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https://www.readbyqxmd.com/read/27913440/optical-coherence-tomographic-angiography-of-choroidal-neovascularization-ill-defined-with-fluorescein-angiography
#1
Mehrdad Malihi, Yali Jia, Simon S Gao, Christina Flaxel, Andreas K Lauer, Thomas Hwang, David J Wilson, David Huang, Steven T Bailey
PURPOSE: To evaluate the morphological structure of ill-defined choroidal neovascularisation (CNV) with traditional fluorescein angiography (FA) compared with optical coherence tomographic angiography (OCTA). METHODS: A retrospective case series study of 11 eyes with ill-defined CNV on FA was performed. Eyes were scanned with commercially available spectral-domain optical coherence tomography (OCT) (70 000 A-scans/s). The split-spectrum amplitude-decorrelation angiography (SSADA) algorithm was used to distinguish blood flow from static tissue...
December 2, 2016: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/27912124/highly-dispersed-ultrasmall-ni-oh-2-aggregated-particles-on-a-conductive-support-as-a-supercapacitor-electrode-with-superior-performance
#2
Yue Wang, Xianfeng Zhang, Xin Li, Xiaojun Li, Yong Zhao, Hang Wei, Yongguang Liu, Peng Jiang, Minghui Liang
To reduce the size of Ni(OH)2 aggregates is an effective way to improve their capacitive performance for the electrodes of supercapacitors. The ultrasmall Ni(OH)2 aggregates (1-2nm) on active carbon (AC) can be obtained by depositing the soluble precursor of Ni(OH)2 on AC at low temperature. The Ni(OH)2/AC samples were characterized by SEM, TEM, XRD and XPS. The specific capacitance of ultrasmall Ni(OH)2 aggregates in the Ni(OH)2/AC composite can reach 2949Fg(-1) at a scan rate of 20mVs(-1), which is higher than its theoretical specific capacitance (2382Fg(-1))...
November 21, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27911421/-analysis-of-changes-in-central-macular-thickness-based-on-optical-coherence-tomography-angiography-findings-in-retinal-vein-occlusion
#3
M V Budzinskaya, A V Shelankova, M A Mikhailova, A A Plyukhova, N M Nurieva, A V Fomin
AIM: To investigate the relationship between OCT angiography measurements and central fundus changes in patients with retinal vein occlusion (RVO). MATERIAL AND METHODS: The study enrolled 21 RVO patients aged from 55 to 86 years (69.9±2.28 years), including 8 patients with ischemic central RVO (I-CRVO; 73.6±3.4 years on average) and 13 patients with branch RVO (BRVO; 67.6±3.0 years on average). Of the latter, 8 cases were ischemic (I-BRVO) and 5 non-ischemic (NI-BRVO)...
2016: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/27910696/a-new-setup-for-localized-implantation-and-live-characterization-of-kev-energy-multiply-charged-ions-at-the-nanoscale
#4
S Guillous, C Bourin, B Ban D'Etat, A Benyagoub, A Cassimi, C Feierstein, E Gardés, E Giglio, S Girard, C Grygiel, A Houel, H Lebius, A Méry, I Monnet, J-M Ramillon, J Rangama, F Ropars, E Verzeroli, M Viteau, A Delobbe
An innovative experimental setup, PELIICAEN, allowing the modification of materials and the study of the effects induced by multiply charged ion beams at the nanoscale is presented. This ultra-high vacuum (below 5 × 10(-10) mbar) apparatus is equipped with a focused ion beam column using multiply charged ions and a scanning electron microscope developed by Orsay Physics, as well as a scanning probe microscope. The dual beam approach coupled to the scanning probe microscope achieves nanometer scale in situ topological analysis of the surface modifications induced by the ion beams...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910624/a-scanning-hall-probe-microscope-for-high-resolution-large-area-variable-height-magnetic-field-imaging
#5
Gorky Shaw, R B G Kramer, N M Dempsey, K Hasselbach
We present a scanning Hall probe microscope operating in ambient conditions. One of the unique features of this microscope is the use of the same stepper motors for both sample positioning as well as scanning, which makes it possible to have a large scan range (few mm) in the x and y directions, with a scan resolution of 0.1 μm. Protocols have been implemented to enable scanning at different heights from the sample surface. The z range is 35 mm. Microstructured Hall probes of size 1-5 μm have been developed...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910601/combined-scanning-probe-microscopy-and-x-ray-scattering-instrument-for-in-situ-catalysis-investigations
#6
Willem G Onderwaater, Peter C van der Tuijn, Rik V Mom, Matthijs A van Spronsen, Sander B Roobol, Amirmehdi Saedi, Jakub Drnec, Helena Isern, Francesco Carla, Thomas Dufrane, Raymond Koehler, Bert Crama, Irene M N Groot, Roberto Felici, Joost W M Frenken
We have developed a new instrument combining a scanning probe microscope (SPM) and an X-ray scattering platform for ambient-pressure catalysis studies. The two instruments are integrated with a flow reactor and an ultra-high vacuum system that can be mounted easily on the diffractometer at a synchrotron end station. This makes it possible to perform SPM and X-ray scattering experiments in the same instrument under identical conditions that are relevant for catalysis.
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910561/orientation-free-and-differentially-pumped-addition-of-a-low-flux-reactive-gas-beam-to-a-surface-analysis-system
#7
Colin Harthcock, Abdolreza Jahanbekam, Jeremy R Eskelsen, David Y Lee
We describe an example of a piecewise gas chamber that can be customized to incorporate a low flux of gas-phase radicals with an existing surface analysis chamber for in situ and stepwise gas-surface interaction experiments without any constraint in orientation. The piecewise nature of this gas chamber provides complete angular freedom and easy alignment and does not require any modification of the existing surface analysis chamber. In addition, the entire gas-surface system is readily differentially pumped with the surface chamber kept under ultra-high-vacuum during the gas-surface measurements...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27907042/role-of-platelet-parameters-on-neovascular-glaucoma-a-retrospective-case-control-study-in-china
#8
Shengjie Li, Wenjun Cao, Xinghuai Sun
PURPOSE: Retinal vein occlusion (RVO) and diabetic retinopathy (DR) are two major sight-threatening diseases which may lead to neovascular glaucoma (NVG). The aim of this study was to explore the association between platelet parameters and NVG. METHODS: A total of 185 subjects were enrolled for the study from January, 2012 to December, 2015 at the Eye-ENT Hospital of Fudan University. Patients include those with NVG secondary to RVO (RVO group, n = 38), patients with NVG secondary to DR (DR group, n = 47), diabetics mellitus without retinopathy (DM group, n = 52), and healthy individuals (control group, n = 48)...
2016: PloS One
https://www.readbyqxmd.com/read/27906390/flexible-all-solid-state-supercapacitors-based-on-polyaniline-orderly-nanotubes-array
#9
Huihua Li, Juan Song, Linlin Wang, Xiaomiao Feng, Ruiqing Liu, Wenjin Zeng, Zhendong Huang, Yanwen Ma, Lianhui Wang
Flexible all-solid-state supercapacitors are crucial to meet the growing needs for portable electronic devices such as foldable phones and wearable electronics. As promising candidates for pseudocapacitor electrode materials, polyaniline (PANI) orderly nanotube arrays are prepared via a simple template electrodeposition method. The structures of the final product were characterized using various characterization techniques, including scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS)...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27906309/spiral-phase-mask-shadow-imaging-for-3d-measurement-of-flow-fields
#10
Martin Teich, Michael Mattern, Jeremy Sturm, Lars Büttner, Jürgen W Czarske
Particle tracking velocimetry (PTV) is a valuable tool for microfluidic analysis. Especially mixing processes and the environmental interaction of fluids on a microscopic scale are of particular importance for pharmaceutical and biomedical applications. However, currently applied techniques suffer from the lag of instantaneous depth information. Here we present a scan-free, shadow-imaging PTV-technique for 3D trajectory and velocity measurement of flow fields in micro-channels with 2 µm spatial resolution...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27905096/the-nanostructuring-of-atomically-flat-ru-0001-upon-oxidation-and-reduction
#11
A Goriachko, H Over
The O/Ru(0001) system is widely studied due to its rich phase variety of various stoichiometry and atomic arrangements, including the formation of a RuO2/Ru(0001) oxide layer. Apart from homogeneous ruthenium surfaces in certain oxidation states, also strongly heterogeneous surfaces can exist due to oxidation state's variation at the nanoscale. We report on a scanning tunneling microscopy (STM) study of the nanostructuring of the oxidized Ru(0001) surface as a result of its interaction with molecular oxygen at elevated temperatures and subsequent reduction of a resulting RuO2 film by CO or HCl molecules from the gas phase in high-vacuum environment...
December 2016: Nanoscale Research Letters
https://www.readbyqxmd.com/read/27904270/morphologic-changes-of-zebrafish-melanophore-after-intense-pulsed-light-and-q-switched-nd-yag-laser-irradiation
#12
Hwa Jung Ryu, Ji Min Lee, Hee Won Jang, Hae Chul Park, Im Joo Rhyu, Il-Hwan Kim
BACKGROUND: Recently, the pulse-in-pulse mode of intense pulsed light (IPL) has been used increasingly for the treatment of melasma. OBJECTIVE: To observe the morphologic changes in the melanophore in adult zebrafish after irradiation with conventional and pulse-in-pulse IPL and Q-switched Nd:YAG (QSNY) laser. METHODS: Adult zebrafish were irradiated with conventional and pulse-in-pulse mode of IPL. The conditions for conventional IPL were 3 mJ/cm(2), 560 nm filter, and pulse widths of 7, 20, and 35 msec...
December 2016: Annals of Dermatology
https://www.readbyqxmd.com/read/27903122/management-and-outcome-of-recurrent-adult-craniopharyngiomas-an-analysis-of-42-cases-with-long-term-follow-up
#13
Mazda K Turel, Georgios Tsermoulas, Lior Gonen, George Klironomos, Joao Paulo Almeida, Gelareh Zadeh, Fred Gentili
OBJECTIVE The treatment of recurrent and residual craniopharyngiomas is challenging. In this study the authors describe their experience with these tumors and make recommendations on their management. METHODS The authors performed an observational study of adult patients (≥ 18 years) with recurrent or residual craniopharyngiomas that were managed at their tertiary center. Retrospective data were collected on demographics and clinical, imaging, and treatment characteristics from patients who had a minimum 2-year follow-up...
December 2016: Neurosurgical Focus
https://www.readbyqxmd.com/read/27898997/the-effect-of-silica-and-prepolymer-nanoparticles-on-the-mechanical-properties-of-denture-base-acrylic-resin
#14
Pinar Cevik, Arzu Zeynep Yildirim-Bicer
PURPOSE: To evaluate how hydrophobic nanoparticle silica and prepolymer affect the flexural strength, surface hardness, surface roughness, and resilience of a denture base acrylic resin. MATERIALS AND METHODS: A total of 40 denture base acrylic resin specimens with dimensions 65 × 10 × 3 mm(3) were fabricated in this study. Specimens were divided into five experimental groups (n = 8) according to surface-treated silica and prepolymer concentration incorporated into the acrylic resin (weight %) prior to polymerization: G1 acted as control, no fillers were used in this group...
November 29, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/27898517/comparision-of-optical-low-coherence-reflectometry-versus-ultrasonic-biometry-in-high-hypermetropia
#15
Rukiye Aydin, Sevil Karaman Erdur, Kubra Serefoglu Cabuk, Eyyup Karahan, Suleyman Kaynak
PURPOSE: To compare anterior chamber depth (ACD), axial length (AL), and lens thickness (LT) measurements obtained by the Lenstar LS 900 (Haag-Streit AG) optical low-coherence reflectometry with those obtained by the A-scan contact ultrasound among patients with moderate and high hypermetropia. METHODS: Fifty-two eyes of 52 patients with moderate and high hypermetropia (spherical equivalent of +4 D or more) were examined in this study measurements of ACD, AL, and LT obtained by Lenstar were compared with those obtained by applanation A-scan ultrasound...
November 24, 2016: Eye & Contact Lens
https://www.readbyqxmd.com/read/27898333/chemical-synthesis-and-supercapacitive-properties-of-lanthanum-telluride-thin-film
#16
S J Patil, A C Lokhande, D-W Lee, J H Kim, C D Lokhande
Lanthanum telluride (La2Te3) thin films are synthesized via a successive ionic layer adsorption and reaction (SILAR) method. The crystal structure, surface morphology and surface wettability properties are investigated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Field emission scanning electron microscopy (FE-SEM) and contact angle goniometer techniques, respectively. The La2Te3 material exhibits a specific surface area of 51m(2)g(-1) determined by Brunauer-Emmett-Teller (BET) method...
November 9, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27896210/comparison-of-the-bonding-strengths-of-second-and-third-generation-light-emitting-diode-light-curing-units
#17
Hee-Min Lee, Sang-Cheol Kim, Kyung-Hwa Kang, Na-Young Chang
OBJECTIVE: With the introduction of third-generation light-emitting diodes (LEDs) in dental practice, it is necessary to compare their bracket-bonding effects, safety, and efficacy with those of the second-generation units. METHODS: In this study, 80 extracted human premolars were randomly divided into eight groups of 10 samples each. Metal or polycrystalline ceramic brackets were bonded on the teeth using second- or third-generation LED light-curing units (LCUs), according to the manufacturers' instructions...
November 2016: Korean Journal of Orthodontics
https://www.readbyqxmd.com/read/27895299/optimal-computed-tomographic-perfusion-scan-duration-for-assessment-of-acute-stroke-lesion-volumes
#18
Aimen S Kasasbeh, Søren Christensen, Matus Straka, Nishant Mishra, Michael Mlynash, Roland Bammer, Gregory W Albers, Maarten G Lansberg
BACKGROUND AND PURPOSE: The minimal scan duration needed to obtain reliable lesion volumes with computed tomographic perfusion (CTP) has not been well established in the literature. METHODS: We retrospectively assessed the impact of gradual truncation of the scan duration on acute ischemic lesion volume measurements. For each scan, we identified its optimal scan time, defined as the shortest scan duration that yields measurements of the ischemic lesion volumes similar to those obtained with longer scanning, and the relative height of the fitted venous output function at its optimal scan time...
December 2016: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/27888543/segmented-simultaneous-multi-slice-diffusion-weighted-imaging-with-generalized-trajectories
#19
Michael Herbst, Weiran Deng, Thomas Ernst, V Andrew Stenger
PURPOSE: The purpose of this work is to develop and evaluate a single framework for the use of Cartesian and non-Cartesian segmented trajectories for rapid and robust simultaneous multislice (SMS) diffusion weighted imaging (DWI) at 3 Telsa (T). METHODS: A generalized SMS approach with intrinsic phase navigation using Multiplexed Sensitivity Encoding (MUSE) was developed. Segmented blipped-controlled aliasing in parallel imaging echo planar imaging (EPI) and z-gradient modulated spiral trajectories were examined using SMS DWI scans at 3T with a 32-channel head coil...
November 25, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27886620/pet-measurement-of-gaba-shift-in-the-rat-brain-a-preclinical-application-of-bolus-plus-constant-infusion-paradigm-of-18-f-flumazenil
#20
Wook Kim, Hyun Soo Park, Byung Seok Moon, Byung Chul Lee, Sang Eun Kim
INTRODUCTION: We measured the tiagabine-induced enhancement of the GABAA receptor's affinity for benzodiazepine ligands ("GABA shift") using [(18)F]flumazenil (FMZ) PET with preclinical application of bolus plus constant infusion (B/I). Differences in quantified results of [(18)F]FMZ binding were compared to that of [(18)F]FMZ PET with single bolus injection (SB). MATERIALS AND METHODS: Sprague-Dawley rats underwent [(18)F]FMZ PET scans with B/I, which consisted of baseline and "GABA shift" sessions in a scan, or scans with SB one week apart...
November 4, 2016: Nuclear Medicine and Biology
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