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https://www.readbyqxmd.com/read/29240716/impedance-spectroscopy-analysis-and-equivalent-circuit-modeling-of-graphene-oxide-solutions
#1
Youngbin Yoon, Jeonghoo Jo, Seungdu Kim, In Gyu Lee, Byung Jin Cho, Myunghun Shin, Wan Sik Hwang
The optical and electrical characteristics of a graphene oxide solution (GS) with different graphene oxide (GO) concentrations in de-ionized water are investigated via the electrochemical impedance spectroscopy (EIS) method. The measurement results produced by the EIS for the GS are represented with both Bode and Nyquist plots in a frequency range from 1 kHz to 10 MHz. Using these results, we develop an equivalent circuit model as a function of the GO concentration, representing the GS as a mixed circuit of two-dimensional (2D) GO dispersed in parallel in de-ionized (DI) water...
December 14, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29240432/directing-nanoscale-optical-flows-by-coupling-photon-spin-to-plasmon-extrinsic-angular-momentum
#2
Yannick Lefier, Roland Salut, Miguel Angel Suarez, Thierry Grosjean
As any physical particle or object, light undergoing a circular trajectory features a constant extrinsic angular momentum. Within strong curvatures, this angular momentum can match the spin momentum of a photon, thus providing the opportunity of a strong spin-orbit interaction. Using this effect, we demonstrate tunable symmetry breaking in the coupling of light into a curved nanoscale plasmonic waveguide. The helicity of the impinging optical wave controls the power distribution between the two counter-propagating subwavelength guided modes, including unidirectional waveguiding...
December 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/29240082/study-on-the-mathematical-relationship-existing-between-single-photon-laser-doppler-flowmetry-and-diffuse-correlation-spectroscopy-with-static-background
#3
Tiziano Binzoni, Fabrizio Martelli
In the present contribution, the theoretical relationship existing between the blood flow index measured by diffuse correlation spectroscopy and single-photon laser-Doppler flowmetry (SP-LDF) is investigated. A specific mathematical description that accounts for the properties of single-photon detectors for SP-LDP was developed. Static background has also been considered and, to the best of our knowledge, this has never been included before in SP-LDF analytical theories. The comparisons were realized for two SP-LDF implementations: for "classical" and "fast" algorithms...
December 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29239886/acute-coronary-artery-dissection-a-review-of-the-literature-and-current-evidence
#4
Syed Raza Shah, Richard Alweis
Acute coronary artery dissection is a rare, complex disease occurring particularly in young women without traditional cardiovascular risk factors. The pathophysiology and treatment are different from acute coronary syndrome caused by plaque rupture or erosion. Its clinical presentation may vary from unstable angina to sudden cardiac death. Hence, early detection is crucial to manage the dissection and reduce the mortality and morbidity rates. Most coronary dissections will heal spontaneously, and conservative treatment is recommended for uncomplicated cases...
December 12, 2017: Cardiology in Review
https://www.readbyqxmd.com/read/29239229/in-vitro-evaluation-of-single-use-digital-flexible-ureteroscopes-a-practical-comparison-for-a-patient-centered-approach
#5
Giovanni Scala Marchini, Carlos Alfredo Batagello, Manoj Monga, Fabio Cesar Miranda Torricelli, Fabio Carvalho Vicentini, Alexandre Danilovic, Miguel Srougi, William Carlos Nahas, Eduardo Mazzucchi
OBJECTIVE: to compare the manufacturing and in vitro performance characteristics of two single use flexible ureteroscopes with a permanent optical flexible ureteroscope. MATERIAL AND METHODS: Two single-use flexible ureteroscopes, LithoVue (Boston Scientific, USA) and Pusen (1rs. generation; Zhuhai Pusen Medical Technology Company Limited, China) were tested and compared with a permanent Flex-X2 ureteroscope (Karl Storz, Germany) in terms of technical characteristics, optics, deflection mechanism and additional parameters which could potentially affect surgical technique...
December 14, 2017: Journal of Endourology
https://www.readbyqxmd.com/read/29237767/a-new-method-to-characterize-function-of-the-drosophila-heart-by-means-of-optical-flow
#6
Hauke Mönck, David Toppe, Eva Michael, Stephan Sigrist, Vincent Richter, Diana Hilpert, Davide Raccuglia, Marina Efetova, Martin Schwärzel
The minuteness of Drosophila poses a challenge to quantify performance of its tubular heart and computer-aided analysis of its beating heart has evolved as a resilient compromise between instrumental costs and data robustness. Here, we introduce an optical flow algorithm (OFA) that continuously registers coherent movement within videos of the beating Drosophila heart and uses this information to subscribe the time course of observation with characteristic phases of cardiac contraction or relaxation. We report that the OFA combines high discriminatory power with robustness to characterize the performance of the Drosophila tubular heart using indicators from human cardiology...
December 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29236784/preperimetric-glaucoma-prospective-observational-study-ppgps-design-baseline-characteristics-and-therapeutic-effect-of-tafluprost-in-preperimetric-glaucoma-eye
#7
Naoko Aizawa, Hiroshi Kunikata, Yukihiro Shiga, Satoru Tsuda, Yu Yokoyama, Kazuko Omodaka, Tomoki Yasui, Keiichi Kato, Hiroaki Kurashima, Etsuyo Miyamoto, Masayo Hashimoto, Toru Nakazawa
PURPOSE: There is no consensus on the diagnosis or treatment policy for Preperimetric Glaucoma (PPG) because the pathogenesis of PPG is not clear at this time. Preperimetric Glaucoma Prospective Observational Study (PPGPS) is a first multicenter, prospective, observational study to clarify the pathogenesis of PPG. This article indicates study design, patient baseline characteristics, and analysis focused on optic nerve head (ONH) blood flow in PPG, as well as the intraocular pressure (IOP) -lowering effect and ONH blood flow-improving effects of Tafluprost...
2017: PloS One
https://www.readbyqxmd.com/read/29232846/home-camera-based-fall-detection-system-for-the-elderly
#8
Koldo de Miguel, Alberto Brunete, Miguel Hernando, Ernesto Gambao
Falls are the leading cause of injury and death in elderly individuals. Unfortunately, fall detectors are typically based on wearable devices, and the elderly often forget to wear them. In addition, fall detectors based on artificial vision are not yet available on the market. In this paper, we present a new low-cost fall detector for smart homes based on artificial vision algorithms. Our detector combines several algorithms (background subtraction, Kalman filtering and optical flow) as input to a machine learning algorithm with high detection accuracy...
December 9, 2017: Sensors
https://www.readbyqxmd.com/read/29232826/iterative-refinement-of-transmission-map-for-stereo-image-defogging-using-a-dual-camera-sensor
#9
Heegwang Kim, Jinho Park, Hasil Park, Joonki Paik
Recently, the stereo imaging-based image enhancement approach has attracted increasing attention in the field of video analysis. This paper presents a dual camera-based stereo image defogging algorithm. Optical flow is first estimated from the stereo foggy image pair, and the initial disparity map is generated from the estimated optical flow. Next, an initial transmission map is generated using the initial disparity map. Atmospheric light is then estimated using the color line theory. The defogged result is finally reconstructed using the estimated transmission map and atmospheric light...
December 9, 2017: Sensors
https://www.readbyqxmd.com/read/29230463/real-time-two-photon-lithography-in-controlled-flow-to-create-a-single-microparticle-array-and-particle-cluster-array-for-optofluidic-imaging
#10
Bing Xu, Yang Shi, Zhaoxin Lao, Jincheng Ni, Guoqiang Li, Yanlei Hu, Jiawen Li, Jiaru Chu, Dong Wu, Koji Sugioka
Microarray technology provides an excellent platform for biomedical and biochemical research including basic scientific studies, drug discovery, and diagnostics. Here, we develop a novel method referred to as real-time two-photon lithography in a controlled flow in which femtosecond laser two-photon lithography is performed in situ in the sequential mode stopping and flowing the flow of liquid resin containing microparticles to achieve 100% trapping on a one-bead-to-one-trap basis. Polydisperse particles can be all trapped to form a desired array by freely designing trap structures, resulting in an unprecedentedly high capture efficiency of ∼100%...
December 12, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/29230438/a-programmable-optical-stimulator-for-the-drosophila-eye
#11
Xinping Chen, Walter D Leon-Salas, Taylor Zigon, Donald F Ready, Vikki M Weake
A programmable optical stimulator for Drosophila eyes is presented. The target application of the stimulator is to induce retinal degeneration in fly photoreceptor cells by exposing them to light in a controlled manner. The goal of this work is to obtain a reproducible system for studying age-related changes in susceptibility to environmental ocular stress. The stimulator uses light emitting diodes and an embedded computer to control illuminance, color (blue or red) and duration in two independent chambers...
October 2017: HardwareX
https://www.readbyqxmd.com/read/29230338/optical-coherence-tomography-angiography-of-punctate-inner-choroidopathy
#12
Blake M Hampton, Christopher M Aderman, Harry W Flynn, Jayanth Sridhar
Purpose: To report a case of bilateral choroidal neovascularization (CNV) in punctate inner choroidopathy (PIC) visualized utilizing optical coherence tomography angiography (OCT-A). Methods: Case report. Results: A 29-year-old woman presented with new visual symptoms in both eyes. Fundoscopic exam revealed bilateral multifocal, small, well-defined lesions consistent with PIC. Optical coherence tomography demonstrated subretinal fluid and retinal pigment epithelium detachments (RPEDs) in both eyes...
2017: Case Reports in Ophthalmological Medicine
https://www.readbyqxmd.com/read/29229707/the-primary-role-of-flow-processing-in-the-identification-of-scene-relative-object-movement
#13
Simon K Rushton, Diederick C Niehorster, Paul A Warren, Li Li
Retinal image motion could be due to movement of the observer through space or an object relative to the scene. Optic flow, form, and change of position cues all provide information that could be used to separate out retinal motion due to object movement from retinal motion due to observer movement. In Experiment 1 we used a minimal display to examine the contribution of optic flow and form cues. Human participants indicated the direction of movement of a probe object presented against a background of radially moving pairs of dots...
December 11, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29229445/optical-coherence-tomography-angiography
#14
REVIEW
Richard F Spaide, James G Fujimoto, Nadia K Waheed, Srinivas R Sadda, Giovanni Staurenghi
Optical coherence tomography (OCT) was one of the biggest advances in ophthalmic imaging. Building on that platform, OCT angiography (OCTA) provides depth resolved images of blood flow in the retina and choroid with levels of detailed far exceeding that obtained with older forms of imaging. This new modality is challenging because of the need for new equipment and processing techniques, current limitations of imaging capability, and rapid advancements in both imaging and in our understanding of the imaging and applicable pathophysiology of the retina and choroid, and the requirement for understanding the origins of image artifacts...
December 8, 2017: Progress in Retinal and Eye Research
https://www.readbyqxmd.com/read/29227980/spectral-domain-optical-coherence-tomography-angiography-for-the-diagnosis-and-evaluation-of-polypoidal-choroidal-vasculopathy
#15
Talisa E de Carlo, Gregg T Kokame, Jessica G Shantha, James C Lai, Raymond Wee
PURPOSE: To compare the diagnostic ability of optical coherence tomography angiography (OCTA) with indocyanine green angiography (ICGA) in polypoidal choroidal vasculopathy (PCV). METHODS: Retrospective review of 47 eyes with PCV imaged with ICGA and OCTA. For each eye, it was determined which imaging modality better delineated the PCV complex. The presence of a branching vascular network (BVN) and polyp(s) were noted. RESULTS: PCV was better visualized with ICGA in 21 eyes (44...
December 11, 2017: Ophthalmologica. Journal International D'ophtalmologie
https://www.readbyqxmd.com/read/29226684/quantum-dot-based-luminescent-nanoprobes-for-sigma-2-receptor-imaging
#16
Maria Laura Pati, Elisabetta Fanizza, Sonja Hager, Diana Groza, Petra Heffeter, Amelita Grazia Laurenza, Valentino Laquintana, Maria Lucia Curri, Nicoletta Depalo, Carmen Abate, Nunzio Denora
The increasing importance of sigma-2 receptor as target for the diagnosis and therapy of tumours paves the way for the development of innovative optically traceable fluorescent probes as tumour cell contrast and therapeutic agents. Here, a novel hybrid organic-inorganic nanostructure is developed by combining the superior fluorescent properties of inorganic quantum dots (QDs), coated with a hydrophilic silica shell (QD@SiO2 NPs), the versatility of the silica shell and the high selectivity for sigma-2 receptors of the two synthetic ligands, namely the 6-[(6-aminohexyl)oxy]-2-(3-(6,7-dimethoxy-3,4-dihydroisoquinolin-2(1H)-yl)propyl)-3,4-dihydroisoquinolin-1(2H)-one (MLP66) and 6-[1-[3-(4-cyclohexylpiperazin-1-yl)propyl]-1,2,3,4-tetrahydronaphthalen-5-yloxy]hexylamine (TA6)...
December 11, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29225494/rolling-resistance-of-shallow-granular-deformation
#17
Keaton J Burns, Neil J Balmforth, Ian J Hewitt
Experiments are conducted to measure the resistance experienced by light cylinders rolling over flat beds of granular media. Sand and glass spheres are used for the beds. The trajectories of the rolling cylinders are determined through optical tracking, and velocity and acceleration data are inferred through fits to these trajectories. The rolling resistance is dominated by a velocity-independent component, but a velocity-dependent drag exceeding the expected strength of air drag is also observed. The results are compared to a theoretical model based on a cohesionless Mohr-Coulomb rheology for a granular medium in the presence of gravity...
November 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/29225421/flow-through-microfluidic-immunosensors-with-refractive-index-matched-silica-monoliths-as-volumetric-optical-detection-elements
#18
M S Wiederoder, E L Kendall, J-H Han, R G Ulrich, D L DeVoe
A sensitive and rapid absorbance based immunosensor that utilizes ex situ functionalized porous silica monoliths as volumetric optical detection elements is demonstrated in this study. The porous monolith structure facilitates high capture probe density and short diffusion length scales, enabling sensitive and rapid assays. Silica monoliths, synthesized and functionalized with immunocapture probes off-chip before integration into a sealed thermoplastic microfluidic device, serve to capture target antigens during perfusion through the porous structure...
January 2018: Sensors and Actuators. B, Chemical
https://www.readbyqxmd.com/read/29223084/wetlands-receiving-water-treated-with-coagulants-improve-water-quality-by-removing-dissolved-organic-carbon-and-disinfection-byproduct-precursors
#19
Angela M Hansen, Tamara E C Kraus, Sandra M Bachand, William R Horwath, Philip A M Bachand
Constructed wetlands are used worldwide to improve water quality while also providing critical wetland habitat. However, wetlands have the potential to negatively impact drinking water quality by exporting dissolved organic carbon (DOC) that upon disinfection can form disinfection byproducts (DBPs) like trihalomethanes (THMs) and haloacetic acids (HAAs). We used a replicated field-scale study located on organic rich soils in California's Sacramento-San Joaquin Delta to test whether constructed flow-through wetlands which receive water high in DOC that is treated with either iron- or aluminum-based coagulants can improve water quality with respect to DBP formation...
December 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29220370/absence-of-anti-hypocretin-receptor-2-autoantibodies-in-post-pandemrix-narcolepsy-cases
#20
Guo Luo, Ling Lin, Louis Jacob, Mélodie Bonvalet, Aditya Ambati, Giuseppe Plazzi, Fabio Pizza, Ryan Leib, Christopher M Adams, Markku Partinen, Emmanuel Jean-Marie Mignot
BACKGROUND: A recent publication suggested molecular mimicry of a nucleoprotein (NP) sequence from A/Puerto Rico/8/1934 (PR8) strain, the backbone used in the construction of the reassortant strain X-179A that was used in Pandemrix® vaccine, and reported on anti-hypocretin (HCRT) receptor 2 (anti-HCRTR2) autoantibodies in narcolepsy, mostly in post Pandemrix® narcolepsy cases (17 of 20 sera). In this study, we re-examined this hypothesis through mass spectrometry (MS) characterization of Pandemrix®, and two other pandemic H1N1 (pH1N1)-2009 vaccines, Arepanrix® and Focetria®, and analyzed anti-HCRTR2 autoantibodies in narcolepsy patients and controls using three independent strategies...
2017: PloS One
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