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https://www.readbyqxmd.com/read/28749574/design-synthesis-pharmacological-evaluation-and-docking-studies-of-glun2b-selective-nmda-receptor-antagonists-with-a-benzo-7-annulen-7-amine-scaffold
#1
Sandeep Gawaskar, Louisa Temme, Julian A Schreiber, Dirk Schepmann, Alessandro Bonifazi, Dina Robaa, Wolfgang Sippl, Nathalie Strutz-Seebohm, Guiscard Seebohm, Bernhard Wünsch
Antagonists that selectively target GluN2B-subunit-containing N-methyl-d-aspartate (NMDA) receptors are of major interest for the treatment of various neurological disorders. In this study, relationships between variously substituted benzo[7]annulen-7-amines and their GluN2B affinity were investigated. 2-Nitro-5,6,8,9-tetrahydrobenzo[7]annulen-7-one (8) represents the central building block for the introduction of various substituents at the 2-position and various 7-amino moieties. N-(3-Phenylpropyl)-6,7,8,9-tetrahydro-5H-benzo[7]annulen-7-amines with a 2-NO2 (7 c), 2-Cl (15 c), or 2-OBn group (22 c) show very high GluN2B affinity (Ki =1...
July 27, 2017: ChemMedChem
https://www.readbyqxmd.com/read/28749520/photocurrent-spectroscopy-of-dye-sensitized-carbon-nanotubes
#2
Asiful Alam, Simone Dehm, Frank Hennrich, Yuriy Zakharko, Arko Graf, Moritz Pfohl, Ihteaz M Hossain, Manfred M Kappes, Jana Zaumseil, Ralph Krupke, Benjamin S Flavel
Monochiral (7,5) single walled carbon nanotubes (SWCNTs) are integrated into a field effect transistor device in which the built-in electric field at the nanotube/metal contact allows for exciton separation under illumination. Variable wavelength spectroscopy and 2D surface mapping of devices consisting of 10-20 nanotubes are performed in the visible region and a strong correlation between the nanotube's second optical transition (S22) and the photocurrent is found. After integration, the SWCNTs are non-covalently modified with three different fluorescent dye molecules with off-resonant absorption maxima at 532 nm, 565 nm, and 610 nm...
July 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28749498/black-tio2-based-core-shell-nanocomposites-as-doxorubicin-carriers-for-thermal-imaging-guided-synergistic-therapy-of-breast-cancer
#3
Wenzhi Ren, M Zubair Iqbal, Leyong Zeng, Tianxiang Chen, Yuanwei Pan, Jinshun Zhao, Hao Yin, Lili Zhang, Jichao Zhang, Aiguo Li, Aiguo Wu
TiO2 nanomaterials have been widely used for anticancer drug carriers and UV/980 nm NIR triggered cancer synergistic platforms. However, traditional pure TiO2 nanocarriers encounter some serious drawbacks, such as low drug loading ability, limited tissue penetration of UV light, and heating effect of 980 nm NIR on normal tissue, which obstruct their further application in cancer treatment. To overcome those challenges, novel mesoporous silica (mSiO2) coated black TiO2 core-shell nanocomposites are designed and constructed as doxorubicin carriers for 808 nm NIR triggered thermal imaging guided photothermal therapy combined chemotherapy of breast cancer...
July 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28749494/two-intensified-fluorescence-colors-switching-achieved-by-branched-dye-nanoaggregates
#4
Ge Ding, Yao Lu, Jihong Su, Xiaozhuan Qin, Ziping Luo, Fang Gao, Lingyun Chen, Hongru Li
In this study, a variety of branched target dyes containing double internal proton transfer segments were synthesized. For comparison, some linear analogs including a single internal proton transfer part were synthesized. The corresponding reference molecules lacking proton transfer segments were also prepared. The properties and aggregation modes of these dye aggregates were investigated on the basis of scanning electron microscopy images, transmission electron microscopy images, dynamic light scattering, X-ray diffraction, UV/visible absorption spectra and fluorescence emission spectra...
July 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28749489/optimization-of-ultra-performance-liquid-chromatography-uplc-with-fluorescence-detector-fld-method-for-the-quantitative-determination-of-selected-neurotransmitters-in-rat-brain
#5
Joanna Stragierowicz, Adam Daragó, Sławomir Brzeźnicki, Anna Kilanowicz
BACKGROUND: Glutamate (Glu) and γ-aminobutyric acid (GABA) are the main neurotransmitters in the central nervous system for excitatory and inhibitory processes, respectively. Monitoring these neurotransmitters is an essential tool in establishing pathological functions, among others in terms of occupational exposure to toxic substances. MATERIAL AND METHODS: We present modification of the HPLC (high-performance liquid chromatography) to the UPLC (ultra-performance liquid chromatography) method for the simultaneous determination of glutamate and γ-aminobutyric acid in a single injection...
July 26, 2017: Medycyna Pracy
https://www.readbyqxmd.com/read/28749447/enhanced-uptake-of-fe%C3%A2-o%C3%A2-nanoparticles-by-intestinal-epithelial-cells-in-a-state-of-inflammation
#6
Gang Zhou, Jin Zhang, Chun Pan, Naicheng Liu, Zhenheng Wang, Junfeng Zhang
Fe₃O₄ nanoparticles (Fe₃O₄ NPs) have been used for medical and drug applications, although the mechanisms of cellular uptake and transport need to be further evaluated under inflammatory conditions. In the present study, we investigated the uptake of Fe₃O₄ NPs (20, 50, 100, and 200 nm) by intestinal epithelial cells under inflammatory conditions via the light scattering of flow cytometry and inductively coupled plasma mass spectrometry (ICP-MS) techniques. The results of the correlation analysis indicated that the uptake ratios of Fe₃O₄ NPs by intestinal epithelial cells under inflammatory conditions were higher than those under the control conditions...
July 27, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28749437/curvature-and-temperature-measurement-based-on-a-few-mode-pcf-formed-m-z-i-and-an-embedded-fbg
#7
Hui Liu, Hangzhou Yang, Xueguang Qiao, Yongqiang Wang, Xiaochong Liu, Yen-Sian Lee, Kok-Sing Lim, Harith Ahmad
We have experimentally demonstrated an optical fiber Mach-Zehnder interferometer (MZI) structure formed by a few-mode photonic crystal fiber (PCF) for curvature measurement and inscribed a fiber Bragg grating (FBG) in the PCF for the purpose of simultaneously measuring temperature. The structure consists of a PCF sandwiched between two multi-mode fibers (MMFs). Bending experimental results show that the proposed sensor has a sensitivity of -1.03 nm/m(-1) at a curvature range from 10 m(-1) to 22.4 m(-1), and the curvature sensitivity of the embedded FBG was -0...
July 27, 2017: Sensors
https://www.readbyqxmd.com/read/28749374/nitrogen-doped-rgo-co3o4-nanograin-cookies-highly-porous-and-robust-catalyst-for-removing-nitrophenol-from-waste-water
#8
Erum Pervaiz, Muhammad Syam Azher Virk, Zhang Bingxue, Congling Yin, Minghui Yang
Fabrication of nanograins with uniform morphology wrapped with reduced graphene oxide (RGO) in a designed fashion is critical for obtaining large surface, high porosity and efficient catalytic ability at mild conditions. Hybrid structures of metal oxides decorated on two dimensional (2D) RGO lacked interface and channels between individual grains and RGO. Present work merely focused the synthesis of RGO wrapped Co3O4 nanograins architecture in micron sized polyhedrons and the ability of reducing aromatic nitro compounds...
July 27, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28749344/giant-magnetoresistive-biosensor-array-for-detecting-magnetorelaxation
#9
Xiahan Zhou, Chih-Cheng Huang, Drew A Hall
In this paper, a time-domain magnetorelaxometry biosensing scheme is presented using giant magnetoresistive (GMR) sensors to measure the fast relaxation response of superparamagnetic magnetic nanoparticles (MNPs) in a pulsed magnetic field. The system consists of an 8 × 10 GMR sensor array, a Helmholtz coil, an electromagnet driver, and an integrator-based analog front-end needed to capture the fast relaxation dynamics of MNPs. A custom designed electromagnet driver and Helmholtz coil improve the switch-off speed to >5 Oe/μs, limiting the dead zone time to <10 μs, and thus enables the system to monitor fast relaxation processes of 30 nm MNPs...
August 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28749340/super-resolution-imaging-of-synaptic-and-extra-synaptic-ampa-receptors-with-different-sized-fluorescent-probes
#10
Sang Hak Lee, Chaoyi Jin, En Cai, Pinghua Ge, Yuji Ishitsuka, Kai Wen Teng, Andre A de Thomaz, Duncan L Nall, Murat Baday, Okunola Jeyifous, Daniel Demonte, Christopher M Dundas, Sheldon Park, Jary Y Delgado, William N Green, Paul R Selvin
Previous studies tracking AMPA receptor (AMPAR) diffusion at synapses observed a large mobile extrasynaptic AMPAR pool. Using super-resolution microscopy, we examined how fluorophore size and photostability affected AMPAR trafficking outside of, and within, post-synaptic densities (PSDs) from rats. Organic fluorescent dyes (≈4 nm), quantum dots, either small (≈10 nm diameter; sQDs) or big (>20 nm; bQDs), were coupled to AMPARs via different-sized linkers. We find that >90% of AMPARs labeled with fluorescent dyes or sQDs were diffusing in confined nanodomains in PSDs, which were stable for 15 minutes or longer...
July 27, 2017: ELife
https://www.readbyqxmd.com/read/28749189/improved-oral-bioavailability-for-lutein-by-nanocrystal-technology-formulation-development-in-vitro-and-in-vivo-evaluation
#11
Daoxiao Chang, Yanni Ma, Guoyu Cao, Jianhuan Wang, Xia Zhang, Jun Feng, Wenping Wang
Lutein is a kind of natural carotenoids possessing many pharmacological effects. The application of lutein was limited mainly due to its low oral bioavailability caused by poor aqueous solubility. Nanocrystal formulation of lutein was developed to improve the oral bioavailability in this study. The nanosuspension was prepared by the anti-solvent precipitation-ultrasonication method and optimized by Box-Behnken design, followed by freeze-drying to obtain lutein nanocrystals. The nanocrystals were characterized on their physical properties, in vitro dissolution and in vivo absorption performance...
July 27, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28749140/geometric-dependent-drying-in-dead-end-nanochannels
#12
Quan Xie, Siyang Xiao, Chuanhua Duan
Liquid drying in nanoporous media is a key process in food, textile, oil and energy industries, but the corresponding kinetics remains poorly understood due to the structural complexity of nanoporous media. Here, we directly observe the drying process and study drying kinetics in single two-dimensional (2-D) nanochannels with height ranging from 29 nm to 122 nm. Two different drying behaviors are discovered in such nanoconfinements, continuous meniscus receding and discontinuous meniscus receding due to liquid bridge formation ahead of the meniscus, albeit similar drying rates...
July 27, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28749135/spatially-selective-high-density-placement-of-polyfluorene-sorted-semiconducting-carbon-nanotubes-in-organic-solvents
#13
Bharat Kumar, Abram L Falk, Ali Afzali, George S Tulevski, Satoshi Oida, Shu-Jen Han, James B Hannon
High performance logic based on carbon nanotubes (CNTs) requires high density arrays of selectively placed semiconducting CNTs. Although polymer-wrapping methods can allow CNTs to be sorted to a >99.9% semiconducting purity, patterning these polymer-wrapped CNTs is an outstanding problem. We report the directed self-assembly of polymer coated semiconducting CNTs using self-assembled monolayers that bind CNTs into arrays of patterned trenches. We demonstrate that CNTs can be placed into 100 nm wide HfO2 trenches with an electrical connection yield as high as 90%, and into 50 nm wide trenches with a yield as high as 70%...
July 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28749018/photoresponsive-conjugated-microporous-polymer-films-fabricated-by-electrochemical-deposition-for-controlled-release
#14
Ruiyang Zhao, Jishu Han, Mei Huang, Fusheng Liu, Lei Wang, Yuguang Ma
Stable controlled release system, conjugated microporous polymers (CMPs) with stimuli-responsive properties can be ideal structures because their 3D microporous matrix structure and possible stimulated response provide inherent switchable acceptor sites to capture and release guest molecules. Herein, the in situ electrochemical deposition of precursors (DTCzAzo) is utilized to construct highly crosslinked photoresponsive CMP films, which can reversibly undergo the trans-to-cis isomerization alternately with irradiation by 355 and 480 nm laser beams...
July 27, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28748978/degradable-polyesters-via-ring-opening-polymerization-of-functional-valerolactones-for-efficient-gene-delivery
#15
Ling Song, Ai-Xiang Ding, Ke-Xin Zhang, Bing Gong, Zhong-Lin Lu, Lan He
Degradable polymers as gene and drug carriers are emerging as one of the most promising types of materials in the biomedical and pharmaceutical areas. Herein, we report the synthesis of a series of block co-polyesters (B1-B6) and random co-polyesters (C1-C4) via ring-opening polymerization of tertiary amine-bearing valerolactone and alkylated valerolactone monomers. These polymers can completely inhibit the electrophoretic migrations of plasmid DNAs (pDNAs) at a w/w ratio of 2-6. The polyplexes of these polymers with pDNAs were steadily formed in a narrow range of sizes (75 to 220 nm) and could be effectively internalized into the cytoplasm...
July 27, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28748977/solvent-dependent-photo-induced-dynamics-in-a-non-rigidly-linked-zinc-phthalocyanine-perylenediimide-dyad-probed-using-ultrafast-spectroscopy
#16
Bryan Kudisch, Margherita Maiuri, Vicente M Blas-Ferrando, Javier Ortiz, Ángela Sastre-Santos, Gregory D Scholes
In this work, we characterize the energy and electron transfer kinetics of a zinc phthalocyanine-perylenediimide dyad (ZnPc-PDI) in various solvents using steady-state and tunable narrowband pump-probe spectroscopy. We fit the ultrafast data with global analysis techniques and find that upon excitation of the PDI moiety (pump pulse at 540 nm), the excitation energy transfer (EET) rate to the ZnPc moiety displays a solvent sensitivity that we attribute to changes in the relative equilibrium moiety orientation...
July 27, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28748781/a-versatile-liquid-chromatographic-method-for-the-simultaneous-determination-of-metformin-sitagliptin-simvastatin-and-ezetimibe-in-different-dosage-forms
#17
Asmaa A El-Zaher, Ehab F Elkady, Hanan M Elwy, Mahmoud Abo El Makarim Saleh
A new LC method is introduced with the concept of its versatile application to widely used drugs from different pharmacological classes. Metformin hydrochloride (MTF), sitagliptin phosphate (SIT), simvastatin (SIM) and ezetimibe (EZB) were simultaneously determined with a simple reversed-phase LC method in which a SIT–SIM binary mixture, present in a dosage form brand, was considered central for its development. Chromatographic separation was achieved with a mobile phase of acetonitrile and 0.02 M potassium dihydrogen phosphate (pH 5...
July 27, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28748577/selective-conversion-of-p-o-bridged-rhodamines-into-p-o-rhodols-solvatochromic-near-infrared-fluorophores
#18
Marek Grzybowski, Masayasu Taki, Shigehiro Yamaguchi
The substitution of an oxygen atom in rhodols with a phosphine oxide (P=O) moiety affords P=O-bridged rhodols as a new type of near-infrared (NIR) fluorophores. This compound class can be readily accessed upon exposure of the corresponding rhodamines to aqueous basic conditions. The electron-withdrawing effect of the P=O group facilitates the hydrolytic deamination, and, moreover, prolonged exposure to aqueous basic conditions generates P=O-bridged fluoresceins, i.e., a series of three P=O-bridged xanthene dyes is available in one simple operation...
July 27, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28748546/photonic-reactions-leading-to-fluorescence-in-a-polymeric-system-induced-by-the-photothermal-effect-of-magnetite-nanoparticles-using-a-780-nm-multiphoton-laser
#19
Bum Chul Park, Hee-Dae Kim, June Park, Yu Jin Kim, Young Keun Kim
Recently, polymer-coated magnetite (Fe3 O4 ) nanoparticles (NPs) are extensively studied for applications in therapeutics or diagnostics using photothermal effect. Therefore, it is essential to understand the interactions between Fe3 O4 NPs and polymers when optical stimuli are applied. Herein, the photonic reactions of Fe3 O4 NPs and polymer composites upon application of a 780 nm multiphoton laser are analyzed. The photonic reactions produce unique results including fluorescence from conformationally changed polymer and low-temperature phase transformation of Fe3 O4 NPs...
July 27, 2017: Small
https://www.readbyqxmd.com/read/28748298/comparison-of-sodium-hypochlorite-extrusion-by-five-irrigation-systems-using-an-artificial-root-socket-model-and-a-quantitative-chemical-method
#20
Adham A Azim, Hacer Aksel, M Margaret Jefferson, George T-J Huang
OBJECTIVES: This is to compare the volumes of irrigant apically extruded by five irrigation systems in an artificial socket model simulating clinical conditions. MATERIALS AND METHODS: Twenty extracted human single-rooted teeth were enlarged to size 40/04 and then embedded in silicone impression material. The root canal space was irrigated with nominal 3% sodium hypochlorite (NaOCl) using standard needle irrigation (SNI) with a 30-gauge notched needle, EndoActivator (EA), XP Endo Finisher (XP Endo), EndoVac (EV), and photon-induced photoacoustic streaming (PIPS)...
July 26, 2017: Clinical Oral Investigations
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