Objective: To determine the vitamin D status of middle-aged women living in the Norwegian arctic and its relationship with vitamin D intake and exposure to ultraviolet (UV) radiation. Design: Cross-sectional study. Subjects and setting: This study is based on measurements of 25-hydroxyvitamin D (25(OH)D) levels in a sub-sample of the Norwegian component of the EPIC biological bank, which consis...

Objective: To determine the vitamin D status of middle-aged women living in the Norwegian arctic and its relationship with vitamin D intake and exposure to ultraviolet (UV) radiation. Design: Cross-sectional study. Subjects and setting: This study is based on measurements of 25-hydroxyvitamin D (25(OH)D) levels in a sub-sample of the Norwegian component of the EPIC biological bank, which consis...

Solar transformities were computed for the solar irradiance spectrum at the top of the Earth’s atmosphere, assuming a model in which the sun radiates as a blackbody with a temperature of 6000 K. Conventionally, the solar transformity (ST) of sunlight reaching the surface of the Earth’s atmosphere has been defined as one. Here, the ST of irradiance at the median wavelength, 794 nm, is defined as...

Colonies of Stylophora pistillata maintained for four years in indoor aquaria in the near absence of ultraviolet radiation (UVR) contained only small amounts (,5 nmol mg21 protein) of 10 identified mycosporine-like amino acids (MAAs, which act as UV sunscreens), the largest number reported in any organism. The concentrations of most MAAs increased linearly or exponentially when colonies were ex...

INTRODUCTION Vitamin D is a preprohormone known to play a key role in phosphocalcic metabolism; its main source comes from the synthesis at the skin level by ultraviolet (UV) radiation. OBJECTIVE The purpose of this study was to determine the levels of vitamin D in an Ecuadorian population. MATERIALS AND METHODS Retrospective study of Ecuadorian subjects from the city of Guayaquil, who had ...

Excessive exposure to solar ultraviolet (UV) radiation has damaging effects on life Earth. High-energy short-wavelength B (UVB) is biologically effective, influencing a range of dermal processes, including the potentially beneficial production vitamin D. In addition UVB, longer wavelength and more abundant A (UVA) been shown be linked an increased risk skin cancer. To evaluate this requires mon...

BACKGROUND Cystic fibrosis (CF) and short bowel syndrome (SBS) patients are unable to absorb vitamin D from the diet and thus are frequently found to be severely vitamin D deficient. We evaluated whether a commercial portable ultraviolet (UV) indoor tanning lamp that has a spectral output that mimics natural sunlight could raise circulating 25-hydroxyvitamin D [25(OH)D] levels in subjects with ...

Vitamin D is a fat soluble vitamin that has mainly two types D2 (ergocalciferol) and D3 (cholecalcifererol). While vitamin D can be obtained from dietary sources (D2 isoform) the biggest contribution to an individual’s circulating levels of vitamin D, in most countries, is through endogenous production in the skin following exposure to ultraviolet(UV)-B radiation from the sun. Exposure to UV-B ...