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https://www.readbyqxmd.com/read/28550346/differential-microvascular-assessment-of-retinal-vein-occlusion-with-coherence-tomography-angiography-and-fluorescein-angiography-a-blinded-comparative-study
#1
Chung Yee Chung, Heather Hoi Yau Tang, Siu Hung Li, Kenneth Kai Wang Li
PURPOSE: To compare the imaging of retinal vein occlusion (RVO) with optical coherence tomography angiography (OCTA) and fluorescein angiography (FA) and evaluate their roles in clinical management. METHODS: RVO patients who underwent imaging with both FA and OCTA from 1 June 2015-31 December 2015 were enrolled. An independent retinal specialist blinded from patient identity assessed the FA and OCTA reports. The pixel counting technique was used for FAZ size measurement...
May 26, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28549848/relationship-between-visual-acuity-and-retinal-thickness-during-anti-vascular-endothelial-growth-factor-therapy-for-retinal-diseases
#2
William C Ou, David M Brown, John F Payne, Charles C Wykoff
PURPOSE: Investigate the relationship between best-corrected visual acuity (BCVA) and central retinal thickness (CRT) in eyes receiving ranibizumab for three common retinal diseases. DESIGN: Retrospective analysis of clinical trial data METHODS: Early Treatment Diabetic Retinopathy Study BCVA and spectral-domain optical coherence tomography measured CRT of 387 eyes of 345 patients enrolled in six prospective clinical trials for management of neovascular age-related macular degeneration (AMD), diabetic macular edema (DME), and retinal vein occlusion (RVO) were evaluated by Pearson correlation and linear regression...
May 23, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28549518/ganglion-cell-inner-plexiform-layer-change-detected-by-optical-coherence-tomography-indicates-progression-in-advanced-glaucoma
#3
Joong Won Shin, Kyung Rim Sung, Gary C Lee, Mary K Durbin, Daniel Cheng
PURPOSE: To examine the performance of Guided Progression Analysis (GPA; Carl Zeiss Meditec, Dublin, CA) in spectral-domain optical coherence tomography (OCT) in detecting progressive thinning of ganglion cell-inner plexiform layer (GCIPL) and retinal nerve fiber layer (RNFL) in glaucoma. DESIGN: Longitudinal, observational study. PARTICIPANTS: A total of 196 eyes of 123 primary open-angle glaucoma patients (mean follow-up, 5.0 years). METHODS: Macular GCIPL and peripapillary RNFL thicknesses were measured by Cirrus HD-OCT (Zeiss, Dublin, CA), and progressive GCIPL and RNFL thinning were assessed by GPA...
May 23, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28549478/gladiator-a-global-approach-for-elucidating-disease-modules
#4
Yael Silberberg, Martin Kupiec, Roded Sharan
BACKGROUND: Understanding the genetic basis of disease is an important challenge in biology and medicine. The observation that disease-related proteins often interact with one another has motivated numerous network-based approaches for deciphering disease mechanisms. In particular, protein-protein interaction networks were successfully used to illuminate disease modules, i.e., interacting proteins working in concert to drive a disease. The identification of these modules can further our understanding of disease mechanisms...
May 26, 2017: Genome Medicine
https://www.readbyqxmd.com/read/28549088/quantitative-association-between-peripapillary-bruch-s-membrane-shape-and-intracranial-pressure
#5
Amulya Gampa, Gautam Vangipuram, Zainab Shirazi, Heather E Moss
Purpose: The purpose of this study was to determine if there is a quantitative relationship between chronic intracranial pressure (ICP) and peripapillary Bruch's membrane (pp-BM) shape and to determine whether change in pp-BM shape can be detected within 1 hour after ICP lowering by lumbar puncture (LP). Methods: In this study, 30° nasal-temporal optical coherence tomography B-scans were obtained within 1 hour before and after LP in 39 eyes from 20 patients (age = 23-86 years, 75% female, ICP [opening pressure] = 10-55 cm H2O)...
May 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28549084/en-face-time-domain-optical-coherence-tomography-with-dynamic-focus-for-high-resolution-imaging
#6
Mohammad R N Avanaki, Adrian Podoleanu
No abstract text is available yet for this article.
May 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28548907/evaluation-of-thermal-optical-analysis-method-of-elemental-carbon-for-marine-fuel-exhaust
#7
Maija K Lappi, Jyrki P Ristimäki
The awareness of black carbon (BC) as the second largest anthropogenic contributor in global warming and an ice melting enhancer has increased. Due to prospected increase in shipping especially in the Arctic reliability of BC emissions and their invented amounts from ships is gaining more attention. The International Maritime Organisation (IMO) is actively working towards estimation of quantities and effects of BC especially in the Arctic. IMO has launched work towards constituting a definition for BC and agreeing appropriate methods for its determination from shipping emission sources...
May 26, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28548562/memory-for-melodies-in-unfamiliar-tuning-systems-investigating-effects-of-recency-and-number-of-intervening-items
#8
Steffen A Herff, Kirk N Olsen, Roger T Dean, Jon Prince
In a continuous recognition paradigm, most stimuli elicit superior recognition performance when the item to be recognised is the most recent stimulus (a recency-in-memory effect). Furthermore, increasing the number of intervening items cumulatively disrupts memory in most domains. Memory for melodies composed in familiar tuning systems also shows superior recognition for the most recent melody, but no disruptive effects from the number of intervening melodies. A possible explanation has been offered in a novel regenerative multiple representations (RMR) conjecture...
May 26, 2017: Quarterly Journal of Experimental Psychology: QJEP
https://www.readbyqxmd.com/read/28548522/zero-phase-difference-josephson-current-based-on-spontaneous-symmetry-breaking-via-parametric-excitation-of-a-movable-superconducting-dot
#9
A M Eriksson, A Vikström
Recent advances have attracted attention to nonstandard Josephson junctions in which a supercurrent can flow despite zero phase difference between the constituent superconducting leads. Here, we propose a zero-phase-difference nanoelectromechanical junction which, in contrast to other considered systems, exhibits symmetry between leftward and rightward tunneling through the junction. We show that a supercurrent is, nevertheless, possible as a result of spontaneous symmetry breaking. In the suggested junction, the supercurrent is mediated by tunneling via a superconducting Cooper-pair box on a mechanical resonator...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28548521/double-quantum-spin-relaxation-limits-to-coherence-of-near-surface-nitrogen-vacancy-centers
#10
B A Myers, A Ariyaratne, A C Bleszynski Jayich
We probe the relaxation dynamics of the full three-level spin system of near-surface nitrogen-vacancy (NV) centers in diamond to define a T_{1} relaxation time that sets the T_{2}≤2T_{1} coherence limit of the NV's subset qubit superpositions. We find that double-quantum spin relaxation via electric field noise dominates T_{1} of near-surface NVs at low applied magnetic fields. Furthermore, we differentiate 1/f^{α} spectra of electric and magnetic field noise using a novel noise-spectroscopy technique, with broad applications in probing surface-induced decoherence at material interfaces...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28548182/structural-and-electronic-properties-of-defects-at-grain-boundaries-in-cuinse2
#11
R Saniz, J Bekaert, B Partoens, D Lamoen
We report on a first-principles study of the structural and electronic properties of a Σ3 (112) grain boundary model in CuInSe2. The study focuses on a coherent, stoichiometry preserving, cation-Se terminated grain boundary, addressing the properties of the grain boundary as such, as well as the effect of well known defects in CuInSe2. We show that in spite of its apparent simplicity, such a grain boundary exhibits a very rich phenomenology, providing an explanation for several of the experimentally observed properties of grain boundaries in CuInSe2 thin films...
May 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28548088/direct-observation-of-coherent-energy-transfer-in-nonlinear-micromechanical-oscillators
#12
Changyao Chen, Damián H Zanette, David A Czaplewski, Steven Shaw, Daniel López
Energy dissipation is an unavoidable phenomenon of physical systems that are directly coupled to an external environmental bath. In an oscillatory system, it leads to the decay of the oscillation amplitude. In situations where stable oscillations are required, the energy dissipated by the vibrations is usually compensated by replenishment from external energy sources. Consequently, if the external energy supply is removed, the amplitude of oscillations start to decay immediately, since there is no means to restitute the energy dissipated...
May 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28548085/ultrafast-coherence-transfer-in-dna-templated-silver-nanoclusters
#13
Erling Thyrhaug, Sidsel Ammitzbøll Bogh, Miguel R Carro-Temboury, Charlotte Stahl Madsen, Tom Vosch, Donatas Zigmantas
DNA-templated silver nanoclusters of a few tens of atoms or less have come into prominence over the last several years due to very strong absorption and efficient emission. Applications in microscopy and sensing have already been realized, however little is known about the excited-state structure and dynamics in these clusters. Here we report on a multidimensional spectroscopy investigation of the energy-level structure and the early-time relaxation cascade, which eventually results in the population of an emitting state...
May 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28547533/sensitivity-and-specificity-of-optical-coherence-tomography-angiography-oct-a-for-detection-of-choroidal-neovascularization-in-real-life-practice-and-varying-retinal-expertise-level
#14
Vaël Souedan, Eric H Souied, Violaine Caillaux, Alexandra Miere, Ala El Ameen, Rocio Blanco-Garavito
PURPOSE: To evaluate the diagnostic accuracy of OCT angiography (OCT-A) detecting or predicting choroidal neovascularization (CNV), by ophthalmologists of disparate degrees of skills in retinal diseases, using spectral domain optical coherence tomography (SD-OCT) and fluorescein angiography (FA) as a standard reference. METHODS: Retrospective observational case series. Patient presenting maculopathy and complete imaging were included. FA, SD-OCT, OCT-A and FA coupled to SD-OCT images were graded independently for presence or absence of CNV by ophthalmologists with varying expertise levels...
May 25, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28547132/retinal-oxygen-extraction-in-individuals-with-type-1-diabetes-with-no-or-mild-diabetic-retinopathy
#15
Klemens Fondi, Piotr A Wozniak, Kinga Howorka, Ahmed M Bata, Gerold C Aschinger, Alina Popa-Cherecheanu, Katarzyna J Witkowska, Anton Hommer, Doreen Schmidl, René M Werkmeister, Gerhard Garhöfer, Leopold Schmetterer
AIMS/HYPOTHESIS: The aim of this study was to compare retinal oxygen extraction in individuals with diabetes with no or mild non-proliferative diabetic retinopathy and healthy age- and sex-matched volunteers. METHODS: A total of 24 participants with type 1 diabetes and 24 healthy age- and sex-matched volunteers were included in this cross-sectional study. Retinal oxygen extraction was measured by combining total retinal blood flow measurements using a custom-built bi-directional Doppler optical coherence tomography system with measurements of oxygen saturation using spectroscopic reflectometry...
May 25, 2017: Diabetologia
https://www.readbyqxmd.com/read/28546934/foveal-thickness-reduction-after-anti-vascular-endothelial-growth-factor-treatment-in-chronic-diabetic-macular-edema
#16
Gabriel Willmann, Antonio Brunno Nepomuceno, Katharina Messias, Leticia Barroso, Ingrid U Scott, André Messias, Rodrigo Jorge
AIM: To report foveal thickness reduction in eyes with resolution of macular edema and recovery of a foveal depression after one-year of anti-vascular endothelial growth factor (anti-VEGF) therapy for center-involving diabetic macular edema (DME). METHODS: Foveal thickness was assessed with optical coherence tomography to determine the central subfield foveal thickness (CSFT) and macular volume in 42 eyes with DME (CSFT>275 µm). Evaluations also included measurement of best-corrected visual acuity (BCVA), and were performed at baseline, and upon foveal depression recovery achieved after 12 monthly intravitreal injections of either 1...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28546926/iontophoresis-assisted-corneal-crosslinking-using-0-1-riboflavin-for-progressive-keratoconus
#17
Hong-Zhen Jia, Xu Pang, Zheng-Jun Fan, Na Li, Gang Li, Xiu-Jun Peng
AIM: To report the clinical results of iontophoresis-assisted epithelium-on corneal crosslinking (I-CXL) using 0.1% riboflavin in distilled water for progressive keratoconus. METHODS: In this prospective clinical study, we examined 94 eyes of 75 patients with progressive keratoconus who were treated with I-CXL using 0.1% riboflavin in distilled water. Best correct visual acuity (BCVA), Scheimpflug tomography, corneal topography, anterior segment optical coherence tomography, intraocular pressure, and endothelial cell density were evaluated at baseline and 1, 3, 6, 12, and 24mo after I-CXL...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28546889/tuning-the-spin-coherence-time-of-cu-ii-bis-oxamato-and-cu-ii-bis-oxamidato-complexes-by-advanced-esr-pulse-protocols
#18
Ruslan Zaripov, Evgeniya Vavilova, Iskander Khairuzhdinov, Kev Salikhov, Violeta Voronkova, Mohammad A Abdulmalic, Francois E Meva, Saddam Weheabby, Tobias Rüffer, Bernd Büchner, Vladislav Kataev
We have investigated with the pulsed ESR technique at X- and Q-band frequencies the coherence and relaxation of Cu spins S = 1/2 in single crystals of diamagnetically diluted mononuclear [n-Bu4N]2[Cu(opba)] (1%) in the host lattice of [n-Bu4N]2[Ni(opba)] (99%, opba = o-phenylenebis(oxamato)) and of diamagnetically diluted mononuclear [n-Bu4N]2[Cu(opbon-Pr2)] (1%) in the host lattice of [n-Bu4N]2[Ni(opbon-Pr2)] (99%, opbon-Pr2 = o-phenylenebis(N(propyl)oxamidato)). For that we have measured the electron spin dephasing time Tm at different temperatures with the two-pulse primary echo and with the special Carr-Purcell-Meiboom-Gill (CPMG) multiple microwave pulse sequence...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546695/retinal-vascular-occlusion-secondary-to-retrobulbar-injection-case-report-and-literature-review
#19
Dhaivat Vasavada, Prabu Baskaran, Seema Ramakrishnan
Retrobulbar injection has been widely practiced as a technique of ocular anesthesia for many decades. Nevertheless, the technique is not free from complications. Vascular occlusion secondary to retrobulbar injection is rare but can be vision threatening. We report a case series of two such patients who presented with poor vision following retrobulbar injection. Fundus showed pale retina with cherry red spot suggestive of central retinal artery occlusion in case 1 and pale disc with sclerosed vessels and multiple superficial hemorrhages suggestive of a combined occlusion of retinal artery and vein in case 2...
January 2017: Middle East African Journal of Ophthalmology
https://www.readbyqxmd.com/read/28546692/age-related-changes-in-the-foveal-bulge-in-healthy-eyes
#20
Kumar Saurabh, Rupak Roy, Preeti Sharma, Dhileesh P Chandrasekharan, Kaustubh Deshmukh, Chinmayi Vyas
BACKGROUND: Intact foveal bulge has been associated with good visual outcome in retinal diseases. The aim of this study was to study the variation in foveal bulge with age. METHODS: It was an observational cross-sectional study conducted between October 2014 and December 2015. Totally, 101 eyes of 101 healthy volunteers were studied in a tertiary care center. All individuals had best corrected visual acuity of 20/20 or better. High myopia (>6 D), high hyperopia (>4 D), unstable fixation, media opacities and retinal disorder like diabetic retinopathy, retinal vein occlusion were the exclusion criteria...
January 2017: Middle East African Journal of Ophthalmology
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