Ultraviolet irradiation
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Observational studies have reported an inverse association between ultraviolet (UV) radiation and hypertension. The aim of this study was to assess differences in blood pressure changes between persons with dementia receiving UV light versus vitamin D (VD) supplementation.
9p vinobelprisen 26-03-2022 12 5 Download
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The results suggest that the improved NP characteristics on a steel mesh substrate, including multi- and mixed metal oxides, can display photocatalytic antibacterial activity against E. coli along with minimization of NP exposure due to NP immobilization.
8p meyerowitz 25-12-2021 8 0 Download
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To decrease the band gap of TiO2 and enhance its photocatalytic performance, in this work, N-doped nanocrystalline TiO2 is synthesized successfully through a simple sol-gel synthesis process with dicyandiamide used as N source. The N-doped TiO2 photocatalysts have been characterized in detail by means of powder X-ray diffraction, Raman spectroscopy, infrared spectroscopy, UV-vis spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscope. The photocatalytic activities of N-doped TiO2 to different organic pollutants are significantly different.
10p tudichquannguyet 29-11-2021 8 1 Download
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The aim of this study was to investigate the effects of UV- irradiation, hot water dip (HWD) and ethanol vapours on the quality and storage life of moth bean sprouts (Phaseolus aconitifolius Jacq.). Moth bean seeds were washed, soaked and allowed to sprout. The sprouts were subjected to various treatments viz., ethanol vapour (30 min), hot water dip (500C for 2 min) and UV-Irradiation (10 kJm-2 for 1 h).
9p nguathienthan8 20-10-2020 12 2 Download
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Understanding the underlying molecular mechanisms involved in the formation of cutaneous malignant melanoma is critical for improved diagnosis and treatment. Keratinocytic nuclear receptor Retinoid X Receptor α (RXRα) has a protective role against melanomagenesis and is involved in the regulation of keratinocyte and melanocyte homeostasis subsequent acute ultraviolet (UV) irradiation.
13p vimanama2711 30-07-2020 26 1 Download
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This paper presents the preliminary analysis of ground-based measurements solar data in Umlazi, South Africa. From this analysis, data statistics and statistic models for the global horizontal irradiance (GHI), the direct horizontal irradiance (DHI) and the ultraviolet radiations (UVR) are obtained for Durban and surrounding areas. Those results can be used in the design and analysis of solar systems and can also be used as referential parameters for further assessment of solar energy potentials for those areas.
10p cleopatrahuynh 01-06-2020 9 0 Download
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Titanium dioxide (TiO2) is added in sunscreens due to its ability to absorb ultraviolet (UV) light. However, upon irradiation of UV light, reactive oxygen species particularly hydroxyl radical which can damage human skin will be generated. In this study, lignin/TiO2 composites were employed to quench the hydroxyl radicals generated by the TiO2.
14p vijiraiya2711 27-05-2020 8 0 Download
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Ultraviolet B (UV-B) irradiation can influence many cellular processes. Irradiation with high UV-B doses causes chlorophyll degradation, a decrease in the expression of genes associated with photosynthesis and its subsequent inhibition.
16p vihashirama2711 21-05-2020 18 1 Download
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We present the ambitions of the SWUSV (Space Weather and Ultraviolet Solar Variability) Microsatellite Mission that encompasses three major scientific objectives: (1) Space Weather including the prediction and detection of major eruptions and coronal mass ejections (LymanAlpha and Herzberg continuum imaging); (2) solar forcing on the climate through radiation and their interactions with the local stratosphere (UV spectral irradiance from 180 to 400 nm by bands of 20 nm, plus Lyman-Alpha and the CN bandhead); (3) simultaneous radiative budget of the Earth, UV to IR, with an accuracy better t...
17p kethamoi1 17-11-2019 10 1 Download
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Bergapten has long been used in combination with ultraviolet A irradiation to treat depigmentation disorder. However, extremely low bergapten contents in plants and difficulties in synthesizing bergapten have limited its application. Here, we developed an alternative bergapten-production method. We first determined the crystal structures of bergaptol O-methyltransferase from Peucedanum praeruptorum (PpBMT) and the ternary PpBMT–S-adenosyl-L-homocysteine (SAH)–bergaptol complex to identify key residues involved in bergaptol binding.
8p trinhthamhodang1 14-11-2019 15 1 Download
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We investigated the bactericidal effects by irradiation with a deep-ultraviolet light-emitting diode (DUV-LED) on the causative microorganisms of catheter related blood stream infection contaminating the solution for intravenous infusion. For irradiation, prototype modules for water disinfection with a DUV-LED were used.
7p vinasaki2711 12-11-2019 9 0 Download
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The maintenance of plant genome integrity plays a critical function in the processes of DNA replication, transcription, and repair. Short-wave UV radiation (UVC) is among the most harmful agents known to affect genome stability and to induce DNA damage, including double-strand breaks (DSBs).
6p vikimsa 22-02-2019 23 1 Download
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Ultraviolet B (UV-B) irradiation has an adverse effect on plant cells because it causes the generation of reactive oxygen species (ROS). This is scavenged by some endogenous defense systems. In this study, the activities of H2O2- detoxifying antioxidant enzymes in 4 barley cultivars pretreated with high temperature or NaCl before UV-B irradiation were investigated.
10p vivant2711 01-02-2019 19 0 Download
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We have examined the consequences of Ultraviolet-B (UV-B) irradiation in the thallus of the lichen Physcia semipinnata in terms of cell viability and apoptotic-like formation.
8p vivant2711 01-02-2019 19 1 Download
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The materials were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and Ultraviolet-visible diffuse reflectance spectroscopy. The photocatalytic activity of CN-500/TaO-W samples was assessed by degradation of methylene blue in aqueous solution under visible light. Among them, CN-500/TaO-4 exhibited the best performance. An enhancement in photocatalytic activity of the composites is believed to be the presence of g-C3N4.
6p giesumanh 10-11-2018 41 1 Download
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The depletion of stratospheric ozone results in increasedUV (ultraviolet) light below 300 nm, and has signi®cant eects onbiological systems.Tobetterunderstand the eectsofUV in this range, early signaling events induced by monochro-maticUV lightwere investigatedusing the chickenBcell line DT40 andmutants lacking protein tyrosine kinases (PTKs). AmongMAPkinase familyproteins, P38MAPkinase (P38) was selectively and immediately activated by 280 nm UV light in cultured DT40 cells.
7p research12 23-04-2013 34 1 Download
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Cyclobutane-type pyrimidine dimers generated by ultraviolet irradiation of DNA can be cleaved by DNA photolyase. The enzyme-catalysed reaction is believed to be initiated by the light-induced transfer of an electron from the anionic FADH ) chromophore of the enzyme to the pyrimidine dimer. In this contribution, first infrared experiments using a novel E109A mutant ofEscherichia coliDNA photolyase, which is catalytically active but unable to bind the second cofactor methenyltetrahydrofolate, are described....
0p awards 06-04-2013 27 1 Download
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Critical aspects for the wider application of ultraviolet (UV) light in drinking water treatment sometimes have been described, in spite of the success of the method as established in the field: • Absence of well-established and generally accepted design rules • Absence of a permanently active residual agent in the treated water • Suspicions of the possible photochemical formation of by-products • Possibility of revival–reactivation by repair mechanisms of irradiated organisms • Need for operational control of the permanent reliability of the technique...
168p crazy_sms 10-05-2012 109 29 Download
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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Facile Preparation of Crosslinked Polymeric Nanocapsules via Combination of Surface-Initiated Atom Transfer Radical Polymerization and Ultraviolet Irradiated
5p dauphong17 21-02-2012 44 3 Download
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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Influenza and Ultraviolet Germicidal Irradiation
2p dauphong5 25-12-2011 27 2 Download