Vitamina D (Calciferol
) in Biodisponibilidade de Nutrientes.
A precursor of vitamin D, 7-dehydrocholesterol, is naturally present in the human skin; it is transformed to calciferol
by the action of ultraviolet light, and this compound is metabolized in the liver and kidney to active vitamin D (1, 25 dihydrocholecalciferol) itself.
ergosterol [approaches] calciferol
, [D.sub.2]) and pregnenolone derivatives and, therefore, can be useful starting materials for various sex steroids and corticosteroids.
The presence of dietary factors could partly explain the discrepancy in the results: the low levels of circulating 1,25(OH)2D are found mainly in the North European population which, in contrast to the American population, rarely consumes milk containing supplementary calciferol
Treatment of lupus vulgaris with Calciferol
. Lancet 1946;1(6408):919-22.
Lupus Vulgaris Treated with Calciferol
. Proceedings of the Royal Society of Medicine 1945; 39(2):96.
Sin embargo, solamente el calciferol
(vitamina [D.sub.3]), tiene efecto apreciable a la prevencion del raquitismo en las gallinas (9).
Cod liver oil and calciferol
, major sources of vitamin D, have been used since the 17th century to treat patients with tuberculosis .
that reported "all-trans retinoic acid [an activated form of vitamin A] antagonizes the action of calciferol
[activated vitamin D] and its active metabolite, 1, 25-dihydroxycholecalciferol, in rats." In a January 2010 rebuttal to the commentary, Linda Linday, MD, and colleagues point out that Rohde's research used very high vitamin A:D ratios.
Phytase, citric acid, and 1[alpha]-hydroxychole- calciferol
improve phytate phosphorus utilization in chicks fed a corn-soybean meal diet.
was used to treat tuberculosis in the late 1940s and treatment was rationalised based on its role in the calcification of tuberculosis lesions.