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https://www.readbyqxmd.com/read/28635629/light-emitting-marker-for-robust-vision-based-on-the-spot-bacterial-growth-detection
#1
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/28633698/feasibility-of-a-streamlined-tuberculosis-diagnosis-and-treatment-initiation-strategy
#2
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/28632989/impact-of-interface-mixing-on-the-performance-of-solution-processed-organic-light-emitting-diodes-impedance-and-ultraviolet-photoelectron-spectroscopy-study
#3
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/28632325/nickelocene-precursor-facilitated-fast-growth-of-graphene-h-bn-vertical-heterostructures-and-its-applications-in-oleds
#4
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
#5
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
#6
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
#7
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/28629848/a-novel-intrinsic-electroretinogram-response-in-isolated-mouse-retina
#8
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
#9
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
#10
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/28626456/bactericidal-effect-of-photodynamic-therapy-alone-or-in-combination-with-mupirocin-or-linezolid-on-staphylococcus-aureus
#11
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
https://www.readbyqxmd.com/read/28621945/concentration-driven-selectivity-of-energy-transfer-channels-and-color-tunability-in-ba3la-po4-3-tb-3-sm-3-for-warm-white-leds
#12
Weijie Zhou, Meng Gu, Yiyi Ou, Caihua Zhang, Xuejie Zhang, Lei Zhou, Hongbin Liang
Here, we report the large-scale emission color tunability in Ba3La(PO4)3:Tb(3+), Sm(3+) (BLPO:TS) system based on the detailed discussion on the concentration-driven selectivity of energy transfer (ET) channels from Tb(3+) to Sm(3+). It is induced by the concentration-dependent (5)D3 and (5)D4 emissions of Tb(3+) and the different interaction mechanisms of ET from Tb(3+) to Sm(3+) via (5)D3 and (5)D4 channels. In the diluted Tb(3+) scenario, the red emission of Sm(3+) is efficiently sensitized via the (5)D3 channel, while in the concentrated Tb(3+) case, the contribution of (5)D4 channel is dominant...
June 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28621585/inactivation-of-nonpathogenic-escherichia-coli-escherichia-coli-o157-h7-salmonella-enterica-typhimurium-and-listeria-monocytogenes-in-ice-using-a-uvc-light-emitting-diode
#13
Suguru Murashita, Shuso Kawamura, Shigenobu Koseki
Ice, widely used in the food industry, is a potential cause of food poisoning resulting from microbial contamination. Direct microbial inactivation of ice is necessary because microorganisms may have been present in the source water used to make it and/or may have been introduced due to poor hygiene during production or handling of the ice. Nonthermal and nondestructive microbial inactivation technologies are needed to control microorganisms in ice. We evaluated the applicability of a UVC light-emitting diode (UVC-LED) for microbial inactivation in ice...
June 16, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28621565/light-emitting-diode-at-460%C3%A2-%C3%A2-%C3%A2-20%C3%A2-nm-increases-the-production-of-il-12-and-il-6-in-murine-dendritic-cells
#14
Tamires Marielem Carvalho-Costa, Maria Tays Mendes, Marcos Vinicius da Silva, Virmondes Rodrigues, Giuliana Cristina Marre Bruschi Thedei, Carlo Jose Freire Oliveira, Geraldo Thedei
BACKGROUND DATA: Light emitting diode (LED) therapy has been proposed as an option for the treatment of many skin inflammatory processes. Dendritic cells (DCs) are important cells of skin that participate in the initiation and activation of skin immunity. The modulation of these cells by LED could explain much of its effects. OBJECTIVE: Thus, the aim of this study was to examine the effects of LED at 460 ± 20 nm on cytokine production and the expression of surface markers on DCs...
June 15, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28618783/pulsed-light-emitting-diodes-for-higher-phytochemical-level-in-microgreens
#15
Viktorija Vaštakaitė, Akvilė Viršilė, Aušra Brazaitytė, Giedrė Samuolienė, Julė Jankauskienė, Algirdas Novičkovas, Pavelas Duchovskis
A novel research of pulsed LED lighting versus continuous lighting was conducted by analyzing phytochemicals levels in microgreens. Red pak choi (Brassica rapa var. chinensis), mustard (Brassica juncea L.) and tatsoi (Brassica rapa var. rosularis) were grown indoors under HPS lamps supplemented with monochromatic (455 nm, 470 nm, 505 nm, 590 nm and 627 nm) LEDs (total PPFD 200±10 µmol m(-2) s(-1); 16 h day(-1)). For pulsed light treatments, the frequencies at 2 Hz, 32 Hz, 256 Hz, and 1024 Hz with a duty cycle of 50% of monochromatic LEDs were applied...
June 15, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28618371/photodegradation-of-4-chlorophenoxyacetic-acid-under-visible-led-activated-n-doped-tio2-and-the-mechanism-of-stepwise-rate-increment-of-the-reused-catalyst
#16
Amal Abdelhaleem, Wei Chu
Photodegradation of 4-chlorophenoxyacetic acid (4-CPA) was systematically investigated using N-doped TiO2 (N-TiO2) under commercially available visible light emitting diode (Vis LED) as a novel Vis LED illumination in photocatalysis applications. The synergetic effect of Vis LED/N-TiO2 process was studied in detail by varying reaction conditions including the initial concentration of 4-CPA, catalyst dosage, light intensity, and initial pH. Additionally, the influence of inorganic anions and radical scavengers on the performance of the Vis LED/N-TiO2 process was also evaluated...
May 31, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28617315/study-of-a-compression-molding-process-for-ultraviolet-light-emitting-diode-exposure-systems-via-finite-element-analysis
#17
Kuo-Tsai Wu, Sheng-Jye Hwang, Huei-Huang Lee
Although wafer-level camera lenses are a very promising technology, problems such as warpage with time and non-uniform thickness of products still exist. In this study, finite element simulation was performed to simulate the compression molding process for acquiring the pressure distribution on the product on completion of the process and predicting the deformation with respect to the pressure distribution. Results show that the single-gate compression molding process significantly increases the pressure at the center of the product, whereas the multi-gate compressing molding process can effectively distribute the pressure...
June 15, 2017: Sensors
https://www.readbyqxmd.com/read/28613807/er3-fe3-stimulated-electroactive-visible-light-emitting-and-high-dielectric-flexible-pvdf-films-based-piezoelectric-nanogenerators-a-simple-and-superior-self-powered-energy-harvester-with-remarkable-power-density
#18
Nur Amin Hoque, Pradip Thakur, Swagata Roy, Arpan Kool, Biswajoy Bagchi, Prosenjit Biswas, Md Minarul Saikh, Farha Khatun, Sukhen Das, Partha Pratim Ray
Design of energy harvesting unit with superior output characteristics i.e. high power density is of great technological challenge in the present time. Here, a simple, light weight, flexible and cost effective piezoelectric nanogenerators (PENGs) have been fabricated integrating the aluminum electrodes on to Er3+/ Fe3+ stimulated electroactive, visible light emitting and large dielectric PVDF films where ErCl3. 6H2O and Fe(NO3)3 · 9H2O act as the catalytic agents for electroactive β polymorph nucleation and enhancement of dielectric properties...
June 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28613074/blue-to-green-emitting-neutral-ir-iii-complexes-bearing-pentafluorosulfanyl-groups-a-combined-experimental-and-theoretical-study
#19
Amlan K Pal, Adam F Henwood, David B Cordes, Alexandra M Z Slawin, Ifor D W Samuel, Eli Zysman-Colman
A structure-property relationship study of neutral heteroleptic (1 and 2, [Ir(C(∧)N)2(L(∧)X)]) and homoleptic (3 and 4, fac-[Ir(C(∧)N)3]) Ir(III) complexes (where L(∧)X = anionic 2,2,6,6-tetramethylheptane-3,5-dionato-κO(3),κO(6) (thd) and C(∧)N = a cyclometalating ligand bearing a pentafluorosulfanyl (-SF5) electron-withdrawing group (EWG) at the C4 (HL1) and C3 (HL2) positions of the phenyl moiety) is presented. These complexes have been fully structurally characterized, including by single-crystal X-ray diffraction, and their electrochemical and optical properties have also been extensively studied...
June 14, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28612929/flexible-organic-inorganic-hybrid-near-infrared-photoplethysmogram-sensor-for-cardiovascular-monitoring
#20
Huihua Xu, Jing Liu, Jie Zhang, Guodong Zhou, Ningqi Luo, Ni Zhao
Wearable photoplethysmogram (PPG) sensors offer convenient and informative measurements for evaluating daily physiological states of individuals. In this work, epidermal and flexible near-infrared (NIR) PPG sensors integrating a low-power, high-sensitivity organic phototransistor (OPT) with a high-efficiency inorganic light-emitting diode are developed. By exploiting an organic bulk heterojunction active layer and a bilayer gate dielectric design, a low voltage (<3 V) operated OPT with NIR responsivity as high as 3...
June 14, 2017: Advanced Materials
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