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https://www.readbyqxmd.com/read/28743215/fitness-band-accuracy-in-older-community-dwelling-adults
#1
Elizabeth A Madigan
Fitness bands are widely available and assist with tracking the number of steps taken. However, for older people with slow gaits, shorter step widths and/or use of ambulatory devices, the accuracy of fitness bands for step counting has not been well studied. Using four commercially available fitness bands (Garmin Vivofit2™, Fitbit Flex™, Up3™ and Microsoft Band™), we studied 30 older people with varying ambulatory abilities. We videotaped participants walking and compared the videotaped step count with the fitness band counts...
July 1, 2017: Health Informatics Journal
https://www.readbyqxmd.com/read/28741084/towards-the-prediction-of-flow-induced-shear-stress-distributions-experienced-by-breast-cancer-cells-in-the-lymphatics
#2
S T Morley, D T Newport, M T Walsh
Tumour metastasis in the lymphatics is a crucial step in the progression of breast cancer. The dynamics by which breast cancer cells (BCCs) travel in the lymphatics remains poorly understood. The goal of this work is to develop a model capable of predicting the shear stresses metastasising BCCs experience using numerical and experimental techniques. This paper models the fluidic transport of large particles ([Formula: see text] where [Formula: see text] is the particle diameter and W is the channel width) subjected to lymphatic flow conditions ([Formula: see text]), in a [Formula: see text] microchannel...
July 24, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28735539/strong-size-dependency-on-the-carrier-and-photon-dynamics-in-ingan-gan-single-nanowalls-determined-using-photoluminescence-and-ultrafast-transient-absorption-spectroscopy
#3
S Chouksey, S Sankaranarayanan, V Pendem, P K Saha, S Ganguly, D Saha
Here, we have demonstrated strong size dependency of quasi-equilibrium and nonequilibrium carrier and photon dynamics in InGaN/GaN single nanowalls using photoluminescence and transient absorption spectroscopy. We demonstrate that two-dimensional carrier confinement, strain relaxation, and modified density of states lead to a reduced Stokes shift, smaller full width at half-maxima, increased exciton binding energy, and reduced nonradiative recombination. The ultrafast transient spectroscopy shows that carrier capture is a two-step process dominated by optical phonons and carrier-carrier scattering in succession...
July 26, 2017: Nano Letters
https://www.readbyqxmd.com/read/28727159/children-with-heavy-prenatal-alcohol-exposure-exhibit-atypical-gait-characteristics
#4
Tenille C Taggart, Roger W Simmons, Jennifer D Thomas, Edward P Riley
BACKGROUND: Impaired motor function in children with histories of prenatal exposure to alcohol has been previously reported but, to date, no studies using quantitatively-based analyses have been performed to assess gait in these children. METHODS: Gait of children with (n = 18) or without (n = 26) prenatal alcohol exposure was assessed using an electronically instrumented walkway. Children completed blocks of trials traversing the walkway with different combinations of walking condition (increased, self-paced, and decreased cadence) and direction (forward and backward)...
July 20, 2017: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/28726686/dual-mode-operation-highly-selective-nanohole-array-based-plasmonic-colour-filters
#5
Fatemeh Fouladi Mahani, Arash Mokhtari, Mahdiyeh Mehran
Taking advantage of nanostructured metal films as plasmonic colour filters has been evolved remarkably as an alternative to the conventional technologies of chemical colour filtering. However, most of the proposed plasmonic colour filters depict a poor colour purity focusing on the generating of either the additive or subtractive colours. In this paper, we present dual mode operation plasmonic colour filters employing an opaque aluminium film patterned with sub-wavelength holes. Subtractive colours like cyan, magenta, and yellow are the results of reflection mode of these filters yielding optical efficiencies as high as 70-80 percent and full width at half maximum of the stop-bands up to 40-50 nm...
July 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28725240/appraisal-of-testicular-volumes-volumes-matching-ultrasound-values-referenced-to-stages-of-genital-development
#6
Juan F Sotos, Naomi J Tokar
BACKGROUND: Testicular volumes obtained with orchidometers or external linear measurements in the scrotum (centimeter ruler or calipers) grossly over-estimate ultrasound volumes, have much variability and may not be accurate or reproducible. The reference of the values obtained by orchidometers or US, to age or Tanner stages is not useful to determine the normal values for stages of puberty, because overlapping of ages and values. Pubertal development is determined by two events, genital and pubic hair development, that should be analyzed independently because one could be out of step with the other...
2017: International Journal of Pediatric Endocrinology
https://www.readbyqxmd.com/read/28724627/using-step-width-to-compare-locomotor-biomechanics-between-extinct-non-avian-theropod-dinosaurs-and-modern-obligate-bipeds
#7
P J Bishop, C J Clemente, R E Weems, D F Graham, L P Lamas, J R Hutchinson, J Rubenson, R S Wilson, S A Hocknull, R S Barrett, D G Lloyd
How extinct, non-avian theropod dinosaurs locomoted is a subject of considerable interest, as is the manner in which it evolved on the line leading to birds. Fossil footprints provide the most direct evidence for answering these questions. In this study, step width-the mediolateral (transverse) distance between successive footfalls-was investigated with respect to speed (stride length) in non-avian theropod trackways of Late Triassic age. Comparable kinematic data were also collected for humans and 11 species of ground-dwelling birds...
July 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28711652/dual-task-walking-over-a-compliant-foam-surface-a-comparison-of-people-with-transfemoral-amputation-and-controls
#8
Sara J Morgan, Brian J Hafner, Valerie E Kelly
People with lower limb amputation are unable to reliably sense ground characteristics due to compromised sensory inputs from the missing limb. As a result, they may rely on compensatory strategies, such as use of cognitive resources, when walking over complex surfaces. This study examined interactions between cognition and walking over a compliant surface in 14 people with transfemoral amputation (TFA) and 14 controls using a dual-task paradigm. Walking was assessed with quantitative motion analysis in both single-task (walking alone) and dual-task (walking while performing a cognitive task) conditions over a compliant foam surface...
July 10, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28710911/a-novel-technique-for-reduction-malarplasty-by-inward-displacement-of-infractured-zygomatic-arch-without-fixation
#9
Qingfeng Li, Bowen Gao, Ke Li, Feng Xie, Hainan Zhu, Liang-Gang Yu
PURPOSE: Reduction malarplasty is one of the most common esthetic surgical procedures performed in the Asian population. Traditional procedures have several complications, such as bone nonunion, malunion, cheek drooping, and damage to the infraorbital nerve and maxillary sinus. Therefore, a more straightforward and effective method of reducing the width of the midface is needed. In this study, we introduce an infracture technique using inward displacement of the zygomatic arch without fixation...
June 24, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28709904/the-effects-of-gaze-stabilization-on-gait-parameters-in-individuals-with-parkinson-s-disease
#10
Rebecca J Reed-Jones, Douglas W Powell
The purpose of this study was to examine the effects of gaze fixation on head stabilization and gait during straight over ground walking in individuals with Parkinson's disease (PD). Eight individuals with PD (Age: 62.3±8.1 years) volunteered for the study. Full body kinematic data were collected at 120Hz using a Vicon motion capture system. Two visual conditions were used to determine the effects of gaze fixation: FREE gaze and FIXED gaze. During FIXED gaze, participants were required to fixate on a still target 13m ahead...
July 11, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28707062/when-an-object-appears-unexpectedly-foot-placement-during-obstacle-circumvention-in-children-and-adults-with-developmental-coordination-disorder
#11
K Wilmut, A L Barnett
Adjustments to locomotion to avoid an obstacle require a change to the usual pattern of foot placement, i.e. changes to step length and/or step width. Previous studies have demonstrated a difficulty in individuals with Developmental Coordination Disorder (DCD) in controlling stability while both stepping over and while circumventing an obstacle. In a previous study, we have considered the way in which individuals with DCD prepare for the possibility of an obstacle appearing (Wilmut and Barnett in Exp Brain Res 235:1531-1340, 2017)...
July 13, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28695581/trophic-redundancy-among-fishes-in-an-east-african-nearshore-seagrass-community-inferred-from-stable-isotope-analysis
#12
P Matich, J J Kiszka, K R Gastrich, M R Heithaus
Stable-isotope analysis supplemented with stomach contents data from published sources was used to quantify the trophic niches, trophic niche overlaps and potential trophic redundancy for the most commonly caught fish species from an East African nearshore seagrass community. This assessment is an important first step in quantifying food-web structure in a region subject to intense fishing activities. Nearshore food webs were driven by at least two isotopically distinct trophic pathways, algal and seagrass, with a greater proportion of the sampled species feeding within the seagrass food web (57%) compared with the algal food web (33%)...
July 11, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28689393/inter-and-intra-observer-variability-of-the-volume-of-cervical-ossification-of-the-posterior-longitudinal-ligament-using-medical-image-processing-software
#13
Dong Ah Shin, Gyu Yeul Ji, Chang Hyun Oh, Keung Nyun Kim, Do Heum Yoon, Hyunchul Shin
OBJECTIVE: Computed tomography (CT)-based method of three dimensional (3D) analysis (MIMICS(®), Materialise, Leuven, Belgium) is reported as very useful software for evaluation of OPLL, but its reliability and reproducibility are obscure. This study was conducted to evaluate the accuracy of MIMICS(®) system, and inter- and intra-observer reliability in the measurement of OPLL. METHODS: Three neurosurgeons independently analyzed the randomly selected 10 OPLL cases with medical image processing software (MIMICS(®)) which create 3D model with Digital Imaging and Communication in Medicine (DICOM) data from CT images after brief explanation was given to examiners before the image construction steps...
July 2017: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/28687151/control-of-lateral-weight-transfer-is-associated-with-walking-speed-in-individuals-post-stroke
#14
HaoYuan Hsiao, Vicki L Gray, Robert A Creath, Stuart A Binder-Macleod, Mark W Rogers
Restoring functional gait speed is an important goal for rehabilitation post-stroke. During walking, transferring of one's body weight between the limbs and maintaining balance stability are necessary for independent functional gait. Although it is documented that individuals post-stroke commonly have difficulties with performing weight transfer onto their paretic limbs, it remains to be determined if these deficits contributed to slower walking speeds. The primary purpose of this study was to compare the weight transfer characteristics between slow and fast post-stroke ambulators...
June 23, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28684089/quantitative-analysis-of-the-tumor-suppressor-dendrogenin-a-using-liquid-chromatography-tandem-mass-spectrometry
#15
Emmanuel Noguer, Régis Soules, Claude Netter, Citra Nagarathinam, Julie Leignadier, Emilie Huc-Claustre, Nizar Serhan, Arnaud Rives, Philippe de Medina, Sandrine Silvente-Poirot, Marc Poirot
Dendrogenin A (DDA) was recently identified as a mammalian cholesterol metabolite that displays tumor suppressor and neurostimulating properties at low doses. In breast tumors, DDA levels were found to be decreased compared to normal tissues, evidencing a metabolic deregulation of DDA production in cancers. DDA is an amino-oxysterol that contains three protonatable nitrogen atoms. This makes it physico-chemically different from other oxysterols and it therefore requires specific analytical methods We have previously used a two-step method for the quantification of DDA in biological samples: 1) DDA purification from a Bligh and Dyer extract by RP-HPLC using a 250×4...
July 3, 2017: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/28682840/functional-balance-deterioration-on-daily-activities-in-patients-with-migraine-a-controlled-study
#16
Gabriela F Carvalho, Lidiane L Florencio, Carina F Pinheiro, Fabiola Dach, Marcelo E Bigal, Débora Bevilaqua-Grossi
OBJECTIVE: This study aimed to assess functional activities in different subgroups of patients with migraine. DESIGN: One-hundred forty subjects were uniformly divided into the following four groups: headache-free controls, migraine with aura, without aura, and chronic migraine. Subjects performed the tests walk across, tandem walk, sit to stand, and step up and over at the Balance Master system (Neurocom). RESULTS: All migraine groups had slower velocity and shorter step length at the walk across test (P < 0...
July 7, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28680797/a-modified-squeeze-equation-for-predicting-the-filling-ratio-of-nanoimprint-lithography
#17
JiHyeong Ryu, Ho Lee, Sang-Ho Lee, HyungJun Lim, JaeJong Lee
A numerical method using the modified squeeze model is proposed in this paper in order to overcome the limitation of the established squeeze equation and obtain filling ratios for nanoimprint lithography (NIL). Because the imprinting velocity is overestimated when the ratio of indenter width to polymer thickness is close to unity, the modified equation is critical. For verification, the numerical results are compared with the experimental data according to the various stamp geometries and pressure variation rates, for which a maximum difference of 10% is indicated...
2017: Nano Convergence
https://www.readbyqxmd.com/read/28677894/metallic-conductive-nanowires-elaborated-by-pvd-metal-deposition-on-suspended-dna-bundles
#18
Christophe Brun, Pierre-Henri Elchinger, Guillaume Nonglaton, Cheikh Tidiane-Diagne, Raluca Tiron, Aurélie Thuaire, Didier Gasparutto, Xavier Baillin
Metallic conductive nanowires (NWs) with DNA bundle core are achieved, thanks to an original process relying on double-stranded DNA alignment and physical vapor deposition (PVD) metallization steps involving a silicon substrate. First, bundles of DNA are suspended with a repeatable process between 2 µm high parallel electrodes with separating gaps ranging from 800 nm to 2 µm. The process consists in the drop deposition of a DNA lambda-phage solution on the electrodes followed by a naturally evaporation step...
July 5, 2017: Small
https://www.readbyqxmd.com/read/28674793/intravenous-vs-oral-hydration-administration-for-optimal-ureteral-opacification-in-computer-tomographic-urography
#19
Kimberly Weatherspoon, Sara Smolinski, Dmitry Rakita, Carlos Valdes, Jane Garb, Victoria Podsiadlo, Maria Waslick, Alena Kreychman
PURPOSE: Computed tomographic urography (CTU) is the gold standard in the radiologic detection of urinary tract disease. The goals of CTU protocols are to garner fully distended and opacified collecting systems, ureters, and bladder for adequate evaluation. Multiple techniques have been reported in the literature to optimize urinary tract visualization and enhance genitourinary assessment. However, currently no strict guidelines exist regarding the preferred method for optimal urinary tract opacification in CTU...
July 3, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28672803/static-and-dynamic-accuracy-of-an-innovative-miniaturized-wearable-platform-for-short-range-distance-measurements-for-human-movement-applications
#20
Stefano Bertuletti, Andrea Cereatti, Daniele Comotti, Michele Caldara, Ugo Della Croce
Magneto-inertial measurement units (MIMU) are a suitable solution to assess human motor performance both indoors and outdoors. However, relevant quantities such as step width and base of support, which play an important role in gait stability, cannot be directly measured using MIMU alone. To overcome this limitation, we developed a wearable platform specifically designed for human movement analysis applications, which integrates a MIMU and an Infrared Time-of-Flight proximity sensor (IR-ToF), allowing for the estimate of inter-object distance...
June 24, 2017: Sensors
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