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https://www.readbyqxmd.com/read/29691551/-experimental-research-of-hot-alkaline-solution-etching-treatment-on-zirconia-resin-bonding-strength
#1
Li-Yang Wan, Hong-Shui Zhu
PURPOSE: In this experiment, we applied hot alkaline solution (20%NaOH solutions) to treat the surfaces of zirconia ceramics in vitro, then evaluated the changes of bond strength of zirconia ceramics and resin cement. METHODS: Eighteen pieces of zirconia ceramic specimens were made, using the same method of grinding and polishing, and then randomly divided them into 3 groups: group A with hot alkali solution treatment (20%NaOH) (n=6), group B underwent sand blasting with a diameter of 110 ?m alumina particles (n=6), group C was as the control group...
December 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/29687012/sex-based-differences-of-medial-collateral-ligament-and-anterior-cruciate-ligament-strains-with-cadaveric-impact-simulations
#2
Nathan D Schilaty, Nathaniel A Bates, Christopher V Nagelli, Aaron J Krych, Timothy E Hewett
Background: Female patients sustain noncontact knee ligament injuries at a greater rate compared with their male counterparts. The cause of these differences in the injury rate and the movements that load the ligaments until failure are still under dispute in the literature. Purpose/Hypotheses: This study was designed to determine differences in anterior cruciate ligament (ACL) and medial collateral ligament (MCL) strains between male and female cadaveric specimens during a simulated athletic task...
April 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29686281/gauging-force-by-tapping-tendons
#3
Jack A Martin, Scott C E Brandon, Emily M Keuler, James R Hermus, Alexander C Ehlers, Daniel J Segalman, Matthew S Allen, Darryl G Thelen
Muscles are the actuators that drive human movement. However, despite many decades of work, we still cannot readily assess the forces that muscles transmit during human movement. Direct measurements of muscle-tendon loads are invasive and modeling approaches require many assumptions. Here, we introduce a non-invasive approach to assess tendon loads by tracking vibrational behavior. We first show that the speed of shear wave propagation in tendon increases with the square root of axial stress. We then introduce a remarkably simple shear wave tensiometer that uses micron-scale taps and skin-mounted accelerometers to track tendon wave speeds in vivo...
April 23, 2018: Nature Communications
https://www.readbyqxmd.com/read/29685838/shear-wave-elastography-can-predict-passive-stiffness-of-supraspinatus-musculotendinous-unit-during-arthroscopic-rotator-cuff-repair-for-presurgical-planning
#4
Yoshiaki Itoigawa, Yuichiro Maruyama, Takayuki Kawasaki, Tomoki Wada, Keiichi Yoshida, Kai-Nan An, Kazuo Kaneko
PURPOSE: To determine the feasibility of shear wave elastography (SWE) with B-mode ultrasound in predicting the stiffness of the rotator cuff muscle before arthroscopic rotator cuff repair to evaluate the difficulty of the surgical procedure, as well as to compare SWE with the Goutallier stage on magnetic resonance imaging (MRI). METHODS: Thirty-eight patients with a full-thickness supraspinatus tear requiring arthroscopic rotator cuff repair participated. The Goutallier stage of fatty infiltration on MRI was measured before surgery, as was the SWE modulus of the anterior superficial, anterior deep, posterior superficial, and posterior deep (PD) regions of the supraspinatus muscle...
April 20, 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29684842/shear-force-analysis-by-core-location-in-longissimus-steaks-from-nellore-cattle-using-hyperspectral-images-a-feasibility-study
#5
Juliana Monteiro Balage, José Manuel Amigo, Daniel Silva Antonelo, Madeline Rezende Mazon, Saulo da Luz E Silva
Industry requires non-destructive real-time methods for quality control of meat in order to improve production efficiency and meet consumer expectations. Near Infrared Hyperspectral Images were used for tenderness evaluation of Nellore beef and the construction of tenderness distribution maps. To investigate whether the selection of the region of interest (ROI) in the image at the exact location where the shear force core was collected improves tenderness prediction and classification models, 50 samples from Longissimus muscle were imaged (1000-2500 nm) and shear force were measured (Warner-Bratzler)...
April 12, 2018: Meat Science
https://www.readbyqxmd.com/read/29682864/effects-of-stocking-density-on-growth-performance-meat-quality-and-tibia-development-of-pekin-ducks
#6
Ya Ru Zhang, Lu Shuang Zhang, Zhong Wang, Yang Liu, Fu Huang Li, Jian Min Yuan, Zhao Fei Xia
This study was performed to investigate the effects of stocking density on performance, meat quality and tibia development in Pekin ducks reared on a plastic wire floor. A total of 372 healthy, 21-day-old, male ducks with similar body weight (BW) were randomly allotted to stocking densities of five (low), eight (medium) and 11 (high) birds/m2 . Each group had six replicates. Results showed that compared with the low density group, medium and high stocking density caused a decrease in final BW at 42 days old, and in average daily gain, European performance index (p < ...
April 23, 2018: Animal Science Journal, Nihon Chikusan Gakkaihō
https://www.readbyqxmd.com/read/29682335/dielectrophoresis-testing-of-nonlinear-viscoelastic-behaviors-of-human-red-blood-cells
#7
Yuhao Qiang, Jia Liu, E Du
Dielectrophoresis in microfluidics provides a useful tool to test biomechanics of living cells, regardless of surface charges on cell membranes. We have designed an experimental method to characterize the nonlinear viscoelastic behaviors of single cells using dielectrophoresis in a microfluidic channel. This method uses radio frequency, low voltage excitations through interdigitated microelectrodes, allowing probing multiple cells simultaneously with controllable load levels. Dielectrophoretic force was calibrated using a triaxial ellipsoid model...
2018: Micromachines
https://www.readbyqxmd.com/read/29680604/graphene-nanosheets-preparation-using-magnetic-nanoparticle-assisted-liquid-phase-exfoliation-of-graphite-the-coupled-effect-of-ultrasound-and-wedging-nanoparticles
#8
Alireza Hadi, Jafar Zahirifar, Javad Karimi-Sabet, Abolfazl Dastbaz
This study aims to investigate a novel technique to improve the yield of liquid phase exfoliation of graphite to graphene sheets. The method is based on the utilization of magnetic Fe3 O4 nanoparticles as "particle wedge" to facilitate delamination of graphitic layers. Strong shear forces resulted from the collision of Fe3 O4 particles with graphite particles, and intense ultrasonic waves lead to enhanced exfoliation of graphite. High quality of graphene sheets along with the ease of Fe3 O4 particle separation from graphene solution which arises from the magnetic nature of Fe3 O4 nanoparticles are the unique features of this approach...
June 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29678550/low-level-shear-stress-promotes-migration-of-liver-cancer-stem-cells-via-the-fak-erk1-2-signalling-pathway
#9
Jinghui Sun, Qing Luo, Lingling Liu, Guanbin Song
Cancer stem cells (CSCs) are a small subpopulation of tumour cells that have been proposed to be responsible for cancer initiation, chemotherapy resistance and cancer recurrence. Shear stress activated cellular signalling is involved in cellular migration, proliferation and differentiation. However, little is known about the effects of shear stress on the migration of liver cancer stem cells (LCSCs). Here, we studied the effects of shear stress that are generated from a parallel plated flow chamber system, on LCSC migration and the activation of focal adhesion kinase (FAK) and extracellular signal regulated kinase1/2 (ERK1/2), using transwell assay and western blot, respectively...
April 17, 2018: Cancer Letters
https://www.readbyqxmd.com/read/29677505/a-mechanosensitive-gpcr-that-detects-the-bloody-force
#10
Adam J Iliff, X Z Shawn Xu
Mechanoreceptors mediate a wide variety of physiological processes, such as hearing, touch, proprioception, and blood flow regulation. It is generally believed that mechanoreceptors are force-gated ion channels. Now, Xu et al. uncover a GPCR that is activated by shear force in endothelial cells of blood vessels.
April 19, 2018: Cell
https://www.readbyqxmd.com/read/29676178/afm-as-a-tool-to-evaluate-the-risk-for-cardiovascular-diseases-in-patients
#11
Ana Filipa Guedes, Luís Sargento, José Braz-Nogueira, Nuno Lousada, Carlos Moreira, Filomena A Carvalho, Nuno C Santos
Erythrocyte aggregation is an indicator of cardiovascular risk, which is influenced by plasma fibrinogen concentration. Fibrinogen levels are elevated during cardiovascular diseases. Our main goals were to understand how fibrinogen-erythrocyte binding influences erythrocyte aggregation and how it constitutes a cardiovascular risk factor in essential arterial hypertension (EAH) and chronic heart failure (CHF). Fibrinogen-erythrocyte and erythrocyte-erythrocyte adhesion measurements were conducted by atomic force microscopy (AFM)-based force spectroscopy...
2018: Annals of Medicine
https://www.readbyqxmd.com/read/29675978/measurement-of-large-strain-properties-in-calf-muscles-in-vivo-using-magnetic-resonance-elastography-and-spatial-modulation-of-magnetization
#12
Kristy Tan, Lauriane Jugé, Alice Hatt, Shaokoon Cheng, Lynne E Bilston
It is important to measure the large deformation properties of skeletal muscle in vivo in order to understand and model movement and the force-producing capabilities of muscle. As muscle properties are non-linear, an understanding of how the deformation state affects the measured shear moduli is also useful for clinical applications of magnetic resonance elastography (MRE) to muscle disorders. MRE has so far only been used to measure the linear viscoelastic (small strain) properties of muscles. This study aims to measure the shear moduli of human calf muscles under varying degrees of strain using MRE...
April 19, 2018: NMR in Biomedicine
https://www.readbyqxmd.com/read/29669069/relation-among-quality-traits-of-chicken-breast-meat-during-cold-storage-correlations-between-freshness-traits-and-torrymeter-values
#13
Joko Sujiwo, Dongwook Kim, Aera Jang
The aim of this study was to evaluate the relation among the quality and freshness traits of chicken breast meat during storage for 12 d at 4°C. In addition, correlations between freshness traits and torrymeter values were examined. The L* and a* value of the color was constant; however, the b* value increased on day 5 of storage (P < 0.05). The shear force value significantly decreased, whereas the 2-thiobarbituric acid reactive substances value significantly increased during storage. Regarding the sensory properties, the off-odor and the drip loss increased along with the decrease in color and overall acceptability evaluated by the panelist...
April 14, 2018: Poultry Science
https://www.readbyqxmd.com/read/29669056/performance-meat-quality-and-pectoral-myopathies-of-broilers-fed-either-corn-or-sorghum-based-diets-supplemented-with-guanidinoacetic-acid
#14
H A Córdova-Noboa, E O Oviedo-Rondón, A H Sarsour, J Barnes, P Ferzola, M Rademacher-Heilshorn, U Braun
One experiment was conducted to evaluate the effects of guanidinoacetic acid (GAA) supplementation in broilers fed corn or sorghum-based diets on live performance, carcass and cut up yields, meat quality, and pectoral myopathies. The treatments consisted of corn or sorghum-based diets with or without the addition of GAA (600 g/ton). A total of 800 one-d-old male Ross 708 broiler chicks were randomly placed in 40 floor pens with 10 replicates (20 birds per pen) per each of the four treatments. At hatch, 14, 35, and 50 d, BW and feed intake were recorded...
April 13, 2018: Poultry Science
https://www.readbyqxmd.com/read/29668308/ultrasound-elastography-in-diagnosis-and-follow-up-for-patients-with-sialolithiasis
#15
Christoph A Reichel, Teresa Vincek, Donata Gellrich, Florian Schrötzlmair, Dirk Clevert, Pamela Zengel
OBJECTIVE: This study aims to answer whether Acoustic Radiation Force Impulse Imaging (ARFI) can reasonably be employed in initial examination and follow-up during therapy in patients with sialolithiasis, one of the most common non-malignant disorders of the salivary glands. METHODS: Mechanical tissue properties of affected and contralateral healthy salivary glands were analyzed by ARFI in 129 patients with sialolithiasis. In different subgroup analyses, ARFI shear wave velocity values were compared between healthy and diseased submandibular or parotid glands, salivary glands with calculi exhibiting different sizes, as well as before and after therapy...
April 18, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/29667319/patterning-of-discotic-liquid-crystals-with-tunable-molecular-orientation-for-electronic-applications
#16
Cheng Zou, Jingxia Wang, Meng Wang, Yuchen Wu, Kehua Gu, Zhihao Shen, Guirong Xiong, Huai Yang, Lei Jiang, Tomiki Ikeda
The large-area formation of functional micropatterns with liquid crystals is of great significance for diversified applications in interdisciplinary fields. Meanwhile, the control of molecular alignment in the patterns is fundamental and prerequisite for the adequate exploitation of their photoelectric properties. However, it would be extremely complicated and challenging for discotic liquid crystals (DLCs) to achieve the goal, because they are insensitive to external fields and surface chemistry. Herein, a simple method of patterning and aligning DLCs on flat substrates is disclosed through precise control of the formation and dewetting of the capillary liquid bridges, within which the DLC molecules are confined...
April 18, 2018: Small
https://www.readbyqxmd.com/read/29665604/-foreign-material-free-anterior-cruciate-ligament-repair-with-hamstring-graft-felmet-technique
#17
Marc Chmielnicki, Wolfram Siebert, Axel Prokop
Rupture of the anterior cruciate ligament (ACL) is a common sports injury. Shear forces can damage the articular cartilage and lead to early osteoarthritis. Ligamentary stabilisation of the knee is necessary. Today, arthroscopic ACL repair is a standard knee procedure. Transplant fixation is often performed using implants, e.g. interference screws. The foreign material-free procedure using the Felmet technique enables biological, mechanically stable fixation of the hamstring tendon graft. We demonstrate the surgical technique, including meniscus suture and a video case study...
April 2018: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/29665185/laminar-shear-stress-modulates-endothelial-luminal-surface-stiffness-in-a-tissue-specific-manner
#18
Nick Merna, Andrew K Wong, Victor Barahona, Pierre Llanos, Balvir Kunar, Brisa Palikuqi, Michael Ginsberg, Shahin Rafii, Sina Y Rabbany
OBJECTIVE: Endothelial cells form vascular beds in all organs and are exposed to a range of mechanical forces that regulate cellular phenotype. We sought to determine the role of endothelial luminal surface stiffness in tissue-specific mechanotransduction of laminar shear stress in microvascular mouse cells and the role of arachidonic acid in mediating this response. METHODS: Microvascular mouse endothelial cells were subjected to laminar shear stress at 4 dynes/cm2 for 12 hours in parallel plate flow chambers that enabled real-time optical microscopy and atomic force microscopy measurements of cell stiffness...
April 17, 2018: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/29664090/nanoscale-coaxial-focused-electrohydrodynamic-jet-printing
#19
Dazhi Wang, Xiaojun Zhao, Yigao Lin, Junsheng Liang, Tongqun Ren, Zhenghao Liu, Jiangyu Li
Controlled patterning of nanostructures at desired positions is of great importance for high-performance M/NEMS devices. Here, we demonstrate a high-resolution, high-speed and cost-effective fabrication method, named coaxial focused electrohydrodynamic jet printing, to print functional nanostructures. A coaxial needle was designed and developed; a functional ink and high viscosity liquid are applied in the inner and outer needle, respectively. Under optimised conditions, a stable coaxial jet is formed; then, the electrical shearing force and electrical field induce viscous shearing force and internal pressure that are jointly applied on the inner functional ink, focusing the inner jet on the nanoscale...
April 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29662047/mechanisms-and-fem-simulation-of-chip-formation-in-orthogonal-cutting-in-situ-tib%C3%A2-7050al-mmc
#20
Yifeng Xiong, Wenhu Wang, Ruisong Jiang, Kunyang Lin, Mingwei Shao
The in-situ TiB₂/7050Al composite is a new kind of Al-based metal matrix composite (MMC) with super properties, such as low density, improved strength, and wear resistance. This paper, for a deep insight into its cutting performance, involves a study of the chip formation process and finite element simulation during orthogonal cutting in-situ TiB₂/7050Al MMC. With chips, material properties, cutting forces, and tool geometry parameters, the Johnson-Cook (J-C) constitutive equation of in-situ TiB₂/7050Al composite was established...
April 15, 2018: Materials
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