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https://www.readbyqxmd.com/read/28641206/efficacy-of-surgical-laser-therapy-in-the-management-of-oral-pigmented-lesions-a-systematic-review
#1
Tariq Abduljabbar, Fahim Vohra, Zohaib Akram, Siti Mariam Ab Ghani, Nawwaf Al-Hamoudi, Fawad Javed
BACKGROUND: Oral pigmentation, especially in the gingiva poses esthetic problems. Laser therapy has been widely used for cosmetic therapy in dentistry. The aim of the present study was to systematically review the efficacy of surgical laser therapy (SLT) in the management of oral pigmented lesions (OPL). MATERIALS AND METHODS: The addressed focused question was "Is SLT effective in the management of OPL?" Databases (MEDLINE via PubMed; EMBASE; Cochrane Central Register of Controlled Trials and Cochrane Oral Health Group Trials Register databases) were searched from 1970 up to and including February 2017...
June 15, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28641009/metal-halide-perovskites-as-mixed-electronic-ionic-conductors-challenges-and-opportunities-from-hysteresis-to-memristivity
#2
Wolfgang Tress
Metal halide perovskites are promising candidates for many classes of different optoelectronic devices. Apart from being a semiconductor, they additionally show ionic conductivity. It expresses itself in slow response times, reversible degradation, and hysteresis in the current-voltage characteristics of solar cells. This Perspective gives a condensed overview about experiments and theory on ion migration in metal halide perovskites focusing on its effects in solar cells. Apart from being a potential stability concern for photovoltaics, ion migration paired with the excellent optoelectronic properties of this material offers opportunities for novel devices such as optically controlled memristors and switchable diodes...
June 22, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28636314/giant-thermal-rectification-from-single-carbon-nanotube-graphene-junction
#3
Xueming Yang, Dapeng Yu, Bingyang Cao
We describe the influence of the geometry parameters on the thermal rectification of single carbon nanotube-graphene junction. The two-dimensional (2D) distribution of the thermal rectification with respect to the tube length and the side length of the graphene nanosheet are calculated and visualized. The maximum thermal rectification ratios of the designed single carbon nanotube-graphene junction can reach 1244.1% and 1681.6% at average temperatures of 300 K and 200 K, respectively. These values are much higher than those reported for single-material nanostructure-based thermal rectifiers...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28635629/light-emitting-marker-for-robust-vision-based-on-the-spot-bacterial-growth-detection
#4
Kyukwang Kim, Jieum Hyun, Jessie S Jeon
Simple methods using the striped pattern paper marker and FFT (fast Fourier transformation) have been proposed as alternatives to measuring the optical density for determining the level of bacterial growth. The marker-based method can be easily automated, but due to image-processing-base of the method, the presence of light or the color of the culture broth can disturb the detection process. This paper proposes a modified version of marker-FFT-based growth detection that uses a light emitting diode (LED) array as a marker...
June 21, 2017: Sensors
https://www.readbyqxmd.com/read/28634385/vertical-and-bevel-structured-sic-etching-techniques-incorporating-different-gas-mixture-plasmas-for-various-microelectronic-applications
#5
Ho-Kun Sung, Tian Qiang, Zhao Yao, Yang Li, Qun Wu, Hee-Kwan Lee, Bum-Doo Park, Woong-Sun Lim, Kyung-Ho Park, Cong Wang
This study presents a detailed fabrication method, together with validation, discussion, and analysis, for state-of-the-art silicon carbide (SiC) etching of vertical and bevelled structures by using inductively coupled plasma reactive ion etching (ICP-RIE) for microelectronic applications. Applying different gas mixtures, a maximum bevel angle of 87° (almost vertical), large-angle bevels ranging from 40° to 80°, and small-angel bevels ranging from 7° to 17° were achieved separately using distinct gas mixtures at different ratios...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28633698/feasibility-of-a-streamlined-tuberculosis-diagnosis-and-treatment-initiation-strategy
#6
P B Shete, T Nalugwa, K Farr, C Ojok, M Nantale, P Howlett, P Haguma, E Ochom, F Mugabe, M Joloba, L H Chaisson, D W Dowdy, D Moore, J L Davis, A Katamba, A Cattamanchi
OBJECTIVE: To assess the feasibility of a streamlined strategy for improving tuberculosis (TB) diagnostic evaluation and treatment initiation among patients with presumed TB. DESIGN: Single-arm interventional pilot study at five primary care health centers of a streamlined, SIngle-saMPLE (SIMPLE) TB diagnostic evaluation strategy: 1) examination of two smear results from a single spot sputum specimen using light-emitting diode fluorescence microscopy, and 2) daily transportation of smear-negative sputum samples to Xpert® MTB/RIF testing sites...
July 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28633099/simultaneous-and-specific-enrichment-of-several-amphenicol-antibiotics-residues-in-food-based-on-novel-aptamer-functionalized-magnetic-adsorbents-using-hplc-dad
#7
Shengfeng Huang, Ning Gan, Haibo Liu, You Zhou, Yinji Chen, Yuting Cao
In this work, a novel aptamer functionalized magnetic adsorbent was developed and combined with magnetic dispersive solid phase extraction (MDSPE) for selective enrichment of several amphenicol antibiotics residues (chloramphenicol(CAP), thiamphenicol(TAP) and florphenicol(FF)) in foodstuff then determined by High Performance Liquid Chromatography (HPLC)-Diode array detector(DAD). Firstly, a magnetic silica-coated Fe3O4 microsphere(Fe3O4@SiO2) was synthetized by sol-gel method, then it was functionalized by amino groups through 3-Aminopropyltriethoxysilane (APTES) reagent to form Fe3O4@SiO2-NH2; Thirdly, the amino group on Fe3O4@SiO2-NH2 was transferred to carboxylic group via the succinic anhydride to form Fe3O4@SiO2-COOH...
June 12, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28632989/impact-of-interface-mixing-on-the-performance-of-solution-processed-organic-light-emitting-diodes-impedance-and-ultraviolet-photoelectron-spectroscopy-study
#8
Dong A Ahn, Seungjun Lee, JaeGwan Chung, Yongsup Park, Min Chul Suh
We investigated interfacial mixing of solution-processed organic light-emitting devices (OLEDs) using impedance spectroscopy (IS) and ultraviolet photoelectron spectroscopy (UPS) and its impact on device performance. We focused on interfacial mixing between a solution-processed cross-linkable hole transport layer (XM) and an emitting layer (EML), formed either by solution processing or vacuum evaporation. The results of IS and UPS clearly indicated that extensive interfacial mixing was unavoidable, even after the XM was cross-linked to make it insoluble and rinsed to remove residual soluble species, if the subsequent EML was solution processed...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28632988/solid-sampling-with-a-diode-laser-for-portable-ambient-mass-spectrometry
#9
Yeni P Yung, Raveendra Wickramasinghe, Anu Vaikkinen, Tiina Johanna Kauppila, Igor V Veryovkin, Luke Hanley
A handheld diode laser is implemented for solid sampling in portable ambient mass spectrometry (MS). Specifically, a pseudo-continuous wave battery-powered surgical laser diode is employed for portable laser diode thermal desorption (LDTD) at 940 nm and compared with nanosecond pulsed laser ablation at 2940 nm. Postionization is achieved in both cases using atmospheric pressure photoionization (APPI). The laser ablation atmospheric pressure photoionization (LAAPPI) and LDTD-APPI mass spectra of sage leaves (Salvia officinalis) using a field-deployable quadrupole ion trap MS display many similar ion peaks, as do the mass spectra of membrane grown biofilms of Pseudomonas aeruginosa...
June 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28632325/nickelocene-precursor-facilitated-fast-growth-of-graphene-h-bn-vertical-heterostructures-and-its-applications-in-oleds
#10
Qiucheng Li, Zifeng Zhao, Baoming Yan, Xiuju Song, Zhepeng Zhang, Jia Li, Xiaosong Wu, Zuqiang Bian, Xiaolong Zou, Yanfeng Zhang, Zhongfan Liu
The direct growth of high-quality, large-area, uniform, vertically stacked Gr/h-BN heterostructures is of vital importance for applications in electronics and optoelectronics. However, the main challenge lies in the catalytically inert nature of the hexagonal boron nitride (h-BN) substrates, which usually afford a rather low decomposition rate of carbon precursors, and thus relatively low growth rate of graphene. Herein, a nickelocene-precursor-facilitated route is developed for the fast growth of Gr/h-BN vertical heterostructures on Cu foils, which shows much improved synthesis efficiency (8-10 times faster) and crystalline quality of graphene (large single-crystalline domain up to ≈20 µm)...
June 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28631622/highly-flexible-ultra-thin-and-transparent-single-layer-graphene-silver-composite-electrodes-for-organic-light-emitting-diodes
#11
Kun Li, Hu Wang, Huiying Li, Ye Li, Guangyong Jin, LanLan Gao, Mazzeo Marco, Yu Duan
Transparent conductive electrode (TCE) platforms are required in many optoelectronic devices, including organic light emitting diodes (OLEDs). To date, Indium Tin Oxide (ITO) based electrodes are widely used in TCEs but they still have few limitations in term of achieving flexible OLEDs and display techniques. In this paper, highly-flexible and ultra-thin TCEs were fabricated for use in OLEDs by combining single-layer graphene (SLG) with thin silver layers of only several nanometers in thickness. The as-prepared SLG+Ag (8nm) composite electrodes showed low sheet resistances of 9Ω/sq, high stability over 500 bending cycles, and 74% transmittance at 550nm wavelength...
June 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28631480/fully-transparent-quantum-dot-light-emitting-diode-with-a-laminated-top-graphene-anode
#12
Li Yao, Xin Fang, Wei Gu, Wenhao Zhai, Yi Wan, Xixi Xie, Wanjin Xu, Xiaodong Pi, Guangzhao Ran, Guogang Qin
A new method to employ graphene as top electrode was introduced, and based on that, fully transparent quantum dot light emitting diodes (T-QLEDs) were sucessfully fabribated through a lamination process. We adopted the widely used wet transfer method to transfer bilayer graphene (BG) on polydimethylsiloxane/polyethylene terephthalate (PDMS/PET) substrate. The sheet resistance of graphene reduced to ~540 Ω/□ through transferring BG for 3 times on the PDMS/PET. The T-QLED has an inverted device structure of glass/Indium tin oxide (ITO)/ZnO nanoparticles (NPs)/(CdSSe/ZnS quantum dots (QDs))/ 1,1-bis[(di-4-tolylamino)phenyl] cyclohexane (TAPC)/MoO3/ graphene/PDMS/PET...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28631264/targeted-use-of-leds-in-improvement-of-production-efficiency-through-phytochemical-enrichment
#13
REVIEW
E Taulavuori, K Taulavuori, J K Holopainen, R Julkunen-Tiitto, C Acar, I Dincer
Based on available literature, ecology and economy of LED (light emitting diode) lights in plant foods production were assessed and compared to HPS (high pressure sodium) and CFL (compact fluorescent light) lamps. The assessment summarises that LEDs are superior compared to other lamp types. LEDs are ideal in luminous efficiency, life span and electricity usage. Mercury, carbon dioxide and heat emissions are also lowest in comparison to HPS and CFL lamps. This indicates that LEDs are indeed economic and eco-friendly lighting devices...
June 20, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28630625/quantification-of-antioxidant-phenolic-compounds-in-a-new-chrysanthemum-cultivar-by-high-performance-liquid-chromatography-with-diode-array-detection-and-electrospray-ionization-mass-spectrometry
#14
Ah-Reum Han, Hyo Young Kim, Yangkang So, Bomi Nam, Ik-Soo Lee, Joo-Won Nam, Yeong Deuk Jo, Sang Hoon Kim, Jin-Baek Kim, Si-Yong Kang, Chang Hyun Jin
The flowers of Chrysanthemum morifolium Ramat. have been used as an herbal tea and in traditional medicine, and the plant has been developed to produce horticultural cultivars of various colors and shapes. In this study, a new chrysanthemum cultivar with dark purple petals (C. morifolium cv. ARTI-Dark Chocolate; ADC) was developed by radiation-induced mutation breeding of its original cultivar with purple striped white petals (C. morifolium cv. Noble Wine, NW). The phenolic profile and antioxidant property of ADC were investigated and compared with NW and the commercially available medicinal herb, C...
2017: International Journal of Analytical Chemistry
https://www.readbyqxmd.com/read/28629848/a-novel-intrinsic-electroretinogram-response-in-isolated-mouse-retina
#15
Motoharu Takao, Yumi Fukuda, Takeshi Morita
Since the discovery of intrinsic photosensitive retinal ganglion cell (ipRGC) was reported in 2002, many features specific to this cell type have been described. However, scare information is available on the retinographic components directly reflecting ipRGC activity. In this study, we identified the electroretinogram (microERG) that reflects the photoresponses by ipRGCs in ex vivo preparations of the mouse retina, in which classical photoreceptors (cones and rods) were ablated mechanically and photochemically...
June 16, 2017: Neuroscience
https://www.readbyqxmd.com/read/28628879/development-of-a-method-for-the-characterization-and-operation-of-uv-led-for-water-treatment
#16
Ataollah Kheyrandish, Madjid Mohseni, Fariborz Taghipour
Tremendous improvements in semiconductor technology have made ultraviolet light-emitting diodes (UV-LEDs) a viable alternative to conventional UV sources for water treatment. A robust and validated experimental protocol for studying the kinetics of microorganism inactivation is key to the further development of UV-LEDs for water treatment. This study proposes a protocol to operate UV-LEDs and control their output as a polychromatic radiation source. In order to systematically develop this protocol, the results of spectral power distribution, radiation profile, and radiant power measurements of a variety of UV-LEDs are presented...
June 6, 2017: Water Research
https://www.readbyqxmd.com/read/28628685/a-systematic-review-of-light-emitting-diode-led-phototherapy-for-treatment-of-psoriasis-an-emerging-therapeutic-modality
#17
Derek Ho, Eugene Koo, Andrew Mamalis, Jared Jagdeo
<p>Background: Psoriasis is a chronic, inflammatory skin condition. The economic burden of psoriasis is approximately $35.2 billion in the United States per year, and treatment costs are increasing at a higher rate than general inflation. Light emitting diode (LED) phototherapy may represent a cost-effective, efficacious, safe, and portable treatment modality for psoriasis.</p> <p>Objective: The goal of our manuscript is to review the published literature and provide evidence-based recommendations on LED phototherapy for the treatment of psoriasis...
May 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28627894/surface-functionalization-of-black-phosphorus-via-potassium-toward-high-performance-complementary-devices
#18
Cheng Han, Zehua Hu, Lidia C Gomes, Yang Bao, Alexandra Carvalho, Sherman J R Tan, Bo Lei, Du Xiang, Jing Wu, Dianyu Qi, Li Wang, Fengwei Huo, Wei Huang, Kian Ping Loh, Wei Chen
Two-dimensional black phosphorus configured field-effect transistor devices generally show a hole-dominated ambipolar transport characteristic, thereby limiting its applications in complementary electronics. Herein, we demonstrate an effective surface functionalization scheme on few-layer black phosphorus, through in situ surface modification with potassium, with a view toward high performance complementary device applications. Potassium induces a giant electron doping effect on black phosphorus along with a clear bandgap reduction, which is further corroborated by in situ photoelectron spectroscopy characterizations...
June 22, 2017: Nano Letters
https://www.readbyqxmd.com/read/28627416/a-combined-application-of-tunable-diode-laser-absorption-spectroscopy-and-isothermal-micro-calorimetry-for-calorespirometric-analysis
#19
David Brueckner, Anna Solokhina, Stephan Krähenbühl, Olivier Braissant
Calorespirometry is the simultaneous analysis of the rate of heat emission (Rq), O2 consumption (RO2) and CO2 production (RCO2) by living systems such as tissues or organism cultures. The analysis provides useful knowledge about thermodynamic parameters relevant for e.g. biotechnology where parameter based yield maximization (fermentation) is relevant. The determination of metabolism related heat emission is easy and normally done by a calorimeter. However, measuring the amount of consumed O2 and produced CO2 can be more challenging, as additional preparation or instrumentation might be needed...
June 13, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/28626456/bactericidal-effect-of-photodynamic-therapy-alone-or-in-combination-with-mupirocin-or-linezolid-on-staphylococcus-aureus
#20
Vanesa Pérez-Laguna, Luna Pérez-Artiaga, Verónica Lampaya-Pérez, Isabel García-Luque, Sofía Ballesta, Santi Nonell, Manuel P Paz-Cristobal, Yolanda Gilaberte, Antonio Rezusta
Antibiotic treatments frequently fail due to the development of antibiotic resistance, underscoring the need for new treatment strategies. Antimicrobial photodynamic therapy (aPDT) could constitute an alternative therapy. In bacterial suspensions of Staphylococcus aureus, which is commonly implicated in cutaneous and mucosal infections, we evaluated the in vitro efficacy of aPDT, using the photosensitizing agents rose bengal (RB) or methylene blue (MB), alone or combined with the antibiotics mupirocin (MU) or linezolid (LN)...
2017: Frontiers in Microbiology
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