keyword
MENU ▼
Read by QxMD icon Read
search

buckle

keyword
https://www.readbyqxmd.com/read/29144829/complications-assoicated-with-miragel-for-treatment-of-retinal-detachment
#1
Miin Roh, Nahyoung Grace Lee, John B Miller
MIRAgel (MIRA, Waltham, MA) is a hydrogel buckle that was introduced in 1979 as a new scleral implant for the treatment of retinal detachment. Long-term follow-up of more than 10 years revealed that the hydrolysis of the synthetic hydrophilic material leads to marked expansion of the substance, causing complications such as buckle extrusion and intrusion, eye motility disorder, cosmetic deformities, and periocular infections. Removal of the implant is the treatment of choice in cases with complications, but it is technically difficult due to the friability of the implant, severe scleral ectasia, and relatively high rate of redetachment after removal...
November 16, 2017: Seminars in Ophthalmology
https://www.readbyqxmd.com/read/29143842/wrinkling-formation-in-simply-supported-graphenes-under-tension-and-compression-loadings
#2
Ch Androulidakis, E N Koukaras, M G Pastore Carbone, M Hadjinicolaou, C Galiotis
Wrinkles in supported graphenes can be formed either by uniaxial compression or uniaxial tension beyond a certain critical load depending on the mode of loading. In the first case, the wrinkling direction is normal to the compression axis whereas in tension, wrinkles of the same pattern are formed parallel to the loading direction due to Poisson's (lateral) contraction. Herein we show by direct AFM observations that in simply-supported graphenes such instabilities appear as periodic wrinkles over existing stochastic undulations caused by the underlying-substrate-roughness...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29141043/lateral-migration-of-electrospun-hydrogel-nanofilaments-in-an-oscillatory-flow
#3
Sylwia Pawłowska, Paweł Nakielski, Filippo Pierini, Izabela K Piechocka, Krzysztof Zembrzycki, Tomasz A Kowalewski
The recent progress in bioengineering has created great interest in the dynamics and manipulation of long, deformable macromolecules interacting with fluid flow. We report experimental data on the cross-flow migration, bending, and buckling of extremely deformable hydrogel nanofilaments conveyed by an oscillatory flow into a microchannel. The changes in migration velocity and filament orientation are related to the flow velocity and the filament's initial position, deformation, and length. The observed migration dynamics of hydrogel filaments qualitatively confirms the validity of the previously developed worm-like bead-chain hydrodynamic model...
2017: PloS One
https://www.readbyqxmd.com/read/29138449/haemodynamic-recovery-properties-of-the-torsioned-testicular-artery-lumen
#4
Selda Goktas, Ozlem Yalcin, Erhan Ermek, Senol Piskin, Can T Capraz, Yusuf O Cakmak, Kerem Pekkan
Testicular artery torsion (twisting) is one such severe vascular condition that leads spermatic cord injury. In this study, we investigate the recovery response of a torsioned ram testicular artery in an isolated organ-culture flow loop with clinically relevant twisting modes (90°, 180°, 270° and 360° angles). Quantitative optical coherence tomography technique was employed to track changes in the lumen diameter, wall thickness and the three-dimensional shape of the vessel in the physiological pressure range (10-50 mmHg)...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29136578/deformation-mechanisms-of-prototype-composite-braided-stent-grafts-in-bending-fatigue-for-peripheral-artery-application
#5
Wen Xue, Jing Gao, Jing Lin, Fujun Wang, Guoping Guan, Lu Wang
Stent-grafts in peripheral arteries suffer from complex cyclic loadings in vivo, including pulsatile, axial bending and torsion. Normal fatigue durability evaluation technologies, however, are majorly based on pulsation and thus are short of accuracy under the complicated stress conditions experienced physiologically. While there is a little research focused on the cyclic fatigue of stent-grafts in bending, it remains an almost total lack of deformation or fatigue mechanisms. In this work, composite braided stent-grafts incorporating Nitinol (NiTi) yarns and polyethylene terephthalate (PET) multifilament yarns were cycled in bending by the self-developed testing system to investigate their deformation behaviors...
October 31, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29134994/gas-adsorption-efficacy-of-graphene-sheets-functionalised-with-carboxyl-hydroxyl-and-epoxy-groups-in-conjunction-with-stone-thrower-wales-stw-and-inverse-stone-thrower-wales-istw-defects
#6
Murugan Lalitha, Senthilkumar Lakshmipathi
The complete reduction of graphene oxide is difficult to achieve, and hence oxygen-containing functional groups do exist in graphene, along with structural defects. On the other hand, efficient gas sensor materials have been a subject of relentless interest. This instigates the need to explore the gas adsorption on STW and ISTW defective graphene sheets functionalised by -COOH, -OH and C-O-C groups, using density functional theory calculations. Both defects are experimentally feasible as evident through their formation energies...
November 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29134104/king-post-truss-as-a-motif-for-internal-structure-of-meta-material-with-controlled-elastic-properties
#7
Emilio Turco, Ivan Giorgio, Anil Misra, Francesco dell'Isola
One of the most interesting challenges in the modern theory of materials consists in the determination of those microstructures which produce, at the macro-level, a class of metamaterials whose elastic range is many orders of magnitude wider than the one exhibited by 'standard' materials. In dell'Isola et al. (2015 Zeitschrift für angewandte Mathematik und Physik66, 3473-3498. (doi:10.1007/s00033-015-0556-4)), it was proved that, with a pantographic microstructure constituted by 'long' micro-beams it is possible to obtain metamaterials whose elastic range spans up to an elongation exceeding 30%...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29133665/a-rare-case-of-bilateral-tractional-retinal-detachment-following-snakebite
#8
Nicey Roy Thomas, Debmalya Das, Kumar Saurabh, Rupak Roy
A 13-year-old female presented with diminution of vision in both eyes for 3 months following snakebite. Best-corrected visual acuities were hand movement in both eyes. Fundoscopy showed vitreous hemorrhage, and B-scan ultrasonography revealed an underlying tractional retinal detachment (TRD) involving the macula in both eyes. Patient underwent 25-gauge pars plana vitrectomy in conjunction with belt buckling, endolaser, and silicone oil tamponade in the left eye. At 6 weeks postoperatively, best-corrected visual acuity of the left eye was noted to be 20/200 with settled TRD and attached retina...
November 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29133656/an-unusual-intraocular-foreign-body-intravitreal-cilium-following-scleral-buckling-for-retinal-detachment-repair
#9
Sundaram Natarajan, Chinmay Nakhwa, Aylette Jude D Silva
No abstract text is available yet for this article.
November 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29125779/outcomes-of-recurrent-retinal-detachment-surgery-following-pars-plana-vitrectomy-for-rhegmatogenous-retinal-detachment
#10
Vikas Ambiya, Padmaja Kumari Rani, Raja Narayanan, Divya Balakrishnan, Jay Chhablani, Subhadra Jalali, Mudit Tyagi, Rajeev Reddy Pappuru
AIM: To study the anatomical and functional outcomes of recurrent retinal detachment (RD) surgery following pars plana vitrectomy (PPV) for rhegmatogenous retinal detachment. METHODS: Retrospective analysis of 133 consecutive cases of recurrent RD. INCLUSION CRITERIA: age ≥18 years, recurrent RD following PPV ± encircling band for rhegmatogenous RD. EXCLUSION CRITERIA: age <18 years, post-endophthalmitis/tractional/exudative/combined RD, post-scleral buckle, primary surgery done at another institute...
November 10, 2017: Seminars in Ophthalmology
https://www.readbyqxmd.com/read/29123094/human-sperm-steer-with-second-harmonics-of-the-flagellar-beat
#11
Guglielmo Saggiorato, Luis Alvarez, Jan F Jikeli, U Benjamin Kaupp, Gerhard Gompper, Jens Elgeti
Sperm are propelled by bending waves traveling along their flagellum. For steering in gradients of sensory cues, sperm adjust the flagellar waveform. Symmetric and asymmetric waveforms result in straight and curved swimming paths, respectively. Two mechanisms causing spatially asymmetric waveforms have been proposed: an average flagellar curvature and buckling. We image flagella of human sperm tethered with the head to a surface. The waveform is characterized by a fundamental beat frequency and its second harmonic...
November 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/29121357/comparison-of-pneumatic-retinopexy-and-scleral-buckle-for-primary-rhegmatogenous-retinal-detachment-repair
#12
Yannis M Paulus, Loh-Shan Leung, Svetlana Pilyugina, Mark S Blumenkranz
BACKGROUND AND OBJECTIVE: To compare pneumatic retinopexy (PR) and scleral buckle for the repair of primary rhegmatogenous retinal detachment. PATIENTS AND METHODS: Retrospective analysis of 90 patients undergoing surgery for primary rhegmatogenous retinal detachment, with 46 patients undergoing PR compared with 44 patients undergoing scleral buckle procedure (SBP). RESULTS: Both groups had similar baseline characteristics. Single surgery reattachment rate was 95...
November 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/29120734/laboratory-evolution-of-protein-conformational-dynamics
#13
REVIEW
Eleanor C Campbell, Galen J Correy, Peter D Mabbitt, Ashley M Buckle, Nobuhiko Tokiriki, Colin J Jackson
This review focuses on recent work that has begun to establish specific functional roles for protein conformational dynamics, specifically how the conformational landscapes that proteins can sample can evolve under laboratory based evolutionary selection. We discuss recent technical advances in computational and biophysical chemistry, which have provided us with new ways to dissect evolutionary processes. Finally, we offer some perspectives on the emerging view of conformational dynamics and evolution, and the challenges that we face in rationally engineering conformational dynamics...
November 7, 2017: Current Opinion in Structural Biology
https://www.readbyqxmd.com/read/29119143/modified-controlled-encircling-scleral-buckle-for-retinal-detachment
#14
Dimitra Skondra, Corey Westerfeld, Demetrios G Vavvas
During encircling scleral buckle placement, the ends of the element are tightened to achieve a shortened radius of the eye. The determining factor of the final buckle height is subjective using usually a combination of the buckle height visualized with the degree of scleral indentation and can be difficult to be taught early on to trainees. Here, we describe a case series in which a modified controlled encircling scleral buckle technique that simplifies and standardizes the achievement of reproducible buckle height of about a 1 mm is objective and easy to be taught...
September 2017: J Vitreoretin Dis
https://www.readbyqxmd.com/read/29118662/indentation-of-a-floating-elastic-sheet-geometry-versus-applied-tension
#15
Finn Box, Dominic Vella, Robert W Style, Jerome A Neufeld
The localized loading of an elastic sheet floating on a liquid bath occurs at scales from a frog sitting on a lily pad to a volcano supported by the Earth's tectonic plates. The load is supported by a combination of the stresses within the sheet (which may include applied tensions from, for example, surface tension) and the hydrostatic pressure in the liquid. At the same time, the sheet deforms, and may wrinkle, because of the load. We study this problem in terms of the (relatively weak) applied tension and the indentation depth...
October 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/29118490/corneal-epithelial-defect-after-pars-plana-vitrectomy
#16
Ahmed Sulaiman Al-Hinai
AIM: This study aims to study the incidence of corneal epithelial defect (CED) after pars plana vitrectomy (PPV) and associated patient-related risk factors. The incidence of other immediate postoperative complications was also in the scope of this study. DESIGN: Retrospective descriptive case series study. METHODS: Review of electronic medical records of all patients who underwent PPV alone or combined with cataract surgery and/or scleral buckle in a tertiary hospital by one retinal surgeon...
September 2017: Oman Journal of Ophthalmology
https://www.readbyqxmd.com/read/29115284/double-edged-effect-of-electric-field-on-the-mechanical-property-of-water-filled-carbon-nanotubes-with-an-application-to-nanoscale-trigger
#17
Hongfei Ye, Yonggang Zheng, Lili Zhou, Junfei Zhao, Hong Wu Zhang, Zhen Chen
Polar water molecules would exhibit extraordinary phenomena under nanoscale confinement. By means of electric field, the water-filled carbon nanotube (CNT) that has been successfully fabricated in laboratory is expected to make distinct responses to the external electricity. Here, we examine the effect of electric field direction on the mechanical property of water-filled CNTs. It is found that the longitudinal electric field enhances but the transversal electric field reduces the elastic modulus and critical buckling stress of water-filled CNTs...
November 8, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29112850/mechanochemical-polarization-of-contiguous-cell-walls-shapes-plant-pavement-cells
#18
Mateusz Majda, Peter Grones, Ida-Maria Sintorn, Thomas Vain, Pascale Milani, Pawel Krupinski, Beata Zagórska-Marek, Corrado Viotti, Henrik Jönsson, Ewa J Mellerowicz, Olivier Hamant, Stéphanie Robert
The epidermis of aerial plant organs is thought to be limiting for growth, because it acts as a continuous load-bearing layer, resisting tension. Leaf epidermis contains jigsaw puzzle piece-shaped pavement cells whose shape has been proposed to be a result of subcellular variations in expansion rate that induce local buckling events. Paradoxically, such local compressive buckling should not occur given the tensile stresses across the epidermis. Using computational modeling, we show that the simplest scenario to explain pavement cell shapes within an epidermis under tension must involve mechanical wall heterogeneities across and along the anticlinal pavement cell walls between adjacent cells...
November 6, 2017: Developmental Cell
https://www.readbyqxmd.com/read/29111556/mechano-responsive-lateral-buckling-of-miniaturized-beams-standing-on-flexible-substrates
#19
Hyemin Lee, Jung Gun Bae, Won Bo Lee, Hyunsik Yoon
We fabricate an elastomeric beam standing on a flexible substrate using 3D printing and soft lithography and investigate lateral buckling generated in the part of the wall when this beam is under pure bending. We also observe changes in the morphology of wrinkling along the applied strain and geometry of the wall, and then analyze it with scaling concepts. Furthermore, the degree of lateral buckling is controlled through the tip design in the ratchet structure and it is verified with finite element simulation...
November 7, 2017: Soft Matter
https://www.readbyqxmd.com/read/29108883/an-elisa-method-to-estimate-the-mono-adp-ribosyltransferase-activities-e-g-in-pertussis-toxin-and-vaccines
#20
Catpagavalli Asokanathan, Sharon Tierney, Christina R Ball, George Buckle, Ami Day, Simon Tanley, Adrian Bristow, Kevin Markey, Dorothy Xing, Chun-Ting Yuen
ADP-ribosyltransferase activities have been observed in many prokaryotic and eukaryotic species and viruses and are involved in many cellular processes, including cell signalling, DNA repair, gene regulation and apoptosis. In a number of bacterial toxins, mono ADP-ribosyltransferase is the main cause of host cell cytotoxicity. Several approaches have been used to analyse this biological system from measuring its enzyme products to its functions. By using a mono ADP-ribose binding protein we have now developed an ELISA method to estimate native pertussis toxin mono ADP-ribosyltransferase activity and its residual activities in pertussis vaccines as an example...
November 8, 2017: Analytical Biochemistry
keyword
keyword
71182
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"