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https://www.readbyqxmd.com/read/28212981/development-of-solid-sedds-vi-effect-of-precoating-of-neusilin%C3%A2-us2-with-pvp-on-drug-release-from-adsorbed-self-emulsifying-lipid-based-formulations
#1
Suhas G Gumaste, Beatryz O S Freire, Abu T M Serajuddin
Adsorption of lipid-based formulations, which are usually liquid, onto silicas has been extensively investigated in the past decade to convert them into solid dosage forms. There are conflicting reports on the ability of commercially available porous silicas, like Neusilin® US2, to release lipid formulations completely, especially after long-term storage. In this study, the release of a model drug, probucol, from different formulations of medium chain lipids and a surfactant, Kolliphor EL (Cremophor EL) or polysorbate 80, were studied after adsorbing them onto Neusilin® US2...
February 14, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28212514/removal-mechanism-of-selenite-by-fe3o4-precipitated-mesoporous-magnetic-carbon-microspheres
#2
Jianwei Lu, Fenglian Fu, Zecong Ding, Na Li, Bing Tang
A mesoporous composite of magnetic carbon microspheres (MCMSs) was synthesized via introducing Fe3O4 nanoscale particles to the surface of carbon microspheres (CMSs) by coprecipitation. Scanning electron microscopy and transmission electron microscopy showed the Fe3O4 nanoscale particles were dispersedly immobilized on the surface of CMSs. The MCMSs demonstrated effective removal of selenite (Se(IV)) from wastewater. MCMSs showed the regular pattern where the lower pH value, the lower residual Se(IV) concentration...
February 14, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28210020/p300-wave-changes-in-patients-with-parkinson-s-disease
#3
Kristina Tokic, Marina Titlic, Amira Beganovic-Petrovic, Enra Suljic, Rinaldo Romac, Slobodan Silic
INTRODUCTION: Parkinson's disease (PD) is chronic progressive neurodegenerative disease. In patients with Parkinson's disease among other symptoms occur cognitive dysfunctions, which can be shown by P300 wave changes. AIM: The aim of this study was to demonstrate that patients with Parkinson's disease have reduced amplitude and prolonged latency, longer than 300 ± 10 ms. MATERIAL AND METHODS: The study included 21 patient suffering from Parkinson's disease...
December 2016: Medical Archives
https://www.readbyqxmd.com/read/28199864/oxidation-of-trichloroethylene-by-the-hydroxyl-radicals-produced-from-oxygenation-of-reduced-nontronite
#4
Xixiang Liu, Songhu Yuan, Man Tong, Deng Liu
Reduction by Fe(II)-bearing silicate minerals has been proposed as an important mechanism for the attenuation of chlorinated hydrocarbons (CHCs) in anoxic subsurfaces. The redox condition of subsurface often changes from anoxic to oxic due to natural processes and human activities, but little is known about the transformation of CHCs induced by Fe(II)-bearing silicate minerals under oxic conditions. This study reveals that trichloroethylene (TCE) can be efficiently oxidized during the oxygenation of reduced nontronite at pH 7...
February 8, 2017: Water Research
https://www.readbyqxmd.com/read/28199855/efficient-as-iii-removal-by-magnetic-cuo-fe3o4-nanoparticles-through-photo-oxidation-and-adsorption-under-light-irradiation
#5
Tianyi Sun, Zhiwei Zhao, Zhijie Liang, Jie Liu, Wenxin Shi, Fuyi Cui
A novel bifunctional CuO-Fe3O4 magnetic material was synthesized and characterized, to remove As(III) through photo-oxidation and adsorption. Photo-oxidation of As(III), adsorption characteristics of CuO-Fe3O4 nanoparticles, the effect of solution pH, ionic strength and coexisting ions on As(III) removal were investigated. Under light irradiation, As(III) could be completely oxidized to less toxic As(V) by CuO-Fe3O4 nanoparticles within 60min in the photo-oxidation reaction. Simultaneously, As(V) could be adsorbed onto the surface of nanoparticles with high efficiency...
January 31, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28198896/size-dependent-stability-of-cobalt-nanoparticles-on-silica-under-high-conversion-fischer-tropsch-environment
#6
Moritz Wolf, Hendrik Kotzé, Nico Fischer, Michael Claeys
Highly monodisperse cobalt crystallites, supported on Stöber silica spheres, as model catalysts for the Fischer-Tropsch synthesis were exposed to simulated high conversion environments in the presence and absence of CO utilising an in house developed in situ magnetometer. The catalyst comprising the smallest crystallites in the metallic state (average diameter of 3.2 nm) experienced pronounced oxidation whilst the ratio of H2O to H2 was increased stepwise to simulate CO conversions from 26% up to complete conversion...
February 15, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28198396/eu-3-doped-bi4si3o12-red-phosphor-for-solid-state-lighting-microwave-synthesis-characterization-photoluminescence-properties-and-thermal-quenching-mechanisms
#7
Yan Zhang, Jiayue Xu, Qingzhi Cui, Bobo Yang
Europium-doped bismuth silicate (Bi4Si3O12) phosphor has been prepared by microwave irradiation method and its crystal structure is determined using Rietveld method. As-prepared phosphor consists of spherical, monodispersed particles with few agglomeration, high crystallinity, and narrow grain size distribution. The phosphor can be efficiently excited in the wavelength range of 260-400 nm, which matched well with the emission wavelengths of NUV LED chips. The photoluminescence spectra exhibit the highest emission peak at 703 nm originating from (5)D0 → (7)F4 transition of Eu(3+) under NUV excitation...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28197839/the-role-of-water-in-the-elastic-properties-of-aluminosilicate-zeolites-dft-investigation
#8
Ilya A Bryukhanov, Andrey A Rybakov, Alexander V Larin, Dmitry N Trubnikov, Daniel P Vercauteren
The bulk and Young moduli and heats of hydration have been calculated at the DFT level for fully optimized models of all-siliceous and cationic zeolites with and without water, and then compared to the corresponding experimental data. Upon the addition of water, the monovalent alkali ion and divalent alkaline earth ion exchanged zeolites presented opposite trends in the elastic modulus. The main contribution to the decrease in the elastic modulus of the alkali ion exchanged zeolites appeared to be a shift of cations from the framework oxygen atoms upon water addition, with the coordination number often remaining the same...
March 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28195455/hydrolytic-stability-of-3-aminopropylsilane-coupling-agent-on-silica-and-silicate-surfaces-at-elevated-temperatures
#9
Denis V Okhrimenko, Akin Budi, Marcel Ceccato, Marite Cardenas, Dorte B Johansson, Dorthe Lybye, Klaus Bechgaard, Martin Peter Andersson, Susan L S Stipp
3-Aminopropylsilane (APS) coupling agent is widely used in industrial, biomaterial and medical applications to improve adhesion of polymers to inorganic materials. However, during exposure to elevated humidity and temperature, the deposited APS layers can decompose, leading to reduction in coupling efficiency and thus decreasing the product quality and the mechanical strength of the polymer-inorganic material interface. Therefore, a better understanding of the chemical state and stability of APS on inorganic surfaces is needed...
February 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28190991/quantitative-x-ray-pair-distribution-function-analysis-of-nanocrystalline-calcium-silicate-hydrates-a-contribution-to-the-understanding-of-cement-chemistry
#10
Sylvain Grangeon, Alejandro Fernandez-Martinez, Alain Baronnet, Nicolas Marty, Agnieszka Poulain, Erik Elkaïm, Cédric Roosz, Stéphane Gaboreau, Pierre Henocq, Francis Claret
The structural evolution of nanocrystalline calcium silicate hydrate (C-S-H) as a function of its calcium to silicon (Ca/Si) ratio has been probed using qualitative and quantitative X-ray atomic pair distribution function analysis of synchrotron X-ray scattering data. Whatever the Ca/Si ratio, the C-S-H structure is similar to that of tobermorite. When the Ca/Si ratio increases from ∼0.6 to ∼1.2, Si wollastonite-like chains progressively depolymerize through preferential omission of Si bridging tetrahedra...
February 1, 2017: Journal of Applied Crystallography
https://www.readbyqxmd.com/read/28190575/water-quality-variables-and-pollution-sources-shaping-stream-macroinvertebrate-communities
#11
Elisabeth Berger, Peter Haase, Mathias Kuemmerlen, Moritz Leps, Ralf Bernhard Schäfer, Andrea Sundermann
In 2015, over 90 percent of German rivers failed to reach a good ecological status as demanded by the EU Water Framework Directive (WFD). Deficits in water quality, mainly from diffuse pollution such as agricultural run-off, but also from wastewater treatment plants (WWTPs), have been suggested as important drivers of this decline in ecological quality. We modelled six macroinvertebrate based metrics indicating ecological quality for 184 streams in response to a) PCA-derived water quality gradients, b) individual water quality variables and c) catchment land use and wastewater exposure indices as pollution drivers...
February 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28189114/nano-scale-synthesis-of-the-complex-silicate-minerals-forsterite-and-enstatite
#12
Lawrence M Anovitz, Adam J Rondinone, Lindsay Sochalski-Kolbus, Jörgen Rosenqvist, Michael C Cheshire
Olivine is a relatively common family of silicate minerals in many terrestrial and extraterrestrial environments, and is also useful as a refractory ceramic. A capability to synthesize fine particles of olivine will enable additional studies on surface reactivity under geologically relevant conditions. This paper presents a method for the synthesis of nanocrystalline samples of the magnesium end-member, forsterite (Mg2SiO4) in relatively large batches (15-20g) using a sol-gel/surfactant approach. Magnesium methoxide and tetraethylorthosilicate (TEOS) are refluxed in a toluene/methanol mixture using dodecylamine as a surfactant and tert-butyl amine and water as hydrolysis agents...
January 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28189113/monodisperse-mesoporous-silica-nanoparticles-of-distinct-topology
#13
Leilei Luo, Yucang Liang, Egil Sev Erichsen, Reiner Anwander
Monodisperse and uniform high-quality MCM(Mobil Composition of Matter)-48-type CMSNs (Cubic Mesoporous Silica Nanoparticles) are readily prepared by simply optimizing the molar ratio of ethanol and surfactant in the system TEOS-CTAB-NaOH-H2O-EtOH (TEOS=tetraethyl orthosilicate, CTAB=cetyltrimethylammonium bromide, EtOH=ethanol). In the absence of ethanol only hexagonal mesoporous silica with ellipsoidal and spherical morphology are obtained. The presence of ethanol drives a mesophase transformation from hexagonal to mixed hexagonal/cubic, further to purely cubic, and finally to a mixed cubic/lamellar...
January 31, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28189097/thermo-responsive-nanoarrays-of-silver-nanoparticle-silicate-nanoplatelet-and-pnipaam-for-the-antimicrobial-applications
#14
Hsiao-Chu Lin, Yu-An Su, Ting-Yu Liu, Yu-Jane Sheng, Jiang-Jen Lin
The ternary nanohybrids of silver nanoparticles (AgNPs) in combination with silicate nanoplatelets (NSP) and thermally sensitive poly(N-isopropylacrylamide) (PNiPAAm) were fabricated for antibacterial applications. PNiPAAm were chemically grafted on the NSP by atom-transfer radical polymerization (ATRP) via polymerizing N-isopropylacrylamide monomers with sol-gel linkers (BBTES). The nanoparticles of AgNPs then were adsorbed on NSP-PNiPAAm nanosheets through in situ reduction reaction of AgNO3 in aqueous dispersion...
January 27, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28188891/3-2-deoxy-%C3%AE-d-erythro-pentafuranosyl-pyrimido-1-2-%C3%AE-purin-10-3h-one-deoxyguanosine-adducts-of-workers-exposed-to-asbestos-fibers
#15
Stefano Bonassi, Filippo Cellai, Armelle Munnia, Donatella Ugolini, Alfonso Cristaudo, Monica Neri, Mirta Milić, Alessandra Bonotti, Roger W Giese, Marco E M Peluso
Asbestos is the commercial name for a group of silicate minerals naturally occurring in the environment and widely used in the industry. Asbestos exposure has been associated with pulmonary fibrosis, mesothelioma, and malignancies, which may appear after a period of latency of 20-40 years. Mechanisms involved in the carcinogenic effects of asbestos are still not fully elucidated, although the oxidative stress theory suggests that phagocytic cells produce large amounts of reactive oxygen species, due to their inability to digest asbestos fiber...
February 7, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28185678/in-vitro-fatigue-and-fracture-testing-of-cad-cam-materials-in-implant-supported-molar-crowns
#16
Verena Preis, Sebastian Hahnel, Michael Behr, Laila Bein, Martin Rosentritt
OBJECTIVE: To investigate the fatigue and fracture resistance of different CAD/CAM-materials as implant- or tooth-supported molar crowns with respect to the clinical procedure (screwed/bonded restoration). METHODS: 168 crowns were fabricated from different CAD/CAM-materials (n=8/material): ZLS (zirconia-reinforced lithium silicate ceramic; Suprinity, Vita-Zahnfabrik), COB (composite; Brilliant Crios, Coltene), COL (composite; Lava Ultimate, 3M Espe), PMV/PPV (polyether ether ketone (PEEK)+milled composite veneer/composite paste veneer; BioHPP+HIPC veneer/Crealign veneer, Bredent), COH (composite; Block HC, Shofu), and ZIR (zirconia; IPS e...
February 6, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28184036/redox-preconditioning-deep-cratonic-lithosphere-for-kimberlite-genesis-evidence-from-the-central-slave-craton
#17
G M Yaxley, A J Berry, A Rosenthal, A B Woodland, D Paterson
We present the first oxygen fugacity (fO2) profile through the cratonic lithospheric mantle under the Panda kimberlite (Ekati Diamond Mine) in the Lac de Gras kimberlite field, central Slave Craton, northern Canada. Combining this data with new and existing data from garnet peridotite xenoliths from an almost coeval kimberlite (A154-N) at the nearby Diavik Diamond Mine demonstrates that the oxygen fugacity of the Slave cratonic mantle varies by several orders of magnitude as a function of depth and over short lateral distances...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28183671/effect-of-phosphorus-precursors-on-the-structure-of-bioactive-calcium-phosphate-silicate-systems
#18
Katalin Sinkó, Anikó Meiszterics, János Rohonczy, Balázs Kobzi, Shiro Kubuki
The main aim of this work was to synthesize calcium phosphate silicate bioceramics by a low energy-consuming sol-gel method applying various phosphorous precursors (triethyl phosphate, phosphoric acid, and ammonium hydrogen phosphate). The investigations concentrated on the influence of phosphorous initial compounds on the bond and crystalline structures and the material quality. The application of the alkoxide and inorganic P-precursors results in considerably different textures. The inorganic PO4-containing precursors lead to sol formations...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183667/synergistic-acceleration-in-the-osteogenic-and-angiogenic-differentiation-of-human-mesenchymal-stem-cells-by-calcium-silicate-graphene-composites
#19
Ming-You Shie, Wei-Hung Chiang, I-Wen Peter Chen, Wen-Yi Liu, Yi-Wen Chen
Recent exciting findings of the biological interactions of graphene materials have shed light on potential biomedical applications of graphene-containing composites. Owing to the superior mechanical properties and low coefficient of thermal expansion, graphene has been widely used in the reinforcement of biocomposites. In the present study, various ratios of graphene (0.25wt%, 0.5wt% and 1.0wt%) were reinforced into calcium silicate (CS) for bone graft application. Results show that the graphene was embedded in the composites homogeneously...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183631/in-vitro-stimulation-of-vascular-endothelial-growth-factor-by-borate-based-glass-fibers-under-dynamic-flow-conditions
#20
Sisi Chen, Qingbo Yang, Richard K Brow, Kun Liu, Katherine A Brow, Yinfa Ma, Honglan Shi
Bioactive borate glass has been recognized to have both hard and soft tissue repair and regeneration capabilities through stimulating both osteogenesis and angiogenesis. However, the underlying biochemical and cellular mechanisms remain unclear. In this study, dynamic flow culturing modules were designed to simulate the micro-environment near the vascular depletion and hyperplasia area in wound-healing regions, thus to better investigate the mechanisms underlying the biocompatibility and functionality of borate-based glass materials...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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