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 20 of 47 for “"UV-A"”.
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Effect of UV-A irradiance on lipid accumulation in Nannochloropsis oculata
… this project were (1) to determine the effect of UV-A (320 - 400 nm), a potential environmental stress factor, on total lipid accumulation in <italic>Nannochloropsis oculata</italic>, (2) to examine if there is reciprocity in the relationship of exposure duration to exposure irradiance on the …
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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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Evaluation of Discomfort Glare and Pavement Marking Material Visibility for Eleven Headlamp Configurations
… and in combination with three levels of UV-A. In addition, three other headlamp configurations were evaluated. Discomfort glare was measured subjectively for each headlamp configuration. Pavement marking visibility was directly measured via pavement marking detection distances. Thirty …
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Removal of organic compounds from aquatic environments by advanced oxidation processes.
… harmful contaminants. Photoinduced photolysis by UV-A 365 nm LED irradiation was explored during bench-scale experiments for the removal of Microcystis aeruginosa cells and microcystins. A common way of verifying the effects of light-driven treatments on cyanobacteria is by performing lab-scale …
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Identification of Near-Uv Chromophores and Characterization of Cellular Responses to Near-Uv Damage and Oxygen Stress
… effect. DNA is the primary chromophore in the UV-C region of electromagnetic spectrum (100-280nm; also known as Far UV or germicidal-UV), and its interaction with UV-C has been extensively studied. However, DNA has very little absorbance in the UV-A region (315-400nm). The identification of …
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Survival of Antarctic Bacteria Exposed to Ultraviolet and Visible Light
… 2.0% NaC1 and exposed to sunlight (20,000 Lux), UV-C (1.0 X 10⁻⁶ W/cm²), UV-B (1.0 X 10⁻⁶ W/cm²) and UV-A (1.5 X 10⁻⁶ W/cm²). The cultures were diluted to a final absorbance of 0.01 at 540 nm for sunlight and to 0.1 for the UV light exposures. All strains were sensitive to UV-C exposure with 64T …
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INVESTIGATION OF NEW THERAPEUTIC TARGETS OF RESPIRATORY VIRUSES: A NOVEL METHOD EXPLOITING UV RADIATION ¿ PROOF OF CONCEPT BASED ON SARS-COV-2 ¿
… the inhibitory effects of ultraviolet (UV) radiation that reaches the Earth's surface (UV-B, and UV-A) on SARS-CoV-2 to better characterize seasonal viral spread. Subsequently, UV-C radiation was exploited in an in vitro infection assay to develop an unbiased/multidisciplinary roadmap …
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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)
… 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 …
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The Role of Reactive Oxygen Species in Near-Ultraviolet (320-400 NM) Light Inactivation of Escherichia Coli
The biological effects of near-UV (320-400 nm; UV-A) radiation are still poorly understood. It has been clearly established, however, that the mechanism of inactivation by these wavelengths differ from that of far-UV (200-290 nm) radiation. The involvement of oxygen in the near-UV inactivation …
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Assessing the Biomechanical Properties of Cornea using Optical Coherence Elastography
… rabbit cornea in situ after partial riboflavin/UV-A corneal collagen cross-linking using OCE; 4) rapid characterization of the biomechanical properties of porcine corneas before and after UV-induced collagen cross-liking at different intraocular pressures by OCE; 5) the development of method to …
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Is Alnus viridis 'a' glacial relict in the Black Forest ?
… The most important photoreceptor seems to be the UV-B receptor, whose action is complemented by UV-A/BL receptor(s). Phytochromes are not involved. A similar result is observed for the anthocyanins one of the end products of the flavonoid biosynthesis. In contrast, phytochromes are clearly …
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Développement d'un photocatalyseur à base d'oxyde de titane pour l'élimination de polluants et de bactéries en milieu aqueux
… potable dans certaines régions du globe, de nouvelles techniques d’épuration nécessitant de faibles consommations d’énergie sont étudiées. Parmi ces nouvelles techniques, la photocatalyse hétérogène utilise des réactions d’oxydation et de réduction pour la dégradation de polluants organiques et …
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Zone plate array lithography in the deep UV
… the study has been conducted in the deep UV; a process to create zone plates with 250 nm theoretical spots sizes for this regime was developed. Familiarity with nanofabrication technology proved essential, especially e-beam lithography. Next, an optical setup was built replete with …
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Designing of a prototype heat-sealer to manufacture solar water sterilization pouches for use in developing nations
… it safer for drinking and cooking using the UV-A rays and heat from the sun. Even simple processes such as this, require components that are not easily attainable in many rural areas-in this case the recommended two-liter bottle. Amy Smith, an instructor in MIT's Edgerton Center, researched …
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Anacardium occidentale: avaliação do efeito fotoprotetor e conservante em preparações cosméticas
… crônica da pele a radiação ultravioleta (UV) solar pode causar vários danos a pele dependendo da quantidade, forma da radiação UV e tipo de indivíduo exposto. Os danos incluem queimaduras solares, estresse oxidativo e fotoenvelhecimento. O fotoprotetor minimiza agressões cutâneas …
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ATM-Dependent ERK Signaling in Response to DNA Double Strand Breaks
… with Hoechst 33258 followed by long wave-length UV (UV-A) (BrdU photolysis). BrdU photolysis resulted in well-controlled, dose-dependent generation of DSBs equivalent to 0.2 - 20 Gy of IR, as detected by pulse-field gel electrophoresis, accompanied by dose-dependent H2AX phosphorylation at …
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The 52 and 60 kD Ro/SS-A : antigens where are they? : do anti-Ro/SS-A autoantibodies cause cutaneous disease?
… 52 kD and 60 kD Ro under conditions of stress (UV A or UVB with or without hormones, drugs, vitamins and heat shock). I could not identify translocation of the 52 or 60 kD antigens with purified antibodies, although some whole sera showed fluorescence. I can find no evidence that antibodies …
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Untersuchungen zur Erfassung und Bewertung der UV-Abschirmung bei Kulturvarietäten verschiedener Nutzpflanzenarten
… unter naturnahen Bedingungen die Effekte von UV-Strahlung auf die Akkumulation löslicher phenolischer Komponenten und die epidermale UV-Transmission in vivo bei Kulturvarietäten di- und monokotyler Arten untersucht. Durch die Versuchsanordnungen konnten die Effekte der spektralen Bereiche der …
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Development and Application of a Microfluidic Cultivation Platform for the Analysis and Control of Industrially Relevant Synthetic Microbial Co-Cultures
… IPTG) was used, which is only activated by short UV-A illumination. Significantly different growth rates of the L-lysine-auxotrophic strain could be measured by using different exposure times compared to no UV-A exposure. The L-lysine-auxotrophic strain showed highly heterogeneous growth behavior …
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Shedding Light on Biological and Ecological Function
… supercontinuum which will access the deep-UV, a region not easily accessible by prior techniques. Access to this region will pave the way to utilize our newly developed and evaluated fluorescence and luminescence probes within this work. Through this spectroscopy, new biological and …
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