tachysterol

[tah-kis´ter-ol] an isomer of ergosterol, an antirachitic substance, produced by irradiation of ergosterol.

ta·chys·ter·ol

(tă-kis'tĕr-ōl), Sterol(s) formed by ultraviolet irradiation of any 5,7-diene-3β-sterol, which breaks the 9,10 bond, but usually from either or both of ergosterol and lumisterol to produce tachysterol₂ (ertacalciol, (6E,22E)-9,10-secoergosta-5(10),6,8,22-tetraen-3β-ol) and from 7-dehydrocholesterol to produce tachysterol₃ (tacalciol, (6E,3S)-9,10-secocholesta-5(10),6,8-trien-3β-ol). When reduced to the 5,7-diene (or 5,7,22-triene) form, dihydrotachysterol₃ (10,19-dihydrocalciol) or dihydrotachysterol₂ (10,19-dihydroercalciol), antirachitic action appears. This property has been of therapeutic interest, but tachysterol is being replaced by the true vitamin D hormone (calcitriol) and its derivatives.

tachysterol

(tə-kĭs′tə-rôl′, -rōl′)n. An isomer of ergosterol that forms vitamin D₂ when irradiated with ultraviolet light.

ta·chys·ter·ol

(tak-is'tĕr-ol) Sterol(s) formed by ultraviolet irradiation of any 5,7-diene-3β-sterol. When it is reduced to the 5,7-diene (or 5,7,22-triene) form, antirachitic action appears.

单词	tachysterol
释义	tachysterol ta·chys·ter·ol T0008250 (tə-kĭs′tə-rôl′, -rōl′)n. An inactive compound, C₂₈H₄₄O, that is formed by irradiation of a precursor of vitamin D₃ and can be converted back into that precursor. tachysterol tachysterol [tə′kis·tə‚rȯl] (biochemistry) The precursor of calciferol in the irradiation of ergosterol; an isomer of ergosterol. tachysterol tachysterol [tah-kis´ter-ol] an isomer of ergosterol, an antirachitic substance, produced by irradiation of ergosterol. ta·chys·ter·ol (tă-kis'tĕr-ōl), Sterol(s) formed by ultraviolet irradiation of any 5,7-diene-3β-sterol, which breaks the 9,10 bond, but usually from either or both of ergosterol and lumisterol to produce tachysterol₂ (ertacalciol, (6E,22E)-9,10-secoergosta-5(10),6,8,22-tetraen-3β-ol) and from 7-dehydrocholesterol to produce tachysterol₃ (tacalciol, (6E,3S)-9,10-secocholesta-5(10),6,8-trien-3β-ol). When reduced to the 5,7-diene (or 5,7,22-triene) form, dihydrotachysterol₃ (10,19-dihydrocalciol) or dihydrotachysterol₂ (10,19-dihydroercalciol), antirachitic action appears. This property has been of therapeutic interest, but tachysterol is being replaced by the true vitamin D hormone (calcitriol) and its derivatives. tachysterol (tə-kĭs′tə-rôl′, -rōl′)n. An isomer of ergosterol that forms vitamin D₂ when irradiated with ultraviolet light. ta·chys·ter·ol (tak-is'tĕr-ol) Sterol(s) formed by ultraviolet irradiation of any 5,7-diene-3β-sterol. When it is reduced to the 5,7-diene (or 5,7,22-triene) form, antirachitic action appears.
随便看	uganda export promotion board uganda federal democratic front uganda fish processors and exporters association uganda floricultural association uganda food security initiative uganda forest sector policy and strategy project uganda gender rights foundation uganda honey bee-keepers association uganda human rights association uganda human rights education and documentation centre uganda independence day uganda institute of organic farming uganda joint assistance strategy uganda liberation day uganda library and information association uganda local authorities association uganda manufacturers' association uganda martyrs day uganda medical workers union uganda ministry of health uganda muslim women vision ugandan uganda national association for nurses and midwives uganda national banana research program uganda national bureau of standards