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https://www.readbyqxmd.com/read/28937857/evaluation-of-retinal-blood-flow-before-and-after-panretinal-photocoagulation-using-pattern-scan-laser-for-diabetic-retinopathy
#1
Yoshihisa Yamada, Kiyoshi Suzuma, Naoko Onizuka, Masafumi Uematsu, Yasser Helmy Mohamed, Takashi Kitaoka
PURPOSE: Laser speckle flowgraphy (LSFG) can measure blood flow in the ocular fundus. We analyzed the relationship between retinal blood flow and panretinal photocoagulation (PRP) in diabetic retinopathy. METHODS: This retrospective observational study examined the eyes of 35 patients with proliferative diabetic retinopathy (PDR) or non-PDR (NPDR). PRP was performed using a pattern scan laser. Using LSFG, blood flow was evaluated as the mean blur rate (MBR) or the relative flow volume (RFV)...
September 22, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28935978/-optical-and-surface-enhanced-raman-scattering-properties-of-ag-modified-silicon-double-nanocone-array
#2
L Mehrvar, M Sadeghipari, S H Tavassoli, S Mohajerzadeh, M Fathipour
Surface enhanced Raman scattering (SERS) systems with large number of active sites exhibit superior capability in detection of low concentration analytes. In this paper, we present theoretical as well as experimental studies on the optical properties of a unique hybrid nanostructure, Ag NPs decorated silicon double nanocones (Si-DNCs) array, which provide high density of hot spots. The Si-DNC array is fabricated by employing electron beam lithography together with plasma etching process. Multipole analysis of the scattering spectra, based on the multipole expansion theory, confirms that the toroidal dipole moment dominates over other electric and magnetic multipole moments in the Si-DNCs array...
September 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28935879/interlayer-excitons-in-a-bulk-van-der-waals-semiconductor
#3
Ashish Arora, Matthias Drüppel, Robert Schmidt, Thorsten Deilmann, Robert Schneider, Maciej R Molas, Philipp Marauhn, Steffen Michaelis de Vasconcellos, Marek Potemski, Michael Rohlfing, Rudolf Bratschitsch
Bound electron-hole pairs called excitons govern the electronic and optical response of many organic and inorganic semiconductors. Excitons with spatially displaced wave functions of electrons and holes (interlayer excitons) are important for Bose-Einstein condensation, superfluidity, dissipationless current flow, and the light-induced exciton spin Hall effect. Here we report on the discovery of interlayer excitons in a bulk van der Waals semiconductor. They form due to strong localization and spin-valley coupling of charge carriers...
September 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28932922/decreased-ocular-blood-flow-after-photocoagulation-therapy-in-neonatal-retinopathy-of-prematurity
#4
Tadashi Matsumoto, Takashi Itokawa, Tomoaki Shiba, Masahiko Tomita, Kotaro Hine, Norio Mizukaki, Hitoshi Yoda, Yuichi Hori
PURPOSE: To evaluate the relationships between optic nerve head blood flow, expressed as mean blur rate (MBR) measured by laser speckle flowgraphy (LSFG), and photocoagulation therapy in neonates with retinopathy of prematurity (ROP). STUDY DESIGN: Case series study. METHODS: We studied 5 ROP neonates either during sleep or under sedation both before and after photocoagulation, and evaluated 8 eyes in which the circulation could be measured three times consecutively...
September 20, 2017: Japanese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28931297/-intracranial-pressure-evaluation-by-ophthalmologist
#5
J Čmelo, R Illéš, J Šteňo
The value of ICT is important in diagnosis of the diseases of the eye and orbit Methods for direct measurement of intracranial pressure (ICT) are exact, but they are invasive and there is some risk of infection and damage of the tissue. Currently there are 2 valid indirect methods of mesurement of IKT. Digital Ophthalmodynamometry (D-ODM) and Transcranial Doppler ultrasonography (TDU). D-ODM is a non-invasive method for measuring of the Pulsating Venous Pressure (VPT). We can measure VPT by the pulse phenomena...
2017: Ceská a Slovenská Oftalmologie
https://www.readbyqxmd.com/read/28930633/controlled-orientation-of-droplets-in-ellipsoid-filled-polymeric-emulsions-by-particle-parameters-and-flow-conditions
#6
Chaoying Mao, Yajiang Huang, Junlong Yang, Miqiu Kong, Yuan Wang, Qi Yang, Guangxian Li
The effect of particle parameters (aspect ratio, AR, and concentration) and flow conditions (gap spacing and shear rate) on droplet orientation deformation behavior in polystyrene (PS) particle-filled binary polymeric emulsions is investigated by using rheo-optical technique and confocal microscopy. Interesting vorticity orientation behavior is achieved by tailoring experimental conditions to gain rigid anisotropic droplets during slow confined shear flow. PS ellipsoids with high AR are found to reside both at the fluid interface in a monolayer side-on state and inside droplets, leading to the formation of rigid anisotropic droplets due to interfacial/bulk jamming effect at appropriate particle concentrations...
September 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28928966/optical-coherence-tomography-angiography-in-glaucoma-a-mini-review
#7
REVIEW
Kelvin H Wan, Christopher K S Leung
The advent of optical coherence tomography angiography (OCT-A) provides a new opportunity to visualize the retinal vasculature in a non-invasive and dye-free manner which may help identify vascular abnormalities in glaucoma. While a reduction in retinal and optic nerve head vessel densities and blood flow indexes measured by OCT-A has been demonstrated in patients with glaucoma in many studies, it is unclear whether OCT-A provides additional information for the detection and monitoring of glaucoma compared with OCT measurements such as retinal nerve fiber layer thickness, neuroretinal rim width, and ganglion cell inner plexiform layer thickness...
2017: F1000Research
https://www.readbyqxmd.com/read/28927166/experimental-evaluation-of-respirable-dust-and-crystalline-silica-controls-during-simulated-performance-of-stone-countertop-fabrication-tasks-with-powered-hand-tools
#8
David L Johnson, Margaret L Phillips, Chaolong Qi, Anthony T Van, Danielle A Hawley
Objectives: Workers who fabricate stone countertops using hand tools are at risk of silicosis from overexposure to respirable crystalline silica. This study explored the efficacy of simple engineering controls that can be used for dust suppression during use of hand tools by stone countertop fabricators. Methods: Controlled experiments were conducted to measure whether wet methods and on-tool local exhaust ventilation (LEV) reduced respirable dust (RD) exposures during use of various powered hand tools on quartz-rich engineered stone...
July 1, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/28926354/neointimal-coverage-of-jailed-side-branches-in-coronary-bifurcation-lesions-an-optical-coherence-tomography-analysis
#9
Teruyoshi Kume, Ryotaro Yamada, Koyama Terumasa, Tomoko Tamada, Koichiro Imai, Kenzo Fukuhara, Yutaka Goryo, Ai Kawamura, Okamoto Hiroshi, Yoji Neishi, Shiro Uemura
OBJECTIVES: The jailed strut at the side-branch (SB) orifice may be a cause of delayed neointimal coverage and SB flow disturbance after single stenting to bifurcation. The aim of this study was to characterize the exact relationship between the jailed strut pattern at the SB orifice immediately after stent implantation and neointimal coverage of the jailed SB orifice in the chronic phase. PATIENTS AND METHODS: A total of 29 bifurcation (left anterior descending coronary artery and diagonal branch) lesions treated by optical coherence tomography-guide single-stent implantation and followed at 18 months after a percutaneous coronary intervention were included in this study...
September 18, 2017: Coronary Artery Disease
https://www.readbyqxmd.com/read/28925937/repetitive-immunosensor-with-a-fiber-optic-device-and-antibody-coated-magnetic-beads-for-semi-continuous-monitoring-of-escherichia-coli-o157-h7
#10
Midori Taniguchi, Hirokazu Saito, Kohji Mitsubayashi
A rapid and reproducible fiber-optic immunosensor for Escherichia coli O157:H7 (E. coli O157:H7) was described. The biosensor consisted of a flow cell, an optical fiber with a thin Ni layer, and a PC linked fluorometer. First, the samples with E. coli O157:H7 were incubated with magnetic beads coated with anti-E. coli O157:H7 antibodies and anti-E. coli O157:H7 antibodies labeled cyanine 5 (Cy5) to make sandwich complexes. Then the Cy5-(E. coli O157:H7)-beads were injected into a flow cell and pulled to the magnetized Ni layer on the optical fiber set in the flow cell...
September 19, 2017: Sensors
https://www.readbyqxmd.com/read/28922391/impedance-biosensor-for-real-time-monitoring-and-prediction-of-thrombotic-individual-profile-in-flowing-blood
#11
Denise De Zanet, Monica Battiston, Elisabetta Lombardi, Ruben Specogna, Francesco Trevisan, Luigi De Marco, Antonio Affanni, Mario Mazzucato
A new biosensor for the real-time analysis of thrombus formation is reported. The fast and accurate monitoring of the individual thrombotic risk represents a challenge in cardiovascular diagnostics and in treatment of hemostatic diseases. Thrombus volume, as representative index of the related thrombotic status, is usually estimated with confocal microscope at the end of each in vitro experiment, without providing a useful behavioral information of the biological sample such as platelets adhesion and aggregation in flowing blood...
2017: PloS One
https://www.readbyqxmd.com/read/28920900/fundamental-principles-on-learning-new-features-for-effective-dense-matching
#12
Feihu Zhang, Benjamin W Wah
In dense matching (including stereo matching and optical flow), nearly all existing approaches are based on simple features, such as gray or RGB color, gradient or simple transformations like census, to calculate matching costs. These features do not perform well in complex scenes that may involve radiometric changes, noises, overexposure and/or textureless regions. Various problems may appear, such as wrong matching at the pixel or region level, flattening/breaking of edges and/or even entire structural collapse...
September 14, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28920123/passivating-1t-mote2-multilayers-at-elevated-temperatures-by-encapsulation
#13
Dennis Wang, Kori Smyser, Daniel Rhodes, Luis Balicas, Abhay Pasupathy, Irving P Herman
Several-layer 1T'-MoTe2 decomposes very little during heating up to ∼550 °C under flowing argon when encapsulated by multilayer hBN, as monitored by Raman scattering and optical microscopy, but largely decomposes at much lower temperatures in incompletely covered and uncovered regions. In covered regions there are small amounts of tellurium product above ∼250 °C.
September 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28915256/optical-coherence-tomography-angiography-of-the-peripapillary-capillaries-in-primary-open-angle-and-normal-tension-glaucoma
#14
Ryoko Igarashi, Shun Ochiai, Yuta Sakaue, Aki Suetake, Ryu Iikawa, Testuya Togano, Fuuko Miyamoto, Daiki Miyamoto, Takeo Fukuchi
OBJECTIVES: To evaluate the vascular architecture of the radial peripapillary capillaries (RPCs) and its relation with visual function in patients with open-angle glaucoma (OAG) and normal-tension glaucoma using spectral-domain optical coherence tomography (SD-OCT) angiography. SUBJECTS AND METHODS: Clear OCT angiography images of blood vessels in the optic disc and peripapillary retina were obtained from 52 patients (52 eyes) aged 55.42±10.64 (range 28-72) years with primary OAG...
2017: PloS One
https://www.readbyqxmd.com/read/28914931/high-speed-2d-raman-imaging-at-elevated-pressures
#15
Naibo Jiang, Paul S Hsu, Jason G Mance, Yue Wu, Mark Gragston, Zhili Zhang, Joseph D Miller, James R Gord, Sukesh Roy
Two-dimensional (2D) Raman scattering at 10 kHz in non-reacting flow mixtures is demonstrated by employing a burst-mode laser with a long-duration pulse of about 70 ns and pulse energy of about 750 mJ at 532 nm. To avoid optical breakdown, the pulse width of the laser was varied in the range of 10-1000 ns. The effects of pulse shape, pulse energy, and harmonic conversion on 2D measurements are also studied. The applications of high-speed, single-shot, 2D imaging of CH4 and H2 jets in N2 at elevated pressures are demonstrated...
September 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28914896/rapid-measurement-of-transversal-flow-velocity-vector-with-high-spatial-resolution-using-speckle-decorrelation-optical-coherence-tomography
#16
Lei Fu, Ya Su, Yimin Wang, Lei Chen, Wenping Li, Hongjie Wang, Zhihong Li, X Steve Yao
We propose and demonstrate a novel method that uses only three sets of B-scans to accurately determine both the direction and the speed of a transversal flow using speckle decorrelation optical coherence tomography. Our tri-scan method has the advantages of high measurement speed, high spatial resolution, and insensitivity to the flow speed. By introducing error maps, we show that the flow angle inaccuracy can be minimized by choosing the measurement result with a lesser error between results obtained from the x- and y-scans...
September 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28914522/nanozyme-mediated-dual-immunoassay-integrated-with-smartphone-for-use-in-simultaneous-detection-of-pathogens
#17
Nan Cheng, Yang Song, Mohamed Maarouf Ali Zeinhom, Yu-Chung Chang, Lina Sheng, Haolin Li, Dan Du, Lei Li, Meijun Zhu, Yunbo Luo, Wentao Xu, Yuehe Lin
Nanozymes are an excellent class of optical reporters for the development of sensitive biosensors for widespread applications. In this study, platinum-palladium (Pt-Pd) nanoparticles were applied as signal amplifier in a dual-lateral flow immunoassays (LFIA) and integrated with a smartphone-based device for use in simultaneous detection of Salmonella Enteritidis and E. coli O157:H7. After optimization, the LODs were calculated to be ∼20 CFU/mL for Salmonella Enteritidis and ∼34 CFU/mL for E. coli O157:H7, respectively...
September 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28914466/supramolecular-hydro-and-ionogels-a-study-of-their-properties-and-antibacterial-activity
#18
Carla Rizzo, Rossella Arrigo, Nadka Tz Dintcheva, Giuseppe Gallo, Francesco Giannici, Renato Noto, Alberto Sutera, Paola Vitale, Francesca D'Anna
Diimidazolium-based organic salts, bearing peptides or aminoacids as anions, have been synthesized and tested for their gelling ability in biocompatible solvents. These low molecular weight salts were successfully used as gelators in phosphate saline buffer and ionic liquids. Then, properties of obtained soft materials were analyzed in terms of melting temperature and gel strength as accounted for by rheological investigation. Gel phase formation was studied using UV-vis and resonance light scattering measurements, whereas morphology of soft materials was analysed using polarized optical microscopy and scanning electron microscopy...
September 15, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28910439/spectral-domain-optical-coherence-tomographic-angiography-in-children-with-amblyopia
#19
Marcela Lonngi, Federico G Velez, Irena Tsui, Juan Pablo Davila, Mansour Rahimi, Clarissa Chan, David Sarraf, Joseph L Demer, Stacy L Pineles
Importance: Amblyopia is the most common cause of visual impairment in childhood, with a prevalence of 1% to 4% in children in the United States. To date, no studies using noninvasive optical coherence tomographic angiography (OCTA) have measured blood flow in the retinal capillary layers in children with amblyopia. Objective: To evaluate the retinal and microvascular features using OCTA in children (<18 years) with amblyopia. Design, Setting, and Participants: This observational case-control study enrolled patients from September 1, 2016, through May 31, 2017, and was conducted from September 1, 2016, through June 30, 2017, at the Stein Eye Institute at UCLA (University of California, Los Angeles)...
September 14, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28910426/optical-coherence-tomography-angiography-features-of-iris-racemose-hemangioma-in-4-cases
#20
Jason L Chien, Kareem Sioufi, Sandor Ferenczy, Emil Anthony T Say, Carol L Shields
Importance: Optical coherence tomography angiography (OCTA) allows visualization of iris racemose hemangioma course and its relation to the normal iris microvasculature. Objective: To describe OCTA features of iris racemose hemangioma. Design, Setting, and Participants: Descriptive, noncomparative case series at a tertiary referral center (Ocular Oncology Service of Wills Eye Hospital). Patients diagnosed with unilateral iris racemose hemangioma were included in the study...
September 14, 2017: JAMA Ophthalmology
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