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https://www.readbyqxmd.com/read/29165394/wxc-%C3%AE-sic-nanocomposite-catalysts-used-in-aqueous-phase-hydrogenation-of-furfural
#1
Jacek Rogowski, Mariusz Andrzejczuk, Joanna Berlowska, Michal Binczarski, Dorota Kregiel, Andrzej Kubiak, Magdalena Modelska, Elzbieta Szubiakiewicz, Andrei Stanishevsky, Jolanta Tomaszewska, Izabela Alina Witonska
This study investigates the effects of the addition of tungsten on the structure, phase composition, textural properties and activities of β-SiC-based catalysts in the aqueous phase hydrogenation of furfural. Carbothermal reduction of SiO₂ in the presence of WO₃ at 1550 °C in argon resulted in the formation of WxC-β-SiC nanocomposite powders with significant variations in particle morphology and content of WxC-tipped β-SiC nano-whiskers, as revealed by TEM and SEM-EDS. The specific surface area (SSA) of the nanocomposite strongly depended on the amount of tungsten and had a notable impact on its catalytic properties for the production of furfuryl alcohol (FA) and tetrahydrofurfuryl alcohol (THFA)...
November 22, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29165390/comparison-of-anionic-cationic-and-nonionic-surfactants-as-dispersing-agents-for-graphene-based-on-the-fluorescence-of-riboflavin
#2
Rocío Mateos, Soledad Vera, Mercedes Valiente, Ana María Díez-Pascual, María Paz San Andrés
Fluorescence quenching is a valuable tool to gain insight about dynamic changes of fluorophores in complex systems. Graphene (G), a single-layered 2D nanomaterial with unique properties, was dispersed in surfactant aqueous solutions of different nature: non-ionic polyoxyethylene-23-lauryl ether (Brij L23), anionic sodium dodecylsulphate (SDS), and cationic hexadecyltrimethylammonium bromide (CTAB) and dodecyltrimethylammonium bromide (DTAB). The influence of the surfactant type, chain length and concentration, G total concentration and G/surfactant weight ratio on the fluorescence intensity of vitamin B₂ (riboflavin) was investigated...
November 22, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29164869/role-of-secondary-particle-formation-in-the-persistence-of-silver-nanoparticles-in-humic-acid-containing-water-under-light-irradiation
#3
Tuoya Zhang, Dawei Lu, Lixi Zeng, Yongguang Yin, Yujian He, Qian Liu, Guibin Jiang
The wide use of silver nanoparticles (AgNPs) leads to the increasing release of AgNPs into the environment. Dissolved organic matter (DOM) is a key factor affecting the behaviors and fate of AgNPs in the aquatic environment. However, the mechanisms for the DOM-mediated transformations of AgNPs are still not fully understood. In this study, we investigated the persistence of AgNPs in aquatic environment in the presence of different concentrations of humic acid (HA) over periods of time up to 14 days. The Ag species were monitored and characterized by absorption spectrometry, transmission electron microscopy (TEM), inductively coupled plasma mass spectrometry (ICP-MS), and multicollector ICP-MS (MC-ICP-MS)...
November 22, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29164714/very-green-photosynthesis-of-gold-nanoparticles-by-a-living-aquatic-plant-photoreduction-of-au-iii-by-the-seaweed-ulva-armoricana
#4
Ofhani Christopher Mukhoro, Wiets D Roos, Mohammed Jaffer, John J Bolton, Martin J Stillman, Denzil R Beukes, Edith Antunes
Light-assisted in vivo synthesis of gold nanoparticles (NPs) from aqueous solutions of dilute Au(III) salts by a living green marine seaweed (Ulva armoricana) is reported for the first time. NPs synthesis using typical procedures have many associated environmental hazards. The reported methods involve green, nontoxic, eco-friendly synthetic procedures. The formation of AuNPs was extremely rapid (~15 minutes) following illumination of the living U. armoricana, while the rate of NP formation in the dark was very slow (over 2 weeks)...
November 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29163899/design-crystal-structure-and-atomic-force-microscopy-study-of-thioether-ligated-d-l-cyclic-antimicrobial-peptides-against-multidrug-resistant-pseudomonas-aeruginosa
#5
Runze He, Ivan Di Bonaventura, Ricardo Visini, Bee-Ha Gan, Yongchun Fu, Daniel Probst, Alexandre Lüscher, Thilo Köhler, Christian van Delden, Achim Stocker, Wenjing Hong, Tamis Darbre, Jean-Louis Reymond
Here we report a new family of cyclic antimicrobial peptides (CAMPs) targeting MDR strains of Pseudomonas aeruginosa. These CAMPs are cyclized via a xylene double thioether bridge connecting two cysteines placed at the ends of a linear amphiphilic alternating d,l-sequence composed of lysines and tryptophans. Investigations by transmission electron microscopy (TEM), dynamic light scattering and atomic force microscopy (AFM) suggest that these peptide macrocycles interact with the membrane to form lipid-peptide aggregates...
November 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29163817/characteristics-and-genetic-diversity-of-multi-drug-resistant-extended-spectrum-beta-lactamase-esbl-producing-escherichia-coli-isolated-from-bovine-mastitis
#6
Tariq Ali, Sadeeq Ur Rahman, Limei Zhang, Muhammad Shahid, Dandan Han, Jian Gao, Shiyao Zhang, Pamela L Ruegg, Umer Saddique, Bo Han
A characterization of the drug resistance profiles, identification of PCR-based replicon typing, and multilocus sequence typing (MLST) and analysis of 46 ESBL-producing Escherichia coli from cows with mastitis are described. All multidrug-resistant isolates of various phylogenetic groups (A = 31, B1= 3, B2 = 2, D = 10) were ESBL-producers of genotypes CTX-M-15 (29), CTX-M-55 (4), CTX-M-14 (4), CTX-M-3 (1), CTX-M-1 (1), TEM (22) and SHV (8) that were found on conjugative plasmids of diverse incompatibility groups (primarily IncF)...
October 27, 2017: Oncotarget
https://www.readbyqxmd.com/read/29163650/cumulus-cell-expansion-and-ultrastructural-changes-in-in-vitro-matured-bovine-oocytes-under-heat-stress
#7
J A Ahmed, N Nashiruddullah, D Dutta, R K Biswas, P Borah
Cumulus-oocyte complexes (COCs) from cows were matured under normal (38.5°C) and elevated temperatures (41°C) simulating heat stress and their maturation was assessed based on measurement of cumulus expansion in both groups. There was a significant reduction (P<0.01) in maturation rate in the heat stressed oocytes. The ultrastructural events associated with in vitro oocyte maturation and changes associated with elevated temperature were also studied by transmission electron microscopy (TEM). Normal maturation cellular events were marked by migration of Golgi and mitochondria from the cortical regions, and conversely by a migration of cortical granules from the inner regions to a sub-perivitelline zone...
2017: Iranian journal of veterinary research
https://www.readbyqxmd.com/read/29162927/dislocation-multiplications-in-extremely-small-hexagonal-structured-titanium-nanopillars-without-dislocation-starvation
#8
Peng Huang, Qian Yu
"Smaller is stronger" has been commonly observed in cubic structured and hexagonal close-packed (HCP) structured materials. Dislocation starvation phenomenon is highly responsible for the increase of strength at smaller scale in cubic materials. However, by using quantitative in situ transmission electron microscope (TEM) nano-mechanical testing on cylindrical titanium nano-pillars with diameters of ~150 nm but varied orientations and three dimensional dislocation tomography, we found that dislocation nucleation and multiplication dominate the plastic deformation of the nano-pillars with no sign of dislocation starvation, resulting in much better ability of dislocation storage and plastic stability of HCP structured materials at extremely small scale...
November 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29162478/liposomes-assembled-from-dimeric-retinoic-acid-phospholipid-with-improved-pharmacokinetic-properties
#9
Lu Lu, Yawei Du, Muhammad Ismail, Longbing Ling, Chen Yao, Zhenglin Fu, Xinsong Li
All-trans-retinoic acid (ATRA) exhibits potent cytotoxicities against different cancer cells by binding to retinoic acid receptors (RARs), which is regarded as the first example of targeted therapy in acute promyelocytic leukemia (APL). However, its extensive clinical applications have been limited because of poor aqueous solubility, short half-life time and side effects. In this report, dimeric ATRA phosphorylcholine prodrug (Di-ATRA-PC) was designed and assembled into nanoliposomes to improve its pharmacokinetic properties...
November 18, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29162461/compressed-collagen-constructs-with-optimized-mechanical-properties-and-cell-interactions-for-tissue-engineering-applications
#10
Fatemeh Ajalloueian, Nikolaos Nikogeorgos, Ali Ajalloueian, Magdalena Fossum, Seunghwan Lee, Ioannis S Chronakis
In this study, we are introducing a simple, fast and reliable add-in to the technique of plastic compression (PC) to obtain collagen sheets with decreased fibrillar densities, representing improved cell-interactions and mechanical properties. Collagen hydrogels with different initial concentrations (1.64mg/mL-0.41mg/mL) were compressed around an electrospun sheet of PLGA. The scaffolds were then studied as non-seeded, or seeded with 3T3 fibroblast cells and cultured for 7 days. Confocal microscopy and TEM imaging of non-seeded scaffolds showed that by decreasing the share of collagen in the hydrogel formula, collagen sheets with similar thickness but lower fibrous densities were achieved...
November 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29161920/development-optimization-and-in-vitro-characterization-of-dasatinib-loaded-peg-functionalized-chitosan-capped-gold-nanoparticles-using-box-behnken-experimental-design
#11
Sandeep Kumar Reddy Adena, Mansi Upadhyay, Harsh Vardhan, Brahmeshwar Mishra
OBJECTIVE: The purpose of this research study was to develop, optimize, and characterize dasatinib loaded polyethylene glycol (PEG) stabilized chitosan capped gold nanoparticles (DSB-PEG-Ch-GNPs). METHODS: Gold (III) chloride hydrate was reduced with chitosan and the resulting nanoparticles were coated with thiol-terminated PEG and loaded with dasatinib (DSB). Plackett-Burman design (PBD) followed by Box-Behnken experimental design (BBD) were employed to optimize the process parameters...
November 21, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/29161651/enhanced-anticancer-effect-of-fabricated-gallic-acid-cds-on-the-rgo-nanosheets-on-human-glomerular-mesangial-ip15-and-epithelial-proximal-hk2-kidney-cell-lines-cytotoxicity-investigations
#12
Wei Peng, Pengcheng Luo, Dingwen Gui, Weidong Jiang, Haixia Wu, Jie Zhang
In spite of the technological innovation in the biomedical science, cancer remains a critical disease. In this study, we designed a gallic acid/cadmium sulfide (GA/CdS) nanocomposite fabricated on the reduced graphene oxide (GA/CdS-rGO) nanosheets for the treatment system of human kidney cancer cells. The GA/CdS-rGO nanosheets have been prepared using gallic acid as a reducing agent. The characterization of nanocomposites was studied using UV-Vis spectroscope, FT-IR, XRD, SEM and TEM. The microscopic images showed the spherical shape and nano-scaled CdS nanoparticles on the sheet like rGO nanomaterials...
November 8, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29161647/simple-synthesis-of-self-supported-hierarchical-aupd-alloyed-nanowire-networks-for-boosting-electrocatalytic-activity-toward-formic-acid-oxidation
#13
Tao Yuan, Hong-Yan Chen, Xiaohong Ma, Jiu-Ju Feng, Pei-Xin Yuan, Ai-Jun Wang
Herein, self-supported hierarchical AuPd alloyed interconnected nanowire networks (AuPd NCNs) were fabricated by a one-pot co-reduction method. Theophylline was acted as the capping and structure-directing agents. The product was mainly characterized by a series of techniques such as transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The hierarchical nanostructures had the enlarged electrochemically active surface area (EASA), and the enhanced catalytic activity toward formic acid oxidation reaction (FAOR) and strengthened poisoning tolerance for poisoning CO-like intermediates by cyclic voltammetry and chronoamperometry, which outperformed commercial Pd black catalyst...
November 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29161503/hierarchical-mesoporous-nio-mno2-pani-core-shell-microspheres-highly-efficient-and-stable-bifunctional-electrocatalysts-for-oxygen-evolution-and-reduction-reactions
#14
Junkai He, Mingchao Wang, Wenbo Wang, Ran Miao, Wei Zhong, Sheng-Yu Chen, Shannon Poges, Tahereh Jafari, Wenqiao Song, Jiachen Liu, Steven L Suib
We report on the new facile synthesis of mesoporous NiO/MnO2 in one-step by modifying inverse micelle templated UCT (University of Connecticut) methods. The catalyst shows excellent electrocatalytic activity and stability for both the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) in alkaline media after further coating with polyaniline. For electrochemical performance, the optimized catalyst exhibits a potential gap, ΔE, of 0.75 V to achieve a current of 10 mA cm-2 for the OER and -3 mA cm-2 for the ORR in 0...
November 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29160836/an-in-vitro-study-of-the-photodynamic-effectiveness-of-go-ag-nanocomposites-against-human-breast-cancer-cells
#15
Fozia Shaheen, Muhammad Hammad Aziz, Muhammad Fakhar-E-Alam, Muhammad Atif, Mahvish Fatima, Riaz Ahmad, Atif Hanif, Saqib Anwar, Fatima Zafar, Ghazanfar Abbas, Syed Mansoor Ali, Mukhtar Ahmed
Graphene-based materials have garnered significant attention because of their versatile bioapplications and extraordinary properties. Graphene oxide (GO) is an extremely oxidized form of graphene accompanied by the functional groups of oxygen on its surface. GO is an outstanding platform on which to pacify silver nanoparticles (Ag NPs), which gives rise to the graphene oxide-silver nanoparticle (GO-Ag) nanocomposite. In this experimental study, the toxicity of graphene oxide-silver (GO-Ag) nanocomposites was assessed in an in vitro human breast cancer model to optimize the parameters of photodynamic therapy...
November 21, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29160732/optimization-and-characterization-of-sertaconazole-nitrate-flexisomes-embedded-in-hydrogel-for-improved-antifungal-activity
#16
Satish K Mandlik, Shridhar S Siras, Kiran R Birajdar
The aim of the present research work was to develop, characterize and optimize sertaconazole nitrate (STZN) embedded flexisomes (STZN-FS) to improve the cutaneous anti-fungal activity of STZN. Flexisomes are self-aggregating, flexible, deformable lipidic vesicles possessing an aqueous core. A 3(2) factorial design was implemented to optimize the effects of the critical material attributes of concentration of phospholipid (X1) and edge activator (X2) on the critical quality attributes of particle size (Y1), entrapment efficiency (Y2) and deformability index (Y3)...
November 21, 2017: Journal of Liposome Research
https://www.readbyqxmd.com/read/29159850/from-two-to-three-dimensions-the-importance-of-the-third-dimension-for-evaluating-the-limits-to-neuronal-miniaturization-in-insects
#17
Stefan Fischer, Zhiyuan Lu, Ian A Meinertzhagen
Most studies dealing with the limits to miniaturization in insect brains have until now relied on information based on data collected in two dimensions: either histological sections imaged by light microscopy, or electron micrographs of single ultrathin sections imaged by transmission electron microscopy (TEM). To test the validity of transferring information gained from two-dimensional images to the third dimension, we examined a 3D image stack from serial-section TEM (ssTEM) of the optic neuropiles of the miniature parasitic wasp Trichogramma brassicae (Bezdenko, 1968)...
November 21, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/29159345/multiplexed-electrochemical-immunoassay-for-two-immunoglobulin-proteins-based-on-cd-and-cu-nanocrystals
#18
Dianping Tang, Jingjing Ren, Minghua Lu
Herein, a simple and feasible electrochemical immunosensing method for simultaneous voltammetric detection of two immunoglobulin proteins, human IgG (HIgG) and rabbit IgG (RIgG), was developed using two distinguishable signal-generation tags on the same electrode. The immunosensor was prepared by immobilizing two Fab antibody fragments on a gold electrode. After this, Cu and Cd nanocrystals, as nanotags, were synthesized and functionalized with identical detection antibodies. Transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR) were employed to characterize the Cu and Cd nanocrystals...
November 21, 2017: Analyst
https://www.readbyqxmd.com/read/29159224/data-on-iron-oxide-core-oil-in-water-nanoemulsions-for-atherosclerosis-imaging
#19
Geoffrey Prévot, Stéphane Mornet, Cyril Lorenzato, Tina Kauss, Laurent Adumeau, Alexandra Gaubert, Julie Baillet, Philippe Barthélémy, Gisèle Clofent-Sanchez, Sylvie Crauste-Manciet
The data presented in this article are related to the publication entitled "Iron oxide core oil-in-water nanoemulsion as tracer for atherosclerosis MPI and MRI imaging" (Prévot et al., 2017) [1]. Herein we describe the synthesis and the characteristics of the Superparamagnetic Iron Oxide Nanoparticles (SPION) loaded inside nanoemulsions (NEs). Focus was set on obtaining SPION with narrow size distribution and close to superparamagnetic limit (20 nm) in order to reach a reasonable magnetic signal. Nanoparticles (NPs) of three different sizes were obtained (7, 11 and 18 nm) and characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), diffuse reflectance infrared Fourier transform (DRIFT) and thermogravimetric analysis (TGA)...
December 2017: Data in Brief
https://www.readbyqxmd.com/read/29158841/autophagy-maintains-the-function-of-bone-marrow-mesenchymal-stem-cells-to-prevent-estrogen-deficiency-induced-osteoporosis
#20
Meng Qi, Liqiang Zhang, Yang Ma, Yi Shuai, Liya Li, Kefu Luo, Wenjia Liu, Yan Jin
Rationale: The impaired function of endogenous bone marrow mesenchymal stem cells (BMMSCs) is a determinant in the development of osteoporosis (OP). Recent researches have proved that autophagy plays an important role in maintenance of skeletal phenotype. However, whether autophagy affects the development of OP through regulating the function of BMMSCs remains elusive. Methods: Ovariectomy (OVX)-induced OP model and sham model were established in 8-week-old C57 mice. The differentiation and immunoregulation properties of BMMSCs from two models were examined by osteogenic/adipogenic induction in vitro and treatment of a dextran sulfate sodium (DSS)-induced mice colitis model in vivo...
2017: Theranostics
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