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https://www.readbyqxmd.com/read/28214621/interaction-of-non-aqueous-dispersions-of-silver-nanoparticles-with-cellular-membrane-models
#1
Gustavo Bonomi Soriano, Roselaine da Silva Oliveira, Fernanda Ferraz Camilo, Luciano Caseli
In this work, silver nanoparticles (AgNPs) dispersed in non-aqueous media and stabilized with polyether block polymers amide (PEBA) were incorporated in Langmuir monolayers of dipalmitoylphosphatidylcholine (DPPC), which served as a cell membrane model. The AgNPs presented surface activity, disturbing the viscoelastic properties of the floating film. They expanded the monolayers decreasing their surface elasticity as observed with surface pressure-area isotherms. Polarization modulation reflection-absorption spectroscopy showed that the permanence of AgNPs at the air-water interface is favored by PEBA, affecting both the hydrophilic and the hydrophobic groups of the phospholipid...
February 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28213985/capillary-dynamics-driven-by-molecular-self-layering
#2
Pingkeng Wu, Alex Nikolov, Darsh Wasan
Capillary dynamics is a ubiquitous everyday phenomenon. It has practical applications in diverse fields, including ink-jet printing, lab-on-a-chip, biotechnology, and coating. Understanding capillary dynamics requires essential knowledge on the molecular level of how fluid molecules interact with a solid substrate (the wall). Recent studies conducted with the surface force apparatus (SFA), atomic force microscope (AFM), and statistical mechanics simulation revealed that molecules/nanoparticles confined into the film/wall surfaces tend to self-layer into 2D layer/s and even 2D in-layer with increased confinement and fluid volume fraction...
February 10, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28213338/a-uniaxial-cyclic-compression-method-for-characterizing-the-rheological-and-textural-behaviors-of-mechanically-dewatered-sewage-sludge
#3
Fenglin Liang, Martial Sauceau, Gilles Dusserre, Patricia Arlabosse
The mechanically dewatered sewage sludge with total solid content around 20% on a weight basis is very similar to yield stress fluid, its complex transition between solid and fluid states is not perfectly reversible and especially challenging in terms of pumping, land spreading and drying. To characterize the rheological and textural properties of highly concentrated sludge, a specific methodology based on uniaxial single and cyclic compression tests is developed. Three types of sludge samples (fresh original, fresh premixed and aged original ones) are extruded into cylinders and pressed between two parallel plates using a material testing machine...
February 7, 2017: Water Research
https://www.readbyqxmd.com/read/28212934/effects-of-basil-seed-gum-cress-seed-gum-and-quince-seed-gum-on-the-physical-textural-and-rheological-properties-of-whipped-cream
#4
Reza Farahmandfar, Maryam Asnaashari, Reza Salahi, Tandis Khosravi Rad
This study focuses on the physical, textural and rheological properties of low fat (LF) whipped cream with 30% fat content developed with Basil seed gum (BSG), Cress seed gum (CSG) and Quince seed gum (QSG) at the concentration of 0.1 and 0.3% (wt/wt) and comparison with high fat (HF) whipped cream sample (55%) as control. Flow curves were analyzed using Herschel bulkey and Carreau models through a fitting procedure. The rheological investigations confirmed that all samples were shear thinning fluid exhibiting a yield stress and thixotropy properties...
February 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28211715/liquid-grain-mixing-suppresses-droplet-spreading-and-splashing-during-impact
#5
Song-Chuan Zhao, Rianne de Jong, Devaraj van der Meer
Would a raindrop impacting on a coarse beach behave differently from that impacting on a desert of fine sand? We study this question by a series of model experiments, where the packing density of the granular target, the wettability of individual grains, the grain size, the impacting liquid, and the impact speed are varied. We find that by increasing the grain size and/or the wettability of individual grains the maximum droplet spreading undergoes a transition from a capillary regime towards a viscous regime, and splashing is suppressed...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28210726/exploring-the-interaction-of-phenothiazinium-dyes-methylene-blue-new-methylene-blue-azure-a-and-azure-b-with-trna-phe-spectroscopic-thermodynamic-voltammetric-and-molecular-modeling-approach
#6
Puja Paul, Soumya Sundar Mati, Subhash Chandra Bhattacharya, Gopinatha Suresh Kumar
This study focuses on the understanding of the interaction of phenothiazinium dyes methylene blue (MB), new methylene blue (NMB), azure A (AZA) and azure B (AZB) with tRNA(Phe) with particular emphasis on deciphering the mode and energetics of the binding. Strong intercalative binding to tRNA(Phe) was observed for MB, NMB and AZB, bound by a partial intercalative mode. AZA has shown groove binding characteristics. From spectroscopic studies binding affinity values of the order of 10(5) M(-1) were deduced for these dyes; the trend varied as MB > NMB > AZB > AZA...
February 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28210718/synthesis-and-epr-spectroscopic-characterization-of-the-perchlorotriarylmethyl-tricarboxylic-acid-radical-ptmtc-and-its-13-c-labelled-analogue-13c-ptmtc
#7
Marwa Elewa, Nadica Maltar-Strmečki, Mohamed M Said, Hosam A El Shihawy, Mohamed El-Sadek, Juliane Frank, Simon Drescher, Malte Drescher, Karsten Mäder, Dariush Hinderberger, Peter Imming
A hydrophilic tris(tetrachlorotriaryl)methyl (tetrachloro-TAM) radical labelled 50% with (13)C at the central carbon atom was prepared. The mixture of isotopologue radicals was characterised by continuous wave and pulsed X-band electron paramagnetic spectroscopy (EPS). For the pharmaceutical and medical applications planned, the quantitative influence of oxygen, viscosity, temperature and pH on EPR line widths was studied in aqueous buffer, DMSO, water-methanol and water-glycerol mixtures. Under in vivo conditions, pH can be disregarded...
February 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28208830/cefdinir-solid-dispersion-composed-of-hydrophilic-polymers-with-enhanced-solubility-dissolution-and-bioavailability-in-rats
#8
Hyun-Jong Cho, Jun-Pil Jee, Ji-Ye Kang, Dong-Yeop Shin, Han-Gon Choi, Han-Joo Maeng, Kwan Hyung Cho
The aim of this work was to develop cefdinir solid dispersions (CSDs) prepared using hydrophilic polymers with enhanced dissolution/solubility and in vivo oral bioavailability. CSDs were prepared with hydrophilic polymers such as hydroxypropyl-methylcellulose (HPMC; CSD1), carboxymethylcellulose-Na (CMC-Na; CSD2), polyvinyl pyrrolidone K30 (PVP K30; CSD3) at the weight ratio of 1:1 (drug:polymer) using a spray-drying method. The prepared CSDs were characterized by aqueous solubility, differential scanning calorimetry (DSC), powder X-ray diffraction (p-XRD), scanning electron microscopy (SEM), aqueous viscosity, and dissolution test in various media...
February 13, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28208666/the-mechanisms-and-biomedical-applications-of-an-nir-bodipy-based-switchable-fluorescent-probe
#9
Bingbing Cheng, Venugopal Bandi, Shuai Yu, Francis D'Souza, Kytai T Nguyen, Yi Hong, Liping Tang, Baohong Yuan
Highly environment-sensitive fluorophores have been desired for many biomedical applications. Because of the noninvasive operation, high sensitivity, and high specificity to the microenvironment change, they can be used as excellent probes for fluorescence sensing/imaging, cell tracking/imaging, molecular imaging for cancer, and so on (i.e., polarity, viscosity, temperature, or pH measurement). In this work, investigations of the switching mechanism of a recently reported near-infrared environment-sensitive fluorophore, ADP(CA)₂, were conducted...
February 11, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28208391/band-instability-in-near-critical-fluids-subjected-to-vibration-under-weightlessness
#10
T Lyubimova, A Ivantsov, Y Garrabos, C Lecoutre, G Gandikota, D Beysens
Periodical patterns (bands) developing at the interface of two immiscible fluids under vibration parallel to interface are observed under zero-gravity conditions. Fluids are slightly below their liquid-vapor critical point where they behave in a scaled, universal manner. In addition, liquid and vapor densities are close and surface tension is very low. Linear stability analyses and direct numerical simulation show that this instability, although comparable to the frozen wave instability observed in a gravity field, is nonetheless noticeably different when gravity becomes zero...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208340/scaling-features-of-the-tribology-of-polymer-brushes-of-increasing-grafting-density-around-the-mushroom-to-brush-transition
#11
E Mayoral, J Klapp, A Gama Goicochea
Nonequilibrium coarse-grained, dissipative particle dynamics simulations of complex fluids, made up of polymer brushes tethered to planar surfaces immersed in a solvent yield nonmonotonic behavior of the friction coefficient as a function of the polymer grating density on the substrates, Γ, while the viscosity shows a monotonically increasing dependence on Γ. This effect is shown to be independent of the degree of polymerization, N, and the size of the system. It arises from the composition and the structure of the first particle layer adjacent to each surface that results from the confinement of the fluid...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28207231/7-approaches-to-elimination-of-the-inherent-systematic-errors-in-determination-of-electrophoretic-mobility-by-capillary-electrophoresis
#12
Paweł Mateusz Nowak, Michał Woźniakiewicz, Pawel Koscielniak
Electrophoretic mobility is a basic parameter describing the electromigration of an ionized particle, which is used in many fields of analytical and physicochemical science. Its determination by capillary electrophoresis (CE) using a routine method is intrinsically affected by the generation of Joule heating, entailing a drop in viscosity and possible alteration of the degree of ionization, and also by other commonly overlooked effects: axial electric field distortion and voltage ramping. The aim of this work was to provide the first theoretical overview and experimental comparison of all accessible methods that could be used to prevent these sources of inaccuracy...
February 16, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28203644/optimization-of-the-functional-characteristics-pasting-and-rheological-properties-of-pearl-millet-based-composite-flour
#13
Olugbenga Olufemi Awolu
Optimisation of composite flour comprising pearl millet, kidney beans and tigernut with xanthan gum was evaluated for rheological evaluations. The functional properties of the composite flour were optimized using optimal design of response surface methodology. The optimum blends, defined as blends with overall best functional characteristics were run 3 (75.956% pearl millet, 17.692% kidney beans, 6.352% tigernut flours), run 7 (85.000% pearl millet, 10.000% kidney beans, 5.000% tigernut flours) and run 13 (75...
February 2017: Heliyon
https://www.readbyqxmd.com/read/28202730/liquid-behavior-of-cross-linked-actin-bundles
#14
Kimberly L Weirich, Shiladitya Banerjee, Kinjal Dasbiswas, Thomas A Witten, Suriyanarayanan Vaikuntanathan, Margaret L Gardel
The actin cytoskeleton is a critical regulator of cytoplasmic architecture and mechanics, essential in a myriad of physiological processes. Here we demonstrate a liquid phase of actin filaments in the presence of the physiological cross-linker, filamin. Filamin condenses short actin filaments into spindle-shaped droplets, or tactoids, with shape dynamics consistent with a continuum model of anisotropic liquids. We find that cross-linker density controls the droplet shape and deformation timescales, consistent with a variable interfacial tension and viscosity...
February 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28202131/how-irreversible-adsorption-affects-interfacial-properties-of-polymers
#15
REVIEW
Simone Napolitano, Michele Sferrazza
Growing experimental evidence shows that the behavior of polymer chains confined at the nanoscale level strongly depends on the degree of adsorption correlated to the number density of monomers pinned onto the supporting substrate. In this contribution, after introducing the physics behind the mechanisms of irreversible adsorption, we review recent experimental observations on how adsorption affects properties of polymer melts confined in 1D, focusing on those related to the thermal glass transition, maximum water uptake, viscosity and crystallization...
February 9, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28201934/feeding-value-of-field-beans-vicia-faba-l-var-minor-with-and-without-enzyme-containing-tannase-pectinase-and-xylanase-activities-for-broilers
#16
Jalil Mahmwd Abdulla, Stephen Paul Rose, Alexander Mackay Mackenzie, Vasil Radoslavov Pirgozliev
Effects of field beans with various tannin content and exogenous enzyme mixture containing tannase, pectinase and xylanase activities on N-corrected dietary apparent metabolisable energy (AMEn), coefficients of dry matter (DMR) and nitrogen retention (NR), fat digestibility, gastrointestinal tract (GIT) development, jejunal villus morphometry, ileal digesta viscosity and sialic acid were examined. Birds' growth performance and energy conversion ratio (ECR) were also measured. Birds were fed one of eight mash diets...
April 2017: Archives of Animal Nutrition
https://www.readbyqxmd.com/read/28201873/insights-into-the-formation-and-structures-of-starch-protein-lipid-complexes
#17
Shujun Wang, Mengge Zheng, Jinglin Yu, Shuo Wang, Les Copeland
The aim of the present study was to characterize the multi-scale structures of ternary complexes of a model system of starch, fatty acid (FA) and β-lactoglobulin (βLG) prepared using a Rapid Visco Analyser (RVA). The addition of βLG to starch-lauric acid or starch-oleic acid RVA pastes resulted in the increased intensity or occurrence of a new viscosity peak during cooling when the RVA protocol was repeated. The viscosity peak was attributed to the formation of starch-βLG-FA complexes. Differential scanning calorimetry (DSC) results showed clearly that starch-βLG-FAs complex was formed as gelatinized starch was cooled in the presence of βLG and FAs...
February 15, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28199952/biopolymer-gold-nanoparticles-composite-plasmonic-thermal-history-indicator-to-monitor-quality-and-safety-of-perishable-bioproducts
#18
Yi-Cheng Wang, Lin Lu, Sundaram Gunasekaran
Quality and safety of perishable products such as foods, pharmaceutics, and biologicals is a constant concern. We have developed a plasmonic thermal history indicator (THI) taking advantage of the localized surface plasmon resonance of gold nanoparticles (AuNPs) synthesized in situ in alginate, a natural polysaccharide. The color of the THIs becomes more intense with increased storage temperature and/or duration, with the color changing from grey to red with time of exposure at high temperature (40°C). The results suggest that decreasing viscosity with increasing number of AuNPs being synthesized in the system, along with aggregation of newly synthesized AuNPs onto larger ones and their settling are potentially responsible for the distinct color change observed...
January 26, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28198930/eugenics-in-buenos-aires-discourses-practices-and-historiography
#19
Diego Armus
Since the early 1990s, a series of studies underscored the overwhelming presence of positive eugenics in modern Argentina. These works emphasized the marginal role which discourse on eugenics took on violent methods for selection. In recent years, this point of view has shifted, emphasizing the conceptual viscosity of eugenics as well as the presence of negative eugenic discourses. This paper discusses these historiographic trends, and also dwells on the narratives that those perspectives articulated in relation to the question of sterilization and regulation of marriage of those who had tuberculosis in Buenos Aires during the first half of the twentieth century...
December 2016: História, Ciências, Saúde—Manguinhos
https://www.readbyqxmd.com/read/28198895/understanding-the-drop-impact-on-moving-hydrophilic-and-hydrophobic-surfaces
#20
H Almohammadi, A Amirfazli
In this paper, a systematic study was performed to understand the drop impact on hydrophilic and hydrophobic surfaces that were moving in the horizontal direction. Drops (D0 = 2.5 mm) of liquids with three different viscosities were used. Wide ranges of drop normal velocity (0.5 to 3.4 m s(-1)) and surface velocity (0 to 17 m s(-1)) were studied. High speed imaging from the top and side was used to capture the impact phenomena. It was found that drop impact behavior on a moving surface significantly differs from that on a stationary surface at both the lamella extension stage (i...
February 15, 2017: Soft Matter
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