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Cerium oxide nanoparticles, combining antioxidant and UV shielding properties, prevent UV-induced cell damage and mutagenesis

Andrzej Sienkiewicz, Fanny Caputo

Efficient inorganic UV shields, mostly based on refracting TiO2 particles, have dramatically changed the sun exposure habits. Unfortunately, health concerns have emerged from the pro-oxidant photocatalytic effect of UV-irradiated TiO2, which mediates toxic ...

Royal Soc Chemistry2015

Modeling the hydrologic response of snow-dominated Alpine catchments: the role of sunlight exposure

Pierfrancesco Da Ronco

This work investigated how important the explicit modeling of sunlight exposure (aspect, slope) is for discharge simulation in a high alpine catchment. The used spatially-explicit hydrological model includes a simple snow accumulation and melt routine (bas ...

2013

Photo-induced growth of silver nanoparticles using UV sensitivity of cellulose fibers

Arash Alahgholipour Omrani

A simple method has been demonstrated to grow silver nanoparticles on the surface of cellulose fibers. The preparation is based on photo-activation of surface by ultraviolet (UV) photons, followed by chemical reduction of silver nitrate. It is found that t ...

Elsevier2012

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A difunctional cycloaliphatic epoxy monomer was cationically photo-polymerized in the presence of a diaryliodonium salt photoinitiator and an isopropyl thioxanthone photosensitizer at different temperatures and UV intensities. The photo-polymerization kine ...

2012

Nanocomposite materials based on a HBP and silica are produced using either a dual-cure sol/gel and photopolymerization process or by mixing silica nanoparticles with the HBP. In both cases the conversion of the HBP is independent of composition and obeys ...

2012

Stress changes in H2-loaded SMF optical fibers induced by cw-Ar+ 244 nm irradiation

Hans Georg Limberger, Georgios Violakis, Nandita Aggarwal

Bragg gratings were inscribed in H2-loaded SMF-28e optical fibers and measured for axial stress changes for various exposure doses. Mean refractive index changes as high as 7.5 × 10-3 were observed under cw-244 nm irradiation of 143 W/cm2. Bragg grating re ...

Optical Soc Amer2012

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Highly inorganic sol–gel films and patterned surfaces with up to 90% of titania were obtained by hydrolysis and condensation of Titanium(IV) isopropoxide. As a consequence of titania photocatalytic effect, the further treatment of the nanoimprint patterned ...

Elsevier2012

Dopachrome tautomerase (Dct) is a critical enzyme in the melanogenesis pathway that isomerizes the intermediate dopachrome to 5,6-dihydroxyindole-2-carboxylic acid (DHICA) and influences the proportion of DHICA monomer incorporated into the 5,6-dihydroxyin ...

Elsevier2010

Differential roles of the pRb and Arf/p53 pathways in murine naevus and melanoma genesis

Friedrich Beermann

Summary We report on a systematic analysis of genotype-specific melanocyte UVR responses in transgenic mouse melanoma models along with tumour penetrance and comparative histopathology. pRb or p53 pathway mutations cooperated with Nras(Q61K) to transform m ...

2010

Relationship between high daily erythemal UV doses, total ozone, surface albedo and cloudiness: An analysis of 30 years of data from Switzerland and Austria

This work investigates the occurrence frequency of days with high erythemal UV doses at three stations in Switzerland and Austria (Davos, Hoher Sonnblick and Vienna) for the time period 1974-2003. While several earlier studies have reported on increases in ...

Elsevier2010