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https://www.readbyqxmd.com/read/27911386/a-protocol-for-safe-lithiation-reactions-using-organolithium-reagents
#1
Michael R Gau, Michael J Zdilla
Organolithium reagents are powerful tools in the synthetic chemist's toolbox. However, the extreme pyrophoric nature of the most reactive reagents warrants proper technique, thorough training, and proper personal protective equipment. To aid in the training of researchers using organolithium reagents, a thorough, step-by-step protocol for the safe and effective use of tert-butyllithium on an inert gas line or within a glovebox is described. As a model reaction, preparation of lithium tert-butyl amide by the reaction of tert-butyl amine with one equivalent of tert-butyl lithium is presented...
November 12, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27911003/current-psychotropic-medication-prescribing-patterns-in-late-life-bipolar-disorder
#2
Soham Rej, Nathan Herrmann, Kenneth Shulman, Hadas D Fischer, Kinwah Fung, Andrea Gruneir
OBJECTIVE: Many patients with bipolar disorder are reaching old age, but whether they are receiving evidence-based psychotropic treatment remains unclear. Our objective was to describe current psychotropic prescribing patterns in a large Canadian late-life bipolar sample. METHODS: Population-based cross-sectional study of 1443 bipolar disorder patients aged ≥ 66, discharged from a psychiatric hospitalization in Ontario, Canada from 1 April 2006 to 31 March 2012...
December 2, 2016: International Journal of Geriatric Psychiatry
https://www.readbyqxmd.com/read/27910593/responsivity-calibration-of-the-loweus-spectrometer
#3
J K Lepson, P Beiersdorfer, R Kaita, R Majeski, D Boyle
We performed an in situ calibration of the relative responsivity function of the Long-Wavelength Extreme Ultraviolet Spectrometer (LoWEUS), while operating on the Lithium Tokamak Experiment (LTX) at Princeton Plasma Physics Laboratory. The calibration was accomplished by measuring oxygen lines, which are typically present in LTX plasmas. The measured spectral line intensities of each oxygen charge state were then compared to the calculated emission strengths given in the CHIANTI atomic database. Normalizing the strongest line in each charge state to the CHIANTI predictions, we obtained the differences between the measured and predicted values for the relative strengths of the other lines of a given charge state...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910399/space-and-time-resolved-resistive-measurements-of-liquid-metal-wall-thickness
#4
S M H Mirhoseini, F A Volpe
In a fusion reactor internally coated with liquid metal, it will be important to diagnose the thickness of the liquid at various locations in the vessel, as a function of time, and possibly respond to counteract undesired bulging or depletion. The electrical conductance between electrodes immersed in the liquid metal can be used as a simple proxy for the local thickness. Here a matrix of electrodes is shown to provide spatially and temporally resolved measurements of liquid metal thickness in the absence of plasma...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910357/diagnostics-for-molybdenum-and-tungsten-erosion-and-transport-in-nstx-u
#5
F Scotti, V A Soukhanovskii, M E Weller
A comprehensive set of spectroscopic diagnostics is planned in the National Spherical Torus Experiment Upgrade to connect measurements of molybdenum and tungsten divertor sources to scrape-off layer (SOL) and core impurity transport, supporting the installation of high-Z plasma facing components which is scheduled to begin with a row of molybdenum tiles. Imaging with narrow-bandpass interference filters and high-resolution spectroscopy will be coupled to estimate divertor impurity influxes. Vacuum ultraviolet and extreme ultraviolet spectrometers will allow connecting high-Z sources to SOL transport and core impurity content...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910323/three-new-extreme-ultraviolet-spectrometers-on-nstx-u-for-impurity-monitoring
#6
M E Weller, P Beiersdorfer, V A Soukhanovskii, E W Magee, F Scotti
Three extreme ultraviolet (EUV) spectrometers have been mounted on the National Spherical Torus Experiment-Upgrade (NSTX-U). All three are flat-field grazing-incidence spectrometers and are dubbed X-ray and Extreme Ultraviolet Spectrometer (XEUS, 8-70 Å), Long-Wavelength Extreme Ultraviolet Spectrometer (LoWEUS, 190-440 Å), and Metal Monitor and Lithium Spectrometer Assembly (MonaLisa, 50-220 Å). XEUS and LoWEUS were previously implemented on NSTX to monitor impurities from low- to high-Z sources and to study impurity transport while MonaLisa is new and provides the system increased spectral coverage...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910220/inverse-vulcanization-of-sulfur-with-natural-dienes-as-sustainable-materials-for-lithium-sulfur-batteries
#7
David Mecerreyes, Iñaki Gomez, Alberto Blazquez, Olatz Leonet
Lithium sufur batteries are among the most promising next generation battery systems due to the high capacity properties of sulfur as cathodic material. Beyond its interesting intrinsic properties, sulfur possesses a very low conductivity and complex electrochemistry which involves the high solubility of the lithium sulfides in the electrolyte. These two characteristics trigger a series of limitations on its performance as active cathode material which leads to batteries with low cyclability. Recently, inverse vulcanizated sulfur has shown to retain capacity far better than elemental sulfur leading to batteries with excellent cyclability...
December 2, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27909897/nha2-is-expressed-in-distal-nephron-and-regulated-by-dietary-sodium
#8
Kalyan C Kondapalli, R Todd Alexander, Jennifer L Pluznick, Rajini Rao
Increased renal reabsorption of sodium is a significant risk factor in hypertension. An established clinical marker for essential hypertension is elevated sodium lithium countertransport (SLC) activity. NHA2 is a newly identified Na(+)(Li(+))/H(+) antiporter with potential genetic links to hypertension, which has been shown to mediate SLC activity and H(+)-coupled Na(+)(Li(+)) efflux in kidney-derived MDCK cells. To evaluate a putative role in sodium homeostasis, we determined the effect of dietary salt on NHA2...
December 1, 2016: Journal of Physiology and Biochemistry
https://www.readbyqxmd.com/read/27909597/lithium-intoxication-accompanied-by-hyponatremia
#9
Özlem Korkmaz Dilmen, İsmail Hacı, Alim Ekinci, Mois Bahar
Lithium is frequently used in the management of bipolar affective disorders. It has a narrow therapeutic index and can cause acute or chronic intoxication. Toxic symptoms may be present even when concentrations are within the recommended therapeutic range. We believe that lithium intoxication is a very important issue for a physician. In this report, we aimed to evaluate the pathophysiological view of two chronic lithium intoxication cases accompanied by hyponatremia.
August 2016: Turkish Journal of Anaesthesiology and Reanimation
https://www.readbyqxmd.com/read/27908117/investigating-tunnel-and-above-barrier-ionization-using-complex-scaled-coupled-cluster-theory
#10
Thomas-C Jagau
The theory and implementation of the complex-scaled coupled-cluster method with singles and doubles excitations (cs-CCSD) for studying resonances induced by static electric fields are presented. Within this framework, Stark shifts and ionization rates are obtained directly from the real and imaginary parts of the complex energy. The method is applied to the ground states of hydrogen, helium, lithium, beryllium, neon, argon, and carbon at varying field strengths. Complex-scaled Hartree-Fock, second-order many-body perturbation theory, and CCSD results are reported and analyzed with a focus on the impact of electron correlation on the ionization process...
November 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27908099/molecular-dynamics-study-of-nano-porous-materials-enhancement-of-mobility-of-li-ions-in-lithium-disilicate
#11
Junko Habasaki
In several nano-porous materials and their composites, enhancement of ionic conductivity has been reported and several mechanisms having different origins have been proposed so far. In the present work, ionic motion of Li ions in porous lithium disilicates is examined by molecular dynamics simulation in the constant volume conditions and the enhancement of the dynamics is predicted. Structures and dynamics of ions in a nano-porous system were characterized and visualized to clarify the mechanism of the enhancement...
November 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27908097/molecular-dynamics-analysis-of-the-effect-of-electronic-polarization-on-the-structure-and-single-particle-dynamics-of-mixtures-of-ionic-liquids-and-lithium-salts
#12
Volker Lesch, Hadrián Montes-Campos, Trinidad Méndez-Morales, Luis Javier Gallego, Andreas Heuer, Christian Schröder, Luis M Varela
We report a molecular dynamics study on the effect of electronic polarization on the structure and single-particle dynamics of mixtures of the aprotic ionic liquid 1-ethyl-3-methylimidazolium bis-(trifluoromethylsulfonyl)-imide ([EMIM][TFSI]) doped with a lithium salt with the same anion at 298 K and 1 bar. In particular, we analyze the effect of electron density fluctuations on radial distribution functions, velocity autocorrelation functions, cage correlation functions, mean-squared displacements, and vibrational densities of states, comparing the predictions of the quantum-chemistry-based Atomistic Polarizable Potential for Liquids, Electrolytes, & Polymers (APPLE&P) with those of its nonpolarizable version and those of the standard non-polarizable Optimized Potentials for Liquid Simulations-All Atom (OPLS-AA)...
November 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27906492/taming-metal-fluorine-carbenoids
#13
Sebastian Molitor, Kai-Stephan Feichtner, Viktoria H Gessner
While Li/Cl carbenoids are versatile reagents in organic synthesis, the controlled handling of the extremely reactive and labile M/F carbenoids remains a challenge. We now show that even these compounds can be stabilized and isolated in solid state as well as in solution. Particularly the sodium and potassium com¬pounds exhibit a remarkable stability, thus allowing the first isolation of a room temperature stable fluorine carbenoid. Spectro¬scopic as well as DFT studies confirm the pronounced carbenoid character, showing M-F-C interactions with elongated C-F bonds...
December 1, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27906253/tunable-bloch-surface-waves-in-anisotropic-photonic-crystals-based-on-lithium-niobate-thin-films
#14
Tatiana Kovalevich, Abdoulaye Ndao, Miguel Suarez, Saulius Tumenas, Zigmas Balevicius, Arunas Ramanavicius, Ieva Baleviciute, Markus Häyrinen, Matthieu Roussey, Markku Kuittinen, Thierry Grosjean, Maria-Pilar Bernal
We present an original type of one-dimensional photonic crystal that includes one anisotropic layer made of a lithium niobate thin film. We demonstrate the versatility of such a device sustaining different Bloch surface waves (BSWs), depending on the orientation of the incident wave. By varying the orientation of the illumination of the multilayer, we measured an angle variation of 7° between the BSWs corresponding to the extraordinary and the ordinary index of the lithium niobate thin film. The potential of such a platform opens the way to novel tunable and active planar optics based on the electro- and thermo-optical properties of lithium niobate...
December 1, 2016: Optics Letters
https://www.readbyqxmd.com/read/27906216/impact-of-the-photorefractive-and-pyroelectric-electro-optic-effect-in-lithium-niobate-on-whispering-gallery-modes
#15
Markus Leidinger, Christoph S Werner, Wataru Yoshiki, Karsten Buse, Ingo Breunig
Whispering-gallery resonators made of undoped and MgO-doped congruently grown lithium niobate are used to study electro-optic refractive index changes. Hereby, we focus on the volume photovoltaic and the pyroelectric effect, both providing an electric field driving the electro-optic effect. Our findings indicate that the light-induced photorefractive effect, combining the photovoltaic and electro-optic effect, is present only in the non-MgO-doped lithium niobate for exposure with light having wavelengths of up to 850 nm...
December 1, 2016: Optics Letters
https://www.readbyqxmd.com/read/27905699/green-light-vaporization-of-the-prostate-pvp-is-it-an-adult-technique
#16
Aldo Brassetti, Cosimo De Nunzio, Nicolas Barry Delongchamps, Cristian Fiori, Francesco Porpiglia, Andrea Tubaro
INTRODUCTION: Intending to overcome Transurethral resection of the prostate (TURP) in terms of safety maintaining its efficacy profile, have led to the introduction of minimally invasive laser therapies to treat men with lower urinary tract symptoms (LUTS) secondary to Benign prostatic obstruction (BPO), each one with its unique properties. Aim of this review was to analyse and summarize all the existing data regarding the 180 W Xcelerated Performance System (XPS) Potoselective Vaporization of the Prostate (PVP)...
December 1, 2016: Minerva Urologica e Nefrologica, the Italian Journal of Urology and Nephrology
https://www.readbyqxmd.com/read/27902868/the-tris-pentafluoroethyl-silanide-anion
#17
Nico Schwarze, Simon Steinhauer, Beate Neumann, Hans-Georg Stammler, Berthold Hoge
Tris(pentafluoroethyl)silane, which is conveniently accessible by the treatment of Si(C2 F5 )3 X (X=Cl, Br) with Bu3 SnH, was successfully employed for hydrosilylation reactions. In the presence of a palladium catalyst, hydrosilylation of phenylacetylene with Si(C2 F5 )3 H affords the product of an α-addition whereas the reaction of trimethylsilylacetylene with the silane leads to the β-trans product. Tris(pentafluoroethyl)silane can be deprotonated by sterically demanding bases such as lithium diisopropylamide at low temperatures to give the corresponding silanide ion...
November 30, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27902761/tlr-2-recognizes-propionibacterium-acnes-camp-factor-1-from-highly-inflammatory-strains
#18
Coralie Lheure, Philippe Alain Grange, Guillaume Ollagnier, Philippe Morand, Nathalie Désiré, Sophie Sayon, Stéphane Corvec, Jöel Raingeaud, Anne-Geneviève Marcelin, Vincent Calvez, Amir Khammari, Frédéric Batteux, Brigitte Dréno, Nicolas Dupin
BACKGROUND: Propionibacterium acnes (P. acnes) is an anaerobic, Gram-positive bacteria encountered in inflammatory acne lesions, particularly in the pilosebaceous follicle. P. acnes triggers a strong immune response involving keratinocytes, sebocytes and monocytes, the target cells during acne development. Lipoteicoic acid and peptidoglycan induce the inflammatory reaction, but no P. acnes surface protein interacting with Toll-like receptors has been identified. P. acnes surface proteins have been extracted by lithium stripping and shown to induce CXCL8 production by keratinocytes...
2016: PloS One
https://www.readbyqxmd.com/read/27902528/increased-brain-lactate-during-depressive-episodes-and-reversal-effects-by-lithium-monotherapy-in-drug-naive-bipolar-disorder-a-3-t-1h-mrs-study
#19
Rodrigo Machado-Vieira, Marcus V Zanetti, Maria C Otaduy, Rafael T De Sousa, Marcio G Soeiro-de-Souza, Alana C Costa, Andre F Carvalho, Claudia C Leite, Geraldo F Busatto, Carlos A Zarate, Wagner F Gattaz
OBJECTIVE: Mitochondrial dysfunction and energy metabolism impairment are key components in the pathophysiology of bipolar disorder (BD) and may involve a shift from aerobic to anaerobic metabolism. Measurement of brain lactate in vivo using proton magnetic resonance spectroscopy (H-MRS) represents an important tool to evaluate mitochondrial and metabolic dysfunction during mood episodes, as well as to monitor treatment response. To date, very few studies have quantified brain lactate in BD...
November 28, 2016: Journal of Clinical Psychopharmacology
https://www.readbyqxmd.com/read/27901523/superior-rate-capability-of-a-sulfur-composite-cathode-in-a-tris-trimethylsilyl-borate-containing-functional-electrolyte
#20
Lina Wang, Qinyu Li, Huijun Yang, Jun Yang, Yanna Nuli, Jiulin Wang
Lithium sulfur batteries (Li-S) have a 3-5 fold higher theoretical energy density than state-of-the-art lithium-ion batteries. In this work, tris(trimethylsilyl)borate (TMSB) is reported for the first time as an effective electrolyte additive to enhance the electrochemical performance of a Li-S battery. With 1% TMSB additive, the sulfur composite cathodes show good cycling stability and outstanding rate capability, and deliver a highly reversible capacity of 1423 mA h g(-1) even at 10C. TMSB participates in the formation of a surface layer on sulfur-pyrolyzed polyacrylonitrile (S@pPAN) cathodes, which accelerates lithium ion diffusion and stabilizes the interface...
November 30, 2016: Chemical Communications: Chem Comm
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