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https://www.readbyqxmd.com/read/29334454/aurophilic-interactions-in-l-au-x-%C3%A2-l-au-x-dimers-calibration-by-experiment-and-theory
#1
Erik Andris, Prokopis Andrikopoulos, Jiří Schulz, Jan Turek, Aleš Růžička, Jana Roithová, Lubomír Rulíšek
Attractive metallophilic (aurophilic, argentophilic, cuprophilic, …) interactions play an important role in arrangement and stabilization of oligonuclear metal ion complexes. We report a combined experimental and theoretical assessment of aurophilic interactions in closed-shell gold(I) dimers. The experimental binding energies were obtained for charged [(LH)AuCl]+…[(L')AuCl] dimers (L is either a phosphine or a N-heterocyclic carbene ligand) in the gas phase. These energies served for benchmarking of correlated quantum chemical calculations (CCSD(T)-calibrated SCS-MP2/CBS method) that were then applied to neutral [(L)AuX]…[(L')AuX] dimers (X = Cl, Br, I)...
January 15, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29334361/engineering-the-spin-polarization-of-one-dimensional-electrons
#2
Chengyu Yan, Sanjeev Kumar, Kalarikad Thomas, Patrick See, Ian Farrer, David A Ritchie, John Griffiths, G A C Jones, Michael Pepper
We present results of magneto-focusing on the controlled monitoring of spin polarization within a one-dimensional (1D) channel, and its subsequent effect on modulating the spin-orbit interaction (SOI) in a 2D GaAs electron gas. We demonstrate that electrons within a 1D channel can be partially spin polarized as the effective length of the 1D channel is varied in agreement with the theoretical prediction. Such polarized 1D electrons when injected into a 2D region result in a split in the odd-focusing peaks, whereas the even peaks remain unaffected (single peak)...
January 15, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29334335/simultaneous-formation-of-polycyclic-aromatic-hydrocarbons-pahs-and-heterocyclic-aromatic-amines-hcas-in-gas-grilled-beef-satay-at-different-temperatures
#3
A K Nor Hasyimah, S Jinap, M Sanny
This study investigated the simultaneous formation of polycyclic aromatic hydrocarbons (PAHs) and heterocyclic aromatic amines (HCAs) in gas-grilled beef satay at different temperatures (150°C, 200°C, 250°C, 300°C, and 350°C). Solid-phase extraction (SPE) was used for sample clean-up. Fifteen PAHs were determined using high performance liquid chromatography with fluorescence detection (HPLC-FLD) and nine HCAs were quantified using liquid chromatography tandem-mass spectrometry (LC-MS/MS) with a gradient programme...
January 15, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/29334019/chemical-stabilization-of-polymers-implications-for-dermal-exposure-to-additives
#4
N Bartsch, M Girard, L Schneider, V Van De Weijgert, A Wilde, O Kappenstein, B Vieth, C Hutzler, A Luch
Technical benefits of additives in polymers stand in marked contrast to their associated health risks. Here, a multi-analyte method based on gas chromatography coupled to tandem mass spectrometry (GC-MS/MS) was developed to quantify polymer additives in complex matrices such as low-density polyethylene (LDPE) and isolated human skin layers after dermal exposure ex vivo. That way both technical aspects and dermal exposure were investigated. The effects of polymer additivation on the material were studied using the example of LDPE...
January 15, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29333991/evaluation-of-a-portable-gas-chromatograph-with-photoionization-detector-under-variations-of-voc-concentration-temperature-and-relative-humidity
#5
Jhy-Charm Soo, Eun Gyung Lee, Ryan F LeBouf, Michael L Kashon, William Chisholm, Martin Harper
The objective of this present study was to evaluate the performance of a portable gas chromatograph ─ photoionization detector (GC-PID), under various test conditions to determine if it could be used in occupational settings. A mixture of seven volatile organic compounds (VOCs) - acetone, ethylbenzene, methyl isobutyl ketone, toluene, m-xylene, p-xylene, and o-xylene - was selected because its components are commonly present in paint manufacturing industries. A full-factorial combination of four concentration levels (exposure scenarios) of VOC mixtures, three different temperatures (25˚C, 30˚C, and 35˚C), and three relative humidities (RHs; 25%, 50%, and 75%) was conducted in a full- size controlled environmental chamber...
January 15, 2018: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29333956/high-efficiency-treatment-of-pta-wastewater-using-a-biogas-jet-assisted-anaerobic-fluidized-bed-reactor
#6
Wei Zhang, Yangyang Feng, Yingwen Chen, Peiwen Li, Shemin Zhu, Shubao Shen
In this paper, a new type of biogas jet assisted anaerobic fluidized bed reactor loaded with a polypropylene (PP) carrier, has been proposed. There was a clear improvement in the fluidized state due to the biogas assisted input when the gas/water ratio was set at 1:3 with a suitable carrier loading of 60%. When the circulating water flow is 30 L/min assisted with biogas 10 L/min, the mixing time shortens from 26 s to 18 s. The performance of anaerobic biodegradation on wastewater treatment was improved largely...
January 15, 2018: Environmental Technology
https://www.readbyqxmd.com/read/29333927/comprehensive-characterization-of-hydrothermal-liquefaction-products-obtained-from-woody-biomass-under-various-alkali-catalyst-concentrations
#7
Hyewon Hwang, Jae Hoon Lee, In Gyu Choi, Joon Weon Choi
Hydrothermal liquefaction (HTL) of lignocellulosic biomass has been widely investigated for the production of renewable and alternative bio-crude oil. In this study, catalytic hydrothermal processing of two biomasses (larch and Mongolian oak) was performed using different K2CO3 concentrations (0, 0.1, 0.5, 1.0wt% of solvent) to improve fuel yield and properties. HTL oil, hydrochar, water soluble fraction (WSF) and gas were characterized and carbon balance was investigated. As a result, the maximum yield of HTL oil, 27...
January 15, 2018: Environmental Technology
https://www.readbyqxmd.com/read/29333891/therapeutic-potential-of-zataria-multiflora-boiss-in-treatment-of-irritable-bowel-syndrome-ibs
#8
Mohaddese Mahboubi
Irritable Bowel syndrome (IBS), the most common chronic functional gastrointestinal disorder, is categorized as IBS-C and IBS-D, which are equivalent to Ghoolenj Rihi and Maghs Rihi in Iranian traditional medicine. One of the main applications of Zataria multiflora Boiss in traditional medicine is its efficacy in the gastrointestinal tract with symptoms such as IBS. The aim of this study was to evaluate the efficacy of Zataria multiflora essential oil in management of IBS. We used all the accessible references (electronic and published books, theses, and reports) to write this article...
January 15, 2018: Journal of Dietary Supplements
https://www.readbyqxmd.com/read/29333684/biocatalytic-synthesis-of-nitriles-through-dehydration-of-aldoximes-the-substrate-scope-of-aldoxime-dehydratases
#9
Tobias Betke, Jun Higuchi, Philipp Rommelmann, Keiko Oike, Taiji Nomura, Yasuo Kato, Yasuhisa Asano, Harald Gröger
Nitriles belong to the product classes, which are mostly needed and produced by the chemical industry, playing a major role in various industry segments ranging from high-volume low-price sectors such as polymers to low-volume high-price sectors such as the chiral pharma drugs. A common industrial technology for nitrile production is ammonoxidation as a gas phase reaction at high temperature. A further popular approach are substitution or addition reactions with hydrogen cyanide or derivatives thereof. A major drawback, however, is the very high toxicity of cyanide...
January 14, 2018: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/29333042/gas-chromatography-mass-spectrometry-profiling-in-methanolic-and-ethyl-acetate-root-and-stem-extract-of-corbichonia-decumbens-forssk-exell-from-thar-desert-of-rajasthan-india
#10
Sunita Arora, Manju Saini
Background: Corbichonia decumbens (Forssk.) Exell (Molluginaceae), recently has moved to Lophiocarpaceae as per angiospermic plant group (APG) III system, is an annual or short-lived, dwarf, glabrous subshrub, prefers to grow on rocky places and on sand-stones in dry, hot areas of Rajasthan. This is the potential plant with medicinal properties. Vegetative organs under study show antioxidant, anti-inflammatory, antiulcer, antimicrobial, and antinociception activity. Objective: This study was carried out to identify the phytoconstituents present in the methanolic and ethyl-acetate extract of root and stem of C...
December 2017: Pharmacognosy Research
https://www.readbyqxmd.com/read/29332969/c12h12-interconversions-two-non-pyrolytic-syntheses-of-tricyclo-5-3-2-04-8-dodeca-2-5-9-11-tetraene
#11
Ihsan Erden, Cindy J Gleason
Herein, we describe two independent and non-pyrolytic syntheses of an important C12H12 hydrocarbon which had been prepared previously by gas phase thermolysis of compound 6. The first method is based on an unusual dipolar cycloaddition of dichloroketene onto bullvalene. After reductive dechlorination, a Shapiro-Heath reaction of the tosylhydrazone gave the title compound. Alternatively, compound 13 is also obtained from its isomer 6 by a Ag+ catalyzed reaction.
January 17, 2018: Tetrahedron Letters
https://www.readbyqxmd.com/read/29332954/determination-of-the-boltzmann-constant-with-cylindrical-acoustic-gas-thermometry-new-and-previous-results-combined
#12
X J Feng, J T Zhang, H Lin, K A Gillis, J B Mehl, M R Moldover, K Zhang, Y N Duan
We report a new determination of the Boltzmann constant kB using a cylindrical acoustic gas thermometer. We determined the length of the copper cavity from measurements of its microwave resonance frequencies. This contrasts with our previous work (Zhang et al 2011 Int. J. Thermophys.32 1297, Lin et al 2013 Metrologia50 417, Feng et al 2015 Metrologia52 S343) that determined the length of a different cavity using two-color optical interferometry. In this new study, the half-widths of the acoustic resonances are closer to their theoretical values than in our previous work...
October 2017: Metrologia
https://www.readbyqxmd.com/read/29332953/determination-of-the-molar-mass-of-argon-from-high-precision-acoustic-comparisons
#13
X J Feng, J T Zhang, M R Moldover, I Yang, M D Plimmer, H Lin
This article describes the accurate determination of the molar mass M of a sample of argon gas used for the determination of the Boltzmann constant. The method of one of the authors (Moldover et al 1988 J. Res. Natl. Bur. Stand.93 85-144) uses the ratio of the square speed of sound in the gas under analysis and in a reference sample of known molar mass. A sample of argon that was isotopically-enriched in 40Ar was used as the reference, whose unreactive impurities had been independently measured. The results for three gas samples are in good agreement with determinations by gravimetric mass spectrometry; (〈Macoustic/Mmass-spec〉 - 1) = (-0...
June 2017: Metrologia
https://www.readbyqxmd.com/read/29332834/direct-inlet-probe-ion-mobility-spectrometry
#14
Andriy Kuklya, Lokman Coban, Florian Uteschil, Klaus Kerpen, Ursula Telgheder
Direct inlet probe (DIP) was used as an introduction and a pre-separation step for atmospheric pressure photoionization time-of-flight ion mobility spectrometry (APPI-TOF-IMS) for the first time. IMS is an analytical technique used to separate and identify ionized molecules in the gas phase and under atmospheric pressure based on their mobility. The utilization of DIP prior to IMS gives the possibility to introduce the analytes into the gas phase and provides an additional separation based on their vapor pressure...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29332575/protective-role-of-italian-juglans-regia-l-nut-ethanolic-extract-in-human-keratinocytes-under-oxidative-and-inflammatory-stress
#15
Cinzia Calcabrini, Umberto Mancini, Roberta De Bellis, Alessandra Frati, Anna Rita Mastrogiacomo, Giosue Annibalini, Piero Sestili, Luigi Cucchiarini, Vilberto Stocchi, Lucia Potenza
OBJECTIVE: In this research, fatty acid profile and polyphenolic content of an ethanolic extract of walnut from Juglans regia L. collected in Central Italy, were performed. The potential antioxidant and anti-inflammatory effects of the extract were investigated in the human keratinocytes cell line. METHODS: Fatty acid profile was determined by gas chromatography/mass spectrometry analysis, total phenolic content by Folin-Ciocalteu method and aluminum chloride colorimetric method was used for determination of total flavonoids...
January 12, 2018: Current Pharmaceutical Biotechnology
https://www.readbyqxmd.com/read/29331933/combined-effects-of-ag-and-uio-66-for-removal-of-elemental-mercury-from-flue-gas
#16
Songjian Zhao, Dongyao Chen, Haomiao Xu, Jian Mei, Zan Qu, Ping Liu, Yong Cui, Naiqiang Yan
The zirconium metal-organic framework material UiO-66 was doped with Ag nanoparticles and investigated for the removal of elemental mercury (Hg0) in flue gas. Physical and chemical characterization of the adsorbents showed that adding Ag did not change the crystal structure and morphology of the UiO-66. Ag doping can improve the redox activity of UiO-66, and the adsorbent exhibited high thermal stability and surface area. Hg0 removal experiments indicated that UiO-66 exhibited the higher performance compared with P25 and activated carbon, and the addition of Ag exhibited a significant synergistic effect with the UiO-66, which had highest Hg0 adsorption capacity (3...
January 9, 2018: Chemosphere
https://www.readbyqxmd.com/read/29331814/characterization-of-sp3-bond-content-of-carbon-films-deposited-by-high-power-gas-injection-magnetron-sputtering-method-by-uv-and-vis-raman-spectroscopy
#17
Krzysztof Zdunek, Rafał Chodun, Bartosz Wicher, Katarzyna Nowakowska-Langier, Sebastian Okrasa
This paper presents the results of investigations of carbon films deposited by a modified version of the magnetron sputtering method - HiPGIMS (High Power Gas Injection Magnetron Sputtering). In this experiment, the magnetron system with inversely polarized electrodes (sputtered cathode at ground potential and positively biased, spatially separated anode) was used. This arrangement allowed us to conduct the experiment using voltages ranging from 1 to 2kV and a power supply system equipped with 25/50μF capacitor battery...
January 5, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29331811/volatile-organic-compounds-vocs-removal-in-non-thermal-plasma-double-dielectric-barrier-discharge-reactor
#18
Muhammad Farooq Mustafa, Xindi Fu, Yanjun Liu, Yawar Abbas, Hongtao Wang, Wenjing Lu
Non-thermal plasma (NTP) an emerging technology to treat volatile organic compounds (VOCs) present in unhygienic point source air streams. In present study, double dielectric barrier discharge (DDBD) reactors were used for the first time to evaluate the removal efficiency of VOCs mixture of different nature at constant experimental conditions (input power 16-65.8 W, VOCs mixture feeding rate 1-6 L/min, 100-101 ppm inlet concentration of individual VOC). Reactor A and B with discharge gap at 6 mm and 3 mm respectively, were used in current study...
January 9, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29331743/preliminary-investigation-of-human-exhaled-breath-for-tuberculosis-diagnosis-by-multidimensional-gas-chromatography-time-of-flight-mass-spectrometry-and-machine-learning
#19
Marco Beccaria, Theodore R Mellors, Jacky S Petion, Christiaan A Rees, Mavra Nasir, Hannah K Systrom, Jean W Sairistil, Marc-Antoine Jean-Juste, Vanessa Rivera, Kerline Lavoile, Patrice Severe, Jean W Pape, Peter F Wright, Jane E Hill
Tuberculosis (TB) remains a global public health malady that claims almost 1.8 million lives annually. Diagnosis of TB represents perhaps one of the most challenging aspects of tuberculosis control. Gold standards for diagnosis of active TB (culture and nucleic acid amplification) are sputum-dependent, however, in up to a third of TB cases, an adequate biological sputum sample is not readily available. The analysis of exhaled breath, as an alternative to sputum-dependent tests, has the potential to provide a simple, fast, and non-invasive, and ready-available diagnostic service that could positively change TB detection...
January 4, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29331559/experience-of-on-site-disposal-of-production-uranium-graphite-nuclear-reactor
#20
Alexander O Pavliuk, Sergey G Kotlyarevskiy, Evgeny V Bespala, Elena V Zakharova, Vyacheslav M Ermolaev, Anna G Volkova
The paper reported the experience gained in the course of decommissioning EI-2 Production Uranium-Graphite Nuclear Reactor. EI-2 was a production Uranium-Graphite Nuclear Reactor located on the Production and Demonstration Center for Uranium-Graphite Reactors JSC (PDC UGR JSC) site of Seversk City, Tomsk Region, Russia. EI-2 commenced its operation in 1958, and was shut down on December 28, 1990, having operated for the period of 33 years all together. The extra pure grade graphite for the moderator, water for the coolant, and uranium metal for the fuel were used in the reactor...
January 11, 2018: Journal of Environmental Radioactivity
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