82,937 results match your criteria Nanotechnology [Journal]


Growth dynamics of InAs/InP nanowire heterostructures by Au-assisted chemical beam epitaxy.

Nanotechnology 2018 Dec 11. Epub 2018 Dec 11.

NEST, Scuola Normale Superiore, Istituto Nanoscienze - CNR, 56126 Pisa, Pisa, I56127, ITALY.

The steady-state chemical composition of the In/Au alloy nanoparticles during isothermal growth of Au-assisted InAs and InP nanowires is different for the two materials. Therefore, when switching from one material to the other, to grow axial nanowire heterostructures, transient effects dominate during the time period of the nanoparticle reconfiguration. As a consequence, the precise control of the thickness of thin InP and InAs segments, which is fundamental for the realization of quantum dot structures and superlattices, can be very challenging. Read More

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December 2018

Coaxial-cable hierarchical tubular MnO2@Fe3O4@C heterostructures as advanced anode for lithium-ion batteries.

Nanotechnology 2018 Dec 11. Epub 2018 Dec 11.

Institute of Advanced Materials, Nanjing Tech University, Nanjing, CHINA.

Nanostructured manganese oxides have been regarded as promising anodes for lithium-ion batteries (LIBs) due to their high specific capacity, environmental friendliness and low cost. However, as conversion-type electrodes, their scalable utilization is hindered by intrinsically low reaction kinetics, large volume variation and high polarization. Herein, a coaxial-cable tubular heterostructures composed of hollow carbon skeleton, Fe3O4 nanoparticles and ultrathin MnO2 nanosheets from inside out, donated as MnO2@Fe3O4@C, is synthesized via facile two-step hydrothermal process. Read More

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December 2018

Synthesis and evaluation of HfO2 as a prospective filler in inorganic-organic hybrid membranes based on Nafion for PEM fuel cells.

Nanotechnology 2018 Dec 11. Epub 2018 Dec 11.

SCIENCE, Centro de Investigacion y Desarrollo Tecnologico en Electroquimica SC, Pedro Escobedo, 76703, MEXICO.

Hybrid inorganic-organic Nafion membranes modified with metal oxides (typically TiO<sub>2</sub>, ZrO<sub>2</sub>, WO<sub>3</sub>) are a good alternative for fuel cells applications. However, one of their main limitations is associated with their relative low proton conductivity at temperatures above 80°C. In this work, we overcome this issue using HfO<sub>2</sub> as a filler. Read More

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December 2018

Highly sensitive nitric oxide gas sensor based on ZnO-nanorods vertical resistor operated at room temperature.

Nanotechnology 2018 Dec 11. Epub 2018 Dec 11.

Department of Electronics Engineering, National Chiao-Tung University, 1001 Ta-Hsueh Road, Hsinchu 300, TAIWAN, Hsinchu, TAIWAN.

We successfully demonstrated a simple and low-cost nitric oxide (NO) gas sensor to deliver parts-per-billion (ppb) regime detection at room temperature operation. A vertical-channel ZnO nanorods resistor is fabricated by putting silver nanowire electrode onto the hydrothermal ZnO nanorods film. With suitable process condition, the nanorods film exhibits a uniform morphology to enable the formation of gas-permeable nanowire top electrode while also the nanorods provide good surface-to-volume ratio to deliver strong reaction with NO gas. Read More

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December 2018

Polymer spreading on substrates with nanoscale grooves using molecular dynamics.

Nanotechnology 2018 Dec 11. Epub 2018 Dec 11.

University of Utah, Salt Lake City, Utah, UNITED STATES.

Understanding how liquid polymer interacts with and spreads on surfaces with nanoscale texture features is crucial for designing complex nanoscale systems. We use molecular dynamics to simulate different types of polymer as they spread on substrates with a single nanoscale groove. We study how groove design affects the potential energy of a substrate and how this governs polymer spreading and orientation. Read More

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December 2018

Cu2O porous nanostructured films fabricated by positive bias sputtering deposition.

Nanotechnology 2018 Dec 11. Epub 2018 Dec 11.

Changzhou University, Changzhou, 213164, CHINA.

In this work, the authors fabricated Cu2O porous nanostructured films (PNFs) on glass slide substrates by the newly developed positive bias deposition approach in a balanced magnetron sputtering (MS) system. It was found that the surface morphology, crystal structure and optical property of the as-deposited products were greatly dependent on the applied positive substrate bias. In particular, when the substrate was biased at +50 V and +150 V, both of the as-prepared Cu2O PNFs exhibited a unique triangular pyramids-like structure with obvious edges and corners and little gluing, a preferred orientation of (111) and a blue shift of energy band gap at 2. Read More

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December 2018

Microfluidics for real-time direct monitoring of self- and co-assembly biomolecular processes.

Nanotechnology 2018 Dec 11. Epub 2018 Dec 11.

Department of Molecular Microbiology and Biotechnology, Tel Aviv University, Tel Aviv, ISRAEL.

Molecular self-assembly is a major approach for the fabrication of functional supramolecular nanomaterials. This dynamic, straightforward, bottom-up procedure may result in the formation of various architectures at the nano-scale, with remarkable physical and chemical characteristics. Biological and bio-inspired building blocks are especially attractive due to their intrinsic tendency to assemble into layered well-organized structures, as well as their inherent biocompatibility. Read More

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December 2018

Integration of sputter-deposited multiferroic CoFe2O4-BiFeO3 nanocomposites on conductive La0.7Sr0.3MnO3 electrodes.

Nanotechnology 2018 Dec 11. Epub 2018 Dec 11.

Myongji University - Natural Science Campus, Yongin, 449-728, Korea (the Republic of).

The structure, magnetic and ferroelectric properties of sputtered epitaxial CoFe2O4-BiFeO3 (CFO-BFO) nanocomposite thin films grown on La0.7Sr0.3MnO3 (LSMO) layers on (001) oriented SrTiO3 (STO) substrates and on STO-buffered Si are described. Read More

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December 2018

Piezoelectric barium titanate nanostimulators for the treatment of glioblastoma multiforme.

J Colloid Interface Sci 2018 Dec 4;538:449-461. Epub 2018 Dec 4.

Istituto Italiano di Tecnologia, Smart Bio-Interfaces, Viale Rinaldo Piaggio 34, 56025 Pontedera, Italy; Politecnico di Torino, Department of Mechanical and Aerospace Engineering, Corso Duca degli Abruzzi 24, 10129 Torino, Italy. Electronic address:

Major obstacles to the successful treatment of gliolastoma multiforme are mostly related to the acquired resistance to chemotherapy drugs and, after surgery, to the cancer recurrence in correspondence of residual microscopic foci. As innovative anticancer approach, low-intensity electric stimulation represents a physical treatment able to reduce multidrug resistance of cancer and to induce remarkable anti-proliferative effects by interfering with Ca and K homeostasis and by affecting the organization of the mitotic spindles. However, to preserve healthy cells, it is utterly important to direct the electric stimuli only to malignant cells. Read More

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December 2018

Graphene from discharged dry cell battery electrodes.

J Hazard Mater 2018 Dec 3;366:358-369. Epub 2018 Dec 3.

Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology, Nagpur, 440010, India. Electronic address:

Utilization of extracted graphite rods from discharged dry cell batteries for synthesis of graphene oxide / graphene serves two purposes, one is waste management which supports environmental safety and the second is low cost production of graphene oxide / graphene which are highly promising 2D materials in various fields of research. In the present work, a sustainable feasibility for the synthesis of graphene oxide / graphene from graphite rods of waste dry cell batteries is demonstrated. The graphite rods separated from the waste dry cell batteries were subjected to electrochemical exfoliation (ECE) in an acidic media. Read More

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December 2018

Targeting Peptide-Based Probes for Molecular Imaging and Diagnosis.

Adv Mater 2018 Dec 7:e1804827. Epub 2018 Dec 7.

CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, Beijing, 100190, P. R. China.

A series of novel peptide-based molecular probes for different biomarkers is highlighted herein. These probes can provide targeted recognition with high affinity, high specificity, high penetration, and rapid excretion ability. These sensitive peptides can achieve rapid and specific detection when they are conjugated with imaging moieties or are formed into nanoprobes, which can be adapted for in vivo molecular imaging in targeted diagnosis and therapy. Read More

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December 2018

There and back again - The journey of LiNiO₂ as cathode active material.

Angew Chem Int Ed Engl 2018 Dec 10. Epub 2018 Dec 10.

Universität Gießen, Heinrich-Buff-Ring 58, 35392, Gießen, GERMANY.

LiNiO₂ (LNO) has been introduced as cathode active material (CAM) for Li-ion batteries in 1990. After years of intensive research, it emerged that several instability issues plague the material, so that it was abandoned in favor of isostructural metal-substituted compounds called NCA (for lithium nickel cobalt aluminum oxide) and NCM (lithium nickel cobalt manganese oxide). These sacrifice a certain amount of specific energy in exchange for stability, durability and safety. Read More

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December 2018

Nanoplumbing with 2D Metamaterials.

Small 2018 Dec 11:e1803478. Epub 2018 Dec 11.

NC State University, Raleigh, NC, 27695-8202, USA.

Complex manipulations of DNA in a nanofluidic device require channels with branches and junctions. However, the dynamic response of DNA in such nanofluidic networks is relatively unexplored. Here, the transport of DNA in a 2D metamaterial made by arrays of nanochannel junctions is investigated. Read More

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December 2018

Chromatin dynamics governed by a set of nuclear structural proteins.

Genes Chromosomes Cancer 2018 Dec 9. Epub 2018 Dec 9.

Physics Department & Nanotechnology Institute, Bar Ilan University, Ramat Gan, Israel.

During the past three decades, the study of nuclear and chromatin organization has become of great interest. The organization and dynamics of chromatin are directly responsible for many functions including gene regulation, genome replication, and maintenance. In order to better understand the details of these mechanisms, we need to understand the role of specific proteins that take part in these processes. Read More

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December 2018

Curcumin in tissue engineering: A traditional remedy for modern medicine.

Biofactors 2018 Dec 8. Epub 2018 Dec 8.

Bioengineering Research Group, Nanotechnology and Advanced Materials Department, Materials and Energy Research Center (MERC), Tehran, Iran.

Curcumin is the principal polyphenolic compound present in turmeric with broad applications in tissue engineering and regenerative medicine. It has some important inherent properties with the potential to facilitate tissue healing, including anti-inflammatory, anti-oxidant, and antibacterial activities. Therefore, curcumin has been used for the treatment of various damaged tissues, especially wound injuries. Read More

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December 2018

Characterization of thin gelatin hydrogel membranes with balloon properties for dynamic tissue engineering.

Biopolymers 2018 Dec 8:e23241. Epub 2018 Dec 8.

Department of Micro- and Nanotechnology, The Danish National Research Foundation and Villum Foundation's Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Technical University of Denmark, Kongens Lyngby, Denmark.

Cell or tissue stretching and strain are present in any in vivo environment, but is difficult to reproduce in vitro. Here, we describe a simple method for casting a thin (about 500 μm) and soft (about 0.3 kPa) hydrogel of gelatin and a method for characterizing the mechanical properties of the hydrogel simply by changing pressure with a water column. Read More

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December 2018
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An Oxygen-Vacancy-Rich Semiconductor-Supported Bifunctional Catalyst for Efficient and Stable Zinc-Air Batteries.

Adv Mater 2018 Dec 9:e1806761. Epub 2018 Dec 9.

Department of Chemical Engineering, Waterloo Institute for Nanotechnology, Waterloo Institute for Sustainable Energy, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada.

The highly oxidative operating conditions of rechargeable zinc-air batteries causes significant carbon-support corrosion of bifunctional oxygen electrocatalysts. Here, a new strategy for the catalyst support design focusing on oxygen vacancy (OV)-rich, low-bandgap semiconductor is proposed. The OVs promote the electrical conductivity of the oxide support, and at the same time offer a strong metal-support interaction (SMSI), which enables the catalysts to have small metal size, high catalytic activity, and high stability. Read More

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December 2018

Promoting Electrocatalysis upon Aerogels.

Adv Mater 2018 Dec 9:e1804881. Epub 2018 Dec 9.

Physikalische Chemie, Technische Universität Dresden, Bergstraße 66b, 01062, Dresden, Germany.

Electrocatalysis plays a prominent role in renewable energy conversion and storage, enabling a number of sustainable processes for future technologies. There are generally three strategies to improve the efficiency (or activity) of the electrocatalysts: i) increasing the intrinsic activity of the catalyst itself, ii) improving the exposure of active sites, and iii) accelerating mass transfer during catalysis (both reactants and products). These strategies are not mutually exclusive and can ideally be addressed simultaneously, leading to the largest improvements in activity. Read More

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December 2018

Recent Progress in Electrically Rechargeable Zinc-Air Batteries.

Adv Mater 2018 Dec 9:e1805230. Epub 2018 Dec 9.

Department of Chemical Engineering, Waterloo Institute for Nanotechnology, Waterloo Institute for Sustainable Energy, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada.

Over the past decade, the surging interest for higher-energy-density, cheaper, and safer battery technology has spurred tremendous research efforts in the development of improved rechargeable zinc-air batteries. Current zinc-air batteries suffer from poor energy efficiency and cycle life, owing mainly to the poor rechargeability of zinc and air electrodes. To achieve high utilization and cyclability in the zinc anode, construction of conductive porous framework through elegant optimization strategies and adaptation of alternate active material are employed. Read More

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December 2018

The role of microRNAs in embryonic stem cell and induced pluripotent stem cell differentiation in male germ cells.

J Cell Physiol 2018 Dec 10. Epub 2018 Dec 10.

Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.

New perspectives have been opened by advances in stem cell research for reproductive and regenerative medicine. Several different cell types can be differentiated from stem cells (SCs) under suitable in vitro and in vivo conditions. The differentiation of SCs into male germ cells has been reported by many groups. Read More

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December 2018

Specific Systems for Imaging.

Exp Suppl 2018 ;110:69-97

University of Waterloo, Waterloo, ON, Canada.

Microscopy allows for the characterization of small objects invisible to the naked eye, a technique that, since its conception, has played a key role in the development across nearly every field of science and technology. Given the nanometer size of the materials explored in the field of nanotechnology, the contributions of modern microscopes that can visualize these materials are indispensable, and the ever-improving technology is paramount to the future success of the field. This chapter will focus on four fundamental areas of microscopy used in the field of nanotechnology including fluorescence microscopy (Sect. Read More

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January 2018

Preparation of Hollow Polyaniline Micro/Nanospheres and Their Removal Capacity of Cr (VI) from Wastewater.

Nanoscale Res Lett 2018 Dec 7;13(1):401. Epub 2018 Dec 7.

Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, P. O. Box 1129, Hefei, 230031, People's Republic of China.

The hollow polyaniline (PANI) micro/nanospheres are obtained through a simple monomer polymerization in alkaline solution with Triton X-100 Micelles as soft templates. The hollow PANI micro/nanospheres demonstrate rapid and effective removal ability for Chromium (VI) (Cr (VI)) in a wide pH range, and the maximum removal capacity can reach 127.88 mg/g at pH 3. Read More

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December 2018

Synthesis of graphene by in situ catalytic chemical vapor deposition of reed as a carbon source for VOC adsorption.

Environ Sci Pollut Res Int 2018 Dec 8. Epub 2018 Dec 8.

Department of Basic Sciences, Islamic Azad University, Science and Research Branch, Tehran, 14778-93855, Iran.

Few-layer graphene was synthesized by in situ catalytic carbon vapor deposition (CCVD) method, using reed as a carbon source and Ni, Cu, and Mg salts as the catalyst compounds. The synthesized graphene was also used for adsorption of VOCs. Furthermore, the effect of organic additives, sorbitol, and citric acid on catalyst compounds was investigated by temperature-programmed reduction analysis (H-TPR). Read More

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December 2018

Tropomyosin Tpm 2.1 loss induces glioblastoma spreading in soft brain-like environments.

J Neurooncol 2018 Dec 9. Epub 2018 Dec 9.

Children's Cancer Research Unit, Kids Research Institute, The Children's Hospital at Westmead, Locked Bag 4001, Westmead, NSW, 2145, Australia.

Introduction: The brain is a very soft tissue. Glioblastoma (GBM) brain tumours are highly infiltrative into the surrounding healthy brain tissue and invasion mechanisms that have been defined using rigid substrates therefore may not apply to GBM dissemination. GBMs characteristically lose expression of the high molecular weight tropomyosins, a class of actin-associating proteins and essential regulators of the actin stress fibres and focal adhesions that underpin cell migration on rigid substrates. Read More

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December 2018

Insights on protein thermal stability: a graph representation of molecular interactions.

Bioinformatics 2018 Dec 10. Epub 2018 Dec 10.

Department of Physics, Sapienza University of Rome, Rome, Italy.

Motivation: Understanding the molecular mechanisms of thermal stability is a challenge in protein biology. Indeed, knowing the temperature at which proteins are stable has important theoretical implications, which are intimately linked with properties of the native fold, and a wide range of potential applications from drug design to the optimization of enzyme activity.

Results: Here, we present a novel graph-theoretical framework to assess thermal stability based on the structure without any a priori information. Read More

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December 2018

Nanomaterials with enzyme-like characteristics (nanozymes): next-generation artificial enzymes (II).

Chem Soc Rev 2018 Dec 11. Epub 2018 Dec 11.

Department of Biomedical Engineering, College of Engineering and Applied Sciences, Nanjing National Laboratory of Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing University, Nanjing, China. and State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, China and State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, China.

Nanozymes are nanomaterials with enzyme-like characteristics (Chem. Soc. Rev. Read More

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December 2018

Correction: Controlled p-type substitutional doping in large-area monolayer WSe crystals grown by chemical vapor deposition.

Nanoscale 2018 Dec 11. Epub 2018 Dec 11.

Department of Electrical and Computer Engineering, University of Minnesota, 200 Union Street, Minneapolis, Minnesota 55455, USA.

Correction for 'Controlled p-type substitutional doping in large-area monolayer WSe2 crystals grown by chemical vapor deposition' by Stephen A. Campbell et al., Nanoscale, 2018, 10, 21374-21385. Read More

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December 2018

Photochromic control of a plasmon-quantum dots coupled system.

Nanoscale 2018 Dec 10. Epub 2018 Dec 10.

Lumière, nanomatériaux et nanotechnologies (L2n), Institut Charles Delaunay, CNRS, Université de Technologie de Troyes, 12 rue Marie Curie, CS 42060, 10004 Troyes Cedex, France.

The control of quantum dot (QD) photoluminescence (PL) is a challenge for many applications. It is well known that plasmonic resonances can enhance this PL. In this work, we couple QDs with silver nanoparticles and immerse the system in a photochromic organic material. Read More

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December 2018

Ultrahigh-efficiency aqueous flat nanocrystals of CdSe/CdS@CdZnS colloidal core/crown@alloyed-shell quantum wells.

Nanoscale 2018 Dec 10. Epub 2018 Dec 10.

LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798. and School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 639798 and Department of Electrical and Electronics Engineering and Department of Physics, UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Bilkent, Ankara, Turkey 06800.

Colloidal semiconductor nanoplatelets (NPLs) are highly promising luminescent materials owing to their exceptionally narrow emission spectra. While high-efficiency NPLs in non-polar organic media can be obtained readily, NPLs in aqueous media suffer from extremely low quantum yields (QYs), which completely undermines their potential, especially in biological applications. Here, we show high-efficiency water-soluble CdSe/CdS@Cd1-xZnxS core/crown@shell NPLs formed by layer-by-layer grown and composition-tuned gradient Cd1-xZnxS shells on CdSe/CdS core/crown seeds. Read More

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December 2018

Multi-electron reduction of Wells-Dawson polyoxometalate films onto metallic, semiconducting and dielectric substrates.

Phys Chem Chem Phys 2018 Dec 10. Epub 2018 Dec 10.

Institute of Nanoscience and Nanotechnology (INN), National Center for Scientific Research (NCSR) "Demokritos", 15341 Agia Paraskevi, Attica, Greece.

The investigation of conditions allowing multi-electron reduction and reoxidation of polyoxometalate (POM) films onto solid substrates is considered an issue of critical importance for their successful incorporation in electronic devices, different types of sensors and catalytic systems. In the present paper, the rich multi-electron redox chemistry of films of Wells-Dawson ammonium salts, namely (NH4)6P2Mo18O62 and (NH4)6P2W18O62, on top of metallic (Al), semiconducting (ITO) and dielectric (SiO2) substrates under ambient conditions is investigated. The respective Keggin heteropolyacids, H3PMo12O40 and H3PW12O40, are also investigated for comparison. Read More

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December 2018

Challenges and Opportunities of Nanotechnology as Delivery Platform for Tocotrienols in Cancer Therapy.

Front Pharmacol 2018 26;9:1358. Epub 2018 Nov 26.

Product Development and Advisory Services Division, Malaysian Palm Oil Board, Bandar Baru Bangi, Malaysia.

Plant-derived phytonutrients have emerged as health enhancers. Tocotrienols from the vitamin E family gained high attention in recent years due to their multi-targeted biological properties, including lipid-lowering, neuroprotection, anti-inflammatory, antioxidant, and anticancer effects. Despite well-defined mechanism of action as an anti-cancer agent, their clinical use is hampered by poor pharmacokinetic profile and low oral bioavailability. Read More

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November 2018

An Integrated Cytoskeletal Model of Neurite Outgrowth.

Front Cell Neurosci 2018 26;12:447. Epub 2018 Nov 26.

Department of Biological Sciences, Purdue University, West Lafayette, IN, United States.

Neurite outgrowth underlies the wiring of the nervous system during development and regeneration. Despite a significant body of research, the underlying cytoskeletal mechanics of growth and guidance are not fully understood, and the relative contributions of individual cytoskeletal processes to neurite growth are controversial. Here, we review the structural organization and biophysical properties of neurons to make a semi-quantitative comparison of the relative contributions of different processes to neurite growth. Read More

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November 2018

Complete Genome Sequences of Four Staphylococcus aureus Sequence Type 398 Isolates from Four Goats with Osteomyelitis.

Microbiol Resour Announc 2018 Sep 27;7(12). Epub 2018 Sep 27.

Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee, USA.

Staphylococcus aureus is the causative agent of multiple infections, including bacteremia, infective endocarditis, osteomyelitis, septic arthritis, and prosthetic device infections. We report here the first whole-genome sequence for four S. aureus sequence type 398 isolates from clinical cases of osteomyelitis in four goats with a history of orthopedic surgery. Read More

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September 2018

Data on preparation and characterization of an insect odorant receptor based biosensor.

Data Brief 2018 Dec 7;21:2142-2148. Epub 2018 Nov 7.

Polymer Electronic Research Centre, School of Chemical Sciences, University of Auckland, Auckland 1023, New Zealand.

Insect Odorant receptors (OrXs) can be used as the recognition element in a biosensor as they demonstrate high levels of sensitivity and selectivity towards volatile organic compounds. Herein, we describe a method to express and purify insect odorant receptors and reconstitute them into artificial lipid bilayers (liposomes). These OrX/liposomes were covalently attached to a gold surface and characterized using quartz crystal microbalance with dissipation monitoring (QCM-D). Read More

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December 2018

Porous Silicon Bragg Reflector/Carbon Dot Hybrids: Synthesis, Nanostructure, and Optical Properties.

Front Chem 2018 23;6:574. Epub 2018 Nov 23.

Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa, Israel.

Carbon dots (C-dots) exhibit unique fluorescence properties, mostly depending upon their physical environments. Here we investigate the optical properties and nanostructure of Carbon dots (C-dots) which are synthesized within different porous Silicon (PSi) Bragg reflectors. The resulting hybrids were characterized by photoluminescence, X-ray photoelectron, and Fourier Transform Infrared spectroscopies, as well as by confocal and transmission electron microscopy. Read More

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November 2018

Microvasculature-on-a-chip for the long-term study of endothelial barrier dysfunction and microvascular obstruction in disease.

Nat Biomed Eng 2018 23;2:453-463. Epub 2018 Apr 23.

Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, USA.

Alterations in the mechanical properties of erythrocytes occurring in inflammatory and hematologic disorders such as sickle cell disease (SCD) and malaria often lead to increased endothelial permeability, haemolysis, and microvascular obstruction. However, the associations among these pathological phenomena remain unknown. Here, we report a perfusable, endothelialized microvasculature-on-a-chip featuring an interpenetrating-polymer-network hydrogel that recapitulates the stiffness of blood-vessel intima, basement membrane self-deposition and self-healing endothelial barrier function for longer than 1 month. Read More

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April 2018
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STAT3-siRNA induced B16.F10 melanoma cell death: more association with VEGF downregulation than p-STAT3 knockdown.

Authors:
Aws Alshamsan

Saudi Pharm J 2018 Dec 30;26(8):1083-1088. Epub 2018 May 30.

Nanomedicine Research Unit, Department of Pharmaceutics, College of Pharmacy, King Saud University, Saudi Arabia.

STAT3 knockdown by small interfering RNA (siRNA) has been described to inhibit carcinogenic growth in various types of tumors. Earlier we have reported delivery of siRNA by oleic acid- and stearic acid-modified-polyethylenimine and enhancement of silencing of STAT3 by small interfering RNA (siRNA) in B16.F10 melanoma cell lines and consequent tumor suppression. Read More

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December 2018

Reverse micelle-lipid nanocapsules: a novel strategy for drug delivery of the plectasin derivate AP138 antimicrobial peptide.

Int J Nanomedicine 2018 15;13:7565-7574. Epub 2018 Nov 15.

Micro & Nanomédecines Translationelles-MINT, UNIV Angers, INSERM U1066, CNRS UMR 6021, UBL Universite Bretagne Loire, Angers, France.

Introduction: Resistance to traditional antibiotics is an increasingly serious problem. Antimicrobial peptides (AMPs) have emerged as a new therapeutic class with great potential against infectious diseases, as they are less prone to induce resistance. Nanotechnology-based delivery strategies can improve the efficiency and stability of AMPs, particularly against proteolytic degradation. Read More

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November 2018

Supplementation of whole grain flaxseeds () along with high cholesterol diet and its effect on hyperlipidemia and initiated atherosclerosis in Wistar albino male rats.

Vet World 2018 Nov 17;11(10):1433-1439. Epub 2018 Oct 17.

Department of Nanotechnology, Frontier Institute of Technology, RARS, Tirupati, Andhra Pradesh, India.

Background And Aim: Flaxseeds are known to have varying antihypercholesterolemic and antiatherogenic activity due to its lignan secoisolariciresinol diglucoside, alpha-linolenic acid, and omega-3 fatty acids. The beneficial effect of whole grain dietary flaxseed was evaluated experimentally in high cholesterol diet (HCD)-fed Wistar albino rats.

Materials And Methods: Male Wistar albino rats (200 g) were divided into four groups of 12 rats each. Read More

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November 2018

antibacterial effects of zinc oxide nanoparticles on multiple drug-resistant strains of and : An alternative approach for antibacterial therapy of mastitis in sheep.

Vet World 2018 Nov 16;11(10):1428-1432. Epub 2018 Oct 16.

Department of Veterinary Clinical Sciences, Faculty of Veterinary Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan.

Aim: The aim of the study was to evaluate the antibacterial effects of zinc oxide nanoparticles (ZnO-NPs) and its possible alternative use for the treatment for mastitis in sheep and to determine the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of ZnO-NPs against multidrug-resistant and strains isolated from subclinical mastitis cases in sheep.

Materials And Methods: A total of 50 pooled milk samples were collected from ewes with subclinical mastitis. Milk samples were cultured using standard laboratory techniques, and multidrug-resistant bacterial strains were determined using the Kirby-Bauer disk diffusion method. Read More

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November 2018

Creation of equal-spin triplet superconductivity at the Al/EuS interface.

Nat Commun 2018 Dec 7;9(1):5248. Epub 2018 Dec 7.

Department of Physics, University of Konstanz, Universitätsstraße 10, D-78457, Konstanz, Germany.

In conventional superconductors, electrons of opposite spins are bound into Cooper pairs. However, when the superconductor is in contact with a non-uniformly ordered ferromagnet, an exotic type of superconductivity can appear at the interface, with electrons bound into three possible spin-triplet states. Triplet pairs with equal spin play a vital role in low-dissipation spintronics. Read More

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December 2018

Revealing molecular-level surface redox sites of controllably oxidized black phosphorus nanosheets.

Nat Mater 2018 Dec 10. Epub 2018 Dec 10.

School of Chemical Engineering, College of Engineering, Sungkyunkwan University, Suwon, Republic of Korea.

Bulk and two-dimensional black phosphorus are considered to be promising battery materials due to their high theoretical capacities of 2,600 mAh g. However, their rate and cycling capabilities are limited by the intrinsic (de-)alloying mechanism. Here, we demonstrate a unique surface redox molecular-level mechanism of P sites on oxidized black phosphorus nanosheets that are strongly coupled with graphene via strong interlayer bonding. Read More

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December 2018

Space- and time-resolved investigation on diffusion kinetics of human skin following macromolecule delivery by microneedle arrays.

Sci Rep 2018 Dec 10;8(1):17759. Epub 2018 Dec 10.

Australian National University, Canberra, ACT, 0200, Australia.

Microscale medical devices are being developed for targeted skin delivery of vaccines and the extraction of biomarkers, with the potential to revolutionise healthcare in both developing and developed countries. The effective clinical development of these devices is dependent on understanding the macro-molecular diffusion properties of skin. We hypothesised that diffusion varied according to specific skin layers. Read More

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December 2018

First comparative results about the direct effect of traditional cigarette and e-cigarette smoking on lung alveolocapillary membrane using dynamic ventilation scintigraphy.

Nucl Med Commun 2018 Dec 10. Epub 2018 Dec 10.

Scanomed Ltd.

Introduction: Dynamic inhalation scintigraphy (DIS) with technetium-99m-diethylenetriamine-pentaacetate aerosol is a useful nuclear medicine procedure for staging and monitoring the damage of alveolocapillary membrane. The e-cigarette is a new popular smoking device producing vapor from the nicotine solution. Many studies have shown that e-cigarettes appear to be safer than smoking, but there are still debates to what extent e-cigarettes are less harmful than smoking. Read More

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December 2018

N-doping nanoporous carbon microspheres derived from MOFs for highly efficient removal of formaldehyde.

Nanotechnology 2018 Dec 10. Epub 2018 Dec 10.

Key Laboratory of Materials Physics, Chinese Academy of Sciences - Hefei Institutes of Physical Sciences, Hefei 230031, Hefei, CHINA.

Indoor formaldehyde removal is of great significance to reduce public health risk. Herein, we report a facile method for preparing N-doped nanoporous carbon through direct carbonization of MOFs (ZIF-8) to remove harmful formaldehyde (HCHO). The prepared N-doped nanoporous carbon exhibited uniform morphology and large specific surface area. Read More

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December 2018

3D tribo-nanoprinting using triboreactive materials.

Nanotechnology 2018 Dec 7. Epub 2018 Dec 7.

University of Leeds, Leeds, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND.

Tribology: the science of friction, wear and lubrication has never been associated in a positive way with the ability to manufacture at the nanoscale. Triboreactivity, when the contact between two surfaces promotes a chemical reaction, has been harnessed in this study to create highly tenacious nano-features. The reported 3D tribo-nanoprinting methodology has been demonstrated for organic and inorganic fluids on steel and silicon substrates and is adaptable through the interface tribology. Read More

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December 2018

Structure based optical properties and catalytic activities of hydrothermally prepared CuS nanostructures.

Nanotechnology 2018 Dec 10. Epub 2018 Dec 10.

State Key Laboratory for Modification of Chemical Fibres and Polymer Materials, Donghua University, 1882 West Yan' an Road, Shanghai 200051, shanghai, CHINA.

The nano-sized copper sulfides (CuS) with different morphologies were prepared by hydrothermal method without any surfactant or template. The morphology and structure of CuS were characterized by powder X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectra (XPS), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), Brunauer-Emmett-Teller (BET) and ultraviolet-visible (UV-vis) absorption spectroscopy. FESEM results show that four morphologies of CuS (flower-like nanospheres, cross-linked nanodisks, cross-linked nanoplates and nanosheets) were prepared simply by changing the hydrothermal solvent. Read More

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December 2018

Atomically thin van der waals tunnel field-effect transistors and its potential for applications.

Nanotechnology 2018 Dec 10. Epub 2018 Dec 10.

Physics, National Chung Hsing University, Taichung, TAIWAN.

Power dissipation is a crucial problem as the packing density of transistors increases in modern integrated circuits. Tunnel field-effect transistors (TFETs), which have high energy filtering provided by band-to-band tunneling (BTBT), have been proposed as an alternative electronics architecture to decrease the energy loss in bias operation and to achieve steep switching at room temperature. Very recently, the BTBT behavior has been demonstrated in van der Waals heterostructures by using unintentionally doped semiconductors. Read More

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December 2018

Advanced MoS2 and graphene heterostructures as high-performance anode for sodium-ion batteries.

Nanotechnology 2018 Dec 10. Epub 2018 Dec 10.

Xi'an Jiaotong University, Xi'an, Shaanxi, CHINA.

Layer-structured MoS2 is a promising anode material for sodium-ion batteries (SIBs) because of its high storage capacity, abundance in nature, and cost-effectiveness. However, the use of MoS2 is limited by its low electronic conductivity, inferior cycling stability, and poor rate capability. To overcome these drawbacks, liquid-phase exfoliated graphene (LEGr) was used as the support , for which MoS2@LEGr heterostructures with tunable loading amount of MoS2 were fabricated by a microwave-assisted solvothermal method. Read More

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December 2018

Triaxially uniform high-quality Al GaN (x ∼ 50%) nanowires on template free sapphire substrate.

Nanotechnology 2018 Dec 10;30(6):065603. Epub 2018 Dec 10.

Department of Electrical Engineering, Indian Institute of Technology Bombay, Mumbai-400076, India.

We have demonstrated the growth of high-quality Al GaN (x ∼ 50%) nanowires (NWs) for the first time on the sapphire substrate without using GaN NWs as the template, by plasma-assisted molecular beam epitaxy. Our newly developed process elucidates that depending on the substrate temperature and V/III ratio an AlGaN network is formed on sapphire substrate prior to the NWs growth. We find that the ledges of this kinked shaped network act as nucleation sites for the NW growth. Read More

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December 2018
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