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{{Refimprove|date=December 2008}}
{{Refimprove|date=December 2008}}
{{More footnotes|date=December 2008}}
{{More footnotes|date=December 2008}}
[[Image:Cholecalciferol.png|thumb|[[Cholecalciferol]] (D3)]]
[[Image:Cholecalciferol.svg|thumb|[[Cholecalciferol]] (D3)]]
[[Image:Ergocalciferol.png|thumb|[[Ergocalciferol]] (D2)]]
[[Image:Ergocalciferol.svg|thumb|[[Ergocalciferol]] (D2)]]
[[Image:Trimethyl steroid-nomenclature.png|thumb|right|250px|Steroid skeleton. Note how the "B" ring is broken in Vitamin D.]]
[[Image:Trimethyl steroid-nomenclature.png|thumb|right|250px|Steroid skeleton. Note how the "B" ring is broken in Vitamin D.]]
A '''secosteroid''' is a molecule similar to a [[steroid]] but with a "broken" ring. Etym: L. "SEC-... 'to cut'"<ref>{{cite book|last=Ayers|first=Donald|title=Bioscientific Terminology|year=1972|publisher=University of Arizona Press|location=Tucson|pages=142}}</ref> - "STERE-, 'solid,' 'three dimensional,'"<ref>{{cite book|last=Ibid.,|pages=129}}</ref> -OID "from Gk. -OEIDES, EIDOS 'form.'"<ref>{{cite web|title=Online Etymology Dictionary|url=http://www.etymonline.com/index.php?term=-oid|accessdate=10 May 2012}}</ref>
A '''secosteroid''' is a molecule similar to a [[steroid]] but with a "broken" ring. Etym: L. "SEC-... 'to cut'"<ref>{{cite book|last=Ayers|first=Donald|title=Bioscientific Terminology|year=1972|publisher=University of Arizona Press|location=Tucson|pages=142}}</ref> - "STERE-, 'solid,' 'three dimensional,'"<ref>{{cite book|last=Ibid.,|pages=129}}</ref> -OID "from Gk. -OEIDES, EIDOS 'form.'"<ref>{{cite web|title=Online Etymology Dictionary|url=http://www.etymonline.com/index.php?term=-oid|accessdate=10 May 2012}}</ref>

Revision as of 21:55, 13 February 2013

Cholecalciferol (D3)
Ergocalciferol (D2)
Steroid skeleton. Note how the "B" ring is broken in Vitamin D.

A secosteroid is a molecule similar to a steroid but with a "broken" ring. Etym: L. "SEC-... 'to cut'"[1] - "STERE-, 'solid,' 'three dimensional,'"[2] -OID "from Gk. -OEIDES, EIDOS 'form.'"[3]

Secosteroids are very similar in structure to steroids except that two of the B-ring carbon atoms (C9 and 10) of the typical four steroid rings are not joined, whereas in steroids they are.

In humans, a well known secosteroid is Vitamin D.

References

  1. ^ Ayers, Donald (1972). Bioscientific Terminology. Tucson: University of Arizona Press. p. 142.
  2. ^ Ibid.,. p. 129. {{cite book}}: Missing or empty |title= (help)CS1 maint: extra punctuation (link)
  3. ^ "Online Etymology Dictionary". Retrieved 10 May 2012.


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