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https://www.readbyqxmd.com/read/29216431/photochemistry-of-acetohydroxamic-acid-in-solid-argon-ftir-and-theoretical-studies
#1
Magdalena Sałdyka, Zofia Mielke
The products formed during exposure of the CH3CONHOH/Ar (AHA/Ar) matrices to the full output of the Xe lamp and to 225 nm OPO radiation are studied. The irradiation promotes the isomerization, 1Z -1E, and AHA photodissociation reactions. Four pairs of co-products are experimentally found to appear in the photolysis, they form the complexes: CH3OH-HNCO (1), H2O-CH3NCO (2), H2O-CH3CNO (3) and CO-CH3NHOH (4). The structures of the complexes were optimized at the MP2 computational level with the 6-311++G(2d,2p) and aug-cc-pVTZ basis sets...
December 7, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29215307/effects-of-intravitreous-sodium-hydrosulfide-on-intraocular-pressure-and-retinopathy-in-ocular-hypertensive-rats
#2
M A Özer, Z Erişgin, S Özen, Y Tekelioğlu, S Takır
We investigated the possible neuroprotectant and intraocular pressure (IOP) lowering effects of intravitreous injection of sodium hydrosulfide (NaSH) in a rodent model of experimental glaucoma. Glaucoma currently is treated by controlling IOP using medications and/or surgery. These methods are not entirely adequate for all patients. We divided 24 rats into three groups. For the control group, the right eye was treated with intravitreous saline. For the glaucoma group, ocular hypertension was induced by photocoagulating three episcleral veins and the limbal plexus of the right eye using an argon laser, then saline was injected into the vitreous of these eyes during the third week...
December 7, 2017: Biotechnic & Histochemistry: Official Publication of the Biological Stain Commission
https://www.readbyqxmd.com/read/29211486/adsorption-on-nanopores-of-different-cross-sections-made-by-e-beam-nanolithography
#3
Lorenzo Bruschi, Giampaolo Mistura, Luisa Prasetyo, Duong Dang Do, Michele Dipalo, Francesco De Angelis
Adsorption on nanoporous matrices is characterized by a pronounced hysteresis loop in the adsorption isotherm, when the substrate is loaded and unloaded with adsorbate, the origin of which is a matter of immense debate in the literature. In this work, we report a study of argon adsorption at 85K on non-connecting nanopores with one end closed to the surrounding where the effects of different pore cross-sections fabricated by the electron beam lithography (EBL) are investigated. A polymethylmethacrylate (PMMA) resist is deposited on the electrodes of a sensitive quartz crystal microbalance without degradation of the resonance quality factor or the long-term and short-term stabilities of the device even at cryogenic temperatures...
December 6, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29207461/effect-of-solution-treatment-on-precipitation-behaviors-age-hardening-response-and-creep-properties-of-elektron21-alloy-reinforced-by-aln-nanoparticles
#4
Abdollah Saboori, Elisa Padovano, Matteo Pavese, Hajo Dieringa, Claudio Badini
In the present study, the solution and ageing treatments behavior of Mg-RE-Zr-Zn alloy (Elektron21) and its nano-AlN reinforced nanocomposites have been evaluated. The properties of the thermal-treated materials were investigated in terms of Vickers hardness, the area fraction of precipitates, microstructure and phase composition. The solution treatments were performed by treating at 520 °C, 550 °C and 580 °C in argon atmosphere. The outcomes show that the hardness of the solutionized alloys was slightly affected by the solution temperature...
December 2, 2017: Materials
https://www.readbyqxmd.com/read/29206028/direct-electrical-detection-of-iodine-gas-by-a-novel-metal-organic-framework-based-sensor
#5
Leo J Small, Tina M Nenoff
High fidelity detection of iodine species is of utmost importance to the safety of the population in cases of nuclear accidents or advanced nuclear fuel reprocessing. Herein we describe the success at using impedance spectroscopy to directly detect the real time adsorption of I2 by a metal-organic framework (MOF) ZIF-8 based sensor. Methanolic suspensions of ZIF-8 were drop cast onto platinum interdigitated electrodes, dried, and exposed to gaseous I2 at 25, 40, or 70 C. Using an unoptimized sensor geometry, I2 was readily detected at 25 C in air within 720 s of exposure...
December 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29202683/successful-use-of-snare-electrocautery-via-flexible-fiberoptic-bronchoscopy-for-removal-of-an-endobronchial-hamartoma-causing-chronic-lung-atelectasis-and-mimicking-malignancy
#6
Chao Liu, Jia-Jia Wang, Ye-Han Zhu, Cheng Chen
We present a rare case of giant endobronchial hamartoma coexisting with lung atelectasis for more than 3 years. The small specimen initially biopsied via bronchoscope did not reveal tissue features, but some features were suspicious for squamous cell carcinoma. The lesion was removed completely using snare electrocautery combined with argon plasma coagulation via flexible fiberoptic bronchoscopy. The patient made a satisfactory recovery, and a pathological diagnosis was made. This could be a useful option in selected endobronchial tumors...
December 2017: Therapeutic Advances in Respiratory Disease
https://www.readbyqxmd.com/read/29199329/-effect-of-a-non-thermal-atmospheric-pressure-argon-plasma-jet-on-sod-and-mda-levels-in-oral-mucosal-ulcer-of-golden-hamsters
#7
Li Zheng, Ming-Sheng Chen, Lu Wang
PURPOSE:To observe the effects of a non-thermal atmospheric pressure argon plasma jet on the healing time, and the levels of superoxide dismutase(SOD)and malondialdehyde(MDA)in oral mucosal ulcer of golden hamsters.METHODS: 56 golden hamsters were randomly assigned to 8 groups, one normal control group, one ulcer group, one natural healing group without any therapy, one iodine glycerin group, two argon groups (30 s, 120 s)and two plasma groups (30 s, 120 s).24 hours after the last treatment, 4 hamsters from each group were sacrificed to detect SOD and MDA levels in the oral mucosal ulcer by spectrophotometry...
August 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/29195996/evaluation-of-tempranillo-and-albari%C3%A3-o-so2-free-wines-produced-by-different-chemical-alternatives-and-winemaking-procedures
#8
Raúl Ferrer-Gallego, Miquel Puxeu, Enric Nart, Laura Martín, Imma Andorrà
In this work physical and chemical alternatives to produce SO2 free wines are shown. The use of inactive yeast strains enriched in glutathione, chitosan, dimethyldicarbonate and different hydrolysable and condensed tannins were assessed in Tempranillo and Albariño wines. The time of addition, mixtures of additives and the use of inert gases were evaluated. In general, no significant differences on the sensory quality were shown when compared sulphited and non-sulphited wines. Both physical and chemical treatments were more effective for Tempranillo wines...
December 2017: Food Research International
https://www.readbyqxmd.com/read/29195414/a-high-precision-flat-crystal-spectrometer-compatible-for-ultra-high-vacuum-light-source
#9
Y Yang, J Xiao, D Lu, Y Shen, K Yao, C Chen, R Hutton, Y Zou
We report on a flat crystal spectrometer (FCS) featuring a differently pumped rotary feedthrough and double detectors connected to a crystal chamber by extendable bellows built at the Shanghai EBIT Laboratory. It was designed to overcome defects such as oil contamination, little distance from the detector to the crystal and others of an early FCS equipped at the same laboratory, but still keeps a large detectable angle range of detectors and brings new features and functions such as the Bond method measurement and double-crystal measurement which are based on the two-detector and large bellow design...
November 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29194069/changing-patterns-in-treatment-of-angle-closure-glaucoma
#10
Maria L Napier, Augusto Azuara-Blanco
PURPOSE OF REVIEW: Angle closure glaucoma is a leading cause of blindness globally and trends of how best to treat this disease are evolving. The advent of anterior segment imaging aids our understanding of pathogenesis and allows more robust and objective measurement of treatment modalities. We will also review recent literature regarding the role of laser and surgical interventions for the treatment of primary angle closure disease. RECENT FINDINGS: Recent studies evaluating the efficacy of laser peripheral iridotomy (LPI) in primary angle closure suspects (PACs) show that while it is a safe intervention and initially anterior chamber angle widens following the laser treatment, the effect is lost with time...
November 30, 2017: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/29185461/data-driven-inference-for-the-repulsive-exponent-of-the-lennard-jones-potential-in-molecular-dynamics-simulations
#11
Lina Kulakova, Georgios Arampatzis, Panagiotis Angelikopoulos, Panagiotis Hadjidoukas, Costas Papadimitriou, Petros Koumoutsakos
The Lennard-Jones (LJ) potential is a cornerstone of Molecular Dynamics (MD) simulations and among the most widely used computational kernels in science. The LJ potential models atomistic attraction and repulsion with century old prescribed parameters (q = 6, p = 12, respectively), originally related by a factor of two for simplicity of calculations. We propose the inference of the repulsion exponent through Hierarchical Bayesian uncertainty quantification We use experimental data of the radial distribution function and dimer interaction energies from quantum mechanics simulations...
November 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29184152/pressure-driven-spin-transition-in-siderite-and-magnesiosiderite-single-crystals
#12
Christopher Weis, Christian Sternemann, Valerio Cerantola, Christoph J Sahle, Georg Spiekermann, Manuel Harder, Yury Forov, Alexander Kononov, Robin Sakrowski, Hasan Yavaş, Metin Tolan, Max Wilke
Iron-bearing carbonates are candidate phases for carbon storage in the deep Earth and may play an important role for the Earth's carbon cycle. To elucidate the properties of carbonates at conditions of the deep Earth, we investigated the pressure driven magnetic high spin to low spin transition of synthetic siderite FeCO3 and magnesiosiderite (Mg0.74Fe0.26)CO3 single crystals for pressures up to 57 GPa using diamond anvil cells and x-ray Raman scattering spectroscopy to directly probe the iron 3d electron configuration...
November 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29184113/a-flexible-plasma-treated-silver-nanowire-electrode-for-organic-light-emitting-devices
#13
Jun Li, Ye Tao, Shufen Chen, Huiying Li, Ping Chen, Meng-Zhu Wei, Hu Wang, Kun Li, Marco Mazzeo, Yu Duan
Silver nanowires (AgNWs) are a promising candidate to replace indium tin oxide (ITO) as transparent electrode material. However, the loose contact at the junction of the AgNWs and residual surfactant polyvinylpyrrolidone (PVP) increase the sheet resistance of the AgNWs. In this paper, an argon (Ar) plasma treatment method is applied to pristine AgNWs to remove the PVP layer and enhance the contact between AgNWs. By adjusting the processing time, we obtained AgNWs with a sheet resistance of 7.2Ω/□ and a transmittance of 78% at 550 nm...
November 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29183130/a-theoretical-study-of-hf-c-h3cl-and-hf-2-ch3cl-complexes
#14
Mohammad Esmail Alikhani, Laurent Manceron
The equilibrium geometries, relative stabilities and vibrational properties (frequencies and intensities) of the HF-CH3Cl (1:1) and (HF)2-CH3Cl (1:2) complexes have been reinvestigated at the MP2/Aug-cc-pVTZ level. The results are discussed in light of the results obtained in solid argon matrices by L. Andrews and coworkers and related to the bonding analysis. The stability and cooperative effects in the hydrogen bonding of the (HF)2-CH3Cl complex in its cyclic form are outlined.
November 28, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29183120/spectroscopic-investigation-of-the-primary-reaction-intermediates-in-the-oxidation-of-levitated-droplets-of-energetic-ionic-liquids
#15
Stephen James Brotton, Michael Lucas, Steven D Chambreau, Ghanshyam L Vaghjiani, Jiang Yu, Scott L Anderson, Ralf I Kaiser
The production of the next generation of hypergolic, ionic-liquid based fuels requires an understanding of the reaction mechanisms between the ionic liquid and oxidizer. We probed reactions between a levitated droplet of 1-methyl-4-amino-1,2,4-triazolium dicyanamide ([MAT][DCA]), with and without hydrogen-capped boron nanoparticles, and the nitrogen dioxide (NO2) oxidizer. The apparatus exploits an ultrasonic levitator enclosed within a pressure-compatible process chamber equipped with complimentary Raman, UV-visible, and Fourier transform infrared (FTIR) spectroscopic probes...
November 28, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29182523/graphene-oxide-reduction-by-solid-state-laser-irradiation-for-bolometric-applications
#16
Vladislav Kondrashov, Nikolay Struchkov, Roman Rozanov, Vladimir Nevolin, Daria S Kopylova, Albert Nasibulin
We present a method for reduced graphene oxide patterning on the surface of graphene oxide film by 445 nm solid-state laser with the adjustable fluence from 0.2 to 20 kJ/cm<sup>2</sup>. We found that the optimal argon concentration in the air to obtain good quality reduced graphene oxide films was 90%. Varying the laser irradiation energy density allowed us to control the resistance and I<sub>G</sub>/I<sub>D</sub> and I<sub>G</sub>/I<sub>2D</sub> ratios of Raman peak intensities...
November 28, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29181746/severe-dehiscence-of-gastrojejunal-anastomosis-after-gastric-bypass-its-cure-by-using-partially-covered-stent-and-avoiding-migration
#17
Helga C A W Alhinho, Flávio C Ferreira, Rodrigo C L Medeiros, Álvaro A B Ferraz, Josemberg M Campos
BACKGROUND: Gastric leak is a severe complication of gastric bypass that is associated with significant morbidity and mortality. Anastomosis dehiscence usually occurs at gastrojejunal anastomosis and can appear simultaneously with gastric leak, for which treatment can be a challenge. Fistula may have several clinical impacts, depending on patient-related factors, fistula characteristics, onset time, and therapy proposal. Abdominal toilet, drainage, gastrostomy, and revisional surgery constitute the traditional approaches to dehiscence and fistula closure, with variable results...
November 27, 2017: Obesity Surgery
https://www.readbyqxmd.com/read/29178715/effects-of-atmospheric-non-thermal-argon-oxygen-plasma-on-biofilm-viability-and-hydrophobicity-of-oral-bacteria
#18
Tianshuang Liu, Linfeng Wu, Jegdish P Babu, Timothy L Hottel, Franklin Garcia-Godoy, Liang Hong
PURPOSE: To evaluate the bactericidal effects of atmospheric non-thermal argon/oxygen plasma on in vitro oral biofilms constructed from S. mutans and/or S. sanguinis, and the influence of the plasma on the virulence properties of A. oris. METHODS: In vitro oral biofilms were constructed in the wells of 48-well plates from S. mutans and/or S. sanguinis. The wells containing constructed biofilms and various amounts of phosphate-buffered saline (PBS) were treated with non-thermal argon/oxygen plasma brush for 2 minutes...
February 2017: American Journal of Dentistry
https://www.readbyqxmd.com/read/29169661/light-irradiance-through-novel-cad-cam-block-materials-and-degree-of-conversion-of-composite-cements
#19
Diogo Pedrollo Lise, Annelies Van Ende, Jan De Munck, Kumiko Yoshihara, Noriyuki Nagaoka, Luiz Clovis Cardoso Vieira, Bart Van Meerbeek
OBJECTIVE: To assess light irradiance (LI) delivered by two light-curing units (LCU's) and to measure the degree of conversion (DC) of three composite cements, when cured through different thicknesses of two novel CAD-CAM block materials. METHODS: 100-μm-thick films of a dual-curable composite cement (G-CEM LinkAce, GC), a light-curable flowable resin-based composite (RBC) (G-ænial Universal Flo, GC) and a micro-hybrid RBC (G-ænial Posterior, GC) were investigated as luting agents...
November 20, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29168776/enhancement-of-osteoblastic-like-cell-activity-by-glow-discharge-plasma-surface-modified-hydroxyapatite-%C3%AE-tricalcium-phosphate-bone-substitute
#20
Eisner Salamanca, Yu-Hwa Pan, Aileen I Tsai, Pei-Ying Lin, Ching-Kai Lin, Haw-Ming Huang, Nai-Chia Teng, Peter D Wang, Wei-Jen Chang
Glow discharge plasma (GDP) treatments of biomaterials, such as hydroxyapatite/β-tricalcium phosphate (HA/β-TCP) composites, produce surfaces with fewer contaminants and may facilitate cell attachment and enhance bone regeneration. Thus, in this study we used argon glow discharge plasma (Ar-GDP) treatments to modify HA/β-TCP particle surfaces and investigated the physical and chemical properties of the resulting particles (HA/β-TCP + Ar-GDP). The HA/β-TCP particles were treated with GDP for 15 min in argon gas at room temperature under the following conditions: power: 80 W; frequency: 13...
November 23, 2017: Materials
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