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https://www.readbyqxmd.com/read/28735949/hip-flexor-muscle-dysfunction-during-walking-at-self-selected-and-fast-speed-in-patients-with-aortoiliac-peripheral-arterial-disease
#1
Takaaki Kakihana, Osamu Ito, Yusuke Sekiguchi, Daisuke Ito, Hitoshi Goto, Daijirou Akamatsu, Yasuharu Matsumoto, Masahiro Kohzuki
OBJECTIVE: Intermittent claudication aggravates physical function and is associated with an increased risk of death in patients with peripheral arterial disease (PAD). Previous studies on kinetic parameters (joint moment and power) of lower limbs in these patients have largely focused on the decline in the ankle plantar flexor moment and power at self-selected (SS) walking speed, which may not be an optimal condition to induce claudication pain. In the present study, we investigated the abnormalities in joint kinetic parameters in patients with PAD at both SS and at fast walking speeds...
August 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28734544/lower-limb-joint-work-and-joint-work-contribution-during-downhill-and-uphill-walking-at-different-inclinations
#2
Nathalie Alexander, Gerda Strutzenberger, Lisa Maria Ameshofer, Hermann Schwameder
Work performance and individual joint contribution to total work are important information for creating training protocols, but were not assessed so far for sloped walking. Therefore, the purpose of this study was to analyze lower limb joint work and joint contribution of the hip, knee and ankle to total lower limb work during sloped walking in a healthy population. Eighteen male participants (27.0±4.7yrs, 1.80±0.05m, 74.5±8.2kg) walked on an instrumented ramp at inclination angles of 0°, ±6°, ±12° and ±18° at 1...
July 11, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28732945/heat-transfer-enhancement-using-2mhz-ultrasound
#3
Odin Bulliard-Sauret, Sebastien Ferrouillat, Laure Vignal, Alain Memponteil, Nicolas Gondrexon
The present work focuses on possible heat transfer enhancement from a heating plate towards tap water in forced convection by means of 2MHz ultrasound. The thermal approach allows to observe the increase of local convective heat transfer coefficients in the presence of ultrasound and to deduce a correlation between ultrasound power and Nusselt number. Heat transfer coefficient under ultrasound remains constant while heat transfer coefficient under silent conditions increases with Reynolds number from 900 up to 5000...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28726908/mn-4-li-co-doped-srmgal10o17-phosphor-in-glass-application-in-high-power-warm-w-leds
#4
Jiasong Zhong, Wei Xu, Qingli Chen, Shuo Yuan, Zhengguo Ji, Daqin Chen
Currently, the shortage of red components and easy aging of organic silicone still remain challenges for high-power phosphor-converted warm white light-emitting diodes (w-LEDs). Aiming to alleviate these issues, phosphor-in-glass (PiG), fabricated by co-sintering red- and yellow-emitting phosphors and low-melting glass, has been regarded as a promising color converter for w-LEDs. In this study, a Li(+),Mn(4+) co-doped SrMgAl10O17 red phosphor was synthesized via a conventional solid-state reaction. The as-prepared phosphor exhibits a deep red emission, ascribed to Mn(4+):(2)Eg → (4)A2g spin-forbidden transition in the range of 600-700 nm with a narrow-band full width at half maximum of 55 nm, and provides an ideal broadband excitation extending from 250 to 530 nm...
July 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28720867/graphene-microfiber-as-a-scaffold-for-regulation-of-neural-stem-cells-differentiation
#5
Weibo Guo, Jichuan Qiu, Jingquan Liu, Hong Liu
We report the cytocompatibility and regulating effects of the nanostructured reduced graphene oxide (rGO) microfibers, which are synthesized through a capillary hydrothermal method, on neural differentiation of neural stem cells (NSCs). Our findings indicate that the flexible, mechanically strong, surface nanoporous, biodegradable, and cytocompatible nanostructured rGO microfibers not only offer a more powerful substrate for NSCs adhesion and proliferation compared with 2D graphene film and tissue cluture plate but also regulate the NSCs differentiation into neurons and form a dense neural network surrounding the microfiber...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28720731/an-in-vitro-chicken-gut-model-demonstrates-transfer-of-a-multidrug-resistance-plasmid-from-salmonella-to-commensal-escherichia-coli
#6
Roderick M Card, Shaun A Cawthraw, Javier Nunez-Garcia, Richard J Ellis, Gemma Kay, Mark J Pallen, Martin J Woodward, Muna F Anjum
The chicken gastrointestinal tract is richly populated by commensal bacteria that fulfill various beneficial roles for the host, including helping to resist colonization by pathogens. It can also facilitate the conjugative transfer of multidrug resistance (MDR) plasmids between commensal and pathogenic bacteria which is a significant public and animal health concern as it may affect our ability to treat bacterial infections. We used an in vitro chemostat system to approximate the chicken cecal microbiota, simulate colonization by an MDR Salmonella pathogen, and examine the dynamics of transfer of its MDR plasmid harboring several genes, including the extended-spectrum beta-lactamase blaCTX-M1 We also evaluated the impact of cefotaxime administration on plasmid transfer and microbial diversity...
July 18, 2017: MBio
https://www.readbyqxmd.com/read/28720224/development-of-a-1-0-mm-id-temperature-assisted-focusing-precolumn-for-use-with-2-1-mm-id-columns
#7
Stephen R Groskreutz, Anthony R Horner, Stephen G Weber
On-column solute focusing is a simple and powerful method to decrease the influence of precolumn band spreading and increase the allowable volume injected increasing sensitivity. It relies on creating conditions so that the retention factor, k', is transiently increased during the injection process. Both solvent composition and temperature control can be used to effect solute focusing. In the case of temperature, the release of the transiently delayed solute band requires increasing the temperature rapidly and with a minimum of radial thermal gradients...
July 8, 2017: Journal of Chromatography. A
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
#8
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/28701791/multi-photon-absorption-enhancement-by-dual-wavelength-double-pulse-laser-irradiation-for-efficient-dicing-of-sapphire-wafers
#9
Mindaugas Gedvilas, Justinas Mikšys, Jonas Berzinš, Valdemar Stankevič, Gediminas Račiukaitis
The evidence of multi-photon absorption enhancement by the dual-wavelength double-pulse laser irradiation in transparent sapphire was demonstrated experimentally and explained theoretically for the first time. Two collinearly combined laser beams with the wavelengths of 1064 nm and 355 nm, inter-pulse delay of 0.1 ns, and pulse duration of 10 ps were used to induce intra-volume modifications in sapphire. The theoretical prediction of using a particular orientation angle of 15 degrees of the half-wave plate for the most efficient absorption of laser irradiation is in good agreement with the experimental data...
July 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28692933/contrast-enhancement-of-nanomaterials-using-phase-plate-stem
#10
Hiroki Minoda, Takayuki Tamai, Yuya Ohmori, Hirofumi Iijima
Visualizing materials composed of light elements is difficult, and the development of an imaging method that enhances the phase contrast of such materials has been of much interest. In this study, we demonstrate phase-plate scanning transmission electron microscopy (P-STEM), which we developed recently, and its application to nanomaterials. An amorphous carbon film with a small hole in its center was used to control the phase of incident electron waves, and the phase-contrast transfer function (PCTF) was modified from sine-type to cosine-type...
July 4, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28690460/analysis-of-player-statistics-in-major-league-baseball-players-before-and-after-achilles-tendon-repair
#11
Bryan M Saltzman, Matthew W Tetreault, Daniel D Bohl, Danielle Tetreault, Simon Lee, Bernard R Bach
BACKGROUND: No currently available literature evaluates the effect of Achilles tendon repair on professional baseball players in the Major League Baseball (MLB). QUESTIONS/PURPOSES: The purpose of this study was to determine the impact of Achilles tendon rupture and repair on MLB players in terms of return to play and batting/fielding performance metrics. METHODS: Achilles tendon rupture data were retrospectively collected using information from the MLB disabled list, injury reports, MLB game summaries, player profiles, and publicly available news articles...
July 2017: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
https://www.readbyqxmd.com/read/28685862/sprint-mechanics-evaluation-using-inertial-sensor-based-technology-a-laboratory-validation-study
#12
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/28679720/immunoassays
#13
Thomas O Kohl, Carl A Ascoli
The enzyme immunoassay (EIA) is one of the most powerful of all immunochemical techniques. First described in the early 1970s, these assays are now used routinely in laboratory analyses and diagnostics. In biology and biotechnology, the EIA is a valuable and versatile tool used to detect and quantitate antigens and antibodies. Application of the appropriate EIA permits rapid quantification of different antigens and antibodies (referred to here as analytes) present at very low concentrations within a mixture...
July 5, 2017: Cold Spring Harbor Protocols
https://www.readbyqxmd.com/read/28669688/effect-of-an-upstream-bulge-configuration-on-film-cooling-with-and-without-mist-injection
#14
Jin Wang, Qianqian Li, Bengt Sundén, Ting Ma, Pei Cui
To meet the economic requirements of power output, the increased inlet temperature of modern gas turbines is above the melting point of the material. Therefore, high-efficient cooling technology is needed to protect the blades from the hot mainstream. In this study, film cooling was investigated in a simplified channel. A bulge located upstream of the film hole was numerically investigated by analysis of the film cooling effectiveness distribution downstream of the wall. The flow distribution in the plate channel is first presented...
June 29, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28669067/determining-the-optimal-dose-of-1940-nm-thulium-fiber-laser-for-assisting-the-endodontic-treatment
#15
Ayse Sena Kabas Sarp, Murat Gulsoy
Insufficient cleaning, the complex anatomy of the root canal system, inaccessible accessory canals, and inadequate penetration of irrigants through dentinal tubules minimizes the success of the conventional endodontic treatment. Laser-assisted endodontic treatment enhances the quality of conventional treatment, but each laser wavelength has its own its own limitations. The optimal parameters for the antibacterial efficiency of a new wavelength, 1940-nm Thulium Fiber Laser, were firstly investigated in this study...
July 1, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28663586/radiocarbon-as-a-novel-tracer-of-extra-antarctic-feeding-in-southern-hemisphere-humpback-whales
#16
Pascale Eisenmann, Brian Fry, Debashish Mazumder, Geraldine Jacobsen, Carlysle Sian Holyoake, Douglas Coughran, Susan Bengtson Nash
Bulk stable isotope analysis provides information regarding food web interactions, and has been applied to several cetacean species for the study of migration ecology. One limitation in bulk stable isotope analysis arises when a species, such as Southern hemisphere humpback whales, utilises geographically distinct food webs with differing isotopic baselines. Migrations to areas with different baselines can result in isotopic changes that mimic changes in feeding relations, leading to ambiguous food web interpretations...
June 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28662163/association-between-laboratory-capacities-and-world-cup-performance-in-nordic-combined
#17
Vegard Rasdal, Ronny Fudel, Jan Kocbach, Frode Moen, Gertjan Ettema, Øyvind Sandbakk
BACKGROUND: Nordic combined (NC) is an Olympic winter-sport performed as a ski jumping (SJ) event followed by a cross-country (XC) pursuit race employing the skating style. PURPOSE: To elucidate the associations between sport-specific laboratory capacities and SJ, XC skiing, and overall NC performance in a world-cup NC event. METHODS: Twelve international world-cup NC athletes from 8 nations performed laboratory testing one day prior to participating in a world-cup NC event...
2017: PloS One
https://www.readbyqxmd.com/read/28655754/the-endoplasmic-reticulum-hsp40-co-chaperone-erdj3-dnajb11-assembles-and-functions-as-a-tetramer
#18
Kai-Chun Chen, Song Qu, Saikat Chowdhury, Isabelle C Noxon, Joseph D Schonhoft, Lars Plate, Evan T Powers, Jeffery W Kelly, Gabriel C Lander, R Luke Wiseman
ERdj3/DNAJB11 is an endoplasmic reticulum (ER)-targeted HSP40 co-chaperone that performs multifaceted functions involved in coordinating ER and extracellular proteostasis. Here, we show that ERdj3 assembles into a native tetramer that is distinct from the dimeric structure observed for other HSP40 co-chaperones. An electron microscopy structural model of full-length ERdj3 shows that these tetramers are arranged as a dimer of dimers formed by distinct inter-subunit interactions involving ERdj3 domain II and domain III Targeted deletion of residues 175-190 within domain II renders ERdj3 a stable dimer that is folded and efficiently secreted from mammalian cells...
June 27, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28654968/association-of-electrochemical-therapy-with-optical-mechanical-and-acoustic-impedance-properties-of-porcine-skin
#19
Wesley J Moy, Erica Su, Jason J Chen, Connie Oh, Joe C Jing, Yueqiao Qu, Youmin He, Zhongping Chen, Brian J F Wong
Importance: The classic management of burn scars and other injuries to the skin has largely relied on soft-tissue transfer to resurface damaged tissue with local tissue transfer or skin graft placement. In situ generation of electrochemical reactions using needle electrodes and an application of current may be a new approach to treat scars and skin. Objective: To examine the changes in optical, mechanical, and acoustic impedance properties in porcine skin after electrochemical therapy...
June 22, 2017: JAMA Facial Plastic Surgery
https://www.readbyqxmd.com/read/28648328/functional-outcomes-of-thumb-trapeziometacarpal-arthrodesis-with-a-locked-plate-versus-ligament-reconstruction-and-tendon-interposition
#20
K J Hippensteel, Ryan Calfee, Agnes Z Dardas, Richard Gelberman, Daniel Osei, Lindley Wall
PURPOSE: To compare standardized functional and patient-reported early outcomes following trapeziometacarpal arthrodesis (TMA) using a locking cage plate construct with trapezial excision, ligament reconstruction, and tendon interposition (LRTI). METHODS: This prospective cohort enrolled 50 consecutive patients with trapeziometacarpal osteoarthritis undergoing TMA or LRTI. Demographic data, objective measurements, Sollerman function testing, and patient-reported outcomes were collected before surgery and at various time intervals up to 12 months after surgery...
June 22, 2017: Journal of Hand Surgery
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