Chronic exposure to environmental ultraviolet radiation (UVR) plays a key role both in photocarcinogenesis and induction of accelerated skin ageing. Sailors commonly experience a significant number of cutaneous problems, related to the exposure to environmental factors due to their working conditions. Among these factors, sun exposure is able to determine both acute and chronic skin damage, mos...

Solar ultraviolet radiation (UVR) can reduce the photosynthesis and growth of benthic diatom communities in shallow freshwater. Nevertheless, greater amounts of algae accumulate in UVR-exposed habitats than in UVR-protected environments. Near-ultraviolet (UVA wavelengths of 320 to 400 nanometers) and mid-ultraviolet (UVB, wavelengths of 280 to 320 nanometers) radiation also inhibit algal consum...

Chem. Abstr. Serv. Reg. No.: 298-81-7 Chem. Abstr. Name: 9-Methoxy-7Hfuro[3,2-g][1]benzopyran-7-one IUPAC Systematic Name: 9-Methoxyfuro[3,2-g]chromen-7-one Synonyms: 5-Benzofuranacrylic acid, 6-hydroxy-7-methoxy-, δ-lactone; Meladinine; 8-methoxy-6,7-furanocoumarin; 8-methoxypsoralen; 8-methoxy[furano3′,2′:6,7-coumarin]; 8-MOP; 8-MP; Oxsoralen; Puvasoralen; Uvadex Description: Silky needles or...

Chem. Abstr. Serv. Reg. No.: 298-81-7 Chem. Abstr. Name: 9-Methoxy-7Hfuro[3,2-g][1]benzopyran-7-one IUPAC Systematic Name: 9-Methoxyfuro[3,2-g]chromen-7-one Synonyms: 5-Benzofuranacrylic acid, 6-hydroxy-7-methoxy-, δ-lactone; Meladinine; 8-methoxy-6,7-furanocoumarin; 8-methoxypsoralen; 8-methoxy[furano3′,2′:6,7-coumarin]; 8-MOP; 8-MP; Oxsoralen; Puvasoralen; Uvadex Description: Silky needles or...

Introduction The evolution of most forms of life has occurred in an environment exposed to the ultraviolet (UV) and visible radiation emanating from the sun. When molecules in living cells absorb photons in this region of the electromagnetic spectrum they are promoted to excited electronic states and this process can have profound biological consequences. In general, visible wavelengths (400-78...

I review the nature of the diffuse cosmic ultraviolet background radiation. The ultraviolet background is the last frontier: all the other diffuse backgrounds have been examined, at least at some level. The ultraviolet background has only begun to be explored; it offers rich promise of new astrophysical knowledge.

Moderate exposure to ultraviolet radiation (UVR) from the sun is a necessary part of maintaining normal health. Ultraviolet radiation is critical for formation of VitaminD and the normal healthy growth of bones and teeth. However, excessive exposure to UVR has no health benefits and can lead to adverse consequences for the skin and eye. When the body receives excessive UVR exposure on a chronic...

Polchinski has argued that the prediction of Hawking radiation must be independent of the details of unknown high-energy physics because the calculation may be performed using ‘nice slices’, for which the adiabatic theorem may be used. If this is so, then any calculation using a manifestly covariant — and so slice-independent — ultraviolet regularization must reproduce the standard Hawking resu...

Stratospheric ozone depletion and the concomitant increase in irradiance of ultraviolet-B radiation (UVB) at the earth’s surface represent major threats to terrestrial and aquatic ecosystems. In costal rocky shore environments, seaweeds constitute a group of organisms of particular significance to ecosystem function. Thus, impairment of seaweed performance by UVB-exposure may result in severe c...