keyword
MENU ▼
Read by QxMD icon Read
search

field flow fractionation

keyword
https://www.readbyqxmd.com/read/28211739/microscopic-description-of-the-granular-fluidity-field-in-nonlocal-flow-modeling
#1
Qiong Zhang, Ken Kamrin
A recent granular rheology based on an implicit "granular fluidity" field has been shown to quantitatively predict many nonlocal phenomena. However, the physical nature of the field has not been identified. Here, the granular fluidity is found to be a kinematic variable given by the velocity fluctuation and packing fraction. This is verified with many discrete element simulations, which show that the operational fluidity definition, solutions of the fluidity model, and the proposed microscopic formula all agree...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28208349/effects-of-gas-interparticle-interaction-on-dissipative-wake-mediated-forces
#2
O V Kliushnychenko, S P Lukyanets
We examine how the short-range repulsive interaction in a gas of Brownian particles affects behavior of the nonequilibrium depletion forces between obstacles embedded into the gas flow. It is shown that for an ensemble of small and widely separated obstacles the dissipative wake-mediated interaction belongs to the type of induced dipole-dipole interaction governed by an anisotropic screened Coulomb-like potential. For closely located obstacles, formation of a common density perturbation "coat" around them leads to enhancement of dissipative interaction, manifested by characteristic peaks in its dependence on both the bath fraction and the external driving field...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28196092/characterization-of-cereal-%C3%AE-glucan-extracts-from-oat-and-barley-and-quantification-of-proteinaceous-matter
#3
Claudia Zielke, Ondrej Kosik, Marie-Louise Ainalem, Alison Lovegrove, Anna Stradner, Lars Nilsson
An extraction method for mixed-linkage β-glucan from oat and barley was developed in order to minimize the effect of extraction on the β-glucan structure. β-Glucan were characterized in terms of molecular size and molar mass distributions using asymmetric flow field-flow fractionation (AF4) coupled to multiangle light scattering (MALS), differential refractive index (dRI) and fluorescence (FL) detection. The carbohydrate composition of the extracts was analysed using polysaccharide analysis by carbohydrate gel electrophoresis (PACE) and high-performance anion-exchange chromatography (HPAEC)...
2017: PloS One
https://www.readbyqxmd.com/read/28194836/quantitative-characterization-of-the-carbon-carbon-composites-components-based-on-video-of-polarized-light-microscope
#4
Yixian Li, Lehua Qi, Yongshan Song, Xujiang Chao
The components of carbon/carbon (C/C) composites have significant influence on the thermal and mechanical properties, so a quantitative characterization of component is necessary to study the microstructure of C/C composites, and further to improve the macroscopic properties of C/C composites. Considering the extinction crosses of the pyrocarbon matrix have significant moving features, the polarized light microscope (PLM) video is used to characterize C/C composites quantitatively because it contains sufficiently dynamic and structure information...
February 13, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28193064/vapor-pressure-isotope-effects-in-halogenated-organic-compounds-and-alcohols-dissolved-in-water
#5
Axel Horst, Georges Lacrampe-Couloume, Barbara Sherwood Lollar
Volatilization causes changes in the isotopic composition of organic compounds as a result of different vapor pressures of molecules containing heavy and light isotopes. Both normal and inverse vapor pressure isotope effects (VPIE) have been observed, depending on molecular interactions in the liquid phase and the investigated element. Previous studies have focused mostly on pure compound volatilization or on compounds dissolved in organic liquids. Environmentally relevant scenarios, such as isotope fractionation during volatilization of organics from open water surfaces, have largely been neglected...
December 20, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/28192938/size-dependent-lipidomic-analysis-of-urinary-exosomes-from-patients-with-prostate-cancer-by-flow-field-flow-fractionation-and-nanoflow-liquid-chromatography-tandem-mass-spectrometry
#6
Joon Seon Yang, Jong Cheol Lee, Seul Kee Byeon, Koon Ho Rha, Myeong Hee Moon
Exosomes are membrane-bound extracellular vesicles involved in intercellular communication and tumor cell metastasis. In this study, flow field-flow fractionation (FlFFF) was utilized to separate urinary exosomes by size, demonstrating a significant difference in exosome sizes between healthy controls and patients with prostate cancer (PCa). Exosome fractions of different sizes were collected for microscopic analysis during an FlFFF run and evaluated with exosome marker proteins using Western blot analysis...
February 2, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28180990/asymmetrical-flow-field-flow-fractionation-of-white-wine-chromophoric-colloidal-matter
#7
Christian Coelho, Jérémie Parot, Michael Gonsior, Maria Nikolantonaki, Philippe Schmitt-Kopplin, Edith Parlanti, Régis D Gougeon
Two analytical separation methods-size-exclusion chromatography and asymmetrical flow field-flow fractionation-were implemented to evaluate the integrity of the colloidal composition of Chardonnay white wine and the impact of pressing and fermentations on the final macromolecular composition. Wine chromophoric colloidal matter, representing UV-visible-absorbing wine macromolecules, was evaluated by optical and structural measurements combined with the description of elution profiles obtained by both separative techniques...
February 8, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28154161/development-of-coronary-pulse-wave-velocity-new-pathophysiological-insight-into-coronary-artery-disease
#8
Brahim Harbaoui, Pierre-Yves Courand, Andrei Cividjian, Pierre Lantelme
BACKGROUND: Although aortic stiffness assessed by pulse wave velocity (PWV) is a strong predictor of coronary artery disease, the significance of local coronary stiffness has never been tackled. The first objective of this study was to describe a method of measuring coronary PWV (CoPWV) invasively and to describe its determinants. The second objective was to assess both CoPWV and aortic PWV in patients presenting with acute coronary syndromes or stable coronary artery disease. METHODS AND RESULTS: In 53 patients, CoPWV was measured from the delay in pressure wave and distance traveled as a pressure wire was withdrawn from the distal to the proximal coronary segment...
February 2, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28152457/numerical-investigations-of-flow-and-passive-pollutant-exposure-in-high-rise-deep-street-canyons-with-various-street-aspect-ratios-and-viaduct-settings
#9
Lejian He, Jian Hang, Xuemei Wang, Borong Lin, Xiaohui Li, Guangdong Lan
Vehicular pollutant exposure of residents and pedestrians in high-rise deep street canyons with viaducts and noise barriers requires special concerns because the ventilation capacity is weak and the literature reported inconsistent findings on flow patterns as aspect ratios (building height/street width, H/W) are larger than 2. By conducting computational fluid dynamics (CFD) simulations coupled with the intake fraction iF and the daily pollutant exposure Et, this paper investigates the impact of street aspect ratios, viaducts and noise barriers on the flow and vehicular passive pollutant exposure in full-scale street canyons (H/W=1-6, W=24m)...
January 30, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28151990/study-of-conformational-changes-and-protein-aggregation-of-bovine-serum-albumin-in-presence-of-sb-iii-and-sb-v
#10
Marcelo Verdugo, Jorge Ruiz Encinar, José Manuel Costa-Fernández, Mario Menendez-Miranda, Diego Bouzas-Ramos, Manuel Bravo, Waldo Quiroz
Antimony is a metalloid that affects biological functions in humans due to a mechanism still not understood. There is no doubt that the toxicity and physicochemical properties of Sb are strongly related with its chemical state. In this paper, the interaction between Sb(III) and Sb(V) with bovine serum albumin (BSA) was investigated in vitro by fluorescence spectroscopy, and circular dichroism (CD) under simulated physiological conditions. Moreover, the coupling of the separation technique, asymmetric flow field-flow fractionation, with elemental mass spectrometry to understand the interaction of Sb(V) and Sb(III) with the BSA was also used...
2017: PloS One
https://www.readbyqxmd.com/read/28147564/demisting-using-an-ultrasonic-standing-wave-field
#11
T M Merrell, J R Saylor
Removing drops from an air flow can be challenging, particularly, for small drops. Herein a method for demisting is presented that employs ultrasonics to force small drops to combine. Specifically, a cylindrical ultrasonic standing wave field is established in a tube, forming pressure nodes that take the form of cylinders located within the tube and having the same axis as the tube. Droplets are driven toward these pressure nodes by the acoustic radiation force, forcing smaller drops to combine to form larger drops, which eventually fall due to gravity, thereby demisting the flow...
January 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28125712/peptide-fractions-obtained-from-rice-by-products-by-means-of-an-environment-friendly-process-show-in-vitro-health-related-bioactivities
#12
Maura Ferri, Jürgen Graen-Heedfeld, Karlheinz Bretz, Fabien Guillon, Elisa Michelini, Maria Maddalena Calabretta, Matteo Lamborghini, Nicolò Gruarin, Aldo Roda, Axel Kraft, Annalisa Tassoni
Recently, the isolation of new health-related bioactive molecules derived from agro-food industrial by-products by means of environment-friendly extraction processes has become of particular interest. In the present study, a protein by-product from the rice starch industry was hydrolysed with five commercial proteolytic enzymes, avoiding the use of solvents or chemicals. The digestion processes were optimised, and the digestates were separated in fractions with four different molecular weight ranges by using a cross-flow membrane filtration technique...
2017: PloS One
https://www.readbyqxmd.com/read/28116495/field-flow-fractionation-techniques-to-explore-the-nano-world
#13
REVIEW
Catia Contado
Field flow fractionation (FFF) techniques are used to successfully characterize several nanomaterials by sizing nano-entities and producing information about the aggregation/agglomeration state of nanoparticles. By coupling FFF techniques to specific detectors, researchers can determine particle-size distributions (PSDs), expressed as mass-based or number-based PSDs. This review considers FFF applications in the food, biomedical, and environmental sectors, mostly drawn from the past 4 y. It thus underlines the prominent role of asymmetrical flow FFF within the FFF family...
January 23, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28107472/fractionation-of-magnetic-microspheres-in-a-microfluidic-spiral-interplay-between-magnetic-and-hydrodynamic-forces
#14
S Dutz, M E Hayden, U O Häfeli
Magnetic forces and curvature-induced hydrodynamic drag have both been studied and employed in continuous microfluidic particle separation and enrichment schemes. Here we combine the two. We investigate consequences of applying an outwardly directed magnetic force to a dilute suspension of magnetic microspheres circulating in a spiral microfluidic channel. This force is realized with an array of permanent magnets arranged to produce a magnetic field with octupolar symmetry about the spiral axis. At low flow rates particles cluster around an apparent streamline of the flow near the outer wall of the turn...
2017: PloS One
https://www.readbyqxmd.com/read/28102826/ceramic-particle-engulfment-by-fibroblasts-does-not-alter-at-all-cell-behavior
#15
Pierre-Antoine Faye, Olivier Roualdes, Fabrice Rossignol, Daniel Jean Hartmann, Alexis Desmoulière
Despite many studies, the impact of ceramic particles on cell behavior remains still unclear. The aim of the present study was to investigate the effects of ceramic nano-sized particles on fibroblastic cells. Fibroblasts (dermal fibroblasts freshly isolated from skin samples and WI26 fibroblastic cells) were cultured in monolayer in the presence of alumina or cerium-zirconia particles (��� 50 nm diameter) at two concentrations (100 or 500 ��g.mL-1). Fluorescent alumina particles were also used. Cell morphology, cytoplasmic ceramic incorporation using confocal and transmission electron microscopy, and migration using silicon insert, were analyzed...
January 19, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28100277/stress-echo-2020-the-international-stress-echo-study-in-ischemic-and-non-ischemic-heart-disease
#16
Eugenio Picano, Quirino Ciampi, Rodolfo Citro, Antonello D'Andrea, Maria Chiara Scali, Lauro Cortigiani, Iacopo Olivotto, Fabio Mori, Maurizio Galderisi, Marco Fabio Costantino, Lorenza Pratali, Giovanni Di Salvo, Eduardo Bossone, Francesco Ferrara, Luna Gargani, Fausto Rigo, Nicola Gaibazzi, Giuseppe Limongelli, Giuseppe Pacileo, Maria Grazia Andreassi, Bruno Pinamonti, Laura Massa, Marco A R Torres, Marcelo H Miglioranza, Clarissa Borguezan Daros, José Luis de Castro E Silva Pretto, Branko Beleslin, Ana Djordjevic-Dikic, Albert Varga, Attila Palinkas, Gergely Agoston, Dario Gregori, Paolo Trambaiolo, Sergio Severino, Ayana Arystan, Marco Paterni, Clara Carpeggiani, Paolo Colonna
BACKGROUND: Stress echocardiography (SE) has an established role in evidence-based guidelines, but recently its breadth and variety of applications have extended well beyond coronary artery disease (CAD). We lack a prospective research study of SE applications, in and beyond CAD, also considering a variety of signs in addition to regional wall motion abnormalities. METHODS: In a prospective, multicenter, international, observational study design, > 100 certified high-volume SE labs (initially from Italy, Brazil, Hungary, and Serbia) will be networked with an organized system of clinical, laboratory and imaging data collection at the time of physical or pharmacological SE, with structured follow-up information...
January 18, 2017: Cardiovascular Ultrasound
https://www.readbyqxmd.com/read/28098465/rejection-of-commonly-used-electrolytes-in-asymmetric-flow-field-flow-fractionation-effects-of-membrane-molecular-weight-cutoff-size-fluid-dynamics-and-valence-of-electrolytes
#17
Thilak K Mudalige, Haiou Qu, Sean W Linder
Asymmetric flow field flow fractionation (AF4) is an efficient size-based separation technique for the characterization of submicron size particulates. In AF4, membranes having various molecular weight cutoff sizes are used as a barrier to retain particles while allowing the carrier fluid containing electrolytes to permeate. Here, we have hypothesized that electrolyte rejection by the barrier membrane leads to the accumulation of electrolytes in the channel during operation. Electrolyte accumulation can cause various adverse effects that can lead to membrane fouling...
January 31, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28069126/characterization-of-a-water-soluble-hyperbranched-arabinogalactan-from-yacon-smallanthus-sonchifolius-roots
#18
Alejandra Castro, Francisco Vilaplana, Lars Nilsson
Yacon (Smallanthus sonchifolius Poepp. & Endl.) roots are largely grown in Andean countries and have attracted recent interest due to their antioxidant and prebiotic effects. Yacon is typically consumed as a fruit due to its sweet taste and juiciness. The macromolecular properties of an aqueous extract of yacon are investigated using asymmetric flow field-flow fractionation (AF4) coupled to UV, multiangle light scattering (MALS) and differential refractive index (dRI) detection. The method allows for determination of molar mass and size over the size distribution...
May 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28068549/hetero-aggregation-of-oppositely-charged-nanoparticles
#19
Pooja Bansal, Abhijit P Deshpande, Madivala G Basavaraj
Hetero-aggregation refers to aggregation of particles that are not identical i.e. particles of different physical-chemical properties. The investigation of this phenomenon is important because of the fascinating structures that can be formed and their application in several fields including the synthesis of porous materials and particle stabilized emulsions. We report an experimental study of hetero-aggregation behaviour of oppositely charged nanoparticles of similar size. In this study, the hetero-aggregation phenomenon is investigated using a combination of visual observation, zeta potential measurements, dynamic light scattering, scanning electron microscopy and rheology measurements...
April 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28046320/we-fg-206-06-dual-input-tracer-kinetic-modeling-and-its-analog-implementation-for-dynamic-contrast-enhanced-dce-mri-of-malignant-mesothelioma-mpm
#20
S Lee, A Rimner, S Hayes, M Hunt, J Deasy, M Zauderer, V Rusch, N Tyagi
PURPOSE: To use dual-input tracer kinetic modeling of the lung for mapping spatial heterogeneity of various kinetic parameters in malignant MPM METHODS: Six MPM patients received DCE-MRI as part of their radiation therapy simulation scan. 5 patients had the epitheloid subtype of MPM, while one was biphasic. A 3D fast-field echo sequence with TR/TE/Flip angle of 3.62ms/1.69ms/15° was used for DCE-MRI acquisition. The scan was collected for 5 minutes with a temporal resolution of 5ߝ9 seconds depending on the spatial extent of the tumor...
June 2016: Medical Physics
keyword
keyword
106672
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"