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https://www.readbyqxmd.com/read/28107715/metabolical-shifts-towards-alternative-btex-biodegradation-intermediates-induced-by-perfluorinated-compounds-in-firefighting-foams
#1
Renato Nallin Montagnolli, Paulo Renato Matos Lopes, Jaqueline Matos Cruz, Marina Turini Claro, Gabriela Mercuri Quiterio, Ederio Dino Bidoia
The type and concentration of perfluorinated compounds (PFCs) can induce different types of enzymes and promote alternate patterns of BTEX transformation. However, it is not known how the presence of active fluorocarbon-degrading microbial populations affects the transformation of BTEX. In addition to chemical analysis at the molecular level, our research approached the aqueous film forming fire-fighting foams (AFFF) and BTEX co-contamination at a large-scale with respirometers to quantify the total microbial metabolism of soil via CO2 output levels...
December 30, 2016: Chemosphere
https://www.readbyqxmd.com/read/28107709/quantification-of-fatty-acids-in-the-muscle-of-antarctic-fish-trematomus-bernacchii-by-gas-chromatography-mass-spectrometry-optimization-of-the-analytical-methodology
#2
C Truzzi, S Illuminati, A Annibaldi, M Antonucci, G Scarponi
This work presents data on the quantification of fatty acids (FAs, in terms of mass unit per tissue weight) in the muscle of Trematomus bernacchii, a key species in Antarctica, often used as bioindicator for contamination studies. Modifications in fatty acids content should be considered a useful biomarker to study how contaminants affect Antarctic biota. Until now, very few studies quantified fatty acids of muscle of T. bernacchii, and only as percentage of a single fatty acid on total lipids. To perform the quantification of fatty acids, we used an analytical method based on a fast microwave-assisted extraction of lipids from a lyophilized sample, a base-catalyzed trans-esterification of lipid extract to obtain Fatty Acids Methyl Esters (FAMEs), and a separation and identification of FAMEs by gas chromatography-mass spectrometry...
December 31, 2016: Chemosphere
https://www.readbyqxmd.com/read/28107308/acute-right-heart-failure-after-hemorrhagic-shock-and-trauma-pneumonectomy-a-management-approach-a-blinded-randomized-controlled-animal-trial-using-inhaled-nitric-oxide
#3
Andrea L Lubitz, Lars O Sjoholm, Amy Goldberg, Abhijit Pathak, Thomas Santora, Thomas E Sharp, Markus Wallner, Remus M Berretta, Lauren A Poole, Jichuan Wu, Marla R Wolfson
BACKGROUND: Hemorrhagic shock and pneumonectomy causes an acute increase in pulmonary vascular resistance (PVR). The increase in PVR and right ventricular (RV) afterload leads to acute RV failure, thus reducing left ventricular (LV) preload and output. Inhaled nitric oxide (iNO) lowers PVR by relaxing pulmonary arterial smooth muscle without remarkable systemic vascular effects. We hypothesized that with hemorrhagic shock and pneumonectomy, iNO can be used to decrease PVR and mitigate right heart failure...
February 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28107119/olfaction-new-understandings-diagnostic-applications
#4
Gabrielle F Ruggiero, Jeannette Y Wick
Estimates indicate that 14 million Americans have olfactory dysfunction. As with other senses, such as sight and hearing, olfaction frequently declines with age. Impaired olfaction can be a warning sign of Parkinson's disease, sometimes occurring before motor symptoms develop. It's also an initial symptom of Alzheimer's dementia (AD); the amyloid plaques and tangles characterizing AD invade the olfactory bulb and hippocampus early in its course, hampering odor identification. Olfactory dysfunction is associated with some serious problems, including inability to smell warning odors (fire, gas) and impaired ability to taste food...
November 1, 2016: Consultant Pharmacist: the Journal of the American Society of Consultant Pharmacists
https://www.readbyqxmd.com/read/28107087/comparison-of-fatty-acid-composition-in-selected-dietary-supplements-containing-conjugated-linoleic-acid
#5
Dorota Derewiaka, Klara Nestorowicz, Rafał Wołosiak
The market of pharmaceutical products is offering a wide range of supplements. Most of the consumers believe that these products will improve their state of health, but are they getting what they want and what they are paying for? The aim of the study was to evaluate the quality of selected dietary supplements containing conjugated linoleic acid (CLA). All supplements were available in the Warsaw markets and bought from pharmacies. Assessment of the quality of food supplements was achieved by analysis of fatty acid using gas chromatography coupled with a mass spectrometer...
January 20, 2017: Journal of Dietary Supplements
https://www.readbyqxmd.com/read/28107080/the-influence-of-a-combined-butorphanol-and-midazolam-premedication-on-anesthesia-in-psittacid-species
#6
Marie Kubiak, Louise Roach, Kevin Eatwell
Premedication is considered routine for domestic animal and human anesthesia but is rarely applied to avian patients, and few controlled studies exist to document effects of premedication in avian species. To determine the effects of a butorphanol and midazolam premedication on general anesthesia and quality of induction and recovery phases in psittacid species, 17 clinically healthy birds undergoing anesthesia were randomly allocated into either a premedicated or control group. Anesthetic parameters were subsequently compared...
December 2016: Journal of Avian Medicine and Surgery
https://www.readbyqxmd.com/read/28106988/factors-governing-the-performance-of-bauxite-for-fluoride-remediation-of-groundwater
#7
Aruna Kirani Katyayani Cherukumilli, Caroline Delaire, Susan E Amrose, Ashok J Gadgil
Globally, 200 million people drink groundwater contaminated with fluoride concentrations exceeding the World Health Organization's recommended level (WHO-MCL =1.5 mg F-/L). This study investigates the use of minimally-processed (dried/milled) bauxite ore as an inexpensive adsorbent for remediating fluoride-contaminated groundwater in resource-constrained areas. Adsorption experiments in synthetic groundwater using bauxites from Guinea, Ghana, USA, and India as single-use batch dispersive media demonstrated that doses of ~10-23 g/L could effectively remediate 10 mg F-/L...
January 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28106984/pore-space-partition-in-metal-organic-frameworks
#8
Quan-Guo Zhai, Xianhui Bu, Xiang Zhao, Dong-Sheng Li, Pingyun Feng
Metal-organic framework (MOF) materials have emerged as one of the favorite crystalline porous materials (CPM) because of their compositional and geometric tunability and many possible applications. In efforts to develop better MOFs for gas storage and separation, a number of strategies including creation of open metal sites and implantation of Lewis base sites have been used to tune host-guest interactions. In addition to these chemical factors, the geometric features such as pore size and shape, surface area, and pore volume also play important roles in sorption energetics and uptake capacity...
January 20, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28106932/metal-co2-batteries-on-the-road-co2-from-contamination-gas-to-energy-source
#9
REVIEW
Zhaojun Xie, Xin Zhang, Zhang Zhang, Zhen Zhou
Rechargeable nonaqueous metal-air batteries attract much attention for their high theoretical energy density, especially in the last decade. However, most reported metal-air batteries are actually operated in a pure O2 atmosphere, while CO2 and moisture in ambient air can significantly impact the electrochemical performance of metal-O2 batteries. In the study of CO2 contamination on metal-O2 batteries, it has been gradually found that CO2 can be utilized as the reactant gas alone; namely, metal-CO2 batteries can work...
January 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28106857/a-liquid-level-measurement-technique-outside-a-sealed-metal-container-based-on-ultrasonic-impedance-and-echo-energy
#10
Bin Zhang, Yue-Juan Wei, Wen-Yi Liu, Yan-Jun Zhang, Zong Yao, Li-Hui Zhao, Ji-Jun Xiong
The proposed method for measuring the liquid level focuses on the ultrasonic impedance and echo energy inside a metal wall, to which the sensor is attached directly, not on ultrasonic waves that penetrate the gas-liquid medium of a container. Firstly, by analyzing the sound field distribution characteristics of the sensor in a metal wall, this paper proposes the concept of an "energy circle" and discusses how to calculate echo energy under three different states in detail. Meanwhile, an ultrasonic transmitting and receiving circuit is designed to convert the echo energy inside the energy circle into its equivalent electric power...
January 19, 2017: Sensors
https://www.readbyqxmd.com/read/28106806/uhf-signal-processing-and-pattern-recognition-of-partial-discharge-in-gas-insulated-switchgear-using-chromatic-methodology
#11
Xiaohua Wang, Xi Li, Mingzhe Rong, Dingli Xie, Dan Ding, Zhixiang Wang
The ultra-high frequency (UHF) method is widely used in insulation condition assessment. However, UHF signal processing algorithms are complicated and the size of the result is large, which hinders extracting features and recognizing partial discharge (PD) patterns. This article investigated the chromatic methodology that is novel in PD detection. The principle of chromatic methodologies in color science are introduced. The chromatic processing represents UHF signals sparsely. The UHF signals obtained from PD experiments were processed using chromatic methodology and characterized by three parameters in chromatic space (H, L, and S representing dominant wavelength, signal strength, and saturation, respectively)...
January 18, 2017: Sensors
https://www.readbyqxmd.com/read/28106773/determinants-of-serum-glycerophospholipid-fatty-acids-in-cystic-fibrosis
#12
Sławomira Drzymała-Czyż, Patrycja Krzyżanowska, Berthold Koletzko, Jan Nowak, Anna Miśkiewicz-Chotnicka, Jerzy A Moczko, Aleksandra Lisowska, Jarosław Walkowiak
The etiology of altered blood fatty acid (FA) composition in cystic fibrosis (CF) is understood only partially. We aimed to investigate the determinants of serum glycerophospholipids' FAs in CF with regard to the highest number of FAs and in the largest cohort to date. The study comprised 172 CF patients and 30 healthy subjects (HS). We assessed Fas' profile (gas chromatography/mass spectrometry), CF transmembrane conductance regulator (CFTR) genotype, spirometry, fecal elastase-1, body height and weight Z-scores, liver disease, diabetes and colonization by Pseudomonas aeruginosa...
January 18, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28106748/two-dimensional-numerical-simulations-of-ultrasound-in-liquids-with-gas-bubble-agglomerates-examples-of-bubbly-liquid-type-acoustic-metamaterials-blamms
#13
Christian Vanhille
This work deals with a theoretical analysis about the possibility of using linear and nonlinear acoustic properties to modify ultrasound by adding gas bubbles of determined sizes in a liquid. We use a two-dimensional numerical model to evaluate the effect that one and several monodisperse bubble populations confined in restricted areas of a liquid have on ultrasound by calculating their nonlinear interaction. The filtering of an input ultrasonic pulse performed by a net of bubbly-liquid cells is analyzed. The generation of a low-frequency component from a single cell impinged by a two-frequency harmonic wave is also studied...
January 17, 2017: Sensors
https://www.readbyqxmd.com/read/28106534/extrinsic-rashba-spin-orbit-coupling-effect-on-silicene-spin-polarized-field-effect-transistors
#14
Nezhat Pournaghavi, Mahdi Esmaeilzadeh, Adib Abrishamifar, Somaieh Ahmadi
Regarding the spin field effect transistor (spin FET) challenges such as mismatch effect in spin injection and insufficient spin life time, we propose a silicene based device which can be a promising candidate to overcome some of those problems. Using non-equilibrium Green���s function method, we investigate the spin-dependent conductance in a zigzag silicene nanoribbon connected to two magnetized leads which are supposed to be either in parallel or anti-parallel configurations. For both configurations, a controllable spin current can be obtained when the Rashba effect is present; thus, we can have a spin filter device...
January 20, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28106443/bose-einstein-condensation-of-long-lifetime-polaritons-in-thermal-equilibrium
#15
Yongbao Sun, Patrick Wen, Yoseob Yoon, Gangqiang Liu, Mark Steger, Loren N Pfeiffer, Ken West, David W Snoke, Keith A Nelson
The experimental realization of Bose-Einstein condensation (BEC) with atoms and quasiparticles has triggered wide exploration of macroscopic quantum effects. Microcavity polaritons are of particular interest because quantum phenomena such as BEC and superfluidity can be observed at elevated temperatures. However, polariton lifetimes are typically too short to permit thermal equilibration. This has led to debate about whether polariton condensation is intrinsically a nonequilibrium effect. Here we report the first unambiguous observation of BEC of optically trapped polaritons in thermal equilibrium in a high-Q microcavity, evidenced by equilibrium Bose-Einstein distributions over broad ranges of polariton densities and bath temperatures...
January 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28106412/time-dependent-fluctuations-and-superdiffusivity-in-the-driven-lattice-lorentz-gas
#16
Sebastian Leitmann, Thomas Franosch
We consider a tracer particle on a lattice in the presence of immobile obstacles. Starting from equilibrium, a force pulling on the particle is switched on, driving the system to a new stationary state. We solve for the complete transient dynamics of the fluctuations of the tracer position along the direction of the force. The analytic result, exact in first order of the obstacle density and for arbitrarily strong driving, is compared to stochastic simulations. Upon strong driving, the fluctuations grow superdiffusively for intermediate times; however, they always become diffusive in the stationary state...
January 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28106407/matter-wave-optical-wave-mixing-induced-transparency-and-a-nonhyperbolic-matter-wave-quasisoliton-in-quantum-gases
#17
Yan Li, Chengjie Zhu, W R Garrett, E W Hagley, L Deng
The realization of atomic quantum gases has brought out surprising effects that have no correspondence in nonlinear optics with thermal gases, presenting intriguing and exciting challenges to the research discipline of nonlinear optics which has matured since the invention of the laser. Here, we show an unexpected optical wave-mixing gain cancellation effect in a quantum gas that restricts an, otherwise, strongly enhanced backward-propagating light-matter wave-mixing process. This results in a wave-mixing induced transparency and a nonhyperbolic quasi-matter-wave soliton that opens new research opportunities in hydrodynamic fluid research of degenerate quantum gases, such as phonon scattering in a two-dimensional sonic black hole horizon...
January 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28106374/extremely-high-barrier-performance-of-organic-inorganic-nanolaminated-thin-films-for-organic-light-emitting-diodes
#18
Kwan Hyuck Yoon, Harrison Sejoon Kim, Kyu Seok Han, Seung Hun Kim, Yong-Eun Koo Lee, Nabeen K Shrestha, Seung Yong Song, Myung Mo Sung
This work presents a novel barrier thin film based on an organic-inorganic nanolaminate, which consists of alternating nanolayers of self-assembled organic layers (SAOLs) and Al2O3. The SAOLs-Al2O3 nanolaminated films were deposited using a combination of molecular layer deposition and atomic layer deposition techniques at 80 °C. Modulation of the relative thickness ratio of the SAOLs and Al2O3 enabled control over the elastic modulus and stress in the films. Furthermore, the SAOLs-Al2O3 thin film achieved a high degree of mechanical flexibility, excellent transmittance (> 95%), and an ultra-low water-vapor transmission rate (2...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28106340/gas-chromatography-with-mass-spectrometry-for-the-determination-of-phthalates-preconcentrated-by-microextraction-based-on-an-ionic-liquid
#19
Juan Ignacio Cacho, Natalia Campillo, Pilar Viñas, Manuel Hernández-Córdoba
A new procedure is proposed for the analysis of migration test solutions obtained from plastic bottles used in the packaging of edible oils. Ultrasound assisted emulsification microextraction with ionic liquids was applied for the preconcentration of six phthalate esters: dimethyl-, diethyl-, di-n-butyl, n-butylbenzyl, di-2-ethylhexyl and di-n-octylphthalate. The enriched ionic liquid was directly analyzed by gas chromatography and mass spectrometry using direct insert microvial thermal desorption. The different factors affecting the microextraction efficiency, like volume of the extracting phase (30 μL of the ionic liquid) and ultrasounds application time (25 s); and the thermal desorption step, such as desorption temperature and time, and gas flow rate, were studied...
January 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28106327/evaluation-of-the-matrix-like-effect-in-multiresidue-pesticide-analysis-by-gas-chromatography-with-tandem-mass-spectrometry
#20
Kazuhiko Akutsu, Masato Yoshimitsu, Yoko Kitagawa, Satoshi Takatori, Naoki Fukui, Masakazu Osakada, Satoko Yamaguchi, Keiji Kajimura, Hirotaka Obana, Takaho Watanabe
In multiresidue pesticide analysis using gas chromatography, it has long been recognized that an increase in the number of pesticides present in a standard solution can result in an enhancement of the peak responses of certain pesticides. Despite being widely acknowledged, this phenomenon has been rarely studied and is poorly understood. In this study, the authors have tentatively called this phenomenon the "matrix-like effect" and demonstrated it clearly using gas chromatography with tandem mass spectrometry...
January 20, 2017: Journal of Separation Science
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