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https://www.readbyqxmd.com/read/28213446/acetylcholine-release-in-prefrontal-cortex-promotes-gamma-oscillations-and-theta-gamma-coupling-during-cue-detection
#1
W M Howe, H J Gritton, N Lusk, Erik A Roberts, Vaughn L Hetrick, Joshua D Berke, Martin Sarter
The capacity for using external cues to guide behavior ("cue detection") constitutes an essential aspect of attention and goal-directed behavior. The cortical cholinergic input system, via phasic increases in prefrontal acetylcholine release, plays an essential role in attention by mediating such cue detection. However, the relationship between cholinergic signaling during cue detection and neural activity dynamics in prefrontal networks remains unclear. Here we combined sub-second measures of cholinergic signaling, neurophysiological recordings, and cholinergic receptor blockade to delineate the cholinergic contributions to prefrontal oscillations during cue detection in rats...
February 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28209766/glycosylated-chromogranin-a-in-heart-failure-implications-for-processing-and-cardiomyocyte-calcium-homeostasis
#2
Anett Hellebø Ottesen, Cathrine R Carlson, William E Louch, Mai Britt Dahl, Ragnhild A Sandbu, Rune Forstrøm Johansen, Hilde Jarstadmarken, Magnar Bjørås, Arne Didrik Høiseth, Jon Brynildsen, Ivar Sjaastad, Mats Stridsberg, Torbjørn Omland, Geir Christensen, Helge Røsjø
BACKGROUND: Chromogranin A (CgA) levels have previously been found to predict mortality in heart failure (HF), but currently no information is available regarding CgA processing in HF and whether the CgA fragment catestatin (CST) may directly influence cardiomyocyte function. METHODS AND RESULTS: CgA processing was characterized in postinfarction HF mice and in patients with acute HF, and the functional role of CST was explored in experimental models. Myocardial biopsies from HF, but not sham-operated mice, demonstrated high molecular weight CgA bands...
February 2017: Circulation. Heart Failure
https://www.readbyqxmd.com/read/28208633/compact-planar-ultrawideband-antennas-with-3-5-5-2-5-8-ghz-triple-band-notched-characteristics-for-internet-of-things-applications
#3
Jian Dong, Qianqian Li, Lianwen Deng
Ultrawideband (UWB) antennas, as core devices in high-speed wireless communication, are widely applied to mobile handsets, wireless sensor networks, and Internet of Things (IoT). A compact printed monopole antenna for UWB applications with triple band-notched characteristics is proposed in this paper. The antenna has a very compact size of 10 x 16 mm2 and is composed of a square slotted radiation patch and a narrow rectangular ground plane on the back of the substrate. First, by etching a pair of inverted T-shaped slots at the bottom of the radiation patch, one notched band at 5-6 GHz for rejecting the Wireless Local Area Network (WLAN) is generated...
February 10, 2017: Sensors
https://www.readbyqxmd.com/read/28208289/atmospheric-pressure-vaporization-mechanism-for-coupling-a-liquid-phase-with-electron-ionization-mass-spectrometry
#4
Veronica Termopoli, Giorgio Famiglini, Pierangela Palma, Maurizio Piergiovanni, Achille Cappiello
A novel liquid chromatography-mass spectrometry (LC-MS) interfacing concept is presented and discussed. The new interface, called liquid-EI (LEI), is based on electron ionization (EI) but, differently from any previous attempt, the vaporization of solutes and mobile phase takes place at atmospheric pressure into a specifically designed region, called "vaporization microchannel", before entering the high-vacuum ion source. The interface is completely independent from the rest of the instrumentation and can be adapted to any gas chromatography/mass spectrometry (GC/MS) system, as an add-on for a rapid LC-MS conversion...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208094/a-simple-strategy-to-refine-cu2o-photocatalytic-capacity-for-refractory-pollutants-removal-roles-of-oxygen-reduction-and-fe-ii-chemistry
#5
Ai-Yong Zhang, Yuan-Yi He, Tan Lin, Nai-Hui Huang, Qiao Xu, Jing-Wei Feng
Visible-light-driven photocatalysis is a promising technology for advanced water treatment, but it usually exhibits a low efficiency. Cu2O is a low-cost semiconductor with narrow band gap, high absorption coefficient and suitable conduction band, but suffers from low charge mobility, poor quantum yield and weak catalytic performance. Herein, the Cu2O catalytic capacity for refractory pollutants degradation is drastically improved by a simple and effective strategy. By virtue of the synergistic effects between photocatalysis and Fenton, a novel and efficient photocatalysis-driven Fenton system, PFC, is originally proposed and experimentally validated using Cu2O/Nano-C hybrids...
January 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28203542/robotic-trans-atrial-and-trans-mitral-ventricular-septal-resection
#6
REVIEW
W Randolph Chitwood
Localized ventricular septal hypertrophy, also known as idiopathic hypertrophic subaortic stenosis or idiopathic hypertrophic subaortic septal obstruction (IHSS), can create severe ventricular outflow obstruction. This often results in a high sub-aortic pressure gradient with potentially lethal symptoms. In 1960, Braunwald described the hemodynamic characteristics of IHSS, and thereafter, Morrow developed a trans-aortic approach to resect a large part of the ventricular septum, enlarging the outflow tract. The Morrow operation has remained the gold standard for surgically treating this pathology...
January 2017: Annals of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/28198352/origin-of-the-apparent-delocalization-of-the-conduction-band-in-high-mobility-amorphous-semiconductors
#7
Albert de Jamblinne de Meux, Geoffrey Pourtois, Jan Genoe, Paul Heremans
In this paper, we show that the apparent delocalization of the conduction band reported from first-principles simulations for the high-mobility amorphous oxide semiconductor InGaZnO<sub>4</sub> (a-IGZO) is an artifact induced by the periodic conditions imposed to the model. Given a sufficiently large unit-cell dimension (over 40Å), the conduction band becomes localized. Such model size is up to four times the size of commonly used models for the study of a-IGZO. This finding challenges the analyses done so far on the nature of the defects and on the interpretation of numerous electrical measurements...
February 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28195492/gate-tunable-giant-stark-effect-in-few-layer-black-phosphorus
#8
Yanpeng Liu, Zhizhan Qiu, Alexandra Carvalho, Yang Bao, Hai Xu, Sherman Jun Rong Tan, Wei Liu, Antonio H Castro Neto, Kian Ping Loh, Jiong Lu
Two-dimensional black phosphorus (BP) has sparked enormous research interest due to its high carrier mobility, layer-dependent direct bandgap and outstanding in-plane anisotropic properties. BP is one of the few two-dimensional materials where it is possible to tune the bandgap over a wide energy range from the visible up to the infrared. In this article, we report the observation of a giant Stark effect in electrostatically-gated few-layer BP. Using low temperature scanning tunnelling microscopy, we observed that in few-layer BP, when electrons are injected, a monotonic reduction of the bandgap occurs...
February 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/28186113/strain-gated-bilayer-molybdenum-disulfide-field-effect-transistor-with-edge-contacts
#9
Yu Chai, Shanshan Su, Dong Yan, Mihrimah Ozkan, Roger Lake, Cengiz S Ozkan
Silicon nitride stress capping layer is an industry proven technique for increasing electron mobility and drive currents in n-channel silicon MOSFETs. Herein, the strain induced by silicon nitride is firstly characterized through the changes in photoluminescence and Raman spectra of a bare bilayer MoS2 (Molybdenum disulfide). To make an analogy of the strain-gated silicon MOSFET, strain is exerted to a bilayer MoS2 field effect transistor (FET) through deposition of a silicon nitride stress liner that warps both the gate and the source-drain area...
February 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28181521/determining-the-nature-of-the-gap-in-semiconducting-graphene
#10
J C Prestigiacomo, A Nath, M S Osofsky, S C Hernández, V D Wheeler, S G Walton, D K Gaskill
Since its discovery, graphene has held great promise as a two-dimensional (2D) metal with massless carriers and, thus, extremely high-mobility that is due to the character of the band structure that results in the so-called Dirac cone for the ideal, perfectly ordered crystal structure. This promise has led to only limited electronic device applications due to the lack of an energy gap which prevents the formation of conventional device geometries. Thus, several schemes for inducing a semiconductor band gap in graphene have been explored...
February 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28178374/simultaneous-densitometric-determination-of-anthelmintic-drug-albendazole-and-its-metabolite-albendazole-sulfoxide-by-hptlc-in-human-plasma-and-pharmaceutical-formulations
#11
Jui J Pandya, Mallika Sanyal, Pranav S Shrivastav
A new, simple, accurate and precise high-performance thin layer chromatographic method has been developed and validated for simultaneous determination of an anthelmintic drug, albendazole and its active metabolite albendazole sulfoxide. Planar chromatographic separation was performed on aluminium-backed layer of silica gel 60G F254 using a mixture of toluene- acetonitrile-glacial acetic acid (7.0: 2.9: 0.1, v/v/v) as the mobile phase. For quantitation, the separated spots were scanned densitometrically at 225 nm...
February 8, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28177255/exploring-the-thermoelectric-performance-of-bagd2nio5-haldane-gap-materials
#12
Narendar Nasani, Carlos Miguel Oliveira Rocha, Andrei V Kovalevsky, Gonzalo Otero Irurueta, Sascha Populoh, Philipp Thiel, Anke Weidenkaff, Fernando Neto da Silva, Duncan P Fagg
One-dimensional Haldane gap materials, such as the rare earth barium chain nickelates, have received great interest due to their vibrant one-dimensional spin antiferromagnetic character and unique structure. Herein we report how these 1D structural features can also be highly beneficial for thermoelectric applications by analysis of the system CaxBaGd2-xNiO5 0 ≤ x ≤ 0.25. Attractive Seebeck coefficients of 140-280 μV K(-1) at 350-1300 K are retained even at high acceptor-substitution levels, provided by the interplay of low dimensionality and electronic correlations...
February 8, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28177212/amorphous-tin-oxide-as-low-temperature-processed-electron-transport-layer-for-organic-and-hybrid-perovskite-solar-cells
#13
Jeremy Barbe, Max L Tietze, Marios Neophytou, Banavoth Murali, Erkki Alarousu, Abdulrahman El Labban, Mutalifu Abulikemu, Wan Yue, Omar F Mohammed, Iain McCulloch, Aram Amassian, Silvano Del Gobbo
The chemical bath deposition of tin oxide (SnO2) thin films as electron transporting layer (ETL) in planar heterojunction n-i-p organohalide lead perovskite and organic bulk heterojunction solar cells is reported. The amorphous SnO2 films are grown from a non-toxic aqueous bath of tin chloride at very low temperatures (55°C) and do not require post-annealing treatment to work very effectively as ETL in planar heterojunction n-i-p organohalide lead perovskite or organic bulk heterojunction solar cells, in lieu of the commonly used ETL materials TiO2 and ZnO, respectively...
February 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28177026/a-co-monolayer-first-principles-design-of-a-new-direct-band-gap-semiconductor-with-excellent-mechanical-properties
#14
Zi-Wei Teng, Chun-Sheng Liu, Xiao-Hong Yan
Group V monolayers, e.g., nitrogene, phosphorene, arsenene, and antimonene have recently emerged as attractive candidates for electronic and optoelectronic applications. However, these pristine monolayers are not able to possess direct band gaps suitable for ultraviolet-blue photoresponse. First-principles calculations show that the Pmma-CO monolayer has a direct band gap of 2.4 eV, and predict that the system has a good stability. Unlike an easy direct-indirect gap transition under small strains in phosphorene, the direct band gap feature of Pmma-CO is maintained under a strain up to 12%...
February 8, 2017: Nanoscale
https://www.readbyqxmd.com/read/28170011/synthesis-and-evaluation-of-new-copper-ketoiminate-precursors-for-a-facile-and-additive-free-solution-based-approach-to-nanoscale-copper-oxide-thin-films
#15
Sarah Karle, Detlef Rogalla, Arne Ludwig, Hans-Werner Becker, Andreas Dirk Wieck, Markus Grafen, Andreas Ostendorf, Anjana Devi
Novel copper ketoiminate compounds were synthesized and for the first time applied for additive-free solution-based deposition of nanoscale copper oxide thin films. The two closely related compounds, namely the bis[4-(2-ethoxyethyl-imino)-3-pentanonato]copper, [Cu(EEKI)2], and bis[4-(3-methoxypropylimino)-3-pentanonato]copper, [Cu(MPKI)2], were characterized by means of elemental and thermogravimetric analysis (TGA), as well as electron impact mass spectrometry (EI-MS). The advantages of these compounds are that they are liquid and possess excellent solubility in common organic solvents in addition to an optimum reactivity towards ambient moisture that enables a facile solution-based approach to nanoscale copper oxide thin films...
February 7, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28165108/predicting-a-graphene-like-wb4-nanosheet-with-a-double-dirac-cone-an-ultra-high-fermi-velocity-and-significant-gap-opening-by-spin-orbit-coupling
#16
Chunmei Zhang, Yalong Jiao, Fengxian Ma, Steven Bottle, Mingwen Zhao, Zhongfang Chen, Aijun Du
The zero-band gap nature of graphene prevents it from performing as a semi-conductor in modern electronics. Although various graphene modification strategies have been developed to address this limitation, the very small band gap of these materials and the suppressed charge carrier mobility of the devices developed still significantly hinder graphene's applications. In this work, a two dimensional (2D) WB4 monolayer, which exhibits a double Dirac cone, was conceived and assessed using density functional theory (DFT) methods, which would provide a sizable band gap while maintaining higher charge mobility with a Fermi velocity of 1...
February 6, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28134642/popliteal-pterygium-syndrome-with-syngnathia
#17
Andrea Sisti, Nicola Freda, Alessandro Giacomina, Gian Luca Gatti
Popliteal pterygium syndrome is a condition characterized by skin webs of skin on the popliteal fossa, which may impair mobility unless surgically repaired. Affected individuals may also have syndactyly on the fingers and/or toes. Most people with this disorder present cleft lip and cleft palate and they can have syngnathia, which is a congenital adhesion between maxilla and mandible by fibrous bands, which affects the opening of the mouth. The case that we report is about a 2-month-old male, who presented skin webs bilaterally on the popliteal fossa, syndactyly between the IV and the V toe of the right foot and between the III and the IV toe of the left foot, and genital malformations...
January 27, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28134363/engineering-the-electronic-and-optoelectronic-properties-of-inx-x-s-se-te-monolayers-via-strain
#18
Hao Jin, Jianwei Li, Ying Dai, Yadong Wei
In this paper, we present a comprehensive study on the electronic and optoelectronic properties of indium monochalcogenide (InX with X = S, Se, Te) monolayers with and without strains. Our results show that InX monolayers are indirect semiconductors. Upon the application of strain, the band structures can be modulated and an indirect-to-direct bandgap transition is observed in an InSe monolayer. The electron mobility of up to 2.0 × 10(3) cm(2) (V s)(-1) is quantitatively determined in the framework of deformation potential theory...
January 30, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28128933/computational-sensing-using-low-cost-and-mobile-plasmonic-readers-designed-by-machine-learning
#19
Zachary S Ballard, Daniel Shir, Aashish Bhardwaj, Sarah Bazargan, Shyama Sathianathan, Aydogan Ozcan
Plasmonic sensors have been used for a wide range of biological and chemical sensing applications. Emerging nanofabrication techniques have enabled these sensors to be cost-effectively mass manufactured onto various types of substrates. To accompany these advances, major improvements in sensor read-out devices must also be achieved to fully realize the broad impact of plasmonic nanosensors. Here, we propose a machine learning framework which can be used to design low-cost and mobile multispectral plasmonic readers that do not use traditionally employed bulky and expensive stabilized light sources or high-resolution spectrometers...
February 1, 2017: ACS Nano
https://www.readbyqxmd.com/read/28127602/the-crucial-role-of-selenium-for-sulphur-substitution-in-the-structural-transitions-and-thermoelectric-properties-of-cu5fes4-bornite
#20
V Pavan Kumar, T Barbier, P Lemoine, B Raveau, V Nassif, E Guilmeau
Bornite Cu5FeS4-xSex (0 ≤ x ≤ 0.6) compounds have been synthesized, using mechanical alloying, combined with spark plasma sintering (SPS). High temperature in situ neutron powder diffraction data collected on pristine Cu5FeS4 from room temperature up to 673 K show that SPS enables the stabilization of the intermediate cubic (IC) semi-ordered form (Fm3[combining macron]m, aIC ∼ 10.98 Å) at the expense of the ordered orthorhombic form (Pbca, aO ∼ 10.95 Å, bO ∼ 21.86 Å, cO ∼ 10.95 Å) in the 300-475 K temperature range, whereas above 475 K the IC form coexists with the high temperature cubic (C) form (Fm3[combining macron]m, aC ∼ 5...
January 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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