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https://www.readbyqxmd.com/read/28107743/high-sensitivity-four-layer-polymer-fiber-optic-evanescent-wave-sensor
#1
Xin Xin, Nianbing Zhong, Qiang Liao, Yanyan Cen, Ruohua Wu, Zhengkun Wang
We present a novel four-layer structure consisting of bottom, second, third, and surface layers in the sensing region, for a D-shaped step-index fiber-optic evanescent wave (FOEW) sensor. To reduce the background noise, the surface of the longitudinal section in the D-shaped region is coated with a light-absorbing film. We check the morphologies of the second and surface layers, examine the refractive indices (RIs) of the third and surface layers, and analyze the composition of the surface layer. We also investigate the effects of the thicknesses and RIs of the third and surface layers and the LA film on the light transmission and sensitivity of the FOEW sensors...
January 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28107616/superhydrophilic-antireflective-periodic-mesoporous-organosilica-coating-on-flexible-polyimide-substrate-with-strong-abrasion-resistance
#2
Jing Wang, Cong Zhang, Chunming Yang, Ce Zhang, Mengchao Wang, Jing Zhang, Yao Xu
Superhydrophilic antireflective periodic mesoporous organosilica (PMO) coating was prepared on flexible polyimide substrate via solvent-evaporation-induced self-assembly (SEISA) method, in which tetraethoxysilane (TEOS) and a special bridged silsesquioxane were used as reactants. The bridged silsesquioxane, EG-BSQ, was synthesized through the stoichiometric reaction between 3-glycidoxyporpyltrimethoxysilane (GPTMS) and ethylene diamine (EDA) at 60 (○)C with no catalyst. Under the influence of surfactant, TEOS and EG-BSQ co-condensed and enclosed the ordered mesporous in the coating...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28107389/effect-of-axial-eye-length-on-retinal-vessel-parameters-in-6-to-12-year-old-malay-girls
#3
Evelyn Li Min Tai, Ling-Jun Li, Wan Hitam Wan-Hazabbah, Tien-Yin Wong, Ismail Shatriah
PURPOSE: Retinal vessel analysis is affected by both systemic and ocular factors. Malays are the major ethnicity in South East Asia. Data on the retinal microvasculature in Malays is limited, especially among children. We aim to evaluate the influence of ocular biometry on retinal vessel parameters in young Malay girls. METHODS: This was a cross-sectional, hospital-based study involving 86 Malay girls aged 6 to 12 years old in Hospital Universiti Sains Malaysia from 2015-2016...
2017: PloS One
https://www.readbyqxmd.com/read/28107088/the-national-eye-survey-of-trinidad-and-tobago-nestt-rationale-objectives-and-methodology
#4
Tasanee Braithwaite, Neville Q Verlander, Debra Bartholomew, Petra Bridgemohan, Kevin McNally, Allana Roach, Subash Sharma, Deo Singh, Konrad Pesudovs, Surujpal Teelucksingh, Christine Carrington, Samuel Ramsewak, Rupert Bourne
PURPOSE: This paper describes the rationale, study design and procedures of the National Eye Survey of Trinidad and Tobago (NESTT). The main objective of this survey is to obtain prevalence estimates of vision impairment and blindness for planning and policy development. METHODS: A population-based, cross-sectional survey was undertaken using random multistage cluster sampling, with probability-proportionate-to-size methods. Eligible participants aged 5 years and older were sampled from the non-institutional population in each of 120 cluster segments...
January 20, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28106890/assessment-of-a-new-hydrophilic-acrylic-supplementary-iol-for-sulcus-fixation-in-pseudophakic-cadaver-eyes
#5
N Reiter, L Werner, J Guan, J Li, K T Tsaousis, N Mamalis, S Srinivasan
PurposeManagement of refractive errors after cataract surgery includes spectacles or contact lens, secondary laser vision correction, intraocular lens (IOL) exchange, or piggyback lens implantation. We evaluated for the first time a single-piece hydrophilic acrylic IOL designed for supplementary sulcus fixation in postmortem pseudophakic human eyes.MethodsPseudophakic human cadaver eyes were imaged by anterior segment optical coherence tomography (AS-OCT) to assess position of the primary IOL. Eyes were prepared as per the Miyake-Apple technique...
January 20, 2017: Eye
https://www.readbyqxmd.com/read/28106850/au-graphene-hybrid-plasmonic-nanostructure-sensor-based-on-intensity-shift
#6
Raed Alharbi, Mehrdad Irannejad, Mustafa Yavuz
Integrating plasmonic materials, like gold with a two-dimensional material (e.g., graphene) enhances the light-material interaction and, hence, plasmonic properties of the metallic nanostructure. A localized surface plasmon resonance sensor is an effective platform for biomarker detection. They offer a better bulk surface (local) sensitivity than a regular surface plasmon resonance (SPR) sensor; however, they suffer from a lower figure of merit compared to that one in a propagating surface plasmon resonance sensors...
January 19, 2017: Sensors
https://www.readbyqxmd.com/read/28106517/traditional-invasive-and-synchrotron-based-non-invasive-assessments-of-3d-printed-hybrid-cartilage-constructs
#7
Adeola Deborah Olubamiji, Ning Zhu, Tuanjie Chang, Chijioke Nwankwo, Zohreh Izadifar, Ali Honaramooz, Daniel Chen, B Frank Eames
Three-dimensional (3D)-printed constructs made of polycaprolactone (PCL) and chondrocyte-impregnated alginate hydrogel (hybrid cartilage constructs) mimic the biphasic nature of articular cartilage, offering promise for cartilage tissue engineering (CTE) applications. However, the regulatory pathway for medical device development requires validation of such constructs through in vitro bench tests and in vivo preclinical examinations premarket approval. Furthermore, non-invasive imaging techniques are required for effective evaluation of the progress of these cartilage constructs, especially when implanted in animal models or human subjects...
January 20, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28106452/refractive-index-seen-by-a-probe-beam-interacting-with-a-laser-plasma-system
#8
D Turnbull, C Goyon, G E Kemp, B B Pollock, D Mariscal, L Divol, J S Ross, S Patankar, J D Moody, P Michel
We report the first complete set of measurements of a laser-plasma optical system's refractive index, as seen by a second probe laser beam, as a function of the relative wavelength shift between the two laser beams. Both the imaginary and real refractive index components are found to be in good agreement with linear theory using plasma parameters measured by optical Thomson scattering and interferometry; the former is in contrast to previous work and has implications for crossed-beam energy transfer in indirect-drive inertial confinement fusion, and the latter is measured for the first time...
January 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28106234/improving-patient-assessed-outcomes-after-cataract-surgery
#9
Behrad Samadi, Mats Lundström, Maria Kugelberg
PURPOSE: To identify and evaluate possible causes of poor patient-reported visual function after cataract surgery. METHODS: We obtained retrospective data from the Swedish National Cataract Register on patient self-assessed visual function before and after cataract surgery based on the Catquest-9SF questionnaire. We identified patients who self-reported similar or more difficulties postoperatively than preoperatively, and looked at possible causative variables such as sex, age, preoperative and postoperative corrected distance visual acuity (CDVA) and refractive errors, and ocular comorbidity...
January 3, 2017: European Journal of Ophthalmology
https://www.readbyqxmd.com/read/28105606/enhanced-forward-scattering-of-ellipsoidal-dielectric-nanoparticles
#10
Zhonghua Wang, Ning An, Fei Shen, Hongping Zhou, Yongxuan Sun, Zhaoneng Jiang, Yanhua Han, Yan Li, Zhongyi Guo
Dielectric nanoparticles can demonstrate a strong forward scattering at visible and near-infrared wavelengths due to the interaction of optically induced electric and magnetic dipolar resonances. For a spherical nanoparticle, the first Kerker's condition within dipole approximation can be realized, where backward scattering can reach zero. However, for this type of dielectric sphere, maximum forward scattering without backward scattering cannot be realized by modulating the refractive index and particle size of this nanoparticle...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28105497/comparison-of-traditional-and-emerging-surgical-therapies-for-lower-urinary-tract-symptoms-in-men-a-review
#11
Christopher Smith, Paul Craig, Shayandokht Taleb, Shamar Young, Jafar Golzarian
Lower urinary tract symptoms (LUTS) are one of the most common health issues in men and pose a significant economic challenge in healthcare. Transurethral resection of the prostate (TURP) remains the gold standard surgical treatment for medically refractive LUTS secondary to benign prostatic hyperplasia. The institution of medical therapy and the development of several minimally invasive surgical therapies (MISTs) began in the 1980's and 1990's. Together, these therapies brought about a change in the natural course of the disease, stimulating investigation into the economic consequences of various management approaches...
January 19, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/28104501/esotropia-with-an-accommodative-component-after-surgery-for-infantile-esotropia-compared-to-primary-accommodative-esotropia
#12
Kyung-Ah Park, Sei Yeul Oh
PURPOSE: To compare the clinical outcomes of patients with an esotropia with an accommodative component after infantile esotropia surgery and patients with primary refractive accommodative esotropia. METHODS: The medical records of patients with postoperative (secondary group) and primary refractive accommodative esotropia (primary group) were reviewed retrospectively. Changes in ocular alignment, refractive error, weaning rate, decompensation rate over time, and sensory outcomes were compared...
January 16, 2017: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/28102741/tutorial-on-biostatistics-linear-regression-analysis-of-continuous-correlated-eye-data
#13
Gui-Shuang Ying, Maureen G Maguire, Robert Glynn, Bernard Rosner
PURPOSE: To describe and demonstrate appropriate linear regression methods for analyzing correlated continuous eye data. METHODS: We describe several approaches to regression analysis involving both eyes, including mixed effects and marginal models under various covariance structures to account for inter-eye correlation. We demonstrate, with SAS statistical software, applications in a study comparing baseline refractive error between one eye with choroidal neovascularization (CNV) and the unaffected fellow eye, and in a study determining factors associated with visual field in the elderly...
January 19, 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/28101403/quantitative-assessment-of-hemodynamic-and-structural-characteristics-of-in-vivo-brain-tissue-using-total-diffuse-reflectance-spectrum-measured-in-a-non-contact-fashion
#14
Yinchen Song, Sarahy Garcia, Yisel Frometa, Jessica C Ramella-Roman, Mohammad Soltani, Mohamed Almadi, Jorge J Riera, Wei-Chiang Lin
Here we present a new methodology that investigates the intrinsic structural and hemodynamic characteristics of in vivo brain tissue, in a non-contact fashion, and can be easily incorporated in an intra-operative environment. Within this methodology, relative total diffuse reflectance spectra (RTD(λ)) were acquired from targets using a hybrid spectroscopy imaging system. A spectral interpretation algorithm was subsequently applied to RTD(λ) to retrieve optical properties related to the compositional and structural characteristics of each target...
January 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28101160/facile-mechanical-shaking-method-is-an-improved-isolation-approach-for-islet-preparation-and-transplantation
#15
Nina Yin, Tao Chen, Yuling Yu, Yongming Han, Fei Yan, Zhou Zheng, Zebin Chen
Successful islet isolation is crucial for islet transplantation and cell treatment for type 1 diabetes. Current isolation methods are able to obtain 500-1,000 islets per rat, which results in a waste of ≥50% of total islets. In the present study, a facile mechanical shaking method for improving islet yield (up to 1,500 per rat) was developed and summarized, which was demonstrated to be more effective than the existing well-established stationary method. The present results showed that isolated islets have a maximum yield of 1,326±152 when shaking for 15 min for the fully-cannulated pancreas...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28101039/multifocal-toric-intraocular-lens-for-traumatic-cataract-in-a-child
#16
Yanfeng Zeng, Licheng Fan, Peirong Lu
A child suffering from traumatic cataract and corneal astigmatism of 2.14 D had a phacoemulsification operation and implantation of a ReSTOR Toric intraocular lens (IOL) to correct the astigmatism. The primary outcome measurements were the uncorrected distance visual acuity (UDVA), uncorrected near vision at 40 cm, intraocular pressure, spherical equivalent refraction, residual astigmatism, corneal astigmatism, presence of unusual optical phenomena, and use of spectacles. At 7 months postoperatively, UDVA was maintained between 16/20 and 24/20, near vision was between J1 and J3, residual spherical refraction was 0-0...
September 2016: Case Reports in Ophthalmology
https://www.readbyqxmd.com/read/28100483/electrophysiological-changes-in-12-year-old-children-born-mlp-reduced-vep-amplitude-in-mlp-children
#17
Lina H Raffa, Josefin Nilsson, Jovanna Dahlgren, Marita Andersson Grönlund
AIM: To study the electrophysiological changes in relation to fundus morphology in moderate-to-late preterm (MLP) children with no previous history of retinopathy of prematurity. METHODS: Visual acuity (VA), refraction and fundus variables measured by optical coherence tomography, pattern reversal visual evoked potentials and full-field electroretinography (ff-ERG) were obtained from 22 twelve-year-old MLP children (11 male, 11 female) and 21 full-term controls...
January 18, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28100480/detection-of-posterior-vortex-veins-in-eyes-with-pathologic-myopia-by-ultra-widefield-indocyanine-green-angiography
#18
Muka Moriyama, Kejia Cao, Satoko Ogata, Kyoko Ohno-Matsui
AIMS: To analyse the characteristics of posterior vortex veins detected in highly myopic eyes by wide-field indocyanine green angiography (ICGA). METHODS: One hundred and fifty-eight consecutive patients (302 eyes) with high myopia (myopic refractive error >8.0 dioptres (D) or axial length ≥26.5 mm) were studied. Wide-field ICGA was performed with the Spectralis HRA module. RESULTS: Posterior vortex veins were found in 80 eyes (26%)...
January 18, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28099283/the-characteristics-of-excimer-laser-refractive-surgery-candidates
#19
Hassan Hashemi, Mehdi Khabazkhoob, Reza Pakzad, Abbasali Yekta, Marzieh Nojomi, Payam Nabovati
PURPOSE: To determine the demographic and refractive characteristics of excimer laser refractive surgery candidates in Iran. METHODS: This was a cross-sectional study between 2010 and 2014. All information was collected from 28 centers randomly selected from 12 provinces. Then, for each season of the year, one week was chosen through simple random selection, and within each week, 3 days were again chosen randomly. All excimer laser surgical procedures performed during these 3 days were identified by training staff, and data were extracted from patient charts...
January 17, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28098223/dispersion-of-nonresonant-third-order-nonlinearities-in-silicon-carbide
#20
Francesco De Leonardis, Richard A Soref, Vittorio M N Passaro
In this paper we present a physical discussion of the indirect two-photon absorption (TPA) occuring in silicon carbide with either cubic or wurtzite structure. Phonon-electron interaction is analyzed by finding the phonon features involved in the process as depending upon the crystal symmetry. Consistent physical assumptions about the phonon-electron scattering mechanisms are proposed in order to give a mathematical formulation to predict the wavelength dispersion of TPA and the Kerr nonlinear refractive index n2...
January 18, 2017: Scientific Reports
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