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 9 of 9 for “"ultraviolet A"”.
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Ultraviolet a irradiation on human skin : nitric oxide mediated cardiovascular responses
… mortality is caused by variations in ultraviolet exposure other than temperature. Known mechanisms of sunlight exposure that affect cardiovascular health include temperature and the ultraviolet B (UVB) mediated photolysis of 7-dehydrocholesterol in the skin to produce 1,25 …
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Photoprotective role of beta -carotene and antioxidant enzymes: A shield against ultraviolet damage in Dunaliella bardawil
… nm; 150 mumol photons·m -2·s--1), ultraviolet-A (320-400 nm) or ultraviolet-B (290-320 nm), independently, for 24 hour test periods. Ascorbate and glutathione concentrations, ascorbate peroxidase activity, photosynthetic oxygen evolution and fluorescence parameters were monitored …
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Ultraviolet-C Powered Air Purifying Respirator (UVC PAPR)
… respirator (PAPR) incorporating direct ultraviolet-C (UVC) germicidal irradiation. The proposed PAPR aims to provide enhanced protection by actively sterilizing air through this UVC chamber immediately prior to inhalation. This approach offers an advantage over traditional filter-based …
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Photocatalytic oxidation of pharmaceutical micropollutants in a flow-through reactor
… by black light bulbs, which emit light in the ultraviolet-A range. Experiments have shown this to be an effective method for degradation of these four drug compounds as they flow through the reactor. The drug compound entering the reactor experiences a rate of decay that leads to reasonable …
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Identification of Cathepsin B and L as Novel Uva Targets Upstream of Cutaneous Lysosomal-Autophagic Dysregulation
Chronic exposure to solar UVA plays a causative role in skin photoaging and photocarcinogenesis. Guided by exploratory difference-in-gel-electrophoresis (DIGE)-proteomics, we identified the thiol-dependent cysteine-proteases cathepsin B and cathepsin L as novel UVA-targets undergoing …
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UV- TiO2 photocatalytic degradation of the x-ray contrast agent diatrizoate: kinetics and mechanisms in oxic and anoxic solutions
… in aqueous TiO2 suspensions illuminated with ultraviolet-A (UVA) light under both oxic and anoxic conditions. Both oxidative and reductive transformation pathways for diatrizoate are initiated by photo-excited charge separation in the TiO2 semiconductor, which generates a strongly oxidizing …
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Outcomes of corneal crosslinking for the treatment of keratoconus at a tertiary South African hospital
… patients who underwent A-CXL, using 6.4 mW/cm2 ultraviolet-A irradiation for 15 min, for progressive KC between 1 May 2017 and 1 June 2018. All patients completed 6 months minimum follow-up (Mean 9months, range 6-15). The diagnosis of keratoconus was based on corneal tomography and its clinical …
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Photosynthetic and oxidative stress in the green alga Dunaliella tertiolecta: The effects of UV-B and UV-A radiation
<p>The penetration of ultraviolet-B (UV-B; 290-320 nm) into the biosphere has increased in response to decreased stratospheric ozone. As a consequence, significant attempts have been made to elucidate the effects of UV-B radiation on primary producers such as phytoplankton and plants. Considerably …
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High Resolution Paleothermometry Using Biogenic Silica: A Feasibility Study
… Energy-Dispersive X-ray Spectroscopy (EDX/EDS), Ultraviolet-A/blue light excited fluorescence photography, and petrographic microscope, and bulk ash was examined via spectrofluorimetry. Anomolies in the EDX spectra were later modeled using both a Monte Carlo electron transport model and an …