Ring Structure of Calciferol
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چکیده
منابع مشابه
Studies on Calciferol Metabolism
The administration of cholecalciferol (vitamin D3) (CC) to rachitic chicks results in the production of two major polar metabolites, 25-hydroxycholecalciferol (25-OH-CC) and 1,25-dihydroxycholecalciferol (1,25-diOH-CC), and a number of other minor metabolites. Eighteen hours after a physiological dose (0.65 mnoles) of radioactive cholecalciferol, 80% of the radioactivity in the target intestine...
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In the present work, we investigate the tunability of the magnetic response of a new structure. A lattice of periodically arranged close-packed square conducting rings has been studied for this purpose. Here, instead of enhancing the magnetic activity via resonance, like in split-ring resonators, we concentrate on the analysis of the interactions between these rings. The core idea is to design ...
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the zero-divisor graph of a commutative ring r with respect to nilpotent elements is a simple undirected graph $gamma_n^*(r)$ with vertex set z_n(r)*, and two vertices x and y are adjacent if and only if xy is nilpotent and xy is nonzero, where z_n(r)={x in r: xy is nilpotent, for some y in r^*}. in this paper, we investigate the basic properties of $gamma_n^*(r)$. we discuss when it will be eu...
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Arnstein, H. R. V. & Simkin, J. L. (1959). Nature, Lond., 183, 523. Baker, H., Frank, 0., Pasher, I., Hutner, S. H., Herbert, V. & Sobotka, H. (1959). Proc. Soc. exp. Biol., N.Y., 100, 825. Barker, H. A., Weissbach, H. & Smyth, R. D. (1958). Proc. nat. Acad. Sci., Wa8h., 44, 1093. Brink, N. G., Wolf, D. E., Kaczka, E., Rickes, E. L., Koniuszy, F. R., Wood, T. R. & Folkers, K. (1949). J. Amer. c...
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The 2-desoxy-ribose nucleosides, first isolated by Levene and London’ by the hydrolysis of thymus nucleic acid, are characterized by their extreme ease of hydrolysis by very dilute mineral acids. Thus, guanine-2-desoxy-riboside is completely hydrolyzed by heating with 0.01 N hydrochloric acid during 5 minutes. Since the rate of hydrolysis is of the same order as that of the furanosides, it was ...
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ژورنال
عنوان ژورنال: Nature
سال: 1935
ISSN: 0028-0836,1476-4687
DOI: 10.1038/1351072a0