Exposure to the UV solar irradiance reaching the ground has an important impact on human health, vegetable growth and the degradation processes of several materials. As a first step of a larger project aiming to characterize ...

This paper describes statistical and climatic analyses of G, UV, PAR and NIR irradiations, and UV/G, PAR/G and NIR/G fractions using a data base obtained from 2001 to 2005 in Botucatu/SP/Brazil. Values of irradiations and ...

Photoautotrophs can cope with an increase in ultraviolet (UV) irradiance in the aquatic environment, through protection and acclimation mechanisms (i.e. synthesis of UV-absorbing compounds). This capacity has been proven ...

Background: Topical flavonoids, such as quercetin, have been shown to reduce ultraviolet (UV) irradiation-mediated skin damage. However, the mechanisms and signaling pathways involved in this protective effect are not ...

Background: The transmission of healthcare-associated pathogens is mainly related to the massive flow of patients with infections in hospitals, presenting surfaces as potential transmission sources of these microorganisms. ...

Santiago de Chile (33°27' S-70°41' W) is a mid-latitude city of 6 million inhabitants with a complicated surrounding topography. Aerosol extinction in Santiago is determined by the semi-arid local climate, the urban ...

A comparison of the catalytic activity of the copper-modified magnetite was carried out under different conditions (dark and irradiated) and irradiation systems (460 nm Vis-LED, 370 nm UV-LED and Solar) in the degradation ...

Measurements of spectral and multichannel UV radiation became more common in the middle and late eighties after the discovery of the ‘‘ozone hole,’’ but time series for these measurements are still relatively short for the ...

• Here, the link between UV-B stimulus and the abscisic acid (ABA)-induced nitric oxide (NO) synthesis pathway was studied in leaves of maize (Zea mays). • The ABA concentration increased by 100% in UV-B irradiated leaves. ...