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Ultraviolet light C

C Stange, J P S Sidhu, S Toze, A Tiehm
Efficient treatment methods for the removal of antibiotic-resistant bacteria (ARB) and antibiotic resistance genes (ARGs) from drinking water are needed to reduce health risks. However, there is a lack of empirical data on ARB and ARG removal during conventional water disinfection processes. In this study, the removal of ARB and ARGs by three disinfection processes (chlorination, ozonation, and UV treatment) was investigated on a laboratory scale using Escherichia coli and Enterococcus faecium carrying ARGs...
February 6, 2019: International Journal of Hygiene and Environmental Health
Ruixue Jiang, Yaru Wei, Jiayu Sun, Jiaqin Wang, Zhilin Zhao, Yifei Liu, Xiaochen Li, Jiashun Cao
Large quantities of antibiotics are manufactured, used, and eventually discharged into alga-containing water environment as prototypes, by-products, or transformation products. Different activities of Chlamydomonas reinhardtii toward cefradine (CFD) were studied, and the results indicated that CFD is resistant (removal rate of 5.45-14.72%) in simulated natural water environment. Cefradine was mainly removed by hydrolysis, adsorption, desorption, photodecarboxylation, and photoisomerization. The effects of C...
February 4, 2019: Environmental Science and Pollution Research International
Huan He, Peiran Zhou, Kyle K Shimabuku, Xuzhi Fang, Shu Li, Yunho Lee, Michael C Dodd
This work investigated degradation (measured by qPCR) and biological deactivation (measured by culture-based natural transformation) of extra- and intracellular antibiotic resistance genes (eARGs and iARGs) by free available chlorine (FAC), NH2 Cl, O3 , ClO2 , and UV light (254 nm), and of eARGs by • OH, using a chromosomal ARG ( blt) of multidrug-resistant Bacillus subtilis 1A189. Rate constants for degradation of four 266-1017 bp amplicons adjacent to or encompassing the acfA mutation enabling blt overexpression increased in proportion to #AT+GC bps/amplicon, or in proportion to #5'-GG-3' or 5'-TT-3' doublets/amplicon, with respective values ranging from 0...
February 3, 2019: Environmental Science & Technology
Murilo Gonçalves da Rocha, Shirley Nakagaki, Geani Maria Ucoski, Fernando Wypych, Guilherme Sippel Machado
This paper reports the use of two layered hydroxide salts (LHS) (zinc hydroxide nitrate - ZHN - Zn5 (OH)8 (NO3 )2 ·2H2 O, and zinc hydroxide chloride - ZHC - Zn5 (OH)8 Cl2 ·H2 O) as catalysts for brilliant green (BG) organic dye bleaching, using hydrogen peroxide as oxidant. The LHS were prepared by precipitation reaction between an aqueous solution of zinc salts and an aqueous ammonia solution. The solids were characterized by powder X-ray diffraction (XRD), electron paramagnetic resonance (EPR), ultraviolet-visible electronic spectroscopy (UV-Vis) and Fourier-transform infrared spectroscopy (FTIR)...
January 28, 2019: Journal of Colloid and Interface Science
C L Zordan-Bronzel, M Tanomaru-Filho, E M Rodrigues, G M Chávez-Andrade, G Faria, J M Guerreiro-Tanomaru
AIM: To evaluate the cytocompatibility, bioactive potential, antimicrobial and antibiofilm activities of an experimental calcium silicate-based endodontic sealer, in comparison with TotalFill BC Sealer and AH Plus. METHODOLOGY: Cytocompatibility was assessed by methyltetrazolium (MTT) and neutral red (NR) assays, after exposure of the Saos-2 cells to the sealer extracts (1:2, 1:4, 1:8, 1:16 and 1:32 dilutions) for 24 h. The sealers were manipulated and placed in 12-well culture plates and exposed to ultraviolet light; then 5 mL of DMEM medium without serum was added...
January 31, 2019: International Endodontic Journal
Jennifer L Cadnum, Annette L Jencson, Scott A Gestrich, Scott H Livingston, Boris A Karaman, Kevin J Benner, Brigid M Wilson, Curtis J Donskey
OBJECTIVE: To evaluate the efficacy of multiple ultraviolet (UV) light decontamination devices in a radiology procedure room. DESIGN: Laboratory evaluation. METHODS: We compared the efficacy of 8 UV decontamination devices with a 4-minute UV exposure time in reducing recovery of methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant Enterococcus (VRE), and Clostridium difficile spores on steel disk carriers placed at 5 sites on a computed tomography patient table...
February 2019: Infection Control and Hospital Epidemiology
Nikoleta Kotsina, Federico Belli, Shou-Fei Gao, Ying-Ying Wang, Pu Wang, John C Travers, Dave Townsend
We demonstrate, for the first time, the application of rare-gas filled hollow-core photonic crystal fibres (HC-PCFs) as tuneable ultraviolet light sources in femtosecond pump-probe spectroscopy. A critical requirement here is excellent output stability over extended periods of data acquisition, and we show this can be readily achieved. The time-resolved photoelectron imaging technique reveals non-adiabatic dynamical processes operating on three distinct timescales in the styrene molecule following excitation over the 242-258 nm region...
January 29, 2019: Journal of Physical Chemistry Letters
E F Melo, W L S Clímaco, M V Triginelli, D P Vaz, M R de Souza, N C Baião, M A Pompeu, L J C Lara
Different sanitization methods were evaluated as alternatives to formaldehyde fumigation for the reduction of eggshell and yolk sac microbiological counts, improvement of eggshell quality, incubation parameters, and day-old chick quality. A total of 10,080 hatching eggs were collected from a 70-wk-old commercial broiler breeder flock and distributed in a completely randomized block design with seven treatments: fumigation with paraformaldehyde (5.03 g/m3/30 min), fumigation with ozone (5-15 ppm/30 min), ultraviolet light-C irradiation (8...
January 23, 2019: Poultry Science
Ting Zhang, Feng Wang, Peng Zhang, Yafei Wang, Hao Chen, Jian Li, Jiang Wu, Li Chen, Zhi David Chen, Shibin Li
Flexible photodetectors (PDs) have become a research hotspot due to their potential applications in foldable displays, wearable optoelectronic devices, and implantable biomedical sensors. Inorganic CsPbBr3 perovskites, an emerging class of stable metal halide perovskites, have been explored as photoactive materials in PDs due to their superior photoelectrical properties and simple processing. The reported temperature for the fabrication of high-quality CsPbBr3 films is usually higher than 150 °C, which hinders their application in flexible devices...
January 25, 2019: Nanoscale
Jason W Chan, Iwei Yeh, Ivan H El-Sayed, Alain P Algazi, Christine M Glastonbury, Patrick K Ha, Sue S Yom, Annemieke van Zante
BACKGROUND: Head and neck squamous cell carcinoma of unknown primary site (HNSCCUP) is a diagnostic challenge. Identification of an ultraviolet (UV) light-related DNA damage signature using next-generation sequencing (NGS) can classify the primary site of origin as cutaneous. METHODS: A 62-year-old male was seen with 2 months of left neck swelling. He was a lifetime nonsmoker but had a history of cutaneous squamous cell carcinoma (SCC) of the left helix. He was also found to have left hilar adenopathy...
January 11, 2019: Head & Neck
Edmond A Hooker, William J Faulkner, Lisa D Kelly, Robert C Whitford
OBJECTIVE: The Wood's lamp, a handheld instrument that uses long-wave ultraviolet (UV) light with magnification of 2-3 times, is commonly used by non-ophthalmologists for examining patients with eye complaints. The goal of current research was to determine the sensitivity and specificity of the Wood's lamp for common eye abnormalities. STUDY DESIGN: We examined a convenience sample of patients, 18 years of age and older, who presented for eye complaints to an urgent clinic of a large ophthalmology practice...
January 10, 2019: Emergency Medicine Journal: EMJ
Haitao Wang, Shan Liu, Yukun Song, Bei-Wei Zhu, Mingqian Tan
Nanosized materials may produce adverse physiological effects or potential health risks due to their unique physical and chemical properties. Herein, the universal presence of fluorescent carbon dots (CDs) in commercial beers was confirmed through a systematic survey. The beer CDs were roughly spherically shaped in appearance and emitted bright blue fluorescence under ultraviolet light with quantum yields (QYs) ranging from 1.42% to 3.92%. Furthermore, digestion, biodistribution, and cytotoxicity assessments of CDs from Snow beer were conducted as an example...
January 9, 2019: Nanotoxicology
J Kawai, D Chris McLendon, H-J Kim, S A Benner
While formaldehyde (HCHO) was likely generated in Earth's prebiotic atmosphere by ultraviolet light, electrical discharge, and/or volcano-created lightning, HCHO could not have accumulated in substantial amounts in prebiotic environments, including those needed for prebiotic processes that generate nucleosidic carbohydrates. HCHO at high concentrations in alkaline solutions self-reacts in the Cannizzaro reaction to give methanol and formate, neither having prebiotic value. Here, we explore the possibility that volcanic sulfur dioxide (SO2 ) might have generated a reservoir for Hadean HCHO by a reversible reaction with HCHO to give hydroxymethanesulfonate (HMS)...
January 7, 2019: Astrobiology
Bruno Langbehn, Katharina Sander, Yevheniy Ovcharenko, Christian Peltz, Andrew Clark, Marcello Coreno, Riccardo Cucini, Marcel Drabbels, Paola Finetti, Michele Di Fraia, Luca Giannessi, Cesare Grazioli, Denys Iablonskyi, Aaron C LaForge, Toshiyuki Nishiyama, Verónica Oliver Álvarez de Lara, Paolo Piseri, Oksana Plekan, Kiyoshi Ueda, Julian Zimmermann, Kevin C Prince, Frank Stienkemeier, Carlo Callegari, Thomas Fennel, Daniela Rupp, Thomas Möller
A significant fraction of superfluid helium nanodroplets produced in a free-jet expansion has been observed to gain high angular momentum resulting in large centrifugal deformation. We measured single-shot diffraction patterns of individual rotating helium nanodroplets up to large scattering angles using intense extreme ultraviolet light pulses from the FERMI free-electron laser. Distinct asymmetric features in the wide-angle diffraction patterns enable the unique and systematic identification of the three-dimensional droplet shapes...
December 21, 2018: Physical Review Letters
Mateja Grašič, Urša Malovrh, Aleksandra Golob, Katarina Vogel-Mikuš, Alenka Gaberščik
Proso millet (Panicum miliaceum L.) is an annual thermophilic, drought-resistant, short-season C4 grass that is suitable for growing under the present changing meteorological conditions. However, water shortage can reduce plant production and hinder mineral nutrition in plants, including silicon, which is of crucial importance for grasses. Ultraviolet radiation can mitigate the impacts of water shortage, and therefore we examined the effects of moderate water shortage and reduced ultraviolet radiation on different leaf traits, including leaf levels of silicon and other elements, and plant biomass production...
January 2, 2019: Photochemical & Photobiological Sciences
Stephanie L Gora, Kyle D Rauch, C Carolina Ontiveros, Amina K Stoddart, Graham A Gagnon
Ultraviolet light emitting diodes (UV LEDs) are a promising technology for the disinfection of water and wetted surfaces, but research into these applications remains limited. In the drinking water field, UV LEDs emitting at wavelengths ranging from 254 nm to 285 nm (UVC LEDs) have been shown to be effective for the inactivation of numerous pathogens and pathogen surrogate organisms at UV doses comparable to conventional germicidal UV lamps. Surface disinfection with UV light, from UVC LEDs or from conventional UV lamps, is not as well understood...
December 20, 2018: Water Research
Kyu-Shik Lee, Min-Gu Lee, Yun-Jeong Woo, Kyung-Soo Nam
Ultraviolet light (UV) is a major inducer of skin cancer. Therefore, recovery and removal of UV-damaged skin cells are important in the prevention of skin carcinogenesis. Here, we investigated the effect of deep sea water (DSW) in HaCaT keratinocyte exposed by UVB (λ = 290∼320 nm). The result showed that UVB-induced cell death was reinforced by DSW treatment in a hardness-dependent manner. Furthermore, the increase of cell death by DSW was associated with the down-regulation of survivin and RAD51 expressions induced by UVB...
December 24, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
Ute Gravemann, Wiebke Handke, Thomas H Müller, Axel Seltsam
BACKGROUND: The THERAFLEX UV-Platelets system (Maco Pharma) uses ultraviolet C (UVC) light for pathogen inactivation (PI) of platelet concentrates (PCs) without any additional photoactive compound. The aim of the study was to systematically investigate bacterial inactivation with this system under conditions of intended use. STUDY DESIGN AND METHODS: The robustness of the system was evaluated by assessing its capacity to inactivate high concentrations of different bacterial species in accordance with World Health Organization guidelines...
December 26, 2018: Transfusion
Ivo Sedláček, Roman Pantůček, Stanislava Králová, Ivana Mašlaňová, Pavla Holochová, Eva Staňková, Veronika Vrbovská, Pavel Švec, Hans-Jürgen Busse
A group of thirteen bacterial strains was isolated from rock samples collected in a deglaciated northern part of James Ross Island, Antarctica. The cells were rod-shaped, Gram-stain-negative, non-motile, catalase positive, and produced moderately slimy, ultraviolet light (UVC)-irradiation-resistant and red-pink pigmented colonies on R2A agar. A polyphasic taxonomic approach based on 16S rRNA gene sequencing, extensive biotyping, fatty acid profile, chemotaxonomy analyses, and whole genome sequencing were applied in order to clarify the taxonomic position of these isolates...
December 14, 2018: Systematic and Applied Microbiology
H Y Zhao, H T Wang, C Zhu, R Dang, M Liang, Z S Qi, D H Hu
Objective: To investigate the clinical effects of combined utilization of narrow-spectrum medium-wave ultraviolet, red light, and low power He-Ne laser on treatment of post-burn eczema. Methods: From July 2014 to July 2017, 80 patients with post-burn eczema who met the study inclusion criteria were treated in our burn rehabilitation center, and their clinical data were analyzed retrospectively. Patients were divided into ultraviolet treatment group, red light treatment group, laser treatment group, and combination treatment group according to the utilized treatment methods, with 20 cases in each group...
December 20, 2018: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
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