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Nanomaterials

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https://www.readbyqxmd.com/read/29793089/gold-and-gold-silver-alloy-nanoparticles-enhance-the-myogenic-differentiation-of-myoblasts-through-p38-mapk-signaling-pathway-and-promote-in-vivo-skeletal-muscle-regeneration
#1
Juan Ge, Kai Liu, Wen Niu, Mi Chen, Min Wang, Yumeng Xue, Chuanbo Gao, Peter X Ma, Bo Lei
Under the severe trauma condition, the skeletal muscles regeneration process is inhibited by forming fibrous scar tissues. Understanding the interaction between bioactive nanomaterials and myoblasts perhaps has important effect on the enhanced skeletal muscle tissue regeneration. Herein, we investigate the effect of monodispersed gold and gold-silver nanoparticles (AuNPs and Au-AgNPs) on the proliferation, myogenic differentiation and associated molecular mechanism of myoblasts (C2C12), as well as the in vivo skeletal muscle tissue regeneration...
May 18, 2018: Biomaterials
https://www.readbyqxmd.com/read/29792422/toward-total-synthesis-of-thiolate-protected-metal-nanoclusters
#2
Qiaofeng Yao, Tiankai Chen, Xun Yuan, Jianping Xie
Total synthesis, where desired organic- and/or biomolecules could be produced from simple precursors at atomic precision and with known step-by-step reactions, has prompted centuries-lasting bloom of organic chemistry since its conceptualization in 1828 (Wöhler synthesis of urea). Such expressive science is also highly desirable in nanoscience, since it represents a decisive step toward atom-by-atom customization of nanomaterials for basic and applied research. Although total synthesis chemistry is less established in nanoscience, recent years have witnessed seminal advances and increasing research efforts devoted into this field...
May 24, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29792201/cerium-dioxide-nanoparticles-exacerbate-house-dust-mite-induced-type-ii-airway-inflammation
#3
Kirsty Meldrum, Sarah B Robertson, Isabella Römer, Tim Marczylo, Lareb S N Dean, Andrew Rogers, Timothy W Gant, Rachel Smith, Terry D Tetley, Martin O Leonard
BACKGROUND: Nanomaterial inhalation represents a potential hazard for respiratory conditions such as asthma. Cerium dioxide nanoparticles (CeO2 NPs) have the ability to modify disease outcome but have not been investigated for their effect on models of asthma and inflammatory lung disease. The aim of this study was to examine the impact of CeO2 NPs in a house dust mite (HDM) induced murine model of asthma. RESULTS: Repeated intranasal instillation of CeO2 NPs in the presence of HDM caused the induction of a type II inflammatory response, characterised by increased bronchoalveolar lavage eosinophils, mast cells, total plasma IgE and goblet cell metaplasia...
May 23, 2018: Particle and Fibre Toxicology
https://www.readbyqxmd.com/read/29791240/book-review-neurotoxicity-of-nanomaterials-and-nanomedicine-jiang-xinguo-gao-huile-neurotoxicity-of-nanomaterials-and-nanomedicine-academic-press-2017-358-pp-isbn-978-0-12-804598-5-105-00-eisbn-978-0-12-804620-5-105-00-bundled-hardcopy-and-ebook-180-00
#4
https://www.readbyqxmd.com/read/29791135/optically-active-cdse-dot-cds-rod-nanocrystals-with-induced-chirality-and-circularly-polarized-luminescence
#5
Jiaji Cheng, Junjie Hao, Haochen Liu, Jiagen Li, Junzi Li, Xi Zhu, Xiaodong Lin, Kai Wang, Tingchao He
Ligand-induced chirality in semiconductor nanocrystals (NCs) has attracted attention because of the tunable optical properties of the NCs. Induced circular dichroism (CD) has been observed in CdX (X = S, Se, Te) NCs and their hybrids, but circularly polarized luminescence (CPL) in these fluorescent nanomaterials has been seldom reported. Herein, we describe the successful preparation of L- and D-cysteine-capped CdSe-dot/CdS-rods (DRs) with tunable CD and CPL behaviors and a maximum anisotropic factor (glum) of 4...
May 23, 2018: ACS Nano
https://www.readbyqxmd.com/read/29790554/construction-of-dual-functional-polymer-nanomaterials-with-near-infrared-fluorescence-imaging-and-polymer-prodrug-by-raft-mediated-aqueous-dispersion-polymerization
#6
Chun Tian, Jinyun Niu, Xuerui Wei, Yujie Xu, Lifen Zhang, Zhenping Cheng, Xiulin Zhu
The performance of functional polymer nanomaterials is a vigorously discussed topic in polymer science. We devoted ourselves to investigating polymer nanomaterials based on near-infrared (NIR) fluorescence imaging and polymer prodrug in this study. Aza-boron dipyrromethene (BODIPY) is an important organic dye, having characteristics such as environmental resistance, light resistance, high molar extinction coefficient, and fluorescence quantum yield. We incorporated it into our target monomer, which can be polymerized without changing its parent structure in a polar solvent and copolymerized with water-soluble monomer to improve the solubility of the dye in an aqueous solution...
May 23, 2018: Nanoscale
https://www.readbyqxmd.com/read/29790524/alleviating-luminescence-concentration-quenching-in-lanthanide-doped-caf-2-based-nanoparticles-through-na-ion-doping
#7
Bing Xu, Dongyu Li, Zhen Huang, Chunliang Tang, Wenhao Mo, Ying Ma
Luminescence concentration quenching, mainly due to a cross relaxation (CR) process between lanthanide ions (Ln3+), widely occurs in Ln3+ doped luminescent materials, setting a limit in the dopant content of Ln3+ emitters to withhold the brightness. Here, we introduced Na+ ions into the CaF2 host lattice codoped with Nd3+ emitters that alleviates concentration quenching greatly. And we show that the optimal dopant concentration of Nd3+ in colloidal CaF2:Nd nanoparticles increased from 10 to 30 mol%, resulting in an ∼32 times near-infrared (NIR) (1052 nm) brightness under 800 nm laser irradiation...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29790504/molecularly-imprinted-nanoparticles-for-inhibiting-ribonuclease-in-reverse-transcriptase-polymerase-chain-reaction
#8
Xiaotong Feng, Jon Ashley, Tongchang Zhou, Arnab Halder, Yi Sun
Molecularly imprinted nanoparticles (nanoMIPs) are synthesized via a solid-phase approach using RNase as the template. The feasibility of employing the nanoMIPs as RNase inhibitor is successfully demonstrated in reverse transcriptase polymerase chain reaction (RT-PCR) assays, suggesting the tailor-made nanomaterials are very promising for use in routine biological assays.
May 23, 2018: Analyst
https://www.readbyqxmd.com/read/29787947/supramolecular-proteinaceous-biofilms-as-trapping-sponges-for-biologic-water-treatment-and-durable-catalysis
#9
Xiaochen Wu, Xiangsheng Han, Lili Lv, Mingjie Li, Jun You, Chaoxu Li
Inspired by the bacterial biofilms and chorions of living organisms which are made by proteinaceous assemblies and functional for multi-applications, various artificial protein fibrils-based nanoporous films are developed, and show their potential applications in multiple fields. Here, a simple and environmental friendly method was identified to produce bovine serum albumin (BSA) nanofibrils based biofilms, through a combination of protein fibrillation and reverse dialysis. BSA nanofibrils formed biofilms through intermolecular interactions, the resultant biofilms showed tunable thickness by altering the initial protein amount, good stability in organic and salty solvents, transparency and fluorescence properties, hold high capacity of trapping different substances (e...
May 15, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29787672/oxidized-nanocarbons-tripeptide-supramolecular-hydrogels-shape-matters
#10
Daniel Iglesias, Manuel Melle-Franco, Marina Kurbasic, Michele Melchionna, Michela Abrami, Mario Grassi, Maurizio Prato, Silvia Marchesan
Short peptide hydrogels are attractive biomaterials but typically suffer from limited mechanical properties. Inclusion of other nanomaterials can serve the dual purpose of hydrogel reinforcement and of conferring additional physico-chemical properties ( e.g., self-healing, conductivity), as long as they do not hamper peptide self-assembly. In particular, nanocarbons are ideal candidates and their physico-chemical properties have demonstrated great potential in nanocarbon-polymer gel biomaterials for tissue engineering or drug delivery...
May 22, 2018: ACS Nano
https://www.readbyqxmd.com/read/29787282/regulating-the-uptake-of-viral-nanoparticles-in-macrophage-and-cancer-cells-by-via-a-ph-switch
#11
Hamilton Lee, Candace E Benjamin, Chance M Nowak, Lana Tuong, Raymond P Welch, Zhuo Chen, Madushani Dharmarwardana, Kyle Murray, Leonidas Bleris, Sheena D'Arcy, Jeremiah J Gassensmith
Controlling the uptake of nanomaterials into phagocytes is a challenging problem. We describe an approach to inhibit the cellular uptake by macrophages and HeLa cells of nano-particles derived from bacteriophage Qβ by conjugating negatively charged terminal hexanoic acid moieties onto its surface. Additionally, we show hydrazone linkers can be installed between the surface of Qβ and the terminal hexa-noic acid moieties, resulting in a pH-responsive conjugate that, in acidic conditions, can release the terminal hexanoic acid moiety and allow for the uptake of the Qβ nanoparti-cle...
May 22, 2018: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29787236/investigation-of-the-viability-of-cells-upon-co-exposure-to-gold-and-iron-oxide-nanoparticles
#12
Qian Zhang, Weien Lai, Ting Yin, Chunlei Zhang, Caixia Yue, Jin Cheng, Kan Wang, Yuming Yang, Wolfgang J Parak, Daxiang Cui
Cell lines were exposed either to mixtures of gold and iron oxide nanoparticles, or to a hybrid nanoparticle with gold and iron oxide domain. In case of simultaneous exposure to gold and iron oxide nanoparticles, enhanced toxicity as compared to the exposure to only one type of nanoparticles was observed. Indication was found, that at equivalent concentrations, the hybrid nanoparticles may slightly stronger reduce cell viability than mixtures of both nanoparticle types. The results suggest that composite nanomaterials, in which different materials are present in particle form, need to be analyzed carefully, as not only the concentration of the respective materials, as also their arrangement may influence their toxicity...
May 22, 2018: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29786934/origin-of-photoluminescence-enhancement-of-gold-doped-silver-nanoclusters-importance-of-relativistic-effects-and-heterogeneous-gold-silver-interaction
#13
Xiao-Ying Xie, Pin Xiao, Xiaoyan Cao, Wei-Hai Fang, Ganglong Cui, Michael Franz Dolg
The weak photoluminescence of silver nanoclusters suppresses their broad applications as luminescent nanomaterials. Recent experiments however showed that Au-doping can significantly enhance the photoluminescence intensity of Ag_29 nanoclusters, whereas molecular and physical origins of this effect remain unknown. Therefore we have computationally explored geometric and electronic structures of Ag_29 and its Au-doped Ag_29-xAu_x (x=1-5) nanoclusters in the S_0 and S_1 states. We found that (1) relativistic effects mainly originating from the Au atoms play an important role in enhancing the fluorescence intensity, especially for highly doped Ag_26Au_3, Ag_25Au_4, and Ag_24Au_5; (2) heteronuclear Au-Ag bonds can increase stabilities and regulate fluorescence intensities of isomers of these Au-doped nanoclusters...
May 22, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29786727/rational-design-of-multi-functional-gold-nanoparticles-with-controlled-biomolecule-adsorption-a-multi-method-approach-for-in-depth-characterization
#14
Isaac Ojea-Jiménez, Robin Capomaccio, Inês Osório, Dora Mehn, Giacomo Ceccone, Rohanah Hussain, Giuliano Siligardi, Pascal Colpo, François Rossi, Douglas Gilliland, Luigi Calzolai
Multi-functionalized nanoparticles are of great interest in biotechnology and biomedicine, especially for diagnostic and therapeutic purposes. However, at the moment the characterization of complex, multi-functional nanoparticles is still challenging and this hampers the development of advanced nanomaterials for biological applications. In this work, we have designed a model system consisting of gold nanoparticles functionalized with two differentially-terminated poly(ethylene oxide) ligands, providing both "stealth" properties and protein-binding capabilities to the nanoparticles...
May 22, 2018: Nanoscale
https://www.readbyqxmd.com/read/29786601/heterogeneous-photocatalysis-and-its-potential-applications-in-water-and-wastewater-treatment-a-review
#15
Syed N Ahmed, Waseem Haider
There has been a considerable amount of research in the development of sustainable water treatment techniques capable of improving the quality of water. Unavailability of drinkable water is a crucial issue especially in regions where conventional drinking water treatment systems fail to eradicate aquatic pathogens, toxic metal ions and industrial waste. The research and development in this area have given rise to a new class of processes called Advanced Oxidation Processes, particularly in the form of heterogeneous photocatalysis, which converts photon energy into chemical energy...
May 22, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29786444/exploring-the-confinement-effect-of-carbon-nanotubes-on-the-electrochemical-properties-of-prussian-blue-nanoparticles
#16
Ti-Wei Chen, Zhong-Qiu Li, Kang Wang, Feng-Bin Wang, Xing-Hua Xia
A novel and efficient photochemical method has been proposed for the encapsulation of Prussian blue nanoparticles (PBNPs) inside the channels of carbon nanotubes (PB-in-CNTs) in an acidic ferrocyanide solution under UV/Vis illumination and the confinement effect of CNTs on the electrochemical properties of PBNPs is systematically explored. PB-in-CNTs shows a faster electron transfer process, an enhanced electrocatalytic activity toward the reduction of H2O2 and an increased anti-base ability compared to PBNPs loaded outside of CNTs (PB-out-CNTs)...
May 22, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29785593/a-study-of-biochemical-route-on-construction-of-waste-battery-ferrite-applying-for-nickel-removal
#17
Zhirui Niu, Shaokang Zhang, Lin Zhu
Mn-Zn ferrite (Mn1 - x Zn x Fe2 O4 , x = 0.2, 0.4, 0.6, and 0.8) nanomaterials were prepared by bioleaching and hydrothermal synthesis from waste Zn-Mn batteries. The materials were characterized by XRD, SEM, BET, VSM, CEC, and isoelectric point. It turned out when x = 0.4, synthesized Mn-Zn ferrite had best performance which was nanoferrite crystal structure with a specific surface area that reached 37.77 m2 /g, the saturation magnetization was 62.85 emu/g, and isoelectric point and the CEC value were 7...
May 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29785483/application-of-metallic-nanomaterials-in-nanomedicine
#18
Mahi R Singh
In this chapter, we explain why metallic nanomaterials are used in nanomedicine. We have shown that the electron density in metallic nanomaterials oscillates and creates electron density waves. When laser light falls on metallic nanoparticles, light interacts with electron density waves. According to Einstein, light, which is electromagnetic waves, consists of particles called photons. Similarly, electron density waves are also made of particles called surface plasmons. Therefore, photons from laser light and surface plasmons from metallic nanostructures interact with each other and create new particles called surface plasmon polaritons...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29784775/recombinant-escherichia-coli-as-a-biofactory-for-various-single-and-multi-element-nanomaterials
#19
Yoojin Choi, Tae Jung Park, Doh C Lee, Sang Yup Lee
Nanomaterials (NMs) are mostly synthesized by chemical and physical methods, but biological synthesis is also receiving great attention. However, the mechanisms for biological producibility of NMs, crystalline versus amorphous, are not yet understood. Here we report biosynthesis of 60 different NMs by employing a recombinant Escherichia coli strain coexpressing metallothionein, a metal-binding protein, and phytochelatin synthase that synthesizes a metal-binding peptide phytochelatin. Both an in vivo method employing live cells and an in vitro method employing the cell extract are used to synthesize NMs...
May 21, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29783786/graphene-based-nanomaterials-for-tissue-engineering-in-the-dental-field
#20
REVIEW
Riccardo Guazzo, Chiara Gardin, Gloria Bellin, Luca Sbricoli, Letizia Ferroni, Francesco Saverio Ludovichetti, Adriano Piattelli, Iulian Antoniac, Eriberto Bressan, Barbara Zavan
The world of dentistry is approaching graphene-based nanomaterials as substitutes for tissue engineering. Apart from its exceptional mechanical strength, electrical conductivity and thermal stability, graphene and its derivatives can be functionalized with several bioactive molecules. They can also be incorporated into different scaffolds used in regenerative dentistry, generating nanocomposites with improved characteristics. This review presents the state of the art of graphene-based nanomaterial applications in the dental field...
May 20, 2018: Nanomaterials
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