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https://www.readbyqxmd.com/read/28936331/double-c-h-bond-activation-of-acetylene-by-atomic-boron-in-forming-aromatic-cyclic-hbc2bh-in-solid-neon
#1
Jiwen Jian, Wei Li, Xuan Wu, Mingfei Zhou
The organo-boron species formed from the reactions of boron atoms with acetylene in solid neon are investigated using matrix isolation infrared spectroscopy with isotopic substitutions as well as quantum chemical calculations. Besides the previously reported single C-H bond activation species, a cyclic-HBC2BH diboron species is formed via double C-H bond activation of acetylene. It is characterized to have a closed-shell singlet ground state with planar D2h symmetry. Bonding analysis indicates that it is a doubly aromatic species involving two delocalized σ electrons and two delocalized π electrons...
June 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28892176/the-role-of-gesture-in-supporting-mental-representations-the-case-of-mental-abacus-arithmetic
#2
Neon B Brooks, David Barner, Michael Frank, Susan Goldin-Meadow
People frequently gesture when problem-solving, particularly on tasks that require spatial transformation. Gesture often facilitates task performance by interacting with internal mental representations, but how this process works is not well understood. We investigated this question by exploring the case of mental abacus (MA), a technique in which users not only imagine moving beads on an abacus to compute sums, but also produce movements in gestures that accompany the calculations. Because the content of MA is transparent and readily manipulated, the task offers a unique window onto how gestures interface with mental representations...
September 11, 2017: Cognitive Science
https://www.readbyqxmd.com/read/28818942/an-unusual-white-dwarf-star-may-be-a-surviving-remnant-of-a-subluminous-type-ia-supernova
#3
S Vennes, P Nemeth, A Kawka, J R Thorstensen, V Khalack, L Ferrario, E H Alper
Subluminous Type Ia supernovae, such as the Type Iax-class prototype SN 2002cx, are described by a variety of models such as the failed detonation and partial deflagration of an accreting carbon-oxygen white dwarf star or the explosion of an accreting, hybrid carbon-oxygen-neon core. These models predict that bound remnants survive such events with, according to some simulations, a high kick velocity. We report the discovery of a high proper motion, low-mass white dwarf (LP 40-365) that travels at a velocity greater than the Galactic escape velocity and whose peculiar atmosphere is dominated by intermediate-mass elements...
August 18, 2017: Science
https://www.readbyqxmd.com/read/28818779/in-vitro-culture-responses-callus-growth-and-organogenetic-potential-of-brinjal-solanum-melongena-l-to-he-ne-laser-irradiation
#4
Puthanvila Surendrababu Swathy, Gogia Rupal, Vijendra Prabhu, Krishna Kishore Mahato, Annamalai Muthusamy
The present investigation was designed to analyze the influence of Helium-Neon (He-Ne 632.8nm) laser irradiation on defense enzymes, proline content and in vitro responses of callus induction, shoot initiation and on plantlet regeneration potential of brinjal. The seeds of Mattu Gulla (Solanum melongena L.) were irradiated with 20, 25 and 30J/cm(2) of He-Ne laser followed by surface sterilization and sprouted on Murashige and Skoog medium without plant growth regulators. The activity of defense enzymes, proline content and the organogenetic potential of hypocotyl, leaf and shoot tip explants were determined from thirty day old seedlings...
August 10, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28802452/connoted-hazard-and-perceived-importance-of-fluorescent-neon-and-standard-safety-colors
#5
O A Zielinska, C B Mayhorn, M S Wogalter
OBJECTIVE: The perceived hazard and rated importance of standard safety, fluorescent, and neon colors are investigated. BACKGROUND: Colors are used in warnings to enhance hazard communication. Red has consistently been rated as the highest in perceived hazard. Orange, yellow, and black are the next highest in connoted hazard; however, there is discrepancy in their ordering. Safety standards, such as ANSI Z535.1, also list colors to convey important information, but little research has examined the perceived importance of colors...
November 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28771307/co-registered-in-situ-secondary-electron-and-mass-spectral-imaging-on-the-helium-ion-microscope-demonstrated-using-lithium-titanate-and-magnesium-oxide-nanoparticles
#6
D Dowsett, T Wirtz
The development of a high resolution elemental imaging platform combining coregistered secondary ion mass spectrometry and high resolution secondary electron imaging is reported. The basic instrument setup and operation are discussed and in situ image correlation is demonstrated on a lithium titanate and magnesium oxide nanoparticle mixture. The instrument uses both helium and neon ion beams generated by a gas field ion source to irradiate the sample. Both secondary electrons and secondary ions may be detected...
September 5, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28764340/a-matrix-isolation-esr-and-theoretical-study-of-mgn
#7
Thomas S Hearne, Sally A Yates, Duncan A Wild, Allan J McKinley
Matrix isolation experiments have been conducted on the Mg(14)N, (25)Mg(14)N, Mg(15)N, and (25)Mg(15)N radicals which were formed by the reaction of a plume of magnesium metal produced with laser ablation and either acetonitrile vapour or nitrogen atoms. The radicals were isolated in an inert neon matrix at 4.3 K and studied with electron spin resonance spectroscopy. The ground electronic state of MgN was determined to be (4)Σ(-). The following magnetic parameters were determined experimentally for MgN: g⊥ = 2...
July 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28750344/aerosol-pollution-and-its-potential-impacts-on-outdoor-human-thermal-sensation-east-asian-perspectives
#8
Ka-Ming Wai, Edward Y Y Ng, Charles M S Wong, Tanya Z Tan, Tang-Huang Lin, Wei-Hung Lien, Peter A Tanner, Carlo S H Wang, Kevin K L Lau, Neon M H He, Jhoon Kim
Aerosols affect the insolation at ground and thus the Aerosol Optical Depth (AOD, a measure of aerosol pollution) plays an important role on the variation of the Physiological Equivalent Temperature (PET) at locations with different aerosol climatology. The aerosol effects upon PET were studied for the first time at four East Asian cities by coupling a radiative transfer model and a human thermal comfort model which were previously well evaluated. Evident with the MODIS and AERONET AOD observations, the aerosol pollution at Beijing and Seoul was higher than at Chiayi (Taiwan) and Hong Kong...
October 2017: Environmental Research
https://www.readbyqxmd.com/read/28732441/determination-of-the-residual-entropy-of-simple-mixtures-by-monte-carlo-simulation
#9
Eric Detmar, Simin Yazdi Nezhad, Ulrich K Deiters
Extensive Monte Carlo simulations were performed for (neon + krypton) mixtures for temperatures between 200 K and 600 K and pressures up to 1 GPa, using Lennard-Jones potentials to describe the intermolecular interactions. The residual entropies were obtained via Widom's insertion method, as well as via an integration technique. At high pressures, the residual entropy is, to a very good approximation, a linear function of λa(-1), which is the reciprocal value of the average Monte Carlo displacement parameter that gives the acceptance ratio a for translational moves...
August 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28671232/fast-crystalline-ice-formation-at-extremely-low-temperature-through-water-neon-matrix-sublimation
#10
Tetsuya Hama, Shinnosuke Ishizuka, Tomoya Yamazaki, Yuki Kimura, Akira Kouchi, Naoki Watanabe, Toshiki Sugimoto, Valerio Pirronello
Crystalline ice formation requires water molecules to be sufficiently mobile to find and settle on the thermodynamically most stable site. Upon cooling, however, diffusion and rearrangement become increasingly kinetically difficult. Water ice grown by the condensation of water vapor in laboratory is thus generally assumed to be in a metastable amorphous form below 100 K. Here, we demonstrate the possibility of crystalline ice formation at extremely low temperature using a water/neon matrix (1/1000, 30 000 monolayers) prepared at 6 K, which is subsequently warmed to 11-12 K...
July 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28668045/probing-the-global-potential-energy-minimum-of-ch2o-2-thz-absorption-spectrum-of-ch2o-2-in-solid-neon-and-para-hydrogen
#11
J Andersen, A Voute, D Mihrin, J Heimdal, R W Berg, M Torsson, R Wugt Larsen
The true global potential energy minimum configuration of the formaldehyde dimer (CH2O)2, including the presence of a single or a double weak intermolecular CH⋯O hydrogen bond motif, has been a long-standing subject among both experimentalists and theoreticians as two different energy minima conformations of Cs and C2h symmetry have almost identical energies. The present work demonstrates how the class of large-amplitude hydrogen bond vibrational motion probed in the THz region provides excellent direct spectroscopic observables for these weak intermolecular CH⋯O hydrogen bond motifs...
June 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28641425/first-infrared-investigations-of-ocs-h2o-ocs-h2o-2-and-ocs-2-h2o-complexes-isolated-in-solid-neon-highlighting-the-presence-of-two-isomers-for-ocs-h2o
#12
P Soulard, B Madebène, B Tremblay
For the first time, complexes involving carbonyl sulfide (OCS) and water molecules are studied by FTIR in solid neon. Many new absorption bands close to the known fundamental modes for the monomers give evidence for at least three (OCS)n-(H2O)m complexes, noted n:m. With the help of theoretical calculations, two isomers of the 1:1 complex are clearly identified. Concentration effects combined with a detailed vibrational analysis allow for the identification of transitions for the 1:1, 1:2, and 2:1 complexes...
June 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28620281/inhibition-of-the-mitochondrial-glutamate-carrier-slc25a22-in-astrocytes-leads-to-intracellular-glutamate-accumulation
#13
Emmanuelle Goubert, Yanina Mircheva, Francesco M Lasorsa, Christophe Melon, Emanuela Profilo, Julie Sutera, Hélène Becq, Ferdinando Palmieri, Luigi Palmieri, Laurent Aniksztejn, Florence Molinari
The solute carrier family 25 (SLC25) drives the import of a large diversity of metabolites into mitochondria, a key cellular structure involved in many metabolic functions. Mutations of the mitochondrial glutamate carrier SLC25A22 (also named GC1) have been identified in early epileptic encephalopathy (EEE) and migrating partial seizures in infancy (MPSI) but the pathophysiological mechanism of GC1 deficiency is still unknown, hampered by the absence of an in vivo model. This carrier is mainly expressed in astrocytes and is the principal gate for glutamate entry into mitochondria...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28619939/coherent-imaging-of-an-attosecond-electron-wave-packet
#14
D M Villeneuve, Paul Hockett, M J J Vrakking, Hiromichi Niikura
Electrons detached from atoms or molecules by photoionization carry information about the quantum state from which they originate, as well as the continuum states into which they are released. Generally, the photoelectron momentum distribution is composed of a coherent sum of angular momentum components, each with an amplitude and phase. Here we show, by using photoionization of neon, that a train of attosecond pulses synchronized with an infrared laser field can be used to disentangle these angular momentum components...
June 16, 2017: Science
https://www.readbyqxmd.com/read/28580119/pentavalent-lanthanide-nitride-oxides-npro-and-npro-complexes-with-n%C3%A2-pr-triple-bonds
#15
Shu-Xian Hu, Jiwen Jian, Jing Su, Xuan Wu, Jun Li, Mingfei Zhou
The neutral molecule NPrO and its anion NPrO(-) are produced via co-condensation of laser-ablated praseodymium atoms with nitric oxide in a solid neon matrix. Combined infrared spectroscopy and state-of-the-art quantum chemical calculations confirm that both species are pentavalent praseodymium nitride-oxides with linear structures that contain Pr≡N triple bonds and Pr=O double bonds. Electronic structure studies show that the neutral NPrO molecule features a 4f(0) electron configuration and a Pr(v) oxidation state similar to that of the isoelectronic PrO2(+) ion, while its NPrO(-) anion possesses a 4f(1) electron configuration and a Pr(iv) oxidation state...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28527450/on-the-accuracy-of-one-and-two-particle-solvation-entropies
#16
Benedict W J Irwin, David J Huggins
Evaluating solvation entropies directly and combining with direct energy calculations is one way of calculating free energies of solvation and is used by Inhomogeneous Fluid Solvation Theory (IFST). The configurational entropy of a fluid is a function of the interatomic correlations and can thus be expressed in terms of correlation functions. The entropies in this work are directly calculated from a truncated series of integrals over these correlation functions. Many studies truncate all terms higher than the solvent-solute correlations...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28527443/competition-between-weak-oh%C3%A2-%C3%AF-and-ch%C3%A2-o-hydrogen-bonds-thz-spectroscopy-of-the-c2h2-h2o-and-c2h4-h2o-complexes
#17
J Andersen, J Heimdal, B Nelander, R Wugt Larsen
THz absorption spectra have been recorded for the weakly bound molecular complexes of H2O with C2H4 and C2H2 embedded in cryogenic neon matrices at 2.8 K. The observation and assignment of a large-amplitude acceptor OH librational mode of the C2H2-H2O complex at 145.5 cm(-1) confirms an intermolecular CH⋯O hydrogen-bonded configuration of C2v symmetry with the H2O subunit acting as the hydrogen bond acceptor. The observation and assignment of two large-amplitude donor OH librational modes of the C2H4-H2O complex at 255...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28500952/isolation-and-characterization-of-lymphoid-enhancer-factor-1-positive-deciduous-dental-pulp-stem-like-cells-after-transfection-with-a-piggybac-vector-containing-lef1-promoter-driven-selection-markers
#18
Tomoya Murakami, Issei Saitoh, Masahiro Sato, Emi Inada, Miki Soda, Masataka Oda, Hisanori Domon, Yoko Iwase, Tadashi Sawami, Kazunari Matsueda, Yutaka Terao, Hayato Ohshima, Hirofumi Noguchi, Haruaki Hayasaki
OBJECTIVE: Lymphoid enhancer-binding factor-1 (LEF1) is a 48-kD nuclear protein that is expressed in pre-B and T cells. LEF1 is also an important member of the Wnt/β-catenin signaling pathway that plays important roles in the self-renewal and differentiation of embryonic stem cells. We speculated that LEF1 might function in the stem cells from human exfoliated deciduous teeth (SHED). In this study, we attempted to isolate such LEF1-positive cells from human deciduous dental pulp cells (HDDPCs) by genetic engineering technology, using the human LEF1 promoter...
May 7, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28493106/human-classifier-observers-can-deduce-task-solely-from-eye-movements
#19
Brett Bahle, Mark Mills, Michael D Dodd
Computer classifiers have been successful at classifying various tasks using eye movement statistics. However, the question of human classification of task from eye movements has rarely been studied. Across two experiments, we examined whether humans could classify task based solely on the eye movements of other individuals. In Experiment 1, human classifiers were shown one of three sets of eye movements: Fixations, which were displayed as blue circles, with larger circles meaning longer fixation durations; Scanpaths, which were displayed as yellow arrows; and Videos, in which a neon green dot moved around the screen...
May 10, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28487005/nitrogen-gas-field-ion-source-gfis-focused-ion-beam-fib-secondary-electron-imaging-a-first-look
#20
Marek E Schmidt, Anto Yasaka, Masashi Akabori, Hiroshi Mizuta
The recent technological advance of the gas field ion source (GFIS) and its successful integration into systems has renewed the interest in the focused ion beam (FIB) technology. Due to the atomically small source size and the use of light ions, the limitations of the liquid metal ion source are solved as device dimensions are pushed further towards the single-digit nanometer size. Helium and neon ions are the most widely used, but a large portfolio of available ion species is desirable, to allow a wide range of applications...
May 10, 2017: Microscopy and Microanalysis
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