نتایج جستجو برای: ultraviolet protection
تعداد نتایج: 219057 فیلتر نتایج به سال:
Background Protection of bioreactors from viruses and mycoplasma remains a challenge. While the risk of these contaminations is known, and several recent high profile cases have raised awareness of this risk, many bioreactors remain unprotected. Currently available technologies, such as high-temperature short-time treatment and ultraviolet light treatment, can be difficult to implement due to f...
Rofecoxib is a selective cyclooxygenase COX-2 enzyme inhibitor with chemoprotective effect against cancer in experimental models. This study aimed to investigate the effect of rofecoxib against ctds DNA damage induced by copper ions or ultraviolet (UV)B radiation. Aliquot ctdsDNA samples were incubated with copper sulfate solution (50 nmol) and rofecoxib (0.8 mol) was added either before or aft...
Background: Silymarin, a flavonoid with antioxidant activities and extracted from milk thistle (Silybum marianum), previously used for its liver protection activity has been recently tested for dermatologic disorders Objectives: Our purpose was to summerize all the dermatologic oriented in vitro and in vivo experiments and clinical trials on silymarin. Methods: A systematic review of the litera...
Carotenoids are efficient antioxidants that are of great importance for human health. Lutein and zeaxanthin are carotinoids present in high concentrations in the human retina which are involved in the photoprotection of the human eye. Lutein may also protect the skin from ultraviolet (UV)-induced damage. The present study investigated the protective effect of lutein extracted from yellow silk c...
Exposure to ultraviolet B radiation in sunlight provides the mechanism for more than 90% of the vitamin D production in most individuals. Concern has been expressed in recent years that the widespread use of sunscreens, particularly those with high sun protection factors, may lead to a significant decrease in solar-induced previtamin D(3) in the skin, resulting in a vitamin D level which is con...
This study aimed to determine whether there have been shifts in news coverage of sun protection issues over a 12-year period in the context of an evolving skin cancer prevention agenda. A content analysis was performed on all relevant articles (N = 552) published in the two metropolitan daily newspapers in Melbourne, Australia, from 2001 to 2012. Coding variables included theme, article type, p...
Concern over stratospheric ozone depletion has prompted several government agencies in North America to establish networks of spectroradiometers for monitoring solar ultraviolet irradiance at the surface of the Earth. To assess the ability of spectroradiometers to accurately measure solar ultraviolet irradiance, and to compare the results between instruments of different monitoring networks, th...
Skin cancer is the most common form of cancer; the World Health Organization estimates that more than 2 million cases of skin cancer are being diagnosed each year worldwide. Excessive sun exposure and ultraviolet (UV) radiation are the major avoidable risk factors for skin cancer, including melanoma. Sun protection can be achieved through behavioral modification, social changes and environmenta...
This study aimed to investigate the incorporation of rutin into electrospun pullulan and poly(vinyl alcohol) (PVA) nanofibers to obtain ultraviolet (UV)-resistant properties. The effect of weight ratios between pullulan and PVA, and the addition of rutin on the nanofibers' morphology and diameters were studied and characterized by scanning electron microscopy (SEM). Fourier transform infrared (...
OBJECTIVE Outdoor workers have high levels of exposure to ultraviolet radiation and the associated increased risk of skin cancer. This paper describes a review of: 1) descriptive data about outdoor workers' sun exposure and protection and related knowledge, attitudes, and policies and 2) evidence about the effectiveness of skin cancer prevention interventions in outdoor workplaces. DATA SOURC...
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