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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 20 of 25 for “"UVR"”.

  1. Single cell gel electrophoresis-based investigations of UVR- and visible light-induced single strand breakage in cultured human cells

    Kendall, Jeremy Fraser1999

    Single strand breaks induced by very low fluence UVR (20 µW cmˉ² , 310 nm) and visible light (70 µW cmˉ² , 405 nm) and higher fluence unfiltered xenon arc lamp radiation (3 mW cmˉ² ) were measured by single cell gel electrophoresis. The normal responses of 6 cell lines to the low fluence radiation …

    plymouth Repository record

  2. The Role of Mucus in the Ultraviolet Radiation Protection of <em>Porites astreoides</em>

    Schopmeyer, Stephanie Ann1970

    <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 …

    gsu Repository record

  3. In vitro evaluation of Ultraviolet Radiation (UVR) exposure of the Retinal Pigmented Epithelium (RPE) and its relevance to Age-Related Macular Degeneration (AMD)

    Anderson, GrahamThe University of Edinburgh2021

    … 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 the response of living …

    edinburgh Repository record

  4. Effects ofUltraviolet Radiation on Newly Settled Recruits of the Reef-building Coral <em>Porites astreoide</em>

    MacKichan, Carrie Ann1970

    … 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 addition, high UVR in …

    gsu Repository record

  5. The role of eicosanoids in the human skin's response to ultraviolet radiation.

    Gledhill, KarlUniversity of Bradford2010

    … 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) leading to vasodilation and …

    bradford Repository record

  6. 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.

    Al-Aasswad, Naser M.I.University of Bradford2013

    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- …

    bradford Repository record

  7. The impact of UV radiation on the health and pathogen development of the Pacific oyster (Crassostrea gigas)

    Kett, GaryUniversity College Cork2022

    … Vibrio such as V. aestuarianus. UV radiation (UVR) is an intertidal stressor which functions as an ecosystem regulator. UVR has disinfectant properties with the energetic potential to damage nucleic acids of microbes inhabiting surface waters. UVR can also have both positive and negative …

    cork Repository record

  8. The Effects of Radon and its Progeny on Human Skin Cells

    Luke Talbot (21037715)2025

    … 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 cytotoxic dose response more …

    exeter

  9. Characterization of novel pathways in the phosphorus cycle of lakes

    Sereda, Jeffrey MichaelUniversity of Saskatchewan2011

    … 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 from the …

    sask Repository record

  10. The Effects of Perspiration Application, Weathering Exposures, Washing Action of Automatic Home Clothes Washers, and Repeated Laundering on the Ultraviolet Protection of a Naturally Colored Lightweight Cotton Fabric

    Wong, Soak WaiVirginia Tech2014

    … several studies have been conducted on the UVR protection of naturally colored cotton, many questions regarding the factors that influence the UVR protection of fabrics remain unanswered. The primary purpose of the study was to examine the effects of perspiration application, weathering …

    vt Repository record

  11. Behavioral Response to UVB Differs in Subalpine Populations of Daphnia Melanica

    Tompkins, Amanda2017

    … 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 vertical migration (DVM), …

    central-wash Repository record

  12. Psychosocial Predictors of High School Adolescents' Sun-tanning and Sun-protective Behaviors

    Land, Diane M.

    … 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. Social norms, appearance …

    siu-theses Repository record

  13. Anti-aging potential of some freshwater microalgae extracts

    Sithole, Siphesihle Zamajobe.University of Zululand2023

    … 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, epidermal hyper …

    zulu Repository record

  14. Involvement of TGF-beta in skin photoaging

    Choi, Won Seon, 1975-Massachusetts Institute of Technology2005

    … matrix and is known to be up-regulated by UVR. Involvement of reactive oxygen species (ROS) in the development of solar elastosis has been demonstrated by many studies using antioxidants and anti-inflammatory agents in the mouse skin in vivo. We hypothesized that ROS produced by TGF-[beta] …

    mit Repository record

  15. The effect of UVA irradiation on the DNA damage response in a human keratinocyte cell line

    Eastham, Matthew, Allinson, SarahLancaster University2016

    … 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 to decrease in a …

    lancaster Repository record

  16. A Study of genetic instability and DNA repair in selected mutants of streptomyces cattleya

    Hromic, AlmaDepartment of Molecular and Cell Biology1987

    … and one, S26, as MMC sensitive. They were also UVr and UVˢ, respectively. The mutants were subjected to UV irradiation in order to obtain UV kill curves. The curves generated for the two MMCʳ mutants showed induction or derepression of a second repair system. In instability studies performed on …

    cape-town Repository record

  17. Assessing the Photoprotective Effects of Fluorescent Sphingomyelin Against UVB Induced DNA Damage in Human Keratinocytes

    Kandell, Rebecca Marie2018

    … year and results from Ultra Violet Radiation (UVR) damage to DNA in the form of pyrimidine dimers and photoproducts [1]–[5]. Cells directly detect the damage and initiate apoptosis, cell cycle arrest, or DNA repair by modulating p53 and p21 levels [6]–[9]. Current methods of photoprotection …

    calpoly Repository record

  18. Ultraviolet Radiation and Carotenoid Pigmentation in Symbiotic Anthozoans

    Mobley, Kenyon B.1970

    … 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 active radiation (PAR; …

    gsu Repository record

  19. The Mycobacterium tuberculosis KatG gene : identification of a novel function and analysis of the regulation of expression

    Mulder, Michelle AnneDivision of Medical Microbiology1998

    … irradiation (254 run) and hydrogen peroxide, and uvr mutants exposed to mitomycin C. Both the 5' and 3' regions of the M tuberculosis KatG protein conferred the above effects, and this was independent of the catalase or peroxidase activity of the enzyme. The results suggest that the M tuberculosis …

    cape-town Repository record

  20. Investigating The Roles of Tap63 and Tap73 In Cutaneous Squamous Cell Carcinoma and Lung Adenocarcinoma

    Davis, Andrew J2019

    … mice exhibit increased susceptibility to UVR-induced cuSCC. To identify TAp63-regulated transcriptional programs relevant to the pathophysiology cuSCC, we performed RNA sequencing of cuSCC and normal tissues from wild-type (WT) and TAp63-/- mice. My data revealed significant perturbations …

    uthsc Repository record

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