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Ultraviolet light C

Lisa Soyeon Baik, Yocelyn Recinos, Joshua A Chevez, Todd C Holmes
Many insects show strong behavioral responses to short wavelength light. Drosophila melanogaster exhibit Cryptochrome- and Hyperkinetic-dependent blue and ultraviolet (UV) light avoidance responses that vary by time-of-day, suggesting that these key sensory behaviors are circadian regulated. Here we show mutant flies lacking core clock genes exhibit defects in both time-of-day responses and valence of UV light avoidance/attraction behavior. Non-genetic environmental disruption of the circadian clock by constant UV light exposure leads to complete loss of rhythmic UV light avoidance/attraction behavior...
2018: PloS One
Lilian C Russo, Pault Y Minaya, Luiz E Silva, Fábio L Forti
Ultraviolet light crossing the ozone layer in the atmospheric barrier affects all forms of living beings on earth. In eukaryotic cells, the nucleotide excision repair (NER) pathway protects the DNA by removing cyclobutane pyrimidine dimers (CPDs) and 6-4-photoproduct (6-4-PP) lesions caused by ultraviolet (UV) light, allowing cells to proliferate. On the other hand, adhesion and invasion processes, primarily regulated by the typical Rho GTPases Rho, Rac, and Cdc42, are also affected by UV radiation effects...
2018: Methods in Molecular Biology
Maryam Yazdan Mehr, Willem van Driel, Francois De Buyl, Kouchi Zhang
Degradation mechanisms of silicone plates under harsh environment conditions are studied in this investigation. Environmental degradation of silicone free form, used as secondary optics in Light Emitting Diode LED lighting lamps and luminaires or any other applications requiring high quality optics being used, has negative implications for the optical performance. Degradation of silicone plates in harsh environment conditions was studied in salt bath and swimming water environments, using different light radiation and temperatures...
July 28, 2018: Materials
Chun-Lin Kuang, Du Lv, Guang-Hui Shen, Shan-Shan Li, Qing-Ying Luo, Zhi-Qing Zhang
Volatile oil in Chrysanthemum morifolium Ramat ( C. morifolium ) was extracted by the method of water vapor distillation and its chemical components was identified by gas-chromatography coupled with mass spectrometry (GC-MS). The volatile oil are evaluated for antibacterial activity against Escherichia coli , Staphylococcus aureus, Salmonella enteritids, Pseudomonas aeruginosa and Bacillus subtilis . Effects of surfactant, temperature, pH and ultraviolet light on antibacterial activity stability of volatile oil were analyzed too...
July 2018: Journal of Food Science and Technology
Araya Zaesim, Amanda C Jackson, Sang Wook Lee, Shaun A Price
Cutaneous squamous cell carcinoma (SCC) is a common form of skin cancer and often appears as a hard, scaly lump that occasionally ulcerates. It is usually associated with cumulative exposure to ultraviolet light, although prior scarring, chronic wounds, exposure to radiation, HPV infection, and immunosuppression are also associated risk factors. Primary SCC of the nipple is very rare and only a few cases have been reported. We present a case of a 49-year-old female with concerns of a right nipple lesion with erythema and pain...
2018: Case Reports in Dermatological Medicine
Victor W Brar, Michelle C Sherrott, Deep Jariwala
The isolation of thermodynamically stable, free standing materials with single to few atom thicknesses has brought about a revolution in materials science, condensed matter physics and device engineering for opto-electronic applications. These two dimensional (2D) materials cover a broad range of electronic properties ranging from zero-band gap, semi-metallic graphene to wide band gap semiconductors in sulfides and selenides of Mo and W to metallic behavior in Ti, Nb and Ta sulfides and selenides. This permits their potential application in opto-electronic devices from terahertz frequencies up to the ultraviolet portion of the spectrum...
July 19, 2018: Chemical Society Reviews
Ibrahim N Mwangi, Eric L Agola, Robert M Mugambi, Esther A Shiraho, Gerald M Mkoji
Human intestinal schistosomiasis is caused by the blood fluke, Schistosoma mansoni. With intensified efforts to control schistosomiasis by mass drug administration using praziquantel (PZQ), there is an urgent need to have accessible, quality-assured diagnostic tests for case detection and disease surveillance and for monitoring efficacy of treatment and other interventions. Current diagnostic tools are limited by suboptimal sensitivity, slow turn-around-time, affordability, and inability to distinguish current from past infections...
2018: Journal of Parasitology Research
Isabel Barroso-Martín, Antonia Infantes-Molina, Aldo Talon, Loretta Storaro, Elena Rodríguez-Aguado, Enrique Rodríguez-Castellón, Elisa Moretti
In this work, SBA-15 silica and silica-titania have been used as supports for photocatalysts based on AuCu alloy (Au:Cu = 1) to be used in the preferential oxidation of CO (CO-PROX) in excess of hydrogen at room temperature and atmospheric pressure both in the dark and under simulated solar light irradiation. To study their textural, structural, chemical and optical properties, the samples were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), adsorption-desorption of N₂ at -196 °C, 13 C and 29 Si solid state nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS) and diffuse reflectance ultraviolet-visible (DRUV-vis) spectroscopy...
July 13, 2018: Materials
An Xie, Benjamin Gallant, Hao Guo, Alfredo Gonzalez, Matthew Clark, Audrey Madigan, Feng Feng, Hong-Duo Chen, Yali Cui, Samuel C Dudley, Yinsheng Wan
Resting membrane potential (RMP) and intracellular Ca2+ concentration [(Ca2+ )i ] are involved in tumorigenesis and metastasis. The present study investigated whether functional cardiac Na+ channels are expressed in human melanoma cells (WM 266-4) and its nonmalignant human melanocytes (HMC), as well as whether they participate in RMP maintenance and Ca2+ homeostasis. Confocal microscopy and western blot analysis were used to detect Na+ channels. The patch-clamp technique was employed to record Na+ currents and action potentials...
August 2018: Oncology Letters
Matthew P Stripp, Anna R Dulaney, Michael C Beuhler, Ricky L Langley
This case report highlights the challenges associated with the diagnosis and workplace evaluation of occupationally acquired ultraviolet (UV) radiation-induced photokeratitis and associated skin burns in a group of restaurant workers. UV-C spectrum bulbs were inadvertently shipped and installed in insect light traps. Ocular and dermal symptoms were reported in 18 of 85 restaurant employees to varying degrees of severity over a 2-day period. One patient was formally diagnosed with a chemical burn/irritation of the cornea...
July 11, 2018: American Journal of Industrial Medicine
Weiwei Ji, Zhiguo Xia, Ke Liu, Sayed Ali Khan, Luyuan Hao, Xin Xu, Liangjun Yin, Maxim S Molokeev, Simeon Agathopoulos, Wenyun Yang, Xiaobai Ma, Kai Sun, Ivan da Silva
A novel green-yellow emitting Ca1.5Mg0.5Si1-xLixO4-δ:Ce3+ phosphor with high quantum efficiency and thermal stability was discovered for applications in near ultraviolet pumped white light-emitting diodes. Its crystal structure was determined with a single-particle diagnosis approach. The Si sites in the SiO4 tetrahedra are reported for the first time to accommodate Li+ ions. This substitution, confirmed by 6Li solid-state NMR and T.O.F. neutron powder diffraction, causes a disordered occupation of Ca/Mg in the Ca3MgSi2O8 host and favors a phase transformation at ∼330 °C, which results in the formation of the novel phosphor...
July 24, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Sheng Zhang, Zhendong Hao, Liangliang Zhang, Guo-Hui Pan, Huajun Wu, Xia Zhang, Yongshi Luo, Ligong Zhang, Haifeng Zhao, Jiahua Zhang
Blue-emitting phosphors for near ultraviolet (NUV) based tri-color RGB phosphor blend converted white light emitting diodes (LEDs) have been extensively investigated in the past few years. LED chip peaked near 400 nm is the most efficient among the NUV chips currently. However, most of blue phosphors show inefficient excitation around 400 nm. Herein, a novel blue phosphor SrLu2 O4 :Ce3+ matching well with near 400 nm chip and showing high thermal stability has been developed. The photoluminescence spectrum presents a broad emission band peaking at 460 nm with a bandwidth of nearly 90 nm...
July 11, 2018: Scientific Reports
Ha-Rim An, Yong Cheol Hong, Hyeran Kim, Jin Young Huh, Edmond Changkyun Park, So Young Park, Yesul Jeong, Ji-In Park, Jong-Pil Kim, Young-Chul Lee, Woong-Ki Hong, You-Kwan Oh, Youn Jung Kim, MinHo Yang, Hyun Uk Lee
In this paper, it is first reported that gray hydrogenated TiO2 sphere photocatalysts (H-TiO2 ) with high reactivity to solar light are mass produced within a few minutes using an underwater discharge plasma modified sol-gel method at room temperature and atmospheric pressure. This plasma modified system is an easy one-step in-situ synthetic process and the crystallinity, hydrogenation, and spherical structure of H-TiO2 are achieved by the synergy effect between the continuous reaction of highly energetic atomic and molecular species generated from the underwater plasma and surface tension of water...
September 15, 2018: Journal of Hazardous Materials
Danielle R Gonçalves, John A Manthey, Paulo I da Costa, Marilia C M Rodrigues, Thais B Cesar
Citrus polymethoxylated flavones (PMFs) influence biochemical cascades in human diseases, yet little is known about how these compounds interact with cells and how these associations influence the actions of these compounds. An innate attribute of PMFs is their ultraviolet-light-induced fluorescence, and the fluorescence spectra of 14 PMFs and 7 PMF metabolites were measured in methanol. These spectra were shown to be strongly influenced by the compounds' hydroxy and methoxy substituents. For a subset of these compounds, the fluorescence spectra were measured when bound to human carcinoma Huh7...
July 18, 2018: Journal of Agricultural and Food Chemistry
Azar Ullah Mirza, Abdul Kareem, Shahab A A Nami, Mohd Shoeb Khan, Sumbul Rehman, Shahnawaz Ahmad Bhat, Abdulrahman Mohammad, Nahid Nishat
A phytoextract mediated synthesis of iron oxide nanoparticles using Agrewia optiva (Dhaman or Biul) and Prunus persica (Peach) leaf extract as capping and stabilizing agent without using hazardous toxic chemicals via biogenic route has been studied. The biogenic method of synthesis is convenient, rapid, cost effective and ecofriendly. The green synthesized nanoparticles were characterized by Ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, Attenuated total reflectance spectroscopy, X-ray diffraction analysis, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy and dynamic light scattering measurements...
August 2018: Journal of Photochemistry and Photobiology. B, Biology
De-Tian Xu, Jian-Na Yan, Wei Liu, Xiao-Xiao Hou, Yan Zheng, Wei-Wei Jiang, Qiang Ju, Christos C Zouboulis, Xiu-Li Wang
BACKGROUND: The ultraviolet-induced red fluorescence (UVRF) from human skin follicles was suggested to be a result of Propionibacterium acnes and was used for the monitoring of acne. More recent studies suggested that the UVRF may be more related to sebum rather than to microorganisms. OBJECTIVE: To clarify whether human sebum or follicular microorganisms are the source of UVRF. METHODS: We examined the fluorescence of human-derived SZ95 sebocytes, human sebaceous glands, sebum extracted from the sebaceous glands, and bacteria isolated from human hair follicles under ultraviolet light...
2018: Dermatology: International Journal for Clinical and Investigative Dermatology
Caiyan Yu, Mengmeng Cao, Dong Yan, Sunqi Lou, Chao Xia, Tongtong Xuan, Rong-Jun Xie, Huili Li
Eu2+ and Eu3+ co-doped Ga2 O3 nanocrystals (Ga2 O3 :Eu NCs) were synthesized in an organic phase at a low reaction temperature of 300 °C. The surface of Ga2 O3 :Eu NCs was passivated by oleylamine (OAm) and acetylacetone (acac). The coexistence of Eu2+ and Eu3+ as well as passivation by acac and OAm enable Ga2 O3 to be excited in the broad spectral range of 200-500 nm. The broadened absorption band is attributed to the strong acac → Ln(III) ligand to the metal charge transfer transition at ∼370 nm, Eu(III) f-f allowed 7 F0  → 5 L6 transition at 395 nm, and 7 F0  → 5 D2 transition at 465 nm, as well as the efficient electronic transition of Eu(II) 4f → 5d at ∼400 nm...
June 22, 2018: Journal of Colloid and Interface Science
A M Dibos, M Raha, C M Phenicie, J D Thompson
Single atoms and atomlike defects in solids are ideal quantum light sources and memories for quantum networks. However, most atomic transitions are in the ultraviolet-visible portion of the electromagnetic spectrum, where propagation losses in optical fibers are prohibitively large. Here, we observe for the first time the emission of single photons from a single Er^{3+} ion in a solid-state host, whose optical transition at 1.5  μm is in the telecom band, allowing for low-loss propagation in optical fiber...
June 15, 2018: Physical Review Letters
G J Venter, S N B Boikanyo, C J De Beer
Culicoides biting midges (Diptera: Ceratopogonidae) are vectors of a range of orbiviruses that cause important veterinary diseases such as bluetongue and African horse sickness. The effective monitoring of Culicoides species diversity and abundance, both at livestock and near potential wildlife hosts, is essential for risk management. The Onderstepoort 220-V ultraviolet (UV) light trap is extensively used for this purpose. Reducing its power requirements by fitting low-energy light-emitting diodes (LEDs) can lead to greater flexibility in monitoring...
June 28, 2018: Medical and Veterinary Entomology
Pinkuan Zhu, Qianwen Li, Sepideh M Azad, Yu Qi, Yiwen Wang, Yina Jiang, Ling Xu
Short-wave ultraviolet (UV-C) treatment represents a potent, clean and safe substitute to chemical sanitizers for fresh fruit preservation. However, the dosage requirement for microbial disinfection may have negative effects on fruit quality. In this study, UV-C was found to be more efficient in killing spores of Botrytis cinerea in dark and red light conditions when compared to white and blue light. Loss of the blue light receptor gene Bcwcl1 , a homolog of wc-1 in Neurospora crassa , led to hypersensitivity to UV-C in all light conditions tested...
2018: Frontiers in Microbiology
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