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Jacek Turski
I elaborate binocular geometry with a novel eye model that incorporates the fovea's temporalward displacement and the cornea and the lens' misalignment. The formulated binocular correspondence results in longitudinal horopters that are conic sections resembling empirical horopters. When the eye model's asymmetry parameters' range is that which is observed in healthy eyes, abathic distance also falls within its experimentally observed range. This range in abathic distance is similar to that of the vergence resting position distance...
July 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Mohit Butaney, Nannan Thirumavalavan, Mark S Hockenberry, E Will Kirby, Alexander W Pastuszak, Larry I Lipshultz
Penile duplex ultrasound (PDU), combined with pharmacologic stimulation of erection, is the gold standard for the evaluation of multiple penile conditions. A 30-question electronic survey was distributed to members of the International Society for Sexual Medicine (ISSM). The survey assessed the variability in current PDU practice patterns, technique, and interpretation. Chi-square test was used to determine the association between categorical variables. Approximately 9.5% of all 1996 current ISSM members completed the survey...
August 14, 2018: International Journal of Impotence Research
Khaled Fellah, Mohamed Guiatni
Spatial disorientation and visual channel saturation are defined as critical situations encountered by military pilots. Such subjects are interesting research areas likely to create innovative systems able to surmount obstacles of this kind. The integration of new stimulation techniques (sensory substitute, adjunct for visual and audio feedback) may be considered to make the visual channel better. This contribution may help in integrating tactile stimulation to improve or substitute the visual channel. It may also help to better interpret the spatial disorientation awareness signals and the vestibulo-ocular response limitations...
August 13, 2018: IEEE Transactions on Haptics
Daniel S Cook, Guy J Clarkson, Daniel M Dawson, Sharon E Ashbrook, Janet M Fisher, David Thompsett, David M Pickup, Alan V Chadwick, Richard I Walton
The rhodium(III) hydrogarnets Ca3 Rh2 (OH)12 and Sr3 Rh2 (OH)12 crystallize as polycrystalline powders under hydrothermal conditions at 200 °C from RhCl3 ·3H2 O and either Ca(OH)2 or Sr(OH)2 in either 12 M NaOH or KOH. Rietveld refinements against synchrotron powder X-ray diffraction (XRD) data allow the first crystal structures of the two materials to be determined. If BaO2 is used as a reagent and the concentration of hydroxide increased to hydroflux conditions (excess NaOH), then single crystals of a new complex rhodium hydroxide, BaNaRh(OH)6 , are formed in a phase-pure sample, with sodium included from the flux...
August 14, 2018: Inorganic Chemistry
Paris Ning, Ronald Soong, Wolfgang Bermel, Daniel Lane, Myrna J Simpson, André J Simpson
Many natural and environmental samples contain combinations of liquids, gels, and solids, yet quantification in the intact state and across multiple phases is highly challenging. Comprehensive multiphase nuclear magnetic resonance (CMP-NMR) combines all the capabilities of high-resolution magic angle spinning (HR-MAS), with the addition of full solids power handling, permitting all phases (i.e., mixtures of liquids, gels, and solids) to be studied and differentiated in intact samples without pre-treatment or extraction...
August 13, 2018: Analytical and Bioanalytical Chemistry
Alessandro Mauro, Nicola Massarotti, Salahudeen Mohamed, Ignacio Rodríguez Uña, Mario R Romano, Vito Romano
The present work analyses the performance of four glaucoma drainage devices, by means of a novel patient-oriented numerical procedure. The procedure is based on the three-dimensional geometry reconstruction from the stacks of tomographic images of a human eye, at different angles, on meshing and on thermo-fluid dynamics modelling activities, carried out on the reconstructed computational domain. The current three-dimensional eye model considers Anterior Chamber (AC), Trabecular Meshwork (TM), Schlemm's Canal (SC) and Collector Channels (CC), making use of Generalized Porous Medium (GPM) approach for modelling ocular porous tissue and cavities...
August 12, 2018: International Journal for Numerical Methods in Biomedical Engineering
Nasser A Alsobaie, Asma I Almohizea, Yahya Al-Zahrani, Rizwan Malik
Purpose: To report the effectiveness of Goniosynechialysis (GSL) treating elevated intraocular pressure (IOP) in an aphakic eye with peripheral anterior synechiae (PAS) formation after vitrectomy. Observations: A 39-year-old gentleman with history of lamellar keratoplasty for corneal ectasia and blunt trauma to the right eye necessitating vitrectomy and lensectomy presented to our glaucoma unit with a secondary angle closure and an IOP of 50 mmHg. This was successfully treated with GSL and one year after surgery, the patient maintains a normal IOP without the use of medication...
December 2018: American Journal of Ophthalmology Case Reports
Gerhard K P Bittermann, Adrianus P de Ruiter, Arnold Jn Bittermann, Aebele B Mink van de Molen, Robert Jj van Es, Ron Koole, Antoine Jwp Rosenberg
OBJECTIVE: To evaluate midfacial growth and dental arch relationships in patients treated for bilateral cleft lip and palate (BCLP). MATERIALS AND METHODS: Data were collected from all patients with BCLP treated at our hospital between 2004 and 2014, with or without premaxillary osteotomy (PO). Dental casts for pre-secondary alveolar bone grafting with PO (SABG + PO) and end-point dental casts were analyzed using the BAURU yardstick scoring system. Pre-SABG + PO, post-SABG + PO, and end-point SABG + PO lateral cephalograms were analyzed...
July 26, 2018: Journal of Cranio-maxillo-facial Surgery
Tomasz Cudejko, Martin van der Esch, Josien C van den Noort, Judith J M Rijnhart, Marike van der Leeden, Leo D Roorda, Willem Lems, Gordon Waddington, Jaap Harlaar, Joost Dekker
OBJECTIVE: To evaluate whether improvement of proprioception, pain or dynamic knee instability mediate the effect of wearing a soft knee brace on activity limitations in persons with knee osteoarthritis (OA). METHODS: Exploratory analysis from 44 participants with knee OA and self-reported knee instability in a laboratory trial evaluating the effect of wearing a commercially available soft knee brace. Activity limitations were assessed with the 10-meter walk test and the Get up and Go test...
August 12, 2018: Arthritis Care & Research
Sunee Chansangpetch, Kevin Lau, Claudio I Perez, Ngoc Nguyen, Travis C Porco, Shan C Lin
PURPOSE: To evaluate the effectiveness of trabecular microbypass stent (iStent) implantation in combined mechanism glaucoma (CMG). DESIGN: Retrospective cohort study METHODS: We reviewed the medical charts of patients with the following scenarios: (1) primary open angle glaucoma (POAG) undergoing phacoemulsification (PE), (2) POAG undergoing PE with iStent (POAG-PE/iStent), (3) CMG undergoing PE (CMG-PE), and (4) CMG undergoing PE with iStent (CMG-PE/iStent). CMG was defined as narrow angle glaucoma patients whose angle had opened after iridotomy...
August 8, 2018: American Journal of Ophthalmology
Themistocles S Protopsaltis, Bassel G Diebo, Renaud Lafage, Jensen K Henry, Justin S Smith, Justin K Scheer, Daniel M Sciubba, Peter G Passias, Han Jo Kim, D Kojo Hamilton, Alexandra Soroceanu, Eric O Klineberg, Christopher P Ames, Christopher I Shaffrey, Shay Bess, Robert A Hart, Frank J Schwab, Virginie Lafage
STUDY DESIGN: Retrospective analysis. OBJECTIVE: To define thoracic compensation and investigate its association with postoperative reciprocal thoracic kyphosis and proximal junctional kyphosis (PJK) SUMMARY OF BACKGROUND DATA.: Adult spinal deformity (ASD) patients recruit compensatory mechanisms like pelvic retroversion and knee flexion. However, thoracic hypokyphosis is a less recognized compensatory mechanism. METHODS: Patients enrolled in a multicenter ASD registry undergoing fusions to the pelvis with UIV between T9-L1 were included...
August 9, 2018: Spine
Elaine M Wells-Gray, Stacey S Choi, Mark Slabaugh, Paul Weber, Nathan Doble
PURPOSE: To examine the microstructural changes in the inner nuclear layer (INL) and ganglion cell layer (GCL) in a primary open angle glaucoma (POAG) patient at 2 time points, 4 months apart. PATIENTS AND METHODS: This case-control study (one POAG patient and one normal control) used the single cell, three-dimensional volumetric imaging capability of an adaptive optics-optical coherence tomography-scanning laser ophthalmoscopy system to examine the inner retina...
August 7, 2018: Journal of Glaucoma
Thomas Dos'Santos, Christopher Thomas, Paul Comfort, Paul A Jones
Changes of direction (CODs) are key manoeuvres linked to decisive moments in sport and are also key actions associated with lower limb injuries. During sport athletes perform a diverse range of CODs, from various approach velocities and angles, thus the ability to change direction safely and quickly is of great interest. To our knowledge, a comprehensive review examining the influence of angle and velocity on change of direction (COD) biomechanics does not exist. Findings of previous research indicate the biomechanical demands of CODs are 'angle' and 'velocity' dependent and are both critical factors that affect the technical execution of directional changes, deceleration and reacceleration requirements, knee joint loading, and lower limb muscle activity...
August 9, 2018: Sports Medicine
Joanne L Kemp, Kay M Crossley, Rintje Agricola, Fenna Geuskens, Marienke van Middelkoop
Background: The prevalence of radiographic hip osteoarthritis (OA), and its relationship with outcomes after hip arthroscopy is unclear. Objectives: The aims of this study were to: (i) describe the prevalence of OA and cam deformity 12-24 months post hip arthroscopy; (ii) to determine the association between radiographic OA and cam deformity, surgical and clinical findings and symptoms; and (iii) describe the differences between legs for radiological and clinical findings...
April 2018: International Journal of Sports Physical Therapy
Chiara Zoppirolli, Lorenzo Bortolan, Federico Stella, Gennaro Boccia, Hans-Christer Holmberg, Federico Schena, Barbara Pellegrini
Introduction: Although short-term (approximately 10-min) fatiguing DP has been reported not to alter the joint kinematics or displacement of the centre of mass (COM) of high-level skiers, we hypothesize that prolonged DP does change these kinematics, since muscular strength is impaired following endurance events lasting longer than 2 h. Methods: During the 58-km Marcialonga race in 2017, the fastest 15 male skiers were videofilmed (100 fps, FHD resolution in the sagittal plane) on two 20-m sections (inclines: 0...
2018: Frontiers in Physiology
Kamsul Abraha, Agung Bambang Setio Utomo
A theoretical analysis and computational study of biomaterial sample detection with surface plasmon resonance (SPR) phenomenon spectroscopy are presented in this work with the objective of achieving more sensitive detection. In this paper, a Fe₃O₄@Au core-shell, a nanocomposite spherical nanoparticle consisting of a spherical Fe₃O₄ core covered by an Au shell, was used as an active material for biomaterial sample detection, such as for blood plasma, haemoglobin (Hb) cytoplasm and lecithin, with a wavelength of 632...
August 7, 2018: Biosensors
Kostiantyn V Kravchyk, Laura Piveteau, Riccarda Caputo, Meng He, Nicholas P Stadie, Maryna I Bodnarchuk, Rainer T Lechner, Maksym V Kovalenko
At present, the technical progress of secondary batteries employing metallic magnesium as the anode material has been severely hindered due to the low oxidation stability of state-of-the-art Mg electrolytes, which cannot be used to explore high voltage (> 3 V vs. Mg2+/Mg) cathode materials. All known electrolytes based on oxidatively stable solvents and salts, such as Mg(ClO4)2 and Mg bis(trifluoromethanesulfonimide) react with the metallic magnesium anode, forming a passivating layer at its surface and preventing the reversible plating/stripping of Mg...
August 7, 2018: ACS Nano
Hanjo Ko, Joseph E Bavaria, Andreas Habertheuer, John G Augoustides, Mary Siki, Melanie Freas, Caroline Komlo, Karianna Milewski, Nimesh D Desai, Wilson Y Szeto, Prashanth Vallabhajosyula
BACKGROUND: In bicuspid aortic valve (BAV) patients with non-aneurysmal root (<45mm) and severe aortic insufficiency (AI), external subannular aortic ring (ESAR) is being increasingly utilized for annular stabilization, compared to traditional subcommissural annuloplasty (SCA). To this date, there is no comparative study assessing functional equivalence or superiority of ESAR over SCA. METHODS: From 2003 to 2017, 139 patients underwent type I BAV repair, of which 50 patients underwent concomitant SCA and 24 underwent ESAR...
August 4, 2018: Annals of Thoracic Surgery
Volkan Ciftci, Aslıhan Uzel, Muharrem Cem Dogan
OBJECTIVE: A lower lingual arch is usually recommended as a holding device to maintain arch length and to prevent mesial migration of the mandibular first molars. Despite its widespread use, comparatively little is known about the effects of a lower lingual holding arch on preservation of lower arch dimensions and tooth position and the impact of the device on mandibular growth. The aim of this study is to evaluate the skeletal and dental effects of the lower lingual holding arch with regard to arch dimension, positions of mandibular molars and incisors, and usual mandibular growth...
August 7, 2018: Journal of Clinical Pediatric Dentistry
Hung Hsun Lee, Martynas Gavutis, Živilė Ruželė, Ramunas Valiokas, Bo Liedberg
We describe herein a series of self-assembled monolayers (SAMs) on gold designed for adjustable tethering of model lipid membrane phases. The SAMs consist of fully deuterated aliphatic anchors, HS(CH2)15CONH(CH2CH2O)6CH2CONH-X, where X is either -(CD2)7CD3 or -(CD2)15CD3, dispersed in a stable matrix of protein-repellent molecules, HS(CH2)15CONHCH2CH2OH. The mixed SAMs with variable surface densities of the anchors are thoroughly characterized before and after adsorption of phospholipids by means of ellipsometry, contact angle goniometry, and infrared reflection-absorption spectroscopy (IRRAS)...
August 7, 2018: Journal of Physical Chemistry. B
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