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Zhi Fang, Xingxing Jiang, Meihong Duan, Zhanyu Hou, Changcheng Tang, Mingjun Xia, Lijuan Liu, Zheshuai Lin, Feidi Fan, Lei Bai, Chuangtian Chen
For the explorations on deep ultraviolet (DUV) nonlinear optical (NLO) borates, a type of important optoelectronic materials, (BO3)3- group is long-termly regarded as the sole microscopic optical-active unit and the toxic Be-containing raw materials are frequently-adopted. Herein, a new DUV NLO crystal Cs2Al2(B3O6)2O (CABO) was designed and synthesized by simultaneously replacing the (BO3)3- groups and Be2+ cations in Sr2Be2(BO3)2O that possesses a favorable structure for large NLO response by (B3O6)3- units and Al3+ cations through cosubstitution approach...
April 15, 2018: Chemistry: a European Journal
Pham Van Viet, Truong Tan Sang, Nguyen Ho Ngoc Bich, Cao Minh Thi
Silver nanoparticles (Ag NPs) were synthesized by an improved green synthesis method via a photo-reduction process using low-power UV light in the presence of poly (vinyl pyrrolidone) (PVP) as the surface stabilizer. The effective synthesis process was achieved by optimized synthesis parameters such as C2 H5 OH: H2 O ratio, AgNO3 : PVP ratio, pH value, and reducing time. The formation of Ag NPs was identified by Ultraviolet-visible (UV-vis) absorption spectra, X-ray diffraction pattern (XRD) and Fourier transform infrared spectroscopy (FTIR) spectra...
April 7, 2018: Journal of Photochemistry and Photobiology. B, Biology
David Hanigan, Lisa Truong, Jared Schoepf, Takayuki Nosaka, Anjali Mulchandani, Robert L Tanguay, Paul Westerhoff
Both nanoparticulate (nZnO and nTiO2 ) and organic chemical ultraviolet (UV) filters are active ingredients in sunscreen and protect against skin cancer, but limited research exists on the environmental effects of sunscreen release into aquatic systems. To examine the trade-offs of incorporating nanoparticles (NPs) into sunscreens over the past two decades, we targeted endpoints sensitive to the potential risks of different UV filters: solar reactive oxygen production in water and disruption of zebrafish embryo development...
March 27, 2018: Water Research
Leandra Natália de Oliveira Neves, Rafael Marques, Paulo Henrique Fonseca da Silva, Marcone Augusto Leal de Oliveira
Lactulose is not found naturally in milk, but it has been detected in small quantities in heated dairy products. It can therefore be used as an indicator of the severity of heat treatment for dairy products. This study proposes an alternative method for lactulose quantification in milk using capillary zone electrophoresis with ultraviolet detection (CZE-UV). The investigation used several Brazilian UHT milk samples, and various sample pretreatment methods and injection conditions were considered. Optimal separation results were achieved using Carrez clarification solutions...
August 30, 2018: Food Chemistry
Umar Muzaffer, V I Paul, Nagarajan Rajendra Prasad, Ramasamy Karthikeyan, Balupillai Agilan
BACKGROUND: Juglans regia L. has a history of traditional medicinal use for the treatment of various maladies and have been documented with significant antioxidant and antiinflammatory properties. Although all parts of the plant are medicinally important, but male the flower of the plant has not been yet investigated against the photo-damage. PURPOSE: The present study, we sought to determine the photoprotective effect of the male flower of J. regia L. against ultraviolet-B radiation-induced inflammatory responses in human skin cells...
March 15, 2018: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
John E Zeber, Christopher Pfeiffer, John W Baddley, Jose Cadena-Zuluaga, Eileen M Stock, Laurel A Copeland, Janet Hendricks, Jwan Mohammadi, Marcos I Restrepo, Chetan Jinadatha
BACKGROUND: Inadequate environmental disinfection represents a serious risk for health care-associated infections. Technologic advancements in disinfection practices, including no-touch devices, offer significant promise to improve infection control. We evaluated one such device, portable pulsed xenon ultraviolet (PX-UV) units, on microbial burden during an implementation trial across 4 Veterans Affairs hospitals. METHODS: Environmental samples were collected before and after terminal room cleaning: 2 facilities incorporated PX-UV disinfection into their cleaning protocols and 2 practiced manual disinfection only...
April 11, 2018: American Journal of Infection Control
Helga Paula, Robert Becker, Ojan Assadian, Claus-Dieter Heidecke, Axel Kramer
OBJECTIVE: At present, the shortest recommended application time of alcoholic handrubs is an application interval of 30 seconds. However, application times shorter than 30 seconds are regularly practiced. Therefore, the aim of this study was to investigate whether a 15-second application time achieves a comparable wettability of hands to a 30-second handrub application. SETTING: The wettability of 20 healthy volunteers' hands was compared after 15 seconds or 30 seconds of application time of an ultraviolet-light-active handrub, both before and after training in the application technique...
April 11, 2018: American Journal of Infection Control
Edoardo Marrani, Ivan Foeldvari, Jordi Anton Lopez, Rolando Cimaz, Gabriele Simonini
OBJECTIVE: Localized scleroderma is a skin fibrosing disorder that, if untreated, may result in severe disability. The purpose of this systematic review is to compare the present evidence concerning the effectiveness of Methotrexate versus phototherapy, alone or associated with Psoralen, in childhood localized scleroderma. METHOD: A systematic search between January 1996 and May 2017 was performed to identify studies investigating the efficacy of Methotrexate (MTX) or phototherapy (UVA) for treating localized scleroderma with onset ≤18 years...
March 14, 2018: Seminars in Arthritis and Rheumatism
Erin E Cuyler, Robert H Byrne
A simple protocol was developed to measure seawater calcium carbonate saturation states (Ωspec ) spectrophotometrically. Saturation states are typically derived from the separate measurement of two other carbon system parameters, with each requiring unique instrumentation and often complex measurement protocols. Using the new protocol, the only required equipment is a thermostatted laboratory spectrophotometer. For each seawater sample, spectrophotometric measurements of pH (visible absorbance) are made in paired optical cells, one with and one without added nitric acid...
August 22, 2018: Analytica Chimica Acta
Yaoqi Ge, Yuejiao Zhong, Guozhong Ji, Qianling Lu, Xinyu Dai, Zhirui Guo, Peng Zhang, Gang Peng, Kangzhen Zhang, Yuntao Li
OBJECTIVE: To study the characterization of Fe3O4@Au-C225 composite targeted MNPs. METHODS: Fe3O4@Au-C225 was prepared by the absorption method. The immunosorbent assay was used to evaluate its absorption efficiency at C225 Fc. ZETA SIZER3000 laser particle size analyzer, ultraviolet photometer and its characteristics were analyzed by VSM. the targeting effect of Fe3O4@Au-C225 composite targeted MNPs on U251 cells in vitro were detected by 7.0 Tesla Micro-MR; and subcutaneous transplanted human glioma in nude mice were performed the targeting effect in vivo after tail vein injection of Fe3O4@Au-C225 composite targeted MNPs by MRI...
2018: PloS One
Jiaxin Quan, Shanshan Song, Kadir Abdulrashid, Yongfu Chai, Ming Yue, Xiao Liu
The negative effects of enhanced ultraviolet-B (UV-B) on plant growth and development have been reported with many species. Considering the ability of jasmonic acid (JA) to improve plant stress tolerance, the hypothesis that JA pretreatment could alleviate the adverse effects of UV-B on S. baicalensis was tested in this study with photosynthesis and growth characteristics. The results showed that UV-B or JA alone both induced photosynthesis inhibition and decreased biomass in stems and leaves. However, the photosynthetic reduction caused by increased UV-B was mainly related to the effect of nonstomatal-limitation, while that of JA was a stomatal-limitation effect...
April 13, 2018: International Journal of Molecular Sciences
Christopher J Stromberg, Edwin Jay Heilweil
[FeFe]-hydrogenases are efficient enzymes that produce hydrogen gas under mild conditions. Synthetic model compounds containing all CO or mixed CO/PMe3 ligands were previously studied by us and others with ultrafast ultraviolet (UV) or visible pump-infrared (IR) probe spectroscopy (TRIR) in an effort to better understand the function and interactions of the active site with light. Studies of anionic species containing cyano groups, which more closely match the biological active site, have been elusive. In this work, two model compounds dissolved in room temperature acetonitrile solution were examined: [Fe2(μ-S2C3H6)(CO)4(CN)2]2- (1) and [Fe2(μ-S2C2H4)(CO)4(CN)2]2- (2)...
April 13, 2018: Journal of Physical Chemistry. A
Kaichen Dong, Yang Deng, Xi Wang, Kyle B Tom, Zheng You, Jie Yao
Dissipative loss in optical materials is considered one of the major challenges in nano-optics. Here we show that, counter-intuitively, a large imaginary part of material permittivity contributes positively to subwavelength light enhancement and confinement. The Purcell factor and the fluorescence enhancement of dissipative dielectric bowtie nanoantennas, such as Si in ultraviolet (UV), are demonstrated to be orders of magnitude higher than their lossless dielectric counterparts, which is particularly favorable in deep UV applications where metals are plasmonically inactive...
April 15, 2018: Optics Letters
Tran Trung Luu, Valerio Scagnoli, Susmita Saha, Laura J Heyderman, Hans Jakob Wörner
Coherent extreme ultraviolet (EUV) radiation using high-harmonic generation (HHG) in α-quartz is demonstrated from 10 to 200 kHz, using 50 fs laser pulses at the center wavelength of 1030 nm. The EUV radiation extends beyond 25 eV in the nondamaging regime. The number of photons generated in a single harmonic order at 15.6 eV is measured to be ≈(3.5±2.5)×1010 per second which, to the best of our knowledge, is a first and record value reported to date using EUV HHG from solids. This Letter demonstrates one of the first all-solid-state EUV sources based on industrial-grade fiber lasers, enabling the possibility of bringing reliable EUV sources to the mass market...
April 15, 2018: Optics Letters
I S Evstigneeva, A G Kulikov, O V Yarustovskaya, A S Shakhova, M G Lutoshkina
This article describes the modern approaches to the application of physical factors for the treatment of various forms of psoriasis taking into consideration the severity of clinical manifestations and the phase of the disease, the extent of disturbances of the functional state of different organs. The principles of prescription of physiotherapeutictreatmnt are formulated taking account of the stages and forms of the disease. Special attention is paid to the high therapeutic effectiveness of ultraviolet irradiation of the skin including narrow-band UVВ (311 nm) as well as to photodynamic therapy (PUVA), intravenous laser irradiation of blood, and ozone therapy...
April 9, 2018: Voprosy Kurortologii, Fizioterapii, i Lechebnoĭ Fizicheskoĭ Kultury
Bahareh Movafegh, Razieh Jalal, Zobeideh Mohammadi
OBJECTIVE: Cell resistance to doxorubicin and its toxicity to healthy tissue reduce its efficiency. The use of cell penetrating peptides as drug delivery system along with doxorubicin is a strategy to reduce its side effects. In this study, the influence of poly-L-arginine on doxorubicin cytotoxicity, its cellular uptake and doxorubicin-induced apoptosis on human prostate cancer DU145 cells are assessed. METHODS: The cytotoxicity of doxorubicin and poly-L-arginine, alone and in combination, in DU145 cells was evaluated at different exposure times using MTT assay...
April 11, 2018: Anti-cancer Agents in Medicinal Chemistry
Shupei Jin, Yinghua Qiao, Jun Xing
In this study, a ternary mixed-mode silica sorbent (TMSS) with octamethylene, carboxyl, and amino groups was prepared via Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) click reaction and a subsequent reduction of azide to primary amine. While used in solid-phase extraction (SPE), the retention behavior of TMSS towards a total of nine kinds of basic, neutral, and acidic drugs was investigated in detail. The results revealed that hydrophobic, ion-exchange interaction, and electrostatic repulsion between TMSS and the analytes were closely related to the retention behavior of TMSS...
April 13, 2018: Analytical and Bioanalytical Chemistry
Debadrita Paria, Hyeon-Ho Jeong, Vaisakh Vadakkumbatt, Preeti Deshpande, Peer Fischer, Arindam Ghosh, Ambarish Ghosh
The weak light-matter interaction in graphene can be enhanced with a number of strategies, among which sensitization with plasmonic nanostructures is particularly attractive. This has resulted in the development of graphene-plasmonic hybrid systems with strongly enhanced photodetection efficiencies in the visible and the IR, but none in the UV. Here, we describe a silver nanoparticle-graphene stacked optoelectronic device that shows strong enhancement of its photoresponse across the entire UV spectrum. The device fabrication strategy is scalable and modular...
April 13, 2018: Nanoscale
Traci L Johnson, Jane R Rigby, Keren Sharon, Michael D Gladders, Michael Florian, Matthew B Bayliss, Eva Wuyts, Katherine E Whitaker, Rachael Livermore, Katherine T Murray
We present measurements of the surface density of star formation, the star-forming clump luminosity function, and the clump size distribution function, for the lensed galaxy SGAS J111020.0+645950.8 at a redshift of z =2.481. The physical size scales that we probe, radii r = 30-50 pc, are considerably smaller scales than have yet been studied at these redshifts. The star formation surface density we find within these small clumps is consistent with surface densities measured previously for other lensed galaxies at similar redshift...
July 10, 2017: Astrophysical Journal. Letters
Weiguang Ran, Hyeon Mi Noh, Sung Heum Park, Byung Kee Moon, Jung Hyun Jeong, Jung Hwan Kim, Jinsheng Shi
Eu3+ doped CdMoO4 super red emission phosphors with charge compensation were prepared by the traditional high temperature solid-state reaction method in air atmosphere. The interrelationships between photoluminescence properties and crystalline environments were investigated in detail. The 3D network structure which composed by CdO8 and MoO4 polyhedra can collect and efficiently transmit energy to Eu3+ luminescent centers. The relative distance between Eu3+ ions decreased and energy interaction increased sharply with the appearance of interstitial occupation of O2- ions ([Formula: see text])...
April 12, 2018: Scientific Reports
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