effects of uv radiation on motility photo
May 30, 2017 · It has been reported that UV-B radiation not only impairs the motility and photo orientation of cyanobacteria but also affects a number of physiological and biochemical processes, such as growth, survival, pigmentation and nitrogen metabolism . Studies have stated that exposure to mild doses of UV-B radiation has induced resistance in some Effect of ultraviolet C irradiation on human sperm Purpose:Ultraviolet C (UVC) irradiation of aqueous solutions is known to be a good source of reactive oxygen species (ROS). The aim of this study is to examine the effect of increasing doses of UVC irradiation, in the presence and absence of the antioxidant butylated hydroxytoluene (BHT), on human sperm motility and lipid peroxidation of its membranes.Materials and methods:Human sperm
Abstract. Ozone is distributed throughout the atmosphere with its highest concentration in the stratosphere between about 1540 km. Both its production and breakdown are powered by solar ultraviolet radiation, though at different wavelengths. Effects of UV-B radiation on growth and motility of four A depletion of the stratospheric ozone layer would result in an increased UV-B radiation, which could have harmful effects on marine organisms. The aim of this study was to determine the effects of an enhanced UV-B radiation (280320 nin) on the motility and Effects of increasing doses of UV-B radiation on Jan 01, 2000 · Effects of increasing doses of UV-B radiation on photosynthetic efficiency (PE) and motility in Chlamydomonas reinhardtii were investigated. The exposure time ranged from 10 to 120 min at 0.73 W/m2 UV-B radiation. A decrease in compensation points (CP) was followed by an increase in PE on extending the UV-B treatment up to 60 min.
UV-B radiation is detrimental to all forms of life, but photosynthetic organisms, including microalgae, are particularly vulnerable due to their obligatory requirement for solar radi-ant energy for photosynthesis, growth and survival. It has been reported that UV-B radiation could alter the morphology, impair motility Ultraviolet-radiation-induced inflammation promotes Intermittent intense ultraviolet (UV) exposure represents an important aetiological factor in the development of malignant melanoma. The ability of UV radiation to cause tumour-initiating DNA mutations in melanocytes is now firmly established, but how the microenvironmental effects of UV radiation influence melanoma pathogenesis is not fully understood. effect of UV-B radiation and humic substances on growth Jan 01, 1993 · Abstract. The effects of ultraviolet-B radiation (UV-B, 250315 nm) were determined on Euglena gracilis with respect to speed, phototactic orientation, specific growth rate, and in the presence of humic substances. Humic substances had a protective effect
- Skin CancerPremature Aging and Other Skin DamageCataracts and Other Eye DamageImmune SuppressionEach year, more new cases of skin cancer are diagnosed in the U.S. than new cases of breast, prostate, lung, and colon cancer combined. One in five Americans will develop skin cancer in their lifetime. One American dies from skin cancer every hour. Unprotected exposure to UV radiation is the most preventable risk factor for skin cancer.EFFECTS OF UV ON POLYCARBONATE GLAZINGThe photo-Fries reaction is promoted by radiation of short wavelengths and does not require oxygen to occur. In the photo-Fries mechanism, the energy absorbed from UV radiation promotes the scission of the carbonate linkage, forming two primary free radicals ( Rivaton 1995). The free radicals then rearrange to form phenyl salicylates and