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Chanapai Chaiyakulsil, Marut Chantra, Poomiporn Katanyuwong, Anant Khositseth, Nattachai Anantasit
INTRODUCTION: Hemodynamic parameters measurements were widely conducted using pulmonary artery catheter (PAC) with thermodilution as a reference standard. Due to its technical difficulties in children, transthoracic echocardiography (TTE) has been widely employed instead. Nonetheless, TTE requires expertise and is time-consuming. Noninvasive cardiac output monitoring such as ultrasonic cardiac output monitor (USCOM) and electrical velocimetry (EV) can be performed rapidly with less expertise requirement...
2018: PloS One
Jea Woong Jo, Jongmin Choi, F Pelayo Garcia de Arquer, Ali Seifitokaldani, Bin Sun, Younghoon Kim, Hyungju Ahn, James Z Fan, Rafael Quintero-Bermudez, Junghwan Kim, Min-Jae Choi, Se-Woong Baek, Andrew H Proppe, Grant Walters, Dae-Hyun Nam, Shana O Kelley, Sjoerd Hoogland, Oleksandr Voznyy, Edward H Sargent
Colloidal quantum dots (CQDs) are promising solution-processed infrared-absorbing materials for optoelectronics. In these applications, it is crucial to replace the electrically insulating ligands used in synthesis in order to form strongly-coupled quantum dot solids. Recently, solution-phase ligand exchange strategies have been reported that minimize the density of defects and the polydispersity of CQDs; however, we find herein that the new ligands exhibit insufficient chemical reactivity to remove original oleic acid ligands completely...
June 18, 2018: Nano Letters
Kiminori Sato
In solid-like polymer electrolytes, salt precipitation (SP) followed by the occurrence of neutral ion pairs in polymer electrolytes is known to deteriorate ionic conductivity, but has not been the subject of intense study so far. Here, the mechanism of SP is studied for the polymer electrolyte consisting of poly(ethylene oxide) (PEO) and ionic liquid (IL) salt of 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMImTf), which is one of the promising prototype systems due to its technological relevance...
June 18, 2018: Journal of Physical Chemistry. B
Matin Amani, Chaoliang Tan, George Zhang, Chunsong Zhao, James Bullock, Xiaohui Song, Hyungjin Kim, Vivek Raj Shrestha, Yang Gao, Kenneth B Crozier, Mary Scott, Ali Javey
Two-dimensional (2D) materials, particularly black phosphorous (bP), have demonstrated themselves to be excellent candidates for high-performance infrared photodetectors and transistors. However, high-quality bP can be only obtained via mechanical exfoliation from high temperature- and high-pressure-grown bulk crystals and degrades rapidly when exposed to ambient conditions. Here, we report solution-synthesized and air-stable quasi-2D tellurium (Te) nanoflakes for short-wave infrared (SWIR) photodetectors. We perform comprehensive optical characterization via polarization-resolved transmission and reflection measurements, and report the absorbance and complex refractive index of Te crystals...
June 18, 2018: ACS Nano
Di-Ming Chen, Chun-Xiao Sun, Chun-Sen Liu, Miao Du
Metal-organic frameworks (MOFs) have gained tremendous attention in the fields of environmental restoration and sustainable energy for their potential use as photocatalyst. Herein, a new two-dimensional (2D) Cu(I)-based MOF material showing a narrow forbidden-band of 2.13 eV was successfully constructed using a visible-light-harvesting anthracene-based bipyridine ligand. The as-prepared MOF demonstrates high chemical stability and could be stable in the pH range 2-13, which is favorable for its potential application in photocatalysis...
June 18, 2018: Inorganic Chemistry
Yi-Fan Yang, Shachar Klaiman, Evgeniy V Gromov, Lorenz S Cederbaum
We report on high-level coupled-cluster calculations for the anion states of the smallest fullerene C20. Using the state-of-the-art EA-EOM-CCSD method we revealed that the C20- anion has five bound electronic states at the C20 neutral ground-state D3d equilibrium configuration. These are two pairs of 2Eu and 2A2u states and one 2A1g state. The binding energies vary from 2.05 eV for the most bound 2Eu state to <1 meV for the 2A1g state. An analysis in terms of radial and angular density distribution of the excess electron revealed that the two 2Eu/2A2u pairs are valence-like states while 2A1g corresponds to a super-atomic-like (SAMO) state...
June 18, 2018: Physical Chemistry Chemical Physics: PCCP
Jie Yang, Mohammad Afsar Uddin, Yumin Tang, Yulun Wang, Yang Wang, Huimin Su, Rutian Gao, Zhi-Kuan Chen, Junfeng Dai, Han Young Woo, Xugang Guo
We present here a series of wide band gap (Eg: > 1.8 eV) polymer donors by incorporating thiophene-flanked phenylene as electron-donating unit and quinoxaline as electron-accepting co-unit to attain large open-circuit voltages (Vocs) and short-circuit currents (Jscs) in non-fullerene organic solar cells (OSCs). Fluorination was utilized to fine-tailor the energetics of polymer frontier molecular orbitals (FMOs) by replacing a variable number of H atoms on the phenylene moiety with F. It was found that fluorination can effectively modulate polymer backbone planarity through intramolecular noncovalent S…F and/or H…F interactions...
June 18, 2018: ACS Applied Materials & Interfaces
Quanguo Jiang, Jianfeng Zhang, Zhimin Ao, Huajie Huang, Haiyan He, Yuping Wu
The CO oxidation mechanism on graphene with divacancy (DG) embedded with transition metal from Sc to Zn has been studied by using first principles calculations. The results indicate that O2 molecule is preferentially adsorbed on Sc, Ti, V, Cr, Mn, and Fe-DG, which can avoid the CO poisoning problem that many catalysts facing and is beneficial to the CO oxidation progress. Further study indicates that Mn-DG shows the best catalytic properties for CO oxidation with consideration of both Langmuir-Hinshelwood (LH) and Eley-Rideal (ER) oxidation mechanisms...
2018: Frontiers in Chemistry
Sydney Leach, Nykola C Jones, Søren Vrønning Hoffmann, Sun Un
The absorption spectrum of quinoline was measured in the gas phase between 3.5 and 10.7 eV using a synchrotron photon source. A large number of sharp and broad spectral features were observed, some of which have plasmon-type collective π-electron modes contributing to their intensities. Eight valence electronic transitions were assigned, considerably extending the number of π-π* transitions previously observed mainly in solution. The principal factor in solution red-shifts is found to be the Lorentz-Lorenz polarizability parameter...
June 16, 2018: Journal of Physical Chemistry. A
Rui Peng, Yandong Ma, Shuai Zhang, Baibiao Huang, Ying Dai
Two-dimensional valleytronic systems can provide information storage and processing advantages that complement or surpass those of conventional charge- and spin-based semiconductor technologies. The major challenge currently is to realize valley polarization for manipulating the valley degree of freedom. Here, we propose that valley polarization can be readily achieved in Janus single-layer MoSSe through magnetic doping, which is highly feasible in experiment. Due to inversion symmetry breaking combined with strong spin-orbit coupling (SOC), the pure single-layer MoSSe harbors an intriguing multivalleyed band structure and strong coupled spin and valley physics...
June 19, 2018: Journal of Physical Chemistry Letters
Junyi Xin, Haiyan Chu, Shuai Ben, Yuqiu Ge, Wei Shao, Yang Zhao, Yongyue Wei, Gaoxiang Ma, Shuwei Li, Dongying Gu, Zhengdong Zhang, Mulong Du, Meilin Wang
Currently, genetic risk score (GRS) model has been a widely used method to evaluate the genetic effect of cancer risk prediction, but seldom studies investigated their discriminatory power, especially for colorectal cancer (CRC) risk prediction. In this study, we applied both simulation and real data to comprehensively compare the discriminability of different GRS models. The GRS models were fitted by logistic regression with three scenarios, including simple count GRS (SC-GRS), logistic regression weighted GRS (LR-GRS, including DL-GRS and OR-GRS) and explained variance weighted GRS (EV-GRS, including EV_DL-GRS and EV_OR-GRS) models...
June 13, 2018: Gene
Paul A Lapchak, Paul D Boitano, Geoffrey de Couto, Eduardo Marbán
Acute ischemic stroke is devastating to patients and their families because of few viable therapeutic options to promote recovery after reperfusion windows close. Recent breakthroughs in biotechnology have resulted in a reproducible patented process for the purification of extracellular vesicles (EVs) from human cardiosphere-derived cells (CDCs). Because CDC-EVs have many features potentially beneficial to treat acute ischemic stroke, CDC-EVs were evaluated in an established small-clot rabbit embolic stroke model, where clinically relevant end points were used to assess recovery in a more translational large animal model...
June 13, 2018: Experimental Neurology
Bipin Kumar Gupta, Rabia Sultana, Satbir Singh, Vijeta Singh, Geet Awana, Anurag Gupta, Bahadur Singh, A K Srivastava, O N Srivastava, S Auluck, V P S Awana
We report the exotic photoluminescence (PL) behaviour of 3D topological insulator Bi2 Te3 single crystals grown by customized self-flux method and mechanically exfoliated few layers (18 ± 2 nm)/thin flakes obtained by standard scotch tape method from as grown Bi2 Te3 crystals. The experimental PL studies on bulk single crystal and mechanically exfoliated few layers of Bi2 Te3 evidenced a broad red emission in the visible region from 600-690 nm upon 375 nm excitation wavelength corresponding to optical band gap of 2 eV...
June 15, 2018: Scientific Reports
Waqas Muhammad Usman, Tin Chanh Pham, Yuk Yan Kwok, Luyen Tien Vu, Victor Ma, Boya Peng, Yuen San Chan, Likun Wei, Siew Mei Chin, Ajijur Azad, Alex Bai-Liang He, Anskar Y H Leung, Mengsu Yang, Ng Shyh-Chang, William C Cho, Jiahai Shi, Minh T N Le
Most of the current methods for programmable RNA drug therapies are unsuitable for the clinic due to low uptake efficiency and high cytotoxicity. Extracellular vesicles (EVs) could solve these problems because they represent a natural mode of intercellular communication. However, current cellular sources for EV production are limited in availability and safety in terms of horizontal gene transfer. One potentially ideal source could be human red blood cells (RBCs). Group O-RBCs can be used as universal donors for large-scale EV production since they are readily available in blood banks and they are devoid of DNA...
June 15, 2018: Nature Communications
Sander C Steenbeek, Thang V Pham, Joep de Ligt, Anoek Zomer, Jaco C Knol, Sander R Piersma, Tim Schelfhorst, Rick Huisjes, Raymond M Schiffelers, Edwin Cuppen, Connie R Jimenez, Jacco van Rheenen
Recent data showed that cancer cells from different tumor subtypes with distinct metastatic potential influence each other's metastatic behavior by exchanging biomolecules through extracellular vesicles (EVs). However, it is debated how small amounts of cargo can mediate this effect, especially in tumors where all cells are from one subtype, and only subtle molecular differences drive metastatic heterogeneity. To study this, we have characterized the content of EVs shed in vivo by two clones of melanoma (B16) tumors with distinct metastatic potential...
June 14, 2018: EMBO Journal
Marc P Coons, John M Herbert
Widely used continuum solvation models for electronic structure calculations, including popular polarizable continuum models (PCMs), usually assume that the continuum environment is isotropic and characterized by a scalar dielectric constant, ε. This assumption is invalid at a liquid/vapor interface or any other anisotropic solvation environment. To address such scenarios, we introduce a more general formalism based on solution of Poisson's equation for a spatially varying dielectric function, ε(r). Inspired by nonequilibrium versions of PCMs, we develop a similar formalism within the context of Poisson's equation that includes the out-of-equilibrium dielectric response that accompanies a sudden change in the electron density of the solute, such as that which occurs in a vertical ionization process...
June 14, 2018: Journal of Chemical Physics
Jessalyn A DeVine, Ali Abou Taka, Mark C Babin, Marissa L Weichman, Hrant P Hratchian, Daniel M Neumark
Slow electron velocity-map imaging spectroscopy of cryogenically cooled TiO3 H2 - anions is used to probe the simplest titania/water reaction, TiO2 0/- + H2 O. The resultant spectra show vibrationally resolved structure assigned to detachment from the cis-dihydroxide TiO(OH)2 - geometry based on density functional theory calculations, demonstrating that for the reaction of the anionic TiO2 - monomer with a single water molecule, the dissociative adduct (where the water is split) is energetically preferred over a molecularly adsorbed geometry...
June 14, 2018: Journal of Chemical Physics
C E Starrett
Modeling high-temperature (tens or hundreds of eV), dense plasmas is challenging due to the multitude of non-negligible physical effects including significant partial ionization and multisite effects. These effects cause the breakdown or intractability of common methods and approximations used at low temperatures, such as pseudopotentials or plane-wave basis sets. Here we explore the Korringa-Kohn-Rostoker Green's function method at these high-temperature conditions. The method is all electron, does not rely on pseudopotentials, and uses a spherical harmonic basis set, and so avoids the aforementioned limitations...
May 2018: Physical Review. E
Travis Sjostrom, Scott Crockett
Through quantum molecular dynamics (QMD), utilizing both Kohn-Sham (orbital-based) and orbital-free density functional theory, we calculate the equation of state of warm dense iron in the density range 7-30g/cm^{3} and temperatures from 1 to 100 eV. A critical examination of the iron pseudopotential is made, from which we find a significant improvement at high pressure to the previous QMD calculations of Wang et al. [Phys. Rev. E 89, 023101 (2014)10.1103/PhysRevE.89.023101]. Our results also significantly extend the ranges of density and temperature that were attempted in that prior work...
May 2018: Physical Review. E
H Saari, E Lisitsyna, K Rautaniemi, T Rojalin, L Niemi, O Nivaro, T Laaksonen, M Yliperttula, E Vuorimaa-Laukkanen
In response to physiological and artificial stimuli, cells generate nano-scale extracellular vesicles (EVs) by encapsulating biomolecules in plasma membrane-derived phospholipid envelopes. These vesicles are released to bodily fluids, hence acting as powerful endogenous mediators in intercellular signaling. EVs provide a compelling alternative for biomarker discovery and targeted drug delivery, but their kinetics and dynamics while interacting with living cells are poorly understood. Here we introduce a novel method, fluorescence lifetime imaging microscopy (FLIM) to investigate these interaction attributes...
June 12, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
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