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https://www.readbyqxmd.com/read/28923547/how-oral-environment-simulation-affects-ceramic-failure-behavior
#1
Ediléia Lodi, Kátia R Weber, Paula Benetti, Pedro H Corazza, Álvaro Della Bona, Márcia Borba
STATEMENT OF PROBLEM: Investigating the mechanical behavior of ceramics in a clinically simulated scenario contributes to the development of new and tougher materials, improving the clinical performance of restorations. The optimal in vitro environment for testing is unclear. PURPOSE: The purpose of this in vitro study was to investigate the failure behavior of a leucite-reinforced glass-ceramic under compression loading and fatigue in different simulated oral environment conditions...
September 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28919487/effect-of-ultrasound-treatment-conditions-on-saccharomyces-cerevisiae-by-response-surface-methodology
#2
Junyan Liu, Lin Li, Lizhen Zhou, Bing Li, Zhenbo Xu
OBJECTIVES: This study aimed to investigate the effect of different ultrasound treatment conditions on the inactivation of Saccharomyces cerevisiae with the application of response surface methodology (RSM). METHODS: Ultrasound treatment were applied on different concentrations of S. cerevisiae cells with different pH, temperature, ultrasound power, irradiating time, and pulse duty ratio. Cell viability was determined by plate counting method. Response surface methodology was used to analysis the correlation among various factors...
September 15, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28904227/peptide-probes-detect-misfolded-transthyretin-oligomers-in-plasma-of-hereditary-amyloidosis-patients
#3
Joseph D Schonhoft, Cecilia Monteiro, Lars Plate, Yvonne S Eisele, John M Kelly, Daniel Boland, Christopher G Parker, Benjamin F Cravatt, Sergio Teruya, Stephen Helmke, Mathew Maurer, John Berk, Yoshiki Sekijima, Marta Novais, Teresa Coelho, Evan T Powers, Jeffery W Kelly
Increasing evidence supports the hypothesis that soluble misfolded protein assemblies contribute to the degeneration of postmitotic tissue in amyloid diseases. However, there is a dearth of reliable nonantibody-based probes for selectively detecting oligomeric aggregate structures circulating in plasma or deposited in tissues, making it difficult to scrutinize this hypothesis in patients. Hence, understanding the structure-proteotoxicity relationships driving amyloid diseases remains challenging, hampering the development of early diagnostic and novel treatment strategies...
September 13, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28869627/somatotype-variables-related-to-strength-and-power-output-in-male-basketball-players
#4
Krzysztof Buśko, Anna Pastuszak, Monika Lipińska, Marta Lipińska, Karol Gryko
PURPOSE: The purpose of this study was to investigate the relationship between somatotype, muscular strength, power output measured in maximal cycle ergometer exercise bouts, and maximal power output and height of rise of the body mass centre (jump height) measured in akimbo counter movement jump (ACMJ), counter movement jump (CMJ) and spike jump (SPJ), in male basketball players. METHODS: Thirteen male basketball players (second division, age 19.4 ± 0.8 years, body height 192...
2017: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/28863674/new-laser-power-sensor-using-diamagnetic-levitation
#5
P Pinot, Z Silvestri
This paper presents a preliminary study of an elementary device consisting of a small plate made from pyrolytic carbon levitated above a magnet array which is sensitive to any irradiating laser power. This device might provide an interesting alternative to power meters based on thermal measurement techniques via the Stefan-Boltzmann law or the photon-electron interaction. We show that the photo-response of a pyrolytic carbon plate in terms of levitation height versus irradiation power in the range of 20 mW to 1 W is sufficiently linear, sensitive, and reproducible to be used as a laser power sensor...
August 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28851530/van-de-graaff-generator-for-capillary-electrophoresis
#6
Seung Jae Lee, Eric R Castro, Rosanne M Guijt, Mark D Tarn, Andreas Manz
A new approach for high voltage capillary electrophoresis (CE) is proposed, which replaces the standard high voltage power supply with a Van de Graaff generator, a low current power source. Because the Van de Graaff generator is a current-limited source (10μA), potentials exceeding 100kV can be generated for CE when the electrical resistance of the capillary is maximized. This was achieved by decreasing the capillary diameter and reducing the buffer ionic strength. Using 2mM borate buffer and a 5μm i.d. capillary, fluorescently labeled amino acids were separated with efficiencies up to 3...
August 12, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28836084/effect-of-ultrasonic-irradiation-on-bacterial-biofilms
#7
Harumi Koibuchi, Yasutomo Fujii, Yoshikazu Hirai, Takashi Mochizuki, Kohji Masuda, Kazuhiko Kotani, Toshiyuki Yamada, Nobuyuki Taniguchi
PURPOSE: The purpose of this study was to clarify the effect of ultrasonic irradiation on biofilm produced by Staphylococcus epidermidis (S. epidermidis), which causes central venous catheter-related infections. MATERIALS AND METHODS: Staphylococcus epidermidis (S. epidermidis, ATCC 35984 RP 62A) was used in this study. First, biofilm was prepared from S. epidermidis on the bottom of the upper left well of a 6-well plate. Next, the biofilm was irradiated for 24 h with 1-MHz ultrasound (US) in the continuous wave mode to serve as the US irradiation group...
August 23, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/28827238/making-a-balanced-plate-for-pregnant-women-to-improve-birthweight-of-infants-a-study-protocol-for-a-cluster-randomised-controlled-trial-in-rural-bangladesh
#8
Morseda Chowdhury, Camille Raynes-Greenow, Ashraful Alam, Michael J Dibley
OBJECTIVES: Low birthweight significantly contributes to neonatal mortality, morbidities and psychosocial debilities throughout the course of life. A large proportion of infants (36-55%) in Bangladesh is born with low birthweight. Nutritional status of women during pregnancy is critical for optimal growth and development of the fetus. Nutrition education has been found to improve maternal nutritional status. Our study aims to determine whether nutrition education with a practical demonstration during pregnancy is an effective intervention for improving the birthweight of infants compared with standard nutrition education only...
August 21, 2017: BMJ Open
https://www.readbyqxmd.com/read/28827207/effect-of-modified-otago-exercises-on-postural-balance-fear-of-falling-and-fall-risk-in-older-fallers-with-knee-osteoarthritis-and-impaired-gait-and-balance-a-secondary-analysis
#9
Sumaiyah Mat, Chin Teck Ng, Pey June Tan, Norlisah Ramli, Farhana Fadzli, Faizatul Izza Rozalli, Mazlina Mazlan, Keith D Hill, Maw Pin Tan
BACKGROUND: Osteoarthritis (OA) is considered an established risk factor for falls. Published studies evaluating secondary falls prevention strategies among OA sufferers are limited. OBJECTIVE: To evaluate the effect of a personalized home-based exercise program to improve postural balance, fear of falling and falls risk in older fallers with knee OA and gait and balance problems. DESIGN: Randomized controlled trial SETTING: University of Malaya Medical Centre PARTICIPANT: Fallers who had both radiological OA and a Timed Up and Go (TUG) score of over 13...
August 18, 2017: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/28816865/liquid-crystal-spatial-light-modulators-for-simulating-zonal-multifocal-lenses
#10
Yiyu Li, Arthur Bradley, Renfeng Xu, Pete S Kollbaum
SIGNIFICANCE: To maximize efficiency of the normally lengthy and costly multizone lens design and testing process, it is advantageous to evaluate the potential efficacy of a design as thoroughly as possible prior to lens fabrication and on-eye testing. The current work describes an ex vivo approach of optical design testing. PURPOSE: The aim of this study was to describe a system capable of examining the optical characteristics of multizone bifocal and multifocal optics by subaperture stitching using liquid crystal technologies...
September 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28809682/an-optimization-and-comparative-study-of-air-coupled-cmut-cells-with-circular-and-annular-geometries
#11
Shuai Na, Zhenhao Li, Lawrence L P Wong, Albert I-H Chen, Mirek Macecek, John T W Yeow
Air-coupled capacitive micromachined ultrasonic transducers (CMUTs) with annular cell geometry have recently been reported to have a promising transmit sensitivity. This paper reports three optimization schemes, which further improve the transmit sensitivity and also help achieve a reasonable comparison between the novel annular and conventional circular cells. Lumped element models of both cell types with laminate plate structures are presented. Based on these models, a design optimization flow chart was constructed to facilitate analytical optimization on the three schemes...
August 14, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28808628/distal-radius-volar-rim-plate-technical-and-radiographic-considerations
#12
Michelle Spiteri, Darren Roberts, Wayne Ng, Jamie Matthews, Dominic Power
AIM: To determine technical considerations and radiographic outcomes of the Synthes volar rim distal radius plate to treat complex intra-articular fractures. METHODS: This review highlights technical considerations learnt using this implant since it was introduced in a major trauma unit in November 2011, including anatomical reduction and whether this was maintained radiographically. RESULTS: Twenty-six of the 382 internally fixed distal radial fractures at our unit (6...
July 18, 2017: World Journal of Orthopedics
https://www.readbyqxmd.com/read/28804141/a-capacitive-ultrasonic-transducer-based-on-parametric-resonance
#13
Sushruta Surappa, Sarp Satir, F Levent Degertekin
A capacitive ultrasonic transducer based on a parametric resonator structure is described and experimentally demonstrated. The transducer structure, which we call capacitive parametric ultrasonic transducer (CPUT), uses a parallel plate capacitor with a movable membrane as part of a degenerate parametric series RLC resonator circuit with a resonance frequency of fo. When the capacitor plate is driven with an incident harmonic ultrasonic wave at the pump frequency of 2fo with sufficient amplitude, the RLC circuit becomes unstable and ultrasonic energy can be efficiently converted to an electrical signal at fo frequency in the RLC circuit...
July 24, 2017: Applied Physics Letters
https://www.readbyqxmd.com/read/28804046/power-training-using-pneumatic-machines-vs-plate-loaded-machines-to-improve-muscle-power-in-older-adults
#14
Anoop T Balachandran, Kristine Gandia, Kevin A Jacobs, David L Streiner, Moataz Eltoukhy, Joseph F Signorile
OBJECTIVES: Power training has been shown to be more effective than conventional resistance training for improving physical function in older adults; however, most trials have used pneumatic machines during training. Considering that the general public typically has access to plate-loaded machines, the effectiveness and safety of power training using plate-loaded machines compared to pneumatic machines is an important consideration. The purpose of this investigation was to compare the effects of high-velocity training using pneumatic machines (Pn) versus standard plate-loaded machines (PL)...
August 10, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28801112/clinical-efficacies-of-coracoclavicular-ligament-reconstruction-using-suture-anchor-versus-hook-plate-in-the-treatment-of-distal-clavicle-fracture
#15
H W Yan, L Li, R C Wang, Y Yang, Y Xie, J Tang, Z Y Shi
INTRODUCTION: Comparison of clinical efficacies between coracoclavicular ligament reconstruction using autologous gracilis tendon with suture anchor and clavicular hook plate for the treatment of acute Neer type II distal clavicle fracture. HYPOTHESIS: Both coracoclavicular reconstruction with autologous gracilis tendon and clavicular hook plate could achieve satisfactory results for treating acute Neer type II distal clavicle fracture. METHODS: Acute Neer type II distal clavicle fracture patients enrolled in this prospective randomized study were divided into the coracoclavicular ligament reconstruction group (using autologous gracilis tendon and suture anchor) and the hook plate group...
August 8, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28799810/acute-effects-of-whole-body-vibration-on-balance-in-persons-with-and-without-chronic-ankle-instability
#16
Nicole K Rendos, Hyung-Pil Jun, Nancy M Pickett, Karen Lew Feirman, Kysha Harriell, Sae Yong Lee, Joseph F Signorile
Chronic ankle instability (CAI) is a common condition following ankle injury that is associated with compromised balance. Whole body vibration training (WBVT) programmes are linked with improved balance and function in athletic and non-athletic populations and may improve balance in CAI. Twelve healthy and seven CAI participants completed two randomly assigned interventions. Two Power Plate® platforms were attached back to back using a Theraband®. Participants stood on the active plate and inactive plate for WBVT and sham interventions, respectively...
August 11, 2017: Research in Sports Medicine
https://www.readbyqxmd.com/read/28797116/calcium-imaging-with-genetically-encoded-sensor-case12-facile-analysis-of-%C3%AE-7-%C3%AE-9-nachr-mutants
#17
Irina Shelukhina, Ekaterina Spirova, Denis Kudryavtsev, Lucy Ojomoko, Markus Werner, Christoph Methfessel, Michael Hollmann, Victor Tsetlin
Elucidation of the structural basis of pharmacological differences for highly homologous α7 and α9 nicotinic acetylcholine receptors (nAChRs) may shed light on their involvement in different physiological functions and diseases. Combination of site-directed mutagenesis and electrophysiology is a powerful tool to pinpoint the key amino-acid residues in the receptor ligand-binding site, but for α7 and α9 nAChRs it is complicated by their poor expression and fast desensitization. Here, we probed the ligand-binding properties of α7/α9 nAChR mutants by a proposed simple and fast calcium imaging method...
2017: PloS One
https://www.readbyqxmd.com/read/28795887/cold-atmospheric-pressure-plasmas-exhibit-antimicrobial-properties-against-critical-bacteria-and-yeast-species
#18
C Wiegand, S Fink, U-C Hipler, O Beier, K Horn, A Pfuch, A Schimanski, B Grünler
OBJECTIVE: Cold atmospheric pressure plasmas (CAPPs) have been used to sterilise implant materials and other thermally unstable medical products and to modify chemical surfaces. This study investigates the antimicrobial effect of the gas and input power used to generate CAPPs on microorganisms causing skin infections, such as Staphylococcus aureus, Pseudomonas aeruginosa, Candida albicans and Malassezia pachydermatis. METHOD: Microorganisms were cultivated on Mueller Hinton 2 (MH2) agar plates...
August 2, 2017: Journal of Wound Care
https://www.readbyqxmd.com/read/28791454/-midcarpal-partial-arthrodesis-with-locking-plate-osteosynthesis
#19
REVIEW
J-F Hernekamp, U Kneser, T Kremer, B Bickert
OBJECTIVE: Preservation of residual mobility and pain reduction in the wrist in advanced carpal collapse (scapholunate advanced collapse, SLAC or scaphoid nonunion advanced collapse, SNAC). INDICATIONS: Advanced osteoarthritis of the radiocarpal and intercarpal articulations, SLAC/SNAC stages 2-3. CONTRAINDICATIONS: Arthrotic alterations to the proximal joint surface of the lunate bone or the corresponding joint surface of the radius (lunate fossa)...
August 8, 2017: Operative Orthopädie und Traumatologie
https://www.readbyqxmd.com/read/28789591/microwave-assisted-extraction-and-pharmacological-evaluation-of-polysaccharides-from-posidonia-oceanica
#20
Yosra Ben Salem, Amal Abdelhamid, Khaoula Mkadmini Hammi, Didier Le Cerf, Abderrahman Bouraoui, Hatem Majdoub
Microwave-assisted extraction was employed for the isolation of polysaccharides from Posidonia oceanica (PPO). The extracting parameters were optimized adopting response surface methodology. The highest polysaccharide yield (2.55 ± 0.09%), which is in concordance with the predicted value (2.76%), was obtained under the following conditions: extraction time 60 s, liquid-solid ratio of 50:1 (mL/g) and power of 800 W. This polysaccharide, with molecular weight of 524 KDa, characterized by gas chromatography-mass spectrometry showed that PPO was mainly composed of galactose, glucose, and arabinose with molar percentages 25...
August 9, 2017: Bioscience, Biotechnology, and Biochemistry
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