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Rajan Narayan, Tarun Agarwal, Debasish Mishra, Somnath Maji, Sujata Mohanty, Asok Mukhopadhyay, Tapas Kumar Maiti
Three-dimensional multicellular human bone marrow mesenchymal stem cells (hBM-MSCs) are showing a great promise in the repair of bone tissue due to its osteogenic differentiation potential, mimicking in vivo microenvironment and immunomodulatory property. In the present study, the potential of hBM-MSC microtissues (MTs) in combination with a biocomposite material to form vascularized bone-like tissue at an ectopic site in an immunocompromised mouse was evaluated. The scaffold was fabricated using gelatin, carboxymethyl cellulose, polyvinyl alcohol and nano-hydroxyapatite (GCnHP) by the freeze-drying method...
October 5, 2017: Colloids and Surfaces. B, Biointerfaces
Pin Huang, Kena Ma, Xinjie Cai, Dan Huang, Xu Yang, Jiabing Ran, Fushi Wang, Tao Jiang
Increased use of reconstruction procedures in orthopedics has improved the life of patients undergoing surgery. However, surgical site infection remains a major challenge. Efforts were made to fabricate antibacterial surfaces with good biocompatibility. This present study aimed to fabricate zinc-incorporated chitosan/gelatin (CS/G) nanocomposite coatings on the titanium substrates via electrophoretic deposition (EPD). Physicochemical characterization confirmed that zinc was successfully deposited in a metallic oxide/salt complex status...
October 6, 2017: Colloids and Surfaces. B, Biointerfaces
Yongxin Zhang, Yaocun Yue, Meng Chang
Combination therapy is frequently applied to anesthesia and analgesia for its benefits, which includes prolonged analgesia following peripheral nerve blockade, and reduced side effects. The aim of this study was to develop chitosan (CH) coated poly(ε-caprolactone) (PCL) nanoparticles to co-deliver ropivacaine (RPV) and dexamethasone (DEM) (RPV/DEM CH-PCL NPs) for the prolongation of anesthesia and pain relief. In the present study, RPV/DEM CH-PCL NPs were fabricated. The properties of CH-PCL NPs were evaluated for their particle sizes, zeta potential, drug loading capacity and in vitro drug release profile...
October 11, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
Trevor D Rapson, Jian-Wei Liu, Alagacone Sriskantha, Mustafa Musameh, Christopher J Dunn, Jeffrey S Church, Andrea Woodhead, Andrew C Warden, Mark J Riley, Jeffrey R Harmer, Christopher J Noble, Tara D Sutherland
In our previous studies, heme was bound into honeybee silk to generate materials that could function as nitric oxide sensors or as recoverable heterogeneous biocatalysts. In this study, we sought to increase the heme-binding capacity of the silk protein by firstly redesigning the heme binding site to contain histidine as the coordinating residue and secondly, by adding multiple histidine residues within the core of the coiled coil core region of the modified silk protein. We used detergent and a protein denaturant to confirm the importance of the helical structure of the silk for heme coordination...
September 4, 2017: Journal of Inorganic Biochemistry
Golnoush Zamiri, Samira Bagheri
Zero-dimensional graphene quantum dots (GQDs) consist of single- or few-layer graphene with a size less than 20 nm and stand for a new type of QDs with unique properties combining the graphene nature and size-resulted quantum effects. GQDs possess unique optical and electronic properties, and in particular possess a band-gap less than 2.0 eV because of quantum confinement and edge effects. In this study, we investigated the performance of DSSCs using different thicknesses of ZnO nanoparticles as a photo-anode and GQDs as a green photosensitizer...
October 7, 2017: Journal of Colloid and Interface Science
Qiang Li, Chunyan Yong, Weiwei Cao, Xi Wang, Lina Wang, Jie Zhou, Xiaodong Xing
In this work, N-alkylated poly (4-vinylpyridine) (NPVP), a cationic polymer, was firstly applied for the surface modification of Fe3O4 nanoparticles. Then the modified Fe3O4 nanoparticles (Fe3O4@NPVP NPs) combined with graphene oxide (GO) through simple electrostatic binding. Subsequently, deposited Ag nanoparticles (Ag NPs) procedure was carried out to form the multiple antibacterial nanocomposites (GO-Fe3O4@NPVP-Ag). The synthesized nanostructures were well characterized by Transmission Electron Microscope (TEM), X-ray powder diffraction (XRD), Fourier-transform infrared (FT-IR) and Raman spectroscopy...
October 3, 2017: Journal of Colloid and Interface Science
Zhiming Sun, Chunquan Li, Xin Du, Shuilin Zheng, Guifang Wang
To overcome rapid electron-hole recombination and low adsorption capacity of single g-C3N4 photocatalyst, the present work reports on the fabrication of two kinds of visible-light-driven composite photocatalysts (g-C3N4/kaolinite and g-C3N4/illite composites). 2D/2D assembly was successfully achieved in this work. Furthermore, the as-synthesized composites exhibited significantly enhanced photocatalytic activity under visible-light irradiation, whose reaction rate constants were almost 4.13 times (g-C3N4/kaolinite) and 3...
October 4, 2017: Journal of Colloid and Interface Science
Yan Li, Junlin He, Jun Chen, Yazhen Niu, Yilin Zhao, Yuchan Zhang, Chao Yu
In this study, a dual-type responsive electrochemical immunosensor was developed for the quantitative detection of proprotein convertase subtilisin/kexin type 9 (PCSK9), a potential biomarker of cardiovascular disease in serum. N-doped graphene nanoribbons (N-GNRs) with good conductivity were used as the sensing matrix modifying the glassy carbon electrode. Palladium platinum alloy (PdPt) nanoparticles with high catalytic performance toward the reduction of hydrogen peroxide (H2O2) were reduced onto amino-functionalized fullerene (n-C60-PdPt) and significantly amplified the electrochemical signal recorded by the amperometric i-t curve...
September 28, 2017: Biosensors & Bioelectronics
Jingling Yang, Wenjun Xu, Chun He, Yajing Huang, Zaili Zhang, Yunchen Wang, Lingling Hu, Dehua Xia, Dong Shu
Hierarchical porous sludge-derived activated carbon coated on macroporous silicon carbide (SiC) foams substrate has been facilely fabricated via a simple one-step strategy by utilizing sludge as carbon source, and jointly using zinc chloride and hexadecanol as pore forming agents. The sludge-derived carbon has been confirmed to be hierarchical macro-meso-microporous structure based on detailed characterization by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectra and nitrogen adsorption-desorption measurement...
October 2, 2017: Journal of Hazardous Materials
He Zhang, Gang Xue, Hong Chen, Xiang Li
To solve sludge disposal and management problems during dyeing wastewater treatment, the produced excess biological sludge and ferric sludge were fabricated into a magnetic biochar composite (MBC) under the optimal hydrothermal carbonization (HTC) conditions. With ferric sludge mixing, the generated MBC contained paramagnetic Fe3O4, showed a smaller diameter of approximately 200 nm, a smaller pore size, a larger specific surface area and a higher carbonization degree than BC prepared using a single biological sludge process under the same HTC conditions...
October 4, 2017: Chemosphere
Antonio D'Amore, Samuel K Luketich, Giuseppe M Raffa, Salim Olia, Giorgio Menallo, Antonino Mazzola, Flavio D'Accardi, Tamir Grunberg, Xinzhu Gu, Michele Pilato, Marina V Kameneva, Vinay Badhwar, William R Wagner
Valvular heart disease is currently treated with mechanical valves, which benefit from longevity, but are burdened by chronic anticoagulation therapy, or with bioprosthetic valves, which have reduced thromboembolic risk, but limited durability. Tissue engineered heart valves have been proposed to resolve these issues by implanting a scaffold that is replaced by endogenous growth, leaving autologous, functional leaflets that would putatively eliminate the need for anticoagulation and avoid calcification. Despite the diversity in fabrication strategies and encouraging results in large animal models, control over engineered valve structure-function remains at best partial...
October 6, 2017: Biomaterials
Caroline A Sabin, Lene Ryom, Antonella d'Arminio Monforte, Camilla I Hatleberg, Christian Pradier, Wafaa El-Sadr, Ole Kirk, Rainer Weber, Andrew N Phillips, Amanda Mocroft, Fabrice Bonnet, Matthew Law, Stephane de Wit, Peter Reiss, Jens D Lundgren
OBJECTIVE: To investigate the association between abacavir (ABC) use and recurrent myocardial infarction (MI) among HIV-positive people with a prior MI. DESIGN: International multi-cohort collaboration with follow-up from 1999-2016. METHODS: The rate of recurrent MI was described among D:A:D participants who experienced an index MI whilst in the study, and who remained under follow-up beyond 28 days after this MI. Follow-up was considered to the date of next MI, death, 01/Feb/2016 or 6 months after last clinic visit...
October 12, 2017: AIDS
Jian Li, Changcheng Xu, Yan Zhang, Xiaohua Tang, Wei Qi, Qiong Wang
Pressure-driven and lower flux of superwetting ultrafiltration membranes in various emulsions separation are long-standing issues and major barriers for their large-scale utilization. Even though currently reported membranes have achieved great success in emulsions separeation, they still suffer from low flux and complex fabrication process resulting from their smaller nanoscale pore size. Herein, utilizition of coconut shell as a novel biomaterial for developing into a layer through the simple smashing, cleaning and stacking procedures, which not only could avoid the complexity of film making process, but also could realize efficient gravity-directed separation of both immiscible oil/water mixtures and water-in-oil emulsions with high flux...
September 30, 2017: Journal of Colloid and Interface Science
Niloufar Eskandarpour, Hassan Sereshti
The nanofibrous polycaprolactam (polyamide 6 (PA6)) incorporated with manganese oxide (MnO) nanoparticles was fabricated by electrospinning and used as a new fiber coating for headspace-solid phase microextraction (HS-SPME) of the selected phthalate esters (PEs) in water samples prior to GC-μECD. The adsorbent was fully characterized using scanning electron microscopy (SEM), Fourier transform-infrared (FT-IR) spectroscopy and thermogravimetric analysis (TGA). The main parameters that affect the HS-SPME efficiency such as extraction temperature, ionic strength, extraction and desorption times were investigated...
October 5, 2017: Chemosphere
Yanna Wang, Liguang Dou, Hui Zhang
A series of novel nanosheet array-like catalysts Pdx/rGO@CoAl-LDH (x = 0.0098 - 1.9, refers to Pd loading in wt% on ICP, rGO: reduced graphene oxide, LDH: layered double hydroxide) were first prepared via a simple and green lattice atomic-confined in situ reduction of oxidative Pd precursors by the evenly atomic-dispersed reductive Co2+ sites on LDH layers of a nanohybrid rGO@CoAl-LDH with hexagonal LDH nanoplates (~73 nm × 7 nm) interdigitated vertical to the surfaces of rGO layer in both sides, fabricated through a simple citric acid-assisted aqueous-phase coprecipitation method...
October 13, 2017: ACS Applied Materials & Interfaces
Farid Kameche, Alice Six, Fabrice Charra, Anh Tu Ngo, Fabrice Mathevet, Caroline Salzemann, David Kreher, Imad Arfaoui, André-Jean Attias, Christophe Petit
We propose a novel approach to trap 2 nm Pt nanocrystals using nanoporous two-dimensional supramolecular networks for cavity-confined host-guest recognition process. This will be achieved by taking advantage of two features of supramolecular self-assembly at surfaces. First, its capability to allow to the formation of complex 2D architectures, more particularly nanoporous networks, through non-covalent interactions between organic molecular building-blocks. Second, the ability of the nanopores to selectively host and immobilize a large variety of guest species...
October 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Ilaria Bergenti, Giampiero Ruani, Fabiola Liscio, Silvia Milita, Franco Dinelli, Xiaofeng Xu, Ergang Wang, Massimiliano Cavallini
Ferroelectric molecular compounds present great advantages for application in electronics because they combine the high polarization values, comparable with those of inorganic materials, with the flexibility and low cost properties of organic ones. However, some limitations to their applicability are related to the high crystallinity required for deploying the ferroelectricity. In this paper, highly ordered ferroelectric patterned thin films of diisopropylammonium bromide have been successfully fabricated by lithographically controlled wetting technique...
October 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Huizhang Guo, Daniel Klose, Yuhui Hou, Gunnar Jeschke, Ingo Burgert
Titanium dioxide is most widely used in sunscreens because of its strong ultraviolet (UV) light absorbing capabilities and its resistance to discoloration under UV exposure. However, when deposited as a thin film, the high refractive index of titanium dioxide typically results in whiteness and opacity, which limits the use of titanium dioxide for material surfaces, for which long-term natural appearance is of high relevance. Since the whitish appearance is due to the strong light scattering and reflection on the interface of oxide particles and air, one can increase the transparency of TiO2 coatings by forming a continuous TiO2 layer...
October 13, 2017: ACS Applied Materials & Interfaces
Yanmin Zhang, Yuanqi Ding, Lei Xie, Honghong Ma, Xinyi Yao, Chi Zhang, Chunxue Yuan, Wei Xu
Despite the fact that DNA bases have been well-studied on surface, on-surface synthesis of one-dimensional DNA analog through in-situ reactions is still an interesting topic to be investigated. Herein, from the interplay of high-resolution scanning tunneling microscopy (STM) imaging and density functional theory (DFT) calculations, we have delicately designed a halogenated derivative of adenine as precursor to realize the combination of DNA bases and Ullmann reaction, and then successfully synthesized adenine oligomers on Au(111) via Ullmann coupling...
October 13, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Xiaoyu Shi, Zhong-Shuai Wu, Jieqiong Qin, Shuanghao Zheng, Sen Wang, Feng Zhou, Chenglin Sun, Xinhe Bao
Printable supercapacitors are regarded as a promising class of microscale power source, but are facing challenges derived from conventional sandwich-like geometry. Herein, the printable fabrication of new-type planar graphene-based linear tandem micro-supercapacitors (LTMSs) on diverse substrates with symmetric and asymmetric configuration, high-voltage output, tailored capacitance, and outstanding flexibility is demonstrated. The resulting graphene-based LTMSs consisting of 10 micro-supercapacitors (MSs) present efficient high-voltage output of 8...
October 13, 2017: Advanced Materials
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