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https://www.readbyqxmd.com/read/28651288/development-of-a-high-performance-liquid-chromatographic-method-for-asiaticoside-quantification-in-different-skin-layers-after-topical-application-of-a-centella-asiatica-extract
#1
Priscila Bianca Rodrigues da Rocha, Bruno Dos Santos Souza, Lígia Marquez Andrade, Ricardo Neves Marreto, Eliana Martins Lima, Stephânia Fleury Taveira
The topical application of Centella asiatica extract has been commonly used for many different purposes but especially for cosmetic use in the treatment of gynoid lipodystrophy. Asiaticoside, the most active component in this extract, is responsible for its therapeutic activities. However, little is known to date about asiaticoside skin penetration. Thus, an analytical method for asiaticoside quantification in different skin layers after the topical application of C. asiatica extract was developed and skin permeation studies were performed with the plant extract to apply the analytical method developed...
June 26, 2017: Planta Medica
https://www.readbyqxmd.com/read/28651076/application-of-water-assisted-ultraviolet-light-in-combination-of-chlorine-and-hydrogen-peroxide-to-inactivate-salmonella-on-fresh-produce
#2
Shuanghuan Guo, Runze Huang, Haiqiang Chen
With the demand for fresh produce increases in recent decades, concerns for microbiological safety of fresh produce are also raised. To identify effective ultraviolet (UV) light treatment for fresh produce decontamination, we first determined the effect of three forms of UV treatment, dry UV (samples were treated by UV directly), wet UV (samples were dipped in water briefly and then exposed to UV), and water-assisted UV (samples were treated by UV while being immersed in agitated water) on inactivation of Salmonella inoculated on tomatoes and fresh-cut lettuce...
June 19, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28650610/defect-emission-and-optical-gain-in-sicxoy-h-films
#3
Zhenxu Lin, Hongfei Li, Rui Huang, Yi Zhang, Jie Song, Hongliang Li, Yanqing Guo, Chao Song, John Robertson
Luminescent SiCxOy:H films,which are fabricated at different CH4 flow rates using very high-frequency plasma-enhanced chemical vapor deposition technique, exhibit strong photoluminescence (PL) with tuning from near-infrared to orange regions. The PL features an excitation wavelength independent recombination dynamic. The silicon dangling bond (DB) defects identified by electron paramagnetic resonance spectra are found to play a key role in the PL behavior. The first-principles calculation shows that the Si DB defects introduce a mid-gap state in the band gap, which is in good agreement with the PL energy...
June 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28650497/extreme-ultraviolet-resist-materials-for-sub-7-nm-patterning
#4
Li Li, Xuan Liu, Shyam Pal, Shulan Wang, Christopher K Ober, Emmanuel P Giannelis
Continuous ongoing development of dense integrated circuits requires significant advancements in nanoscale patterning technology. As a key process in semiconductor high volume manufacturing (HVM), high resolution lithography is crucial in keeping with Moore's law. Currently, lithography technology for the sub-7 nm node and beyond has been actively investigated approaching atomic level patterning. EUV technology is now considered to be a potential alternative to HVM for replacing in some cases ArF immersion technology combined with multi-patterning...
June 26, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28650148/mgzno-zno-two-dimensional-electron-gas-photodetectors-fabricated-by-rf-sputtering
#5
J D Hwang, C C Yang, C M Chu
MgZnO/ZnO two-dimensional electron gas (2DEG) structures with ZnO annealed at various temperatures (600-900 ºC) and photodetectors (PDs) with and without a 2DEG structure were fabricated using a radio-frequency magnetron sputtering system. It was found that the carrier concentration and mobility increase with the annealing temperature owing to the improved crystalline in ZnO; however, high-temperature (800 ºC or higher) annealing can degrade the crystalline of the ZnO layer. Hall measurements showed that compared with bulk ZnO, the sheet carrier concentration of the 2DEG sample increased from 1...
June 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28650054/long-pulse-laser-launch-and-ionization-of-tailored-large-neutral-silver-nanoparticles-with-atomic-mass-assignment
#6
A Gallego, U Sezer, M Arndt, M Mayor
We explore the synthesis, characterization, neutral launch and vacuum ultraviolet ionization of massive perfluorinated-alkyl-capped nanoparticles. The presence of the ligand coating in solution is corroborated by Fourier transform infrared spectroscopy (FT-IR) and the particle size distribution is analyzed by transmission electron microscopy (TEM). Matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry identifies perfluoralkyl coated silver nanoparticles as the most stable species among the materials studied here...
June 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28650025/photocatalytic-activity-of-silicon-based-nanoflakes-for-the-decomposition-of-nitrogen-monoxide
#7
Hiroshi Itahara, Xiaoyong Wu, Haruo Imagawa, Shu Yin, Kazunobu Kojima, Shigefusa F Chichibu, Tsugio Sato
The photocatalytic decomposition of nitrogen monoxide (NO) was achieved for the first time using Si-based nanomaterials. Nanocomposite powders composed of Si nanoflakes and metallic particles (Ni and Ni3Si) were synthesized using a simple one-pot reaction of layered CaSi2 and NiCl2. The synthesized nanocomposites have a wide optical absorption band from the visible to the ultraviolet. Under the assumption of a direct transition, the photoabsorption behavior is well described and an absorption edge of ca. 1...
June 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28649975/fabrication-of-algan-nanorods-with-different-al-compositions-for-emission-enhancement-in-uv-range
#8
Jiangping Dai, Bin Liu, Zhe Zhuang, Guotang He, Ting Zhi, Tao Tao, Qingjun Xu, Yi Li, Haixiong Ge, Zili Xie, Rong Zhang
Highly ordered AlxGa1-xN nanorods with varied aluminum alloy compositions (0.18≤x≤0.8) are fabricated with nanoimprint lithography and top-down dry etching techniques. And the structural properties and morphology are obtained by scanning electron microscopy(SEM) and transmission electron microscopy(TEM). Compared with as-grown AlGaN samples, nanorod samples reveal outstanding optical performance on account of strain releasing and light extraction enhancement. Through Raman scattering and Cathodeluminescence measurements, it has been observed clear red-shifts of E2h modes and near band edge emission(NBE) peaks of AlGaN nanorods compared to the planar ones, indicating the residual strain releasing after nano-fabrication...
June 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28649959/employment-of-gold-coated-silver-nanowires-as-transparent-conductive-electrode-for-organic-light-emitting-diodes
#9
Sunho Kim, Bongsung Kim, Inseob Im, Dongjae Kim, Haeseong Lee, Jaewook Nam, Ho Kyoon Chung, Hoo-Jeong Lee, Sungmin Cho
This study proposes a simple method of Au coating on silver nanowires (Ag NWs) transparent conductive films as the anode of organic light emitting diodes (OLED) to increase the work function of the film and thus enhance hole transport. We carefully engineer the process conditions (pretreatment, solution concentrations, and coating number) of the coating using a diluted HAuCl4 solution on the Ag NWs film to minimize etching damage on Ag NWs accompanying the galvanic replacement reaction. Ultraviolet photoelectron spectroscopy (UPS) and Kelvin probe force microscopy (KPFM) show work function increase of Ag NWs upon Au coating...
June 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28649957/the-effect-of-self-depleting-in-uv-photodetector-based-on-simultaneously-fabricated-tio2-nio-pn-heterojunction-and-ni-au-composite-electrode
#10
Dezhong Zhang, Chunyu Liu, Ruiliang Xu, Bo Yin, Yu Chen, Xindong Zhang, Fengli Gao, Shengping Ruan
A novel dark self-depleting ultraviolet (UV) photodetector basing on the TiO2/NiO pn heterojunction was demonstrated with lower dark current (Idark) and noise. The NiO layer and Ni/Au composite electrode were fabricated by the smart one-step oxidation method, which was firstly employed in the fabrication of UV photodetector. In dark, the depleted pn heterojunction structure could effectively reduce the majority carrier density in TiO2/NiO films, demonstrating high resistance state, which contributed to the lower Idark of 0...
June 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28649681/bio-inspired-colorful-flexible-defrostable-light-scattering-hybrid-films-for-the-effective-distribution-of-led-light
#11
Seongpil An, Hong Seok Jo, Yong Il Kim, Kyo Yong Song, Min-Woo Kim, Kyu Bum Lee, Alexander L Yarin, Sam S Yoon
Bioluminescent jellyfish has a unique structure derived from fiber/polymer interfaces that is advantageous for effective light scattering in the dark, deep sea water. Herein, we demonstrate the fabrication of bio-inspired hybrid films by mimicry of the jellyfish's structure, leading to excellent light-scattering performance and defrosting capability. A haze value reaching 59.3% and a heating temperature of up to 292 °C were achieved with the films. Accordingly, the developed surface constitutes an attractive optical device for lighting applications, especially for street or vehicle luminaries for freezing Arctic-climate countries...
June 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28649007/polypharmacy-and-sun-exposure-implications-for-mitochondrial-dna-deletions-in-skin
#12
Julia Montelin Powers, Gillian Murphy, Nikki Ralph, Susan M O'Gorman, James E J Murphy
Most somatic cells contain many copies of mitochondrial DNA (mtDNA). Because of both the high copy number and the lack of repair mechanisms available to mtDNA, damage to it largely goes unrepaired, and can accumulate over time. Large scale deletions are a recognised type of damage sustained by mtDNA as a consequence of exposure to the ultraviolet light in sunlight. A group of patients were identified as having abnormally high levels of either a 4977 base pair deletion (mtDNA(4977)) or 3895 base pair deletion (mtDNA(3895)), in mtDNA from sun exposed skin or skin suspected to be a non-melanoma skin cancer, but not in their non-sun exposed skin biopsies...
June 17, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28648622/a-novel-antimicrobial-therapy-for-the-control-of-aeromonas-hydrophila-infection-in-aquaculture-using-marine-polysaccharide-coated-gold-nanoparticle
#13
Sekar Vijayakumar, Baskaralingam Vaseeharan, Balasubramanian Malaikozhundan, Narayanan Gobi, Samuthirapandian Ravichandran, Sellamuthu Karthi, Balasubramaniem Ashok Kumar, Natesan Sivakumar
In the present study, we prepared fucoidan coated Au-NPs, known as gold nanoparticles of fucoidan (Fu-AuNPs), and examined its effect on the antimicrobial activity against Aeromonas hydrophila. The green synthesized Fu-AuNPs were bio-physically characterized by Ultraviolet-visible (UV-Vis) spectroscopy, X-ray Diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), Higher Transmission Electron Microscopy (HR-TEM), Zeta potential analysis and Energy Dispersive X-ray spectroscopy (EDX). Fu-AuNPs were crystalline in nature, spherical to triangular in shape, with particle size ranging within 10-100 nm...
June 22, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28648293/light-based-technologies-for-microbial-inactivation-of-liquids-bead-surfaces-and-powdered-infant-formula
#14
Cristina Arroyo, Anna Dorozko, Edurne Gaston, Michael O'Sullivan, Paul Whyte, James G Lyng
This study evaluates the potential of continuous wave Ultraviolet C light (UV-C) and broad-spectrum intense pulsed light (in this study referred to as High Intensity Light Pulses, HILP) for the inactivation of pathogens of public concern in powdered infant formula (PIF) producers. To achieve this goal a sequential set of experiments were performed, firstly in clear liquid media, secondly on the surface of spherical beads under agitation and, finally in PIF. L. innocua was the most sensitive microorganism to both technologies under all conditions studied with reductions exceeding 4 log10 cycles in PIF...
October 2017: Food Microbiology
https://www.readbyqxmd.com/read/28647878/selection-of-zygosaccharomyces-rouxii-strains-resistant-to-cadmium-with-improved-removal-abilities-through-ultraviolet-diethyl-sulfate-cooperative-mutagenesis
#15
Yu Liu, Ying Xu, Dongfeng Wang, Wei Jiang
Cd(2+) resistance and bioaccumulation capacity were selected from parental Zygosaccharomyces rouxii (CRZ-0) while maintaining NaCl tolerance using protoplast mutagenesis technology. Ultraviolet-diethyl sulfate (UV-DES) cooperative mutagenesis, followed by preliminary screening and rescreening, was used to select the mutant strain CRZ-9. CRZ-9 grew better than CRZ-0 in YPD medium with 20 or 50 mg L(-1) of Cd(2+). Scanning electron microscopy observations and flow cytometry tests indicated that CRZ-9 was more effective at eliminating reactive oxygen species (ROS) generated by Cd(2+), which led to less cellular structural damage and lower lethality...
June 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28647237/developing-a-chloramine-decay-index-to-understand-nitrification-a-case-study-of-two-chloraminated-drinking-water-distribution-systems
#16
Sina Moradi, Sanly Liu, Christopher W K Chow, John van Leeuwen, David Cook, Mary Drikas, Rose Amal
The management of chloramine decay and the prevention of nitrification are some of the critical issues faced by water utilities that use chloramine as a disinfectant. In this study, potential association between high performance size exclusion chromatography (HPSEC) data obtained with multiple wavelength Ultraviolet (UV) detection from two drinking water distribution systems in Australia and nitrification occurrence was investigated. An increase in the absorbance signal of HPSEC profiles with UV detection at λ=230nm between apparent molecular weights of 200 to 1000Da was observed at sampling sites that experienced rapid chloramine decay and nitrification while its absorbance signal at λ=254nm decreased...
July 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28647228/chloramine-demand-estimation-using-surrogate-chemical-and-microbiological-parameters
#17
Sina Moradi, Sanly Liu, Christopher W K Chow, John van Leeuwen, David Cook, Mary Drikas, Rose Amal
A model is developed to enable estimation of chloramine demand in full scale drinking water supplies based on chemical and microbiological factors that affect chloramine decay rate via nonlinear regression analysis method. The model is based on organic character (specific ultraviolet absorbance (SUVA)) of the water samples and a laboratory measure of the microbiological (Fm) decay of chloramine. The applicability of the model for estimation of chloramine residual (and hence chloramine demand) was tested on several waters from different water treatment plants in Australia through statistical test analysis between the experimental and predicted data...
July 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28647144/simultaneous-determination-of-uv-filters-and-estrogens-in-aquatic-invertebrates-by-modified-quick-easy-cheap-effective-rugged-and-safe-extraction-and-liquid-chromatography-tandem-mass-spectrometry
#18
Ke He, Anne Timm, Lee Blaney
Ultraviolet-filters (UV-filters) and estrogens have attracted increased attention as contaminants of emerging concern (CECs) due to their widespread occurrence in the environment. Most of these CECs are hydrophobic and have the potential to accumulate in aquatic organisms. To date, co-analysis of UV-filters and estrogens has not been reported due, in part, to the complex environmental matrices. Here, a multi-residue method has been developed for simultaneous determination of five UV-filters and three estrogens in tissue from aquatic and marine organisms...
June 15, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28646736/cell-damage-caused-by-ultraviolet-b-radiation-in-the-desert-cyanobacterium-phormidium-tenue-and-its-recovery-process
#19
Gaohong Wang, Songqiang Deng, Jiafeng Liu, Chaoran Ye, Xiangjun Zhou, Lanzhou Chen
Phormidium tenue, a cyanobacterium that grows in the topsoil of biological soil crusts (BSCs), has the highest recovery rate among desert crust cyanobacteria after exposure to ultraviolet B (UV-B) radiation. However, the mechanism underlying its recovery process is unclear. To address this issue, we measured chlorophyll a fluorescence, generation of reactive oxygen species (ROS), lipid peroxidation, and repair of DNA breakage in P. tenue following exposure to UV-B. We found that UV-B radiation at all doses tested reduced photosynthesis and induced cell damage in P...
June 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28645148/a-soft-environmental-control-effect-of-apatite-doped-with-mineral-traces-in-the-fowl-droppings
#20
M Minamisawa, T Taniai, S Yoshida
Fowl-dropping apatite (Ca10-z[PO4]6-z[OH]2-z) synthesized from carbonized, incinerated fowl droppings contains PO4 and OH groups that are partially substituted by CO32- ions. It shows stronger ion conductivity than commercially available hydroxyapatite in a wide range of temperatures from 23°C to 800°C. Fowl-dropping apatite readily adsorbs NO2 and SO2 gases and, without re-releasing these gases, slowly decomposes them at room temperature under sunlight via ultraviolet-visible (UV-Vis) irradiation. A limited amount of minerals and organics contained in fowl droppings causes light-induced activities in fowl-dropping apatite with a crystal structure that has a developed c face; this initiates excitation-induced atomic transfer on the solid surface derived from PO4 exposed on the c face, which then advances the decomposition reaction...
June 21, 2017: Poultry Science
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