In vitro evaluation of the efficacy of commercial green tea extracts in UV protection.

Plants with antioxidant properties are beneficial for preventing the ageing events evoked by UV light, and numerous products based on Camellila sinensis (green tea) are commercially available, many of which claiming to contain bioactive compounds that would prevent UV-induced skin damage. In this study, we tested the efficacy of five commercial green tea extracts used to enrich cosmetic formulations for protecting human and mouse fibroblasts against UV radiation effects and compared with a fluid one prepared according to the Brazilian Pharmacopoeia recommendations. Taking into consideration that the ageing process can be accelerated by solar radiation by excessive free radical generation, leading to depletion of skin antioxidant defences, and its collapse caused by disruption of the metalloproteinase metabolism, we have used their individual (-)-epigallocathechin-3-gallate (EGCG) content, the catalase and SOD status and the matrix-degrading metalloproteases (MMP)-1, MMP-9 and MMP-13 levels as comparative parameters.

Temporal resolution in children: comparing normal hearing, conductive hearing loss and auditory processing disorder.

Unlabelled: Temporal resolution is essential to speech acoustic perception. It may be altered in subjects with auditory disorders, thus impairing the development of spoken and written language.

Aim: The goal was to compare temporal resolution of children with normal hearing, with those bearing conductive hearing loss and auditory processing disorders.