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https://www.readbyqxmd.com/read/28742091/multiple-visual-objects-are-sampled-sequentially
#1
Ole Jensen, Marlies E Vissers
When acting in a complex visual environment, it is essential to be able to flexibly allocate attention to parts of the visual scene that may contain goal-relevant information. The paper by Jia et al. provides novel evidence that our brains sequentially sample different objects in a visual scene. The results were obtained using "temporal response functions," in which unique electroencephalographic (EEG) signals corresponding to the processing of 2 continuously presented objects were isolated in an object-specific way...
July 24, 2017: PLoS Biology
https://www.readbyqxmd.com/read/28742045/a-multi-class-tactile-brain-computer-interface-based-on-stimulus-induced-oscillatory-dynamics
#2
Lin Yao, Mei Lin Chen, Xinjun Sheng, Natalie Mrachacz-Kersting, Xiangyang Zhu, Dario Farina, Ning Jiang
We proposed a multi-class tactile brain-computer interface that utilizes stimulus-induced oscillatory dynamics. It was hypothesized that somatosensory attention can modulate tactile induced oscillation changes, which can decode different sensation attention tasks. Subjects performed four tactile attention tasks, prompted by cues presented in random order and while both wrists were simultaneously stimulated: 1) selective sensation on left hand (SS-L), 2) selective sensation on right hand (SS-R), 3) bilateral selective sensation (SS-B), and 4) selective sensation suppressed or idle state (SS-S)...
July 24, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28741598/plasmonic-enhancement-of-cyanine-dyes-for-near-infrared-light-triggered-photodynamic-photothermal-therapy-and-fluorescent-imaging
#3
Mindan Lu, Ning Kang, Chuan Chen, Liuqing Yang, Yang Li, Minghui Hong, Xiangang Luo, Lei Ren, Xiumin Wang
Near infrared (NIR) triggered cyanine dyes have attracted considerable attentions in multi-modal tumor theranostics. However, near infrared (NIR) cyanine dyes used in tumor treatment often suffer from low fluorescence intensity and weak singlet oxygen generation efficiency, resulting in inadequate diagnostic and therapy efficacies for tumors. It is still a great challenge to improve both the photodynamic therapy (PDT) and fluorescent imaging (FLI) efficacy of cyanine dyes in tumor applications. Herein, a novel multifunctional nanoagent of AuNRs@SiO2-IR795 was developed to realize the integrated photothermal/photodynamic therapy (PTT/PDT) and FLI at a very low dosage of IR795 (0...
July 25, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28740983/combining-epr-spectroscopy-and-x-ray-crystallography-to-elucidate-the-structure-and-dynamics-of-conformationally-constrained-spin-labels-in-t4-lysozyme-single-crystals
#4
Philipp Consentius, Ulrich Gohlke, Bernhard Loll, Claudia Alings, Udo Heinemann, Markus C Wahl, Thomas Risse
Electron paramagnetic resonance (EPR) spectroscopy in combination with site-directed spin labeling is used to investigate the structure and dynamics of conformationally constrained spin labels in T4 lysozyme single crystals. Within a single crystal, the oriented ensemble of spin bearing moieties results in a strong angle dependence of the EPR spectra. A quantitative description of the EPR spectra requires the determination of the unit cell orientation with respect to the sample tube and the orientation of the spin bearing moieties within the crystal lattice...
July 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28740865/superconductivity-across-lifshitz-transition-and-anomalous-insulating-state-in-surface-k-dosed-li0-8fe0-2oh-fese
#5
Mingqiang Ren, Yajun Yan, Xiaohai Niu, Ran Tao, Die Hu, Rui Peng, Binping Xie, Jun Zhao, Tong Zhang, Dong-Lai Feng
In iron-based superconductors, understanding the relation between superconductivity and electronic structure upon doping is crucial for exploring the pairing mechanism. Recently, it was found that, in iron selenide (FeSe), enhanced superconductivity (Tc of more than 40 K) can be achieved via electron doping, with the Fermi surface only comprising M-centered electron pockets. By using surface K dosing, scanning tunneling microscopy/spectroscopy, and angle-resolved photoemission spectroscopy, we studied the electronic structure and superconductivity of (Li0...
July 2017: Science Advances
https://www.readbyqxmd.com/read/28740825/nmdar-hypofunction-and-somatostatin-expressing-gabaergic-interneurons-and-receptors-a-newly-identified-correlation-and-its-effects-in-schizophrenia
#6
REVIEW
Fatemah Alherz, Mohammad Alherz, Hashemiah Almusawi
This review investigates the association between N-methyl-d-Aspartate receptor (NMDAR) hypofunction and somatostatin-expressing GABAergic interneurons (SST +) and how it contributes to the cognitive deficits observed in schizophrenia (SZ). This is based on evidence that NMDAR antagonists caused symptoms resembling SZ in healthy individuals. NMDAR hypofunction in GABAergic interneurons results in the modulation of the cortical network oscillation, particularly in the gamma range (30-80 Hz). These gamma-band oscillation (GBO) abnormalities were found to lead to the cognitive deficits observed in the disorder...
June 2017: Schizophrenia Research. Cognition
https://www.readbyqxmd.com/read/28739273/analysis-of-packing-microstructure-and-wall-effects-in-a-narrow-bore-ultrahigh-pressure-liquid-chromatography-column-using-focused-ion-beam-scanning-electron-microscopy
#7
Arved E Reising, Sabine Schlabach, Vasili Baranau, Daniela Stoeckel, Ulrich Tallarek
Column wall effects are well recognized as major limiting factor in achieving high separation efficiency in HPLC. This is especially important for modern analytical columns packed with small particles, where wall effects dominate the band broadening. Detailed knowledge about the packing microstructure of packed analytical columns has so far not been acquired. Here, we present the first three-dimensional reconstruction protocol for these columns utilizing focused ion-beam scanning electron microscopy (FIB-SEM) on a commercial 2...
July 14, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28739098/effects-of-bariatric-surgery-on-energy-homeostasis
#8
REVIEW
Wei Li, Denis Richard
Bariatric surgery represents the most efficient therapy for severe obesity. It reduces the size of fat stores or the amount of body fat gain. The bariatric surgery procedures currently used include Roux-en-Y gastric bypass and sleeve gastrectomy, which are the most commonly performed procedures. Other procedures are laparoscopic adjustable gastric banding and biliopancreatic diversion. The latter represents the most effective surgery for treatment of severe obesity as well as type 2 diabetes. Bariatric surgery reduces energy intake by restricting the size of the stomach reservoir and causing malabsorption, as in the case of biliopancreatic diversion...
August 2017: Canadian Journal of Diabetes
https://www.readbyqxmd.com/read/28738882/hemisphere-specific-eeg-related-to-alternate-nostril-yoga-breathing
#9
Shirley Telles, Ram Kumar Gupta, Arti Yadav, Shivangi Pathak, Acharya Balkrishna
BACKGROUND: Previously, forced unilateral nostril breathing was associated with ipsilateral, or contralateral cerebral hemisphere changes, or no change. Hence it was inconclusive. The present study was conducted on 13 normal healthy participants to determine the effects of alternate nostril yoga breathing on (a) cerebral hemisphere asymmetry, and (b) changes in the standard EEG bands. METHODS: Participants were randomly allocated to three sessions (a) alternate nostril yoga breathing (ANYB), (b) breath awareness and (c) quiet sitting, on separate days...
July 24, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28737499/tunable-indirect-direct-transition-of-few-layer-snse-via-interface-engineering
#10
Hansika Iroshini Sirikumara, Thushari Jayasekera
Tin Selenide (SnSe) is one of the best thermoelectric materials reported to date. The possibility of growing few-layer SnSe helped boost the interest in this long-known, earth abundant material. Pristine SnSe in bulk, mono- and few-layer forms are reported to have indirect electronic bandgaps. Possible indirect-direct transition in SnSe is attractive for its optoelectronic-related applications. Based on the results from first principles Density Functional Theory (DFT) calculations, we carefully analyzed electronic band structures of bulk, and bilayer SnSe with various interlayer stackings...
July 24, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28736049/development-of-a-new-approach-based-on-midwave-infrared-spectroscopy-for-post-consumer-black-plastic-waste-sorting-in-the-recycling-industry
#11
Offer Rozenstein, Eldon Puckrin, Jan Adamowski
Waste sorting is key to the process of waste recycling. Exact identification of plastic resin and wood products using Near Infrared (NIR, 1-1.7µm) sensing is currently in use. Yet, dark targets characterized by low reflectance, such as black plastics, are hard to identify by this method. Following the recent success of Midwave Infrared (MWIR, 3-12µm) measurements to identify coloured plastic polymers, the aim of this study was to assess whether this technique is applicable to sorting black plastic polymers and wood products...
July 20, 2017: Waste Management
https://www.readbyqxmd.com/read/28735199/one-pot-synthesis-of-bismuth-silicate-heterostructures-with-tunable-morphology-and-excellent-visible-light-photodegradation-performances
#12
Kun-Le Jia, Jin Qu, Shu-Meng Hao, Fei An, Ya-Qiong Jing, Zhong-Zhen Yu
Construction of a heterostructure to prolong the life of electron-hole pairs is a very important approach to endow it with excellent photodegradation performances. Particularly, one-pot synthesis of heterostructures with the same component but different crystal structures to form a proper band gap is still challenging. Herein, bismuth silicate (BSO) heterostructures are synthesized using a one-pot hydrothermal approach without adding any other inorganic components. The crystal phase, morphology, surface state, and photochemical properties of the BSO materials are precisely tuned to fabricate two kinds of bismuth silicate heterostructures: rod-like Bi2SiO5/Bi12SiO20 and flower-like Bi2SiO5/Bi4Si3O12 heterostructures...
July 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28734309/universal-two-dimensional-characteristics-in-perovskite-type-oxyhydrides-atio2h-a-li-na-k-rb-cs
#13
Nobuya Sato, Ryosuke Akashi, Shinji Tsuneyuki
A series of unsynthesized perovskite-type oxyhydrides ATiO2H (A = Li, Na, K, Rb, Cs) are investigated by the density functional calculations. These oxyhydrides are stable in the sense of the formation energies for some possible synthesis reactions. They are crystallized into quite similar crystal structures with the long c-axis, and the corner-sharing TiO4H2 octahedra of the ideal perovskite-type structure are deformed into the 5-fold coordinated titanium atoms with the OH plane and the apical oxygen atoms...
July 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28733663/electronic-structure-of-srsn2as2-near-the-topological-critical-point
#14
L-Y Rong, J-Z Ma, S-M Nie, Z-P Lin, Z-L Li, B-B Fu, L-Y Kong, X-Z Zhang, Y-B Huang, H-M Weng, T Qian, H Ding, R-Z Tai
Topological materials with exotic quantum properties are promising candidates for quantum spin electronics. Different classes of topological materials, including Weyl semimetal, topological superconductor, topological insulator and Axion insulator, etc., can be connected to each other via quantum phase transition. For example, it is believed that a trivial band insulator can be twisted into topological phase by increasing spin-orbital coupling or changing the parameters of crystal lattice. With the results of LDA calculation and measurement by angle-resolved photoemission spectroscopy (ARPES), we demonstrate in this work that the electronic structure of SrSn2As2 single crystal has the texture of band inversion near the critical point...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28733597/design-of-new-mott-multiferroics-via-complete-charge-transfer-promising-candidates-for-bulk-photovoltaics
#15
Hanghui Chen, Andrew Millis
Optimal materials to induce bulk photovoltaic effects should lack inversion symmetry and have an optical gap matching the energies of visible radiation. Ferroelectric perovskite oxides such as BaTiO3 and PbTiO3 exhibit substantial polarization and stability, but have the disadvantage of excessively large band gaps. We use both density functional theory and dynamical mean field theory calculations to design a new class of Mott multiferroics-double perovskite oxides A 2VFeO6 (A = Ba, Pb, etc). While neither perovskite AVO3 nor AFeO3 is ferroelectric, in the double perovskite A 2VFeO6 a 'complete' charge transfer from V to Fe leads to a non-bulk-like charge configuration-an empty V-d shell and a half-filled Fe-d shell, giving rise to a polarization comparable to that of ferroelectric ATiO3...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28732969/suspension-characteristics-of-water-droplet-in-oil-under-ultrasonic-standing-waves
#16
Xiaoming Luo, Juhang Cao, Jing Ren, Haipeng Yan, Limin He
The suspension characteristics of water droplet in oil were investigated under ultrasonic standing waves with high-speed photography in this paper. Firstly, the suspension position of droplet was predicted by theoretical derivation. The motion trajectory of droplet was captured and a kinetic analysis was applied to characterize the suspension position of droplet. The effects of droplet size, acoustic pressure, frequency, as well as density ratio of water and oil on the suspension position of droplet were analyzed in details...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732761/the-use-of-intermuscular-coherence-analysis-as-a-novel-approach-to-detect-age-related-changes-on-postural-muscle-synergy
#17
Adriana M Degani, Charles T Leonard, Alessander Danna-Dos-Santos
The overall goal of this study was to investigate potential adaptations brought about by the natural processes of aging on the coordination of postural muscles. Considering the progressive and non-homogeneous deterioration of sensorimotor and neuromuscular systems as the individual grows older, it was hypothesized that aging is associated with a reorganization of synergistic mechanisms controlling postural muscles. Therefore, the presence, distribution, and strength of correlated neural inputs to three posterior postural muscles were measured by intermuscular coherence estimations at a low frequency band (0-55Hz)...
July 18, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28732445/photoelectron-spectroscopy-study-of-quinonimides
#18
Ekram Hossain, Shihu M Deng, Samer Gozem, Anna I Krylov, Xue-Bin Wang, Paul G Wenthold
Structures and energetics of o-, m- and p-quinonimide anions (OC6H4N) and quinoniminyl radicals have been investigated by using negative ion photoelectron spectroscopy. Modeling of the photoelectron spectrum of the ortho isomer shows that the ground state of the anion is a triplet, while the quinoniminyl radical has a doublet ground state with a doublet-quartet splitting of 35.5 kcal/mol. The para radical has doublet ground state, but a band for a quartet state is missing from the photoelectron spectrum indicating that the anion has a singlet ground state, in contrast to previously reported calculations...
July 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28732280/evaluation-of-a-novel-median-power-spectrogram-for-seizure-detection-by-non-neurophysiologists
#19
Peter Yan, Tamar Melman, Sherry Yan, Munkhzul Otgonsuren, Zachary Grinspan
PURPOSE: (1) To evaluate how well resident physicians use a novel EEG spectral analysis tool (the median power spectrogram; MPS) to detect seizures. (2) To assess the capability of the MPS to identify different seizure types. METHODS: 120 EEG records from children with intractable seizures were converted to MPS by taking the median power across leads and using multi-taper spectral estimation. Twelve blinded neurology residents were trained to interpret the spectrogram with a five-minute video tutorial and post-test...
June 15, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28731769/first-principles-prediction-of-spin-polarized-multiple-dirac-rings-in-manganese-fluoride
#20
Yalong Jiao, Fengxian Ma, Chunmei Zhang, John Bell, Stefano Sanvito, Aijun Du
Spin-polarized materials with Dirac features have sparked great scientific interest due to their potential applications in spintronics. But such a type of structure is very rare and none has been fabricated. Here, we investigate the already experimentally synthesized manganese fluoride (MnF_{3}) as a novel spin-polarized Dirac material by using first-principles calculations. MnF_{3} exhibits multiple Dirac cones in one spin orientation, while it behaves like a large gap semiconductor in the other spin channel...
July 7, 2017: Physical Review Letters
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