نتایج جستجو برای: solar radiation ultraviolet vitamin d
تعداد نتایج: 990323 فیلتر نتایج به سال:
Bardenheier et al. (1) presented data on prevalence of gestational diabetes mellitus (GDM) associated with delivery as a function of state and race. They identified a number of important risk factors including race, maternal age, state, insurance, and obesity. Overlooked in the article was any discussion of the role of vitamin D. Vitamin D deficiency is an important risk factor for GDM. A revie...
The formation of fatty acid esters of vitamin D3 was demonstrated in rat skin exposed to artificial ultraviolet rays by using multi-dimensional high-performance liquid chromatography, ultraviolet spectrophotometry, and gas-liquid chromatography-mass spectrometry. This result indicated that the fatty acid esters of 7-dehydrocholesterol in rat skin (at least 80% of 7-dehydrocholesterol in rat ski...
The adequacy of the UV Index (UVI), a simple measure of ambient solar ultraviolet (UV) radiation, has been questioned on the basis of recent scientific data on the importance of vitamin D for human health, the mutagenic capacity of radiation in the UVA wavelength, and limitations in the behavioral impact of the UVI as a public awareness tool. A working group convened by ICNIRP and WHO met to as...
BACKGROUND Geographically, Queensland presents an extreme ultraviolet exposure climate to members of the public engaged in outdoor recreational activity. The risk of developing a skin cancer or an eye disease as a result of incidental exposure to naturally occurring ultraviolet radiation in the outdoor environment is proportionately high in a Queensland population compared with fair-skinned pop...
Vitamin D is primarily recognized for its role in calcium homeostasis. However, recent research has suggested that the functions of vitamin D may be more numerous and complex. This paper is a review of basic physiology of vitamin D, recent research, and how it applies to submarine crews. Epidemiological and cellular research indicate that vitamin D may play a role in autoimmune disorders and ca...
Research Most (90–100%) vitamin D is produced endogenously following solar ultraviolet radiation (UVR) of precursors within sun-exposed skin (Holick 1994). Only a few foods, such as oily fish, contain significant amounts of vitamin D naturally (Holick 1994). Serum 25-hydroxyvitamin D [25(OH)D] is widely recognized as the best measure of vitamin D status (Holick 2004a), and reflects UVR exposure...
An influence of solar irradiance variations on Earth’s surface climate has been repeatedly suggested, based on correlations between solar variability and meteorological variables1. Specifically, weaker westerly winds have been observed in winters with a less active sun, for example at the minimum phase of the 11-year sunspot cycle2–4. With some possible exceptions5,6, it has proved difficult fo...
Vitamin D is essential for bone health and possibly various other health outcomes. It is available following ultraviolet (UV)-B (280-315nm) irradiation of skin, or oral ingestion. Careful sunscreen use of sun protection factors (SPFs) 18-19 during such exposure reduces blood level increases on sunny holidays by up to about 50%, but these increases remain significant. Further, the maintenance of...
BACKGROUND Vitamin D insufficiency during winter is common in the Nordic countries. Heliotherapy (HT) may heal atopic dermatitis (AD) but its effect on vitamin D balance has not been examined. OBJECTIVES To study the effect of HT on serum calcidiol (25-hydroxyvitamin D) concentration and on healing of AD. METHODS Twenty-three adult patients with AD received a 2-week course of HT in the Cana...
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