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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 “"Ultraviolet irradiation"”.
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Effect of Ozone and Ultraviolet Irradiation Treatments on Listeria monocytogenes Populations in Chill Brines
The efficacy of ozone and ultraviolet light, used in combination, to inactivate Listeria monocytogenes in fresh (9% NaCl, 91.86% transmittance at 254 nm) and spent chill brines (20.5% NaCl, 0.01% transmittance at 254 nm) was determined. Preliminary studies were conducted to optimize parameters for …
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Mechanisms of Epidermal Growth Factor Receptor Regulation of Epidermal Proliferation and Skin Tumorigenesis in Response to Ultraviolet Irradiation.
… proliferation and proliferation in response to ultraviolet (UV) irradiation, resulting in increased skin tumor growth. The mechanisms of EGFR’s mitogenic effects on keratinocytes were examined using EGFR null keratinocytes and an EGFR inhibitor. Genetic ablation or inhibition of EGFR decreased …
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patial Control of the Conductivity of Poly(3,4-ethylenedioxythiopehe): Poly(styrenesulfonate) Thin Films
… from rapid thermal processing and direct ultraviolet irradiation at a wavelength of 254 nm. Through various characterization methods, the underlying physical changes as a result of rapid thermal annealing indicate a shift of morphology that correlates to an increase in material …
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DERIVATIVES OF 2-BENZYLIDENECYCLOHEXANONE AS POTENTIAL ANTINEOPLASTIC AGENTS
… in vitro, and a low level of toxicity in mice. Ultraviolet irradiation resulted in isomerization of the substituted (E)-2-benzylidenecyclohexanones to the Z isomers. (Z)-2- Benzylidenecyclohexanone was isolated from the ultraviolet irradiation of the E isomer. Ultraviolet spectroscopy and the …
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Behavior of passaged chondrocytes in collagen-glycosaminoglycan scaffolds : effects of cross-linking, mechanical loading, and genetic modification of the scaffold
… as follows: dehydrothermal treatment (DHT) < ultraviolet irradiation (UV) < gluteraldehyde (GTA) < carbodiimide (EDAC). EDAC scaffolds also provided for the highest levels of cell proliferation and protein and GAG synthesis throughout a 4-week culture. Static mechanical compression (0-50% …
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Role of CDC25 Phosphatases in Non-Melanoma Skin Cancer
… United States, result from chronic exposure to ultraviolet irradiation (UV). UV-induced DNA damage activates cell cycle checkpoints through a mechanism involving degradation of the cyclin dependent kinase activators, the cell division cycle 25 (CDC25) phosphatases, and also activates Erbb family …
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Advancing Monitoring and Mitigation of Antibiotic Resistance in Wastewater Treatment Plants and Water Reuse Systems
… processes (chlorination, chloramination, and ultraviolet irradiation [UV]) on the inactivation of antibiotic resistant pathogens and corresponding susceptible pathogens in recycled and potable water. Further, we evaluated their regrowth following disinfection by simulating distribution. …
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Use of Ultraviolet Light for the Inactivation of Listeria monocytogenes and Lactic Acid Bacteria Species in Recycled Chill Brines
… of this study was to determine the effect of ultraviolet irradiation on the inactivation of Listeria monocytogenes and lactic acid bacteria in a model brine chiller system. Two concentrations of brines (7.9%w/w or 13.2%w/w) were inoculated with a ~6.0 log10 CFU/ml cocktail of L. monocytogenes …
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Flower Isoforms Increase Expression in Response to Cellular Stress and Modulate S100 Expression in Cutaneous Squamous Cell Carcinoma Cells
… of cSCC cells to stress stimuli including ultraviolet irradiation, serum starvation, reactive oxygen species, or 5-fluorouracil increased hFWE expression, suggesting hFWE may be involved in the cellular stress response. Taken together, these results document a strong correlation between …
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Interrogations of protein and RNA: localisation, interactions and dynamics
… to the post-transcriptional control of the ultraviolet irradiation induced stress response and stem cell pluripotency phase transition. In Chapter 3, a one-step subcellular fractionation procedure using multiple iodixanol containing gradients, termed “MultiLOPIT”, is presented, which …
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The Impact of Vitamin D on the Epidemiology, Pathogenesis, and Treatment of Esophageal Adenocarcinoma
… association between increased exposure to ultraviolet irradiation and decreased incidence of esophageal adenocarcinoma. Refluxed acid and bile create an inflammatory milieu that in part may be mediated by 1,25(OH)2D by interacting with cyclooxygenase pathways, mitigating DNA damage, playing …
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Site-Isolation, Intramolecular Energy Transfer, and Crosslinking in Synthetic Dendritic Quinacridones
… generation dendrimers were photopolymerized via ultraviolet irradiation. The films were resistant to solvent after the polymerization step indicating a stable crosslinked network. Standard photolithography was performed on the higher generation dendrimers to achieve feature sizes as small as 5 …
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Polymer molecular sieve membranes
… PIM-1 polymer as a prototype, we discovered that ultraviolet irradiation of PIM-1 membranes in the presence of oxygen induces oxidative chain scission at the surface, resulting in local densification and structural transformation of free volume elements. Consequently, the membrane become …
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Long Range Transport of Microorganisms in the Upper Atmosphere
… transport. Most (99.9%) of cells were killed by ultraviolet irradiation within several hours, indicating that the upper atmosphere can be a critical barrier to long-distance microbial dispersal. Overall, we discovered the upper atmosphere contains a surprising degree of microbial richness and …
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Disruption of Dna Polymerase Zeta Promotes An Innate Immune Response
… sensitive to genotoxic stresses including ultraviolet irradiation and platinum compounds such as the chemotherapeutic agent cisplatin. This elevated sensitivity arises from the central role of pol ζ in lesion bypass. Pol ζ is also required to protect cells from endogenous genomic damage or …
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Fracture of a Model Functionally Graded Material Manufactured From a Photo-Sensitive Polyethylene
… graded materials were manufactured by selective ultraviolet irradiation of ECO [poly(ethylene carbon monoxide)], a photo-sensitive ductile copolymer that becomes more brittle and stiffer under exposure to ultraviolet light. The mechanical response of the irradiated materials was characterized …
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Fundamentals of Excess Electron Transport in Biologically Relevant Systems
… dimers are premutagenic lesions that form via ultraviolet irradiation of DNA. While the distribution of thymine dimers is non-random, it is also not yet predictable. Thymine dimer accumulation is likely to be controlled by both its formation and reversion. Formation of thymine dimers occurs via …
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Light Stimulation of Sensory Hair Cells
… a novel method of hair-bundle stimulation: irradiation with light. The original aim of this study was to elucidate the role of Ca<sup>2+</sup> in fast adaptation, a process thought to underlie a hair bundle's ability to amplify stimuli. I aimed to do this by generating intracellular surges …
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Modification of the hog cholera virus
… in either the alternate or serial passages. Ultraviolet Irradiation or the Virus The hog cholera virus in the form of a pig-spleen suspension was irradiated by the Westinghouse lamps CH4 and Wl793. The virus was irradiated at a distance of 15 centimeters from the lamp. The suspension was …
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The relationship between cupric ion activity and the toxicity of copper to phytoplankton
… Sound and in salt marsh water subjected to prior ultraviolet irradiation.
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