Open Access. Powered by Scholars. Published by Universities.®

Medicine and Health Sciences Commons™

Open Access. Powered by Scholars. Published by Universities.®

Viscosity

Discipline
Institution
Publication Year
Publication
Publication Type
File Type

Articles 1 - 19 of 19

Full-Text Articles in Medicine and Health Sciences

Viscosity Of Commercial Thickeners In Combination With Different Beverages Of Honey- And Nectar-Like Consistency And Their Change Over Time, Wei-Chun Che, Yuan-Ching Tsai, Meng-I Kuo, Tsan-Hon Liou Dec 2022

Viscosity Of Commercial Thickeners In Combination With Different Beverages Of Honey- And Nectar-Like Consistency And Their Change Over Time, Wei-Chun Che, Yuan-Ching Tsai, Meng-I Kuo, Tsan-Hon Liou

Rehabilitation Practice and Science

Objective: This study investigated the viscosity of four beverages (green tea, grape juice, sugar-free soy milk, and Ensure®) thickened to a nectar- and honey-like consistency with five thickening products (Resource® Thickenup® Clear, Toromeal, Toromi-up, eNutrition, and Sentosa) marketed in Taiwan. The sample viscosity over time was compared. Furthermore, the results were compared with the guidelines of National Dysphagia Diet (NDD) established by the American Dietetic Association. Methods: The viscosity was measured using the Brookfield RVDV-II+ Pro viscometer with small sample adaptor, shear rate set at 50 s-1, temperature at 25℃. Results: The results showed that almost all thickening products in …

Go to article

Rheological Characterization Of Blood-Mimicking Fluids For Use In Particle Image Velocimetry, Anorin S. Ali Aug 2022

Rheological Characterization Of Blood-Mimicking Fluids For Use In Particle Image Velocimetry, Anorin S. Ali

Undergraduate Student Research Internships Conference

Blood-mimicking fluids (BMFs) are often used to investigate blood flow using physical replicas of vessels with cardiovascular disease. Particle image velocimetry (PIV) is used with silicone poly-dimethyl siloxane (PDMS) vascular models to visualize this flow. The challenge is creating a blood-mimicking fluid that matches the viscosity profile, viscoelasticity, and density of whole blood while also matching the refractive index (RI) of PDMS. Water-glycerol solutions are commonly used with sodium iodide (NaI) added to increase the RI without changing viscosity. However, NaI is expensive, stains easily, and turns fluids from optically clear to yellow in less than a day. Furthermore, without …

Go to article

Hyaluronic Acid In Viscous Malignant Mesothelioma Pleural Effusion, Hui Min Cheah, Deirdre Fitzgerald, Amber Louw, Jenette Creaney, Y. C.Gary Lee Jan 2021

Hyaluronic Acid In Viscous Malignant Mesothelioma Pleural Effusion, Hui Min Cheah, Deirdre Fitzgerald, Amber Louw, Jenette Creaney, Y. C.Gary Lee

Research outputs 2014 to 2021

© 2020 The Authors. Respirology Case Reports published by John Wiley & Sons Australia, Ltd on behalf of The Asian Pacific Society of Respirology Malignant pleural effusion (MPE) is common with mesothelioma. We report two cases of extraordinarily viscous MPEs associated with mesothelioma. The viscosity prohibited spontaneous gravity-dependent drainage via indwelling pleural catheters. Our ex vivo experiments found very high hyaluronic acid (HA) content within the fluid. Treatment of the fluid with hyaluronidase, but not with deoxyribonucleases, significantly reduced fluid viscosity. The results provide proof that HA can contribute to high viscosity of pleural fluid in mesothelioma. Research into strategies …

Go to article

Simulation Of A Rat Muscle-Tendon Unit With Hill-Type Model Dynamics And The Study Of Viscoelasticity In A Collagen Molecule Via Molecular Dynamics, Veronica Siko Jan 2021

Simulation Of A Rat Muscle-Tendon Unit With Hill-Type Model Dynamics And The Study Of Viscoelasticity In A Collagen Molecule Via Molecular Dynamics, Veronica Siko

West Chester University Master’s Theses

The field of biological science has established that tendons transfer muscular forces to adjacent bones, but there is a dearth of information about the underlying physical principles of these interactions and how the property of viscoelasticity (displayed in tendons as a difference in mechanical response to stress with differing stretching rates) is encompassed in the collagen of tendons. This thesis details the results of concentric and eccentric contractions of the rat muscle-tendon unit (MTU) with and without viscoelasticity (concentric contraction requires active shortening of the muscle, while eccentric contraction requires active lengthening of the muscle) (Lovering & Brooks, 2014). Once …

Go to article

Effects Of Liquid Viscosity And Food Texture On Swallowing Sounds, Chun Feng May 2020

Effects Of Liquid Viscosity And Food Texture On Swallowing Sounds, Chun Feng

Theses & Dissertations

Cervical auscultation (CA) is a technique of monitoring swallowing performance according to swallowing acoustic signals utilizing a stethoscope or other measurement devices such as a microphone and an accelerometer. In the past few years, doctors have utilized the stethoscope to identify the swallowing sounds, which resulted in an inability to accurately diagnose the aspiration/penetration in patients with dysphagia when compared to the gold standard. A digital CA assessment records swallowing acoustic signals and extracts the specific features from the recordings. It has been proven that digital CA as a promising portable and low-cost tool can be used for identifying patients …

Go to article

Study Of Blood Viscosity With Added Sodium Nitrate And Temperature Variance: A Potential Therapy To Regulate Blood Flow After Induced Hypothermia, Brianna Munnich Jul 2019

Study Of Blood Viscosity With Added Sodium Nitrate And Temperature Variance: A Potential Therapy To Regulate Blood Flow After Induced Hypothermia, Brianna Munnich

Pence-Boyce STEM Student Scholarship

The human body has natural systems for vasodilation which are fueled by nitric oxide production, but in cases of cardiac disfunction and stress nitric oxide can be inhibited. In this study, nitric oxide was studied as a mediator for the blood rush experienced from the warming after induced hypothermia. Nitric oxide (NO) was introduced through sodium nitrate, which was aimed to reduce the speed and turbulence of blood flow through interaction between NO and the active site of hemoglobin. A viscometer was used to examine the rate of blood flow, while the temperature was varied to simulate the conditions of …

Go to article

Investigating The Effects Of Orientation Control Of Graphene Nanoplatelet Suspensions By A Magnetic Field On The Viscosity Of A Nanofluid System, Radhika Iyer Jan 2018

Investigating The Effects Of Orientation Control Of Graphene Nanoplatelet Suspensions By A Magnetic Field On The Viscosity Of A Nanofluid System, Radhika Iyer

Graduate Research Theses & Dissertations

In this investigation, the rheological behavior of paraffin oil containing diamagnetic suspensions is characterized under varying magnetic field conditions. The particles suspended in the white paraffin oil at mass concentrations of 0.1, 0.3, 0.5, 0.7 and 1% m/m are two-dimensional graphene nanoplatelets with an average thickness of 2 – 8 nm. Rheological experiments were conducted using a Brookfield DV2T viscometer with a modified cylindrical spindle over the range of shear rates between 192 s-1 to 1928 s-1. A Neodymium N42 ring magnet with a surface strength of 1.32 T generated the magnetic field conditions for the rheological experiments and was …

Go to article

Mucus Adhesion As A Therapeutic Target In Cystic Fibrosis, Courtney Fernandez Petty Jan 2018

Mucus Adhesion As A Therapeutic Target In Cystic Fibrosis, Courtney Fernandez Petty

All ETDs from UAB

Cystic fibrosis (CF) is a genetic disease resulting from mutations of the cystic fibrosis transmembrane conductance regulator (CFTR) gene. CFTR is an ion channel responsible for proper movement of chloride and bicarbonate ions across the apical cell surface. Defective CFTR results in an absence of bicarbonate transport, which functions in part to chelate Ca2+, a divalent cation found in abundance in mucin granules in normal conditions; this yields a hyperviscous and adhesive mucus on the respiratory and gastrointestinal tracts of patients with CF. Bronchial mucins are glycosylated proteins with neutral and negative sugars modified by negatively charged sialic and neuraminic …

Go to article

Effects Of Whole Blood Viscosity And Plasma Nox On Cardiac Function And Cerebral Blood Flow In Children With Chronic Kidney Disease, Necla Buyan, Meltem Akçaboy, Tayfun Göktaş, Serdar Kula, Bi̇jen Nazliel, Ni̇lgün Çakar, Nermi̇n Uncu, Bülent Çeli̇k, Deni̇z Erbaş Jan 2017

Effects Of Whole Blood Viscosity And Plasma Nox On Cardiac Function And Cerebral Blood Flow In Children With Chronic Kidney Disease, Necla Buyan, Meltem Akçaboy, Tayfun Göktaş, Serdar Kula, Bi̇jen Nazliel, Ni̇lgün Çakar, Nermi̇n Uncu, Bülent Çeli̇k, Deni̇z Erbaş

Turkish Journal of Medical Sciences

Background/aim: The aim of the study was to investigate the effects of whole blood viscosity and plasma nitric oxide on cerebral and cardiovascular risks associated with chronic kidney disease. Materials and methods: The study group consisted of 40 pediatric patients and 21 healthy control subjects. Hematologic and biochemical variables, viscosity and plasma nitric oxide levels, echocardiographic findings, and middle cerebral artery blood flow velocity were examined. Results: Viscosity values of patients were significantly lower than those of the control group. Lower values of hematocrit, total protein, and albumin and higher values of ferritin in all patient groups resulted in significantly …

Go to article

Physicochemical And Biochemical Parameters In Milk Of Serbian Breastfeeding Women, Slavica Sunaric, Marko Denic, Jelena Lalic, Tatjana Jovanovic, Ana Spasic, Jelena Zivkovic, Natasa Trutic, Gordana Kocic Jan 2017

Physicochemical And Biochemical Parameters In Milk Of Serbian Breastfeeding Women, Slavica Sunaric, Marko Denic, Jelena Lalic, Tatjana Jovanovic, Ana Spasic, Jelena Zivkovic, Natasa Trutic, Gordana Kocic

Turkish Journal of Medical Sciences

Background/aim: This study was undertaken to determine the changes and relationships between some important milk constituents as well as physical, rheological, and biochemical parameters of milk obtained from Serbian breastfeeding mothers. Materials and methods: Physicochemical and biochemical parameters and the concentrations of vitamins, uric acid, and minerals were determined during the three periods of lactation covering colostrum, transitional, and mature milk collected from 67 mothers who had a term-pregnancy. Results: Large interindividual variations regarding many parameters were found between mothers at the same period of lactation, but the average values were mostly in the expected and recommended ranges. For some …

Go to article

Beyond The Excluded Volume Effects: Mechanistic Complexity Of The Crowded Milieu, Irina M. Kuznetsova, Boris Y. Zaslavsky, Leonid Breydo, Konstantin K. Turoverov, Vladimir N. Uversky Jan 2015

Beyond The Excluded Volume Effects: Mechanistic Complexity Of The Crowded Milieu, Irina M. Kuznetsova, Boris Y. Zaslavsky, Leonid Breydo, Konstantin K. Turoverov, Vladimir N. Uversky

Molecular Medicine Faculty Publications

Macromolecular crowding is known to affect protein folding, binding of small molecules, interaction with nucleic acids, enzymatic activity, protein-protein interactions, and protein aggregation. Although for a long time it was believed that the major mechanism of the action of crowded environments on structure, folding, thermodynamics, and function of a protein can be described in terms of the excluded volume effects, it is getting clear now that other factors originating from the presence of high concentrations of “inert” macromolecules in crowded solution should definitely be taken into account to draw a more complete picture of a protein in a crowded milieu. …

Go to article

The Effect Of Electron Beam Irradiation On Β-Glucan Content, X-Ray Diffraction Of Starch, Protein Subunit Patterns, And In Vivo Digestibility Of Barley Grain In Cockerels, Parvin Shawrang, Ali Asghar Sadeghi, Behnam Ghorbani Jan 2013

The Effect Of Electron Beam Irradiation On Β-Glucan Content, X-Ray Diffraction Of Starch, Protein Subunit Patterns, And In Vivo Digestibility Of Barley Grain In Cockerels, Parvin Shawrang, Ali Asghar Sadeghi, Behnam Ghorbani

Turkish Journal of Veterinary & Animal Sciences

This study was carried out to evaluate the effect of electron beam radiation on the chemical composition, the \beta-glucan content, the water extract viscosity, the crystallinity of starch, the patterns of protein subunits, and the in vivo digestibility of barley grain. Barley samples were irradiated at doses of 10, 15, 20, 25, and 30 kGy under the electron beam. In a completely randomized design, cockerels were fed raw or irradiated samples to determine the digestibility of crude protein and gross energy. Irradiation had no effect on the total contents of protein, starch, and \beta-glucan. At doses of 10, 15, 20, …

Go to article

Haemorheology Of The Eastern Grey Kangaroo And The Tasmanian Devil, Michael Simmonds, Oguz Baskurt, Herbert Meiselman, Michael Pyne, Michael Kakanis, Ekua Brenu, James Keane, Rhys Christy, Sonya Marshall-Gradisnik Feb 2012

Haemorheology Of The Eastern Grey Kangaroo And The Tasmanian Devil, Michael Simmonds, Oguz Baskurt, Herbert Meiselman, Michael Pyne, Michael Kakanis, Ekua Brenu, James Keane, Rhys Christy, Sonya Marshall-Gradisnik

Sonya Marshall-Gradisnik

The blood of two Australian marsupials, the eastern grey kangaroo (Macropus giganteus) and the Tasmanian devil (Sarcophilus harrisii), has been reported to have greater oxygen-carrying capacity (i.e. haemoglobin content) when compared with that of placental mammals. We investigated whether alterations of blood rheological properties are associated with the increased oxygen-carrying capacity of these marsupials. Eastern grey kangaroos (n = 6) and Tasmanian devils (n = 4) were anaesthetised for blood sampling; human blood (n = 6) was also sampled for comparison. Laboratory measurements included blood and plasma viscosity, red blood cell (RBC) deformability, RBC aggregation and the intrinsic tendency of …

Go to article

Differences In Satiety Effects Of Alginate- And Whey Protein-Based Foods, Vicky A. Solah, Deborah A. Kerr, Cynthia D. Adikara, Xingqiong Meng, Colin W. Binns, Kun Zhu, Amanda Devine, Richard L. Prince Jan 2010

Differences In Satiety Effects Of Alginate- And Whey Protein-Based Foods, Vicky A. Solah, Deborah A. Kerr, Cynthia D. Adikara, Xingqiong Meng, Colin W. Binns, Kun Zhu, Amanda Devine, Richard L. Prince

Research outputs pre 2011

Satiety is important in regulating food intake and has important public health significance in the control of obesity. Food containing protein and non-starch polysaccharides provides a satiety effect through various mechanisms but a comparison of the satiety effect on each has not previously been investigated. This study compared the satiety effect or reduction of hunger after consumption of (i) a whey proteinbased drink versus an alginate-based drink of the same viscosity where only the protein content differed, (ii) two alginate-based drinks differing in alginate type and viscosity, and (iii) a whey protein-based drink versus an alginate-based drink differing in protein …

Go to article

Fluorescence Quantum Yield Of Thioflavin T In Rigid Isotropic Solution And Incorporated Into The Amyloid Fibrils, Anna I. Sulatskaya, Alexander A. Maskevich, Irina M. Kuznetsova, Vladimir N. Uversky, Konstantin K. Turoverov Jan 2010

Fluorescence Quantum Yield Of Thioflavin T In Rigid Isotropic Solution And Incorporated Into The Amyloid Fibrils, Anna I. Sulatskaya, Alexander A. Maskevich, Irina M. Kuznetsova, Vladimir N. Uversky, Konstantin K. Turoverov

Molecular Medicine Faculty Publications

In this work, the fluorescence of thioflavin T (ThT) was studied in a wide range of viscosity and temperature. It was shown that ThT fluorescence quantum yield varies from 0.0001 in water at room temperature to 0.28 in rigid isotropic solution (T/η→0). The deviation of the fluorescence quantum yield from unity in rigid isotropic solution suggests that fluorescence quantum yield depends not only on the ultra-fast oscillation of ThT fragments relative to each other in an excited state as was suggested earlier, but also depends on the molecular configuration in the ground state. This means that the fluorescence …

Go to article

A Membrane Cytoskeleton From Dictyostelium Discoideum. I. Identification And Partial Characterization Of An Actin-Binding Activity, Elizabeth J. Luna, V. M. Fowler, J. Swanson, D. Branton, D. L. Taylor Mar 2008

A Membrane Cytoskeleton From Dictyostelium Discoideum. I. Identification And Partial Characterization Of An Actin-Binding Activity, Elizabeth J. Luna, V. M. Fowler, J. Swanson, D. Branton, D. L. Taylor

Elizabeth J. Luna

Dictyostelium discoideum plasma membranes isolated by each of three procedures bind F-actin. The interactions between these membranes and actin are examined by a novel application of falling ball viscometry. Treating the membranes as multivalent actin-binding particles analogous to divalent actin-gelation factors, we observe large increases in viscosity (actin cross-linking) when membranes of depleted actin and myosin are incubated with rabbit skeletal muscle F-actin. Pre-extraction of peripheral membrane proteins with chaotropes or the inclusion of Triton X-100 during the assay does not appreciably diminish this actin cross-linking activity. Lipid vesicles, heat-denatured membranes, proteolyzed membranes, or membranes containing endogenous actin show minimal …

Go to article

An Invitro Leakage And Viscosity Analysis Of Root End Filling Materials, Paul D. Clark Jan 2007

An Invitro Leakage And Viscosity Analysis Of Root End Filling Materials, Paul D. Clark

Theses and Dissertations

The purpose of this study was to determine if the viscosity of MTA Angelus Fluid is lower than that of Pro Root MTA and MTA Angelus; and to compare the viscosity, leakage and particle size of these materials to determine whether a relationship exists between these properties. The viscosity of each material was measured and compared with the Student's t test. MTA Angelus Fluid's viscosity was significantly lower than the other two materials tested. Microleakage of root end fillings was assessed in a passive diffusion model. Leakage groups were compared with a one-way ANOVA (p < 0.05). No significant difference was found. Particle size and shape were evaluated with the SEM. MTA Angelus Fluid has a lower viscosity than the other materials tested. There was no significant difference in the sealing ability of the three materials tested and there was no apparent variation in each material's particle size or shape.

Go to article

Performance And Some Digesta Parameters Of Broiler Chickens Given Low Or High Viscosity Wheat-Based Diets With Or Without Enzyme Supplementation, Mevlüt Günal, Sulhatti̇n Yaşar, John Mike Forbes Jan 2004

Performance And Some Digesta Parameters Of Broiler Chickens Given Low Or High Viscosity Wheat-Based Diets With Or Without Enzyme Supplementation, Mevlüt Günal, Sulhatti̇n Yaşar, John Mike Forbes

Turkish Journal of Veterinary & Animal Sciences

The influence of 2 enzyme supplements for diets based on wheat with high or low viscosity on performance and some intestinal parameters of male broiler chickens were investigated. The experiment was of 2 x 3 factorial design, with 2 types of wheat (high or low viscosity) and 3 enzyme treatments (none, Avizyme 1300-xylanase or Avizyme 1500-amylase). Ileal digesta viscosity was significantly (P < 0.029) higher in birds fed with high viscous wheat than with low viscous wheat. Ileal digesta viscosity (P < 0.001) and dry matter content (P < 0.002) were significantly reduced by both enzyme preparations. Body weight gain, feed intake, dry matter intake, feed conversion ratio, DM retention and wet or dry excreta output were not significantly (P > 0.05) affected by all treatments. There were no significant interactions (P > 0.05) between the effects of wheat type and enzyme supplementation. In conclusion, the supplementation of high or low viscous wheat-based diets with the enzyme preparations of amylase …

Go to article

Submerged And Solid-State Phytase Fermentation By Aspergillus Niger: Effects Of Agitation And Medium Viscosity On Phytase Production, Fungal Morphology And Inoculum Performance, Maria Papagianni, Sue E. Nokes, Keith Filer Jan 2001

Submerged And Solid-State Phytase Fermentation By Aspergillus Niger: Effects Of Agitation And Medium Viscosity On Phytase Production, Fungal Morphology And Inoculum Performance, Maria Papagianni, Sue E. Nokes, Keith Filer

Biosystems and Agricultural Engineering Faculty Publications

Qualitative relationships between agitation levels and medium viscosity, Aspergillus niger morphology and phytase production were investigated in submerged and solid-state fermentations. Overall phytase production increased with increasing shaker speeds from 150 to 300 rpm, although specific growth rates and phytase production rates were higher at 150 rpm for 72 h from inoculation. Fungal morphology was greatly influenced by agitation with the morphological forms of small pellets and entangled mycelia predominating at 150 rpm, while the free filamentous form was obtained at 300 rpm. Upon inoculation of SSF, increased productivities were obtained from inocula grown at 150 rpm. A shift towards …

Go to article