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https://www.readbyqxmd.com/read/29469604/dissolved-organic-matter-and-aluminum-oxide-nanoparticles-synergistically-cause-cellular-responses-in-freshwater-microalgae
#1
Nan Ye, Zhuang Wang, Se Wang, Hao Fang, Degao Wang
This study investigated the impact of dissolved organic matters (DOM) on the ecological toxicity of aluminum oxide nanoparticles (Al2 O3 NPs) at a relatively low exposure concentration (1 mg L-1 ). The unicellular green alga Scenedesmus obliquus was exposed to Al2 O3 NP suspensions in the presence of DOM (fulvic acid) at various concentrations (1, 10, and 40 mg L-1 ). The results show that the presence of DOM elevated the growth inhibition toxicity of Al2 O3 NPs towards S. obliquus in a dose-dependent manner...
February 22, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29455539/immunological-evaluation-of-chitosan-nanoparticles-loaded-with-tetanus-toxoid
#2
M Ghalavand, M Saadati, A Ahmadi, E Abbasi, J Salimian
OBJECTIVES: The present study was aimed at comparing tetanus toxoid (TT)‑loaded-chitosan nanoparticles with aluminum hydroxide as a common vaccine adjuvant. BACKGROUND: Tetanus remains to be a major public health problem. Nanoparticles have been extensively used as immune adjuvants. Tetanus toxoid (TT) encapsulated in chitosan nanoparticles is considered to be a promising tetanus vaccine candidate. METHODS: TT‑loaded chitosan nanoparticles were prepared by the ionic gelation method...
2018: Bratislavské Lekárske Listy
https://www.readbyqxmd.com/read/29449637/facile-emulsion-mediated-synthesis-of-phase-pure-diopside-nanoparticles
#3
Elena Tajuelo Rodriguez, Lawrence M Anovitz, Caleb D Clement, Adam J Rondinone, Michael C Cheshire
Diopside is a common natural pyroxene that is rarely found in a pure state, since magnesium is often partially substituted by iron, and other elements (sodium and aluminum) are often present. This pyroxene, along with feldspars and olivines, is common in concrete. As the prospective license renewal of light water reactors to 80 years of operation has raised concerns on the effects of radiation in the concrete biological shield surrounding the reactors, mineral nanoparticles can be valuable to perform amorphization studies to inform predictive models of mechanical properties of irradiated concrete...
February 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29438908/in-situ-monitoring-of-pthlh-secretion-in-neuroblastoma-cells-cultured-onto-nanoporous-membranes
#4
Alfredo de la Escosura-Muñiz, Marisol Espinoza-Castañeda, Alejandro Chamorro-García, Carlos J Rodríguez-Hernández, Carmen de Torres, Arben Merkoçi
In this work, we propose for the first time the use of anodic aluminum oxide (AAO) nanoporous membranes for in situ monitoring of parathyroid hormone-like hormone (PTHLH) secretion in cultured human cells. The biosensing system is based on the nanochannels blockage upon immunocomplex formation, which is electrically monitored through the voltammetric oxidation of Prussian blue nanoparticles (PBNPs). Models evaluated include a neuroblastoma cell line (SK-N-AS) and immortalized keratinocytes (HaCaT) as a control of high PTHLH production...
February 3, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29432151/identification-and-paleoclimatic-significance-of-magnetite-nanoparticles-in-soils
#5
Imad A M Ahmed, Barbara A Maher
In the world-famous sediments of the Chinese Loess Plateau, fossil soils alternate with windblown dust layers to record monsoonal variations over the last ∼3 My. The less-weathered, weakly magnetic dust layers reflect drier, colder glaciations. The fossil soils (paleosols) contain variable concentrations of nanoscale, strongly magnetic iron oxides, formed in situ during the wetter, warmer interglaciations. Mineralogical identification of the magnetic soil oxides is essential for deciphering these key paleoclimatic records...
February 5, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29425026/label-free-detection-of-tetramolecular-i-motif-by-surface-enhanced-raman-spectroscopy
#6
Yang Li, Xiao Xia Han, Yuting Yan, Yanwei Cao, Xiaoxuan Xiang, Sheng Wang, Bing Zhao, Xinhua Guo
Surface-enhanced Raman spectroscopy (SERS) can probe DNA primary structure; however, the direct analysis of DNA sec-ondary structure is still technically challenging. In this study, we developed a novel method based on introducing aluminum ion as the aggregation agent for silver nanoparticles, affording high quality SERS signals of tetramolecular DNA. Thus, the for-mation of tetramolecular i-motifs was precisely analyzed by SERS signals for the first time and structural features involving glycosidic torsion, protonated cytosine, and cytosine rings were investigated...
February 9, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29420670/influence-of-humic-acid-and-dihydroxy-benzoic-acid-on-the-agglomeration-adsorption-sedimentation-and-dissolution-of-copper-manganese-aluminum-and-silica-nanoparticles-a-tentative-exposure-scenario
#7
Sulena Pradhan, Jonas Hedberg, Jörgen Rosenqvist, Caroline M Jonsson, Susanna Wold, Eva Blomberg, Inger Odnevall Wallinder
This work focuses on kinetic aspects of stability, mobility, and dissolution of bare Cu, Al and Mn, and SiO2 NPs in synthetic freshwater (FW) with and without the presence of natural organic matter (NOM). This includes elucidation of particle and surface interactions, metal dissolution kinetics, and speciation predictions of released metals in solution. Dihydroxy benzoic acid (DHBA) and humic acid adsorbed rapidly on all metal NPs (<1 min) via multiple surface coordinations, followed in general by rapid agglomeration and concomitant sedimentation for a large fraction of the particles...
2018: PloS One
https://www.readbyqxmd.com/read/29411800/nonvolatile-ternary-resistive-switching-memory-devices-based-on-the-polymer-composites-containing-zinc-oxide-nanoparticles
#8
Yanmei Sun, Dianzhong Wen, Xuduo Bai
Nonvolatile ternary memory devices were fabricated from the composites polymer blends containing zinc oxide (ZnO) nanoparticles. When applying a negative bias on the top electrode, the fabricated devices with a simple sandwich structure of indium tin oxide (ITO)/composite polymer/aluminum (Al) exhibited three distinct resistance states, which could be labeled as "OFF", "ON1" and "ON2" for ternary data storage application. The ITO/polystyrene (PS) + ZnO/Al devices can endure 3 × 104 read-cycles and exhibit a retention time of 104 s...
February 7, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29406756/fourier-transform-surface-plasmon-resonance-of-nanodisks-embedded-in-magnetic-nanorods
#9
Insub Jung, Seongkeun Ih, Haneul Yoo, Seunghun Hong, Sungho Park
In this study, we demonstrate the synthesis and application of magnetic plasmonic gyro-nanodisks (GNDs) for Fourier transform surface plasmon resonance-based biodetection. Plasmonically-active and magnetically-responsive gyro-nanodisks were synthesized using electrochemical methods with anodized aluminum templates. Due to the unique properties of GNDs (magnetic responsiveness and surface plasmon bands), periodic extinction signals were generated under an external rotating magnetic field, which is in turn converted into frequency domains using Fourier-transform...
February 6, 2018: Nano Letters
https://www.readbyqxmd.com/read/29375970/turning-the-old-adjuvant-from-gel-to-nanoparticles-to-amplify-cd8-t-cell-responses
#10
Hao Jiang, Qin Wang, Lin Li, Qin Zeng, Hanmei Li, Tao Gong, Zhirong Zhang, Xun Sun
Due to its safety and efficacy, aluminum hydroxide is used as an immune adjuvant in human vaccines for over 80 years. Being a Th2 stimulator, the classical gel-like adjuvant, however, fails to generate CD8+ T cell responses, which are important for cancer vaccines. Here, aluminum hydroxide is turned from gel into nano-sized vaccine carriers AlO(OH)-polymer nanoparticles (APNs) to promote their lymphatic migration. After actively uptaken via scavenger receptor-A by antigen-presenting cells (APCs) resident in lymph nodes (LNs), APNs destabilize lysosomes resulting in efficient cytosolic delivery and cross-presentation of antigens...
January 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/29364840/suppressing-the-photocatalytic-activity-of-tio%C3%A2-nanoparticles-by-extremely-thin-al%C3%A2-o%C3%A2-films-grown-by-gas-phase-deposition-at-ambient-conditions
#11
Jing Guo, Hao Van Bui, David Valdesueiro, Shaojun Yuan, Bin Liang, J Ruud van Ommen
This work investigated the suppression of photocatalytic activity of titanium dioxide (TiO₂) pigment powders by extremely thin aluminum oxide (Al₂O₃) films deposited via an atomic-layer-deposition-type process using trimethylaluminum (TMA) and H₂O as precursors. The deposition was performed on multiple grams of TiO₂ powder at room temperature and atmospheric pressure in a fluidized bed reactor, resulting in the growth of uniform and conformal Al₂O₃ films with thickness control at sub-nanometer level...
January 24, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29364258/nanothermite-with-meringue-like-morphology-from-loose-powder-to-ultra-porous-objects
#12
Cédric Martin, Marc Comet, Fabien Schnell, Denis Spitzer
The goal of the protocol described in this article is to prepare aluminothermic compositions (nanothermites) in the form of porous, monolithic objects. Nanothermites are combustible materials made up of inorganic fuel and an oxidizer. In nanothermite foams, aluminum is the fuel and aluminum phosphate and tungsten trioxide are the oxidizing moieties. The highest flame propagation velocities (FPVs) in nanothermites are observed in loose powders and FPVs are strongly decreased by pelletizing nanothermite powders...
December 24, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29358569/using-impedance-measurements-to-characterize-surface-modified-with-gold-nanoparticles
#13
Scott MacKay, Gaser N Abdelrasoul, Marcus Tamura, Donghai Lin, Zhimin Yan, Jie Chen
With the increased practice of preventative healthcare to help reduce costs worldwide, sensor technology improvement is vital to patient care. Point-of-care (POC) diagnostics can reduce time and lower labor in testing, and can effectively avoid transporting costs because of portable designs. Label-free detection allows for greater versatility in the detection of biological molecules. Here, we describe the use of an impedance-based POC biosensor that can detect changes in the surface modification of a micro-fabricated chip using impedance spectroscopy...
September 18, 2017: Sensors
https://www.readbyqxmd.com/read/29356548/thermoplasmonic-ignition-of-metal-nanoparticles
#14
Mehmet Mutlu, Juhyung Kang, Søren Raza, David T Schoen, Xiaolin Zheng, Pieter G Kik, Mark L Brongersma
Explosives, propellants, and pyrotechnics are energetic materials that can store and quickly release tremendous amounts of chemical energy. Aluminum (Al) is a particularly important fuel in many applications because of its high energy density, which can be released in a highly exothermic oxidation process. The diffusive oxidation mechanism (DOM) and melt-dispersion mechanism (MDM) explain the ways powders of Al nanoparticles (NPs) can burn, but little is known about the possible use of plasmonic resonances in NPs to manipulate photo-ignition...
January 22, 2018: Nano Letters
https://www.readbyqxmd.com/read/29341615/merely-measuring-the-uv-visible-spectrum-of-gold-nanoparticles-can-change-their-charge-state
#15
Jose Navarrete, Chris Siefe, Samuel Alcantar, Michael Belt, Galen D Stucky, Martin Moskovits
Metallic nanostructures exhibit a strong plasmon resonance at a wavelength whose value is sensitive to the charge density in the nanostructure, its size, shape, interparticle coupling and the dielectric properties of its surrounding medium. Here we use UV-Visible transmission and reflectance spectroscopy to track the shifts of the plasmon resonance in an array of gold nanoparticles buried under metal-oxide layers of varying thickness produced using atomic layer deposition (ALD), then coated with bulk layers of one of three metals: aluminum, silver, and gold...
January 17, 2018: Nano Letters
https://www.readbyqxmd.com/read/29339576/a-thermodynamics-model-for-morphology-prediction-of-aluminum-nano-crystals-fabricated-by-inert-gas-condensation-method
#16
Yu Wen, Dehong Xia
The purpose of this study is to provide scientific guidance for morphological control of nanoparticle synthesis by gas phase method. A universal thermodynamics model is developed to predict morphology of nanoparticles fabricated by inert gas condensation method. By the use of the model, morphologies of aluminum nanocrystals are predicted under various preparation conditions. There are two kinds of energies that determine the formation of nanoparticles morphology jointly, which are Gibbs free energy for nanoparticles and energy variation during the process...
January 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29334279/uric-acid-and-the-vaccine-adjuvant-activity-of-aluminum-oxy-hydroxide-nanoparticles
#17
Sachin G Thakkar, Haiyue Xu, Xu Li, Zhengrong Cui
In an effort to improve the adjuvanticity of insoluble aluminum salts, we discovered that the adjuvant activity of aluminum salt nanoparticles is significantly stronger than aluminum salt microparticles, likely related to nanoparticle's stronger ability to directly activate NLRP3 inflammasome as the nanoparticles are more efficiently taken up by phagocytic cells. Endogenous signals such as uric acid from cell damage or death caused by the cytotoxicity of aluminum salts are thought to indirectly activate inflammasome, prompting us to hypothesize that the potent adjuvant activity of aluminum salt nanoparticles is also related to their ability to stimulate uric acid production...
January 15, 2018: Journal of Drug Targeting
https://www.readbyqxmd.com/read/29322392/effect-of-inorganic-and-organic-solutes-on-zero-valent-aluminum-activated-hydrogen-peroxide-and-persulfate-oxidation-of-bisphenol-a
#18
Idil Arslan-Alaton, Tugba Olmez-Hanci, Tugce Ozturk
The effect of varying inorganic (chloride, nitrate, sulfate, and phosphate) and organic (represented by humic acid) solutes on the removal of aqueous micropollutant bisphenol A (BPA; 8.8 μM; 2 mg/L) with the oxidizing agents hydrogen peroxide (HP; 0.25 mM) and persulfate (PS; 0.25 mM) activated using zero-valent aluminum (ZVA) nanoparticles (1 g/L) was investigated at a pH of 3. In the absence of the solutes, the PS/ZVA treatment system was superior to the HP/ZVA system in terms of BPA removal rates and kinetics...
January 10, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29318307/preparation-and-investigation-of-the-thermal-stability-of-phosphate-modified-tio2-anatase-powders-and-thin-films
#19
Uroš Prah, Irena Kozjek Škofic
The temperature dependence of the anatase-to-rutile phase transition of TiO2 powders and thin films was studied. In order to shift the phase transition to higher temperature, samples were doped with a different amount of phosphate ions and their influence on the structure and thermal stability of the anatase phase was investigated. In addition, the effect of the catalyst form (powders or thin films) on the temperature of the anatase-to-rutile phase transition was observed. TiO2 thin films and powders were prepared using a simple sol-gel method with an alkoxide precursor and citric acid...
December 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/29303175/nanoporous-anodic-aluminum-oxide-internalized-with-gold-nanoparticles-for-on-chip-pcr-and-direct-detection-by-surface-enhanced-raman-scattering
#20
B M Tran, N N Nam, S J Son, N Y Lee
Nanoporous anodic aluminum oxide internalized with gold nanoparticles was utilized as an integrated platform miniaturized for consecutively performing on-chip PCR and downstream detection of the amplified product of a 183 bp eaeA gene fragment from Escherichia coli O157:H7 using surface-enhanced Raman scattering (SERS).
January 5, 2018: Analyst
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