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https://www.readbyqxmd.com/read/28823089/study-of-photophysical-properties-on-newly-synthesized-coumarin-derivatives
#1
Ashok H Sidarai, Vani R Desai, Shirajahammad M Hunagund, Mahantesha Basanagouda, Jagadish S Kadadevarmath
Herein, we have studied the photophysical properties for three newly synthesized coumarin derivatives; 4-((2,6-dibromo-4-methylphenoxy)methyl)-2H-benzo[h]chromen-2-one (DMB), 4-((3,4-dihydro-6,7-dimethoxyisoquinolin-1-yl)methyl)-6-methyl-2H-chromen-2-one (DIM) and 4-((p-tolyloxy)methyl)-6-methoxy-2H-chromen-2-one (TMC). The absorption and emission spectra for above said molecules were recorded in different solvents at room temperature in order to calculate their ground and excited state dipole moments. The ground (μ g ) and excited state dipole (μ e ) moments of these coumarin derivatives were calculated using Lippert's, Bakshiev's and Kawski-Chamma-Viallet's equations by the solvatochromic shift method, which involves a variation of Stokes shift with the solvent dielectric constant and refractive index...
August 19, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28823075/refractive-corneal-and-ocular-residual-astigmatism-distribution-in-a-german-population-and-age-dependency-the-gutenberg-health-study
#2
Alexander Karl-Georg Schuster, Norbert Pfeiffer, Andreas Schulz, René Hoehn, Katharina A Ponto, Philipp S Wild, Maria Blettner, Manfred E Beutel, Karl J Lackner, Thomas Münzel, Alireza Mirshahi
PURPOSE: Worldwide, the most frequent cause of visual impairment is uncorrected refractive error. This analysis focused on the distribution and associations of refractive, corneal and ocular residual astigmatism. METHODS: As part of the Gutenberg Health study, a population-based cross-sectional study was conducted in the general population of Germany. A comprehensive ophthalmological examination including refraction, tonometry, and Scheimpflug imaging of the anterior cornea (Pachycam) was performed...
August 19, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28822026/corneal-thickness-residual-stromal-thickness-and-its-effect-on-opaque-bubble-layer-in-small-incision-lenticule-extraction
#3
Jiaonan Ma, Yan Wang, Liuyang Li, Jiamei Zhang
PURPOSE: To evaluate the effects of the central corneal thickness (CCT) and residual stromal thickness (RST) on the formation of opaque bubble layer (OBL) during small-incision lenticule extraction (SMILE). METHODS: A total of 345 eyes from Refractive Surgery Center database at Tianjin Eye Hospital that had been subjected to SMILE surgery and followed for 6 months were included in this study and divided into OBL and OBL-free groups. Preoperative, intraoperative, and postoperative data for all eyes were evaluated and analyzed using multivariate regression analysis...
August 18, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28821726/the-switching-of-strong-spin-wave-beams-in-patterned-garnet-films
#4
R Gieniusz, P Gruszecki, M Krawczyk, U Guzowska, A Stognij, A Maziewski
The application of spin waves in communication with information encoded in amplitude and phase could replace or enhance existing microelectronic and microwave devices with significantly decreased energy consumption. Spin waves (SW) are usually transported in a magnetic material shaped to act as a waveguide. However, the implementation of SW transport and switching in plane homogeneous magnetic films and running as a narrow beam with a small divergence angle still present a challenge. We propose a realization of a strong SW switchers based on a patterned yttrium iron garnet (YIG) film that could serve as a magnonic fundamental building block...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28820930/comparison-of-minimally-invasive-strabismus-surgery-miss-and-conventional-strabismus-surgery-using-the-limbal-approach
#5
Poonam Gupta, Subhash Dadeya, Kamlesh, Vishaal Bhambhawani
PURPOSE: To compare minimally invasive strabismus surgery (MISS) with conventional strabismus surgery for horizontal recti in terms of functional outcome and complications. METHODS: A total of 40 patients requiring surgery for horizontal recti were divided into two groups: those undergoing MISS and those operated on using the conventional limbal technique. In the MISS group, two small keyhole radial cuts were made superior and inferior to the insertion of the muscle margin...
July 1, 2017: Journal of Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/28820922/a-self-assembling-peptide-gel-as-a-vitreous-substitute-a-rabbit-study
#6
Koji Uesugi, Hirokazu Sakaguchi, Yasutaka Hayashida, Ryuhei Hayashi, Koichi Baba, Yuya Suganuma, Hidenori Yokoi, Motokazu Tsujikawa, Kohji Nishida
Purpose: To evaluate a self-assembling peptide gel as a potential vitreous substitute. Methods: PanaceaGel SPG-178, a self-assembling peptide gel, was diluted with distilled water and a balanced salt solution to achieve a final peptide concentration of 0.1%. The gel's refractive index, visible light transmission rate, and rheologic properties were investigated. The gel's biocompatibility was evaluated by examining the cellular viability (live and dead staining) and proliferation rate (alamarBlue assay)...
August 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28820793/codeine-plus-acetaminophen-for-pain-after-photorefractive-keratectomy-a-randomized-double-blind-placebo-controlled-add-on-trial
#7
Vinicius B P Pereira, Renato Garcia, Andre A M Torricelli, Adriana Mukai, Samir J Bechara
BACKGROUND: Pain after photorefractive keratectomy (PRK) is significant, and the analgesic efficacy and safety of oral opioids in combination with acetaminophen has not been fully investigated in PRK trials. PURPOSE: To assess the efficacy and safety of the combination of codeine plus acetaminophen (paracetamol) versus placebo as an add-on therapy for pain control after PRK. STUDY DESIGN: Randomized, double-blind, placebo-controlled trial...
August 17, 2017: Cornea
https://www.readbyqxmd.com/read/28820597/deterministic-symmetry-breaking-of-plasmonic-nanostructures-enabled-by-dna-programmable-assembly
#8
Matthew R Jones, Kevin L Kohlstedt, Matthew N O'Brien, Jinsong Wu, George C Schatz, Chad A Mirkin
The physical properties of matter rely fundamentally on the symmetry of constituent building blocks. This is particularly true for structures that interact with light via the collective motion of their conduction electrons (i.e., plasmonic materials), where the observation of exotic optical effects, such as negative refraction and electromagnetically induced transparency, require the coupling of modes that are only present in systems with nontrivial broken symmetries. Lithography has been the predominant fabrication technique for constructing plasmonic metamaterials, as it can be used to form patterns of arbitrary complexity, including those with broken symmetry...
August 18, 2017: Nano Letters
https://www.readbyqxmd.com/read/28820160/patient-satisfaction-and-acceptance-of-spherical-equivalent-spectacles-correction-wear-in-rural-india
#9
B Sandeep Reddy, Taraprasad Das, Ghansyam S Mirdha, Nagavardhan Reddy
PURPOSE: The aim of this study was to explore the possibilities of acceptance of a ready-to-dispense spherical equivalent (SE) of spherocylindrical (SC) correction spectacles in rural India. METHODS: Snellen visual acuity with SE power of refracted SC lenses was prospectively collected from all individuals visiting vision centers in Phase 1 (vision correction accuracy) of the study conducted in two South Indian districts. The satisfaction level was recorded by asking one standard question...
August 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28817733/changing-patterns-of-cataract-services-in-north-west-nigeria-2005-2016
#10
Nasiru Muhammad, Mohammed Dantani Adamu, Mpyet Caleb, Nuhu Mohammed Maishanu, Aliyu Mohammed Jabo, Muhammad Mansur Rabiu, Covadonga Bascaran, Sunday Isiyaku, Allen Foster
PURPOSE: This study was conducted to assess the impact of the eye care programme on cataract blindness and cataract surgical services in Sokoto, Nigeria over a 12 year period 2005-2016. METHODS: Data from the 2005 population based cross-sectional study of blindness in Sokoto state was re-analysed to obtain baseline estimates of the prevalence of cataract blindness and cataract surgical coverage for persons 50 years and over in Wurno health zone. A population based survey of a representative sample of persons 50 years and over in Wurno health zone was conducted in July 2016...
2017: PloS One
https://www.readbyqxmd.com/read/28817606/distribution-and-associations-of-intraocular-pressure-in-7-and-12-year-old-chinese-children-the-anyang-childhood-eye-study
#11
Shuning Li, Shi-Ming Li, Xiao-Lei Wang, Meng-Tian Kang, Luo-Ru Liu, He Li, Shi-Fei Wei, An-Ran Ran, Siyan Zhan, Ravi Thomas, Ningli Wang
PURPOSE: To report the intraocular pressure (IOP) and its association with myopia and other factors in 7 and 12-year-old Chinese children. METHODS: All children participating in the Anyang Childhood Eye Study underwent non-contact tonometry as well as measurement of central corneal thickness (CCT), axial length, cycloplegic auto-refraction, blood pressure, height and weight. A questionnaire was used to collect other relevant information. Univariable and multivariable analysis were performed to determine the associations of IOP...
2017: PloS One
https://www.readbyqxmd.com/read/28817144/resonant-silicon-nanoparticles-for-enhancement-of-light-absorption-and-photoluminescence-from-hybrid-perovskite-films-and-metasurfaces
#12
E Tiguntseva, A Chebykin, A Ishteev, R Haroldson, B Balachandran, E Ushakova, F Komissarenko, H Wang, V Milichko, A Tsypkin, D Zuev, W Hu, S Makarov, A Zakhidov
Recently, hybrid halide perovskites have emerged as one of the most promising types of materials for thin-film photovoltaic and light-emitting devices because of their low-cost and potential for high efficiency. Further boosting their performance without detrimentally increasing the complexity of the architecture is critically important for commercialization. Despite a number of plasmonic nanoparticle based designs having been proposed for solar cell improvement, inherent optical losses of the nanoparticles reduce photoluminescence from perovskites...
August 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28816868/comparison-of-refractive-measures-of-three-autorefractors-in-children-and-adolescents
#13
Shuyu Xiong, Minzhi Lv, Haidong Zou, Jianfeng Zhu, Lina Lu, Bo Zhang, Junjie Deng, Chunxia Yao, Xiangui He, Xun Xu
SIGNIFICANCE: Our study found a good agreement between three autorefractors. Not only will readers benefit as they can now compare data measured with either device in different studies but the three devices can be used in the same study to generate one pool of data, which can be analyzed together. PURPOSE: The present study aims to evaluate the agreement of three commonly used autorefractors in children and adolescents, and the potential for their interchangeable application in a large-scale study...
August 14, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28816867/peripheral-refraction-and-aberration-profiles-with-multifocal-lenses
#14
Cathleen Fedtke, Klaus Ehrmann, Varghese Thomas, Ravi C Bakaraju
SIGNIFICANCE: The amount of central or peripheral myopic shift, as induced by different multifocal contact lenses when viewing objects at distance or near, may provide insights on the potential efficacy for slowing eye growth. PURPOSE: The present study aims to compare peripheral refraction and higher-order aberration profiles of four multifocal contact lenses with a single vision control lens. METHODS: Thirty-five myopes (age 21.2 ± 2.1 years) completed the trial, of whom 16 wore Air Optix Aqua and Proclear Multifocal Distance and Near (group 1, spherical equivalent: -2...
August 14, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28815603/registration-of-phase-contrast-images-in-propagation-based-x-ray-phase-tomography
#15
L Weber, A Hänsch, U Wolfram, A Pacureanu, P Cloetens, F Peyrin, S Rit, M Langer
X-ray phase tomography aims at reconstructing the 3D electron density distribution of an object. It offers enhanced sensitivity compared to attenuation-based X-ray absorption tomography. In propagation-based methods, phase contrast is achieved by letting the beam propagate after interaction with the object. The phase shift is then retrieved at each projection angle, and subsequently used in tomographic reconstruction to obtain the refractive index decrement distribution, which is proportional to the electron density...
August 16, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28814734/dipole-orientation-analysis-without-optical-simulation-application-to-thermally-activated-delayed-fluorescence-emitters-doped-in-host-matrix
#16
Takeshi Komino, Yuji Oki, Chihaya Adachi
The dipole orientation of guest emitters doped into host matrices is usually investigated by angular dependent photoluminescence (PL) measurements, which acquire an out-of-plane PL radiation pattern of the guest-host thin films. The PL radiation patterns generated by these methods are typically analysed by optical simulations, which require expertise to perform and interpret in the simulation. In this paper, we developed a method to calculate an orientational order parameter S without the use of full optical simulations...
August 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28813575/subclinical-decrease-in-central-inner-retinal-activity-is-associated-with-myopia-development-in-children
#17
Serena Zhe-Chuang Li, Wing-Yan Yu, Kai-Yip Choi, Christie Hang-I Lam, Yamunadevi Lakshmanan, Francisca Siu-Yin Wong, Henry Ho-Lung Chan
Purpose: To investigate the characteristics of retinal electrophysiological activity in relation to early myopia development in children. Methods: Fifty-six children aged 6 to 9 years with emmetropic refractive error (defined as ≥ -0.5 diopter [D] and ≤ +0.5 D) were recruited. Cycloplegic refraction, axial length, and global flash multifocal electroretinogram (MOFO mfERG) at 49% and 96% contrast levels were recorded in all children at their first visit. The refraction and axial length measurements were repeated after 1 year...
August 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28811551/nano-metamaterials-for-ultrasensitive-terahertz-biosensing
#18
Dong-Kyu Lee, Ji-Hun Kang, Junghoon Kwon, Jun-Seok Lee, Seok Lee, Deok Ha Woo, Jae Hun Kim, Chang-Seon Song, Q-Han Park, Minah Seo
As a candidate for a rapid detection of biomaterials, terahertz (THz) spectroscopy system can be considered with some advantage in non-destructive, label-free, and non-contact manner. Because protein-ligand binding energy is in the THz range, especially, most important conformational information in molecular interactions can be captured by THz electromagnetic wave. Based on the THz time-domain spectroscopy system, THz nano-metamaterial sensing chips were prepared for great enhancing of detection sensitivity...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811460/prevention-of-atrial-fibrillation-by-using-sarcoplasmic-reticulum-calcium-atpase-pump-overexpression-in-a-rabbit-model-of-rapid-atrial-pacing
#19
Hong Li Wang, Xian Hui Zhou, Zhi Qiang Li, Ping Fan, Qi Na Zhou, Yao Dong Li, Yue Mei Hou, Bao Peng Tang
BACKGROUND Recent research suggests that abnormal Ca2+ handling plays a role in the occurrence and maintenance of atrial fibrillation (AF). Therefore, Ca2+ release and ingestion depend on properties of the ryanodine receptor (RyR) and sarcoplasmic reticulum Ca2+ATPase2a (SERCA2a). This study aimed to detect whether SERCA2a gene overexpression has a preventive effect on atrial fibrillation caused by rapid pacing right atrium. MATERIAL AND METHODS Forty-eight New Zealand white rabbits were randomly divided into a control group, AF group, AAV9/GFP group, and AAV9/SERCA2a group...
August 16, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28811344/the-capacity-of-mycobacterium-tuberculosis-to-survive-iron-starvation-might-enable-it-to-persist-in-iron-deprived-microenvironments-of-human-granulomas
#20
Krishna Kurthkoti, Hamel Amin, Mohlopheni J Marakalala, Saleena Ghanny, Selvakumar Subbian, Alexandra Sakatos, Jonathan Livny, Sarah M Fortune, Michael Berney, G Marcela Rodriguez
This study was conducted to investigate the role of iron deprivation in the persistence of Mycobacterium tuberculosis We present evidence of iron restriction in human necrotic granulomas and demonstrate that under iron starvation M. tuberculosis persists, refractive to antibiotics and capable of restarting replication when iron is made available. Transcriptomics and metabolomic analyses indicated that the persistence of M. tuberculosis under iron starvation is dependent on strict control of endogenous Fe utilization and is associated with upregulation of pathogenicity and intrinsic antibiotic resistance determinants...
August 15, 2017: MBio
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