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Lingyu Li, Yanni Jiao, Tianyun Jin, Hongxiang Sun, Shaoqiang Li, Cuirong Jin, Shuiyao Hu, Jianbo Ji, Lan Xiang
AIMS: Chelation therapy and antioxidant supplements have been demonstrated to be useful in ameliorating aluminum (Al) induced neurotoxicity. Oleracein E (OE) is a phenolic antioxidant alkaloid which possesses a rare tetrahydroisoquinoline/pyrrolidone tricyclic skeleton and a catechol moiety. The aim of this study was to investigate whether OE can chelate with Al and alleviate AlCl3-induced oxidative stress and neurotoxicity. MAIN METHODS: Kunming mice were administered AlCl3 (40mg/kg/d, i...
October 17, 2017: Life Sciences
Healin Im, Seok Hwan Jeong, Dong Hyuk Park, Sunkook Kim, Young Ki Hong
After reporting on the two-step anodization, nanoporous anodic aluminum oxides (AAOs) have been widely utilized in the versatile fields of fundamental sciences and industrial applications owing to their periodic arrangement of nanopores with relatively high aspect ratio. However, the techniques reported so far, which could be only valid for mono-surface anodization, show critical disadvantages, i.e., time-consuming as well as complicated procedures, requiring toxic chemicals, and wasting valuable natural resources...
October 5, 2017: Journal of Visualized Experiments: JoVE
Galina Shcherbakova, Pavel Storozhenko, Alexander Kisin
We have drawn a few interesting conclusions while studying reaction products of Ph₂Si(OH)₂ with Al((i)Bu)₃ and tetraisobutylalumoxane. In the first place, this is the production (at a Ph₂Si(OH)₂ and Al((i)Bu)₃ equimolar ratio) of an oligomer siloxyalumoxane structure with alternating four- and six-member rings. In addition, it shows isobutyl and phenyl group migration between aluminum and silicon due to the formation of an intramolecular four-member cyclic complex [Ph₂(OH)SiO]Al((i)Bu)₂ → [((i)Bu)Ph(OH)SiO]Al((i)Bu)Ph...
October 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Xiaobo Pan, Xinyue Liang, Longfang Yao, Xinyi Wang, Yueyue Jing, Jiong Ma, Yiyan Fei, Li Chen, Lan Mi
TiO₂ nanoparticles modified with phthalocyanines (Pc) have been proven to be a potential photosensitizer in the application of photodynamic therapy (PDT). However, the generation of reactive oxygen species (ROS) by TiO₂ nanoparticles modified with Pc has not been demonstrated clearly. In this study, nitrogen-doped TiO₂ conjugated with Pc (N-TiO₂-Pc) were studied by means of monitoring the generation of ROS. The absorbance and photokilling effect on HeLa cells upon visible light of different regions were also studied and compared with non-doped TiO₂-Pc and Pc...
October 20, 2017: Nanomaterials
Silvia Bonfanti, Alessandro Taloni, Carlotta Negri, Alessandro Sellerio, Nicola Manini, Stefano Zapperi
Macroscopic frictional sliding emerges from atomic-scale interactions and processes at the contact interface, but bridging the gap between micro and macro scales still remains an unsolved challenge. Direct imaging of the contact surface and simultaneous measurement of stress fields during macroscopic frictional slip revealed the formation of crack precursors, questioning the traditional picture of frictional contacts described in terms of a single degree of freedom. Here we study the onset of frictional slip at atomic scale by simulating the motion of an aluminum block pushed by a slider on a copper substrate...
October 20, 2017: Journal of Physical Chemistry Letters
Marios E Myronakis, Rony Fueglistaller, Joerg Rottmann, Yue-Houng Hu, Adam Wang, Paul Baturin, Pascal Huber, Daniel Morf, Josh M Star-Lack, Ross I Berbeco
We assess the feasibility of clinical megavoltage (MV) spectral imaging for material and bone separation with a novel multi-layer imager (MLI) prototype. The MLI provides higher detective quantum efficiency and lower noise than conventional electronic portal imagers. Simulated experiments were performed using a validated Monte Carlo model of the MLI to estimate energy absorption and energy separation between the MLI components. Material separation was evaluated experimentally using solid water and aluminum (Al), copper (Cu) and gold (Au) for 2...
October 20, 2017: Physics in Medicine and Biology
Ozge Parlar Oz, Asli Secilmis, Cemal Aydin
BACKGROUND: Glass fiber-reinforced posts have been preferred frequently because of some physical properties similar to the dentin, chemically bonding to dentin, biocompatibility, and esthetics. OBJECTIVE: This study aimed to evaluate the microleakage and bond strength of glass fiber posts cemented with various adhesive systems on laser-etched root canal walls. METHODS: Roots of 120 human mandibular premolars were divided into two groups for push-out bond strength test and the microleakage test (n = 60)...
October 19, 2017: Photomedicine and Laser Surgery
Lyudmila A Lapkina, Vladimir E Larchenko, Gayane A Kirakosyan, Aslan Yu Tsivadze, Sergey I Troyanov, Yulia G Gorbunova
The supramolecular dimeric complex [(μ-oxo)bis(tetra-15-crown-5-phthalocyaninato)(nicotinato)aluminum(III)]tetra(rubidium) bis(nicotinate) was prepared by addition of an excess of a methanol solution of rubidium nicotinate to a chloroform solution of the aluminum crown-phthalocyaninate, [(HO)Al(15C5)4Pc]. A single-crystal X-ray diffraction study of {[Rb4(NicAl(15C5)4Pc)2(μ-O)](2+)(Nic(-))2}·2.36HNic·11H2O demonstrated that two molecules of the aluminum crown-phthalocyaninate nicotinate are connected through an Al-O-Al bridge supported by sandwiching of crown ether moieties by Rb(+) cations...
October 20, 2017: Inorganic Chemistry
Jaimar C Rincon, Angela L Cuenca, Steven L Raymond, Brittany Mathias, Dina C Nacionales, Ricardo Ungaro, Philip A Efron, James L Wynn, Lyle L Moldawer, Shawn D Larson
The high mortality in neonatal sepsis has been related to both quantitative and qualitative differences in host protective immunity. Especially in the premature neonate where outcomes from sepsis are so dismal, pretreatment strategies to prevent sepsis have received inadequate consideration. Aluminum-based adjuvants (alum) are currently used in many pediatric vaccines, but their use as an innate immune stimulant alone has not been well studied. We asked whether pre-treatment with alum adjuvant alone could improve outcome and host innate immunity in neonatal mice given polymicrobial sepsis...
October 20, 2017: Clinical and Experimental Immunology
Jessica F Hoffman, Vernieda B Vergara, Steven R Mog, John F Kalinich
Hydrophobic sand is a relatively new method of urine collection in the rodent, comparable to the established method using a metabolic cage. Urine samples are often used in rodent research, especially for biomarkers of health changes after internal contamination from embedded metals, such as in a model of a military shrapnel wound. However, little research has been done on the potential interference of hydrophobic sand with urine metal concentrations either by contamination from the sand particulate, or adsorption of metals from the urine...
October 11, 2017: Toxics
Matthieu David, Damien Connétable
While diffusion mechanisms of interstitial elements in fcc systems are generally well-known, especially in the case of H atoms, we show in this work that even in the case of a simple metallic system (aluminum), the diffusion of interstitials exhibits a wide variety of paths and mechanisms that depend on the specie. We used an approach based on first-principles calculations associated with kinetic Monte-Carlo simulations and a multi-state diffusion formalism to compute the diffusion coefficients of five interstitial elements: hydrogen, boron, carbon, nitrogen and oxygen...
October 19, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Keith Dusoe, Xinyi Ye, Kim Kisslinger, Aaron Stein, Seok-Woo Lee, Chang-Yong Nam
Modulus of resilience, the measure of a material's ability to store and release elastic strain energy, is critical for realizing advanced mechanical actuation technologies in micro/nanoelectromechanical systems. In general, engineering the modulus of resilience is difficult because it requires asymmetrically increasing yield strength and Young's modulus against their mutual scaling behavior. This task becomes further challenging if it needs to be carried out at the nanometer scale. Here, we demonstrate organic-inorganic hybrid composite nanopillars with one of the highest modulus of resilience per density, by utilizing vapor-phase aluminum oxide infiltration in lithographically patterned negative photoresist SU-8...
October 19, 2017: Nano Letters
Joseph W Bennett, Jennifer L Bjorklund, Tori Z Forbes, Sara E Mason
The interactions between aqueous aluminum (Al) nanoclusters and ions in solution influence the reactivity of nanomaterials in natural waters and are crucial to the targeted syntheses of aluminum oxides. To contribute to the fundamental understanding of how both anion and Al-nanocluster properties affect the interactions, we carry out systematic modeling studies that employ density functional theory calculations embedded in a continuum solvent model. Energetic and electronic structure analysis is applied toward delineating the interactions of a range of probe adsorbate anions with Al nanoclusters to elucidate how small molecules may react with naturally occurring nanomaterials...
October 19, 2017: Inorganic Chemistry
Michel Y Fares, Nada S Abdelwahab, Maha M Abdelrahman, Hamdy M Abdel-Rahman
Two accurate, precise and highly selective stability-indicating methods were adopted for simultaneous determination of benztropine mesylate (BNZ) in presence of its hepatotoxic and carcinogenic degradation product, benzophenone (BPH) either in pure form or in the pharmaceutical formulation without any preliminary separation steps. The first method is a thin layer chromatography (TLC)-densitometric method that depended on separation of BNZ from its degradate on TLC aluminum plates precoated with silica gel 60 F254 as the stationary phase using a developing system consisted of hexane:methylene chloride:triethylamine (5:5:0...
October 1, 2017: Journal of Chromatographic Science
Christoph Gerhard, Daniel Tasche, Olivier Uteza, Jörg Hermann
We report on investigations of the spatial variations of contamination, roughness, and index of refraction of classically manufactured polished fused silica surfaces. Therefore, laser-induced breakdown spectroscopy was used to probe surface and subsurface impurities via the detection of aluminum. Measurements at different positions on the surface of the cylindrical fused silica windows evidenced an almost contamination-free center region, whereas a relatively large contamination area was found close to the edge...
September 10, 2017: Applied Optics
Quanxin Na, Chunqing Gao, Qing Wang, Yixuan Zhang, Mingwei Gao, Meng Zhang, Yujia Wang
In this paper, we report the experimental realization of a high-repetition-rate single-frequency Ho-doped yttrium aluminum garnet (Ho:YAG) ring laser at 2.09 μm. Single-frequency operation of the ring laser is achieved by injection-seeding with a continuous wave (CW) Ho:YAG non-planar ring oscillator (NPRO) laser. The output energy of the ring laser is 6.24 mJ with a pulse width of 172 ns and a repetition rate of 1 kHz. The beam quality M(2)-factor is measured to be ∼1.3 at the maximum output energy...
September 1, 2017: Applied Optics
Donghai Niu, Shiqi Sun, Qiang Xu, Minghui Jiang, Xibin Wang, Zhiyong Li, Changming Chen, Yuanda Wu, Daming Zhang
In this paper, the power-consumption characteristics of a polymeric thermo-optic (TO) switch consisting of a silica under-cladding on silicon substrate, a polymer core surrounded with polymer upper-cladding, and aluminum heating electrodes with different widths were investigated. Norland optical adhesive 73 with a larger TO coefficient was selected as the core layer, which could reduce the power consumption effectively. The silica under-cladding, with large thermal conductivity, could shorten the response time...
July 20, 2017: Applied Optics
Anna Petrova-Mayor, Sarah Knudsen
The induced polarization effects of metal-coated mirrors were studied in the configurations of one- and two-mirror lidar scanners as a function of azimuth and elevation angles. The theoretical results were verified experimentally for three types of mirrors (custom enhanced gold, off-the-shelf protected gold, and protected aluminum). A method was devised and tested to maintain a desired polarization state (linear or circular) of the transmit beam for all pointing directions by means of rotating wave plates in the transmit and detection paths...
May 20, 2017: Applied Optics
Zheng Li, Shiling Yan, Qingnan Xie, Chenyin Ni, Zhonghua Shen
The ultrasonic bulk waves generated by a high-power continuous laser scanning along the surface of aluminum material were theoretically investigated. Although the temperature rise generated by this scanning laser irradiation was small, it provided a large temperature gradient, which was able to generate measurable ultrasonic waves. Detailed discussions were given to the influence of scanning speed on the generation propagation direction and the amplitude of the wavefront. The longitudinal and transverse waves would be generated in the material only when the scanning speeds reached a certain range...
May 20, 2017: Applied Optics
N Dorh, A Sarua, T Ajmal, J Okache, C Rega, G M Müller, M J Cryan
This paper presents measured fluorescence enhancement results for ∼250×250 element aluminum nanoantenna arrays fabricated using electron beam lithography. The arrays have been designed to use diffractive coupling to enhance and control the direction of fluorescent emission. Highly directional emission is obtained at the designed angles with beam widths simulated to be in the range of 4-6°. Angle-resolved spectroscopy measurements of dye-coated nanoantenna arrays were in good agreement with finite difference time domain modeling...
October 10, 2017: Applied Optics
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