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 14 of 14 for “"Ultraviolet radiation (UVR)"”.
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In vitro evaluation of Ultraviolet Radiation (UVR) exposure of the Retinal Pigmented Epithelium (RPE) and its relevance to Age-Related Macular Degeneration (AMD)
… individuals globally in 2020. The role of ultraviolet radiation (UVR) exposure in the pathology of AMD has been debated for decades with epidemiological evidence failing to find a clear consensus for or against it playing a role. A key reason for this is a lack of foundational research into …
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Behavioral Response to UVB Differs in Subalpine Populations of Daphnia Melanica
… National Park are exposed to high levels of ultraviolet radiation (UVR). UVR causes DNA damage that can be detrimental to the organism if not fixed. One way to avoid these harmful rays is to migrate to protected areas. In my study, I looked at two behaviors in <em>D. melanica</em>: diel …
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The Effects of Radon and its Progeny on Human Skin Cells
… +/- total (UVT) or 320 nm cut-on filtered (UVA) ultraviolet radiation (UVR). Cell viability, cytotoxicity, genotoxicity, and mode of cell death was ascertained using neutral red uptake, lactate dehydrogenase, and comet assays, and dual stain flow cytometry respectively. UVR alone induced a …
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The effect of UVA irradiation on the DNA damage response in a human keratinocyte cell line
… skin cells against the carcinogenic effects of ultraviolet radiation (UVR). In this research project, HaCaTs were used to investigate the direct and indirect effects of UVA irradiation on the DDR. Independent inhibition of ATM and ATR prior to irradiation with 50 kJ m-2 UVA caused cell survival …
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Anti-aging potential of some freshwater microalgae extracts
… genetics contribute to intrinsic aging, whereas ultraviolet radiation (UVR) contributes to extrinsic aging. Intrinsic aging is a predetermined process that produces fine wrinkles, whereas long-term UVR exposure (classified as photo-aging) causes patchy hyperpigmentation, dilated blood vessels, …
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The Role of Mucus in the Ultraviolet Radiation Protection of <em>Porites astreoides</em>
<p>High intensities of ultraviolet radiation (UVR) have been shown to detrimentally effect the growth, reproduction, and photosynthetic physiology of corals inhabiting tropical marine waters. One protective mechanism utilized by marine organisms, including corals, is the production of …
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Ultraviolet Radiation and Carotenoid Pigmentation in Symbiotic Anthozoans
… pigmentation and the role of carotenoids as ultraviolet radiation (UVR) photoprotectants and 2) the repopulation and photoadaptive response of symbiotic algae (i.e., zooxanthellae) after bleaching. An experiment was conducted to partition the effects of UVA (320 - 400nm), photosynthetically …
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Psychosocial Predictors of High School Adolescents' Sun-tanning and Sun-protective Behaviors
… United States (American Cancer Society, 2014). Ultraviolet radiation (UVR) exposure via sun-tanning is considered an important risk factor for development of melanoma. Sun-induced skin damage and sun-tanning habits are initiated in early life and promoted through later sun exposure patterns. …
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On the ecophysiology of Baltic cyanobacteria focusing on bottom-up factors
… to high levels of both photosynthetically active radiation (PAR, 400–700 nm) and ultraviolet radiation (UVR, 280–400 nm), in combination with low ratios of dissolved inorganic nitrogen and inorganic phosphorus (DIN:DIP). The ability of nitrogen fixation, a high tolerance to phosphorus starvation …
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The role of eicosanoids in the human skin's response to ultraviolet radiation.
Erythema is a hallmark skin response to excessive ultraviolet radiation (UVR) and is associated with cutaneous inflammation. Both are mediated by inflammatory mediators including nitric oxide (NO), prostaglandin E2 (PGE2) and chemoattractants such as 12-hydroxyeicosatetraenoic acid (12-HETE) …
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The role of eicosanoids in the human skin's response to ultraviolet radiation.
Erythema is a hallmark skin response to excessive ultraviolet radiation (UVR) and is associated with cutaneous inflammation. Both are mediated by inflammatory mediators including nitric oxide (NO), prostaglandin E2 (PGE2) and chemoattractants such as 12-hydroxyeicosatetraenoic acid (12-HETE) …
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Characterization of novel pathways in the phosphorus cycle of lakes
… P pathway is through the influence of ultraviolet radiation (UVR) on P cycling. UVR may alter P cycling abiotically through changes in P availability and biotically through changes in the acquisition and regeneration of dissolved P by plankton. However, the significance of P released …
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Effects ofUltraviolet Radiation on Newly Settled Recruits of the Reef-building Coral <em>Porites astreoide</em>
… nutrient poor waters where high intensities of ultraviolet radiation (UVR, 280-400 nm) exist. Several negative effects of UVR have been demonstrated on adult corals, such as reduced calcification and skeletal growth rates, damage to tissue, and disruption ofphotosynthesis in symbiotic algae. In …
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An examination of the bioactive lipids involved in skin cell inflammation and in response to ultraviolet radiation. Effect of n-3 polyunsaturated fatty acid supplementation on red blood cell and human dermal fatty acid and production of eicosanoids by HaCaT keratinocytes and 46BR.1N fibroblasts following exposure to UVR.
Ultraviolet radiation (UVR) in solar light is important for skin biology. It is involved in the development acute and chronic skin inflammation, aging and cancer, causing erythema, tanning and local or systemic immunosuppression. Omega-3 polyunsaturated fatty acids (n-3 PUFA) are considered anti- …