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Color contrast sensitivity

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https://www.readbyqxmd.com/read/28079755/macular-pigment-distribution-responses-to-high-dose-zeaxanthin-supplementation-in-patients-with-macular-telangiectasia-type-2
#1
Rene Y Choi, Aruna Gorusupudi, Kimberley Wegner, Mohsen Sharifzadeh, Werner Gellermann, Paul S Bernstein
PURPOSE: To analyze macular pigment (MP) amount and distribution in patients with macular telangiectasia Type 2 receiving oral zeaxanthin supplementation in a randomized, open-label, interventional trial. METHODS: Eight macular telangiectasia Type 2 patients were randomized to 10 mg or 20 mg of zeaxanthin per day. At each visit, best-corrected visual acuity, contrast sensitivity, fundus biomicroscopy, color fundus photography, autofluorescence imaging, optical coherence tomography, and serum carotenoid levels were tested...
January 10, 2017: Retina
https://www.readbyqxmd.com/read/28079243/serum-levels-of-vitamin-a-visual-function-and-ocular-surface-after-bariatric-surgery
#2
Luana Paula Nogueira de Araújo Brandão, Lucio Vilar, Bernardo Menelau Cavalcanti, Pedro Henrique Amorim Brandão, Tiago Eugênio Faria E Arantes, Josemberg Marins Campos
BACKGROUND: - Bariatric surgery is the most effective treatment for severe obesity, but the surgery increases the risk of developing nutritional deficiencies, such as vitamin A deficiency. In human metabolism, vitamin A plays a role in vision. OBJECTIVE: - To evaluate serum vitamin A, visual function and ocular surface of patients undergoing bariatric surgery. METHODS: - A cross-sectional and analytical study was conduced with 28 patients undergoing bariatric surgery for at least 6 months...
January 2017: Arquivos de Gastroenterologia
https://www.readbyqxmd.com/read/28076391/assessing-sexual-dicromatism-the-importance-of-proper-parameterization-in-tetrachromatic-visual-models
#3
Pierre-Paul Bitton, Kevyn Janisse, Stéphanie M Doucet
Perceptual models of animal vision have greatly contributed to our understanding of animal-animal and plant-animal communication. The receptor-noise model of color contrasts has been central to this research as it quantifies the difference between two colors for any visual system of interest. However, if the properties of the visual system are unknown, assumptions regarding parameter values must be made, generally with unknown consequences. In this study, we conduct a sensitivity analysis of the receptor-noise model using avian visual system parameters to systematically investigate the influence of variation in light environment, photoreceptor sensitivities, photoreceptor densities, and light transmission properties of the ocular media and the oil droplets...
2017: PloS One
https://www.readbyqxmd.com/read/28031067/effects-of-faba-beans-with-different-concentrations-of-vicine-and-convicine-on-egg-production-egg-quality-and-red-blood-cells-in-laying-hens
#4
M Lessire, V Gallo, M Prato, O Akide-Ndunge, G Mandili, P Marget, P Arese, G Duc
The faba bean (Vicia faba L.) is a potential source of proteins for poultry, mainly for laying hens whose protein requirements are lower than those of other birds such as growing broilers and turkeys. However, this feedstuff contains anti-nutritional factors, that is, vicine (V) and convicine (C) that are already known to reduce laying hen performance. The aim of the experiment reported here was to evaluate the effects of a wide range of dietary V and C concentrations in laying hens. Two trials were performed with laying hens fed diets including 20% or 25% of faba bean genotypes highly contrasting in V+C content...
December 29, 2016: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28030559/breeding-dispersal-by-birds-in-a-dynamic-urban-ecosystem
#5
John M Marzluff, Jack H DeLap, M David Oleyar, Kara A Whittaker, Beth Gardner
Changes in land cover during urbanization profoundly affect the diversity of bird communities, but the demographic mechanisms affecting diversity are poorly known. We advance such understanding by documenting how urbanization influences breeding dispersal-the annual movement of territorial adults-of six songbird species in the Seattle, WA, USA metropolitan area. We color-banded adults and mapped the centers of their annual breeding activities from 2000-2010 to obtain 504 consecutive movements by 337 adults...
2016: PloS One
https://www.readbyqxmd.com/read/28008209/paradigm-shifts-in-ophthalmic-diagnostics
#6
J Sebag, Alfredo A Sadun, Eric A Pierce
PURPOSE: Future advances in ophthalmology will see a paradigm shift in diagnostics from a focus on dysfunction and disease to better measures of psychophysical function and health. Practical methods to define genotypes will be increasingly important and non-invasive nanotechnologies are needed to detect molecular changes that predate histopathology. METHODS: This is not a review nor meant to be comprehensive. Specific topics have been selected to illustrate the principles of important paradigm shifts that will influence the future of ophthalmic diagnostics...
August 2016: Transactions of the American Ophthalmological Society
https://www.readbyqxmd.com/read/27998142/tunable-luminescence-contrast-of-na0-5bi4-5ti4o15-re-re-sm-pr-er-photochromics-by-controlling-the-excitation-energy-of-luminescent-centers
#7
Qiwei Zhang, Yao Zhang, Haiqin Sun, Wei Geng, Xusheng Wang, Xihong Hao, Shengli An
High luminescent switching contrast of photochromic materials is extremely important in improving the sensitivity and resolution of optical switches and high-density optical data storage devices. To date, conventional methods, such as tuning absorption and emission bands based on electron or resonance energy transfer mechanisms in well-known organic photochromic molecules or compounds, have routinely been adopted to tune luminescent switching behavior. However, these strategies and mechanisms are not effectively applied to luminescence switching in inorganic materials because their crystal structures differ strongly from those of organic materials...
December 21, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27957394/perception-of-color-emotions-for-single-colors-in-red-green-defective-observers
#8
Keiko Sato, Takaaki Inoue
It is estimated that inherited red-green color deficiency, which involves both the protan and deutan deficiency types, is common in men. For red-green defective observers, some reddish colors appear desaturated and brownish, unlike those seen by normal observers. Despite its prevalence, few studies have investigated the effects that red-green color deficiency has on the psychological properties of colors (color emotions). The current study investigated the influence of red-green color deficiency on the following six color emotions: cleanliness, freshness, hardness, preference, warmth, and weight...
2016: PeerJ
https://www.readbyqxmd.com/read/27919490/quantitative-visual-tests-after-poorly-recovered-optic-neuritis-due-to-multiple-sclerosis
#9
Erin E Longbrake, Samantha Lancia, Nhial Tutlam, Kathryn Trinkaus, Robert T Naismith
BACKGROUND: Visual dysfunction in MS can be quantified using a variety of tests. Many vision tests have not been formally evaluated among MS patients with existing visual dysfunction. OBJECTIVE: Evaluate several versions of visual acuity and contrast sensitivity tests, measures of central and peripheral vision, retina structure, electrophysiologic function, and quality of life among MS patients with moderate/severe visual dysfunction. METHODS: Cross-sectional study of 46 patients with stable, incompletely recovered optic neuritis...
November 2016: Multiple Sclerosis and related Disorders
https://www.readbyqxmd.com/read/27916716/effects-of-a-non-competitive-n-methyl-d-aspartate-nmda-antagonist-tiletamine-in-adult-zebrafish
#10
Tatiana O Kolesnikova, Sergey L Khatsko, Vadim A Shevyrin, Yuri Yu Morzherin, Allan V Kalueff
Tiletamine is a non-competitive N-methyl-d-aspartate (NMDA) receptor antagonist chemically related to ketamine and phencyclidine. A common veterinary anesthetic drug, tiletamine is currently a Schedule III controlled substance in USA. This compound exerts sedative effects in humans and animals, also having an abuse potential, toxicity and dissociative hallucinogenic properties clinically. However, the neurotropic profile of tiletamine remains poorly understood, necessitating novel models and in-vivo screens, including non-mammalian species...
December 2, 2016: Neurotoxicology and Teratology
https://www.readbyqxmd.com/read/27873373/cardiac-output-and-blood-flow-redistribution-in-the-fetus-with-d-loop-transposition-of-the-great-arteries-and-intact-ventricular-septum-insights-into-the-pathophysiology
#11
Max E Godfrey, Kevin G Friedman, Monika Drogosz, Abraham M Rudolph, Wayne Tworetzky
OBJECTIVES: Although the postnatal physiology of D-loop transposition of the great arteries with intact ventricular septum (DTGA-IVS) is well established, little is known about fetal DTGA-IVS. In the normal fetus, the pulmonary valve (PV) is larger than the aortic valve (AoV), there is exclusive right to left flow at the foramen ovale (FO) and ductus arteriosus (DA), and the left ventricle (LV) ejects 40% of combined ventricular output (CVO) through the aorta, primarily to the brain. In DTGA-IVS, the LV ejects O2 -rich blood to the pulmonary artery, theoretically leading to pulmonary vasodilation, increased branch pulmonary arterial flow and reduced DA flow...
November 22, 2016: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/27872754/evaluation-of-contrast-sensitivity-chromatic-vision-and-reading-ability-in-patients-with-primary-open-angle-glaucoma
#12
Maria P Bambo, Blanca Ferrandez, Noemi Güerri, Isabel Fuertes, Beatriz Cameo, Vicente Polo, Jose M Larrosa, Elena Garcia-Martin
Purpose. To compare contrast sensitivity, acquired color vision deficiency, and reading ability in patients with glaucoma at different stages of the disease and to establish correlations between visual field parameters and visual function scores. Methods. This prospective cross-sectional study included 121 glaucoma patients. Subjects with a diagnosis of chronic open angle glaucoma were recruited and classified according to Hodapp-Parrish-Anderson criteria. Patients with severe visual field defects were excluded because they were older, which could bias the interpretation of visual function tests...
2016: Journal of Ophthalmology
https://www.readbyqxmd.com/read/27851900/residual-perception-of-biological-motion-in-cortical-blindness
#13
Nicolas Ruffieux, Meike Ramon, Junpeng Lao, Françoise Colombo, Lisa Stacchi, François-Xavier Borruat, Ettore Accolla, Jean-Marie Annoni, Roberto Caldara
From birth, the human visual system shows a remarkable sensitivity for perceiving biological motion. This visual ability relies on a distributed network of brain regions and can be preserved even after damage of high-level ventral visual areas. However, it remains unknown whether this critical biological skill can withstand the loss of vision following bilateral striate damage. To address this question, we tested the categorization of human and animal biological motion in BC, a rare case of cortical blindness after anoxia-induced bilateral striate damage...
2016: Neuropsychologia
https://www.readbyqxmd.com/read/27829050/high-resolution-ultrasound-switchable-fluorescence-imaging-in-centimeter-deep-tissue-phantoms-with-high-signal-to-noise-ratio-and-high-sensitivity-via-novel-contrast-agents
#14
Bingbing Cheng, Venugopal Bandi, Ming-Yuan Wei, Yanbo Pei, Francis D'Souza, Kytai T Nguyen, Yi Hong, Baohong Yuan
For many years, investigators have sought after high-resolution fluorescence imaging in centimeter-deep tissue because many interesting in vivo phenomena-such as the presence of immune system cells, tumor angiogenesis, and metastasis-may be located deep in tissue. Previously, we developed a new imaging technique to achieve high spatial resolution in sub-centimeter deep tissue phantoms named continuous-wave ultrasound-switchable fluorescence (CW-USF). The principle is to use a focused ultrasound wave to externally and locally switch on and off the fluorophore emission from a small volume (close to ultrasound focal volume)...
2016: PloS One
https://www.readbyqxmd.com/read/27828102/perifoveal-l-and-m-cone-driven-temporal-contrast-sensitivities-at-different-retinal-illuminances
#15
Cord Huchzermeyer, Jan Kremers
We established a protocol using a well-established LED stimulator to measure temporal contrast sensitivities driven by sine-wave modulation of L- and M-cones in the perifovea using triple silent substitution. The stimulus was presented in an annular field (2° inner diameter, 13° outer diameter). We validated this technique by studying the contrast sensitivity of three color normal observers at 10 different temporal frequencies (between 1 and 28 Hz) over a large range of retinal illuminances (between 0.07 and 587 phot Td), spanning the complete mesopic range...
October 1, 2016: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/27813519/comparison-of-vision-related-quality-of-life-in-primary-open-angle-glaucoma-and-dry-type-age-related-macular-degeneration
#16
S Karadeniz Ugurlu, A E Kocakaya Altundal, M Altin Ekin
PurposeTo compare quality of life (QoL) in patients with primary open-angle glaucoma (POAG) and dry-type age-related macular degeneration (AMD) with similar best-corrected visual acuity.MethodsAge-, sex-, and visual acuity-matched POAG and dry AMD patients were included in the study. Each patient performed 24-2 and 10-2 SITA standard visual field tests. Contrast sensitivity was evaluated with CSV-1000 HGT instrument. The 25 item National Eye Institute Visual Function Questionnaire (NEI-VFQ-25) was used to analyze QoL...
November 4, 2016: Eye
https://www.readbyqxmd.com/read/27794166/a-new-procedure-for-a-fast-soft-staining-of-bn-pages-on-photosynthetic-complexes
#17
Domenica Farci, Joanna Kirkpatrick, Dario Piano
We report a fast and sensitive procedure for Blue Native PAGE staining, in which the conventional staining step with Coomassie Brilliant Blue is avoided. After running, a short exposure to a mix of polar protic solvents (ethanol and acetic acid) leads to a fast and selective removal of the dye from the migration front and a specific binding to the protein bands, while the rest undergo a selective and complete background removal, leading to an intense contrast. This single step staining-destaining technique is useful in protein samples that bind colored cofactors such as photosystems, which can be selectively discerned by their characteristic green color...
October 29, 2016: Electrophoresis
https://www.readbyqxmd.com/read/27789946/real-time-colorimetric-detection-of-dna-methylation-of-the-pax1-gene-in-cervical-scrapings-for-cervical-cancer-screening-with-thiol-labeled-pcr-primers-and-gold-nanoparticles
#18
Jin Huang, Yu-Ligh Liou, Ya-Nan Kang, Zhi-Rong Tan, Ming-Jing Peng, Hong-Hao Zhou
BACKGROUND: DNA methylation can induce carcinogenesis by silencing key tumor suppressor genes. Analysis of aberrant methylation of tumor suppressor genes can be used as a prognostic and predictive biomarker for cancer. In this study, we propose a colorimetric method for the detection of DNA methylation of the paired box gene 1 (PAX1) gene in cervical scrapings obtained from 42 patients who underwent cervical colposcopic biopsy. METHODS: A thiolated methylation-specific polymerase chain reaction (MSP) primer was used to generate MSP products labeled with the thiol group at one end...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27773657/contrast-dependence-of-saccadic-blanking-and-landmark-effects
#19
Kazumichi Matsumiya, Masayuki Sato, Satoshi Shioiri
Two phenomena have been reported to affect the perceived displacement of a visual target during saccadic eye movements: the blanking effect and landmark effect. In the blanking effect, temporarily blanking the target after a saccade improves displacement judgments. In the landmark effect, illusory target displacement occurs when a continuously presented landmark is displaced during a saccade, and the target is temporarily blanked after the saccade without displacement. We show that the strengths of the blanking and landmark effects vary with stimulus contrast...
December 2016: Vision Research
https://www.readbyqxmd.com/read/27767982/intrasurgical-dignity-assessment-of%C3%A2-hepatic%C3%A2-tumors-using-semi-quantitative-strain-elastography-and-contrast-enhanced-ultrasound-for-optimisation-of-liver-tumor%C3%A2-surgery
#20
N Platz Batista da Silva, M Schauer, M Hornung, S Lang, L P Beyer, I Wiesinger, C Stroszczynski, E M Jung
OBJECTIVE: To evaluate the efficacy of strain elastography (SE) using semi-quantitative measurement methods compared to constrast enhanced ultrasound during liver tumor surgery (Io-CEUS) for dignity assessment of focal liver lesions(FLL). MATERIAL AND METHODS: Prospective data acquisition and retrospective analysis of US data of 100 patients (116 lesions) who underwent liver tumor surgery between 10/2010 and 03/2016. Retrospective reading of SE color patterns was performed establishing groups depending on dominant color (>50% blue = stiff, inhomogenous, >50% yellow/red/green = soft tissue)...
October 20, 2016: Clinical Hemorheology and Microcirculation
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