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https://www.readbyqxmd.com/read/28735449/therapy-with-omeprazole-modulates-regulatory-t-cell-t-helper-17-immune-response-in-children-with-duodenal-ulcers
#1
Chuan-Ying Li, Cheng Wu
The purpose of this study was to determine the effect of omeprazole on the regulatory T cell (Treg) and T helper 17 (Th17)-mediated response in patients with duodenal ulcers (DUs). DU patients were randomly divided into omeprazole and colloid bismuth subcitrate treatment groups. The ratios of Th17 and Treg in peripheral blood mononuclear cells (PBMCs) were measured. Cytokine production and Foxp3(+)- and RORγt-positive cells were detected. The expressions of STAT3, p-STAT3, STAT5 and p-STAT5 were detected by Western blot...
July 22, 2017: Inflammopharmacology
https://www.readbyqxmd.com/read/28734358/fluorescent-quenching-immune-chromatographic-strips-with-quantum-dots-and-upconversion-nanoparticles-as-fluorescent-donors-for-visual-detection-of-sulfaquinoxaline-in-foods-of-animal-origin
#2
Gaoshuang Hu, Wei Sheng, Jingmin Li, Yan Zhang, Junping Wang, Shuo Wang
In this study, two novel fluorescence quenching immune chromatographic strips (FQICS) were developed to detect sulfaquinoxaline (SQX) in foods of animal origin. These proposed FQICSs were based on fluorescence resonance energy transfer (FRET) from fluorescence donors (quantum dots or upconversion nanoparticles) to fluorescence acceptors (colloidal gold nanoparticles). Compared with traditional colloidal gold-based immune chromatographic strips (ICS), these FQICSs showed positive correlation between the fluorescent signals and the targets, and allowed user to get test results from weak fluorescent signals...
August 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28733618/cellular-interfaces-with-hydrogen-bonded-organic-semiconductor-hierarchical-nanocrystals
#3
Mykhailo Sytnyk, Marie Jakešová, Monika Litviňuková, Oleksandr Mashkov, Dominik Kriegner, Julian Stangl, Jana Nebesářová, Frank W Fecher, Wolfgang Schöfberger, Niyazi Serdar Sariciftci, Rainer Schindl, Wolfgang Heiss, Eric Daniel Głowacki
Successful formation of electronic interfaces between living cells and semiconductors hinges on being able to obtain an extremely close and high surface-area contact, which preserves both cell viability and semiconductor performance. To accomplish this, we introduce organic semiconductor assemblies consisting of a hierarchical arrangement of nanocrystals. These are synthesised via a colloidal chemical route that transforms the nontoxic commercial pigment quinacridone into various biomimetic three-dimensional arrangements of nanocrystals...
July 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28733002/aggregation-kinetics-of-single-walled-carbon-nanotubes-influenced-by-the-frequency-of-ultrasound-irradiation-in-the-aquatic-environment
#4
Chang Min Park, Yasir A J Al-Hamadani, Jiyong Heo, Namguk Her, Kyoung Hoon Chu, Min Jang, Sangho Lee, Yeomin Yoon
The colloidal stability of single-walled carbon nanotubes (SWNTs) sonicated at three different ultrasonication (US) frequencies (28, 580, and 1000kHz) were investigated under environmentally relevant conditions. In particular, correlations between surface chemistry, electrokinetic potential, interaction energy, and the aggregation kinetics of the aqueous SWNTs were studied. We observed that H2O2 production is negatively correlated with the yield of hydroxylation and carboxylation of SWNTs, which was dependent on the generation of ultrasonic energy by cavity collapse during US process...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732963/ultrasonic-assisted-synthesis-of-znte-nanostructures-and-their-structural-electrochemical-and-photoelectrical-properties
#5
P Ilanchezhiyan, G Mohan Kumar, Fu Xiao, S Poongothai, A Madhan Kumar, C Siva, Sh U Yuldashev, D J Lee, Y H Kwon, T W Kang
Colloidal zinc telluride (ZnTe) nanostructures were successfully processed through a simple and facile ultrasonic (sonochemical) treatment for photoelectronic applications. The particle-like morphological features, phase and nature of valence state of various metal ions existing in ZnTe were examined using electron and X-ray photoelectron spectroscopic tools. Raman spectroscopic measurements revealed the dominance of exciton-phonon coupling and occurrence of TeO2 traces in ZnTe through the corresponding vibrations...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732930/transglutaminase-set-colloidal-properties-of-wheat-gluten-with-ultrasound-pretreatments
#6
Xin-Sheng Qin, Qiao-Qiao Sun, Yan-Yan Zhao, Xi-Yang Zhong, Dong-Dong Mu, Shao-Tong Jiang, Shui-Zhong Luo, Zhi Zheng
The low solubility of wheat gluten limits its accessibility. This work aimed to study the impact of ultrasonic pretreatments on the gelation of wheat gluten. The pretreatments included ultrasound combined with alkali, urea, Na2SO3, with or without the addition of transglutaminase (TGase). The gel strength of wheat gluten was 287g/cm(2) after treatment with Na2SO3/ultrasound/TGase. The free sulfhydryl and disulfide bond content was significantly affected by ultrasound treatment. After treatments including TGase crosslinking, the molecular weight of wheat gluten complexes became larger...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732162/dynamical-design-of-spatial-patterns-of-colloidal-suspensions
#7
Nuno Am Araujo, Dmitry Zezyulin, Vladimir Konotop, Margarida M Telo da Gama
We study the collective dynamics of colloidal suspensions in the presence of a time-dependent potential, by means of dynamical density functional theory. We consider a non-linear diffusion equation for the density and show that spatial patterns emerge from a sinusoidal external potential with a time-dependent wavelength. These patterns are characterized by a sinusoidal density with the average wavelength and a Bessel-function envelope with an induced wavelength that depends only on the amplitude of the temporal oscillations...
July 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28732010/biofilm-imaging-in-porous-media-by-laboratory-x-ray-tomography-combining-a-non-destructive-contrast-agent-with-propagation-based-phase-contrast-imaging-tools
#8
Maxence Carrel, Mario A Beltran, Verónica L Morales, Nicolas Derlon, Eberhard Morgenroth, Rolf Kaufmann, Markus Holzner
X-ray tomography is a powerful tool giving access to the morphology of biofilms, in 3D porous media, at the mesoscale. Due to the high water content of biofilms, the attenuation coefficient of biofilms and water are very close, hindering the distinction between biofilms and water without the use of contrast agents. Until now, the use of contrast agents such as barium sulfate, silver-coated micro-particles or 1-chloronaphtalene added to the liquid phase allowed imaging the biofilm 3D morphology. However, these contrast agents are not passive and potentially interact with the biofilm when injected into the sample...
2017: PloS One
https://www.readbyqxmd.com/read/28731771/colloidal-spherocylinders-at-an-interface-flipper-dynamics-and-bilayer-formation
#9
T Li, G Brandani, D Marenduzzo, P S Clegg
We study the response of a film of colloidal spherocylinders to compression by combining pressure-area isotherm measurements, microscopy, and computer simulations. We find that the behavior of the film depends strongly on the geometry of the particles. For a small aspect ratio, a uniform monolayer forms and then buckles. For a higher aspect ratio, particles flip to orient perpendicular to the interface; we show that flipping occurs in locations where the nematic ordering is low. Our experiments and simulations further demonstrate that the longest particles rearrange to self-assemble a colloidal bilayer, which is stable due to the unique geometry of spherocylinders at an interface...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28731768/self-organized-velocity-pulses-of-dense-colloidal-suspensions-in-microchannel-flow
#10
Philipp Kanehl, Holger Stark
We present a numerical study of dense colloidal suspensions in a pressure-driven microchannel flow in two dimensions. The colloids are modeled as elastic and frictional spheres suspended in a Newtonian fluid, which we simulate using the method of multiparticle collision dynamics. The model reproduces periodic velocity and density pulse trains, traveling upstream in the microchannel, which are found in experiments conducted by Isa et al. [Phys. Rev. Lett. 102, 058302 (2009)PRLTAO0031-900710.1103/PhysRevLett...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28731356/preparation-of-colloidal-organosilica-spheres-through-spontaneous-emulsification
#11
Casper van der Wel, Rohit K Bhan, Ruben W Verweij, Hans C Frijters, Zhe Gong, Andrew D Hollingsworth, Stefano Sacanna, Daniela J Kraft
Colloidal particles of controlled size are promising building blocks for self-assembly of functional materials. Here, we systematically study a method to synthesize monodisperse, micron-sized spheres from 3-(trimethoxysilyl)propylmethacrylate (TPM) in a bench-top experiment. Their ease of preparation, smoothness, and physical properties provide distinct advantages over other widely employed materials such as silica, polystyrene, and poly(methyl methacrylate). We describe that the spontaneous emulsification of TPM droplets in water is caused by base-catalyzed hydrolysis, self-condensation, and deprotonation of TPM...
July 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28731353/altering-dna-programmable-colloidal-crystallization-paths-by-modulating-particle-repulsion
#12
Mary X Wang, Jeffrey D Brodin, Jaime A Millan, Soyoung E Seo, Martin Girard, Monica Olvera de la Cruz, Byeongdu Lee, Chad A Mirkin
Colloidal crystal engineering with DNA can be used to realize precise control over nanoparticle (NP) arrangement. Here, we investigate a case of DNA-based assembly where the properties of DNA as a polyelectrolyte brush are employed to alter a hybridization-driven NP crystallization pathway. Using the coassembly of DNA-conjugated proteins and spherical gold nanoparticles (AuNPs) as a model system, we explore how steric repulsion between noncomplementary, neighboring NPs due to overlapping DNA shells can influence their ligand-directed behavior...
July 21, 2017: Nano Letters
https://www.readbyqxmd.com/read/28731339/colloidal-bound-polyphosphate-and-organic-phosphates-are-bioavailable-a-nutrient-solution-study
#13
Jessica Bollyn, Joran Faes, Andreas Fritzsche, Erik Smolders
Colloidal forms of Fe(III) minerals can be stabilized in solution by coatings of organic- or poly-phosphate (P) which reduce the zeta potential. This opens up a route towards the development of nano-forms of P fertilizers. However, it is unclear if such P forms are bioavailable. To address this question, spinach (Spinacia oleracea) was grown in nutrient solutions at equal total P, using three different forms of P (orthophosphate = Pi; hexametaphosphate = HMP; myo-inositolhexaphosphate = IHP), free or bound to goethite/ferrihydrite-colloids...
July 21, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28731116/liquid-exfoliation-of-2d-mos2-nanosheets-and-their-utilization-as-a-label-free-electrochemical-immunoassay-for-subclinical-ketosis
#14
Satish K Tuteja, Todd Duffield, Suresh Neethirajan
We report the step-by-step fabrication of a 2D MoS2 nanostructure-based disposable electrochemical immunosensor to detect β-hydroxybutyrate (βHBA), a novel subclinical ketosis biomarker. The MoS2 nanosheets were exfoliated in the liquid phase by ultrasonication, and then followed by deposition on gold colloid modified screen-printed electrodes (Au-SPE). The MoS2-modified electrodes were thoroughly characterized by physical, electrochemical as well as spectroscopic techniques, and the obtained results indicate the successful and irreversible electrodeposition of MoS2 nanosheets...
July 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28730305/self-assembly-of-the-polymer-brush-grafted-silica-colloidal%C3%A2-array-for-recognition-of-proteins
#15
Wei Chen, Kenneth J Shea, Min Xue, Lili Qiu, Yunhe Lan, Zihui Meng
Three-dimensional photonic crystal sensors are attractive platforms for autonomous chemical sensing and colorimetric bioassays. At present, the photonic crystal sensors with inverse opal structure were extensively studied, which swells or shrinks in response to the analytes. However, the fabrication of inverse opal sensors still remains a major challenge. Herein, we propose a simple and versatile approach to fabricate 3D opal photonic sensors. This photonic crystal is fabricated via assembly of monodispersed silica particles grafted with linear polymeric ligands (SiO2@LPs)...
July 20, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28729523/malignancy-rates-of-thyroid-cytology-cyst-fluid-benign-or-non-diagnostic
#16
Güven Güney, İbrahim Tayfun Şahiner
BACKGROUND We sought to investigate subgroup distribution using Bethesda classification and risks for malignancy. We also compared the malignancy risk of cases that were denoted as non-diagnostic due to cystic contents, with cases that were denoted as non-diagnostic due to presence of other features. MATERIAL AND METHODS The study included pathology test results of 1,440 thyroid nodule samples diagnosed using Bethesda classification. Results of 305 thyroidectomy excision specimens from these patients were also compared with cytology results to determine the frequency of malignancy...
July 21, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28728186/choroidal-neovascularization-and-geographic-atrophy-are-potential-complications-of-early-onset-large-colloid-drusen
#17
Adriano Carnevali, Giuseppe Querques
The authors report a case of large colloid drusen (LCD) complicated by choroidal neovascularization (CNV) and geographic atrophy (GA). A 54-year-old man was referred to the authors' department with diagnosis of early onset retinal drusen. Multimodal imaging led to a diagnosis of LCD complicated by GA in the right eye and CNV in the left eye. The patient received a single injection of intravitreal aflibercept (Eylea; Regeneron, Tarrytown, NY) in the left eye. Six months later, best-corrected visual acuity improved to 20/25, and spectral-domain optical coherence tomography still showed absence of subretinal and intraretinal fluid...
July 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28727434/ellipsometry-of-colloidal-solutions-new-experimental-setup-and-application-to-metallic-colloids
#18
Yann Battie, Michel Stchakovsky, Aotmane En Naciri, Suzanna Akil, Nouari Chaoui, Laurent Broch
An ellipsometric cell is developed to simultaneously determine the shape distribution, the volume fraction, and the complex refractive index of gold and silver colloids. Simulation reveals that this cell drastically improves the detection limit of ellipsometry. Indeed, Ag and Au nanoparticles (NPs) are detected at the ppmv level. We demonstrate that the NPs shape distribution can be estimated from ellipsometric measurements by analyzing them with a shape distributed effective medium theory (SDEMT). The obtained distributions from ellipsometry are in agreement with those deduced from transmission electron microcopy (TEM)...
July 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28726902/limiting-the-valence-advancements-and-new-perspectives-on-patchy-colloids-soft-functionalized-nanoparticles-and-biomolecules
#19
Emanuela Bianchi, Barbara Capone, Ivan Coluzza, Lorenzo Rovigatti, Peter D J van Oostrum
Limited bonding valence, usually accompanied by well-defined directional interactions and selective bonding mechanisms, is nowadays considered among the key ingredients to create complex structures with tailored properties: even though isotropically interacting units already guarantee access to a vast range of functional materials, anisotropic interactions can provide extra instructions to steer the assembly of specific architectures. The anisotropy of effective interactions gives rise to a wealth of self-assembled structures both in the realm of suitably synthesized nano- and micro-sized building blocks and in nature, where the isotropy of interactions is often a zero-th order description of the complicated reality...
July 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28726415/enhanced-diffusion-of-passive-tracers-in-active-enzyme-solutions
#20
Xi Zhao, Krishna Kanti Dey, Selva Jeganathan, Peter J Butler, Ubaldo M Córdova-Figueroa, Ayusman Sen
Colloidal suspensions containing microscopic swimmers have been the focus of recent studies aimed at understanding the principles of energy transfer in fluidic media at low Reynolds number conditions. Going down in scale, active enzymes have been shown to be force-generating, non-equilibrium systems, thus offering opportunity to examine energy transfer at the ultralow Reynolds number regime. By monitoring the change of diffusion of inert tracers dispersed in active enzyme solutions, we demonstrate that the nature of energy transfer in these systems is similar to that reported for larger microscopic active systems, despite the large differences in scale, modes of energy transduction and propulsion...
July 20, 2017: Nano Letters
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