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https://www.readbyqxmd.com/read/29988935/dynamic-interfacial-tension-measurement-method-using-axisymmetric-drop-shape-analysis
#1
Nikhil Bagalkot, Aly A Hamouda, Ole Morten Isdahl
The current method describes a simple modification to the dynamic and equilibrium interfacial tension (IFT) measurement in a multiphase system (gas-liquid/liquid-liquid) by the Axisymmetric Drop Shape Analysis (ADSA) pendant drop technique. The primary difficulty associated with dynamic IFT measurement by ADSA is providing the appropriate phase densities, especially in a system consisting of gas (CO2 , methane, and propane) and liquids (water and hydrocarbon). The density of the phases is calculated using a, considering the solubility og gases in liquids, as a function of time...
2018: MethodsX
https://www.readbyqxmd.com/read/29847136/droplet-oscillation-as-an-arbitrary-waveform-generator
#2
Kyle Yu, Jinlong Yang, Yi Y Zuo
Oscillating droplets and bubbles have been developed into a novel experimental platform for a wide range of analytical and biological applications, such as digital microfluidics, thin film, biophysical simulation, and interfacial rheology. A central effort of developing any droplet-based experimental platform is to increase the effectiveness and accuracy of droplet oscillations. Here, we developed a novel system of droplet-based arbitrary waveform generator (AWG) for feedback-controlling single-droplet oscillations...
June 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29720528/invasive-methicillin-resistant-staphylococcus-aureus-usa500-strains-from-the-u-s-emerging-infections-program-constitute-three-geographically-distinct-lineages
#3
M B Frisch, S Castillo-Ramírez, R A Petit, M M Farley, S M Ray, V S Albrecht, B M Limbago, J Hernandez, I See, S W Satola, T D Read
USA500 isolates are clonal complex 8 (CC8) Staphylococcus aureus strains closely related to the prominent community- and hospital-associated USA300 group. Despite being relatively understudied, USA500 strains cause a significant burden of disease and are the third most common methicillin-resistant S. aureus (MRSA) strains identified in the U.S. Emerging Infections Program (EIP) invasive S. aureus surveillance. To better understand the genetic relationships of the strains, we sequenced the genomes of 539 USA500 MRSA isolates from sterile site infections collected through the EIP between 2005 and 2013 in the United States...
May 2018: MSphere
https://www.readbyqxmd.com/read/29705428/adsa-foundation-scholar-award-a-role-for-serotonin-in-lactation-physiology-where-do-we-go-from-here
#4
L L Hernandez
Lactation is a physiological event that is exclusive to mammals. Lactation evolved as a strategy to improve the survival of the young by providing them with the complete nutrition that is required for survival upon birth as well as maternal-offspring bonding. Typically, milk production by the dam matches the demand of the young. The dairy cow is a unique exception in which the discoveries and genetic selection related to lactation physiology have been applied and resulted in a dramatic increase in milk yield of dairy cows...
July 2018: Journal of Dairy Science
https://www.readbyqxmd.com/read/29565138/melting-of-the-dipalmitoylphosphatidylcholine-monolayer
#5
Lu Xu, Gordon Bosiljevac, Kyle Yu, Yi Y Zuo
Langmuir monolayer self-assembled at the air-water interface represents an excellent model for studying phase transition and lipid polymorphism in two dimensions. Compared with numerous studies of phospholipid phase transitions induced by isothermal compression, there are very scarce reports on two-dimensional phase transitions induced by isobaric heating. This is mainly due to technical difficulties of continuously regulating temperature variations while maintaining a constant surface pressure in a classical Langmuir-type film balance...
April 17, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29439939/need-for-gender-sensitive-health-system-responses-to-violence-against-women-and-children
#6
LETTER
Adsa Fatima, Aarthi Chandrasekhar, Amita Pitre
Five years since Nirbhaya, and nearly as long since the Justice Verma Committee Report, amendments to the Criminal Law Amendment Act 2013, and the National guidelines and protocols on medico-legal care for survivors of sexual violence by the Ministry of Health and Family Welfare (MoHFW) 2014, we, concerned individuals, women's groups, health organisations, ethicists, and academicians, urgently demand the attention of the central and state governments - to the continuing injustice, violations and discrimination against survivors of gender-based violence (GBV)...
July 2018: Indian Journal of Medical Ethics
https://www.readbyqxmd.com/read/29153176/adsa%C3%A2-presidential-report
#7
Lou Armentano
No abstract text is available yet for this article.
December 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28793193/accuracy-of-axisymmetric-drop-shape-analysis-in-determining-surface-and-interfacial-tensions
#8
Jinlong Yang, Kyle Yu, Yi Y Zuo
Axisymmetric drop shape analysis (ADSA) has been used in a broad range of applications for determining surface tensions of air-liquid surfaces and interfacial tensions of liquid-liquid interfaces. However, it is well-known that the accuracy of ADSA deteriorates upon the reduction of drop volume. Here, we systematically compared different criteria and parameters in evaluating the accuracy of ADSA upon reducing drop volume. By scrutinizing the dependence of ADSA accuracy on various parameters, including the capillary constant (c), the Bond number (Bo), the Worthington number (Wo), and the shape parameter (Ps ), we concluded that the classical Bond number failed to predict the accuracy of drop shape analysis at very small drop volumes...
September 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28664946/the-influence-of-polyanion-molecular-weight-on-polyelectrolyte-multilayers-at-surfaces-elasticity-and-susceptibility-to-saloplasticity-of-strongly-dissociated-synthetic-polymers-at-fluid-fluid-interfaces
#9
Ashley D Cramer, Wen-Fei Dong, Natalie L Benbow, Jessie L Webber, Marta Krasowska, David A Beattie, James K Ferri
We studied the interfacial mechanical properties of polyelectrolyte multilayer assemblies of poly(diallylamine hydrochloride) (PAH) and poly(4-styrenesulfonate)sodium salt (PSS) at the air-water interface using axisymmetric drop shape analysis (ADSA) during hydrostatic inflation as a function of aqueous salt concentration and two different polyanion molecular weights (Mw ∼ 13 and 70 kDa). Surface elastic moduli (Gs ) ranged from 50 to 300 mN m-1 . Using the measured film thickness, the bulk moduli (G) ranged from 10 to 90 MPa consistent with elastomeric solids...
September 13, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28633319/immunotherapy-targeting-adenosine-synthase-a-decreases-severity-of-staphylococcus-aureus-infection-in-mouse-model
#10
Bao-Zhong Zhang, JianPiao Cai, Bin Yu, Lifeng Xiong, Qiubin Lin, Xiao-Yan Yang, Chen Xu, SongYue Zheng, Richard Yi-Tsun Kao, Konghung Sze, Kwok-Yung Yuen, Jian-Dong Huang
Staphylococcusaureus is a severe pathogen found in the community and in hospitals. Most notably, methicillin-resistant S. aureus (MRSA) is resistant to almost all antibiotics, which is a growing public health concern. The emergence of drug-resistant strains has prompted the search for alternative treatments such as immunotherapeutic approaches. Previous research showed that S. aureus exploit the immunomodulatory attributes of adenosine to escape host immunity. In this study, we investigated adenosine synthase A (AdsA), an S...
July 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28468124/temporal-evolution-of-ultrafine-particles-and-of-alveolar-deposited-surface-area-from-main-indoor-combustion-and-non-combustion-sources-in-a-model-room
#11
Maurizio Manigrasso, Matteo Vitali, Carmela Protano, Pasquale Avino
Aerosol number size distributions, PM mass concentrations, alveolar deposited surface areas (ADSAs) and VOC concentrations were measured in a model room when aerosol was emitted by sources frequently encountered in indoor environments. Both combustion and non-combustion sources were considered. The most intense aerosol emission occurred when combustion sources were active (as high as 4.1×107 particlescm-3 for two meat grilling sessions; the first with exhaust ventilation, the second without). An intense spike generation of nucleation particles occurred when appliances equipped with brush electric motors were operating (as high as 106 particlescm-3 on switching on an electric drill)...
November 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28190931/pendant-drop-method-coupled-to-ultraviolet-visible-spectroscopy-a-useful-tool-to-investigate-interfacial-phenomena
#12
Marco A R Andrade, Bruno Favarin, Rafael Derradi, Mayte Bolean, Ana Maria S Simão, José Luis Millán, Pietro Ciancaglini, Ana P Ramos
UV-vis spectroscopy is a powerful tool to investigate surface phenomena. Surface tension measurements coupled to spectroscopic techniques can help to elucidate how the interface organization influences the electronic properties of molecules. However, appreciable sample volumes are usually necessary to achieve strong signals during conduction of experiments. This study reports on the simultaneous acquisition of surface tension data and UV-vis spectra by axisymmetric drop shape analysis (ADSA) coupled to diffuse reflectance (DRUV) spectrophotometry using a pendant microliter-drop that requires small sample volumes and low analyte concentrations...
September 5, 2016: Colloids and Surfaces. A, Physicochemical and Engineering Aspects
https://www.readbyqxmd.com/read/27855787/axisymmetric-drop-shape-analysis-adsa-an-outline
#13
REVIEW
Sameh M I Saad, A Wilhelm Neumann
Drop shape techniques for the measurement of interfacial tension are powerful, versatile and flexible. The shape of the drop/bubble depends on the balance between surface tension and external forces, e.g. gravity. This balance is reflected mathematically in the Laplace equation of capillarity. Axisymmetric Drop Shape Analysis (ADSA) is a commonly used drop shape technique. A streamlined version of the development of ADSA over the past several decades is presented to illustrate its validity and range of utility...
December 2016: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/27616064/effect-of-surfactants-on-surface-activity-and-rheological-properties-of-type-i-collagen-at-air-water-interface
#14
Aleksandra Kezwoń, Ilona Góral, Tomasz Frączyk, Kamil Wojciechowski
We describe the effect of three synthetic surfactants (anionic - sodium dodecyl sulfate (SDS), cationic - cetyltrimethylammonium bromide (CTAB) and nonionic - Triton X-100 (TX-100)) on surface properties of the type I calf skin collagen at the air/water interface in acidic solutions (pH 1.8). The protein concentration was fixed at 5×10(-6)molL(-1) and the surfactant concentration was varied in the range 5×10(-6)molL(-1)-1×10(-4)molL(-1), producing the protein/surfactant mixtures with molar ratios of 1:1, 1:2, 1:5, 1:10 and 1:20...
December 1, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27132978/automated-droplet-manipulation-using-closed-loop-axisymmetric-drop-shape-analysis
#15
Kyle Yu, Jinlong Yang, Yi Y Zuo
Droplet manipulation plays an important role in a wide range of scientific and industrial applications, such as synthesis of thin-film materials, control of interfacial reactions, and operation of digital microfluidics. Compared to micron-sized droplets, which are commonly considered as spherical beads, millimeter-sized droplets are generally deformable by gravity, thus introducing nonlinearity into control of droplet properties. Such a nonlinear drop shape effect is especially crucial for droplet manipulation, even for small droplets, at the presence of surfactants...
May 17, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/26433933/age-dependent-gait-abnormalities-in-mice-lacking-the-rnf170-gene-linked-to-human-autosomal-dominant-sensory-ataxia
#16
Youngsoo Kim, Seong Hun Kim, Kook Hwan Kim, Sujin Chae, Chanki Kim, Jeongjin Kim, Hee-Sup Shin, Myung-Shik Lee, Daesoo Kim
Really interesting new gene (RING) finger protein 170 (RNF170) is an E3 ubiquitin ligase known to mediate ubiquitination-dependent degradation of type-I inositol 1,4,5-trisphosphate receptors (ITPR1). It has recently been demonstrated that a point mutation of RNF170 gene is linked with autosomal-dominant sensory ataxia (ADSA), which is characterized by an age-dependent increase of walking abnormalities, a rare genetic disorder reported in only two families. Although this mutant allele is known to be dominant, the functional identity thereof has not been clearly established...
December 20, 2015: Human Molecular Genetics
https://www.readbyqxmd.com/read/26046164/south-african-food-allergy-consensus-document-2014
#17
M E Levin, C L Gray, E Goddard, S Karabus, M Kriel, A C Lang, A I Manjra, S M Risenga, A J Terblanche, D A van der Spuy
The prevalence of food allergy is increasing worldwide and is an important cause of anaphylaxis. There are no local South African food allergy guidelines. This document was devised by the Allergy Society of South Africa (ALLSA), the South African Gastroenterology Society (SAGES) and the Association for Dietetics in South Africa (ADSA). Subjects may have reactions to more than one food, and different types and severity of reactions to different foods may coexist in one individual. A detailed history directed at identifying the type and severity of possible reactions is essential for every food allergen under consideration...
January 2015: South African Medical Journal, Suid-Afrikaanse Tydskrif Vir Geneeskunde
https://www.readbyqxmd.com/read/25919815/adsorption-of-surface-modified-silica-nanoparticles-to-the-interface-of-melt-poly-lactic-acid-and-supercritical-carbon-dioxide
#18
K Sarikhani, K Jeddi, R B Thompson, C B Park, P Chen
With the purpose of fabricating polymer nanocomposite foams and preventing coalescence in foaming processes, the interfacial tension of poly(lactic acid) (PLA)-silica composites is investigated in this work. Synthesized silica nanoparticles (SNs) with a CO2-philic surface modification are used as the dispersed nanoparticles. Interfacial tension is a key parameter in processing of polymer foams since it directly affects the final foam properties, such as cell size and cell density. Interfacial tension of silica-containing PLA and supercritical carbon dioxide (CO2) is measured using axisymmetric drop shape analysis profile (ADSA-P) pendant drop method at high pressures and high temperatures...
May 26, 2015: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/25904549/staphylococcus-aureus-adenosine-inhibits-spla2-iia-mediated-host-killing-in-the-airways
#19
Erwan Pernet, Jérémy Brunet, Laurent Guillemot, Michel Chignard, Lhousseine Touqui, Yongzheng Wu
Staphylococcus aureus is a common cause of bacterial infections in respiratory diseases. It secretes molecules to dampen host immunity, and the recently identified adenosine is one of these molecules. The type IIA secretory phospholipase A2 (sPLA2-IIA) is a host protein endowed with antibacterial properties, especially against Gram-positive bacteria such as S. aureus. However, the role of adenosine in sPLA2-IIA-mediated S. aureus killing by host is still unknown. The present studies showed that the S. aureus mutant lacking adenosine production (∆adsA strain) increased sPLA2-IIA expression in guinea pig airways and was cleared more efficiently, compared with the wild-type strain...
June 1, 2015: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/25882839/a-point-mutation-in-the-ubiquitin-ligase-rnf170-that-causes-autosomal-dominant-sensory-ataxia-destabilizes-the-protein-and-impairs-inositol-1-4-5-trisphosphate-receptor-mediated-ca2-signaling
#20
Forrest A Wright, Justine P Lu, Danielle A Sliter, Nicolas Dupré, Guy A Rouleau, Richard J H Wojcikiewicz
RNF170 is an endoplasmic reticulum membrane ubiquitin ligase that contributes to the ubiquitination of activated inositol 1,4,5-trisphosphate (IP3) receptors, and also, when point mutated (arginine to cysteine at position 199), causes autosomal dominant sensory ataxia (ADSA), a disease characterized by neurodegeneration in the posterior columns of the spinal cord. Here we demonstrate that this point mutation inhibits RNF170 expression and signaling via IP3 receptors. Inhibited expression of mutant RNF170 was seen in cells expressing exogenous RNF170 constructs and in ADSA lymphoblasts, and appears to result from enhanced RNF170 autoubiquitination and proteasomal degradation...
May 29, 2015: Journal of Biological Chemistry
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