from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A crystalline sterol, C28H43OH, synthesized by yeast from sugars or derived from ergot and converted to vitamin D2 when exposed to ultraviolet radiation.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The steroid precursor of vitamin D2. It is found in cell membranes of fungi, and is their functional equivalent of cholesterol. It is also found in the membranes of some protists.
from the GNU version of the Collaborative International Dictionary of English
- n. a plant sterol that is converted into vitamin D by ultraviolet radiation.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a plant sterol that is converted into vitamin D by ultraviolet radiation
In addition, and especially important to its effectiveness as a remedy for ulcers and running sores, it is a rich source of ergosterol, which is converted by the sun's ultraviolet rays into vitamin D.
" And Amanda would answer, "The label states that this carton contains activated ergosterol.
Jimmy, I'm not sure about this activated ergosterol.
Have you ever heard of a cow that activated ergosterol?
The research carried out in recent years, in which Windaus himself has also played a leading part, has revealed the very important fact that, on being irradiated with ultraviolet light, this ergosterol assumes exactly the same properties as the antirachitic vitamin, "vitamin D", i.e. it will cure rachitis
For example, it has been found that 5 mg of irradiated ergosterol has the same action in this respect as 1 litre of good cod-liver oil.
It can be considered proved, therefore, that ergosterol, or possibly a sterol, the physiological effects of which correspond completely with those of ergosterol, constitutes the antirachitic provitamin, i.e. the mother substance of vitamin
Another sterol which Windaus has studied in detail, is ergosterol, which occurs partly in ergot and partly in yeast.
Figure 4: Genetic interactions with ergosterol biosynthetic genes.
POPC-based vesicles containing PE (PC + PE), PS (PC + PS), SM (PC + SM) or ergosterol (PC + Erg) for 30 min.