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https://www.readbyqxmd.com/read/28105477/the-role-of-tachysterol-in-vitamin-d-photosynthesis-a-non-adiabatic-molecular-dynamics-study
#1
Cecilia Cisneros, Travis Thompson, Noel Baluyot, Adam C Smith, Enrico Tapavicza
To investigate the role of tachysterol in the photophysical/photochemical regulation of vitamin D photosynthesis, we studied its electronic absorption properties and excited state dynamics using time-dependent density functional theory (TDDFT), second-order approximate coupled cluster theory (CC2), and non-adiabatic surface hopping molecular dynamics in the gas phase. In excellent agreement with experiments, the simulated electronic spectrum shows a broad absorption band with a remarkably higher extinction coefficient than the other vitamin D photoisomers provitamin D, lumisterol, and previtamin D...
January 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28092390/asthma-comparing-the-impact-of-vitamin-d-versus-uvr-on-clinical-and-immune-parameters
#2
Kylie A Morgan, Elizabeth H Mann, Antony R Young, Catherine M Hawrylowicz
The incidence of asthma has increased markedly since the 1960s and is currently estimated to affect more than 300 million individuals worldwide. A number of environmental factors are implicated in asthma pathogenesis, one of which is vitamin D. Vitamin D deficiency is a global health concern and has increased in parallel with asthma incidence. Epidemiological studies report associations between low vitamin D status, assessed as circulating levels of 25-hydroxyvitamin D, with asthma incidence, severity, exacerbations and responses to treatment...
January 16, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28088200/vitamin-d-status-among-the-elderly-chinese-population-a-cross-sectional-analysis-of-the-2010-2013-china-national-nutrition-and-health-survey-cnnhs
#3
Jing Chen, Chunfeng Yun, Yuna He, Jianhua Piao, Lichen Yang, Xiaoguang Yang
BACKGROUND: Vitamin D inadequacy is common among the elderly, especially within the Asian population. The vitamin D status among healthy adults in the elderly Chinese population was evaluated. METHODS: A total of 6014 healthy adults aged 60 years or older (2948 men, 3066 women) participated in this descriptive cross-sectional analysis. Possible predictors of vitamin D inadequacy were evaluated via multiple logistic regression analyses. RESULTS: The median serum 25-hydroxyvitamin D (25(OH)D) levels were 61...
January 14, 2017: Nutrition Journal
https://www.readbyqxmd.com/read/28078842/remission-effect-of-vitamin-c-on-isoflurane-induced-apoptosis-and-its-mechanism
#4
J Hu, B F Gao, H Q Li, Z Z Zhang, Y L Lei, G Q Sun, D M Guo
This study aims to discuss the remission effect of vitamin C on isoflurane-induced apoptosis of rats and its possible mechanism of action, to provide a theoretical basis for postoperative cognitive impairment. Reactive oxygen species (ROS) detection, adenosine triphosphate (ATP) test, MTT method and Morris water maze were applied for detection tests. For data statistics, double factor analysis of variance (ANOVA) and post hoc Bonferroni test were adopted. It was found that vitamin C could slow down the isoflurane-induced accumulation of ROS in H4-APP cells; moreover, it could relieve the activation of caspase-3 and increase cell survival rate to inhibit the occurrence of apoptosis, indicating that ROS was the source of cell toxicity...
October 2016: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28068803/annals-express-artifactual-25-oh-vitamin-d-level-in-multiple-myeloma
#5
Michal Wen Sheue Ong, Rashim Salota, Tracy Reeman, Lapsley Marta, Lydia Jones
The most commonly used techniques to measure vitamin D are automated immunoassays which are known to be affected by interferences, especially from immunoglobulins present in the patient's serum. We present a case of a patient with myeloma in whom interference with the vitamin D assay was identified. An eighty-three year old female, known to have IgG myeloma was found to have a high concentration of 25-OH vitamin D on a routine test without any signs of vitamin D toxicity. She was not taking vitamin D supplements or any other multivitamin preparation and had minimal sun exposure...
January 1, 2017: Annals of Clinical Biochemistry
https://www.readbyqxmd.com/read/28053375/prevalence-of-vitamin-d-deficiency-in-orthopaedic-patients-a-single-centre-study
#6
C P Pal, Harendra Kumar, Deepak Kumar, Vivek Mittal, Gaurav Deshwar, Danish Altaf, Sushant Verma
PURPOSE: Many recent reports demonstrated high rates of vitamin D deficiency in numerous segments of Indian population but no study has been reported so far from India, which focuses specifically on vitamin D status in orthopaedic patients. This study finds out the prevalence of vitamin D deficiency in orthopaedic patients in India. METHODS: Vitamin D levels of 1132 patients were measured from OPD and Emergency Department of S.N. Medical College, Agra from 1 November 2011 to 31 October 2013...
October 2016: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/28052885/a-micronutrient-fortified-young-child-formula-improves-the-iron-and-vitamin-d-status-of-healthy-young-european-children-a-randomized-double-blind-controlled-trial
#7
Marjolijn D Akkermans, Simone Rbm Eussen, Judith M van der Horst-Graat, Ruurd M van Elburg, Johannes B van Goudoever, Frank Brus
BACKGROUND: Iron deficiency (ID) and vitamin D deficiency (VDD) are common among young European children because of low dietary intakes and low compliance to vitamin D supplementation policies. Milk is a common drink for young European children. Studies evaluating the effect of milk fortification on iron and vitamin D status in these children are scarce. OBJECTIVE: We aimed to investigate the effect of a micronutrient-fortified young-child formula (YCF) on the iron and vitamin D status of young European children...
January 4, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28042676/vitamin-d-insufficiency-in-the-first-6-months-of-infancy-and-challenge-proven-ige-mediated-food-allergy-at-1-year-of-age-a-case-cohort-study
#8
John Molloy, Jennifer J Koplin, Katrina J Allen, Mimi L K Tang, Fiona Collier, John B Carlin, Richard Saffery, David Burgner, Sarath Ranganathan, Terence Dwyer, Alister C Ward, Margarita Moreno-Betancur, Michael Clarke, Anne Louise Ponsonby, Peter Vuillermin
BACKGROUND: Ecological evidence suggests vitamin D insufficiency (VDI) due to lower ambient ultraviolet radiation (UVR) exposure may be a risk factor for IgE-mediated food allergy. However there are no studies relating directly measured VDI during early infancy to subsequent challenge-proven food allergy. OBJECTIVE: To prospectively investigate the association between VDI during infancy and challenge-proven food allergy at 1 year. METHODS: In a birth cohort (n=1074), we used a case-cohort design to compare 25-hydroxy-vitamin-D3 (25(OH)D3 ) levels among infants with food allergy versus a random subcohort (n=274)...
January 2, 2017: Allergy
https://www.readbyqxmd.com/read/28035222/serum-vitamin-d-level-the-effect-on-the-clinical-course-of-psoriasis
#9
Beata Bergler-Czop, Ligia Brzezińska-Wcisło
INTRODUCTION: Psoriasis is a hyperproliferative disorder of the skin, and vitamin D analogs are widely used in its treatment. It is evident that ultraviolet radiation enables vitamin D3 (cholecalciferol) formation in the epidermis, and this product is further converted into the active metabolites 25-hydroxycholecalciferol and 1,25-hydroxycholecalciferol, which exert several important effects on the skin. The disruption in proper functioning of the skin which occurs in psoriasis leads to a loss of capacity for cutaneous synthesis of vitamin D3...
December 2016: Postȩpy Dermatologii i Alergologii
https://www.readbyqxmd.com/read/28031546/sunlight-exposure-and-vitamin-d-status-in-breastfed-infants
#10
Pinky Meena, Aashima Dabas, Dheeraj Shah, Rajeev Kumar Malhotra, S V Madhu, Piyush Gupta
OBJECTIVE: To correlate the sunlight exposure in first 6 months to vitamin D status at 6 months of age in predominantly breastfed infants; and to quantify the sunlight exposure required to achieve serum 25(OH)D level > 20 ng/mL, by 6 months of age. DESIGN: Prospective cohort. SETTING: Tertiary care hospital predominantly catering to urban poor population in Delhi. PARTICIPANTS: 132 healthy infants, delivered at term, and predominantly breastfed were enrolled at 6-8 weeks of age...
December 5, 2016: Indian Pediatrics
https://www.readbyqxmd.com/read/28028727/vitamin-d-deficiency-in-older-adults-and-its-associated-factors-a-cross-sectional-analysis-of-the-mexican-health-and-aging-study
#11
María Fernanda Carrillo-Vega, Carmen García-Peña, Luis Miguel Gutiérrez-Robledo, Mario Ulises Pérez-Zepeda
: Vitamin D deficiency was common in older adults from a country with adequate sun exposure. The variables associated with this deficiency provide insight into the next steps needed to characterize older adults with this deficiency and to treat it accordingly. PURPOSE: The aim of this study was to describe the prevalence of and factors associated with vitamin D deficiency among Mexican older adults. METHODS: This was a secondary analysis of the last wave of the Mexican Health and Aging Study...
December 2017: Archives of Osteoporosis
https://www.readbyqxmd.com/read/28027627/association-of-vitamin-d-deficiency-with-cardiovascular-disease-risk-in-children-implications-for-the-asia-pacific-region
#12
Indah K Murni, Dian C Sulistyoningrum, Vicka Oktaria
BACKGROUND AND OBJECTIVES: Vitamin D deficiency significantly affects cardiovascular disease risk. Cardiovascular disease is epidemic in nature. Because the prevalence of cardiovascular disease has been increasing in children, it has been changing from an adulthood disease to a childhood disease. Therefore, formulating an effective prevention strategy against cardiovascular disease development in children is crucial. METHODS AND STUDY DESIGN: From PubMed, we identified and reviewed studies evaluating the association of vitamin D deficiency with cardiovascular disease risk in children...
December 2016: Asia Pacific Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28009891/ultraviolet-radiation-vitamin-d-and-the-development-of-obesity-metabolic-syndrome-and-type-2-diabetes
#13
Shelley Gorman, Robyn M Lucas, Aidan Allen-Hall, Naomi Fleury, Martin Feelisch
Obesity is increasing in prevalence in many countries around the world. Its causes have been traditionally ascribed to a model where energy intake exceeds energy consumption. Reduced energy output in the form of exercise is associated with less sun exposure as many of these activities occur outdoors. This review explores the potential for ultraviolet radiation (UVR), derived from sun exposure, to affect the development of obesity and two of its metabolic co-morbidities, type-2 diabetes and metabolic syndrome...
December 23, 2016: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28002326/treatment-of-a-long-acting-anticoagulant-rodenticide-poisoning-cohort-with-vitamin-k1-during-the-maintenance-period
#14
Jianhai Long, Xiaobo Peng, Yuan Luo, Yawei Sun, Guodong Lin, Yongan Wang, Zewu Qiu
Currently, there are few guidelines for the use of vitamin K1 in the maintenance treatment of long-acting anticoagulant rodenticide (LAAR) poisonings. We explored factors in the treatment of LAAR poisoning during the maintenance period in order to suggest feasible treatment models.Data from 24 cases of anticoagulant rodenticide poisoning in our hospital were collected from January 2013 to May 2016. The patients' sex, age, coagulation function, total time from poisoning to treatment with vitamin K1 (prehospital time), vitamin K1 sustained treatment time (VKSTT), anticoagulant rodenticide category, and specific poison dosage were collected...
December 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27999341/exploring-the-role-of-vitamin-d-comments-on-fleury-et-al-sun-exposure-and-its-effects-on-human-health-mechanisms-through-which-sun-exposure-could-reduce-the-risk-of-developing-obesity-and-cardiometabolic-dysfunction-int-j-environ-res-public-health-2016-13-999
#15
https://www.readbyqxmd.com/read/27995834/environmental-and-genetic-factors-influence-the-vitamin-d-content-of-cows-milk
#16
R R Weir, J J Strain, M Johnston, C Lowis, A M Fearon, S Stewart, L K Pourshahidi
Vitamin D is obtained by cattle from the diet and from skin production via UVB exposure from sunlight. The vitamin D status of the cow impacts the vitamin D content of the milk produced, much like human breast milk, with seasonal variation in the vitamin D content of milk well documented. Factors such as changes in husbandry practices therefore have the potential to impact the vitamin D content of milk. For example, a shift to year-round housing from traditional practices of cattle being out to graze during the summer months and housed during the winter only, minimises exposure to the sun and has been shown to negatively influence the vitamin D content of the milk produced...
December 20, 2016: Proceedings of the Nutrition Society
https://www.readbyqxmd.com/read/27993879/a-rapid-and-simple-liquid-chromatography-tandem-mass-spectrometry-method-for-measuring-25-hydroxyvitamin-d2-and-25-hydroxyvitamin-d3-in-human-serum-comparison-with-two-automated-immunoassays
#17
COMPARATIVE STUDY
Sanghoo Lee, Joo-Hoon Kim, Seol-A Kim, Yeoun-Soo Sun, Anna Lee, Seo-Jin Park, Yun-Tae Kim, Kyoung-Ryul Lee, Young-Jin Kim
BACKGROUND: Total 25-hydroxyvitamin D (25(OH)D) is well-known to be a reliable biomarker of human vitamin D status, with the recognition of widespread vitamin D insufficiency in general populations. The aims of this study are to validate a fast and simple liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for quantifying 25(OH)D2 and 25(OH)D3 in serum and to compare two automated immunoassays with the LC-MS/MS method. METHODS: Samples were prepared by protein precipitation with ethanol including 25(OH)D3-d6, followed by a liquid-liquid extraction with hexane...
December 2016: Annals of Clinical and Laboratory Science
https://www.readbyqxmd.com/read/27989262/sun-exposure-uv-irradiance-and-serum-25-hydroxycholecalciferol-in-pregnant-women-in-rural-north-india
#18
Siddhnath Sudhanshu, Pramod Upadhyay, Monashish Sahu, Vinita Rawat, Vijayalakshmi Bhatia
OBJECTIVE: To document the effect of season and environmental pollution on UVB irradiance; and to estimate cutaneous vitamin D synthesis in village women in different seasons. DESIGN: Radiant UVB energy was measured by a spectroradiometer in different seasons and, in April and May, on successive days in open areas at the city outskirts, at a crowded inner-city area and the villages of our participants. Clothing, outdoor activity pattern and serum 25-hydroxycholecalciferol (25(OH)D) levels were documented...
December 19, 2016: Public Health Nutrition
https://www.readbyqxmd.com/read/27973470/nutritional-rickets-vitamin-d-calcium-and-the-genetic-make-up
#19
Mohamed El Kholy, Heba Elsedfy, Monica Fernández-Cancio, Rasha Tarif Hamza, Nermine Hussein Amr, Alaa Youssef Ahmed, Nadin Nabil Toaima, Laura Audí
BACKGROUND: The prevalence of vitamin D (vitD) deficiency presenting as rickets is increasing worldwide. Insufficient sun exposure, vitD administration, and/or calcium intake are the main causes. However, vitD system-related genes may also have a role. METHODS: Prospective study: 109 rachitic children completed a 6-mo study period or until rachitic manifestations disappeared. Thirty children were selected as controls. Clinical and biochemical data were evaluated at baseline in patients and controls and biochemistry re-evaluated at radiological healing...
December 14, 2016: Pediatric Research
https://www.readbyqxmd.com/read/27942349/the-risks-and-benefits-of-sun-exposure-2016
#20
REVIEW
David G Hoel, Marianne Berwick, Frank R de Gruijl, Michael F Holick
Public health authorities in the United States are recommending that men, women and children reduce their exposure to sunlight, based on concerns that this exposure will promote skin cancer. On the other hand, data show that increasing numbers of Americans suffer from vitamin D deficiencies and serious health problems caused by insufficient sun exposure. The body of science concerning the benefits of moderate sun exposure is growing rapidly, and is causing a different perception of sun/UV as it relates to human health...
January 2016: Dermato-endocrinology
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