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https://www.readbyqxmd.com/read/28734257/comparison-of-femoropopliteal-artery-stents-under-axial-and-radial-compression-axial-tension-bending-and-torsion-deformations
#1
Kaspars Maleckis, Paul Deegan, William Poulson, Cole Sievers, Anastasia Desyatova, Jason MacTaggart, Alexey Kamenskiy
High failure rates of Peripheral Arterial Disease (PAD) stenting appear to be associated with the inability of certain stent designs to accommodate severe biomechanical environment of the femoropopliteal artery (FPA) that bends, twists, and axially compresses during limb flexion. Twelve Nitinol stents (Absolute Pro, Supera, Lifestent, Innova, Zilver, Smart Control, Smart Flex, EverFlex, Viabahn, Tigris, Misago, and Complete SE) were quasi-statically tested under bench-top axial and radial compression, axial tension, bending, and torsional deformations...
July 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28734242/environmental-estrogen-s-induced-swimming-behavioural-alterations-in-adult-zebrafish-danio-rerio
#2
Basavaraj B Goundadkar, Pancharatna Katti
The present study is an attempt to investigate the effects of long-term (75days) exposure to environmental estrogens (EE) on the swimming behaviour of zebrafish (Danio rerio). Adult zebrafish were exposed semi-statically to media containing commonly detected estrogenic water contaminants (EE2, DES and BPA) at a concentration (5ng/L) much lower than environmentally recorded levels. Time spent in swimming, surface preference, patterns and path of swimming were recorded (6mins) for each fish using two video cameras on day 15, 30 60 and 75...
July 11, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28734219/acute-toxicity-of-cadmium-in-anisops-sardeus-heteroptera-notonectidae-effects-on-adult-and-nymphal-survival-and-swimming-behavior
#3
Chongtham Memtombi Chanu, Susmita Gupta, Abhik Gupta
Adult female and male, and final instar nymph of Anisops sardeus (Heteroptera: Notonectidae) were exposed to graded concentrations of cadmium in 96h static-with-renewal acute toxicity tests, which were conducted in dry (March) and wet (May-June) seasons. The 96h LC50 values for instar V nymph, adult female and male were found to be 0.9, 0.59 and 0.51mgL(-1) Cd, respectively, in wet season, while these were 26.7 and 20.2mgL(-1) Cd for adult female and male, respectively, in dry season. Adult males were most sensitive to Cd, followed by females in both seasons, while highest tolerance in wet season was observed in instar V nymph...
July 19, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28734125/a-systematic-review-and-meta-analysis-of-cold-in-situ-perfusion-and-preservation-of-the-hepatic-allograft-working-towards-a-unified-approach
#4
REVIEW
Ahmer M Hameed, Jerome M Laurence, Vincent W T Lam, Henry C Pleass, Wayne J Hawthorne
BACKGROUND: The efficacy of cold in situ perfusion and static storage of the liver is one possible determinant of transplantation outcomes. The aim of this study was to determine whether there is evidence to substantiate a preference for a particular perfusion route (aortic or dual) or perfusion/preservation solution in donation after brain-death (DBD) liver transplantation. METHODS: The Embase, Medline and Cochrane databases were utilized (1980-2017). Random effects modeling was used to estimate effects on transplantation outcomes based upon (i) aortic or dual in situ perfusion, and (ii) the use of University of Wisconsin (UW), histidine-tryptophan-ketoglutarate (HTK), Celsior and/or Institut Georges Lopez-1 (IGL-1) for perfusion/preservation...
July 22, 2017: Liver Transplantation
https://www.readbyqxmd.com/read/28732274/new-source-models-to-represent-the-irradiation-process-in-panoramic-gamma-irradiator
#5
Maritza R Gual, Felix M Milian, Amir Z Mesquita, Claubia Pereira
The use of gamma irradiation technologies generates a number of complex scientific and technical problems; for example, the target is manually loaded onto turntables and is rotated during the entire irradiation process and the MCNPX three-dimensional geometry simulation is kept static. For this, it is necessary to introduce additional approaches. In this paper, two new methodologies are proposed for the simulation of irradiation process in panoramic gamma irradiator. The study was performed at the gamma irradiation facility at the Nuclear Technology Development Center of the National Nuclear Energy Commission, Brazil...
June 30, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28731527/mechanotransduction-effects-on-endothelial-cell-proliferation-via-cd31-and-vegfr2-implications-for-immunomagnetic-separation
#6
Kalpesh D Mahajan, Gauri M Nabar, Wei Xue, Mirela Anghelina, Nicanor Moldovan, Jeffrey Chalmers, Jessica Winter
Immunomagnetic separation is used to isolate circulating endothelial cells (ECs) and endothelial progenitor cells (EPCs) for diagnostics and tissue engineering. However, potentially detrimental changes in cell properties have been observed post-separation. Here, we studied the effect of mechanical force, which is naturally applied during immunomagnetic separation, on proliferation of human umbilical vein endothelial cells (HUVEC), kinase insert domain-positive receptor (KDR) cells, and peripheral blood mononuclear cells (PBMCs)...
July 21, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28731145/piezo1-protein-induces-the-apoptosis-of-human-osteoarthritis-derived-chondrocytes-by-activating-caspase-12-the-signaling-marker-of-er-stress
#7
Xiao-Fei Li, Zhao Zhang, Zhu-Ke Chen, Zhao-Wei Cui, Hai-Ning Zhang
The present study was carried out to determine whether the mechanically activated cation channel Piezo1 protein plays a role as a signaling pathway which causes the apoptosis of human chondrocytes. The chondrocytes were isolated, cultured, and then subjected to mechanical stretch force for 0, 2, 12, 24 and 48 h, respectively. The expression levels of Piezo1 and the apoptosis-related protein caspase-12 were assessed by reverse transcription-quantitative polymerase chain reaction, as well as the apoptosis-related genes, B cell lymphoma/leukemia-2 (Bcl-2), Bcl-associated X protein (Bax) and Bcl-2-associated death promoter (BAD)...
July 19, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28730867/external-load-training-does-not-alter-balance-performance-in-well-trained-women
#8
Jeffrey D Simpson, Brandon L Miller, Eric K O'Neal, Harish Chander, Adam C Knight
This study investigated the influence of external load training (ELT) on static and dynamic balance. Nineteen females stratified into two groups (ELT = 9, control = 10) completed three testing sessions over 6 weeks. The ELT group wore weighted vests (WV) of ~8% body mass for 32 h/week during daily living and three training sessions/week for 3 weeks. Following completion of ELT, a 3 week detraining (DET) phase was completed. Bilateral and unilateral static balance were assessed with eyes open and closed...
July 21, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28730810/static-and-dynamic-water-motion-induced-instability-in-oxide-thin-film-transistors-and-its-suppression-by-using-low-k-fluoropolymer-passivation
#9
Seungbeom Choi, Jeong-Wan Jo, Jaeyoung Kim, Seungho Song, Jaekyun Kim, Sung Kyu Park, Yong-Hoon Kim
Here, we report static and dynamic water motion-induced instability in indium-gallium-zinc-oxide (IGZO) thin-film transistors (TFTs) and its effective suppression with the use of a simple, solution-processed low-k (ε ~ 1.9) fluoroplastic resin (FPR) passivation layer. The liquid-contact electrification effect, in which an undesirable drain current modulation is induced by a dynamic motion of charged liquid such as water, can cause a significant instability in IGZO TFTs. It was found that by adopting a thin (~44 nm) FPR passivation layer for IGZO TFTs, the current modulation induced by the water-contact electrification was greatly reduced in both off- and on-states of the device...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28730749/impact-of-the-dynamic-and-static-component-of-the-sport-practiced-for-electrocardiogram-analysis-in-screening-athletes
#10
Nicolas Maillot, Charles Guenancia, Nobila V Yameogo, Aurélie Gudjoncik, Fabien Garnier, Luc Lorgis, Frédéric Chagué, Yves Cottin
BACKGROUND: To interpret the electrocardiogram (ECG) of athletes, the recommendations of the ESC and the Seattle criteria define type-1 peculiarities, those induced by training, and type-2, those not induced by training, to rule out cardiomyopathy. The specificity of the screening was improved by Sheikh who definied "Refined Criteria", which includes a group of intermediate peculiarities. The aim of our study was to investigate the influence of static and dynamic components on the prevalence of different types of abnormalities...
July 21, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28730680/cervical-stability-training-with-and-without-core-stability-training-for-patients-with-cervical-disc-herniation-a-randomized-single-blind-study
#11
B Buyukturan, A Guclu-Gunduz, O Buyukturan, Y Dadali, S Bilgin, E E Kurt
BACKGROUND: This study aims at evaluating and comparing the effects of cervical stability training to combined cervical and core stability training in patients with neck pain and cervical disc herniation. METHODS: Fifty patients with neck pain and cervical disc herniation were included in the study, randomly divided into two groups as cervical stability and cervical-core stability. Training was applied three times a week in three phases, and lasted for a total duration of 8 weeks...
July 20, 2017: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/28730394/helical-polyacetylenes-induced-via-noncovalent-chiral-interactions-and-their-applications-as-chiral-materials
#12
REVIEW
Katsuhiro Maeda, Eiji Yashima
Construction of predominantly one-handed helical polyacetylenes with a desired helix sense utilizing noncovalent chiral interactions with nonracemic chiral guest compounds based on a supramolecular approach is described. As with the conventional dynamic helical polymers possessing optically active pendant groups covalently bonded to the polymer chains, this noncovalent helicity induction system can show significant chiral amplification phenomena, in which the chiral information of the nonracemic guests can transfer with high cooperativity through noncovalent bonding interactions to induce an almost single-handed helical conformation in the polymer backbone...
August 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28729931/validity-and-reliability-of-the-catwalk-system-as-a-static-and-dynamic-gait-analysis-tool-for-the-assessment-of-functional-nerve-recovery-in-small-animal-models
#13
Elisabeth A Kappos, Patricia K Sieber, Patricia E Engels, Alessio V Mariolo, Salvatore D'Arpa, Dirk J Schaefer, Daniel F Kalbermatten
INTRODUCTION: A range of behavioral testing paradigms have been developed for the research of central and peripheral nerve injuries with the help of small animal models. Following any nerve repair strategy, improved functional outcome may be the most important evidence of axon regeneration. A novel automated gait analysis system, the CatWalk(™), can measure dynamic as well as static gait patterns of small animals. Of most interest in detecting functional recovery are in particular dynamic gait parameters, coordination measures, and the intensity of the animals paw prints...
July 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28729891/vibrational-excitation-of-h2-scattering-from-cu-111-effects-of-surface-temperature-and-of-allowing-energy-exchange-with-the-surface
#14
Geert-Jan Kroes, J I Juaristi, M Alducin
In scattering of H2 from Cu(111), vibrational excitation has so far defied an accurate theoretical description. To expose the causes of the large discrepancies with experiment, we investigate how the feature due to vibrational excitation (the "gain peak") in the simulated time-of-flight spectrum of (v = 1, j = 3) H2 scattering from Cu(111) depends on the surface temperature (Ts) and the possibility of energy exchange with surface phonons and electron-hole pairs (ehp's). Quasi-classical dynamics calculations are performed on the basis of accurate semiempirical density functionals for the interaction with H2 + Cu(111)...
June 29, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28729168/ecological-momentary-assessment-of-pain-fatigue-depressive-and-cognitive-symptoms-reveals-significant-daily-variability-in-multiple-sclerosis
#15
Anna L Kratz, Susan L Murphy, Tiffany J Braley
OBJECTIVE: To describe the daily variability and patterns of pain, fatigue, depressed mood, and cognitive function in persons with multiple sclerosis (MS). DESIGN: Repeated-measures observational study of seven consecutive days of home monitoring, including ecological momentary assessment (EMA) of symptoms. Multilevel mixed models were used to analyze data. SETTING: General community. PARTICIPANTS: Ambulatory adults (N=107) with MS recruited through [Masked] and surrounding community...
July 17, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28728587/minimally-invasive-unilateral-pedicle-screws-and-a-translaminar-facet-screw-fixation-and-interbody-fusion-for-treatment-of-single-segment-lower-lumbar-vertebral-disease-surgical-technique-and-preliminary-clinical-results
#16
Peng Huang, Yiguo Wang, Jiao Xu, Bo Xiao, Jianheng Liu, Luyang Che, Keya Mao
BACKGROUND: Conventional open transforaminal lumbar interbody fusion (TLIF) using unilateral pedicle screws and a translaminar facet screw has been performed for many years with good results. The outcomes of minimally invasive TLIF (MIS TLIF) are similar to the good outcomes of open TLIF, with the additional benefits of reducing iatrogenic injury, shortening hospital stays, and reducing the recovery duration. Instead of using small cuts on both sides, we performed MIS TLIF through a single cut using unilateral pedicle screws and a translaminar facet screw...
July 20, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28728043/autofocus-on-moving-object-in-scanning-electron-microscope
#17
Andrey V Kudryavtsev, Sounkalo Dembélé, Nadine Piat
The sharpness of the images coming from a Scanning Electron Microscope (SEM) is a very important property for many computer vision applications at micro- and nanoscale. It represents how much object details are distinctive in the images: the object may be perceived sharp or blurred. Image sharpness highly depends on the value of focal distance, or working distance in the case of the SEM. Autofocus is the technique allowing to automatically adjust the working distance to maximize the sharpness. Most of the existing algorithms allows working only with a static object which is enough for the tasks of visualization, manual microanalysis or microcharacterization...
July 12, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28727809/optical-modelling-of-a-supplementary-tunable-air-spaced-goggle-lens-for-rodent-eye-imaging
#18
Elie de Lestrange-Anginieur, Xiaoyun Jiang, Qiushi Ren
Aberration variations severely degrade retinal imaging in small animal eyes. Previously, the approach of a goggle lens with a matching corneal index was proposed to overcome the on-axis resolution limit of static imaging systems, which allows the use of the full eye pupil. But this technique didn't address the problem of the large power variation, and the ensuing aberration on and off-axis, when dealing with small animal eyes. In this study, we present the concept of a tunable goggle lens, designed to compensate individual ocular aberration for different rodent eye powers...
2017: PloS One
https://www.readbyqxmd.com/read/28727438/a-wettability-metric-for-characterization-of-capillary-flow-on-textured-superhydrophilic-surfaces
#19
Taylor P Allred, Justin A Weibel, Suresh V Garimella
Surface wettability is typically characterized by measuring the static contact angle of a sessile droplet placed on the surface. For extremely wetting surfaces on which liquid spontaneously spreads into a thin liquid film, the near-zero static contact angle is not amenable to measurement and does not fully describe the wetting behavior. There are unmet needs in microfluidics, boiling heat transfer enhancement, and anti-fogging applications for a metric to characterize highly wetting (i.e., superhydrophilic) textured surfaces based on their capillary-driven liquid pumping performance, as a supplement to the contact angle for this highly wetting regime...
July 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28727318/appropriate-cyclic-tensile-strain-promotes-biological-changes-of-cranial-base-synchondrosis-chondrocytes
#20
F Chu, Q Feng, Z Hu, G Shen
OBJECTIVES: This study was designed to clarify biological changes of cranial base synchondrosis chondrocytes (CBSCs) upon cyclic tensile strain (CTS) loading which simulated orthopaedic mechanical protraction on cranial base synchondroses (CBS). MATERIAL AND METHODS: A two-step digestion method was used to isolate CBSCs obtained from 1-week-old Sprague Dawley rats. Immunohistochemical staining of type II collagen and Sox9 was conducted to identify chondrocytes. A CTS of 1 Hz and 10% elongation was applied to the second passage of CBSCs by FX-5000™ Tension System for 24 hours...
August 2017: Orthodontics & Craniofacial Research
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