keyword
MENU ▼
Read by QxMD icon Read
search

Viscoelastic

keyword
https://www.readbyqxmd.com/read/27918540/in-vivo-quantification-of-spatially-varying-mechanical-properties-in-developing-tissues
#1
Friedhelm Serwane, Alessandro Mongera, Payam Rowghanian, David A Kealhofer, Adam A Lucio, Zachary M Hockenbery, Otger Campàs
The mechanical properties of the cellular microenvironment and their spatiotemporal variations are thought to play a central role in sculpting embryonic tissues, maintaining organ architecture and controlling cell behavior, including cell differentiation. However, no direct in vivo and in situ measurement of mechanical properties within developing 3D tissues and organs has yet been performed. Here we introduce a technique that employs biocompatible, magnetically responsive ferrofluid microdroplets as local mechanical actuators and allows quantitative spatiotemporal measurements of mechanical properties in vivo...
December 5, 2016: Nature Methods
https://www.readbyqxmd.com/read/27915135/primary-stability-and-viscoelastic-displacement-of-mini-implant-system-under-loading
#2
Jim Lee, Yong-Hoon Jeong, Joseph Pittman, Toru Deguchi, William M Johnston, Henry W Fields, Do-Gyoon Kim
BACKGROUND: The objectives of the current study were to examine the effects of mini-implant diameters on 1) primary stability before bone properties are changed by active peri-implant bone remodeling and 2) the time-dependent displacement of mini-implant systems in bone under a functional radial loading and their associations with bone mineral density. METHODS: Twenty one, 8mm length mini-implants (7 each for 1.4mm, 1.6mm, and 2mm diameters) were placed in mandibular sections of human cadavers (4 males and 3 females, average 69...
November 24, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27914448/a-fractional-calculus-model-of-anomalous-dispersion-of-acoustic-waves
#3
Andrew W Wharmby
An empirical formula based on viscoelastic analysis techniques that employs concepts from the fractional calculus that was used to model the dielectric behavior of materials exposed to oscillating electromagnetic fields in the radiofrequency, terahertz, and infrared bands. This work adapts and applies the formula to model viscoelastic behavior of materials that show an apparent increase of phase velocity of vibration with an increase in frequency, otherwise known as anomalous dispersion. A fractional order wave equation is derived through the application of the classic elastic-viscoelastic correspondence principle whose analytical solution is used to describe absorption and dispersion of acoustic waves in the viscoelastic material displaying anomalous dispersion in a specific frequency range...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27914388/ultrasonic-method-to-characterize-shear-wave-propagation-in-micellar-fluids
#4
Carolina Amador, Bruno L Otilio, Randall R Kinnick, Matthew W Urban
Viscoelastic micellar fluid characteristics have been measured with mechanically generated shear waves and showed good agreement to shear oscillatory methods. In this paper, shear waves in wormlike micellar fluids using ultrasound were successfully generated and detected. Micellar fluids of different concentrations (100, 200, 300, and 400 mM) were studied with ultrasound-based and conventional rheology methods. The measured micellar fluid complex modulus from oscillatory shear tests between 0.001 and 15.91 Hz was characterized with an extended Maxwell fluid model...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27913711/breadmaking-performance-and-textural-changes-during-storage-of-composite-breads-made-from-spelt-wheat-and-different-forms-of-amaranth-grain
#5
Bojana Filipčev, Marija Bodroža-Solarov, Mladenka Pestorić, Olivera Šimurina
The objectives of the present study were to assess the baking properties of composite spelt wheat-amaranth blends and to study the staling of composite breads during a six-day storage. Different forms of amaranth grains were added to spelt bread formulation: native amaranth flour and flour from popped amaranth, including their scalded and non-scalded variants. Native amaranth flour (both scalded and non-scalded) gave loaves with the highest volume and contributed to significantly softer crumb but not in comparison to the control bread...
December 2, 2016: Food Science and Technology International, Ciencia y Tecnología de Los Alimentos Internacional
https://www.readbyqxmd.com/read/27913178/estimating-the-material-properties-of-heel-pad-sub-layers-using-inverse-finite-element-analysis
#6
Nafiseh Ahanchian, Christopher J Nester, David Howard, Lei Ren, Daniel Parker
Detailed information about the biomechanical behaviour of plantar heel pad tissue contributes to our understanding of load transfer when the foot impacts the ground. The objective of this work was to obtain the hyperelastic and viscoelastic material properties of heel pad sub-layers (skin, micro-chamber and macro-chamber layers) in-vivo. An anatomically detailed 3D Finite Element model of the human heel was used to derive the sub-layer material properties. A combined ultrasound imaging and motorised platform system was used to compress heel pad and to create input data for the Finite Element model...
November 29, 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27913147/electro-kinetically-driven-peristaltic-transport-of-viscoelastic-physiological-fluids-through-a-finite-length-capillary-mathematical-modelling
#7
Dharmendra Tripathi, Ashu Yadav, O Anwar Bég
Analytical solutions are developed for the electro-kinetic flow of a viscoelastic biological liquid in a finite length cylindrical capillary geometry under peristaltic waves. The Jefferys' non-Newtonian constitutive model is employed to characterize rheological properties of the fluid. The unsteady conservation equations for mass and momentum with electro-kinetic and Darcian porous medium drag force terms are reduced to a system of steady linearized conservation equations in an axisymmetric coordinate system...
November 29, 2016: Mathematical Biosciences
https://www.readbyqxmd.com/read/27911849/scalable-manufacturing-of-biomimetic-moldable-hydrogels-for-industrial-applications
#8
Anthony C Yu, Haoxuan Chen, Doreen Chan, Gillie Agmon, Lyndsay M Stapleton, Alex M Sevit, Mark W Tibbitt, Jesse D Acosta, Tony Zhang, Paul W Franzia, Robert Langer, Eric A Appel
Hydrogels are a class of soft material that is exploited in many, often completely disparate, industrial applications, on account of their unique and tunable properties. Advances in soft material design are yielding next-generation moldable hydrogels that address engineering criteria in several industrial settings such as complex viscosity modifiers, hydraulic or injection fluids, and sprayable carriers. Industrial implementation of these viscoelastic materials requires extreme volumes of material, upwards of several hundred million gallons per year...
November 28, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27908140/sequence-control-of-phase-separation-and-dewetting-in-ps-pvme-blend-thin-films-by-changing-molecular-weight-of-ps
#9
Tian Xia, Yaping Qin, Yajiang Huang, Ting Huang, Jianhui Xu, Youbing Li
The morphology evolution mechanism of polystyrene (PS)/poly (vinyl methyl ether) (PVME) blend thin films with different PS molecular weights (Mw) was studied. It was found that the morphology evolution was closely related to the molecular weight asymmetry between PS and PVME. In the film where Mw(PS) ≈ Mw(PVME), dewetting happened at the interface between the bottom layer and substrate after SD phase separation. While in the film where Mw(PS) > Mw(PVME), dewetting happened at the interface between the middle PS/PVME blend layer and bottom PVME layer near the substrate prior to phase separation...
November 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27908120/lipid-phase-behavior-studied-with-a-quartz-crystal-microbalance-a-technique-for-biophysical-studies-with-applications-in-screening
#10
Astrid Peschel, Arne Langhoff, Eva Uhl, Aruna Dathathreyan, Susanne Haindl, Diethelm Johannsmann, Ilya Reviakine
Quartz crystal microbalance (QCM) is emerging as a versatile tool for studying lipid phase behavior. The technique is attractive for fundamental biophysical studies as well applications because of its simplicity, flexibility, and ability to work with very small amounts of material crucial for biomedical studies. Further progress hinges on the understanding of the mechanism, by which a surface-acoustic technique such as QCM, senses lipid phase changes. Here, we use a custom-built instrument with improved sensitivity to investigate phase behavior in solid-supported lipid systems of different geometries (adsorbed liposomes and bilayers)...
November 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27908086/identification-of-the-rayleigh-surface-waves-for-estimation-of-viscoelasticity-using-the-surface-wave-elastography-technique
#11
Xiaoming Zhang
The purpose of this Letter to the Editor is to demonstrate an effective method for estimating viscoelasticity based on measurements of the Rayleigh surface wave speed. It is important to identify the surface wave mode for measuring surface wave speed. A concept of start frequency of surface waves is proposed. The surface wave speeds above the start frequency should be used to estimate the viscoelasticity of tissue. The motivation was to develop a noninvasive surface wave elastography (SWE) technique for assessing skin disease by measuring skin viscoelastic properties...
November 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27908050/modeling-and-parametric-investigation-of-thick-encapsulated-microbubble-s-nonspherical-oscillations
#12
Ganesh Tamadapu, Dmitry Grishenkov, Anders Eriksson
Numerous studies have been carried out in the past few decades to investigate the radial oscillations of encapsulated microbubbles (MBs). Nonspherical oscillations also have gained attention, being unavoidable in actual applications of these bubbles. The present paper is intended to describe the nature of resonance trends of such spherical and nonspherical modes of a thick encapsulated MB filled with air and suspended in water. The shell material is assumed to be linear viscoelastic and quasi-incompressible...
November 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27908033/an-axisymmetric-time-domain-spectral-element-method-for-full-wave-simulations-application-to-ocean-acoustics
#13
Alexis Bottero, Paul Cristini, Dimitri Komatitsch, Mark Asch
The numerical simulation of acoustic waves in complex three-dimensional (3D) media is a key topic in many branches of science, from exploration geophysics to non-destructive testing and medical imaging. With the drastic increase in computing capabilities this field has dramatically grown in the last 20 years. However many 3D computations, especially at high frequency and/or long range, are still far beyond current reach and force researchers to resort to approximations, for example, by working in two dimensions (plane strain) or by using a paraxial approximation...
November 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27907987/microrheology-of-growing-escherichia-coli-biofilms-investigated-by-using-magnetic-force-modulation-atomic-force-microscopy
#14
Tiansheng Gan, Xiangjun Gong, Holger Schönherr, Guangzhao Zhang
Microrheology of growing biofilms provides insightful information about its structural evolution and properties. In this study, the authors have investigated the microrheology of Escherichia coli (strain HCB1) biofilms at different indentation depth (δ) by using magnetic force modulation atomic force microscopy as a function of disturbing frequency (f). As δ increases, the dynamic stiffness (ks) for the biofilms in the early stage significantly increases. However, it levels off when the biofilms are matured...
December 1, 2016: Biointerphases
https://www.readbyqxmd.com/read/27905494/laser-speckle-rheology-for-evaluating-the-viscoelastic-properties-of-hydrogel-scaffolds
#15
Zeinab Hajjarian, Hadi Tavakoli Nia, Shawn Ahn, Alan J Grodzinsky, Rakesh K Jain, Seemantini K Nadkarni
Natural and synthetic hydrogel scaffolds exhibit distinct viscoelastic properties at various length scales and deformation rates. Laser Speckle Rheology (LSR) offers a novel, non-contact optical approach for evaluating the frequency-dependent viscoelastic properties of hydrogels. In LSR, a coherent laser beam illuminates the specimen and a high-speed camera acquires the time-varying speckle images. Cross-correlation analysis of frames returns the speckle intensity autocorrelation function, g2(t), from which the frequency-dependent viscoelastic modulus, G*(ω), is deduced...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27901294/performance-of-functional-fibrinogen-thromboelastography-in-children-undergoing-congenital-heart-surgery
#16
Nischal K Gautam, Chunyan Cai, Olga Pawelek, Muhammad B Rafique, Davide Cattano, Evan G Pivalizza
BACKGROUND: Functional Fibrinogen assay of the Thromboelastography (FFTEG), a whole blood viscoelastic hemostatic assay, has been used to estimate fibrinogen levels in adult patients undergoing major surgery but its performance in pediatric patients undergoing cardiac surgery requires evaluation. In this study, we evaluate the correlation between FFTEG parameters and standard laboratory tests for fibrinogen and platelet counts before and after cardiopulmonary bypass in children undergoing repair for congenital heart disease...
November 30, 2016: Paediatric Anaesthesia
https://www.readbyqxmd.com/read/27898530/viscoelastic-properties-of-the-facial-retaining-ligaments
#17
Heng Shi, Ningze Yang, Zhijun Wang
No abstract text is available yet for this article.
November 28, 2016: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/27898483/reply-to-thrombin-generation-tests-and-viscoelastic-testing-in-cirrhosis-comparing-apples-and-oranges
#18
Claude Lentschener, Claire Flaujac, Isabelle Gouin-Thibault, Charles Marc Samama
No abstract text is available yet for this article.
January 2017: European Journal of Anaesthesiology
https://www.readbyqxmd.com/read/27898482/thrombin-generation-tests-and-viscoelastic-testing-in-cirrhosis-comparing-apples-and-oranges
#19
Susan Mallett, Paolo Simioni, Klaus Görlinger, Christian Fenger-Eriksen
No abstract text is available yet for this article.
January 2017: European Journal of Anaesthesiology
https://www.readbyqxmd.com/read/27898431/improving-outcome-of-trauma-patients-by-implementing-patient-blood-management
#20
Christoph Füllenbach, Kai Zacharowski, Patrick Meybohm
PURPOSE OF REVIEW: Patient blood management aims to improve patient outcome and safety by reducing the number of unnecessary red blood cell transfusions and vitalizing patient-specific anemia reserves. While this is increasingly recognized as best clinical practice in elective surgery, the implementation in the setting of trauma is restrained because of typically nonelective (emergency) surgery and, in specific circumstances, allogeneic blood transfusions as life-saving therapy. RECENT FINDINGS: Viscoelastic diagnostics allow a precise identification of trauma-induced coagulopathy...
November 24, 2016: Current Opinion in Anaesthesiology
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"