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https://www.readbyqxmd.com/read/28549325/graphene-oxide-in-the-water-environment-could-affect-tetracycline-antibiotic-resistance
#1
Mei-Ting Guo, Guo-Sheng Zhang
In recent years, the influence of new materials like nanoparticles in the water environment on biological substances has been widely studied. Antibiotic resistance genes (ARGs) represent a new type of pollutant in the environment. Graphene oxide (GO), as a nano material, because of its unique structure, may have an impact on antibiotic resistance bacteria (ARB) and ARGs; however the research in this area is rarely reported. Therefore, this study mainly investigated the effects of GO on bacterial antibiotic resistance...
May 3, 2017: Chemosphere
https://www.readbyqxmd.com/read/28549267/the-construction-of-a-novel-nucleic-acids-detection-microplatform-based-on-the-nset-for-one-step-detecting-tk1-dna-and-microrna-21
#2
Jian Zhang, Qian Zhao, Yudong Wu, Bo Zhang, Weipan Peng, Jiafang Piao, Yurui Zhou, Weichen Gao, Xiaoqun Gong, Jin Chang
Microbeads-based microchip technology has become the potential for a new generation of nucleic acids detection in a high-throughput and sensitive manner. However the specificity and operational complexity limit the microchip applied in nucleic acids detection. Herein, in this work, we designed a kind of gold-nanoparticles coated polystyrene microbeads as microplatform conjugating with the molecular beacons as probes. Due to the nanoparticle surface energy transfer of gold-nanoparticles, the fluorescence of dye on one end of molecular beacons was effectively quenched...
May 23, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28549266/self-cascade-reaction-catalyzed-by-cuo-nanoparticle-based-dual-functional-enzyme-mimics
#3
Ai-Ling Hu, Hao-Hua Deng, Xiao-Qing Zheng, Yan-Yu Wu, Xiu-Ling Lin, Ai-Lin Liu, Xing-Hua Xia, Hua-Ping Peng, Wei Chen, Guo-Lin Hong
It is desirable but challenging to assemble various biomimetic properties into a functional catalytic cascade system. In this work, cupric oxide nanoparticles were investigated as oxidase mimics for the aerobic oxidation of cysteine to cystine with the generation of hydrogen peroxide. Coupling this property with the peroxidase-like activity of CuO nanoparticles, we constructed a self-organized cascade reaction system based on a single-component nanozyme, which includes the oxidation of cysteine to yield cystine and hydrogen peroxide and the hydrogen peroxide-mediated oxidation of terephthalic acid to produce a fluorescence change...
May 19, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28549217/surface-enhanced-raman-scattering-active-gold-nanoparticles-with-enzyme-mimicking-activities-for-measuring-glucose-and-lactate-in-living-tissues
#4
Yihui Hu, Hanjun Cheng, Xiaozhi Zhao, Jiangjiexing Wu, Faheem Muhammad, Shichao Lin, Jian He, Liqi Zhou, Chengping Zhang, Yu Deng, Peng Wang, Zhengyang Zhou, Shuming Nie, Hui Wei
Gold nanoparticles (AuNPs) with simultaneous plasmonic and biocatalytic properties provide a promising approach to developing versatile bioassays. However, the combination of AuNPs' intrinsic enzyme mimicking properties with their surface-enhanced Ra-man scattering (SERS) activities has yet to be explored. Here we designed a peroxidase mimicking nanozyme by in situ growing AuNPs into a highly porous and thermally stable metal-organic framework (MOF) called MIL-101. The obtained AuNPs@MIL-101 nanozymes acted as the peroxidase mimics to oxidize Raman inactive reporter leucomalachite green (LMG) into the active malachite green (MG) with hydrogen peroxide, and simultaneously as the SERS substrates to enhance the Raman signals of the as-produced MG...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28548842/engineering-the-composition-and-structure-of-bimetallic-au-cu-alloy-nanoparticles-in-carbon-nanofibers-self-supported-electrode-materials-for-electrocatalytic-water-splitting
#5
Juan Wang, Han Zhu, Danni Yu, JiaWei Chen, JiaDong Chen, Ming Zhang, LiNa Wang, MingLiang Du
The bimetallic Au-Cu alloy nanoparticles have been constructed in electrospun carbon nanofibers (Au-Cu/CNFs), employing as high efficient hydrogen evolution reaction (HER) electrode. The morphology, structure and composition of bimetallic Au-Cu alloy can be controlled by adjusting the precursor nanofibers through a facile approach. With the increased Cu contents, the Au-Cu alloy have a transition from homogenous AuCu3 alloy phase to Au3Cu phase with Cu shell. The self-supported bimetallic Au-Cu/CNFs hybrid can be directly employed as electrodes materials for water splitting and it showed excellent electrochemical activity, including long-term stability, high exchange current density and low overpotential...
May 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28548835/rapid-deposition-of-uniform-polydopamine-coatings-on-nanoparticle-surfaces-with-controllable-thickness
#6
Nazar Orishchin, Cameron C Crane, Matthew Brownell, Tengjiao Wang, Samuel Jenkins, Min Zou, Arun Nair, Jingyi Chen
Polydopamine is a bioinspired, versatile material that can adhere to bulk and nanoscale surfaces made of disparate materials to improve their physical and chemical properties in many applications. The typical methods to coat polydopamine on the nanoparticle substrates usually take several hours to a day. This work successfully applies a dispersion method to form a controllable, uniform coating on a nanoparticle surface within minutes. Using plasmonic Ag nanoparticles as a substrate, the coating thickness can be monitored using a spectroscopic method based on the extinction peak shifts of the Ag nanoparticles...
May 26, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28548828/screening-of-pro-asp-sequences-exposed-on-bacteriophage-m13-as-an-ideal-anchor-for-gold-nanocubes
#7
Hwa Kyoung Lee, Yujean Lee, Hyori Kim, Hye-Eun Lee, Hyejin Chang, Ki Tae Nam, Dae Hong Jeong, Junho Chung
Bacteriophages are thought to be ideal vehicles for linking antibodies to nanoparticles. Here, we define the sequence of peptides exposed as a fusion protein on M13 bacteriophages to yield optimal binding of gold nanocubes and efficient bacteriophage amplification. We generated five helper bacteriophage libraries using AE(X)2DP, AE(X)3DP, AE(X)4DP, AE(X)5DP, and AE(X)6DP as the exposed portion of pVIII, in which X was a randomized amino acid residue encoded by the nucleotide sequence NNK. Efficient phage amplification was achievable only in the AE(X)2DP, AE(X)3DP, and AE(X)4DP libraries...
May 26, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28548503/modeling-evaporation-and-particle-assembly-in-colloidal-droplets
#8
Mingfei Zhao, Xin Yong
Evaporation-induced assembly of nanoparticles in a drying droplet is of great importance in many engineering applications, including printing, coating and thin film processing. The investigation of particle dynamics in evaporating droplets can provide fundamental hydrodynamic insight for revealing the processing-structure relationship in the particle self-organization induced by solvent evaporation. We develop a free-energy-based multiphase lattice Boltzmann method coupled with Brownian dynamics to simulate evaporating colloidal droplets on solid substrates with specified wetting properties...
May 26, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28548489/glycosaminoglycans-specific-cell-targeting-and-imaging-using-fluorescent-nanodiamonds-coated-with-viral-envelope-proteins
#9
Minh D Pham, Chandra Prakash Epperla, Chia-Lung Hsieh, Wen Chang, Huan-Cheng Chang
Understanding virus-host interactions is crucial for vaccine development. This study investigates such interactions using fluorescent nanodiamonds (FNDs) coated with vaccinia envelope proteins as the model system. To achieve this goal, we noncovalently conjugated 100-nm FND with A27(aa 21-84), a recombinant envelope protein of vaccinia virus, for glycosaminoglycans (GAGs)-specific targeting and imaging of living cells. Another recombinant protein A27(aa 33-84) that removes the GAGs-binding sequences was also used for comparison...
May 26, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28548481/isolation-of-phenotypically-distinct-cancer-cells-using-nanoparticle-mediated-sorting
#10
Brenda Green, Leyla Kermanshah, Mahmoud Labib, Sharif Ahmed, Pamuditha Silva, Laili Mahmoudian, I-Hsin Chang, Reza M Mohamadi, Jonathan V Rocheleau, Shana O Kelley
Isolating subpopulations of heterogeneous cancer cells is an important capability for the meaningful characterization of circulating tumor cells at different stages of tumor progression and during epithelial to mesenchymal transition (EMT). Here, we describe a two-dimensional separation approach that yields phenotypically-distinct subpopulations of cancer cells. Magnetic nanoparticles coated with antibodies against the epithelial cell adhesion molecule (EpCAM) are used to enrich cancer cells in a microfluidic platform...
May 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28548289/effects-of-food-borne-nanomaterials-on-gastrointestinal-tissues-and-microbiota
#11
REVIEW
Hans Bouwmeester, Meike van der Zande, Mark A Jepson
Ingestion of engineered nanomaterials is inevitable due to their addition to food and prevalence in food packaging and domestic products such as toothpaste and sun cream. In the absence of robust dosimetry and particokinetic data, it is currently challenging to accurately assess the potential toxicity of food-borne nanomaterials. Herein, we review current understanding of gastrointestinal uptake mechanisms, consider some data on the potential for toxicity of the most commonly encountered classes of food-borne nanomaterials (including TiO2 , SiO2, ZnO, and Ag nanoparticles), and discuss the potential impact of the luminal environment on nanoparticle properties and toxicity...
May 26, 2017: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
https://www.readbyqxmd.com/read/28548180/efficient-all-p-type-heterojunction-photocathodes-for-photoelectrochemical-water-splitting
#12
Xue Lu, Zhifeng Liu
In this paper, Co3O4 nanostructures with different morphologies (nanoparticles (NPs), nanosheets (NSs) and nanocubes (NCs)) are directly grown on an ITO substrate using a hydrothermal method. Sb2S3 is loaded onto Co3O4 to construct a Co3O4/Sb2S3 heterojunction, which is used as an all p-type photocathode for photoelectrochemical (PEC) water splitting for the first time. The specific morphologies of Co3O4 have been discussed in detail. The improved PEC properties of the Co3O4/Sb2S3 heterojunction are characterized...
May 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28548170/efficient-quantum-dot-light-emitting-diodes-with-a-zn0-85mg0-15o-interfacial-modification-layer
#13
Yizhe Sun, Yibin Jiang, Huiren Peng, Jiangliu Wei, Shengdong Zhang, Shuming Chen
Efficient inverted quantum-dot (QD) light-emitting diodes (LEDs) are demonstrated by using 15% Mg doped ZnO (Zn0.85Mg0.15O) as an interfacial modification layer. By doping Mg into ZnO, the conduction band level, the density of oxygen vacancies and the conductivity of the ZnO can be tuned. To suppress excess electron injection, a 13 nm Zn0.85Mg0.15O interlayer with a relatively higher conduction band edge and lower conductivity is inserted between the ZnO electron transport layer and QD light-emitting layer, which improves the balance of charge injection and blocks the non-radiative pathway...
May 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28548161/click-co-sandwich-terminated-dendrimers-as-polyhydride-reservoirs-and-micellar-templates
#14
Amalia Rapakousiou, Colette Belin, Lionel Salmon, Jaime Ruiz, Didier Astruc
Neutral click metallodendrimers with [Co(I)(η(4)-cyclopentadiene)(η(5)-cyclopentadienyl)] termini are synthesized by reduction of dendrimers with 9, 27 or 81 cobalticenium termini and serve as polyhydride reservoirs and reductants; for instance, they reduce proton sources to H2 and Au(III) to micellized capsules of gold nanoparticles.
May 26, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28548158/visible-light-assisted-hydrogen-generation-from-complete-decomposition-of-hydrous-hydrazine-using-rhodium-modified-tio2-photocatalysts
#15
Pawan Kumar, Anurag Kumar, Clémence Queffélec, Dietrich Gudat, Qi Wang, Suman L Jain, Rabah Boukherroub, Sabine Szunerits
Hydrogen is considered to be an ideal energy carrier, which produces only water when combined with oxygen and thus has no detrimental effect on the environment. While the catalytic decomposition of hydrous hydrazine for the production of hydrogen is well explored, little is known about its photocatalytic decomposition. The present paper describes a highly efficient photochemical methodology for the production of hydrogen through the decomposition of aqueous hydrazine using titanium dioxide nanoparticles modified with a Rh(i) coordinated catechol phosphane ligand (TiO2-Rh) as a photocatalyst under visible light irradiation...
May 26, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28548103/an-aavp-based-solid-phase-transducing-matrix-for-transgene-delivery-potential-for-translational-applications
#16
T L Smith, G R Souza, R L Sidman, W Arap, R Pasqualini
A hybrid vector of adeno-associated virus and phage (termed AAVP) has been introduced as a platform for systemic ligand-directed delivery of transgenes to tumors over the past decade. A series of studies have evaluated the AAVP platform for potential theranostic or purely therapeutic applications in several tumor models. Sufficient ligand-directed tumor targeting consistently resulted in specific molecular-genetic imaging and/or anti-tumor responses to 'suicide' transgene delivery. However, efforts to optimize transduction efficiency are still ongoing...
May 26, 2017: Cancer Gene Therapy
https://www.readbyqxmd.com/read/28548100/hierarchically-structured-lithium-titanate-for-ultrafast-charging-in-long-life-high-capacity-batteries
#17
Mateusz Odziomek, Frédéric Chaput, Anna Rutkowska, Konrad Świerczek, Danuta Olszewska, Maciej Sitarz, Frédéric Lerouge, Stephane Parola
High-performance Li-ion batteries require materials with well-designed and controlled structures on nanometre and micrometre scales. Electrochemical properties can be enhanced by reducing crystallite size and by manipulating structure and morphology. Here we show a method for preparing hierarchically structured Li4Ti5O12 yielding nano- and microstructure well-suited for use in lithium-ion batteries. Scalable glycothermal synthesis yields well-crystallized primary 4-8 nm nanoparticles, assembled into porous secondary particles...
May 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28547766/local-release-of-vegf-using-fiber-mats-enables-effective-transplantation-of-layered-cardiomyocyte-sheets
#18
Kenichi Nagase, Yuhei Nagumo, Miri Kim, Hee-Jung Kim, Hei-Won Kyung, Hye-Jin Chung, Hidekazu Sekine, Tatsuya Shimizu, Hideko Kanazawa, Teruo Okano, Seung-Jin Lee, Masayuki Yamato
Cell sheet transplantation is a key tissue engineering technology. A vascular endothelial growth factor (VEGF)-releasing fiber mat is developed for the transplantation of multilayered cardiomyocyte sheets. Poly(vinyl alcohol) fiber mats bearing poly(lactic-co-glycolic acid) nanoparticles that incorporate VEGF are fabricated using electrospinning and electrospray methods. Six-layered cardiomyocyte sheets are transplanted with a VEGF-releasing mat into athymic rats. After two weeks, these sheets produce thicker cardiomyocyte layers compared with controls lacking a VEGF-releasing mat, and incorporate larger-diameter blood vessels containing erythrocytes...
May 26, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28547184/combination-of-magnetic-dispersive-micro-solid-phase-extraction-and-supramolecular-solvent-based-microextraction-followed-by-high-performance-liquid-chromatography-for-determination-of-trace-amounts-of-cholesterol-lowering-drugs-in-complicated-matrices
#19
Somayeh Arghavani-Beydokhti, Maryam Rajabi, Alireza Asghari
A novel, efficient, rapid, simple, sensitive, selective, and environmentally friendly method termed magnetic dispersive micro solid-phase extraction combined with supramolecular solvent-based microextraction (Mdμ-SPE-SSME) followed by high-performance liquid chromatography (HPLC) with UV detection is introduced for the simultaneous microextraction of cholesterol-lowering drugs in complicated matrices. In the first microextraction procedure, using layered double hydroxide (LDH)-coated Fe3O4 magnetic nanoparticles, an efficient sample cleanup is simply and rapidly provided without the need for time-consuming centrifugation and elution steps...
May 26, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28546953/perspective-highlights-on-biodegradable-polymeric-nanosystems-for-targeted-therapy-of-solid-tumors
#20
REVIEW
Marziyeh Fathi, Jaleh Barar
Introduction: Polymeric nanoparticles (NPs) formulated using biodegradable polymers offer great potential for development of de novo drug delivery systems (DDSs) capable of delivering a wide range of bioactive agents. They can be engineered as advanced multifunctional nanosystems (NSs) for simultaneous imaging and therapy known as theranostics or diapeutics. Methods: A brief prospective is provided on biomedical importance and applications of biodegradable polymeric NSs through reviewing the recently published literature...
2017: BioImpacts: BI
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