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https://www.readbyqxmd.com/read/28921787/myocardial-bridging-is-associated-with-exercise-induced-ventricular-arrhythmia-and-increases-in-qt-dispersion
#1
Makiko Nishikii-Tachibana, Vedant S Pargaonkar, Ingela Schnittger, Francois Haddad, Ian S Rogers, Jennifer A Tremmel, Paul J Wang
BACKGROUND: A myocardial bridge (MB) has been associated with ventricular arrhythmia and sudden death during exercise. QT dispersion (QTd) is a measure of abnormal repolarization and may predict ventricular arrhythmia. We investigated the frequency of ventricular arrhythmias during exercise and the QTd at rest and after exercise, in patients with an MB compared to a normal cohort. METHODS: We studied the rest and stress ECG tracings of patients with an MB suspected by focal septal buckling on exercise echocardiography (EE) (Echo-MB group, N = 510), those with an MB confirmed by another examination (MB group, N = 110), and healthy controls (Control group, N = 198)...
September 18, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/28903974/ultrawide-field-imaging-and-sonography-of-a-radial-buckle
#2
Brijesh Takkar, Divya Agarwal, Hemant Kumar Joshi, Pradeep Venkatesh
No abstract text is available yet for this article.
September 13, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28903086/an-efficient-size-dependent-shear-deformable-shell-model-and-molecular-dynamics-simulation-for-axial-instability-analysis-of-silicon-nanoshells
#3
S Sahmani, M M Aghdam, M Bahrami
Understanding the size-dependent behavior of structures at nanoscale is essential in order to have an effective design of nanosystems. In the current investigation, the surface elasticity theory is extended to study the nonlinear buckling and postbuckling response of axially loaded silicon cylindrical naoshells. Thereby, an efficient size-dependent shear deformable shell model is developed including the size effect of surface free energy. A boundary layer theory of shell buckling in conjunction with a perturbation-based solution methodology is employed to predict the size dependency in the buckling loads and postbuckling behavior of silicon nanoshells having various thicknesses...
August 24, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28902722/diagnostic-approach-to-ocular-infections-using-various-techniques-from-conventional-culture-to-next-generation-sequencing-analysis
#4
Hiroshi Eguchi, Fumika Hotta, Tomomi Kuwahara, Haruyuki Imaohji, Chika Miyazaki, Miou Hirose, Shunji Kusaka, Masahiko Fukuda, Yoshikazu Shimomura
Ocular infection is caused by both endogenous (resident) and exogenous (environmental) microbes. As the ocular surface interacts with both outer environment and its own resident microbiota, clinical ocular samples are predicted to contain a diverse set of microorganisms. Microscopy of sample smears is an important step in the diagnostic process of infectious diseases to interpret the culture results. Traditional culture techniques have several limitations in the detection and/or identification of uncharacterized bacteria of environmental origin...
September 11, 2017: Cornea
https://www.readbyqxmd.com/read/28902199/tuning-the-electronic-structure-in-stanene-graphene-bilayers-using-strain-and-gas-adsorption
#5
Frank F Yun, D L Cortie, X L Wang
Epitaxial growth of stanene monolayers on graphene substrates is an attractive synthesis route for atomically-thin electronic components, however, it remains unclear how such composites will tolerate lattice strain and exposure to ambient atmosphere. Using density functional theory, we identified several epitaxial configurations for the stanene-graphene bilayer system and determined the effect of strain and water adsorption. In addition to previously reported co-aligned bilayers, we identify a second family of low energy structures involving rotation of one layer by thirty degrees...
September 13, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28898103/a-comparative-study-of-secondary-structure-and-interactions-of-the-r5-peptide-in-silicon-oxide-and-titanium-oxide-co-precipitates-using-solid-state-nmr-spectroscopy
#6
Erika L Buckle, Adrienne Roehrich, Branden Vandermoon, Gary P Drobny
A biomimetic, peptide-mediated approach to inorganic nanostructure formation is of great interest as an alternative to industrial production methods. To investigate the role of peptide structure on silica (SiO2) and titania (TiO2) morphologies, we use the R5 peptide domain derived from the silaffin protein to produce uniform SiO2 and TiO2 nanostructures from the precursor silicic acid and titanium bis(ammonium lactato)dihydroxide, respectively. The resulting biosilica and biotitania nanostructures are characterized using scanning electron microscopy...
September 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28893887/doctors-should-buckle-up-for-health-reforms-barrette
#7
Lauren Vogel
No abstract text is available yet for this article.
September 11, 2017: CMAJ: Canadian Medical Association Journal, Journal de L'Association Medicale Canadienne
https://www.readbyqxmd.com/read/28889743/prediction-of-green-phosphorus-with-tunable-direct-band-gap-and-high-mobility
#8
Woo Hyun Han, Sunghyun Kim, In-Ho Lee, Kee Joo Chang
Black phosphorus is an emerging material in nanoelectronics and nanophotonics due to its high carrier mobility and anisotropic in-plane properties. In addition, the polymorphism of phosphorus leads to numerous searches for new allotropes that are more attractive than black phosphorus in a variety of applications. On the basis of ab initio evolutionary crystal structure search computation, we report the prediction of a phosphorus allotrope called green phosphorus (λ-P), which exhibits direct band gaps ranging from 0...
September 13, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28885628/fluctuation-tension-and-shape-transition-of-vesicles-renormalisation-calculations-and-monte-carlo-simulations
#9
Guillaume Gueguen, Nicolas Destainville, Manoel Manghi
It has been known for long that the fluctuation surface tension of membranes r, computed from the height fluctuation spectrum, is not equal to the bare surface tension σ, which is introduced in the theory either as a Lagrange multiplier to conserve the total membrane area or as an external constraint. In this work we relate these two surface tensions both analytically and numerically. They are also compared to the Laplace tension γ, and the mechanical frame tension τ. Using the Helfrich model and one-loop renormalisation calculations, we obtain, in addition to the effective bending modulus κeff, a new expression for the effective surface tension σeff = σ - εkBT/(2ap) where kBT is the thermal energy, ap the projected cut-off area, and ε = 3 or 1 according to the allowed configurations that keep either the projected area or the total area constant...
September 8, 2017: Soft Matter
https://www.readbyqxmd.com/read/28885187/a-review-on-mechanical-considerations-for-chronically-implanted-neural-probes
#10
Aziliz Lecomte, Emeline Descamps, Christian Bergaud
This review intends on presenting a comprehensive analysis of the mechanical considerations for chronically-implanted neural probes. Failure of neural electrical recordings or stimulation over time has shown to arise from foreign body reaction and device material stability. It seems that devices that match most closely the mechanical properties of the brain would more likely reduce the mechanical stress at the probe/tissue interface, thus improving body acceptance. The use of low Young's modulus polymers instead of hard substrates is a known way to enhance this mechanical mimetism, though compliance can be achieved through a variety of means...
September 8, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28878567/adaptive-compliant-structures-for-flow-regulation
#11
Gaetano Arena, Rainer M J Groh, Alex Brinkmeyer, Raf Theunissen, Paul M Weaver, Alberto Pirrera
This paper introduces conceptual design principles for a novel class of adaptive structures that provide both flow regulation and control. While of general applicability, these design principles, which revolve around the idea of using the instabilities and elastically nonlinear behaviour of post-buckled panels, are exemplified through a case study: the design of a shape-adaptive air inlet. The inlet comprises a deformable post-buckled member that changes shape depending on the pressure field applied by the surrounding fluid, thereby regulating the inlet aperture...
August 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28877490/adaptive-response-of-actin-bundles-under-mechanical-stress
#12
Florian Rückerl, Martin Lenz, Timo Betz, John Manzi, Jean-Louis Martiel, Mahassine Safouane, Rajaa Paterski-Boujemaa, Laurent Blanchoin, Cécile Sykes
Actin is one of the main components of the architecture of cells. Actin filaments form different polymer networks with versatile mechanical properties that depend on their spatial organization and the presence of cross-linkers. Here, we investigate the mechanical properties of actin bundles in the absence of cross-linkers. Bundles are polymerized from the surface of mDia1-coated latex beads, and deformed by manipulating both ends through attached beads held by optical tweezers, allowing us to record the applied force...
September 5, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28875063/organo-selenium-coatings-inhibit-gram-negative-and-gram-positive-bacterial-attachment-to-ophthalmic-scleral-buckle-material
#13
Phat Tran, Avery Arnett, Courtney Jarvis, Thomas Mosley, Khien Tran, Rob Hanes, Dan Webster, Kelly Mitchell, Leo Dominguez, Abdul Hamood, Ted W Reid
PURPOSE: Biofilm formation is a problem for solid and sponge-type scleral buckles. This can lead to complications that require removal of the buckle, and result in vision loss due to related ocular morbidity, primarily infection, or recurrent retinal detachment. We investigate the ability of a covalent organo-selenium coating to inhibit biofilm formation on a scleral buckle. METHODS: Sponge and solid Labtican brand scleral buckles were coated with organo-selenium coupled to a silyation reagent...
September 2017: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/28872623/compression-fracture-of-cfrp-laminates-containing-stress-intensifications
#14
Christian Leopold, Martin Schütt, Wilfried V Liebig, Timo Philipkowski, Jonas Kürten, Karl Schulte, Bodo Fiedler
For brittle fracture behaviour of carbon fibre reinforced plastics (CFRP) under compression, several approaches exist, which describe different mechanisms during failure, especially at stress intensifications. The failure process is not only initiated by the buckling fibres, but a shear driven fibre compressive failure beneficiaries or initiates the formation of fibres into a kink-band. Starting from this kink-band further damage can be detected, which leads to the final failure. The subject of this work is an experimental investigation on the influence of ply thickness and stacking sequence in quasi-isotropic CFRP laminates containing stress intensifications under compression loading...
September 5, 2017: Materials
https://www.readbyqxmd.com/read/28865708/computational-stability-of-human-knee-joint-at-early-stance-in-gait-effects-of-muscle-coactivity-and-anterior-cruciate-ligament-deficiency
#15
M Sharifi, A Shirazi-Adl, H Marouane
As one of the most complex and vulnerable structures of body, the human knee joint should maintain dynamic equilibrium and stability in occupational and recreational activities. The evaluation of its stability and factors affecting it is vital in performance evaluation/enhancement, injury prevention and treatment managements. Knee stability often manifests itself by pain, hypermobility and giving-way sensations and is usually assessed by the passive joint laxity tests. Mechanical stability of both the human knee joint and the lower extremity at early stance periods of gait (0% and 5%) were quantified here for the first time using a hybrid musculoskeletal model of the lower extremity...
August 20, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28862256/rhegmatogenous-retinal-detachment-in-paediatric-patients-after-pars-plana-vitrectomy-and-sutured-scleral-fixated-intraocular-lenses
#16
P Sen, S I Shaikh, K Sreelakshmi
PurposeTo report the incidence rate, management, and surgical outcomes of rhegmatogenous retinal detachment (RRD) in children who underwent pars plana vitrectomy (PPV) with sutured scleral-fixated intraocular lens implantation (SSFIOL).Patients and methodsOf the 279 eyes of 230 children who underwent PPV with SSFIOL at a tertiary eye care centre, 16 eyes of 15 children developed RRD. Retrospective analysis of the surgical details of RRD, the structural and functional outcomes was done.ResultsOf the 279 eyes of 230 children who underwent PPV with SSFIOL, RRD was seen in 5...
September 1, 2017: Eye
https://www.readbyqxmd.com/read/28860707/widening-use-of-dexamethasone-implant-for-the-treatment-of-macular-edema
#17
REVIEW
Vincenza Bonfiglio, Michele Reibaldi, Matteo Fallico, Andrea Russo, Alessandra Pizzo, Stefano Fichera, Carlo Rapisarda, Iacopo Macchi, Teresio Avitabile, Antonio Longo
Sustained-release intravitreal 0.7 mg dexamethasone (DEX) implant is approved in Europe for the treatment of macular edema related to diabetic retinopathy, branch retinal vein occlusion, central retinal vein occlusion, and non-infectious uveitis. The implant is formulated in a biodegradable copolymer to release the active ingredient within the vitreous chamber for up to 6 months after an intravitreal injection, allowing a prolonged interval of efficacy between injections with a good safety profile. Various other ocular pathologies with inflammatory etiopathogeneses associated with macular edema have been treated by DEX implant, including neovascular age-related macular degeneration, Irvine-Gass syndrome, vasoproliferative retinal tumors, retinal telangiectasia, Coats' disease, radiation maculopathy, retinitis pigmentosa, and macular edema secondary to scleral buckling and pars plana vitrectomy...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28853021/first-principles-study-on-the-stability-and-stm-image-of-borophene
#18
Zhifen Luo, Xiaoli Fan, Yurong An
Very recently, borophene (atomic-thin two-dimensional boron sheet) has been successfully synthesized on the Ag(111) surface by deposition. Two kinds of structures were found. However, the identification of the monolayer boron sheets grown on the metal substrate, as well as the stability of different 2D boron sheets, is controversial. By performing the first-principles calculations, present study investigates the atomic structure, stability, and electronic properties of the most possible boron sheets grown on metal surface, namely, buckled triangular, β12, and χ3 types of crystal lattice...
August 29, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28844322/incidence-risk-factors-and-outcomes-of-retinal-detachment-after-pediatric-cataract-surgery
#19
Sumita Agarkar, Varada Vinay Gokhale, Rajiv Raman, Muna Bhende, Gayathri Swaminathan, Mukesh Jain
PURPOSE: To report the incidence of, and to estimate the long-term risk and predisposing factors and the surgical outcomes for, retinal detachment (RD) after pediatric cataract surgery. DESIGN: Retrospective consecutive interventional case series. PARTICIPANTS: During the study period 1996 to 2007 at a tertiary eye care institute, 481 eyes of 295 children aged below 16 years with no other ocular and systemic anomalies who underwent lensectomy, posterior capsulorrhexis, and anterior vitrectomy combined with primary intraocular lens implantation were included...
August 22, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28843975/buckled-thyroid-cartilage-an-anatomic-variant
#20
Brent A Chang, Kimberly Luu, Ethan K Newton, Murray D Morrison
OBJECTIVE: Anatomic abnormalities in the larynx can cause significant and bothersome symptoms. Identified here is an anatomical variant of the thyroid cartilage. STUDY DESIGN: This study is a retrospective case series of 11 subjects diagnosed with an anatomic variant of the thyroid cartilage. METHODS: Patients with an anatomic inward buckling of the thyroid cartilage, termed here as buckled thyroid cartilage, were identified through a 20-year retrospective chart review of a tertiary care laryngology practice...
August 23, 2017: Journal of Voice: Official Journal of the Voice Foundation
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