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Xianghai Ji, Xiaoguang Yang, Tao Yang
We report the first self-catalyzed growth of high-quality GaSb nanowires on InAs stems using metal-organic chemical vapor deposition (MOCVD) on Si (111) substrates. To achieve the growth of vertical InAs/GaSb heterostructure nanowires, the two-step flow rates of the trimethylgallium (TMGa) and trimethylantimony (TMSb) are used. We first use relatively low TMGa and TMSb flow rates to preserve the Ga droplets on the thin InAs stems. Then, the flow rates of TMGa and TMSb are increased to enhance the axial growth rate...
December 2017: Nanoscale Research Letters
Xingxing Zhou, Shijing Guo, Jiaxi Gao, Jianmin Zhao, Shuyan Xue, Wenju Xu
Based on cascade catalysis amplification driven by glucose oxidase (GOx), a sensitive electrochemical impedimetric aptasensor for protein (carcinoembryonic antigen, CEA as tested model) was proposed by using Cu-based metal-organic frameworks functionalized with Pt nanoparticles, aptamer, hemin and GOx (Pt@CuMOFs-hGq-GOx). CEA aptamer loaded onto Pt@CuMOFs was bound with hemin to form hemin@G-quadruplex (hGq) with mimicking peroxidase activity. Through sandwich-type reaction of target CEA and CEA aptamers (Apt1 and Apt2), the obtained Pt@CuMOFs-hGq-GOx as signal transduction probes (STPs) was captured to the modified electrode interface...
June 20, 2017: Biosensors & Bioelectronics
Siriwan Nantaphol, Takeshi Watanabe, Naohiro Nomura, Weena Siangproh, Orawon Chailapakul, Yasuaki Einaga
The enormous demand for medical diagnostics has encouraged the fabrication of high- performance sensing platforms for the detection of glucose. Nonenzymatic glucose sensors are coming ever closer to being used in practical applications. Bimetallic catalysts have been shown to be superior to single metal catalysts in that they have greater activity and selectivity. Here, we demonstrate the preparation, characterization, and electrocatalytic characteristics of a new bimetallic Pt/Au nanocatalyst. This nanocatalyst can easily be synthesized by electrodeposition by sequentially depositing Au and Pt on the surface of a boron-doped diamond (BDD) electrode...
June 17, 2017: Biosensors & Bioelectronics
Ayomi Jayarathne, Prasanna Egodawatta, Godwin A Ayoko, Ashantha Goonetilleke
Detailed knowledge of the processes that metals undergo during dry weather periods whilst deposited on urban surfaces and their environmental significance is essential to predict the potential influence of metals on stormwater quality in order to develop appropriate stormwater pollution mitigation measures. However, very limited research has been undertaken in this area. Accordingly, this study investigated the geochemical phase and particle size relationships of seven metals which are commonly associated with urban road dust, using sequential extraction in order to assess their mobility characteristics...
June 24, 2017: Environmental Pollution
Olusola Olalekan Oladipo, Joseph Olusegun Ayo, Suleiman Folorunsho Ambali, Bisalla Mohammed, Tanang Aluwong
Lead (Pb), cadmium (Cd) and manganese (Mn) have many potential adverse health effects in vitro and in animal models of clinical toxicity. The current study investigated the dyslipidaemic and oxidative stress effects of chronic low-dose oral exposure to Pb, Cd and Mn and the combination (Pb+Cd+Mn) in rats for 15 weeks. Chronic exposure to the metals did not significantly (P>0.05) alter serum lipid profiles. However, the atherogenic index decreased by 32.2% in the Pb+Cd+Mn group, relative to the control. The triglyceride/high-density lipoprotein cholesterol ratio decreased by 39...
June 22, 2017: Environmental Toxicology and Pharmacology
Danielle Regina Gomes Ribeiro, Henrique Faccin, Thaís Ramos Dal Molin, Leandro Machado de Carvalho, Lílian Lund Amado
Concentrations of As, Cd, Cu, Cr, Pb, Hg, and Ni were analyzed during rainy and dry seasons in water, sediment, soil, and two fish species. The analysis took place at four points in the Xingu River, one point in the Fresco River, and two mining pits in the southeastern area of the Eastern Amazon, Brazil. In the water, the total concentration of As (>0.14μg/L) was higher than the local reference values at all sampling points and in both seasons. Ordination analysis (PCA) highlighted As and Cu elements in the water...
June 24, 2017: Science of the Total Environment
Yi-Tze Chen, Ying Wang, Kuo-Chen Yeh
Plants acquire mineral nutrients mostly through the rhizosphere; they secrete a large number of metabolites into the rhizosphere to regulate nutrient availability and to detoxify undesirable metal pollutants in soils. The secreted metabolites are inorganic ions, gaseous molecules, and mainly carbon-based compounds. This review focuses on the mechanisms and regulation of low-molecular-weight organic-compound exudation in terms of metal acquisition. We summarize findings on riboflavin/phenolic-facilitated and phytosiderophore-facilitated iron acquisition and discuss recent studies of the functions and secretion mechanisms of low-molecular-weight organic acids in heavy-metal detoxification...
June 24, 2017: Current Opinion in Plant Biology
Hui-Gang Wang, Mei Zhang, Min Guo
One-step solid state reaction method was proposed for the first time to realize the transformation of the Zn-containing EAFD from hazardous solid waste to multi-metal doped ferrite with enhanced magnetic property. The effect of Zn-containing EAFD to NiCl2·6H2O mass ratio (RZE/N, g·g(-1)) on the phases transformation was investigated by X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Raman spectroscopy. The as-synthesized samples were treated by toxicity characteristic leaching procedure (TCLP)...
June 20, 2017: Journal of Hazardous Materials
Osama Chahrour, John Malone, Mark Collins, Vrushali Salmon, Catherine Greenan, Amy Bombardier, Zhongze Ma, Nick Dunwoody
The new guidelines of the United States pharmacopeia (USP), European pharmacopeia (EP) and international conference on harmonization (ICH) regulating elemental impurities limits in pharmaceuticals signify the end of unspecific analysis of metals as outlined in USP 〈231〉. The new guidelines specify both daily doses and concentration/limits of elemental impurities in pharmaceutical final products, active pharmaceutical ingredients (API) and excipients. In chapter USP 〈233〉 method implementation, validation and quality control during the analytical process are described...
June 20, 2017: Journal of Pharmaceutical and Biomedical Analysis
Mohammed Alasel, Michael Keusgen
A new sensitive and selective platform, three-dimensional immunosensor, has been developed for a rapid serological diagnosis; detection of a Borrelia infection was considered as a model assay. The immunosensor is based on a 3-dimensional (3D) porous solid surface (sinter body) with dimensions of 2×2.5mm where a recombinant variable lipoprotein surface-exposed protein (VlsE; Borrelia-antigen) is immobilized by different techniques. The sinter body served as a robust and inexpensive carrier, which facilitated a successful hydrophobic adsorption as well as covalent immobilization of the antigen with sufficient amounts of on the surface...
June 20, 2017: Journal of Pharmaceutical and Biomedical Analysis
Alberto Villa, Neeraj Gupta, Oleksiy Khavryuchenko, Dangsheng Su
Nitrogen rich carbon nanotubes have been used as a metal free catalyst for the conversion of glycerol into dihydroxyacetone using tert-Butyl hydroperoxide (TBHP) as an oxidant. Pyridine nitrogen embedded in carbon matrix is identified as an active site for the reaction. Computational studies have demonstrated that oxidation of pyridine site to pyridine oxime followed by hydrogen abstraction from secondary alcohol is most probably responsible for the oxidation process.
June 27, 2017: ChemSusChem
Hanbit Park, D Amaranatha Reddy, Yujin Kim, Seunghee Lee, Rory Ma, Tae Kyu Kim
It is imperative to suppress the recombination rate of photogenerated carriers for the improvement of semiconductor-catalyzed solar-driven hydrogen production. To that end, photocatalysts comprising active sunlight-harvesting photoabsorbers and stable metal co-catalysts have attracted significant attention. However, the size, clean surface, and highly dispersed nature of the metal co-catalysts are crucial factors affecting the catalyst performance and reaction rate. Nevertheless, most of the available metal nanocrystals have been synthesized using complex procedures and harmful organic templates and stabilizers, affording high-purity compounds with difficulty and high cost...
June 27, 2017: Chemistry: a European Journal
Benjamin Ulfenborg, Alexander Karlsson, Maria Riveiro, Caroline Améen, Karolina Åkesson, Christian X Andersson, Peter Sartipy, Jane Synnergren
The development of high-throughput biomolecular technologies has resulted in generation of vast omics data at an unprecedented rate. This is transforming biomedical research into a big data discipline, where the main challenges relate to the analysis and interpretation of data into new biological knowledge. The aim of this study was to develop a framework for biomedical big data analytics, and apply it for analyzing transcriptomics time series data from early differentiation of human pluripotent stem cells towards the mesoderm and cardiac lineages...
2017: PloS One
Masahiro Hatazawa, Naoko Yoshie, Hidetake Seino
[Fe]-hydrogenase is a key enzyme involved in methanogenesis and facilitates reversible hydride transfer from H2 to N(5),N(10)-methenyltetrahydromethanopterin (CH-H4MPT(+)). In this study, a reaction system was developed to model the enzymatic function of [Fe]-hydrogenase by using N,N'-diphenylimidazolinium cation (1(+)) as a structurally related alternative to CH-H4MPT(+). In connection with the enzymatic mechanism via heterolytic cleavage of H2 at the single metal active site, several transition metal complex catalysts capable of such activation were utilized in the model system...
June 27, 2017: Inorganic Chemistry
Debiprasad Mondal, Sourav Biswas, Animesh Paul, Sujoy Baitalik
A conjugated bis-terpyridine bridging ligand, 2-(4-(2,6-di(pyridin-2-yl)pyridin-4-yl)phenyl)-6-(2-(4-(2,6-di(pyridin-2-yl)pyridin-4-yl)phenyl)-1H-benzo[d]imidazol-6-yl)-1H-benzo[d] imidazole (tpy-BPhBzimH2-tpy), was designed in this work by covalent coupling of 3,3'-diaminobenzidine and two 4'-(p-formylphenyl)-2,2':6',2″-terpyridine units to synthesize a new series of bimetallic Ru(II)-terpyridine light-harvesting complexes. Photophysical and electrochemical properties were modulated by the variation of the terminal ligands in the complexes...
June 27, 2017: Inorganic Chemistry
Sasitha C Abeyweera, Kowsalya D Rasamani, Yugang Sun
Nanocrystalline silver halides (AgX) such as AgCl, AgBr, and AgI, a class of semiconductor materials with characteristics of both direct and indirect band gaps, represent the most crucial components in traditional photographic processing. The nanocrystal surfaces provide sensitivity specks that can turn into metallic silver, forming an invisible latent image, upon exposure to light. The photographic processing implies that the AgX nanoparticles possess unique properties. First, pristine AgX nanoparticles absorb light only at low efficiency to convert surface AgX into tiny clusters of silver atoms...
June 27, 2017: Accounts of Chemical Research
Botao Ji, Yossef E Panfil, Uri Banin
For visible range emitting particles which are relevant for display and additional applications, Cd-chalcogenide nanocrystals have reached the highest degree of control and performance. Considering potential toxicity and regulatory limitations, there is a challenge to successfully develop Cd-free emitting nanocrystals and in particular, heterostructures with desirable properties. Herein, we report a colloidal synthesis of fluorescent heavy-metal free Zn-chalcogenide semiconductor nanodumbbells (NDBs), in which ZnSe tips were selectively grown on the apexes of ZnTe rods as evidenced by a variety of methods...
June 27, 2017: ACS Nano
Fabian Schütt, Vasile Postica, Rainer Adelung, Oleg Lupan
Highly porous hybrid materials with unique high-performance properties have attracted great interest from the scientific community, especially in the field of gas-sensing applications. In this work, tetrapodal-ZnO (ZnO-T) networks were functionalized with carbon nanotubes (CNTs) to form a highly efficient hybrid sensing material (ZnO-T-CNT) for ultrasensitive, selective, and rapid detection of ammonia (NH3) vapor at room temperature. By functionalizing the ZnO-T networks with 2.0 wt % of CNTs by a simple dripping procedure, an increase of 1 order of magnitude in response (from about 37 to 330) was obtained...
June 27, 2017: ACS Applied Materials & Interfaces
Keisuke Wada, Chandana Sampath Kumara Ranasinghe, Ryo Kuriki, Akira Yamakata, Osamu Ishitani, Kazuhiko Maeda
Metal-complex/semiconductor hybrids have attracted attention as photocatalysts for visible-light CO2 reduction, and electron transfer from metal complex to semiconductor is critically important to improve the performance. Here rutile TiO2 nanoparticles having 5-10 nm in size were employed as modifiers to improve interfacial charge transfer between semiconducting carbon nitride nanosheets (NS-C3N4) and a supramolecular Ru(II)-Re(I) binuclear complex (RuRe). The RuRe/TiO2/NS-C3N4 hybrid was capable of photocatalyzing CO2 reduction into CO with high selectivity under visible light (λ > 400 nm), outperforming an analogue without TiO2 by a factor of 4, in terms of both CO formation rate and turnover number (TON)...
June 27, 2017: ACS Applied Materials & Interfaces
Sabine Baumgart, Axel R Schulz, Anette Peddinghaus, Silke Stanislawiak, Sarah Gillert, Heike Hirseland, Susanne Krauthäuser, Christian Dose, Henrik E Mei, Andreas Grützkau
Antibody conjugates applicable in both conventional flow and mass cytometry would offer interesting options for cross-platform comparison, as well as the enrichment of rare target cells by conventional flow cytometry (FC) sorting prior to deep phenotyping by mass cytometry (MC). Here, we introduce a simple method to generate dual fluorochrome/metal-labelled antibodies by consecutive orthogonal labelling. First we compared different fluorochrome-conjugated antibodies specific for CD4, such as FITC, Vio667, VioGreen or VioBlue for their compatibility with the conventional secondary MAXPAR(®) labelling protocol...
June 27, 2017: European Journal of Immunology
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