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https://www.readbyqxmd.com/read/28742328/attachable-pulse-sensors-integrated-with-inorganic-optoelectronic-devices-for-monitoring-heart-rates-at-various-body-locations
#1
Juho Kim, Namyun Kim, Minjeong Kwon, Jongho Lee
Monitoring cardiovascular signals such as heart rate and blood flow provides critically important healthcare information about patients under medical care. However, when the sensors are worn for extended times, the sensors sometimes require higher mechanical compatibility with soft deformable tissues. In this paper, we report an attachable and flexible pulse sensor (bending radius: 2.4 mm), integrated with micro-inorganic photodetectors (thickness: 4.1 μm, photocurrent: 8.99 μA under 1.5 mW/cm(2)) and a red light emitting diode (620 nm), to monitor vital signals for extended times...
July 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28741866/a-review-of-available-laser-and-intense-light-source-home-devices-a-dermatologist-s-perspective
#2
REVIEW
Margit Lw Juhász, Melissa K Levin, Ellen S Marmur
BACKGROUND: Home optical devices are becoming an increasingly popular treatment modality sought out by patients for dermatologic pathologies such as acne, hair removal and anti-aging, as these devices are a low-cost and convenient therapy choice. METHODS: An Internet search using PubMed.gov was completed with search terms, "home device dermatology," "home device acne," "home device hair" or "hair removal," and "home device aging." RESULTS: Currently, there are multiple home optical devices available on the market...
July 25, 2017: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/28741107/development-and-optimization-of-a-novel-sample-preparation-method-cored-on-functionalized-nanofibers-mat-solid-phase-extraction-for-the-simultaneous-efficient-extraction-of-illegal-anionic-and-cationic-dyes-in-foods
#3
Feifei Qi, Ningge Jian, Liangliang Qian, Weixin Cao, Qian Xu, Jian Li
A simple and efficient three-step sample preparation method was developed and optimized for the simultaneous analysis of illegal anionic and cationic dyes (acid orange 7, metanil yellow, auramine-O, and chrysoidine) in food samples. A novel solid-phase extraction (SPE) procedure based on nanofibers mat (NFsM) was proposed after solvent extraction and freeze-salting out purification. The preferred SPE sorbent was selected from five functionalized NFsMs by orthogonal experimental design, and the optimization of SPE parameters was achieved through response surface methodology (RSM) based on the Box-Behnken design (BBD)...
July 24, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28739272/an-on-line-analytical-approach-for-detecting-haptens-in-shuang-huang-lian-powder-injection
#4
Hong Wang, Xiaotian Zhang, Daidong Wang, Hongyang Sun, Yuexiang Lan, Haixiu Jiang, Shizhong Chen, Zongtao Lin
Shuang-huang-lian powder injection (SHLPI) is a traditional Chinese medicine injection (TCMI) frequently used in the clinical treatment of faucitis, bronchitis, and other viral and bacterial infections of upper respiratory tract. However, its allergenic reactions, being the main adverse effects (AEs) of SHLPI, have been a serious problem of its clinical safety. This problem has not been solved due to short of methods for detecting haptens in complex TCMIs. In this study, an on-line high-performance liquid chromatography-diode-array detector-mass spectrometry combined with bovine serum albumin-fluorescence detector (HPLC-DAD-MS-BSA-FLD) system was established for the first time, validated and applied for identification of haptens in SHLPI...
July 13, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28738603/vortex-assisted-liquid-liquid-liquid-microextraction-followed-by-high-performance-liquid-chromatography-for-the-simultaneous-determination-of-fourteen-phenolic-acids-in-honey-iced-tea-and-canned-coffee-drinks
#5
Marwan Shalash, Ahmad Makahleh, Salizawati Muhamad Salhimi, Bahruddin Saad
A vortex-assisted liquid-liquid-liquid microextraction method followed by high performance liquid chromatography-diode array detection for the determination of fourteen phenolic acids (cinnamic, m-coumaric, chlorogenic, syringic, ferulic, o-coumaric, p-coumaric, vanillic, p-hydroxybenzoic, caffeic, 2, 4-dihydroxybenzoic, sinapic, gentisic and gallic acids) in honey, iced tea and canned coffee drink samples has been developed. The separation was achieved using a Poroshell 120-EC-C18 column under a gradient elution at a flow rate of 0...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28737970/the-photocatalytic-degradation-of-methylene-blue-by-green-semiconductor-films-that-is-induced-by-irradiation-by-a-light-emitting-diode-and-visible-light
#6
Chih-Chi Yang, Ruey-An Doong, Ku-Fan Chen, Giin-Shan Chen, Yung-Pin Tsai
This study develops a low-energy rotating photocatalytic contactor (LE-RPC) that has Cu-doped TiO2 films coated on stainless steel rotating disks, to experimentally evaluate the efficiency of the degradation and decolourization of methylene blue (MB) under irradiation from different light sources (visible 430 nm, LED 460 nm and LED 525 nm). The production of hydroxyl radicals is also examined. The experimental results show that the photocatalytic activity of TiO2 that is doped with Cu(2+)is induced by illumination with visible light and a LED...
July 24, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28737776/therapeutic-salivary-monitoring-of-iv-busulfan-in-patients-undergoing-hematopoietic-stem-cell-transplantation-a-pilot-study
#7
L M Bezinelli, F P Eduardo, D L C de Carvalho, C E Dos Santos Ferreira, E V de Almeida, L R Sanches, I Esteves, P V Campregher, N Hamerschlak, L Corrêa
Individual therapeutic monitoring of busulfan (BU) minimizes its toxicity and improves the therapeutic outcomes during hematopoietic stem cell transplantation (HSCT). For individual dose adjustment, several blood collections are performed that are uncomfortable for patients. The aim of this pilot study was to validate a laboratory method for quantification of BU in saliva and to present the results obtained using this protocol in HSCT patients. We performed analyses of selectivity, precision and accuracy of saliva with standard concentrations of BU using ultra-high-performance liquid chromatography with diode array detection...
July 24, 2017: Bone Marrow Transplantation
https://www.readbyqxmd.com/read/28737402/ultrafast-hot-carrier-dynamics-in-gan-and-its-impact-on-the-efficiency-droop
#8
Vatsal Jhalani, Jin-Jian Zhou, Marco Bernardi
GaN is a key material for lighting technology. Yet, the carrier transport and ultrafast dynamics that are central in GaN light emitting devices are not completely understood. We present first-principles calculations of carrier dynamics in GaN, focusing on electron-phonon (e-ph) scattering and the cooling and nanoscale dynamics of hot carriers. We find that e-ph scattering is significantly faster for holes compared to electrons, and that for hot carriers with an initial 0.5 - 1 eV excess energy, holes take a significantly shorter time (~0...
July 24, 2017: Nano Letters
https://www.readbyqxmd.com/read/28735174/tetherless-near-infrared-control-of-brain-activity-in-behaving-animals-using-fully-implantable-upconversion-microdevices
#9
Ying Wang, Xudong Lin, Xi Chen, Xian Chen, Zhen Xu, Wenchong Zhang, Qinghai Liao, Xin Duan, Xin Wang, Ming Liu, Feng Wang, Jufang He, Peng Shi
Many nanomaterials can be used as sensors or transducers in biomedical research and they form the essential components of transformative novel biotechnologies. In this study, we present an all-optical method for tetherless remote control of neural activity using fully implantable micro-devices based on upconversion technology. Upconversion nanoparticles (UCNPs) were used as transducers to convert near-infrared (NIR) energy to visible light in order to stimulate neurons expressing different opsin proteins. In our setup, UCNPs were packaged in a glass micro-optrode to form an implantable device with superb long-term biocompatibility...
July 12, 2017: Biomaterials
https://www.readbyqxmd.com/read/28733001/degradation-of-endocrine-disruptor-bisphenol-a-by-ultrasound-assisted-electrochemical-oxidation-in-water
#10
Matz Dietrich, Marcus Franke, Michael Stelter, Patrick Braeutigam
Micropollutants are becoming an increasing problem for the environment and wastewater treatment. One example is Bisphenol A (BPA), an endocrinic disruptor, which is widely used in plastic production. Due to its endocrine disrupting effects on aquatic (micro-)organisms and its ubiquity, in surface- and wastewater alike, adequate treatment techniques are necessary. In this study, the degradation of BPA by a sonoelectrochemical hybrid system was investigated, using a low frequency (24kHz) ultrasound horn and two boron doped diamond electrodes...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732963/ultrasonic-assisted-synthesis-of-znte-nanostructures-and-their-structural-electrochemical-and-photoelectrical-properties
#11
P Ilanchezhiyan, G Mohan Kumar, Fu Xiao, S Poongothai, A Madhan Kumar, C Siva, Sh U Yuldashev, D J Lee, Y H Kwon, T W Kang
Colloidal zinc telluride (ZnTe) nanostructures were successfully processed through a simple and facile ultrasonic (sonochemical) treatment for photoelectronic applications. The particle-like morphological features, phase and nature of valence state of various metal ions existing in ZnTe were examined using electron and X-ray photoelectron spectroscopic tools. Raman spectroscopic measurements revealed the dominance of exciton-phonon coupling and occurrence of TeO2 traces in ZnTe through the corresponding vibrations...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732334/does-laser-phototherapy-influence-the-proliferation-of-myoepithelial-cells-in-the-salivary-gland-of-hypothyroid-rats
#12
Virgínia Dias Uzêda-E-Silva, Tania Tavares Rodriguez, Luciana Maria Pedreira Ramalho, Flávia Calo Aquino Xavier, Isabele Cardoso Vieira de Castro, Antônio Luiz Barbosa Pinheiro, Jean Nunes Dos Santos
Thyroid hormones influence both development and growth of organs and tissues and guarantee metabolic demands that interfere with the quality of digestive secretions, including those of the salivary glands. Laser phototherapy - LPT can modulate various biological phenomena and its diverse effects permit the action on different cell types. The aim of this study was to evaluate the influence of laser phototherapy on myoepithelial cells of salivary glands of hypothyroid rats. Forty-two albino Wistar rats were divided into two main groups: euthyroid (EU) and hypothyroid (HYPO)...
July 12, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28731322/large-scale-stretchable-semi-embedded-copper-nanowires-transparent-conductive-films-by-electrospinning-template
#13
Xia Yang, Xiaotian Hu, Qingxia Wang, Jian Xiong, Hanjun Yang, Xiangchuan Meng, Licheng Tan, Lie Chen, Yiwang Chen
With recent emergence of wearable electronic devices, the flexible and stretchable transparent electrodes are the core components to realize innovative devices. Copper nanowires (CuNWs) network is commonly chosen because of its high conductivity and transparency. However, the junction resistances and low aspect ratios still limit its further stretchable performance. Herein, a large-scale stretchable semi-embedded CuNWs transparent conductive film (TCFs) was fabricated by electrolessly depositing Cu on the electrospun poly (4-vinylpyridine) (P4VP) polymer template semi-embedded in polydimethylsiloxane (PDMS)...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28731270/polarized-light-emitting-diodes-based-on-patterned-mos2-nanosheet-hole-transport-layer
#14
Gyu Jin Choi, Quyet Van Le, Kyoung Soon Choi, Ki Chang Kwon, Ho Won Jang, Jin Seog Gwag, Soo Young Kim
Here, this study successfully fabricates few-layer MoS2 nanosheets from (NH4 )2 MoS4 and applies them as the hole transport layer as well as the template for highly polarized organic light-emitting diodes (OLEDs). The obtained material consists of polycrystalline MoS2 nanosheets with thicknesses of 2 nm. The MoS2 nanosheets are patterned by rubbing/ion-beam treatment. The Raman spectra shows that {poly(9,9-dioctylfluorene-alt-benzothiadiazole), poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]thiadiazol-4,8-diyl)]} (F8BT) on patterned MoS2 exhibits distinctive polarization behavior...
July 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28730821/efficient-carrier-to-exciton-conversion-in-field-emission-tunnel-diodes-based-on-mis-type-van-der-waals-heterostack
#15
Shunfeng Wang, Junyong Wang, Weijie Zhao, Francesco Giustiniano, Leiqiang Chu, Ivan Verzhbitskiy, Justin Zhou Yong, Goki Eda
We report on efficient carrier-to-exciton conversion and planar electroluminescence from tunnel diodes based on a metal-insulator-semiconductor (MIS) van der Waals heterostack consisting of few-layer graphene (FLG), hexagonal boron nitride (hBN), and monolayer tungsten disulfide (WS2). These devices exhibit excitonic electroluminescence with extremely low threshold current density of a few pA·μm(-2), which is several orders of magnitude lower compared to the previously reported values for the best planar EL devices...
July 24, 2017: Nano Letters
https://www.readbyqxmd.com/read/28730816/multi-functional-octamethyltetrasila-2-2-cyclophanes-conformational-variations-circularly-polarized-luminescence-and-organic-electroluminescence
#16
Masaki Shimada, Yoshinori Yamanoi, Tatsuhiko Ohto, Song-Toan Pham, Ryo Yamada, Hirokazu Tada, Kenichiro Omoto, Shohei Tashiro, Mitsuhiko Shionoya, Mineyuki Hattori, Keiko Jimura, Shigenobu Hayashi, Hikaru Koike, Munetaka Iwamura, Koichi Nozaki, Hiroshi Nishihara
Both symmetrical and unsymmetrical cyclophanes containing disilane units, tetrasila[2.2]cyclophanes 1-9, were synthesized. The syn and anti conformation and the kinetics of inversion between two anti-isomers were investigated by X-ray diffraction and variable-temperature NMR analysis, respectively. The flipping motion of two aromatic rings was affected by the bulkiness of the aromatic moiety (1 vs 6), the phase (solid vs solution), and the inclusion by host molecules (1 vs 1⊂[Ag2L](2)(+)). The photophysical, electrochemical, and structural properties of the compounds were thoroughly investigated...
July 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28730806/investigation-of-exciton-recombination-zone-in-quantum-dot-light-emitting-diodes-using-a-fluorescent-probe
#17
Xiaoyu Huang, Heng Zhang, Dingxin Xu, Feng Wen, Shuming Chen
Exciton recombination zone, where the photons are generated, can greatly affect the performance such as the efficiency, the color purity of the quantum dot (QD) light-emitting diodes (QLEDs). To probe the exciton recombination zone, 4-(dicyanomethylene)-2-t-butyl-6(1,1,7,7 -tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) is doped into the charge transport layer as a fluorescent sensor; by monitoring the Förster resonant energy transfer (FRET) between QD and DCJTB, the location of the recombination zone can be determined...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28729526/high-performance-surface-modified-tio2-silicone-nanocomposite
#18
Pei Huang, Han-Qiao Shi, Hong-Mei Xiao, Yuan-Qing Li, Ning Hu, Shao-Yun Fu
The mismatch of refractive index (RI) between light emitting diode (LED) chips and packaging resins severely lowers the lighting emitting efficacy of LED. The RI can be enhanced by the introduction of high RI nanoparticles but meanwhile it is a great challenge to maintain the high transparency for resins due to the agglomeration of nanoparticles. In this work, a facile strategy is proposed to fabricate silicone nanocomposites with a high transparency (>88%, less than 2% decrease relative to pure silicone resin), largely enhanced RI (an increase from 1...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28727251/degree-of-conversion-and-cross-link-density-within-a-resin-matrix-composite
#19
Afnan O Al-Zain, George J Eckert, Henry Lukic, Spiro J Megremis, Jeffrey A Platt
The aims of this study were to profile light radiated from two light-curing units (LCUs) and evaluate profile relationship to polymerization patterns within a resin-matrix composite (RMC). Beam profiles of one multiple emission peak light-emitting-diode and one quartz-tungsten-halogen curing-unit were measured using a beam profiler/spectrometer system. A camera-based profiler and an integrating sphere/spectrometer assembly were used to evaluate each LCU beam. Polymerization patterns within a nano-hybrid RMC were investigated using a mapping approach by assessing the degree of conversion utilizing micro-Raman spectroscopy and indirectly estimating cross-link-density by repeated microhardness testing before and after exposure to ethanol (%KH reduction, n = 3)...
July 20, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28726908/mn-4-li-co-doped-srmgal10o17-phosphor-in-glass-application-in-high-power-warm-w-leds
#20
Jiasong Zhong, Wei Xu, Qingli Chen, Shuo Yuan, Zhengguo Ji, Daqin Chen
Currently, the shortage of red components and easy aging of organic silicone still remain challenges for high-power phosphor-converted warm white light-emitting diodes (w-LEDs). Aiming to alleviate these issues, phosphor-in-glass (PiG), fabricated by co-sintering red- and yellow-emitting phosphors and low-melting glass, has been regarded as a promising color converter for w-LEDs. In this study, a Li(+),Mn(4+) co-doped SrMgAl10O17 red phosphor was synthesized via a conventional solid-state reaction. The as-prepared phosphor exhibits a deep red emission, ascribed to Mn(4+):(2)Eg → (4)A2g spin-forbidden transition in the range of 600-700 nm with a narrow-band full width at half maximum of 55 nm, and provides an ideal broadband excitation extending from 250 to 530 nm...
July 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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