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https://www.readbyqxmd.com/read/27921071/validation-of-automatic-joint-space-width-measurements-in-hand-radiographs-in-rheumatoid-arthritis
#1
Olga Schenk, Yinghe Huo, Koen L Vincken, Mart A van de Laar, Ina H H Kuper, Kees C H Slump, Floris P J G Lafeber, Hein J Bernelot Moens
Computerized methods promise quick, objective, and sensitive tools to quantify progression of radiological damage in rheumatoid arthritis (RA). Measurement of joint space width (JSW) in finger and wrist joints with these systems performed comparable to the Sharp-van der Heijde score (SHS). A next step toward clinical use, validation of precision and accuracy in hand joints with minimal damage, is described with a close scrutiny of sources of error. A recently developed system to measure metacarpophalangeal (MCP) and proximal interphalangeal (PIP) joints was validated in consecutive hand images of RA patients...
October 2016: Journal of Medical Imaging
https://www.readbyqxmd.com/read/27915220/stability-maneuverability-trade-offs-during-lateral-steps
#2
Julian Acasio, Mengnan/Mary Wu, Nicholas P Fey, Keith E Gordon
Selecting a specific foot placement strategy to perform walking maneuvers requires the management of several competing factors, including: maintaining stability, positioning oneself to actively generate impulses, and minimizing mechanical energy requirements. These requirements are unlikely to be independent. Our purpose was to determine the impact of lateral foot placement on stability, maneuverability, and energetics during walking maneuvers. Ten able-bodied adults performed laterally-directed walking maneuvers...
November 23, 2016: Gait & Posture
https://www.readbyqxmd.com/read/27913329/2-d-ultrasound-sparse-arrays-multidepth-radiation-optimization-using-simulated-annealing-and-spiral-array-inspired-energy-functions
#3
Emmanuel Roux, Alessandro Ramalli, Piero Tortoli, Christian Cachard, Marc C Robini, Herve Liebgott
Full matrix arrays are excellent tools for 3-D ultrasound imaging, but the required number of active elements is too high to be individually controlled by an equal number of scanner channels. The number of active elements is significantly reduced by the sparse array techniques, but the position of the remaining elements must be carefully optimized. This issue is faced here by introducing novel energy functions in the simulated annealing (SA) algorithm. At each iteration step of the optimization process, one element is freely translated and the associated radiated pattern is simulated...
December 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27909356/effects-of-three-weeks-of-whole-body-vibration-training-on-joint-position-sense-balance-and-gait-in-children-with-cerebral-palsy-a-randomized-controlled-study
#4
Myung-Sook Ko, Yon Ju Sim, Do Hyun Kim, Hye-Seon Jeon
Purpose : To observe the effects of whole-body vibration (WBV) training in conjunction with conventional physical therapy (PT) on joint-position sense (JPS), balance, and gait in children with cerebral palsy (CP). Methods: In this randomized controlled study, 24 children with CP were randomly selected either to continue their conventional PT or to receive WBV in conjunction with their conventional PT programme. Exposure to the intervention was intermittent (3 min WBV, 3 min rest) for 20 minutes, twice weekly for 3 weeks...
2016: Physiotherapy Canada. Physiothérapie Canada
https://www.readbyqxmd.com/read/27908068/perception-of-music-dynamics-in-concert-hall-acoustics
#5
Jukka Pätynen, Tapio Lokki
Dynamics is one of the principal means of expressivity in Western classical music. Still, preceding research on room acoustics has mostly neglected the contribution of music dynamics to the acoustic perception. This study investigates how the different concert hall acoustics influence the perception of varying music dynamics. An anechoic orchestra signal, containing a step in music dynamics, was rendered in the measured acoustics of six concert halls at three seats in each. Spatial sound was reproduced through a loudspeaker array...
November 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27905317/tip-convolution-on-hopg-surfaces-measured-in-am-afm-and-interpreted-using-a-combined-experimental-and-simulation-approach
#6
Xiaoli Hu, Nicholas Chan, Ashlie Martini, Philip Egberts
Amplitude modulated atomic force microscopy (AM-AFM) was used to examine the influence of the size of the AFM tip apex on the measured surface topography of single highly oriented pyrolytic graphite (HOPG) atomic steps. Experimental measurements were complemented by molecular dynamics simulations of AM-AFM and the results from both were evaluated by comparison of the measured or simulated width of the topography at the step to that predicted using simple rigid-body geometry. The results showed that the step width, which is a reflection of the resolution of the measurement, increased with tip size, as expected, but also that the difference between the measured/simulated step width and the geometric calculation was tip size dependent...
December 1, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27903323/reproductive-ecology-of-phorid-parasitoids-in-relation-to-the-head-size-of-leaf-cutting-ants-atta-sexdens-forel
#7
C F Farder-Gomes, M A Oliveira, P L Gonçalves, L M Gontijo, J C Zanuncio, M A L Bragança, E M Pires
The leaf-cutting ant Atta sexdens Forel (Hymenoptera: Formicidae) is one of the most damaging agricultural pests in the Neotropics. Management strategies predominantly rely on the use of general insecticides. What is needed are more species-specific and environmentally friendly options. Parasitioids such as phorid flies (Diptera: Phoridae) may be one such option, but a greater understanding of the ecology of the flies and their ant hosts is essential to devise biological control strategies. Here we report parasitism rates, ant host size, parasitoid abundance per host and resultant sex ratios of two phorid species Apocephalus attophilus Borgmeier and Eibesfeldtphora tonhascai Brown parasitizing A...
December 1, 2016: Bulletin of Entomological Research
https://www.readbyqxmd.com/read/27897410/androgen-deprivation-causes-selective-deficits-in-the-biomechanical-leg-muscle-function-of-men-during-walking-a-prospective-case-control-study
#8
Ada S Cheung, Hans Gray, Anthony G Schache, Rudolf Hoermann, Daryl Lim Joon, Jeffrey D Zajac, Marcus G Pandy, Mathis Grossmann
BACKGROUND: Although muscle mass declines with testosterone deficiency in men, previous studies of muscle function have not demonstrated consistent deficits, likely due to relatively insensitive methodology. Our objective was to determine the effects of testosterone deprivation on the biomechanical function of individual lower-limb muscles. METHODS: We conducted a 12-month prospective, observational case-control study of 34 men newly commencing androgen deprivation treatment (ADT) for prostate cancer and 29 age-matched prostate cancer controls...
August 2, 2016: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/27889188/dynamic-margin-of-stability-during-gait-is-altered-in-persons-with-multiple-sclerosis
#9
Alexander T Peebles, Alyson Reinholdt, Adam P Bruetsch, Sharon G Lynch, Jessie M Huisinga
Persons with multiple sclerosis (PwMS) have high fall risk due to altered balance. To measure dynamic balance during walking, margin of stability (MoS) examines how the extrapolated center of mass moves relative to the base of support. This study investigates how MoS is affected in PwMS during walking at preferred, slow, and fast speeds, as well as the relationship between MoS and the Expanded Disability Severity Score (EDSS), fall history, and self-report balance confidence questionnaire. MoS was evaluated in PwMS without clinical gait impairment (MS1; n=20), PwMS with clinical gait impairment (MS2; n=20), and age-matched healthy controls (HC) (n=20), in the anterior/posterior (AP) and medial/lateral (ML) direction at heel strike and midstance...
November 10, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27885684/interference-free-mass-spectrometric-detection-of-capillary-isoelectric-focused-proteins-including-charge-variants-of-a-model-monoclonal-antibody
#10
Jens Hühner, Kevin Jooß, Neusüß Christian
CIEF represents an elegant technique especially for the separation of structural similar analytes, whereas MS is a state of the art instrumentation for the identification and characterization of biomolecules. The combination of both techniques can be realized by hyphenating CIEF with CZE-ESI-MS applying a mechanical valve. During the CZE step, the remaining ESI-interfering components of the CIEF electrolyte are separated from the analytes prior to MS detection. In this work, a multiple heart-cut approach is presented expanding our previous single heart-cut concept resulting in a dramatical reduction of analysis time...
November 25, 2016: Electrophoresis
https://www.readbyqxmd.com/read/27878905/effects-of-labial-adhesion-on-maxillary-arch-dimensions-and-nasolabial-esthetics-in-cleft-lip-and-palate-a-systematic-review
#11
REVIEW
Laurent A M Thierens, Nele Brusselaers, Noëmi M C De Roo, Guy A M De Pauw
Labial adhesion is a preliminary surgical lip approximation used in the early management of unilateral and bilateral cleft lip and palate. Our objective was to evaluate its effects on the maxillary arch dimensions and nasolabial esthetics by means of a systematic review. The literature search (1955-2016) was based on MEDLINE via PubMed, Web of Science, Embase, and the Cochrane Library. Studies with labial adhesion as a single preliminary step for definitive lip closure, in combination with nasoalveolar molding or in combination with infant orthopedics were considered eligible...
November 23, 2016: Oral Diseases
https://www.readbyqxmd.com/read/27870605/age-related-differences-in-locomotor-strategies-during-adaptive-walking
#12
Kristin A Lowry, Katherine Sebastian, Subashan Perera, Jessie Van Swearingen, Ann L Smiley-Oyen
Simultaneous control of lower limb stepping movements and trunk motion is important for skilled walking; adapting gait to environmental constraints requires frequent alternations in stepping and trunk motion. These alterations provide a window into the locomotor strategies adopted by the walker. The authors examined gait strategies in young and healthy older adults when manipulating step width. Anteroposterior (AP) and mediolateral (ML) smoothness (quantified by harmonic ratios) and stepping consistency (quantified by gait variability) were analyzed during narrow and wide walking while controlling cadence to preferred pace...
November 21, 2016: Journal of Motor Behavior
https://www.readbyqxmd.com/read/27869638/a-realistic-quantum-capacitance-model-for-quantum-hall-edge-state-based-fabry-p%C3%A3-rot-interferometers
#13
O Kilicoglu, D Eksi, A Siddiki
In this work, the classical and the quantum capacitances are calculated for a Fabry-Pérot interferometer operating in the integer quantized Hall regime. We first consider a rotationally symmetric electrostatic confinement potential and obtain the widths and the spatial distribution of the insulating (incompressible) circular strips using a charge density profile stemming from self-consistent calculations. Modelling the electrical circuit of capacitors composed of metallic gates and incompressible/compressible strips, we investigate the conditions to observe Aharonov-Bohm (quantum mechanical phase dependent) and Coulomb blockade (capacitive coupling dependent) effects reflected in conductance oscillations...
November 21, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27867059/pre-and-unplanned-walking-turns-in-parkinson-s-disease-effects-of-dopaminergic-medication
#14
David Conradsson, Caroline Paquette, Johan Lökk, Erika Franzén
Although dopaminergic medication improves functional mobility in individuals with Parkinson's disease (PD), its effects on walking turns are uncertain. Our goals was to determine whether dopaminergic medication improves preplanned and unplanned walking turns in individuals with PD, compared to healthy controls. Nineteen older adults with mild-to-moderate PD and 17 healthy controls performed one of the following three tasks, presented randomly: walking straight, or walking and turning 180° to the right or left...
November 17, 2016: Neuroscience
https://www.readbyqxmd.com/read/27857408/towards-unsupervised-fluorescence-lifetime-imaging-using-low-dimensional-variable-projection
#15
Yongliang Zhang, Annie Cuyt, Wen-Shin Lee, Giovanni Lo Bianco, Gang Wu, Yu Chen, David Day-Uei Li
Analyzing large fluorescence lifetime imaging (FLIM) data is becoming overwhelming; the latest FLIM systems easily produce massive amounts of data, making an efficient analysis more challenging than ever. In this paper we propose the combination of a custom-fit variable projection method, with a Laguerre expansion based deconvolution, to analyze bi-exponential data obtained from time-domain FLIM systems. Unlike nonlinear least squares methods, which require a suitable initial guess from an experienced researcher, the new method is free from manual interventions and hence can support automated analysis...
November 14, 2016: Optics Express
https://www.readbyqxmd.com/read/27855983/comparison-of-base-of-support-size-during-gait-initiation-using-force-plate-and-motion-capture-system-a-bland-and-altman-analysis
#16
E Yiou, C Teyssèdre, R Artico, P Fourcade
This study aimed to estimate the error made by investigators when force-plate data are used to approximate base of support size during gait initiation. Step length and step width obtained with a method based on motion capture system (Kinematics method, considered the "gold standard") and with a method based on the centre of pressure traces obtained from a force-plate (Force-plate method) were purposely compared using descriptive statistics and the Bland and Altman (BA) method. Participants (N=19) performed series of gait initiation in Spontaneous and Maximal Velocity Conditions (SVC and MVC, respectively)...
November 10, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27855362/are-the-arms-and-head-required-to-accurately-estimate-centre-of-mass-motion-during-running
#17
Niamh Gill, Stephen J Preece, Samantha Young, Christopher Bramah
Accurate measurement of centre of mass (CoM) motion can provide valuable insight into the biomechanics of human running. However, full-body kinematic measurement protocols can be time consuming and difficult to implement. Therefore, this study was performed to understand whether CoM motion during running could be estimated from a model incorporating only lower extremity, pelvic and trunk segments. Full-body kinematic data was collected whilst (n=12) participants ran on a treadmill at two speeds (3.1 and 3.9ms(-1))...
January 2017: Gait & Posture
https://www.readbyqxmd.com/read/27834433/late-stage-drainage-of-block-copolymer-stabilized-emulsion-drops
#18
Damith P Rozairo, Andrew B Croll
Polymer covered emulsion droplets have a considerable number of applications ranging from active cosmetics to advance drug delivery systems. In many of these systems the emulsion droplets do not exist in isolation but interact with other drops, surfaces and particles. In a step towards understanding how these complex mechanical interactions take place, we examine the interaction between a block copolymer covered emulsion droplet (polystyrene-b-poly(ethylene oxide) (PS-PEO) covered toluene) and a flat mica interface...
November 11, 2016: Soft Matter
https://www.readbyqxmd.com/read/27832952/cross-slope-and-level-walking-strategies-during-swing-in-individuals-with-a-lower-limb-amputation
#19
Coralie Villa, Isabelle Loiret, Karine Langlois, Xavier Bonnet, François Lavaste, Pascale Fodé, Hélène Pillet
OBJECTIVE: The aim of this study was to quantitatively analyze prosthetic limb swing phase gait strategies used to adapt to cross-slopes compared to level walking. DESIGN: Cross-sectional study SETTING: Gait laboratory PARTICIPANTS: A volunteer sample of seventeen individuals with a transfemoral amputation, fifteen individuals with a transtibial amputation and seventeen able-bodied subjects. INTERVENTIONS: Participants walked on level and 6° (10%) cross slope surfaces at a self-selected walking speed...
November 7, 2016: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/27826525/nanostructured-germanium-deposited-on-heated-substrates-with-enhanced-photoelectric-properties
#20
Ionel Stavarache, Valentin Adrian Maraloiu, Petronela Prepelita, Gheorghe Iordache
Obtaining high-quality materials, based on nanocrystals, at low temperatures is one of the current challenges for opening new paths in improving and developing functional devices in nanoscale electronics and optoelectronics. Here we report a detailed investigation of the optimization of parameters for the in situ synthesis of thin films with high Ge content (50 %) into SiO2. Crystalline Ge nanoparticles were directly formed during co-deposition of SiO2 and Ge on substrates at 300, 400 and 500 °C. Using this approach, effects related to Ge-Ge spacing are emphasized through a significant improvement of the spatial distribution of the Ge nanoparticles and by avoiding multi-step fabrication processes or Ge loss...
2016: Beilstein Journal of Nanotechnology
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