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https://www.readbyqxmd.com/read/29457870/effect-of-the-flow-profile-on-separation-efficiency-in-pressure-assisted-reversed-polarity-capillary-zone-electrophoresis-of-anions-simulation-and-experimental-evaluation
#1
Gabor Jarvas, Marton Szigeti, Andras Guttman
Capillary electrophoresis connected to electrospray ionization mass spectrometry is a promising combination to analyze complex biological samples. The use of sheathless electrospray ionization interfaces, such as a porous nanoelectrospray capillary emitter, requires the application of forward flow (either by pressure or electroosmosis) to maintain the electrospray process. The analysis of solute molecules with strong negative charges (e.g., aminopyrenetrisulfonate labeled glycans) necessitates a reversed-polarity capillary electrophoresis separation mode, in which case the electroosmotic flow is counter current, thus pressure assistance is necessary...
February 19, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29457246/randomized-controlled-prospective-clinical-trial-of-autologous-greater-omentum-free-graft-versus-autogenous-cancellous-bone-graft-in-radial-and-ulnar-fractures-in-miniature-breed-dogs
#2
Jennifer J Ree, Wendy I Baltzer, Sarah Nemanic
OBJECTIVE: To determine the rate of radiographic healing, complications, vascularization, and bone density after repair of radial and ulnar fractures in dogs <6 kg that were treated with an autogenous cancellous bone graft (BG) or free autologous omentum graft (OG). STUDY DESIGN: Prospective, randomized, controlled clinical trial with owners/radiologists blinded to treatment. ANIMALS: 25 dogs with naturally occurring traumatic radial/ulnar fractures...
February 19, 2018: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/29457135/oceanic-crustal-carbon-cycle-drives-26-million-year-atmospheric-carbon-dioxide-periodicities
#3
R Dietmar Müller, Adriana Dutkiewicz
Atmospheric carbon dioxide (CO2 ) data for the last 420 million years (My) show long-term fluctuations related to supercontinent cycles as well as shorter cycles at 26 to 32 My whose origin is unknown. Periodicities of 26 to 30 My occur in diverse geological phenomena including mass extinctions, flood basalt volcanism, ocean anoxic events, deposition of massive evaporites, sequence boundaries, and orogenic events and have previously been linked to an extraterrestrial mechanism. The vast oceanic crustal carbon reservoir is an alternative potential driving force of climate fluctuations at these time scales, with hydrothermal crustal carbon uptake occurring mostly in young crust with a strong dependence on ocean bottom water temperature...
February 2018: Science Advances
https://www.readbyqxmd.com/read/29456751/cannulated-screw-versus-kirschner-wire-fixation-for-milch-ii-lateral-condyle-fractures-in-a-paediatric-sawbone-model-a-biomechanical-comparison
#4
D Franks, J Shatrov, M Symes, D G Little, T L Cheng
Purpose: Lateral condyle fractures of the humerus are common in the paediatric population, accounting for up to 20% of elbow fractures. Traditional management involves internal fixation with Kirschner (K)-wires, however, this has been associated with complications and insufficiently rigid fixation. Recently, cannulated screws have been proposed as a more stable method of fixation. While cannulated screws have been thought to allow earlier range of movement and shorten time to union, data regarding the biomechanical performance and optimal screw placement is scarce...
February 1, 2018: Journal of Children's Orthopaedics
https://www.readbyqxmd.com/read/29452908/gait-and-posture-analysis-in-patients-with-maxillary-transverse-discrepancy-before-and-after-rpe
#5
Martina Mason, Fabiola Spolaor, Annamaria Guiotto, Alberto De Stefani, Antonio Gracco, Zimi Sawacha
AIM: The purpose of this study was to evaluate the effects of the rapid palatal expansion (RPE) on posture and gait analysis in subjects with maxillary transverse discrepancies. MATERIAL AND METHODS: Forty-one patients between 6 and 12 years were divided into 3 groups: 10 control subjects (Cs), 16 patients with unilateral posterior crossbite (CbMono), 15 patients with maxillary transverse discrepancy and no crossbite (Nocb). Every subject underwent gait analysis and posturographic examination in order to evaluate the presence of balance alterations before (T0) and after (T4) RPE application...
February 13, 2018: International Orthodontics
https://www.readbyqxmd.com/read/29449001/balance-assessment-during-squatting-exercise-a-comparison-between-laboratory-grade-force-plate-and-a-commercial-low-cost-device
#6
Alessandro Mengarelli, Federica Verdini, Stefano Cardarelli, Francesco Di Nardo, Laura Burattini, Sandro Fioretti
Testing balance through squatting exercise is a central part of many rehabilitation programs and sports and plays also an important role in clinical evaluation of residual motor ability. The assessment of center of pressure (CoP) displacement and its parametrization is commonly used to describe and analyze squat movement and the laboratory-grade force plates (FP) are the gold standard for measuring balance performances from a dynamic view-point. However, the Nintendo Wii Balance Board (NWBB) has been recently proposed as an inexpensive and easily available device for measuring ground reaction force and CoP displacement in standing balance tasks...
February 5, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29447441/design-factors-of-femur-fracture-fixation-plates-made-of-shape-memory-alloy-based-on-the-taguchi-method-by-finite-element-analysis
#7
Cheolwoong Ko, Mikyung Yang, Taemin Byun, Sang-Wook Lee
This study proposed a way to design femur fracture fixation plates made of shape memory alloy based on CT (Computed Tomography) images of Korean cadaveric femurs. To this end, 3 major design factors of femur fracture fixation plates (circumference angle, thickness, and inner diameter) were selected based on the contact pressure when a femur fracture fixation plate was applied to a cylinder model using the Taguchi Method. Then the effects of the design factors were analyzed. It was shown that the design factors were statistically significant at a level of p=0...
February 15, 2018: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/29447117/on-the-high-lift-characteristics-of-a-bio-inspired-slotted-delta-wing
#8
Kaley Ann Sheppard, David Emory Rival
A bio-inspired, slotted delta wing was abstracted from a multi-vane propulsor geometry ubiquitous in nature, and analysed to investigate aerodynamic performance during acceleratory and steady-state motions. Evolutionary convergence of slotted geometries in nature suggests an aerodynamic benefit in manoeuvrability, as exemplified in the fins and wings of a broad range of extant and extinct swimmers and flyers, respectively. Through direct force measurements and stereoscopic particle image velocimetry, it was found that the abstracted, slotted geometry exhibited a region of steady-state lift and drag enhancement at angles of attack greater than 25° when compared to a reference profile based on a delta-wing plate...
February 15, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29442732/facile-one-pot-synthesis-of-flower-like-cobalt-oxide-nanostructures-on-nickel-plate-and-its-supercapacitance-properties
#9
N Kandasamy, T Venugopal, K Kannan
A flower like cobalt oxide nanostructured thin film (Co2O3) on Nickel (Ni) plate as have been successfully developed via alcoholic Seed Layer assisted chemical bath Deposition (SLD) process. Through the controlled alkaline electrolytes, the flower and paddles like Co2O3 nanoarchitectures were formed. The prepared thin film was characterized by X-ray diffraction (XRD), scanning electron microscope with energy dispersive X-ray (SEM and EDX), Atomic Force Microscope (AFM), Raman spectroscopy techniques. Electron micrograph reveals the flower and paddles like nanostructured Co2O3 thin film deposited on Ni plates...
June 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29439803/a-point-of-application-study-to-determine-the-accuracy-precision-and-reliability-of-a-low-cost-balance-plate-for-center-of-pressure-measurement
#10
Daniel J Goble, Ehran Khan, Harsimran S Baweja, Shawn M O'Connor
Changes in postural sway measured via force plate center of pressure have been associated with many aspects of human motor ability. A previous study validated the accuracy and precision of a relatively new, low-cost and portable force plate called the Balance Tracking System (BTrackS). This work compared a laboratory-grade force plate versus BTrackS during human-like dynamic sway conditions generated by an inverted pendulum device. The present study sought to extend previous validation attempts for BTrackS using a more traditional point of application (POA) approach...
February 8, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29438912/spatial-and-temporal-analysis-center-of-pressure-displacement-during-adolescence-clinical-implications-of-developmental-changes
#11
Catherine Quatman-Yates, Scott Bonnette, Resmi Gupta, Jason A Hugentobler, Shari L Wade, Tracy A Glauser, Richard F Ittenbach, Mark V Paterno, Michael A Riley
This study aimed to provide insight into the development of postural control abilities in youth. A total of 276 typically developing adolescents (155 males, 121 females) with a mean age of 13.23 years (range of 7.11-18.80) were recruited for participation. Subjects performed two-minute quiet standing trials in bipedal stance on a force plate. Center of pressure (COP) trajectories were quantified using Sample Entropy (SampEn) in the anterior-posterior direction (SampEn-AP), SampEn in the medial-lateral direction (SampEn-ML), and Path Length (PL) measures...
February 10, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29438911/biomechanical-assessment-of-dynamic-balance-specificity-of-different-balance-tests
#12
Steffen Ringhof, Thorsten Stein
Dynamic balance is vitally important for most sports and activities of daily living, so the assessment of dynamic stability has become an important issue. In consequence, a large number of balance tests have been developed. However, it is not yet known whether these tests (i) measure the same construct and (ii) can differentiate between athletes with different balance expertise. We therefore studied three common dynamic balance tests: one-leg jump landings, Posturomed perturbations and simulated forward falls...
February 10, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29437434/measurement-of-the-casimir-force-between-two-spheres
#13
Joseph L Garrett, David A T Somers, Jeremy N Munday
Complex interaction geometries offer a unique opportunity to modify the strength and sign of the Casimir force. However, measurements have traditionally been limited to sphere-plate or plate-plate configurations. Prior attempts to extend measurements to different geometries relied on either nanofabrication techniques that are limited to only a few materials or slight modifications of the sphere-plate geometry due to alignment difficulties of more intricate configurations. Here, we overcome this obstacle to present measurements of the Casimir force between two gold spheres using an atomic force microscope...
January 26, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29429723/design-a-sensitive-optical-thin-film-sensor-based-on-incorporation-of-isonicotinohydrazide-derivative-in-sol-gel-matrix-for-determination-of-trace-amounts-of-copper-ii-in-fruit-juice-effect-of-sonication-time-on-immobilization-approach
#14
Seyed Alireza Shahamirifard, Mehrorang Ghaedi, Morteza Montazerozohori
A new selective and sensitive optical sensor based on the incorporation of new synthesized N'-(2-hydroxy-5-iodobenzylidene) isonicotinohydrazide (HIBIN) as an effective reagent into the nanoporous of a transparent glass like material through the sol-gel process was developed which was suitable for the determination of copper (II) ions in aqueous solutions. The thin film sensors were constructed by spin-coating of prepared sol onto glass plate and their surface morphology were studied by field emission scanning electron microscopy (FE-SEM) and atomic force microscope (AFM) technique...
April 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29426604/damage-in-a-distal-radius-fracture-model-treated-with-locked-volar-plating-after-simulated-postoperative-loading
#15
Christina Salas, Justin A Brantley, James Clark, Mahmoud Reda Taha, Deana M Mercer, Orrin B Myers
PURPOSE: "Damage" is an engineering term defining a period between a state of material perfection and the onset of crack initiation. Clinically, it is a loss of fixation due to microstructural breakdown, indirectly measured as a reduction of stiffness of the bone-implant construct, normalized by the cross-sectional area and length of the bone. The purpose of this study was to characterize damage in a cadaver model of extra-articular distal radius fracture with dorsal comminution treated using 2-column volar distal radius plates...
February 6, 2018: Journal of Hand Surgery
https://www.readbyqxmd.com/read/29420151/altered-achilles-tendon-function-during-walking-in-people-with-diabetic-neuropathy-implications-for-metabolic-energy-saving
#16
Milos Petrovic, Constantinos N Maganaris, Kevin Deschamps, Sabine M Verschueren, Frank L Bowling, Andrew Jm Boulton, Neil D Reeves
The Achilles tendon (AT) has the capacity to store and release elastic energy during walking, contributing to metabolic energy savings. In diabetes patients, it is hypothesised that a stiffer Achilles tendon may reduce the capacity for energy saving through this mechanism, thereby contributing to an increased metabolic cost of walking (CoW). The aim of this study was to investigate the effects of diabetes and diabetic peripheral neuropathy (DPN) on the Achilles tendon and plantarflexor muscle-tendon unit behaviour during walking...
February 8, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29415564/plate-alone-versus-plate-and-lag-screw-for-lapidus-arthrodesis-a-biomechanical-comparison-of-compression
#17
Peter Kameel Garas, Steven Thomas DiSegna, Abhay R Patel
BACKGROUND: Arthrodesis of the first tarsal metatarsal joint can be accomplished in many ways. The compressive force attained between various constructs remains unclear. This study compares compression achieved through a locking/compression Lapidus plate both with and without the addition of a lag screw. METHODS: A dorsal medial Lapidus/locking compression plate (Total Compression Plate System, OrthoPro, Salt Lake City, UT, now Wright Medical) was applied to one cadaveric limb, while the same plate with the addition of a 4...
February 1, 2018: Foot & Ankle Specialist
https://www.readbyqxmd.com/read/29414721/vascular-complication-after-percutaneous-femoral-cerclage-wire
#18
M Ehlinger, L Niglis, H Favreau, S Kuntz, G Bierry, P Adam, F Bonnomet
Cerclage wire is an effective fracture fixation method. However, its mechanical benefits are countered by local ischemia. Its efficacy for treating femoral periprosthetic fractures has been demonstrated since femoral fixation is possible even there is a stem in the diaphysis. It securely holds the proximal femur typically with an additional plate. The development of minimally-invasive surgery with plate fixation has led to the cerclage wire being inserted percutaneously.Here, we report on a case of secondary femoral ischemia following percutaneous cerclage wire of a periprosthetic femoral fracture...
February 4, 2018: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/29413848/abstract-id-13-monte-carlo-simulations-for-the-beam-quality-factors-of-a-parallel-plate-ion-chamber-in-the-presence-of-magnetic-field
#19
Jaegi Lee, Sung-Joon Ye
Magnetic resonance imaging-guided radiotherapy provides real-time imaging with a superior soft-tissue contrast without radiation exposure. Recently, several groups have been developing such a new technology. Strong magnetic fields can influence trajectories of the secondary electrons by the Lorentz force. The reference dosimetry using an ion-chamber in magnetic fields needs additional correction factors [1]. In this study, we calculated magnetic field correction factors by the Monte Carlo method for the reference dosimetry using a parallel-plate ion-chamber...
January 2018: Physica Medica: PM
https://www.readbyqxmd.com/read/29413618/electrostatic-immobilization-of-antimicrobial-peptides-on-polyethylenimine-and-their-antibacterial-effect-against-staphylococcus-epidermidis
#20
J Hernandez-Montelongo, Y R Corrales Ureña, D Machado, M Lancelloti, M P Pinheiro, K Rischka, P N Lisboa-Filho, M A Cotta
Staphylococcus epidermidis is a gram-positive bacterium, and one of the most prevalent causes of nosocomial infections due to its strong ability to form biofilms on catheters and surgical implants. Here we explore the antimicrobial properties of Tet-124 peptides, which are part of the innate defense against different multicellular organisms in nature. Two different Tet-124 peptides were immobilized on a polyethylenimine (PEI) film to determine their impact on the antimicrobial properties: KLWWMIRRW (Tet-124), which contains only natural amino acids, and KLWWMIRRWG-(F-Br)-G (F-Br = 4-Bromophenylalanine), a modified Tet-124 sequence with the addition of an unnatural amino acid...
February 5, 2018: Colloids and Surfaces. B, Biointerfaces
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