conversion of 7 - dehydrocholesterol to previtamin D 3, which at body temperature undergoes isomerization to vitamin D 3.
- In the skin 7 - dehydrocholesterol is converted to cholecalciferol following UV irradiation.
- Other types of UV dosimeters are based on the photodamage of DNA in spores, bacteria or bacteriophages or the conversion of 7 - dehydrocholesterol to previtamin D.

Origin

1930s: from dehydro- 'that has lost hydrogen' + cholesterol.

Definition of dehydrocholesterol in US English:

dehydrocholesterol

noundēˌhīdrōkəˈləstərôl

Biochemistry

A derivative of cholesterol present in the skin. It can be converted to cholecalciferol (vitamin D₃) by the action of ultraviolet radiation.
〔生化〕脱氢胆甾醇，脱氢胆固醇
Chemical formula: C₂₇H₄₄O. The particular isomer involved in vitamin D₃ formation is 7-dehydrocholesterol
Example sentencesExamples
- Other types of UV dosimeters are based on the photodamage of DNA in spores, bacteria or bacteriophages or the conversion of 7 - dehydrocholesterol to previtamin D.
- In the skin 7 - dehydrocholesterol is converted to cholecalciferol following UV irradiation.
- Since 7 - dehydrocholesterol is present in the skin in large quantities and only needs sunlight to be activated, vitamin D is often called the ‘sunshine vitamin.’
- The most important source of vitamin D for all individuals is the sunlight-driven conversion in skin of 7 - dehydrocholesterol to cholecalciferol.
- High energy ultraviolet light enters the skin and causes the photochemical conversion of 7 - dehydrocholesterol to previtamin D 3, which at body temperature undergoes isomerization to vitamin D 3.

Origin

1930s: from dehydro- ‘that has lost hydrogen’ + cholesterol.

单词	dehydrocholesterol
释义	Definition of dehydrocholesterol in English: dehydrocholesterol noundiːˌhʌɪdrə(ʊ)kəˈlɛstərɒldēˌhīdrōkəˈləstərôl mass nounBiochemistry A derivative of cholesterol present in the skin. It can be converted to cholecalciferol (vitamin D₃) by the action of ultraviolet radiation. 〔生化〕脱氢胆甾醇，脱氢胆固醇 Chemical formula: C₂₇H₄₄O Example sentencesExamples The most important source of vitamin D for all individuals is the sunlight-driven conversion in skin of 7 - dehydrocholesterol to cholecalciferol. Since 7 - dehydrocholesterol is present in the skin in large quantities and only needs sunlight to be activated, vitamin D is often called the ‘sunshine vitamin.’ High energy ultraviolet light enters the skin and causes the photochemical conversion of 7 - dehydrocholesterol to previtamin D 3, which at body temperature undergoes isomerization to vitamin D 3. In the skin 7 - dehydrocholesterol is converted to cholecalciferol following UV irradiation. Other types of UV dosimeters are based on the photodamage of DNA in spores, bacteria or bacteriophages or the conversion of 7 - dehydrocholesterol to previtamin D. Origin 1930s: from dehydro- 'that has lost hydrogen' + cholesterol. Definition of dehydrocholesterol in US English: dehydrocholesterol noundēˌhīdrōkəˈləstərôl Biochemistry A derivative of cholesterol present in the skin. It can be converted to cholecalciferol (vitamin D₃) by the action of ultraviolet radiation. 〔生化〕脱氢胆甾醇，脱氢胆固醇 Chemical formula: C₂₇H₄₄O. The particular isomer involved in vitamin D₃ formation is 7-dehydrocholesterol Example sentencesExamples Other types of UV dosimeters are based on the photodamage of DNA in spores, bacteria or bacteriophages or the conversion of 7 - dehydrocholesterol to previtamin D. In the skin 7 - dehydrocholesterol is converted to cholecalciferol following UV irradiation. Since 7 - dehydrocholesterol is present in the skin in large quantities and only needs sunlight to be activated, vitamin D is often called the ‘sunshine vitamin.’ The most important source of vitamin D for all individuals is the sunlight-driven conversion in skin of 7 - dehydrocholesterol to cholecalciferol. High energy ultraviolet light enters the skin and causes the photochemical conversion of 7 - dehydrocholesterol to previtamin D 3, which at body temperature undergoes isomerization to vitamin D 3. Origin 1930s: from dehydro- ‘that has lost hydrogen’ + cholesterol.
随便看	christian doctrine christian doppler Christian era box kite box-like box-like box-like box lunch box lunches box number box numbers box office box-office hit box offices box-office success box of tricks box of tricks boxout box pew box pleat box plot box room box sb in box sb's ears box score