نتایج جستجو برای: ultraviolet radiation
تعداد نتایج: 268436 فیلتر نتایج به سال:
Photochemical damage either to retinoids by near-ultraviolet radiation or to unsaturated fatty acids by near-ultraviolet radiation in the presence of a hydrophobic photosensitizer destroys the virucidal activities of the compounds, as determined by studies on the enveloped bacteriophage ø6.
Antioxidant capabilities of scoparone, the component of Artemisia scoparia and other medicinal plants, against lipid peroxidation induced by ultraviolet radiation or Fenton reaction have been analyzed. Lipid peroxidation was monitored by measuring the absorption spectra of the conjugated dienes and quantified by the Klein oxidation index. Obtained results imply that scoparone is a very efficien...
A new source-based radiometry beamline was recently constructed at the Synchrotron Ultraviolet Radiation Facility (SURF III). The goal of this beamline is to establish a national source standard with a wide spectral range from the far ultraviolet to the infrared by using the calculability of SURF III. The new beamline is a straight-through white-light beamline with few, if any, optical componen...
Malignant melanoma of the skin (CMM) is associated with ultraviolet radiation exposure, but the mechanisms and even the wavelengths responsible are unclear. Here we use a mammalian model to investigate melanoma formed in response to precise spectrally defined ultraviolet wavelengths and biologically relevant doses. We show that melanoma induction by ultraviolet A (320-400 nm) requires the prese...
The advantages and disadvantages of sources emitting either a continuous or a discontinuous spectrum are considered in connection with the use of such lamps as a standard of ultraviolet radiation. It is shown that because of the high intensity and favorable distribution of the ultraviolet emission lines at 2967 to 3132 A, the quartz mercury-arc lamp is well adapted for standardizing photoelectr...
Squamous cell carcinoma (SCC) of the skin is one of the mostcommon non melanoma skin cancers (NMSC), along withbasal cell carcinoma (BCC). Besides ultraviolet radiation,exposure to industrial agents, ionizing radiation, and areas ofchronic inflammation are associated with the development ofSCC. Squamous cell carcinoma may also be associated withforeign bodies. We report a rare case of cutaneous...
چکیده ندارد.
background: despite their simplicity and the low-cost, the conventional non-contact uv systems have low efficiency in water disinfection. the purpose of this study was to examine the possibility of upgrading these systems by some modifications in order to maximize the water contact with the uv radiation and as a result a better disinfection. methods: in this study, two enhanced models of non...
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