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https://www.readbyqxmd.com/read/28231451/disaggregation-of-human-islet-amyloid-polypeptide-fibril-formation-by-ruthenium-polypyridyl-complexes
#1
Dengsen Zhu, Gehui Gong, Wenji Wang, Weihong Du
The toxicity of amyloid proteins is associated with many degenerative and systematic diseases. The aggregation of human islet amyloid polypeptide may induce pancreatic β-cell death, which is linked to type II diabetes. Ruthenium complexes are inhibitors of various proteins and potential anticancer metallodrugs, which can also be used to disaggregate amyloid proteins. This work reported that several ruthenium polypyridyl complexes remarkably affected the peptide aggregation by predominant hydrophobic interaction and metal coordination, as reflected by thermodynamic parameters and mass spectrometry analysis...
February 13, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28230870/colloidal-capsules-nano-and-microcapsules-with-colloidal-particle-shells
#2
REVIEW
Tobias Bollhorst, Kurosch Rezwan, Michael Maas
Utilizing colloidal particles for the assembly of the shell of nano- and microcapsules holds great promise for the tailor-made design of new functional materials. Increasing research efforts are devoted to the synthesis of such colloidal capsules, by which the integration of modular building blocks with distinct physical, chemical, or morphological characteristics in a capsule's shell can result in novel properties, not present in previous encapsulation structures. This review will provide a comprehensive overview of the synthesis strategies and the progress made so far of bringing nano- and microcapsules with shells of densely packed colloidal particles closer to application in fields such as chemical engineering, materials science, or pharmaceutical and life science...
February 23, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28227445/quantitative-estimation-of-electro-osmosis-force-on-charged-particles-inside-a-borosilicate-resistive-pulse-sensor
#3
Mostafa Ghobadi, Yuqian Zhang, Ankit Rana, Ehsan T Esfahani, Leyla Esfandiari, Mostafa Ghobadi, Yuqian Zhang, Ankit Rana, Ehsan T Esfahani, Leyla Esfandiari, Ehsan T Esfahani, Yuqian Zhang, Ankit Rana, Mostafa Ghobadi
Nano and micron-scale pore sensors have been widely used for biomolecular sensing application due to its sensitive, label-free and potentially cost-effective criteria. Electrophoretic and electroosmosis are major forces which play significant roles on the sensor's performance. In this work, we have developed a mathematical model based on experimental and simulation results of negatively charged particles passing through a 2μm diameter solid-state borosilicate pore under a constant applied electric field. The mathematical model has estimated the ratio of electroosmosis force to electrophoretic force on particles to be 77...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227385/statistical-characterization-of-ensembles-of-symmetric-virus-particles-3-d-stochastic-signal-reconstruction-from-electron-microscope-images
#4
Nan Xu, Peter C Doerschuk, Nan Xu, Peter C Doerschuk, Nan Xu, Peter C Doerschuk
Stochastic models of nano-biomachines have been studied by 3-D reconstruction from cryo electron microscopy images in recent years. The image data is the projection of many heterogeneous instances of the object under study (e.g., a virus). Initial reconstruction algorithms require different instances of the object, while still heterogeneous, to have the same symmetry. This paper presents a maximum likelihood reconstruction approach which allows each object to lack symmetry while constraining the statistics of the ensemble of objects to have symmetry...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226256/endocrine-and-cellular-stress-effects-of-zinc-oxide-nanoparticles-and-nifedipine-in-marsh-frogs-pelophylax-ridibundus
#5
Halina Falfushynska, Lesya Gnatyshyna, Oksana Horyn, Inna Sokolova, Oksana Stoliar
Freshwater organisms including amphibians experience increasing exposures to emerging pollutants such as nanoparticles and pharmaceuticals, which can affect their fitness and performance. We studied the effects of two common pollutants extensively used in industry, pharmaceutical and personal care products, nano-zinc oxide (nZnO) and a Ca-channel blocker nifedipine (Nfd), on endocrine status and cellular stress markers of the marsh frog Pelophylax ridibundus. Males were exposed for 14days to nZnO (3.1μM), Zn(2+) (3...
February 8, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28225092/controlled-propulsion-and-separation-of-helical-particles-at-the-nanoscale
#6
Maria Michiko T Alcanzare, Vaibhav Thakore, Santtu T T Ollila, Mikko Karttunen, Tapio Ala-Nissila
Controlling the motion of nano and microscale objects in a fluid environment is a key factor in designing optimized tiny machines that perform mechanical tasks such as transport of drugs or genetic material in cells, fluid mixing to accelerate chemical reactions, and cargo transport in microfluidic chips. Directed motion is made possible by the coupled translational and rotational motion of asymmetric particles. A current challenge in achieving directed and controlled motion at the nanoscale lies in overcoming random Brownian motion due to thermal fluctuations in the fluid...
February 22, 2017: Soft Matter
https://www.readbyqxmd.com/read/28225022/core-shell-nanoparticle-arrays-double-the-strength-of-steel
#7
J-B Seol, S-H Na, B Gault, J-E Kim, J-C Han, C-G Park, D Raabe
Manipulating structure, defects and composition of a material at the atomic scale for enhancing its physical or mechanical properties is referred to as nanostructuring. Here, by combining advanced microscopy techniques, we unveil how formation of highly regular nano-arrays of nanoparticles doubles the strength of an Fe-based alloy, doped with Ti, Mo, and V, from 500 MPa to 1 GPa, upon prolonged heat treatment. The nanoparticles form at moving heterophase interfaces during cooling from the high-temperature face-centered cubic austenite to the body-centered cubic ferrite phase...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28224789/ultra-sensitive-room-temperature-operable-gas-sensors-using-p-type-na-zno-nanoflowers-for-diabetes-detection
#8
Rawat Jaisutti, Minkyung Lee, Jaeyoung Kim, Seungbeom Choi, Tae-Jun Ha, Jaekyun Kim, Hyoungsub Kim, Sung Kyu Park, Yong-Hoon Kim
Ultra-sensitive room-temperature operable gas sensors utilizing the photocatalytic activity of Na-doped p-type ZnO (Na:ZnO) nanoflowers (NFs) are demonstrated as a promising candidate for diabetes detection. The flowerlike Na:ZnO nano-particles possessing ultrathin hierarchical nanosheets were synthesized by a facile solution route at a low process temperature of 40 (o)C. It was found that the Na element acting as a p-type dopant was successfully incorporated in the ZnO lattice. Based on the synthesized p-type Na:ZnO NFs, room-temperature operable chemiresistive-type gas sensors were realized, activated by ultraviolet (UV) illumination...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28224341/enhanced-transportability-of-zero-valent-iron-nanoparticles-in-aquifer-sediments-surface-modifications-reactivity-and-particle-traveling-distances
#9
Naresh Kumar, Jérôme Labille, Nathan Bossa, Mélanie Auffan, Pierre Doumenq, Jérôme Rose, Jean-Yves Bottero
In this study, we assessed the transportability of zero valent iron nanoparticles (nano-Fe(0)) coated with different organics (carboxy methyl cellulose (CMC), poly acrylic acid (PAA), and xanthan gum) in standard porous sand and in real aquifer sediments. Our results suggest that the organic surface coatings optimized for nano-Fe(0) in porous sand media do not necessarily reflect the same transportability in real field aquifer sediment. Xanthan gum-coated nano-Fe(0) showed highest transportability in standard porous sand, but the performance was much lower in real aquifer sediment, whereas the PAA-coated nano-Fe(0) particle showed better transportability both in aquifer sediment and in porous sand media...
February 22, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28223482/a-network-perspective-reveals-decreasing-material-diversity-in-studies-on-nanoparticle-interactions-with-dissolved-organic-matter
#10
Nicole Sani-Kast, Jérôme Labille, Patrick Ollivier, Danielle Slomberg, Konrad Hungerbühler, Martin Scheringer
Dissolved organic matter (DOM) strongly influences the properties and fate of engineered nanoparticles (ENPs) in aquatic environments. There is an extensive body of experiments on interactions between DOM and ENPs and also larger particles. [We denote particles on the nano- and micrometer scale as particulate matter (PM).] However, the experimental results are very heterogeneous, and a general mechanistic understanding of DOM-PM interactions is still missing. In this situation, recent reviews have called to expand the range of DOM and ENPs studied...
February 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28223199/poly-methyl-methacrylate-with-tio2-nanoparticles-inclusion-for-stereolitographic-complete-denture-manufacturing-the-fututre-in-dental-care-for-elderly-edentulous-patients
#11
Eugenia Eftimie Totu, Aurelia Cristina Nechifor, Gheorghe Nechifor, Hassan Y Aboul-Enein, Corina Marilena Cristache
OBJECTIVES: The aim of this study was to obtain a Poly(methylmethacrylate) (PMMA)-TiO2 nanocomposite material with improved antibacterial characteristics, suitable for manufacturing 3D printed dental prosthesis. METHODS: 0.2, 0.4, 0.6, 1, 2.5 by weight% of TiO2 nanoparticles have been added to the commercially available stereolithographic PMMA material and the obtained nanocomposites have been analyzed using FTIR, SEM and also tested for antimicrobial efficacy against bacterial cultures from Candida species (C...
February 18, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28221018/low-efficiency-upconversion-nanoparticles-for-high-resolution-coalignment-of-near-infrared-and-visible-light-paths-on-a-light-microscope
#12
Sriramkumar Sundaramoorthy, Adrian Garcia Badaracco, Sophia M Hirsch, Jun Hong Park, Tim Davies, Julien Dumont, Mimi Shirasu-Hiza, Andrew C Kummel, Julie C Canman
The combination of near-infrared (NIR) and visible wavelengths in light microscopy for biological studies is increasingly common. For example, many fields of biology are developing the use of NIR for optogenetics, in which an NIR laser induces a change in gene expression and/or protein function. One major technical barrier in working with both NIR and visible light on an optical microscope is obtaining their precise coalignment at the imaging plane position. Photon upconverting particles (UCPs) can bridge this gap as they are excited by NIR light but emit in the visible range via an anti-Stokes luminescence mechanism...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28219034/preparation-of-core-shell-nanostructure-fe3o4-peg400-so3h-as-heterogeneous-and-magnetically-recyclable-nanocatalyst-for-one-pot-synthesis-of-substituted-pyrroles-by-paal-knorr-reaction-at-room-temperature
#13
Fahimeh Bonyasi, Malak Hekmati, Hojat Veisi
An efficient procedure has been proposed for the loading of sulfonic acid groups on the surface of polyethylene glycol 400 (PEG400)-encapsulated Fe3O4 nanoparticles to synthesize a core-shell Fe3O4@PEG400-SO3H nano catalyst. Surface functionalization of magnetic particles in such a way is a refined method of bridging the gap amongst heterogeneous and homogeneous catalysis. The procured nano catalyst was classified through Fourier transformed infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), wavelength-dispersive X-ray spectroscopy (WDX), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy (XPS), BET, and back titration...
February 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28218485/mechanically-milled-irregular-zinc-nanoparticles-for-printable-bioresorbable-electronics
#14
Bikram K Mahajan, Xiaowei Yu, Wan Shou, Heng Pan, Xian Huang
Bioresorbable electronics is predominantly realized by complex and time-consuming anhydrous fabrication processes. New technology explores printable methods using inks containing micro- or nano-bioresorbable particles (e.g., Zn and Mg). However, these particles have seldom been obtained in the context of bioresorbable electronics using cheap, reliable, and effective approaches with limited study on properties essential to printable electronics. Here, irregular nanocrystalline Zn with controllable sizes and optimized electrical performance is obtained through ball milling approach using polyvinylpyrrolidone (PVP) as a process control agent to stabilize Zn particles and prevent cold welding...
February 20, 2017: Small
https://www.readbyqxmd.com/read/28216554/harnessing-nanoparticles-for-immunomodulation-and-vaccines
#15
REVIEW
Ariane C Gomes, Mona Mohsen, Martin F Bachmann
The first successful use of nanoparticles (NPs) for vaccination was reported almost 40 years ago with a virus-like particle-based vaccine against Hepatitis B. Since then, the term NP has been expanded to accommodate a large number of novel nano-sized particles engineered from a range of materials. The great interest in NPs is likely not only a result of the two successful vaccines against hepatitis B and Human Papilloma Virus (HPV) that use this technology, but also due to the versatility of those small-sized particles, as indicated by the wide range of applications reported so far, ranging from medicinal and cosmetics to purely technical applications...
February 14, 2017: Vaccines
https://www.readbyqxmd.com/read/28214622/preferable-uptake-of-phosphate-by-hydrous-zirconium-oxide-nanoparticles-embedded-in-quaternary-ammonium-chinese-reed
#16
Yanan Shang, Xing Xu, Shuto Qi, Yanxia Zhao, Zhongfei Ren, Baoyu Gao
Phosphate capture from aqueous was conducted using hydrous zirconium oxide (HZO) embedded in quaternary-ammonium Chinese reed (CR-N(+)-HZO), and the characteristics of adsorbent was determined. HZO was dispersed as nanoparticles or nano-clusters on the external or inside the networking pores of CR-N(+)-HZO. The surface of CR-N(+)-HZO was heterogeneous with multiple adsorption sites, HZO nanocomposite and N(+)(CH2CH3)3Cl(-), which both contributed to the adsorption process. The phosphate uptake by CR-N(+)-HZO was optimal at pH 3...
February 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28213297/retention-of-silver-nano-particles-and-silver-ions-in-calcareous-soils-influence-of-soil-properties
#17
Samaneh Rahmatpour, Mehran Shirvani, Mohammad R Mosaddeghi, Mehdi Bazarganipour
The rapid production and application of silver nanoparticles (AgNPs) have led to significant release of AgNPs into the terrestrial environments. Once released into the soil, AgNPs could enter into different interactions with soil particles which play key roles in controlling the fate and transport of these nanoparticles. In spite of that, experimental studies on the retention of AgNPs in soils are very scarce. Hence, the key objective of this research was to find out the retention behavior of AgNPs and Ag(I) ions in a range of calcareous soils...
February 14, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28213256/carbon-polydimethylsiloxane-based-integratable-optical-technology-for-spectroscopic-analysis
#18
Hiroaki Nomada, Kinichi Morita, Hirokazu Higuchi, Hiroaki Yoshioka, Yuji Oki
A polydimethylsiloxane (PDMS)-based optical system has been demonstrated. To suppress intense background radiation due to multiple internal scatting in a transparent material, a composite structure of a carbon-PDMS compound and PDMS was proposed. The index matching of the real part of the refractive index can suppress internal scattering, and an absorption of 99-99.7% was attained by using carbon micro particles and carbon nano tubes. The black-PDMS light channel functions as a light filter for straight pass, and an optical density of 5 was obtained by bending the filter...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28211673/capillary-microfluidics-assembled-virus-like-particle-bio-nano-receptor-interfaces-for-label-free-biosensing
#19
Faheng Zang, Konstantinos Gerasopoulos, Adam D Brown, James N Culver, Reza Ghodssi
In this paper, a capillary microfluidics-integrated sensor system is developed for rapid assembly of bionanoreceptor interfaces on-chip and label-free biosensing. Genetically engineered Tobacco mosaic virus (TMV) virus-like particle (VLP), displaying thousands copies of identical receptor peptides FLAG-tags, are utilized as nanoceptors for antibody sensing. Controlled and accelerated assembly of VLP receptor layer on impedance sensor has been achieved using capillary effect and surface evaporation from an open-channel capillary microfluidic system...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211360/the-effect-of-silica-thickness-on-nano-tio2-particles-for-functional-polyurethane-nanocomposites
#20
Chao Chen, Wei Wu, William Z Xu, Paul A Charpentier
In order to help reduce the agglomeration of TiO2 nanoparticles in polyurethane coatings while enhancing their photoactivity and mechanical/physical properties, this work examined encapsulating TiO2 nanoparticles in a thin layer of SiO2, prior to their nanocomposite polymerization. By applying a Stöber process, varying thicknesses of SiO2 were successfully coated onto the surface of anatase and rutile TiO2 nanoparticles. The methylene blue results showed that different loadings of SiO2 onto the TiO2 surface significantly influenced their photocatalytic activity...
March 17, 2017: Nanotechnology
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