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.

词汇	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	signatories signatory signatum signatural signature signature block signature book signature campaign signature card signatured signature drive signature file signature guarantee signatureless signatures signature song signature strike signature tune signature tunes signaturist signaturize sign away sign behavior ogdoads ogee