Results 191 to 200 of about 65,192 (231)

Serum 25-Hydroxyvitamin D in Infantile Rickets

Pediatrics, 1976
In small children with nutritional vitamin D deficiency, the serum concentration of 25-hydroxyvitamin D (25-OH-D), the major circulating metabolite of vitamin D, was correlated with the stage of clinical disease. It was low (16 to 20 ng/ml) but within the normal range in the earliest (hypocalcemic) stage of the deficiency syndrome and decreased (& ...
S B, Arnaud, G B, Stickler, J C, Haworth
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25-Hydroxyvitamin D

Archives of Internal Medicine, 1978
During the first three days of life newborns exhibit a decrease in serum ionized calcium level (Ca ++ ). 1 A pathological exacerbation of this process may occur in premature infants, infants born to mothers who are diabetic, and sick infants of any gestational age who were asphyxiated and required active resuscitation.
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Serum 25-hydroxyvitamin D in erythropoietic protoporphyria

British Journal of Dermatology, 2008
Vitamin D, produced by the action of sunlight on skin, is an important hormone for calcium homeostasis and has been implicated as tumour-protective agent. Some previous studies of photosensitive patients who actively avoid sunlight have failed to show convincing evidence of vitamin D insufficiency.The aim of this study was to characterize the vitamin D
S A, Holme, A V, Anstey, M N, Badminton, G H, Elder   +3 more
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25-Hydroxyvitamin D, cholesterol, and ultraviolet irradiation

Metabolism, 2008
Vitamin D deficiency may have implications for cardiovascular health. The purpose of this study was to determine the relationship of 25-hydroxyvitamin D (25[OH]D) to cholesterol and lipoprotein particles and to determine whether increasing 25(OH)D through ultraviolet (UV) irradiation impacted on these parameters in healthy young men and women. This was
Laura D, Carbone, E William, Rosenberg, Elizabeth A, Tolley, Michael F, Holick, Thomas A, Hughes, Mitchell A, Watsky, Karen D, Barrow, Tai C, Chen, Nathaniel K, Wilkin, Syamal K, Bhattacharya, John C, Dowdy, Robert M, Sayre, Karl T, Weber   +12 more
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25-Hydroxyvitamin D Levels and Rickets

Pediatrics, 1977
The article by Arnaud et al. (Pediatrics 57:221, February 1976) compared the serum concentration of 25-hydroxyvitamin D to the changes in long bones as assessed by x-ray films, concluding that the serum concentration of 25-hydroxyvitamin D correlated with the stage of clinical disease in patients with nutritional rickets.
Joseph Giangiacomo, Wallace A. Gleason
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3-Epi-25 hydroxyvitamin D in pregnancy

Pregnancy Hypertension: An International Journal of Women's Cardiovascular Health, 2014
The physiological importance of the C3 epimers of vitamin D (3-epi-25OHD2/3) is uncertain and there have been limited studies determining the levels of these epimers in human populations. The aims of the current study were (1) to determine 3-epi-25OHD2/3 levels throughout non-diabetic and T1DM pregnancy, (2) to examine the relationships between 25OHD ...
S E, Bennett, C, Casey, J, McPeake, D R, McCance, J G, Manderson, A, McGinty   +5 more
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25-Hydroxyvitamin D isomerizes to pre-25-hydroxyvitamin D in solution: considerations for calibration in clinical measurements

Analytical and Bioanalytical Chemistry, 2015
Reference standards for the vitamin D metabolites 25-hydroxyvitamin D3, 25-hydroxyvitamin D2, and 3-epi-25-hydroxyvitamin D3 were evaluated using liquid chromatography (LC) with ultraviolet (UV) absorbance and mass spectrometric (MS) detection to assess purity.
Mary, Bedner, Katrice A, Lippa
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[Study of circulating 25 hydroxyvitamin D].

Revue du rhumatisme et des maladies osteo-articulaires, 1976
The levels of circulating 25 OH-D were determined by a direct radio-competition methods both in normal subjects and in subjects with various pathological conditions. In normal subjects, the average level of 25 OH-D was higher in summer (42.3 ng/ml) than in winter (29.1 ng/ml), P less than 0.005.
J C, Renier, M, Bernat, A, Rebel, P, Jallet   +3 more
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Serum 25‐Hydroxyvitamin D Levels in Congenital Craniotabes

Acta Paediatrica, 1988
Dosage du taux de 25-OHD dans le serum du cordon mixte arterio-veineux de 22 bebes a terme ayant un craniotabes et dans le serum de leur mere; dosage de Ca, P et des phosphatases alcalines dans les serums mere-enfant. Le craniotabes congenital est apparu dans certains cas associe a un etat limite des reserves de vitamine D materno ...
S, Reif, Y, Katzir, Z, Eisenberg, Y, Weisman   +3 more
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The 25-Hydroxyvitamin D 24-Hydroxylase

2005
This chapter reviews the role of 25-hydroxyvitamin D 24-hydroxylase in vitamin D metabolism. The 24-hydroxylase enzyme is a widely distributed component of the vitamin D pathway. It is regulated by a spectrum of hormones and functions to synthesise 24-hydroxylated metabolites, with preferential action in promoting bone mineralization and possibly other
Omdahl, John L., May, B.
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