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https://www.readbyqxmd.com/read/28530478/validity-of-a-linear-velocity-transducer-for-testing-maximum-vertical-jumps
#1
Alejandro Pérez-Castilla, Belén Feriche, Slobodan Jaric, Paulino Padial, Amador García-Ramos
This study aimed to examine the validity of mechanical variables obtained by a linear velocity transducer from the unconstrained and constrained squat jump (SJ). Twenty-three men were tested on the unconstrained SJ and the SJ constrained by a Smith machine. Maximum values of force, velocity, and power were simultaneously recorded both by a linear velocity transducer attached to a bar of mass of 17, 30, 45, 60 and 75 kg and by a force plate. Linear velocity transducer generally overestimated the outcomes measured as compared to the force plate, particularly in unconstrained SJ...
May 22, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28530184/green-synthesis-of-silver-nanoparticles-using-mentha-pulegium-and-investigation-of-their-antibacterial-antifungal-and-anticancer-activity
#2
Ali Hamad Abd Kelkawi, Abolghasem Abbasi Kajani, Abdol-Khalegh Bordbar
A simple and eco-friendly method for efficient synthesis of stable colloidal silver nanoparticles (AgNPs) using Mentha pulegium extracts is described. A series of reactions was conducted using different types and concentrations of plant extract as well as metal ions to optimize the reaction conditions. AgNPs were characterized by using UV-vis spectroscopy, transmission electron microscopy, atomic force microscopy, dynamic light scattering, zetasizer, energy-dispersive X-ray spectroscopy (EDAX) and Fourier transform infrared spectroscopy (FTIR)...
June 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28528238/effects-of-grab-bar-on-utilized-friction-and-dynamic-stability-when-elderly-people-enter-the-bathtub
#3
Yusuke Sekiguchi, Tomohisa Kato, Keita Honda, Hiroyasu Kanetaka, Shin-Ichi Izumi
BACKGROUND: The effect of the grab bar on dynamic stability when elderly people enter the bathtub remains unclear. The purpose of the present study is to examine the age-related effect of the grab bar on dynamic stability during lateral stepping over an obstacle when entering bathtub. METHODS: Sixteen young, healthy adults and sixteen elderly adults participated. The subjects performed lateral stepping over an obstacle with and without vertical and horizontal bars...
May 10, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28523160/do-low-profile-implants-provide-reliable-stability-in-fixing-the-sternal-fractures-as-a-fourth-vertebral-column-in-sternovertebral-injuries
#4
Sebastian Krinner, Sina Grupp, Pascal Oppel, Andreas Langenbach, Friedrich F Hennig, Stefan Schulz-Drost
BACKGROUND: Flexion and compression forces to the trunk can cause severe instability of the vertebral column and the anterior chest wall, mostly associated with an unstable fracture of the sternum. In combination, the worst case would be a complete disruption of the trunk. Some authors consider the sternum-rib-complex to be the fourth vertebral column. This study discusses the possibilities to treat instable trunk injuries with sternal fractures concomitant to vertebral spine fractures through anterior sternal plating employing a locked plate osteosynthesis in a low profile design instead of the use of bulky implants...
April 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28522976/trunk-muscle-activity-during-drop-jump-performance-in-adolescent-athletes-with-back-pain
#5
Steffen Mueller, Josefine Stoll, Juliane Mueller, Michael Cassel, Frank Mayer
In the context of back pain, great emphasis has been placed on the importance of trunk stability, especially in situations requiring compensation of repetitive, intense loading induced during high-performance activities, e.g., jumping or landing. This study aims to evaluate trunk muscle activity during drop jump in adolescent athletes with back pain (BP) compared to athletes without back pain (NBP). Eleven adolescent athletes suffering back pain (BP: m/f: n = 4/7; 15.9 ± 1.3 y; 176 ± 11 cm; 68 ± 11 kg; 12...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28522235/a-review-of-terrestrial-aerial-and-aquatic-keratins-the-structure-and-mechanical-properties-of-pangolin-scales-feather-shafts-and-baleen-plates
#6
Bin Wang, Tarah N Sullivan
Keratinous materials, omnipresent as the hard and durable epidermal appendages of animals, are one of the toughest biological materials. They exhibit diverse morphologies and structures that serve a variety of amazing and inspiring mechanical functions. In this work, we provide a review of representative terrestrial, aerial and aquatic keratinous materials, pangolin scales, feather shafts and baleen plates, and correlate their hierarchical structures to respective functions of dermal armor, flight material and undersea filter...
May 8, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28516962/design-of-a-customised-bridging-mandibular-prosthesis-for-complex-reconstruction-a-pilot-study
#7
A Tarsitano, S Battaglia, A Sandi, C Marchetti
The gold standard for mandibular reconstruction is universally recognised and consists of the replacement of the bony part of the mandible with a bony microvascular free flap supported by a reconstructive plate. Although this procedure is feasible and reproducible in most patients, at times poor oncological prognosis or poor performance status force surgeons to consider other reconstructive solutions. In these cases, the main alternative in reconstructing a mandibular defect is represented by bridging plates combined with soft tissue flaps...
June 2017: Acta Otorhinolaryngologica Italica
https://www.readbyqxmd.com/read/28511594/fixation-strength-in-full-and-limited-fixation-of-osteoporotic-distal-radius-fractures
#8
P Kaveh Mansuripur, Joseph A Gil, Dale Cassidy, Patrick Kane, Augusta Kluk, Joseph J Crisco, Edward Akelman
BACKGROUND: The purpose of this investigation is to determine whether osteoporotic intra-articular distal radius fractures surgically treated by filling all 7 distal screws of a volar plate will have a higher load to failure than those treated by filling only 4 distal screws. METHODS: Ten matched pairs of fresh frozen cadaveric forearms were randomized within each pair to be treated by using either all 7 of the distal holes of a volar plate or only 4 distal screws...
May 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28508893/south-american-plate-advance-and-forced-andean-trench-retreat-as-drivers-for-transient-flat-subduction-episodes
#9
Gerben Schepers, Douwe J J van Hinsbergen, Wim Spakman, Martha E Kosters, Lydian M Boschman, Nadine McQuarrie
At two trench segments below the Andes, the Nazca Plate is subducting sub-horizontally over ∼200-300 km, thought to result from a combination of buoyant oceanic-plateau subduction and hydrodynamic mantle-wedge suction. Whether the actual conditions for both processes to work in concert existed is uncertain. Here we infer from a tectonic reconstruction of the Andes constructed in a mantle reference frame that the Nazca slab has retreated at ∼2 cm per year since ∼50 Ma. In the flat slab portions, no rollback has occurred since their formation at ∼12 Ma, generating 'horse-shoe' slab geometries...
May 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/28506232/rp58-and-p27-kip1-coordinate-cell-cycle-exit-and-neuronal-migration-within-the-embryonic-mouse-cerebral-cortex
#10
Olivier Clément, Isabel Anne Hemming, Ivan Enghian Gladwyn-Ng, Zhengdong Qu, Shan Shan Li, Michael Piper, Julian Ik-Tsen Heng
BACKGROUND: During the development of the mammalian cerebral cortex, newborn postmitotic projection neurons are born from local neural stem cells and must undergo radial migration so as to position themselves appropriately to form functional neural circuits. The zinc finger transcriptional repressor Rp58 (also known as Znf238 or Zbtb18) is critical for coordinating corticogenesis, but its underlying molecular mechanism remains to be better characterised. FINDINGS: Here, we demonstrate that the co-expression of Rp58 and the cyclin dependent kinase inhibitor (CDKI) p27(kip1) is important for E14...
May 15, 2017: Neural Development
https://www.readbyqxmd.com/read/28504823/centrifugal-driven-reduced-dimension-planar-chromatography
#11
Rachel B Strickhouser, Nahla A Hatab, Nickolay V Lavrik, Michael J Sepaniak
A fundamental problem with efficiency in capillary action driven planar chromatography results from diminishing flow rates as development proceeds, giving rise to molecular diffusion related band dispersion for most sample types. Overpressure and electrokinetic means to speed flow have been used successfully in TLC. We explore the use of centrifugal force (CF) to drive flow for reduced-dimension planar platforms (ultra-TLC, low μm features, and nano-TLC, nanoscale features). The silicon wafer platforms have two forms of continuous 2-D arrays created by either photolithography or metal dewetting followed by deep reactive ion etching and coated with porous SiO2 ...
May 15, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28503802/electrospun-polyethersolfone-nanofibrous-membrane-as-novel-platform-for-protein-immobilization-in-microfluidic-systems
#12
Matin Mahmoudifard, Manouchehr Vossoughi, Sara Soudi, Masoud Soleimani
In the present study, the feasibility of electrospun polyethersolfone (PES) nanofibrous membrane as the solid substrate for microfluidic based immunoassays to enhance the density of immobilized antibody on the surface of membrane was assessed. Conversely, the efficacy of antibody immobilization was compared by two different strategies as 1-Ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC)/N-Hydroxysuccinimide (NHS) coupling chemistry and hydrophobic interaction. Compared to conventional immunoassays carried out in plates or gels, microfluidic based immunoassays grant a lot of advantages such as a consumption of little samples and reagents, shorter analysis time, and higher efficiency...
May 15, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28501605/the-role-of-multilayers-in-preventing-the-premature-buckling-of-the-pulmonary-surfactant
#13
Mustafa Al-Saiedy, Ali Tarokh, Sultan Nelson, Kiavash Hossini, Francis Green, Chang-Chun Ling, Elmar J Prenner, Matthias Amrein
The pulmonary surfactant is a protein-lipid mixture that spreads into a film at the air-lung interface. The highly-compacted molecules of the film keep the interface from shrinking under the influence of otherwise high surface tension and thus prevent atelectasis. We have previously shown that for the film to withstand a high film pressure without collapsing it needs to assume a specific architecture of a molecular monolayer with islands of stacks of molecular multilayers scattered over the area. Surface activity was assessed in a captive bubble surfactometer (CBS) and the role of cholesterol and oxidation on surfactant function examined...
May 10, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28494572/sers-detection-of-biomolecules-by-highly-sensitive-and-reproducible-raman-enhancing-nanoparticle-array
#14
Tzu-Yi Chan, Ting-Yu Liu, Kuan-Syun Wang, Kun-Tong Tsai, Zhi-Xin Chen, Yu-Chi Chang, Yi-Qun Tseng, Chih-Hao Wang, Juen-Kai Wang, Yuh-Lin Wang
This paper describes the preparation of nanoarrays composed of silver nanoparticles (AgNPs: 20-50 nm) for use as surface-enhanced Raman scattering (SERS) substrates. The AgNPs were grown on porous anodic aluminum oxide (AAO) templates by electrochemical plating, and the inter-channel gap of AAO channels is between 10 and 20 nm. The size and interparticle gap of silver particles were adjusted in order to achieve optimal SERS signals and characterized by scanning electron microscopy, atomic force microscopy, and Raman spectroscopy...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28491477/the-effect-of-diabetic-peripheral-neuropathy-on-ground-reaction-forces-during-straight-walking-in-stroke-survivors
#15
Amirah Mustapa, Maria Justine, Nadia Mohd Mustafah, Haidzir Manaf
Purpose. The aim of this present study was to investigate the ground reaction forces (GRFs) alterations in stroke survivors with diabetic peripheral neuropathy (DPN). Methods. Ten stroke survivors with DPN, 10 stroke survivors without DPN, and 10 healthy controls with matched body weight between groups participated in this case-control cross-sectional study. Three-dimensional GRFs (anterior-posterior, medial-lateral, and vertical) were collected at a comfortable walking speed using the Nexus Vicon motion analysis system and force plate...
2017: Rehabilitation Research and Practice
https://www.readbyqxmd.com/read/28491029/sample-entropy-univariate-and-multivariate-multi-scale-entropy-in-comparison-with-classical-postural-sway-parameters-in-young-healthy-adults
#16
Clint Hansen, Qin Wei, Jiann-Shing Shieh, Paul Fourcade, Brice Isableu, Lina Majed
The present study aimed to compare various entropy measures to assess the dynamics and complexity of center of pressure (COP) displacements. Perturbing balance tests are often used in healthy subjects to imitate either pathological conditions or to test the sensitivity of postural analysis techniques. Eleven healthy adult subjects were asked to stand in normal stance in three experimental conditions while the visuo-kinesthetic input was altered. COP displacement was recorded using a force plate. Three entropy measures [Sample Entropy (SE), Multi-Scale Entropy (MSE), and Multivariate Multi Scale Entropy (MMSE)] describing COP regularity at different scales were compared to traditional measures of COP variability...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28486578/development-of-a-validated-comparative-stability-indicating-assay-method-for-some-h2-receptor-antagonists
#17
Sameh Ahmed, Salwa R Elshaboury, Niveen A Mohamed, Shereen Farrag
A comparative force degradation high performance thin layer chromatography (HPTLC) method was developed and validated for some H2-receptor antagonists. The studied H2-receptor antagonists were ranitidine (RAN), nizatidine (NIZ) and famotidine (FAM). The degradation behaviors of the studied H2-receptor antagonists were studied under different stress conditions (hydrolytic, thermal and oxidative) conditions as well as storage conditions according to International Conference on Harmonization (ICH) recommendations...
May 9, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28486333/the-relationship-between-the-push-off-ground-reaction-force-and-ball-speed-in-high-school-baseball-pitchers
#18
Sakiko Oyama, Joseph B Myers
Baseball pitching is a sequential movement that requires transfer of momentum from the lower extremity to the throwing arm. Therefore, the ground reaction force (GRF) during push off is suggested to play a roll in production of ball speed. The purpose of this study was to investigate the correlation between GRF characteristics during push off and ball speed in high school baseball pitchers. A total of 52 pitchers performed fast pitches from an indoor pitching mound. A force plate embedded in an indoor mound was used to capture the push off GRF...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28484411/age-related-interference-between-the-selection-of-input-output-modality-mappings-and-postural-control-a-pilot-study
#19
Christine Stelzel, Gesche Schauenburg, Michael A Rapp, Stephan Heinzel, Urs Granacher
Age-related decline in executive functions and postural control due to degenerative processes in the central nervous system have been related to increased fall-risk in old age. Many studies have shown cognitive-postural dual-task interference in old adults, but research on the role of specific executive functions in this context has just begun. In this study, we addressed the question whether postural control is impaired depending on the coordination of concurrent response-selection processes related to the compatibility of input and output modality mappings as compared to impairments related to working-memory load in the comparison of cognitive dual and single tasks...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28484335/coupling-strength-assumption-in-statistical-energy-analysis
#20
T Lafont, N Totaro, A Le Bot
This paper is a discussion of the hypothesis of weak coupling in statistical energy analysis (SEA). The examples of coupled oscillators and statistical ensembles of coupled plates excited by broadband random forces are discussed. In each case, a reference calculation is compared with the SEA calculation. First, it is shown that the main SEA relation, the coupling power proportionality, is always valid for two oscillators irrespective of the coupling strength. But the case of three subsystems, consisting of oscillators or ensembles of plates, indicates that the coupling power proportionality fails when the coupling is strong...
April 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
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