keyword
MENU ▼
Read by QxMD icon Read
search

Viscoelastic

keyword
https://www.readbyqxmd.com/read/28722133/rheological-characterization-of-gluten-from-triticale-x-triticosecale-wittmack
#1
Anna Pruska-Kędzior, Agnieszka Makowska, Zenon Kędzior, Bolesław P Salmanowicz
BACKGROUND: Triticale gluten still remains very poorly characterized rheologically. In this study the mechanical spectra of gluten isolated from four triticale cultivars were registered and fitted with Cole-Cole functions yielding the viscoelastic plateau parameters. Master spectra were calculated. Retardation test was performed and used to calculate the composite mechanical spectra and the width of viscoelastic plateau l. Protein fractional composition of triticale flour and gluten was studied using capillary zone electrophoresis...
July 19, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28722041/ultrafast-dynamics-and-solvent-dependent-deactivation-kinetics-of-bodipy-molecular-rotors
#2
Tomislav Suhina, Saeed Amirjalayer, Sander Woutersen, Daniel Bonn, Albert M Brouwer
Molecular rotors based on meso-substituted boron-dipyrromethane (BODIPY) are widely recognized fluorescent viscosity sensors. The viscosity dependence of their fluorescence arises from an efficient excited-state deactivation process that can only occur when molecular-scale motion is not hindered. Here, we use visible and IR pump-probe spectroscopies combined with TD-DFT calculations to show that this fluorescence deactivation takes place through a fast and irreversible process which does not involve intermediate electronic states...
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28720818/structural-and-rheological-properties-conferring-fertilization-competence-to-xenopus-egg-coating-envelope
#3
Mayu Hanaue, Naofumi Miwa
The extracellular egg-coating envelope that comprises a meshwork of filaments polymerized by glycoproteins plays a pivotal role in species-selective sperm recognition and subsequent fertilization; however, the structural and rheological properties conferring fertilization competence to the egg-coating envelope remain poorly unveiled. Here we show several nanoscale-structural and viscoelastic properties of the egg-coat using the transmission electron microscopy and the quartz crystal microbalance experiments, following clamp of the egg-coat at either fertilization-competent or -incompetent statuses by short-term pretreatment with synthetic peptides...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28720056/influence-of-tissue-microstructure-on-shear-wave-speed-measurements-in-plane-shear-wave-elastography-a-computational-study-in-lossless-fibrotic-liver-media
#4
Yu Wang, Jingfeng Jiang
Shear wave elastography (SWE) has been used to measure viscoelastic properties for characterization of fibrotic livers. In this technique, external mechanical vibrations or acoustic radiation forces are first transmitted to the tissue being imaged to induce shear waves. Ultrasonically measured displacement/velocity is then utilized to obtain elastographic measurements related to shear wave propagation. Using an open-source wave simulator, k-Wave, we conducted a case study of the relationship between plane shear wave measurements and the microstructure of fibrotic liver tissues...
July 1, 2017: Ultrasonic Imaging
https://www.readbyqxmd.com/read/28715374/in-vivo-evaluation-of-the-mechanical-and-viscoelastic-properties-of-the-rat-tongue
#5
Emanuele Loro, Stephen H Wang, Richard J Schwab, Tejvir S Khurana
The tongue is a highly innervated and vascularized muscle hydrostat on the floor of the mouth of most vertebrates. Its primary functions include supporting mastication and deglutition, as well as taste-sensing and phonetics. Accordingly, the strength and volume of the tongue can impact the ability of vertebrates to accomplish basic activities such as feeding, communicating, and breathing. Human patients with sleep apnea have enlarged tongues, characterized by reduced muscle tone and increased intramuscular fat that can be visualized and quantified by magnetic resonance imaging (MRI)...
July 6, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28714139/simple-radical-polymerization-of-poly-alginate-graft-n-isopropylacrylamide-injectable-thermoresponsive-hydrogel-with-the-potential-for-localized-and-sustained-delivery-of-stem-cells-and-bioactive-molecules
#6
Sreekanth Pentlavalli, Philip Chambers, Binulal N Sathy, Michelle O'Doherty, Marine Chalanqui, Daniel J Kelly, Tammy Haut-Donahue, Helen O McCarthy, Nicholas J Dunne
In this study, thermoresponsive copolymers that are fully injectable, biocompatible, and biodegradable and are synthesized via graft copolymerization of poly(N-isopropylacrylamide) onto alginate using a free-radical reaction are presented. This new synthesis method does not involve multisteps or associated toxicity issues, and has the potential to reduce scale-up difficulties. Chemical and physical analyses verify the resultant graft copolymer structure. The lower critical solution temperature, which is a characteristic of sol-gel transition, is observed at 32 °C...
July 17, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28712545/viscoelasticity-of-multicellular-surfaces
#7
REVIEW
Ivana Pajic-Lijakovic, Milan Milivojevic
Various modeling approaches have been applied to describe viscoelasticity of multicellular surfaces. The viscoelasticity is considered within three time regimes: (1) short time regime for milliseconds to seconds time scale which corresponds to sub-cellular level; (2) middle time regime for several tens of seconds to several minutes time scale which corresponds to cellular level; and (3) long time regime for several tens of minutes to several hours time scale which corresponds to supra-cellular level. Short and middle time regimes have been successfully elaborated in the literature, whereas long time viscoelasticity remains unclear...
July 6, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28707559/viscoelastic-properties-of-mitral-valve-leaflets-an-analysis-of-regional-variation-and-frequency-dependency
#8
Jonathan Baxter, Keith G Buchan, Daniel M Espino
The aim of this study was to determine the regional variation in viscoelastic properties of mitral valve leaflets over a range of physiological and patho-physiological frequencies. This included comparisons to be made between anterior and posterior leaflets, anterior leaflet clear and rough zones, and radial and circumferential leaflet orientation. Dynamic mechanical analysis was used to determine frequency-dependent viscoelastic properties. The valve leaflets were dissected from eight porcine hearts. The leaflets were loaded under a sinusoidal tensile displacement, with a mean dynamic peak to trough strain of 11%, applied to all leaflet samples at nine different frequencies, ranging from 0...
July 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28702045/functional-characterization-of-tafusca3-a-b3-superfamily-transcription-factor-gene-in-the-wheat
#9
Fusheng Sun, Xiyan Liu, Qiuhui Wei, Jiannan Liu, Tianxiang Yang, Liyang Jia, Yuesheng Wang, Guangxiao Yang, Guangyuan He
The end-use quality of wheat, including its unique rheology and viscoelastic properties, is predominantly determined by the composition and concentration of gluten proteins. While, the mechanism regulating expression of the seed storage protein (SSP) genes and other related genes in wheat remains unclear. In this study, we report on the cloning and functional identification of TaFUSCA3, a B3-superfamily transcription factor (TF) gene in wheat. Sequence alignment indicated that wheat and barley FUSCA3 genes are highly conserved...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28698411/estimation-of-turgor-pressure-through-comparison-between-single-plant-cell-and-pressurized-shell-mechanics
#10
Pauline Durand-Smet, Nicolas Chastrette, Estelle Gauquelin, Arezki Boudaoud, Atef Asnacios
While plant growth is well known to rely on turgor pressure, it is challenging to quantify the contribution of turgor pressure to plant cell rheology. Here we used a custom-made micro-rheometer to quantify the viscoelastic behavior of isolated plant cells while varying their internal turgor pressure. To get insight into how plant cells adapt their internal pressure to the osmolarity of their medium, we compared the mechanical behavior of single plant cells to that of a simple, passive, pressurized shell: a soccer ball...
July 12, 2017: Physical Biology
https://www.readbyqxmd.com/read/28697464/laminin-111-enriched-fibrin-hydrogels-for-skeletal-muscle-regeneration
#11
Madison Marcinczyk, Hady Elmashhady, Muhamed Talovic, Andrew Dunn, Faiz Bugis, Koyal Garg
Laminin (LM)-111 supplementation has improved muscle regeneration in several models of disease and injury. This study investigated a novel hydrogel composed of fibrinogen and LM-111. Increasing LM-111 concentration (50-450 μg/mL) in fibrin hydrogels resulted in highly fibrous scaffolds with progressively thinner interlaced fibers. Rheological testing showed that all hydrogels had viscoelastic behavior and the Young's modulus ranged from 2-6KPa. C2C12 myobalsts showed a significant increase in VEGF production and decrease in IL-6 production on LM-111 enriched fibrin hydrogels as compared to pure fibrin hydrogels on day 4...
July 3, 2017: Biomaterials
https://www.readbyqxmd.com/read/28696878/asynchronous-pumping-of-a-pulsatile-ventricular-assist-device-in-a-pediatric-anastomosis-model
#12
Bryan C Good, William J Weiss, Steven Deutsch, Keefe B Manning
BACKGROUND: Both pulsatile and continuous flow ventricular assist devices are being developed for pediatric congenital heart defect patients. Pulsatile devices are often operated asynchronously with the heart in either an "automatic" or a fixed beat rate mode. However, most studies have only investigated synchronized ejection. METHODS: A previously validated viscoelastic blood solver is used to investigate the parameters of pulsatility, power loss, and graft failure in a pediatric aortic anastomosis model...
July 2017: World Journal for Pediatric & Congenital Heart Surgery
https://www.readbyqxmd.com/read/28694236/fibrin-functionalization-with-synthetic-adhesive-ligands-interacting-with-%C3%AE-6%C3%AE-1-integrin-receptor-enhance-neurite-outgrowth-of-embryonic-stem-cell-derived-neural-stem-progenitors
#13
Joana Silva, Ana R Bento, Daniela Barros, Tiago L Laundos, Susana R Sousa, Pedro Quelhas, Mónica M Sousa, Ana P Pêgo, Isabel F Amaral
To enhance fibrin hydrogel affinity towards pluripotent stem cell-derived neural stem/progenitor cells (NSPCs) and its capacity to support NSPC migration and neurite extension, we explored the tethering of synthetic peptides engaging integrin α6β1, a cell receptor enriched in NSPCs. Six α6β1 integrin ligands were tested for their ability to support integrin α6β1-mediated adhesion of embryonic stem cell-derived NSPCs (ES-NSPs) and sustain ES-NSPC viability, migration, and neuronal differentiation. Due to their better performance, peptides T1, HYD1, and A5G81 were immobilized into fibrin and functionalized gels characterized in terms of peptide binding efficiency, structure and viscoelastic properties...
July 7, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28691420/recent-advances-in-tissue-conditioners-for-prosthetic-treatment-a-review
#14
REVIEW
Barbara Dorocka-Bobkowska, Dominik Medynski, Mariusz Prylinski
Tissue conditioners (TCs) are short term soft liners, formed in situ from the mixture of a polymer powder and a liquid plasticizer. The article reviews recent advances in composition, functions, clinical use, gelation process, and physical properties of TCs and their effects on denture bases and oral mucosa. TCs are used to improve the fit and function of an ill-fitting denture. They can also be used to treat abused mucosal tissues underlying ill-fitting acrylic dentures as temporary expedients. TCs are recommended as provisional liners to maintain the fit of removable dentures and to prevent mechanical irritation from the denture...
June 27, 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/28691108/jetting-of-a-shear-banding-fluid-in-rectangular-ducts
#15
Paul F Salipante, Charles A E Little, Steven D Hudson
Non-Newtonian fluids are susceptible to flow instabilities such as shear banding, in which the fluid may exhibit a markedly discontinuous viscosity at a critical stress. Here we report the characteristics and causes of a jetting flow instability of shear banding wormlike micelle solutions in microfluidic channels with rectangular cross sections over an intermediate volumetric flow regime. Particle-tracking methods are used to measure the three-dimensional flow field in channels of differing aspect ratios, sizes, and wall materials...
March 2017: Physical Review Fluids
https://www.readbyqxmd.com/read/28689901/effect-of-nonthermal-plasma-on-the-properties-of-a-resinous-liner-submitted-to-aging
#16
Marcelo Coelho Goiato, Emily Vivianne Freitas da Silva, Rodrigo Antonio de Medeiros, Sandro Basso Bitencourt, Elidiane Cipriano Rangel, Nilson Cristino da Cruz, Daniela Micheline Dos Santos
STATEMENT OF PROBLEM: The properties, such as softness and viscoelasticity, of a resinous reliner can deteriorate and extrinsic elements can become incorporated, making surface protection of the reliner material essential. PURPOSE: The purpose of this in vitro study was to evaluate the effect of low temperature plasma on Coe-Soft resinous reliner, submitted to aging in artificial saliva for up to 180 days. Sorption, solubility, Shore A hardness, surface energy, and topographic characteristics were analyzed by scanning electronic microscopy (SEM) and energy-dispersive spectroscopy (EDS)...
July 7, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28689790/cell-therapy-and-scarred-vocal-folds
#17
A Mattei, J Magalon, B Bertrand, C Philandrianos, J Veran, A Giovanni
Vocal fold microstructure is complex and can be affected by laryngeal microsurgery, inducing scarring that prevents mechanical uncoupling of epithelium and muscle, leading to vibration disorder and disabling dysphonia. Treatment options presently are few, and often without efficacy for vibration, having only an impact on volume to reduce glottal closure defect. The present review of the literature had two aims: (i) to report the current state of the literature on cell therapy in vocal fold scarring; and (ii) to analyze the therapeutic interest of the adipose-derived stromal vascular fraction in the existing therapeutic armamentarium...
July 6, 2017: European Annals of Otorhinolaryngology, Head and Neck Diseases
https://www.readbyqxmd.com/read/28688432/assessment-of-elastic-models-in-supercooled-water-a-molecular-dynamics-study-with-the-tip4p-2005f-force-field
#18
Emmanuel Guillaud, Laurent Joly, Dominique de Ligny, Samy Merabia
Glass formers exhibit a viscoelastic behavior: at the laboratory time scale, they behave like (glassy) solids at low temperatures and like liquids at high temperatures. Based on this observation, elastic models relate the long time supercooled dynamics to short time elastic properties of the supercooled liquid. In the present work, we assess the validity of elastic models for the shear viscosity and the α-relaxation time of supercooled water, using molecular dynamics simulations with the TIP4P/2005f force field over a wide range of temperatures...
July 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28687239/novel-insights-into-cardiomyocytes-provided-by-atomic-force-microscopy
#19
REVIEW
Daniele Borin, Ilaria Pecorari, Brisa Pena, Orfeo Sbaizero
Cardiovascular diseases (CVDs) are the number one cause of death globally, therefore interest in studying aetiology, hallmarks, progress and therapies for these disorders is constantly growing. Over the last decades, the introduction and development of atomic force microscopy (AFM) technique allowed the study of biological samples at the micro- and nanoscopic level, hence revealing noteworthy details and paving the way for investigations on physiological and pathological conditions at cellular scale. The present work is aimed to collect and review the literature on cardiomyocytes (CMs) studied by AFM, in order to emphasise the numerous potentialities of this approach and provide a platform for researchers in the field of cardiovascular diseases...
July 4, 2017: Seminars in Cell & Developmental Biology
https://www.readbyqxmd.com/read/28686172/ultrasonic-computed-tomography-based-on-full-waveform-inversion-for-bone-quantitative-imaging
#20
Simon Bernard, Vadim Monteiller, Dimitri Komatitsch, Philippe L Lasaygues
We introduce an ultrasonic quantitative imaging method for long bones based on full-waveform inversion. The cost function is defined as the difference in the L2-norm sense between observed data and synthetic results at a given iteration of the iterative inversion process. For simplicity, and in order to reduce the computational cost, we use a two-dimensional acoustic approximation. The inverse problem is solved iteratively based on a quasi-Newton technique called the Limited-memory Broyden-Fletcher-Goldfarb-Shanno method...
July 7, 2017: Physics in Medicine and Biology
keyword
keyword
31862
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"