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https://www.readbyqxmd.com/read/28644555/a-self-assembled-trigonal-prismatic-molecular-vessel-for-catalytic-dehydration-reactions-in-water
#1
Partha Sarathi Mukherjee, Paramita Das, Atul Kumar, Prodip Howlader
A water-soluble Pd6 trigonal prism (A) was synthesized by two-component coordination-driven self-assembly of a Pd(II) 90° acceptor with a tetraimidazole donor. As the walls of the prism are constructed by three conjugated aromatic building blocks, the confined pocket of the prism is hydrophobic. In addition to the hydrophobic cavity, large product egress windows make A an ideal molecular vessel to catalyze otherwise challenging pseudo multicomponent dehydration reactions in its confined nanospace in aqueous medium...
June 23, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28642090/temporary-removal-vaginal-sacral-colpopexy-a-natural-orifice-approach-to-a-gold-standard-procedure
#2
Charles R Hanes
The publisher regrets that this article has been temporarily removed. A replacement will appear as soon as possible in which the reason for the removal of the article will be specified, or the article will be reinstated. The full Elsevier Policy on Article Withdrawal can be found at https://www.elsevier.com/about/our-business/policies/article-withdrawal.
June 20, 2017: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/28641244/computerized-lung-sound-screening-for-pediatric-auscultation-in-noisy-field-environments
#3
Dimitra Emmanouilidou, Eric D McCollum, Daniel E Park, Mounya Elhilali
GOAL: Chest auscultations offer a non-invasive and low-cost tool for monitoring lung disease. However, they present many shortcomings including inter-listener variability, subjectivity, and vulnerability to noise and distortions. The current work proposes a computer-aided approach to process lung signals acquired in the field under adverse noisy conditions, by improving the signal quality and offering automated iden- tification of abnormal auscultations indicative of respiratory pathologies...
June 19, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28640294/space-confined-synthesis-of-multilayer-cu-n-doped-graphene-nanosheets-for-efficient-oxygen-electroreduction
#4
Yangyang Ni, Zhengyan Chen, Fantao Kong, Yu Qiao, Aiguo Kong, Yongkui Shan
Cu-based carbon electrocatalysts for the oxygen reduction reaction are difficult to compare with the corresponding Fe- or Co-based electrocatalytic materials, owing to their insufficient catalytic activity and stability. Herein, as an impressive Cu-based electrocatalyst, a multilayer Cu-N-doped graphene sheet (Cu-N-GR) is directly synthesized by the thermal conversion of copper(ii) 2,2'-bipyridine in the confined space of lamellar montmorillonites. The open layered morphology of Cu-N-GR materials facilitated the exposure of more active centers and enhanced the flexibility and mobility of charge carriers...
June 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28640260/microscopy-of-the-interacting-harper-hofstadter-model-in-the-two-body-limit
#5
M Eric Tai, Alexander Lukin, Matthew Rispoli, Robert Schittko, Tim Menke, Dan Borgnia, Philipp M Preiss, Fabian Grusdt, Adam M Kaufman, Markus Greiner
The interplay between magnetic fields and interacting particles can lead to exotic phases of matter that exhibit topological order and high degrees of spatial entanglement. Although these phases were discovered in a solid-state setting, recent innovations in systems of ultracold neutral atoms-uncharged atoms that do not naturally experience a Lorentz force-allow the synthesis of artificial magnetic, or gauge, fields. This experimental platform holds promise for exploring exotic physics in fractional quantum Hall systems, owing to the microscopic control and precision that is achievable in cold-atom systems...
June 21, 2017: Nature
https://www.readbyqxmd.com/read/28629365/evaluation-and-improvement-of-the-regulatory-inference-for-large-co-expression-networks-with-limited-sample-size
#6
Wenbin Guo, Cristiane P G Calixto, Nikoleta Tzioutziou, Ping Lin, Robbie Waugh, John W S Brown, Runxuan Zhang
BACKGROUND: Co-expression has been widely used to identify novel regulatory relationships using high throughput measurements, such as microarray and RNA-seq data. Evaluation studies on co-expression network analysis methods mostly focus on networks of small or medium size of up to a few hundred nodes. For large networks, simulated expression data usually consist of hundreds or thousands of profiles with different perturbations or knock-outs, which is uncommon in real experiments due to their cost and the amount of work required...
June 19, 2017: BMC Systems Biology
https://www.readbyqxmd.com/read/28626933/conductive-carbon-nitride-for-excellent-energy-storage
#7
Jijian Xu, Feng Xu, Meng Qian, Fangfang Xu, Zhanglian Hong, Fuqiang Huang
Conductive carbon nitride, as a hypothetical carbon material demonstrating high nitrogen doping, high electrical conductivity, and high surface area, has not been fabricated. A major challenge towards its fabrication is that high conductivity requires high temperature synthesis, but the high temperature eliminates nitrogen from carbon. Different from conventional methods, a facile preparation of conductive carbon nitride from novel thermal decomposition of nickel hydrogencyanamide in a confined space is reported...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28618638/localized-dark-solitons-and-vortices-in-defocusing-media-with-spatially-inhomogeneous-nonlinearity
#8
Jianhua Zeng, Boris A Malomed
Recent studies have demonstrated that defocusing cubic nonlinearity with local strength growing from the center to the periphery faster than r^{D}, in space of dimension D with radial coordinate r, supports a vast variety of robust bright solitons. In the framework of the same model, but with a weaker spatial-growth rate ∼r^{α} with α≤D, we test here the possibility to create stable localized continuous waves (LCWs) in one-dimensional (1D) and 2D geometries, localized dark solitons (LDSs) in one dimension, and localized dark vortices (LDVs) in two dimensions, which are all realized as loosely confined states with a divergent norm...
May 2017: Physical Review. E
https://www.readbyqxmd.com/read/28617250/confinement-of-carbon-nanotube-enabled-multi-strand-helices-of-polyacetylenes
#9
Yunfang Li, Wei-Tao Lu, Hongjin Fu, Xiaolin Zhao, Shuqiong Xu
Molecular dynamics simulations demonstrate that several polyacetylene (PA) chains can encapsulate and self-assemble into multi-stranded helical structures in confined inner space of carbon nanotubes (SWCNT). The driving van der Waals force and curvature provided by tube wall enable polymers to bend and spiral to maximize the π-π stacking area with tube wall when filling inside SWCNT. Structural forms and knitting pattern of multiple helices are influenced by the combined effect of tube space, number of PA chains and temperature...
June 15, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28617249/in-situ-biosynthesis-of-ultrafine-metal-nanoparticles-within-metal-organic-framework-for-efficient-heterogeneous-catalysis
#10
Tang Lei, Jiafu Shi, Hong Wu, Shaohua Zhang, Hua Liu, Hongjian Zou, Yizhou Wu, Jingjing Zhao, Zhongyi Jiang
The synthesis of ultrafine, uniform, well-dispersed functional nanoparticles (NPs) under mild conditions in a controlled manner remains a great challenge. In biological systems, a well-defined biomineralization process is exploited, in which the control over NPs size, shape and distribution is temporally and spatially regulated by a variety of biomolecules in a confined space. Inspired by this, we embedded proteins into metal-organic frameworks (MOFs) and explored a novel approach to synthesize metallic NPs by taking the synergy of protein-induced biomineralization process and space-confined effect of MOFs...
June 15, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28609892/reappraisal-of-i-synagrops-i-g%C3%A3-nther-1887-with-rehabilitation-and-revision-of-i-parascombrops-i-alcock-1889-including-description-of-seven-new-species-and-two-new-genera-perciformes-acropomatidae
#11
Werner W Schwarzhans, Artem M Prokofiev
An ongoing review of the fishes of the basal percoid family Acropomatidae has revealed that the genus Synagrops Günther, 1887 as it is currently understood is not a natural group. Species with a serrated pelvic-fin spine are here placed in the resurrected genus Parascombrops Alcock, 1889 (type-species: Parascombrops pellucidus Alcock, 1889), and the new, monospecific genus Caraibops n. gen. (type-species: Synagrops trispinosus Mochizuki & Sano, 1984). Parascombrops is unique amongst Acropomatidae in the combination of the presence of vacant 8th interneural space, a predorsal formula /0+0/0+2/ and an epaxialis attachment type 1...
May 4, 2017: Zootaxa
https://www.readbyqxmd.com/read/28605183/directed-self-assembly-of-colloidal-particles-onto-nematic-liquid-crystalline-defects-engineered-by-chemically-patterned-surfaces
#12
Xiao Li, Julio C Armas-Pérez, Juan P Hernández-Ortiz, Christopher G Arges, Xiaoying Liu, José A Martínez-González, Leonidas E Ocola, Camille Bishop, Helou Xie, Juan J de Pablo, Paul F Nealey
In exploiting topological defects of liquid crystals as the targeting sites for trapping colloidal objects, previous work has relied on topographic features with uniform anchoring to create defects, achieving limited density and spacing of particles. We report a generalizable strategy to create topological defects on chemically patterned surfaces to assemble particles in precisely defined locations with a tunable interparticle distance at nanoscale dimensions. Informed by experimental observations and numerical simulations that indicate that liquid crystals, confined between a homeotropic-anchoring surface and a surface with lithographically defined planar-anchoring stripes in a homeotropic-anchoring background, display splay-bend deformation, we successfully create pairs of defects and subsequently trap particles with controlled spacing by designing patterns of intersecting stripes aligned at 45° with homeotropic-anchoring gaps at the intersections...
June 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/28604671/hierarchical-porous-carbons-with-layer-by-layer-motif-architectures-from-confined-soft-template-self-assembly-in-layered-materials
#13
Jie Wang, Jing Tang, Bing Ding, Victor Malgras, Zhi Chang, Xiaodong Hao, Ya Wang, Hui Dou, Xiaogang Zhang, Yusuke Yamauchi
Although various two-dimensional (2D) nanomaterials have been explored as promising capacitive materials due to their unique layered structure, their natural restacking tendency impedes electrolyte transport and significantly restricts their practical applications. Herein, we synthesize all-carbon layer-by-layer motif architectures by introducing 2D ordered mesoporous carbons (OMC) within the interlayer space of 2D nanomaterials. As a proof of concept, MXenes are selected as 2D hosts to design 2D-2D heterostructures...
June 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28598658/long-range-repulsion-between-spatially-confined-van-der-waals-dimers
#14
Mainak Sadhukhan, Alexandre Tkatchenko
It is an undisputed textbook fact that nonretarded van der Waals (vdW) interactions between isotropic dimers are attractive, regardless of the polarizability of the interacting systems or spatial dimensionality. The universality of vdW attraction is attributed to the dipolar coupling between fluctuating electron charge densities. Here, we demonstrate that the long-range interaction between spatially confined vdW dimers becomes repulsive when accounting for the full Coulomb interaction between charge fluctuations...
May 26, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28598441/controlling-hybrid-nonlinearities-in-transparent-conducting-oxides-via-two-colour-excitation
#15
M Clerici, N Kinsey, C DeVault, J Kim, E G Carnemolla, L Caspani, A Shaltout, D Faccio, V Shalaev, A Boltasseva, M Ferrera
Nanophotonics and metamaterials have revolutionized the way we think about optical space (ɛ,μ), enabling us to engineer the refractive index almost at will, to confine light to the smallest of the volumes, and to manipulate optical signals with extremely small footprints and energy requirements. Significant efforts are now devoted to finding suitable materials and strategies for the dynamic control of the optical properties. Transparent conductive oxides exhibit large ultrafast nonlinearities under both interband and intraband excitations...
June 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28591599/dna-internal-motion-likely-accelerates-protein-target-search-in-a-packed-nucleoid
#16
Edmond Chow, Jeffrey Skolnick
Transcription factors must diffuse through densely packed and coiled DNA to find their binding sites. Using a coarse-grained model of DNA and lac repressor (LacI) in the Escherichia coli nucleoid, simulations were performed to examine how LacI diffuses in such a space. Despite the canonical picture of LacI diffusing rather freely, in reality the DNA is densely packed, is not rigid but highly mobile, and the dynamics of DNA dictates to a great extent the LacI motion. A possibly better picture of unbound LacI motion is that of gated diffusion, where DNA confines LacI in a cage, but LacI can move between cages when hindering DNA strands move out of the way...
June 6, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28590837/regulation-and-measurement-of-the-heat-generated-by-automatic-tooth-preparation-in-a-confined-space
#17
Fusong Yuan, Jianqiao Zheng, Yuchun Sun, Yong Wang, Peijun Lyu
OBJECTIVE: The aim of this study was to assess and regulate heat generation in the dental pulp cavity and circumambient temperature around a tooth during laser ablation with a femtosecond laser in a confined space. BACKGROUND DATA: The automatic tooth preparing technique is one of the traditional oral clinical technology innovations. In this technique, a robot controlled an ultrashort pulse laser to automatically complete the three-dimensional teeth preparing in a confined space...
June 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28590754/multilevel-approaches-within-the-local-pair-natural-orbital-framework
#18
Manuel Sparta, Marius Retegan, Peter Pinski, Christoph Riplinger, Ute Becker, Frank Neese
The linear-scaling local coupled cluster method DLPNO-CCSD(T) allows calculations on systems containing hundreds of atoms to be performed while reproducing canonical CCSD(T) energies typically with chemical accuracy (< 1 kcal/mol). The accuracy of the method is determined by two main truncation thresholds that control the number of electron pairs included in the CCSD iterations and the size of the pair natural orbital virtual space for each electron pair, respectively. While the results of DLPNO-CCSD(T) calculations converge smoothly towards their canonical counterparts as the thresholds are tightened, the improved accuracy is accompanied by a fairly steep increase of the computational cost...
June 7, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28589933/towards-colloidal-spintronics-through-rashba-spin-orbit-interaction-in-lead-sulphide-nanosheets
#19
Mohammad Mehdi Ramin Moayed, Thomas Bielewicz, Martin Sebastian Zöllner, Carmen Herrmann, Christian Klinke
Employing the spin degree of freedom of charge carriers offers the possibility to extend the functionality of conventional electronic devices, while colloidal chemistry can be used to synthesize inexpensive and tunable nanomaterials. Here, in order to benefit from both concepts, we investigate Rashba spin-orbit interaction in colloidal lead sulphide nanosheets by electrical measurements on the circular photo-galvanic effect. Lead sulphide nanosheets possess rock salt crystal structure, which is centrosymmetric...
June 7, 2017: Nature Communications
https://www.readbyqxmd.com/read/28585519/tailoring-%C3%A2-graphene-layer-to-layer-growth
#20
Yongtao Li, Bin Wu, Wei Guo, Lifeng Wang, Jingbo Li, Yunqi Liu
A layered material grown between a substrate and the upper layer involves complex interactions and a confined reaction space, representing an unusual growth mode. Here, we show multi-layer graphene domains grown on liquid or solid Cu by the chemical vapor deposition method via this 'double-substrate' mode. We demonstrate the interlayer-induced coupling effect on the twist angle in bi- and multi-layer graphene. We discover dramatic growth disunity for different graphene layers, which is explained by the ideas of a chemical 'gate' and a material transport process within a confined space...
June 6, 2017: Nanotechnology
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