keyword
MENU ▼
Read by QxMD icon Read
search

Force

keyword
https://www.readbyqxmd.com/read/29055245/biomechanical-analysis-of-an-interference-screw-and-a-novel-twist-lock-screw-design-for-bone-graft-fixation
#1
S Asnis, J Mullen, P D Asnis, N Sgaglione, T LaPorta, D A Grande, N O Chahine
BACKGROUND: Malpositioning of an anterior cruciate ligament graft during reconstruction can occur during screw fixation. The purpose of this study is to compare the fixation biomechanics of a conventional interference screw with a novel Twist Lock Screw, a rectangular shaped locking screw that is designed to address limitations of graft positioning and tensioning. METHODS: Synthetic bone (10, 15, 20lb per cubic foot) were used simulating soft, moderate, and dense cancellous bone...
October 10, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/29055244/a-pilot-study-comparing-mechanical-properties-of-tissue-engineered-cartilages-and-various-endogenous-cartilages
#2
Andrew K Pappa, Sajjad Soleimani, Montserrat Caballero, Alexandra E Halevi, John A van Aalst
BACKGROUND: Mechanical properties of tissue-engineered cartilage and a variety of endogenous cartilage were measured. The main goal was to evaluate if the tissue-engineered cartilage have similar mechanical characteristics to be replaced with rib cartilage in microtia reconstruction. Such study lays the foundation for future human clinical trials for microtia reconstruction. METHOD: Atomic force microscopy and compression testing were used to measure the viscoelasticity of tissue-engineered cartilage (stem cell seeded on Poly lactic co-glycolytic acid nanofibers and Pellet) and endogenous cartilage: conchal bowl, microtic ears, preauricular remnants, and rib...
October 10, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/29055238/patterns-produced-by-dried-droplets-of-protein-binary-mixtures-suspended-in-water
#3
Yojana J P Carreón, Jorge González-Gutiérrez, M I Pérez-Camacho, Hilda Mercado-Uribe
Patterns formed by the evaporation of a drop containing biological molecules have provided meaningful information about certain pathologies. In this context, several works propose the study of protein solutions as a model to understand the formation of deposits of biological fluids. Generally, dry droplets of proteins in a saline solution create complex aggregates. Here, we present an experimental study on the formation of patterns produced by the evaporation of droplet suspensions containing a protein binary mixture...
October 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29055170/global-climate-change-increases-risk-of-crop-yield-losses-and-food-insecurity-in-the-tropical-andes
#4
Richard Tito, Heraldo L Vasconcelos, Kenneth J Feeley
One of the greatest current challenges to human society is ensuring adequate food production and security for a rapidly growing population under changing climatic conditions. Climate change, and specifically rising temperatures, will alter the suitability of areas for specific crops and cultivation systems. In order to maintain yields, farmers may be forced to change cultivation practices, the timing of cultivation, or even the type of crops grown. Alternatively, farmers can change the location where crops are cultivated (e...
October 21, 2017: Global Change Biology
https://www.readbyqxmd.com/read/29055169/diversification-in-tropics-and-subtropics-following-the-mid-miocene-climate-change-a-case-study-of-the-spider-genus-nesticella
#5
Francesco Ballarin, Shuqiang Li
Caves may offer suitable refugia for troglophilic invertebrates during periods of unfavourable climatic conditions because of their stable microclimates. As a consequence, allopatric divergence from their epigean counterparts may occur, leading to formation of truly hypogean communities (the Climatic Relict Hypothesis). Unlike the well-studied effects of Pleistocene glaciations, we know little about how ancient climate changes drove the development of cave-dwelling organisms living at both middle and lower latitudes...
October 21, 2017: Global Change Biology
https://www.readbyqxmd.com/read/29055159/genomics-of-natural-populations-evolutionary-forces-that-establish-and-maintain-gene-arrangements-in-drosophila-pseudoobscura
#6
Zachary L Fuller, Gwilym D Haynes, Stephen Richards, Stephen W Schaeffer
The evolution of complex traits in heterogeneous environments may shape the order of genes within chromosomes. Drosophila pseudoobscura has a rich gene arrangement polymorphism that allows one to test evolutionary genetic hypotheses about how chromosomal inversions are established in populations. D. pseudoobscura has >30 gene arrangements on a single chromosome that were generated through a series of overlapping inversion mutations with > 10 inversions with appreciable frequencies and wide geographic distributions...
October 21, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/29055157/simulating-the-onset-of-spring-vegetation-growth-across-the-northern-hemisphere
#7
Qiang Liu, Yongshuo H Fu, Yongwen Liu, Ivan A Janssens, Shilong Piao
Changes in the spring onset of vegetation growth in response to climate change can profoundly impact climate-biosphere interactions. Thus, robust simulation of spring onset is essential to accurately predict ecosystem responses and feedback to ongoing climate change. To date, the ability of vegetation phenology models to reproduce spatiotemporal patterns of spring onset at larger scales has not been thoroughly investigated. In this study, we took advantage of phenology observations via remote sensing to calibrate and evaluated six models, including both one-phase (considering only forcing temperatures) and two-phase (involving forcing, chilling, and photoperiod) models across the Northern Hemisphere between 1982 and 2012...
October 21, 2017: Global Change Biology
https://www.readbyqxmd.com/read/29055127/shoe-floor-interactions-in-human-walking-with-slips-modeling-and-experiments
#8
Mitja Trkov, Jingang Yi, Tao Liu, Kang Li
Shoe-floor interactions play a crucial role in determining the possibility of potential slip and fall during human walking. Biomechanical and tribological parameters influence the friction characteristics between the shoe sole and the floor and the existing work mainly focus on experimental studies. In this paper, we present modeling, analysis, and experiments to understand slip and force distributions between the shoe sole and floor surface during human walking. We present results for both soft and hard sole material...
October 21, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29054821/an-in-vitro-experiment-to-simulate-how-easy-tablets-are-to-swallow
#9
M Marconati, S Raut, A Burbidge, J Engmann, M Ramaioli
The compliance of patients to solid oral dosage forms is heavily conditioned by the perceived ease of swallowing, especially in geriatric and pediatric populations. This study proposes a method, based on an in vitro model of the human oropharyngeal cavity, to quantitatively study the oral phase of human swallowing in presence of single or multiple tablets. The dynamics of swallowing was investigated varying the size and shape of model tablets and adjusting the applied force to the mechanical setup to simulate tongue pressure variations among individuals...
October 17, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29054746/the-influence-of-cadence-and-shoes-on-patellofemoral-joint-kinetics-in-runners-with-patellofemoral-pain
#10
Jason Bonacci, Michelle Hall, Aaron Fox, Natalie Saunders, Tristan Shipsides, Bill Vicenzino
OBJECTIVES: To determine the effect of a combination of a minimalist shoe and increased cadence on measures of patellofemoral joint loading during running in individuals with patellofemoral pain. DESIGN: Within-participant repeated measures with four conditions presented in random order: (1) control shoe at preferred cadence; (2) control shoe with +10% cadence; (3) minimalist shoe at preferred cadence; (4) minimalist shoe with +10% cadence. METHODS: Fifteen recreational runners with patellofemoral pain ran on an instrumented treadmill while three-dimensional motion capture data were acquired...
October 6, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29054726/a-comparison-of-walking-gait-following-mechanical-and-kinematic-alignment-in-total-knee-joint-replacement
#11
Peter J McNair, Mark G Boocock, Nicholas D Dominick, Richard J Kelly, Bill J Farrington, Simon W Young
BACKGROUND: Although previous studies have compared radiological, pain, and function scores in kinematically aligned (KA) and mechanically aligned (MA) total knee arthroplasty (TKA), no previous studies have undertaken a three-dimensional (3D) gait analysis in these groups. This study compared kinematic and kinetic variables recorded during level walking in patients at least 2 years post-surgery who underwent an MA or KA procedure. METHODS: Utilizing a 9-camera motion analysis system, gait analysis was undertaken on 29 patients (MA = 15, KA = 14)...
September 21, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29054609/estimating-the-l5s1-flexion-extension-moment-in-symmetrical-lifting-using-a-simplified-ambulatory-measurement-system
#12
Axel S Koopman, Idsart Kingma, Gert S Faber, Jonas Bornmann, Jaap H van Dieën
Mechanical loading of the spine has been shown to be an important risk factor for the development of low-back pain. Inertial motion capture (IMC) systems might allow measuring lumbar moments in realistic working conditions, and thus support evaluation of measures to reduce mechanical loading. As the number of sensors limits applicability, the objective of this study was to investigate the effect of the number of sensors on estimates of L5S1 moments. Hand forces, ground reaction forces (GRF) and full-body kinematics were measured using a gold standard (GS) laboratory setup...
October 12, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29054531/the-ammonia-transporter-rhcg-modulates-urinary-acidification-by-interacting-with-the-vacuolar-proton-atpases-in-renal-intercalated-cells
#13
Soline Bourgeois, Lisa Bounoure, Isabelle Mouro-Chanteloup, Yves Colin, Dennis Brown, Carsten A Wagner
Ammonium, stemming from renal ammoniagenesis, is a major urinary proton buffer and is excreted along the collecting duct. This process depends on the concomitant secretion of ammonia by the ammonia channel RhCG and of protons by the vacuolar-type proton-ATPase pump. Thus, urinary ammonium content and urinary acidification are tightly linked. However, mice lacking Rhcg excrete more alkaline urine despite lower urinary ammonium, suggesting an unexpected role of Rhcg in urinary acidification. RhCG and the B1 and B2 proton-ATPase subunits could be co-immunoprecipitated from kidney...
October 17, 2017: Kidney International
https://www.readbyqxmd.com/read/29054477/-update-on-recommendations-for-screening-for-hydroxychloroquine-retinopathy
#14
A Couturier, A Giocanti-Aurégan, B Dupas, J-F Girmens, Y Le Mer, N Massamba, E Barreau, I Audo
INTRODUCTION: Recommendations for screening for chloroquine (CQ) and hydroxychloroquine (HCQ) retinopathy have recently been changed by the American Academy of Ophthalmology, taking into account new published data on toxicity prevalence, risk factors, location of onset in the retina and the efficacy of screening tests. METHODS: Literature review. RESULTS AND DISCUSSION: The risk of developing CQ or HCQ retinopathy depends on the daily dose and duration of treatment...
October 17, 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/29054438/applications-of-ionic-liquids-in-biphasic-separation-aqueous-biphasic-systems-and-liquid-liquid-equilibria
#15
REVIEW
Shashi Kant Shukla, Shubha Pandey, Siddharth Pandey
Ionic liquids (ILs) have been receiving much attention in many fields of analytical chemistry because of their various interesting properties which distinguish them from volatile organic compounds. They offer both directional and non-directional forces towards a solute molecule and therefore act as excellent solvents for a wide range of polar and non-polar compounds. Because of the presence of various possible interactions, ILs easily undergo biphasic separation with water and other less polar/non-polar organic solvents...
October 10, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29054339/force-estimation-in-fatigue-condition-using-a-muscle-twitch-model-during-isometric-finger-contraction
#16
Youngjin Na, Sangjoon J Kim, Jung Kim
We propose a force estimation method in fatigue condition using a muscle-twitch model and surface electromyography (sEMG). The twitch model, which is an estimate of force by a single spike, was obtained from sEMG features and measured forces. Nine healthy subjects performed isometric index finger abduction until exhaustion for a series of dynamic contractions (0-20% MVC) to characterize the twitch model and static contractions (50% MVC) to induce muscle fatigue. Muscle fatigue was identified based on the changes of twitch model; the twitch peak decreased and the contraction time increased as muscle fatigue developed...
October 17, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/29054327/sex-differences-in-anticipatory-postural-adjustments-during-rapid-single-leg-lift
#17
Melanie D Bussey, Marcelo Peduzzi de Castro, Daniela Aldabe, Jonathan Shemmell
The aim of this study was to assess the influence of sex on the kinetic, kinematic and neuromuscular correlates of anticipatory postural adjustments (APAs) during a single leg lift task performed by healthy participants. Fifty healthy age and body mass index matched participants (25 women and 25 men) performed 20 single leg lift task (hip flexion to 90 ° as quickly as possible) with their dominant and their non-dominant lower limbs. A force plate was used to determine the medial-lateral displacement of the center of pressure (COPML), and the initiation of weight shift (T0); kinematics was used to determine leg lift (T1); and electromyography was used to determine onset times from eight muscles: bilateral external oblique, internal oblique and lumbar multifidus, and unilateral (stance limb) gluteus maximus and biceps femoris...
October 17, 2017: Human Movement Science
https://www.readbyqxmd.com/read/29054308/acc-aats-aha-ase-eacts-hvs-sca-scai-scct-scmr-sts-2017-appropriate-use-criteria-for-the-treatment-of-patients-with-severe-aortic-stenosis-a-report-of-the-american-college-of-cardiology-appropriate-use-criteria-task-force-american-association-for-thoracic-surgery
#18
https://www.readbyqxmd.com/read/29054210/the-society-of-thoracic-surgeons-general-thoracic-surgery-database-2017-update-on-research
#19
Henning A Gaissert, Felix G Fernandez, Traves Crabtree, William R Burfeind, Mark S Allen, Mark I Block, Paul H Schipper, Jeffrey P Jacobs, Robert H Habib, David M Shahian
The outcomes research efforts based on The Society of Thoracic Surgeons (STS) General Thoracic Surgery Database include two established research programs with dedicated task forces and with data analyses conducted at the STS data analytic center: (1) The STS-sponsored research by the Access and Publications program, and (2) grant and institutionally funded research by the Longitudinal Follow-Up and Linked Registries Task Force. Also, the STS recently introduced the research program enabling investigative teams to apply for access to deidentified patient-level General Thoracic Surgery Database data sets and conduct related analyses at their own institution...
November 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/29054096/simplified-autodock-force-field-for-hydrated-binding-sites
#20
Marek Wojciechowski
A set of high quality structures of protein-ligand complexes with experimentally determined binding affinities has been extracted from the Protein Data Bank and used to test and recalibrate AutoDock force field. Since for some binding sites water molecules are crucial for bridging the receptor-ligand interactions, they have to be included in the analysis. To simplify the process of incorporating water molecules into the binding sites and make it less ambiguous, new simple water model was created. After recalibration of the force field on the new dataset much better correlation between the computed and experimentally determined binding affinities was achieved and the quality of pose prediction improved even more...
September 23, 2017: Journal of Molecular Graphics & Modelling
keyword
keyword
106801
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"