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https://www.readbyqxmd.com/read/28718892/methoxetamine-affects-brain-processing-involved-in-emotional-response-in-rats
#1
M T Zanda, P Fadda, S Antinori, M di Chio, W Fratta, C Chiamulera, L Fattore
BACKGROUND AND PURPOSE: Methoxetamine (MXE) is a novel psychoactive substance that is emerging on the Internet and induces dissociative effects and acute toxicity. Yet, its pharmacological effects are still poorly investigated. EXPERIMENTAL APPROACH: We examined a range of behavioural effects induced by acute intraperitoneal administration of MXE (0.5-5 mg/kg) in rats, and whether it causes rapid neuroadaptive molecular changes. KEY RESULTS: MXE (0...
July 18, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28716535/variable-compensation-during-the-sit-to-stand-task-among-individuals-with-severe-knee-osteoarthritis
#2
Yoshimasa Sagawa, Alice Bonnefoy-Mazure, Stéphane Armand, Anne Lubbeke, Pierre Hoffmeyer, Domizio Suva, Katia Turcot
BACKGROUND: Individuals with knee osteoarthritis (OA) show variability during the sit-to-stand (STS) task, so they may not perform the STS in the same way. This study aimed to determine whether individuals with knee OA have different strategies in performing the STS. METHODS: Participants with knee OA and able-bodied individuals underwent STS evaluation at a self-selected pace with use of a motion measurement system consisting of 12 cameras and 2 force plates. RESULTS: In total, 101 participants (57 women) with knee OA showed 3 main STS strategies...
July 14, 2017: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28714837/validating-center-of-pressure-balance-measurements-using-the-matscan%C3%A2-pressure-mat
#3
John Goetschius, Mark A Feger, Jay Hertel, Joseph M Hart
CONTEXT: Measurements of center of pressure (COP) excursions during balance are common practice in clinical and research settings to evaluate adaptations in postural control due to pathological or environmental conditions. Traditionally measured using laboratory force-plates, pressure-mat devices may be a suitable option for clinicians and scientist to measure COP excursions. OBJECTIVE: Compare COP measures and changes during balance between MatScan® pressure-mat and force-plate...
July 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28714826/effects-of-peroneal-muscles-fatigue-on-dynamic-stability-following-lateral-hop-landing-time-to-stabilization-vs-dynamic-postural-stability-index
#4
Kazem Malmir, Gholam Reza Olyaei, Saeed Talebian, Ali Ashraf Jamshidi, Majid Ashraf Ganguie
CONTEXT: Dynamic stability is a necessary requirement in many sports competitions. Muscle fatigue, which can impair stability, may be occurred in many sports competitions in which lateral movements and landing repeated frequently. OBJECTIVE: To assess the effects of peroneal muscles fatigue on dynamic stability following lateral hop landing through measuring time to stabilization (TTS) and dynamic postural stability index (DPSI). DESIGN: Quasi-experimental...
July 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28713451/words-that-move-us-the-effects-of-sentences-on-body-sway
#5
John F Stins, Fernando Marmolejo-Ramos, Femke Hulzinga, Eric Wenker, Rouwen Cañal-Bruland
According to the embodied cognition perspective, cognitive systems and perceptuo-motor systems are deeply intertwined and exert a causal effect on each other. A prediction following from this idea is that cognitive activity can result in subtle changes in observable movement. In one experiment, we tested whether reading various sentences resulted in changes in postural sway. Sentences symbolized various human activities involving high, low, or no physical effort. Dutch participants stood upright on a force plate, measuring the body center of pressure, while reading a succession of sentences...
2017: Advances in Cognitive Psychology
https://www.readbyqxmd.com/read/28713254/short-term-effects-of-thoracic-spine-manipulation-on-the-biomechanical-organisation-of-gait-initiation-a-randomized-pilot-study
#6
Sébastien Ditcharles, Eric Yiou, Arnaud Delafontaine, Alain Hamaoui
Speed performance during gait initiation is known to be dependent on the capacity of the central nervous system to generate efficient anticipatory postural adjustments (APA). According to the posturo-kinetic capacity (PKC) concept, any factor enhancing postural chain mobility and especially spine mobility, may facilitate the development of APA and thus speed performance. "Spinal Manipulative Therapy High-Velocity, Low-Amplitude" (SMT-HVLA) is a healing technique applied to the spine which is routinely used by healthcare practitioners to improve spine mobility...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28709228/direct-numerical-simulation-of-an-arbitrarily-shaped-particle-at-a-fluidic-interface
#7
Gregory Lecrivain, Ryoichi Yamamoto, Uwe Hampel, Takashi Taniguchi
A consistent formulation is presented for the direct numerical simulation of an arbitrarily shaped colloidal particle at a deformable fluidic interface. The rigid colloidal particle is decomposed into a collection of solid spherical beads and the three-phase boundaries are replaced with smoothly spreading interfaces. The major merit of the present formulation lies in the ease with which the geometrical decomposition of the colloidal particle is implemented, yet allows the dynamic simulation of intricate three-dimensional colloidal shapes in a binary fluid...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28709227/broadband-cloaking-of-flexural-waves
#8
Ahmad Zareei, Mohammad-Reza Alam
The governing equation for elastic waves in flexural plates is not form invariant, and hence designing a cloak for such waves faces a major challenge. Here, we present the design of a perfect broadband cloak for flexural waves through the use of a nonlinear transformation in the region of the cloak and by matching term by term the original and transformed equations and also assuming a prestressed material with body forces. For a readily achievable flexural cloak in a physical setting, we further present an approximate adoption of our perfect cloak under more restrictive physical constraints...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28705486/the-influence-of-adipose-tissue-location-on-postural-control
#9
Joanna Cieślińska-Świder, Mariusz Paweł Furmanek, Janusz Wiesław Błaszczyk
A growing body of evidence suggests, that excessive body weight is inseparably connected with postural instability. In none of previous studies, body weight distribution has been considered as a factor, which may affect results of a static posturography. The purpose of the present study is to quantify some center of foot pressure (COP) characteristics in 40 obese women with android type of obesity (waist-to-hip ratio - WHR≥0.85, BMI: 37.5±5.4) and 40 obese women with gynoid type of obesity (WHR<0.85, BMI: 36...
June 27, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28704683/visual-targeting-one-step-before-force-plates-has-no-effect-on-gait-parameters-in-orthopaedic-patients-during-level-walking
#10
Katrin Bracht-Schweizer, Marie Freslier, Sebastian Krapf, Jacqueline Romkes
In clinical gait analysis, it is challenging to acquire usable force plate data for a patient in a limited amount of time. The aim of this study was to compare three measurement protocols, to investigate if any one of them was more time-efficient than the others at collecting kinetic data. Three conditions were compared for 15 orthopaedic patients: 1) approaching the force plate with four steps, 2) approaching the force plate with six steps, and 3) approaching the force plate with four steps while stepping on a target one step before the first force plate...
July 8, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28699183/how-bacterial-cell-division-might-cheat-turgor-pressure-a-unified-mechanism-of-septal-division-in-gram-positive-and-gram-negative-bacteria
#11
REVIEW
Harold P Erickson
An important question for bacterial cell division is how the invaginating septum can overcome the turgor force generated by the high osmolarity of the cytoplasm. I suggest that it may not need to. Several studies in Gram-negative bacteria have shown that the periplasm is isoosmolar with the cytoplasm. Indirect evidence suggests that this is also true for Gram-positive bacteria. In this case the invagination of the septum takes place within the uniformly high osmotic pressure environment, and does not have to fight turgor pressure...
July 12, 2017: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
https://www.readbyqxmd.com/read/28696476/on-the-origin-of-the-driving-force-in-the-marangoni-propelled-gas-bubble-trapping-mechanism
#12
A Miniewicz, C Quintard, H Orlikowska, S Bartkiewicz
Gas bubbles can be trapped and then manipulated with laser light. In this report, we propose the detailed optical trapping mechanism of gas bubbles confined inside a thin light-absorbing liquid layer between two glass plates. The necessary condition of bubble trapping in this case is the direct absorption of light by the solution containing a dye. Due to heat release, fluid whirls propelled by the surface Marangoni effect at the liquid/gas interface emerge and extend to large distances. We report the experimental microscopic observation of the origin of whirls at an initially flat liquid/air interface as well as at the curved interface of a liquid/gas bubble and support this finding with advanced numerical simulations using the finite element method within the COMSOL Multiphysics platform...
July 11, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28692854/laser-induced-ultrasonic-waveform-derivation-and-transition-from-a-point-to-a-homogeneous-illumination-of-a-plate
#13
Jernej Laloš, Matija Jezeršek, Rok Petkovšek, Tomaž Požar
Ultrasound modeling, being an established practice, is used to study the fundamentals of light-matter interactions. Although much has been published on the matter, pressure and thermal expansion induction mechanisms in laser ultrasonics have rarely been combined, as they should, in a single ultrasonic source while the effects of its size variation have only been shown to a limited extent. In the paper, we unite these light-matter interaction mechanisms, with inclusion of lateral optical forces, into a single laser-stimulated source as it is observed in nature...
June 20, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28686901/noncalssical-multiscale-modeling-of-ssdna-manipulation-using-a-cnt-nanocarrier-based-on-afm
#14
M H Korayem, M Estaji, A Homayooni
Nanocarriers are useful tools in biological and medical research fields. In nanomanipulation, a nondestructive and successful process can be achieved by using nanocarriers. In this paper, a nonclassical multiscale approach has been presented for modeling a single strand DNA (ssDNA) manipulation based on AFM. To achieve a nondestructive nanomanipulation process, carbon nanotube (CNT) has been used as a nanocarrier. AFM setup has been separated into a Micro field (MF) and a Nano field (NF). The governing equations of the MF have been derived based on Kirchhoff plate model and a modified couple stress theory...
June 24, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28685862/sprint-mechanics-evaluation-using-inertial-sensor-based-technology-a-laboratory-validation-study
#15
Igor Setuain, Pablo Lecumberri, Juha P Ahtiainen, Antti A Mero, Keijo Häkkinen, Mikel Izquierdo
Advances in micro-electromechanical systems have turned magnetic inertial measurement units (MIMUs) into a suitable tool for vertical jumping biomechanical evaluation. Thus, the presented study aimed to determine if appropriate reliability and agreement reports could also be obtained when analysing 20m sprint mechanics. Four bouts of 20 m sprints were evaluated to determine if the data provided by a MIMU placed at the lumbar spine could reliably assess sprint mechanics and to examine the validity of the MIMU sensor compared to force plate recordings...
July 7, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28684196/force-transmission-through-the-wrist-during-performance-of-push-ups-on-a-hyperextended-and-a-neutral-wrist
#16
Olga Polovinets, Alon Wolf, Ronit Wollstein
STUDY DESIGN: Cross-sectional cohort. INTRODUCTION: Push-ups are used ubiquitously to evaluate and strengthen the upper body. They are usually performed in 1 of 2 main ways: with the wrist in hyperextension and with the wrist in a neutral position. PURPOSE OF THE STUDY: The purpose of our study was to compare the dynamic forces in the wrist during the 2 push-up styles. METHODS: Fourteen volunteers performed push-ups in 2 different patterns: on a hyperextended wrist and a neutral wrist (NW)...
July 3, 2017: Journal of Hand Therapy: Official Journal of the American Society of Hand Therapists
https://www.readbyqxmd.com/read/28682860/a-biomechanical-analysis-of-plate-fixation-using-unicortical-and-bicortical-screws-in-transverse-metacarpal-fracture-models-subjected-to-4-point-bending-and-dynamical-bending-test
#17
Eirini Liodaki, Robert Wendlandt, Klaus Waizner, Brigitte E Schopp, Peter Mailänder, Felix Stang
In the published literature there are controversial data to the biomechanical stability of monocortical comparing to the bicortical fixation of metacarpal fractures. The aim of this study was to compare the biomechanical stability of monocortical and bicortical locking osteosynthesis in quasi-static and dynamic 4-point bending tests of composite third metacarpal bone (4th Gen third metacarpal, Sawbones, Malmö, Sweden) fixed with 7-hole locking plate (XXS System, Biotech-Ortho, Wright, Memphis, TN). The tests to determine quasi-static yield and bending strength as well as fatigue strength were conducted in 4 groups of 10 samples after creating standardized mid-shaft transverse osteotomies using a diamont belt grinder (0...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28682337/episodic-kinematics-in-continental-rifts-modulated-by-changes-in-mantle-melt-fraction
#18
Simon Lamb, James D P Moore, Euan Smith, Tim Stern
Oceanic crust is created by the extraction of molten rock from underlying mantle at the seafloor 'spreading centres' found between diverging tectonic plates. Modelling studies have suggested that mantle melting can occur through decompression as the mantle flows upwards beneath spreading centres, but direct observation of this process is difficult beneath the oceans. Continental rifts, however-which are also associated with mantle melt production-are amenable to detailed measurements of their short-term kinematics using geodetic techniques...
July 5, 2017: Nature
https://www.readbyqxmd.com/read/28680006/vertebral-fracture-at-the-caudal-end-of-a-surgical-fusion-for-thoracic-vertebral-fracture-in-a-patient-with-diffuse-idiopathic-skeletal-hyperostosis-dish
#19
Hiroshi Kobayashi, Koji Otani, Kazuyuki Watanabe, Kinshi Kato, Takuya Nikaido, Shoji Yabuki, Shin-Ichi Kikuchi, Shin-Ichi Konno
The patient was an 86-year-old woman with back pain after a fall. She had no neurological findings at the initial visit. Plain radiographs and magnetic resonance imaging (MRI) showed diffuse idiopathic skeletal hyperostosis (DISH) and a Th10 fracture. Two weeks later, she started gait exercise with immobilization by a rigid orthosis. Twenty-five days later, she presented with paralysis and numbness of her legs. Computed tomography (CT) showed anterior expansion in the vertebral body of Th10. MRI showed an intramedullary high-intensity area on T2-weighted images at the same level...
July 5, 2017: Fukushima Journal of Medical Science
https://www.readbyqxmd.com/read/28679264/vibroacoustic-response-of-panels-under-diffuse-acoustic-field-excitation-from-sensitivity-functions-and-reciprocity-principles
#20
Christophe Marchetto, Laurent Maxit, Olivier Robin, Alain Berry
This paper aims at developing an experimental method to characterize the vibroacoustic response of a panel to a diffuse acoustic field (DAF) excitation with a different laboratory setup than those used in standards (i.e., coupled rooms). The proposed methodology is based on a theoretical model of the DAF and on the measurement of the panel's sensitivity functions, which characterize its vibroacoustic response to wall plane waves. These functions can be estimated experimentally using variations of the reciprocity principle, which are described in the present paper...
June 2017: Journal of the Acoustical Society of America
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