Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"ultraviolet B radiation"”.
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The Effects of Ultraviolet-B Radiation on Aquatic Invertebrates
… in stratospheric ozone have led to increased ultraviolet-B radiation at the surface of the Earth. However, surprisingly little is known about the effects of UV-B radiation on aquatic ecosystems. The purpose of this study was to assess the sensitivity of aquatic invertebrates to UV-B radiation. …
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Investigating the interactive effects of ultraviolet-B radiation and pesticides in amphibians
… including pesticide contamination and UVB radiation. However, amphibian declines are likely caused by a combination of these factors. For two of these stressors that co-occur in aquatic habitats, little is known about the interactive effects of pesticides and UVB radiation in amphibians. …
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The effects of ultraviolet-B radiation on antioxidant status and survival in the zebrafish.
Increased exposure to solar radiation in the UV-B range (280-320 nm) is occurring globally at least partly due to anthropogenic degradation of stratospheric ozone. The direct impact of present ambient (1.95 W/m$\sp2$) and sub-ambient doses of UV-B radiation on muscle and skin tissue antioxidants in …
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The influence of ultraviolet-B radiation on benthic communities in Rocky Mountain streams with different metal exposure histories
… streams. Fully understanding the influence UVB radiation in aquatic systems requires estimates of UVB dose. Although radiometric equipment is available for quantifying UVB dose, it is expensive and often impractical for continuous use at remote sites. I applied polysulfone (PSF) dosimetry to …
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Changes in the Distribution of "Acris crepitans blanchardi", with Studies of Nesting Microhabitat and the Possible Impact of Ultraviolet-B Radiation
… its northern extreme. The possible impact of ultraviolet (UV) radiation was tested on six species of amphibian eggs as a possible cause for this decline. These included "Acris crepitans", "Ambystoma", "Bufo americanus", "Hyla versicolor complex", "Pseudacris triseriata", and "Rana pipiens". …
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Evaluating the clinical and physiological effects of long term ultraviolet B radiation on guinea pigs (Cavia porcellus) and rabbits (Oryctolagus cuniculus)
… this hormone through their diet, exposure to ultraviolet B (UVB) radiation and subsequent photobiochemical synthesis, or a combination thereof. The objectives for this research were to evaluate the clinical and physiologic effects of artificial UVB light supplementation on rabbits (Oryctolagus …
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Effects of ultraviolet-B radiation on plant growth, symbiotic function and concentration of metabolites in legumes and an assessment of F1 generation for carryover effects
… increase in ground level of biologically active ultraviolet-B (UV-B) radiation prompted research into the effect of UV-B on growth and metabolism of terrestrial plants. In this study, eight legume species including three tropical food grain legumes [Vigna unguiculata (L.) Walp. (cowpea), Glycine …
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Ultrastructural characterization of ultraviolet induced corneal disease : an animal model
… end of the nineteenth century the importance of ultraviolet radiation was being realized. Danish physician Niels Finsen, whom many regard as the father of ultraviolet phototherapy, also stressed that it was ultraviolet radiation in the solar spectrum which cause sunburn. We now recognize that the …
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Investigation of photoprotection of photosystem II by cytochrome b559
… center. Photoinhibitory reactions caused by ultraviolet B radiation (280-320 nm) are of particular concern since decreased stratospheric ozone is predicted to enhance levels of this radiation incident on the earth's surface. Photoinhibition can be initiated by inopportune events that create …