Effects of ultraviolet-B radiation on the photosynthesis of seagrasses (Halophila engelmanni Aschers, Halodule wrightii Aschers, and Syringodium filiforme Kütz) were examined. The intrinsic tolerance of each seagrass to ultraviolet-B, the presence and effectiveness of photorepair mechanisms to ultraviolet-B-induced photosynthetic inhibition, and the role of epiphytic growth as a shield from ult...

The association of various personal, occupational, and environmental factors with cataracts and pseudoexfoliation of the lens (PXF) was examined in a group of Australian Aborigines. Cataracts occurred more commonly in the elderly but were also associated with high levels of ultraviolet radiation and sunlight and were more commonly seen in lower latitudes. PXF was also seen more commonly in the ...

Background: Ultraviolet (UV) radiation is divided into three regions: UVA, UVB, and UVC. Both the quality and quantity of solar UV radiation vary with various factors including the elevation of the sun above the horizon, as well as absorption and scattering of UV photons by molecules in the atmosphere, notably ozone and clouds. It is clear that whereas a moderate amount of UV exposure ...