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https://www.readbyqxmd.com/read/27922204/encapsulation-of-bimetallic-metal-nanoparticles-into-robust-zr-based-metal-organic-frameworks-evaluation-of-the-catalytic-potential-for-size-selective-hydrogenation
#1
Christoph Rösler, Stefano Dissegna, Victor Lopez Rechac, Max Kauer, Penghu Guo, Stuart Turner, Kevin Ollegott, Hirokazu Kobayashi, Tomokazu Yamamoto, Daniel Peeters, Yuemin Wang, Syo Matsumura, Gustaaf Van Tendeloo, Hiroshi Kitagawa, Martin Muhler, Francesc X Llabrés I Xamena, Roland A Fischer
The realization of metal NPs with bimetallic character and distinct composition for specific catalytic applications is an intensively studied field. Due to the synergy between metals, most of the bimetallic particles exhibit unique properties, only hardly provided by the individual monometallic counterparts. However, as small sized NPs possess high surface energy, agglomeration during catalytic reactions is favored. Sufficient stabilization can be achieved by confinement of NPs in porous support materials. In this sense, especially MOFs gained a lot of attention during the last years, however, encapsulation of bimetallic species remains challenging...
December 6, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27922106/in-situ-one-step-synthesis-of-carbon-encapsulated-naked-magnetic-metal-nanoparticles-conducted-without-additional-reductants-and-agents
#2
Jun Kang, Yeonwon Kim, Hye-Min Kim, Xiulan Hu, Nagahiro Saito, Jae-Hyuk Choi, Myeong-Hoon Lee
C-encapsulated highly pure Ni, Co, and Fe magnetic nanoparticles (MNPs/C) were synthesized by an innovative one-step in-situ plasma in liquid method (solution plasma processing, SPP) without any additional reductants, agents, or treatment. Successful encapsulation of MNPs was demonstrated by using inductively coupled plasma-atomic emission spectrometry and cyclic voltammetry techniques. The obtained X-ray diffraction patterns and transmission electron microscopy images corresponded to MNPs with average diameters of 5 nm and good crystalline structure...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27922086/photoelectrochemical-detection-of-alpha-fetoprotein-based-on-zno-inverse-opals-structure-electrodes-modified-by-ag2s-nanoparticles
#3
Yandong Jiang, Dali Liu, Yudan Yang, Ru Xu, Tianxiang Zhang, Kuang Sheng, Hongwei Song
In this work, a new photoelectrochemical biosensor based on Ag2S nanoparticles (NPs) modified macroporous ZnO inverse opals structure (IOs) was developed for sensitive and rapid detection of alpha fetal protein (AFP). Small size and uniformly dispersed Ag2S NPs were prepared using the Successive Ionic Layer Adsorption And Reaction (SILAR) method, which were adsorbed on ZnO IOs surface and frame work as matrix for immobilization of AFP. The composite structure of ZnO/Ag2S expanded the scope of light absorption to long wavelength, which can make full use of the light energy...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27921355/catalysis-driven-self-thermophoresis-of-janus-plasmonic-nanomotors
#4
Weiwei Qin, Tianhuan Peng, Yanjing Gao, Fei Wang, Xiaocai Hu, Kun Wang, Jiye Shi, Di Li, Jicun Ren, Chunhai Fan
It is highly demanding to design active nanomotors that can move in response to specific signals with controllable rate and direction. A catalysis-driven nanomotor was constructed by designing catalytically and plasmonically active Janus gold nanoparticles (Au NPs), which generate an asymmetric temperature gradient of local solvent surrounding NPs in catalytic reactions. The self-thermophoresis behavior of the Janus nanomotor is monitored from its inherent plasmonic response. The diffusion coefficient of the self-thermophoresis motion is linearly dependent on chemical reaction rate, as described by a stochastic model...
December 6, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27921346/bottom-up-meets-top-down-patchy-hybrid-nonwovens-as-an-efficient-catalysis-platform
#5
Judith Schöbel, Matthias Burgard, Christian Hils, Roland Dersch, Martin Dulle, Kirsten Volk, Matthias Karg, Andreas Greiner, Holger Schmalz
Heterogeneous catalysis with supported nanoparticles (NPs) is a highly active field of research. However, the efficient stabilization of NPs without deteriorating their catalytic activity is challenging. By combining top-down (coaxial electrospinning) and bottom-up (crystallization-driven self-assembly) approaches, we prepared patchy nonwovens with functional, nanometer-sized patches on the surface. These patches can selectively bind and efficiently stabilize gold nanoparticles (AuNPs). The use of these AuNP-loaded patchy nonwovens in the alcoholysis of dimethylphenylsilane led to full conversion under comparably mild conditions and in short reaction times...
December 6, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27920884/novel-combinations-of-synthesized-zno-nps-and-ceftazidime-evaluation-of-their-activity-against-standards-and-new-clinically-isolated-pseudomonas-aeruginosa
#6
Elham Isaei, Shahla Mansouri, Fereshteh Mohammadi, Sadegh Taheritarigh, Zohreh Mohammadi
BACKGROUND: Antibiotic resistant bacteria can be considered as a main problem in infection management. Zinc oxide nanoparticles (ZnO NPs), individually or in combination with antibiotics, can be considered as good candidates for struggling against drug resistant bacteria. METHODS: In this study, Zinc oxide nanoparticles were synthesized using sol-gel method in low temperature as a cost effective procedure and characterized by X-ray diffraction and Scanning Electron Microscopy...
October 2016: Avicenna Journal of Medical Biotechnology
https://www.readbyqxmd.com/read/27920532/the-effect-of-magnetic-nanoparticles-on-neuronal-differentiation-of-induced-pluripotent-stem-cell-derived-neural-precursors
#7
Klára Jiráková, Monika Šeneklová, Daniel Jirák, Karolína Turnovcová, Magda Vosmanská, Michal Babič, Daniel Horák, Pavel Veverka, Pavla Jendelová
INTRODUCTION: Magnetic resonance (MR) imaging is suitable for noninvasive long-term tracking. We labeled human induced pluripotent stem cell-derived neural precursors (iPSC-NPs) with two types of iron-based nanoparticles, silica-coated cobalt zinc ferrite nanoparticles (CZF) and poly-l-lysine-coated iron oxide superparamagnetic nanoparticles (PLL-coated γ-Fe2O3) and studied their effect on proliferation and neuronal differentiation. MATERIALS AND METHODS: We investigated the effect of these two contrast agents on neural precursor cell proliferation and differentiation capability...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27920530/blockage-of-both-the-extrinsic-and-intrinsic-pathways-of-diazinon-induced-apoptosis-in-patu-cells-by-magnesium-oxide-and-selenium-nanoparticles
#8
Mahdi Shiri, Mona Navaei-Nigjeh, Maryam Baeeri, Mahban Rahimifard, Hossein Mahboudi, Ahmad Reza Shahverdi, Abbas Kebriaeezadeh, Mohammad Abdollahi
Diazinon (DZ) is an organophosphorus insecticide that acts as an acetylcholinesterase inhibitor. It is important to note that it can induce oxidative stress, lipid peroxidation, diabetic disorders, and cytotoxicity. Magnesium oxide (MgO) and selenium nanoparticles (Se NPs) showed promising protection against oxidative stress, lipid peroxidation, cytotoxicity, and diabetic disorders. Therefore, this study was conducted to explore the possible protective mechanisms of MgO and Se NPs against DZ-induced cytotoxicity in PaTu cell line...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27920526/in-vitro-inflammatory-effects-of-hard-metal-wc-co-nanoparticle-exposure
#9
Andrea L Armstead, Bingyun Li
Identifying the toxicity of nanoparticles (NPs) is an important area of research as the number of nanomaterial-based consumer and industrial products continually rises. In addition, the potential inflammatory effects resulting from pulmonary NP exposure are emerging as an important aspect of nanotoxicity. In this study, the toxicity and inflammatory state resulting from tungsten carbide-cobalt (WC-Co) NP exposure in macrophages and a coculture (CC) of lung epithelial cells (BEAS-2B) and macrophages (THP-1) at a 3:1 ratio were examined...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27920524/monte-carlo-simulations-guided-by-imaging-to-predict-the-in-vitro-ranking-of-radiosensitizing-nanoparticles
#10
Paul Retif, Aurélie Reinhard, Héna Paquot, Valérie Jouan-Hureaux, Alicia Chateau, Lucie Sancey, Muriel Barberi-Heyob, Sophie Pinel, Thierry Bastogne
This article addresses the in silico-in vitro prediction issue of organometallic nanoparticles (NPs)-based radiosensitization enhancement. The goal was to carry out computational experiments to quickly identify efficient nanostructures and then to preferentially select the most promising ones for the subsequent in vivo studies. To this aim, this interdisciplinary article introduces a new theoretical Monte Carlo computational ranking method and tests it using 3 different organometallic NPs in terms of size and composition...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27920522/incorporation-of-heparin-binding-proteins-into-preformed-dextran-sulfate-chitosan-nanoparticles
#11
Paula Zaman, Julia Wang, Adam Blau, Weiping Wang, Tina Li, Daniel S Kohane, Joseph Loscalzo, Ying-Yi Zhang
Incorporation of proteins into dextran sulfate (DS)-chitosan (CS) nanoparticles (DSCS NPs) is commonly performed using entrapment procedures, in which protein molecules are mixed with DS and CS until particle formation occurs. As DS is an analog of heparin, the authors examined whether proteins could be directly incorporated into preformed DSCS NPs through a heparin binding domain-mediated interaction. The authors formulated negatively-charged DSCS NPs, and quantified the amount of charged DS in the outer shell of the particles...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27920248/use-of-proton-pump-inhibitors-among-older-australians-national-quality-improvement-programmes-have-led-to-sustained-practice-change
#12
Nicole L Pratt, Lisa M Kalisch Ellett, Janet K Sluggett, Svetla V Gadzhanova, Emmae N Ramsay, Mhairi Kerr, Vanessa T LeBlanc, John D Barratt, Elizabeth E Roughead
OBJECTIVE: To evaluate the impact of national multifaceted initiatives to improve use of proton pump inhibitors (PPIs) on the use of PPIs among older Australians. DESIGN: Interrupted time series analysis using administrative health claims data from the Australian Government Department of Veterans' Affairs (DVA). SETTING: Australia. PARTICIPANTS: All veterans and dependents who received PPIs between January 2003 and December 2013...
December 4, 2016: International Journal for Quality in Health Care
https://www.readbyqxmd.com/read/27919810/immobilization-of-indigenous-holocellulase-on-iron-oxide-fe2o3-nanoparticles-enhanced-hydrolysis-of-alkali-pretreated-paddy-straw
#13
Ajay Kumar, Surender Singh, Rameshwar Tiwari, Renu Goel, Lata Nain
The holocellulase from Aspergillus niger SH3 was characterized and found to contain 125 proteins including cellulases (26), hemicellulases (21), chitinases (10), esterases (6), amylases (4) and hypothetical protein (32). The crude enzyme was immobilized on five different nanoparticles (NPs) via physical adsorption and covalent coupling methods. The enzyme-nanoparticle complexes (ENC) were screened for protein binding, enzymatic activities and immobilization efficiency. Magnetic enzyme-nanoparticle complexes (MENC) formulation showed higher immobilization efficiency (60- 80%) for most of the enzymes...
December 2, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27919801/folic-acid-capped-pegylated-magnetic-nanoparticles-enter-cancer-cells-mostly-via-clathrin-dependent-endocytosis
#14
Emilie Allard-Vannier, Katel Hervé-Aubert, Karine Kaaki, Thibaut Blondy, Anastasia Shebanova, Konstantin V Shaitan, Anastasia A Ignatova, Marie-Louise Saboungi, Alexey V Feofanov, Igor Chourpa
BACKGROUND: This work is focused on mechanisms of uptake in cancer cells of rationally designed, covalently assembled nanoparticles, made of superparamagnetic iron oxide nanoparticles (SPIONs), fluorophores (doxorubicin or Nile Blue), polyethylene glycol (PEG) and folic acid (FA), referred hereinafter as SFP-FA. METHODS: SFP-FA were characterized by DLS, zetametry and fluorescence spectroscopy. The SFP-FA uptake in cancer cells was monitored using fluorescence-based methods like fluorescence-assisted cell sorting, LSCM with single-photon and two-photon excitation...
December 2, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27919267/targeted-drug-delivery-of-near-ir-fluorescent-doxorubicin-conjugated-poly-ethylene-glycol-bisphosphonate-nanoparticles-for-diagnosis-and-therapy-of-primary-and-metastatic-bone-cancer-in-a-mouse-model
#15
S Rudnick-Glick, E Corem-Salkmon, I Grinberg, S Margel
BACKGROUND: Most primary and metastatic bone tumors demonstrate increased osteoclast activity and bone resorption. Current treatment is based on a combination of surgery, radiotherapy and chemotherapy. Severe side effects are associated with chemotherapy due to use of high dosage and nonspecific uptake. Bisphosphonates have a strong affinity to Ca(2+) ions and are widely used in the treatment of bone disorders. RESULTS: We have engineered a unique biodegradable bisphosphonate nanoparticle (NPs) bearing two functional surface groups: (1) primary amine groups for covalent attachment of a dye/drug (e...
December 5, 2016: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/27919215/current-strategies-in-modification-of-plga-based-gene-delivery-system
#16
Mohammad Ramezani, Mahboubeh Ebrahimian, Maryam Hashemi
The successful gene therapy has been limited by safe and efficient delivery of nucleic acid to the target cells. Poly (d,l-lactide-co-glycolide) (PLGA) nanoparticles (NPs) are able to deliver drugs and gene efficiently. This formulation has several advantages in comparison with other formulations including improvement of solubility, stability, controlling of degradation and release of the entrapped agents. For application of PLGA as gene carrier, there exist many challenges. PLGA nanoparticles could protect the encapsulated DNA from in vivo degradation but the DNA release is slowl and their negative charge acts as a barrier to DNA incorporation and delivery...
December 5, 2016: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/27918990/effects-of-tripolyphosphate-on-cellular-uptake-and-rna-interference-efficiency-of-chitosan-based-nanoparticles-in-raw-264-7-macrophages
#17
Bo Xiao, Panpan Ma, Lijun Ma, Qiubing Chen, Xiaoying Si, Lewins Walter, Didier Merlin
Tumor necrosis factor-α (TNF-α) is a major pro-inflammatory cytokine that is mainly secreted by macrophages during inflammation. Here, we synthesized a series of N-(2-hydroxy)propyl-3-trimethyl ammonium chitosan chlorides (HTCCs), and then used a complex coacervation technique or tripolyphosphate (TPP)-assisted ionotropic gelation strategy to complex the HTCCs with TNF-α siRNA (siTNF) to form nanoparticles (NPs). The resultant NPs had a desirable particle size (210-279nm), a slightly positive zeta potential (14-22mV), and negligible cytotoxicity against Raw 264...
November 26, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27918973/long-term-effects-of-cupric-oxide-nanoparticles-cuo-nps-on-the-performance-microbial-community-and-enzymatic-activity-of-activated-sludge-in-a-sequencing-batch-reactor
#18
Sen Wang, Zhiwei Li, Mengchun Gao, Zonglian She, Bingrui Ma, Liang Guo, Dong Zheng, Yangguo Zhao, Chunji Jin, Xuejiao Wang, Feng Gao
The long-term effects of cupric oxide nanoparticles (CuO NPs) on the performance, microbial activity and microbial community of activated sludge were investigated in a sequencing batch reactor (SBR). The SBR performance had no evident change at 0-10 mg/L CuO NPs, whereas the CuO NPs concentration at 30-60 mg/L affected the COD, NH4(+)-N and soluble orthophosphate (SOP) removal, nitrogen and phosphorus removal rate and microbial enzymatic activity of activated sludge. Some CuO NPs might be absorbed on the surface of activated sludge or penetrate the microbial cytomembrane into the microbial cell interior of activated sludge...
December 2, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27918967/nanoencapsulation-an-efficient-and-promising-approach-to-maximize-wound-healing-efficacy-of-curcumin-a-review-of-new-trends-and-state-of-the-art
#19
REVIEW
Zahid Hussain, Hnin Ei Thu, Shiow-Fern Ng, Shahzeb Khan, Haliza Katas
Wound healing is a multifarious and vibrant process of replacing devitalized and damaged cellular structures, leading to restoration of the skin's barrier function, re-establishment of tissue integrity, and maintenance of the internal homeostasis. Curcumin (CUR) and its analogs have gained widespread recognition due to their remarkable anti-inflammatory, anti-infective, anticancer, immunomodulatory, antioxidant, and wound healing activities. However, their pharmaceutical significance is limited due to inherent hydrophobic nature, poor water solubility, low bioavailability, chemical instability, rapid metabolism and short half-life...
November 30, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27918604/real-time-naked-eye-multiplex-detection-of-toxins-and-bacteria-using-aiegens-with-the-assistance-of-graphene-oxide
#20
Ruoyu Zhang, Xiaolei Cai, Guangxue Feng, Bin Liu
Toxins and bacteria in water or food pose a threat to human life and could potentially be exploited for bioterrorism. Real-time naked-eye detection of these contaminants is highly desirable to provide a direct and simple analytical method and address the challenges of the existing strategies. Using the detection of ricin and B. subtilis as an example, a naked-eye multiplex detection model is established. In this work, a green fluorogen with aggregation-induced emission (AIE) characteristics was encapsulated in silica nanoshells...
December 5, 2016: Faraday Discussions
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