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https://www.readbyqxmd.com/read/27922088/analysis-of-four-toxic-metals-in-a-single-rice-seed-by-matrix-solid-phase-dispersion-inductively-coupled-plasma-mass-spectrometry
#1
Xiufen He, Lixia Chen, Xin Chen, Huamei Yu, Lixu Peng, Bingjun Han
Toxic metals in rice pose great risks to human health. Metal bioaccumulation in rice grains is a criterion of breeding. Rice breeding requires a sensitive method to determine metal content in single rice grains to assist the variety selection. In the present study, four toxic metals of arsenic (As), cadmium (Cd), chromium (Cr) and lead (Pb) in a single rice grain were determined by a simple and rapid method. The developed method is based on matrix solid phase dispersion using multi-wall carbon nanotubes (MWCNTs) as dispersing agent and analyzed by inductively coupled plasma mass spectrometry...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27920525/fabrication-and-characterization-of-drug-loaded-nano-hydroxyapatite-polyamide-66-scaffolds-modified-with-carbon-nanotubes-and-silk-fibroin
#2
Meng-Zhu Yao, Ming-Yi Huang-Fu, Hui-Na Liu, Xia-Rong Wang, Xiaoxia Sheng, Jian-Qing Gao
Nano-hydroxyapatite/polyamide 66 (nHA/PA66) porous scaffolds were fabricated by a phase inversion method. Carbon nanotubes (CNTs) and silk fibroin (SF) were used to modify the surface of the nHA/PA66 scaffolds by freeze-drying and cross-linking. Dexamethasone was absorbed to the CNTs to promote the osteogenic differentiation of bone mesenchymal stem cells (BMSCs). The cell viability of BMSCs was investigated by changing the concentration of the CNT dispersion, and the most biocompatible scaffold was selected...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27919823/nerve-growth-factor-carbon-nanotube-complex-exerts-prolonged-protective-effects-in-an-in-vitro-model-of-ischemic-stroke
#3
Parichehr Hassanzadeh, Elham Arbabi, Fatemeh Atyabi, Rassoul Dinarvand
AIMS: The therapeutic potential of nerve growth factor (NGF) against the neurological disorders may be negatively affected by its short half-life. Based on the superior properties of carbon nanotubes (CNTs) for controlled drug delivery, we aimed to prepare CNT-NGF complex and evaluate its effect in an in vitro model of ischemic stroke. MATERIALS AND METHODS: Multi-walled CNTs (MWCNTs)-NGF complex was prepared using amino-functionalized COOH-MWCNTs and characterized by Fourier transform infrared spectroscopy and transmission electron microscopy...
December 2, 2016: Life Sciences
https://www.readbyqxmd.com/read/27918493/boundary-layer-detection-at-cryogenic-conditions-using-temperature-sensitive-paint-coupled-with-a-carbon-nanotube-heating-layer
#4
Kyle Z Goodman, William E Lipford, Anthony Neal Watkins
Detection of flow transition on aircraft surfaces and models can be vital to the development of future vehicles and computational methods for evaluating vehicle concepts. In testing at ambient conditions, IR thermography is ideal for this measurement. However, for higher Reynolds number testing, cryogenic facilities are often used, in which IR thermography is difficult to employ. In these facilities, temperature sensitive paint is an alternative with a temperature step introduced to enhance the natural temperature change from transition...
December 3, 2016: Sensors
https://www.readbyqxmd.com/read/27918458/new-electrochemically-modified-carbon-paste-inclusion-%C3%AE-cyclodextrin-and-carbon-nanotubes-sensors-for-quantification-of-dorzolamide-hydrochloride
#5
Nawal Ahmad Alarfaj, Maha Farouk El-Tohamy
The present article introduces a new approach to fabricate carbon paste sensors, including carbon paste, modified carbon paste inclusion β-cyclodextrin, and carbon nanotubes for the quantification of dorzolamide hydrochloride (DRZ). This study is mainly based on the construction of three different carbon paste sensors by the incorporation of DRZ with phosphotungstic acid (PTA) to form dorzolamide-phosphotungstate (DRZ-PT) as an electroactive material in the presence of the solvent mediator ortho-nitrophenyloctyl ether (o-NPOE)...
December 2, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27917430/viable-synthesis-of-highly-compressible-ultra-light-graphene-carbon-nanotube-composite-aerogels-without-additional-reductant-and-their-applications-for-strain-sensitivity
#6
Liang Gao, Feng Wang, Wenwei Zhan, Yue Wang, Gang Sui, Xiaoping Yang
A facile synthesis of three-dimensional ultra-light (≈2.52 mg cm(-3)) graphene-poly(dopamine) modified carbon nanotube composite aerogels that needed no additional reducing agents during the forming process is reported herein. The composite aerogels exhibited highly repeatable compressibility and superior electrical conductivity, and thus will have an important application value in strain-sensitive functional devices.
December 5, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27917301/separation-of-bacteria-protozoa-and-carbon-nanotubes-by-density-gradient-centrifugation
#7
Monika Mortimer, Elijah J Petersen, Bruce A Buchholz, Patricia A Holden
Sustainable production and use of carbon nanotube (CNT)-enabled materials require efficient assessment of CNT environmental hazards, including the potential for CNT bioaccumulation and biomagnification in environmental receptors. Microbes, as abundant organisms responsible for nutrient cycling in soil and water, are important ecological receptors for studying the effects of CNTs. Quantification of CNT association with microbial cells requires efficient separation of CNT-associated cells from individually dispersed CNTs and CNT agglomerates...
2016: Nanomaterials
https://www.readbyqxmd.com/read/27917012/enhanced-photocatalytic-electrochemical-and-photoelectrochemical-properties-of-tio2-nanotubes-arrays-modified-with-cu-agcu-and-bi-nanoparticles-obtained-via-radiolytic-reduction
#8
Michał Nischk, Paweł Mazierski, Zhishun Wei, Katarzyna Siuzdak, Natalie Amoin Kouame, Ewa Kowalska, Hynd Remita, Adriana Zaleska-Medynska
TiO2 nanotubes arrays (NTs), obtained via electrochemical anodization of Ti foil, were modified with monometallic (Cu, Bi) and bimetallic (AgCu) nanoparticles. Different amounts of metals' precursors were deposited on the surface of NTs by the spin-coating technique, and the reduction of metals was performed via gamma radiolysis. Surface modification of titania was studied by EDS and XPS analysis. The results show that AgCu nanoparticles exist in a Agcore-Cushell form. Photocatalytic activity was examined under UV irradiation and phenol was used as a model pollutant of water...
November 30, 2016: Applied Surface Science
https://www.readbyqxmd.com/read/27916961/recent-progress-in-electrochemical-biosensors-for-glycoproteins
#9
REVIEW
Uichi Akiba, Jun-Ichi Anzai
This review provides an overview of recent progress in the development of electrochemical biosensors for glycoproteins. Electrochemical glycoprotein sensors are constructed by combining metal and carbon electrodes with glycoprotein-selective binding elements including antibodies, lectin, phenylboronic acid and molecularly imprinted polymers. A recent trend in the preparation of glycoprotein sensors is the successful use of nanomaterials such as graphene, carbon nanotube, and metal nanoparticles. These nanomaterials are extremely useful for improving the sensitivity of glycoprotein sensors...
December 1, 2016: Sensors
https://www.readbyqxmd.com/read/27916824/graphene-oxide-nanoribbons-induce-autophagic-vacuoles-in-neuroblastoma-cell-lines
#10
Emanuela Mari, Stefania Mardente, Emanuela Morgante, Marco Tafani, Emanuela Lococo, Flavia Fico, Federica Valentini, Alessandra Zicari
Since graphene nanoparticles are attracting increasing interest in relation to medical applications, it is important to understand their potential effects on humans. In the present study, we prepared graphene oxide (GO) nanoribbons by oxidative unzipping of single-wall carbon nanotubes (SWCNTs) and analyzed their toxicity in two human neuroblastoma cell lines. Neuroblastoma is the most common solid neoplasia in children. The hallmark of these tumors is the high number of different clinical variables, ranging from highly metastatic, rapid progression and resistance to therapy to spontaneous regression or change into benign ganglioneuromas...
November 29, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27914367/single-wall-carbon-nanotube-electrode-system-capable-of-quantitative-detection-of-cd4-t-cells
#11
Joonhyub Kim, Gayoung Park, Seoho Lee, Suk-Won Hwang, Namki Min, Kyung-Mi Lee
Development of CNT-based CD4(+) T cell imunosensors remains in its infancy due to the poor immobilization efficiency, lack of reproducibility, and difficulty in providing linear quantification. Here, we developed a fully-integrated single wall carbon nanotube (SWCNT)-based immunosensor capable of selective capture and linear quantification of CD4(+) T cells with greater dynamic range. By employing repeated two-step oxygen (O2) plasma treatment processes with 35 days of recovery periods, we achieved the enhanced functionalization of the CNT surface and the removal of the byproduct of spray-coated SWCNTs that hinders charge transfer and stable CD4(+) T cell sensing...
November 25, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27913240/activity-of-vancomycin-release-from-bioinspired-coatings-of-hydroxyapatite-or-tio2-nanotubes
#12
Daniela Ionita, Daniela Bajenaru-Georgescu, Georgeta Totea, Anca Mazare, Patrik Schmuki, Ioana Demetrescu
Herein we investigate the efficiency of various biomimetic coatings for localized drug delivery, using vancomycin as key therapeutic drug, which is a widely used antibiotic for the treatment of strong infections caused by positive Gram bacteria. We evaluate classical hydroxyapatite and biomimetic hydroxyapatite-collagen coatings obtained by electrochemical deposition as well as TiO2 nanotubes arrays obtained by electrochemical anodization. Surface morphology, compositional and structural data confirm the incorporation of vancomycin into the layers and drug release profiles for vancomycin evaluate their release ability...
November 29, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/27911926/international-collaboration-patterns-and-effecting-factors-of-emerging-technologies
#13
Xu Bai, Yun Liu
With the globalization of the world economy, international innovation collaboration has taken place all over the world. This study selects three emerging technologies (3D printing, big data and carbon nanotubes and graphene technology) among 20 countries as the research objects, using three patent-based indicators and network relationship analysis to reflect international collaboration patterns. Then we integrate empirical analyses to show effecting factors of international collaboration degrees by using panel data...
2016: PloS One
https://www.readbyqxmd.com/read/27911418/synthesis-and-characterization-of-fe-doped-aluminosilicate-nanotubes-with-enhanced-electron-conductive-properties
#14
Ehsan Shafia, Serena Esposito, Elnaz Bahadori, Marco Armandi, Maela Manzoli, Barbara Bonelli
The goal of the protocol is to synthesize Fe-doped aluminosilicate nanotubes of the imogolite type with the formula (OH)3Al2-xFexO3SiOH. Doping with Fe aims at lowering the band gap of imogolite, an insulator with the chemical formula (OH)3Al2O3SiOH, and at modifying its adsorption properties towards azo-dyes, an important class of organic pollutants of both wastewater and groundwater. Fe-doped nanotubes are obtained in two ways: by direct synthesis, where FeCl3 is added to an aqueous mixture of the Si and Al precursors, and by post-synthesis loading, where preformed nanotubes are put in contact with a FeCl3•6H2O aqueous solution...
November 15, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27910984/enzyme-immobilized-clay-nanotube-chitosan-membranes-with-sustainable-biocatalytic-activities
#15
Jiajia Sun, Raghuvara Yendluri, Kai Liu, Ying Guo, Yuri Lvov, Xuehai Yan
We have developed a simple and effective strategy to prepare an enzymatic membrane by the admixing of a halloysite clay nanotube-lipase complex and a chitosan solution. The loading of 3 wt% lipase into the lumen of halloysite clay nanotubes was enhanced with an electrostatic interaction. 10 wt% of lipase-nanotubes were dispersed in an aqueous chitosan solution and cast as a coating. The enzymatic chitosan-halloysite membranes displayed increased pH, temperature stability and long-term usability for the catalytic decomposition of lipids: 90% of the initial activity was preserved at 80 °C, 70% of the functionality remained at the high pH of 9, and 85% of the activity was sustained after ten continuous cycles of use...
December 2, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27910250/a-large-%C3%AF-extended-carbon-nanoring-based-on-nanographene-units-bottom-up-synthesis-photophysical-properties-and-selective-complexation-with-fullerene-c70
#16
Dapeng Lu, Guilin Zhuang, Haotian Wu, Song Wang, Shangfeng Yang, Pingwu Du
Herein we report the organoplatinum-mediated bottom-up synthesis, characterization, and properties of a novel large π-extended carbon nanoring based on a nanographene hexa-peri-hexabenzocoronene (HBC) building unit. This tubular structure can be considered as an example of the longitudinal extension of the cycloparaphenylene scaffold to form a large π-extended carbon nanotube (CNT) segment. The cyclic tetramer of a tetramesityl HBC ([4]CHBC) was synthesized by the reaction of a 2,11-diborylated hexa-peri-hexabenzocoronene with a platinum complex, followed by reductive elimination...
December 2, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27907860/co-delivery-of-vp-16-and-bcl-2-targeted-antisense-on-peg-grafted-omwcnts-for-synergistic-in-vitro-anti-cancer-effects-in-non-small-and-small-cell-lung-cancer
#17
Zbynek Heger, Hana Polanska, Sona Krizkova, Jan Balvan, Martina Raudenska, Simona Dostalova, Amitava Moulick, Michal Masarik, Vojtech Adam
Present study describes the preparation of a polyethylene glycol-grafted oxidized multi-walled carbon nanotubes (oMWCNTs-PEG) hybrid nanosystem as a carrier of etoposide (VP-16) and Bcl-2 phosphorothioate antisense deoxyoligonucleotides (Aso) to achieve a superior cytostastic efficacy in non-small and small cell lung cancer in vitro. We have demonstrated that the adsorption of hydrophobic VP-16 and Bcl-2 Aso results in a stable nanotransporter exhibiting good dispersion with excellent release profiles (both, in pH 7...
November 19, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27906390/flexible-all-solid-state-supercapacitors-based-on-polyaniline-orderly-nanotubes-array
#18
Huihua Li, Juan Song, Linlin Wang, Xiaomiao Feng, Ruiqing Liu, Wenjin Zeng, Zhendong Huang, Yanwen Ma, Lianhui Wang
Flexible all-solid-state supercapacitors are crucial to meet the growing needs for portable electronic devices such as foldable phones and wearable electronics. As promising candidates for pseudocapacitor electrode materials, polyaniline (PANI) orderly nanotube arrays are prepared via a simple template electrodeposition method. The structures of the final product were characterized using various characterization techniques, including scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS)...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27906140/management-of-citrus-waste-by-switching-in-the-production-of-nanocellulose
#19
Sania Naz, Naveed Ahmad, Javeed Akhtar, Nasir Mehmood Ahmad, Attarad Ali, Muhammad Zia
Citrus fruit processing industries produce a vast quantity of waste materials as peel and pulp that are not handled properly. In present study, waste generated from citrus has been used for extraction of cellulose and nanocellulose. The aggregated cellulose, derived after alkaline treatment, was acid hydrolysed; resulted in reduction of the size of cellulose fibre. The cellulose showed amorphous structure revealed by X-ray diffraction analysis. Scanning electron microscopy analysis explained densely packed structure of nanocellulose...
December 2016: IET Nanobiotechnology
https://www.readbyqxmd.com/read/27906137/in-vitro-toxicity-of-carbon-nanotube-polylysine-colloids-to-colon-cancer-cells
#20
Alejandro Ansón-Casaos, Laura Grasa, Desirée Pereboom, José Emilio Mesonero, Alvaro Casanova, María Divina Murillo, María Teresa Martínez
Single-walled carbon nanotubes (SWCNTs) are thoroughly purified and dispersed in an aqueous solution of high molecular weight poly-L-lysine (pLlys). Human intestinal epithelial Caco-2/TC7 cells are incubated with the SWCNT dispersions in pLlys, and their effects on cell viability are studied by image flow cytometry. No significant changes are observed in the cell culture wells up to pLlys concentrations of 10 μg ml(-1). However, high mortality is detected at pLlys concentrations of 100 μg ml(-1). The presence of oxygen-free SWCNTs does not modify the effects of pLlys on cell cultures at any of the tested concentrations (≤1 μg ml(-1))...
December 2016: IET Nanobiotechnology
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