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https://www.readbyqxmd.com/read/28106983/two-dimensional-sns-a-phosphorene-analogue-with-strong-in-plane-electronic-anisotropy
#1
Zhen Tian, Chenglei Guo, Mingxing Zhao, Ranran Li, Jiamin Xue
We study the anisotropic electronic properties of two-dimensional (2D) SnS, an analogue of phosphorene, grown by physical vapor transport. With transmission electron microscope and polarized Raman spectroscopy, we identify the zigzag and armchair directions of the as-grown 2D crystals. 2D SnS field-effect transistors with a cross-Hall-bar structure are fabricated. They show heavily hole-doped (~10(19) cm(-3)) conductivity with strong in-plane anisotropy. At room temperature the mobility along the zigzag direction exceeds 20 cm(2)V(-1)s(-1), which can be up to 1...
January 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28098209/crystal-growth-of-dirac-semimetal-zrsis-with-high-magnetoresistance-and-mobility
#2
Raman Sankar, G Peramaiyan, I Panneer Muthuselvam, Christopher J Butler, Klauss Dimitri, Madhab Neupane, G Narsinga Rao, M-T Lin, F C Chou
High quality single crystal ZrSiS as a theoretically predicted Dirac semimetal has been grown successfully using a vapor phase transport method. The single crystals of tetragonal structure are easy to cleave into perfect square-shaped pieces due to the van der Waals bonding between the sulfur atoms of the quintuple layers. Physical property measurement results including resistivity, Hall coefficient (RH), and specific heat are reported. The transport and thermodynamic properties suggest a Fermi liquid behavior with two Fermi pockets at low temperatures...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28094957/spatially-resolved-imaging-on-photocarrier-generations-and-band-alignments-at-perovskite-pbi2-hetero-interfaces-of-perovskite-solar-cells-by-light-modulated-scanning-tunneling-microscopy
#3
Min-Chuan Shih, Shao-Sian Li, Cheng-Hua Hsieh, Ying-Chiao Wang, Hung-Duen Yang, Ya-Ping Chiu, Chia-Seng Chang, Chun-Wei Chen
The presence of the PbI2 passivation layers at perovskite crystal grains has been found to con-siderably affect the charge carrier transport behaviors and device performance of perovskite so-lar cells. This work demonstrates the application of a novel light-modulated scanning tunneling microscopy (LM-STM) technique to reveal the interfacial electronic structures at the hetero-interfaces between CH3NH3PbI3 perovskite crystals and PbI2 passivation layer of individual perovskite grains under light illumination...
January 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/28091545/improvement-of-thermoelectric-properties-and-their-correlations-with-electron-effective-mass-in-cu1-98sxse1-x
#4
Lanling Zhao, Frank Yun Fei, Jun Wang, Funing Wang, Chunlei Wang, Jichao Li, Jiyang Wang, Zhenxiang Cheng, Shixue Dou, Xiaolin Wang
Sulphur doping effects on the crystal structures, thermoelectric properties, density-of-states, and effective mass in Cu1.98SxSe1-x were studied based on the electrical and thermal transport property measurements, and first-principles calculations. The X-ray diffraction patterns and Rietveld refinements indicate that room temperature Cu1.98SxSe1-x (x = 0, 0.02, 0.08, 0.16) and Cu1.98SxSe1-x (x = 0.8, 0.9, 1.0) have the same crystal structure as monoclinic-Cu2Se and orthorhombic-Cu2S, respectively. Sulphur doping can greatly enhance zT values when x is in the range of 0...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28079199/structural-influence-of-proteins-upon-adsorption-to-mos2-nanomaterials-comparison-of-mos2-force-field-parameters
#5
Zonglin Gu, Phil De Luna, Zaixing Yang, Ruhong Zhou
Molybdenum disulfide (MoS2) has recently emerged as a promising nanomaterial in a wide range of applications due to its unique and impressive properties. For example, MoS2 has gained attention in the biomedical field because of its ability to act as an antibacterial and anticancer agent. However, the potential influence of this exciting nanomaterial on biomolecules is yet to be extensively studied. Molecular dynamics (MD) simulations are invaluable tools in the examination of protein interactions with nanomaterials such as MoS2...
January 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28079027/the-properties-of-ultrapure-delafossite-metals
#6
A P Mackenzie
Although they were first synthesized in chemistry laboratories nearly fifty years ago, the physical properties of the metals PdCoO2, PtCoO2 and PdCrO2 have only more recently been studied in detail. The delafossite structure contains triangular co-ordinated atomic layers, and electrical transport in the delafossite metals is strongly 2D. Their most notable feature is their in-plane conductivity, which is amazingly high for oxide metals. At room temperature, the conductivity of non-magnetic PdCoO2 and PtCoO2 is higher per carrier than those of any alkali metal and even the most conductive elements, copper and silver...
January 12, 2017: Reports on Progress in Physics
https://www.readbyqxmd.com/read/28077872/structural-basis-for-nutrient-acquisition-by-dominant-members-of-the-human-gut-microbiota
#7
Amy J Glenwright, Karunakar R Pothula, Satya P Bhamidimarri, Dror S Chorev, Arnaud Baslé, Susan J Firbank, Hongjun Zheng, Carol V Robinson, Mathias Winterhalter, Ulrich Kleinekathöfer, David N Bolam, Bert van den Berg
The human large intestine is populated by a high density of microorganisms, collectively termed the colonic microbiota, which has an important role in human health and nutrition. The survival of microbiota members from the dominant Gram-negative phylum Bacteroidetes depends on their ability to degrade dietary glycans that cannot be metabolized by the host. The genes encoding proteins involved in the degradation of specific glycans are organized into co-regulated polysaccharide utilization loci, with the archetypal locus sus (for starch utilisation system) encoding seven proteins, SusA-SusG...
January 19, 2017: Nature
https://www.readbyqxmd.com/read/28076802/peldor-spectroscopy-reveals-two-defined-states-of-a-sialic-acid-trap-transporter-sbp-in-solution
#8
Janin Glaenzer, Martin F Peter, Gavin H Thomas, Gregor Hagelueken
The tripartite ATP-independent periplasmic (TRAP) transporters are a widespread class of membrane transporters in bacteria and archaea. Typical substrates for TRAP transporters are organic acids including the sialic acid N-acetylneuraminic acid. The substrate binding proteins (SBP) of TRAP transporters are the best studied component and are responsible for initial high-affinity substrate binding. To better understand the dynamics of the ligand binding process, pulsed electron-electron double resonance (PELDOR, also known as DEER) spectroscopy was applied to study the conformational changes in the N-acetylneuraminic acid-specific SBP VcSiaP...
January 10, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28069938/crystal-structure-and-mechanistic-basis-of-a-functional-homolog-of-the-antigen-transporter-tap
#9
Anne Nöll, Christoph Thomas, Valentina Herbring, Tina Zollmann, Katja Barth, Ahmad Reza Mehdipour, Thomas M Tomasiak, Stefan Brüchert, Benesh Joseph, Rupert Abele, Vincent Oliéric, Meitian Wang, Kay Diederichs, Gerhard Hummer, Robert M Stroud, Klaas M Pos, Robert Tampé
ABC transporters form one of the largest protein superfamilies in all domains of life, catalyzing the movement of diverse substrates across membranes. In this key position, ABC transporters can mediate multidrug resistance in cancer therapy and their dysfunction is linked to various diseases. Here, we describe the 2.7-Å X-ray structure of heterodimeric Thermus thermophilus multidrug resistance proteins A and B (TmrAB), which not only shares structural homology with the antigen translocation complex TAP, but is also able to restore antigen processing in human TAP-deficient cells...
January 9, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28067306/coexistence-of-topological-dirac-fermions-on-the-surface-and-three-dimensional-dirac-cone-state-in-the-bulk-of-zrte5-single-crystal
#10
Arnab Pariari, Prabhat Mandal
Although, the long-standing debate on the resistivity anomaly in ZrTe5 somewhat comes to an end, the exact topological nature of the electronic band structure remains elusive till today. Theoretical calculations predicted that bulk ZrTe5 to be either a weak or a strong three-dimensional (3D) topological insulator. However, the angle resolved photoemission spectroscopy and transport measurements clearly demonstrate 3D Dirac cone state with a small mass gap between the valence band and conduction band in the bulk...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28066915/crystallographic-analysis-of-murine-p24%C3%AE-2-golgi-dynamics-gold-domain
#11
Masamichi Nagae, Dorothee Liebschner, Yusuke Yamada, Kana Morita-Matsumoto, Naohiro Matsugaki, Toshiya Senda, Morihisa Fujita, Taroh Kinoshita, Yoshiki Yamaguchi
The p24 family proteins form homo- and hetero-oligomeric complexes for efficient transport of cargo proteins from the endoplasmic reticulum to the Golgi apparatus. It consists of four subfamilies (p24α, p24β, p24γ and p24δ). p24γ2 plays crucial roles in the selective transport of glycosylphosphatidylinositol-anchored proteins. Here we determined the crystal structure of mouse p24γ2 Golgi dynamics (GOLD) domain at 2.8 Å resolution by the single anomalous diffraction method using intrinsic sulfur atoms...
January 9, 2017: Proteins
https://www.readbyqxmd.com/read/28066542/characterization-of-tubular-liquid-crystal-structure-in-embryonic-stem-cell-derived-embryoid-bodies
#12
MengMeng Xu, Odell D Jones, Liyang Wang, Xin Zhou, Harry G Davis, Joseph L Bryant, Jianjie Ma, Willian B Isaacs, Xuehong Xu
BACKGROUND: Massive liquid crystal droplets have been found during embryonic development in more than twenty different tissues and organs, including the liver, brain and kidney. Liquid crystal deposits have also been identified in multiple human pathologies, including vascular disease, liver dysfunction, age-related macular degeneration, and other chronic illnesses. Despite the involvement of liquid crystals in such a large number of human processes, this phenomenon is poorly understood and there are no in vitro systems to further examine the function of liquid crystals in biology...
2017: Cell & Bioscience
https://www.readbyqxmd.com/read/28065269/methods-for-structural-and-functional-analyses-of-intramembrane-prenyltransferases-in-the-ubia-superfamily
#13
Y Yang, N Ke, S Liu, W Li
The UbiA superfamily is a group of intramembrane prenyltransferases that generate lipophilic compounds essential in biological membranes. These compounds, which include various quinones, hemes, chlorophylls, and vitamin E, participate in electron transport and function as antioxidants, as well as acting as structural lipids of microbial cell walls and membranes. Prenyltransferases producing these compounds are involved in important physiological processes and human diseases. These UbiA superfamily members differ significantly in their enzymatic activities and substrate selectivities...
2017: Methods in Enzymology
https://www.readbyqxmd.com/read/28059071/structural-and-mechanistic-basis-of-proton-coupled-metal-ion-transport-in-the-slc11-nramp-family
#14
Ines A Ehrnstorfer, Cristina Manatschal, Fabian M Arnold, Juerg Laederach, Raimund Dutzler
Secondary active transporters of the SLC11/NRAMP family catalyse the uptake of iron and manganese into cells. These proteins are highly conserved across all kingdoms of life and thus likely share a common transport mechanism. Here we describe the structural and functional properties of the prokaryotic SLC11 transporter EcoDMT. Its crystal structure reveals a previously unknown outward-facing state of the protein family. In proteoliposomes EcoDMT mediates proton-coupled uptake of manganese at low micromolar concentrations...
January 6, 2017: Nature Communications
https://www.readbyqxmd.com/read/28058645/efficient-organic-inorganic-hybrid-solar-cell-integrating-polymer-nanowires-and-inorganic-nanotetrapods
#15
Weizhe Xu, Furui Tan, Xiansheng Liu, Weifeng Zhang, Shengchun Qu, Zhijie Wang, Zhanguo Wang
Constructing a highly efficient bulk-heterojunction is of critical importance to the hybrid organic/inorganic solar cells. Here in this work, we introduce a novel hybrid architecture containing P3HT nanowire and CdSe nanotetrapod as bicontinuous charge channels for holes and electrons, respectively. Compared to the traditionally applied P3HT molecules, the well crystallized P3HT nanowires qualify an enhanced light absorption at the long wavelength as well as strengthened charge carrier transport in the hybrid active layer...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28058442/%C3%AF-phosphorene-a-new-allotrope-of-phosphorene
#16
Haidi Wang, Xingxing Li, Zhao Liu, Jinlong Yang
Based on the crystal structure prediction, we propose a new allotrope of phosphorene, ψ-phosphorene (ψ-P), with a porous structure, which is both thermally and dynamically stable in comparison with the previously reported allotropes. Due to its unique atom configuration, ψ-P has highly orientation-dependent mechanical properties and excellent flexibility. Calculations using the HSE functional predict that ψ-P is semiconducting with an indirect band gap of 1.57 eV and possesses anisotropic transport properties...
January 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28052201/rice-husk-silica-derived-nanomaterials-for-battery-applications-a-literature-review
#17
Yafei Shen
Silica-rich rice husk (RH) is an abundant and sustainable agricultural waste. The recovery of value added products from RH or its ash to explore an economic way for the valorization of agricultural wastes have attracted wide attention. For instance, RH can be converted to biofuels and biochars simultaneously via thermochemical processes. In general, the applications of RH biochars include soil remediation, pollutants removal, silicon battery materials, etc. This review article concludes recent progresses in the synthesis of RH-derived silicon materials for lithium-ion batteries (LIBs) applications...
January 4, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28049725/structural-basis-for-the-interaction-between-golgi-reassembly-stacking-protein-grasp55-and-golgin45
#18
Jianfeng Zhao, Bowen Li, Xiaochen Huang, Xavier Morelli, Ning Shi
Golgin45 is required for normal Golgi structure and the transportation of protein from the ER. It forms a specific complex with GRASP55 in vivo. Little is known regarding the molecular details of this interaction and its structural role in stacking of the Golgi complex. Here, we present the crystal structure of the GRASP domains of GRASP55 in complex with the Golgin45 C-terminal peptide, determined at 1.33 Angstrom resolution. Similar to the structure of GRASP65 bound to GM130 reported recently, this structure reveals more than one interacting site and involves both PDZ1 and PDZ2 GRASP domains simultaneously...
January 3, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28049306/transport-geometrical-and-topological-properties-of-stealthy-disordered-hyperuniform-two-phase-systems
#19
G Zhang, F H Stillinger, S Torquato
Disordered hyperuniform many-particle systems have attracted considerable recent attention, since they behave like crystals in the manner in which they suppress large-scale density fluctuations, and yet also resemble statistically isotropic liquids and glasses with no Bragg peaks. One important class of such systems is the classical ground states of "stealthy potentials." The degree of order of such ground states depends on a tuning parameter χ. Previous studies have shown that these ground-state point configurations can be counterintuitively disordered, infinitely degenerate, and endowed with novel physical properties (e...
December 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28045456/redox-potential-as-a-master-variable-controlling-pathways-of-metal-reduction-by-geobacter-sulfurreducens
#20
Caleb E Levar, Colleen L Hoffman, Aubrey J Dunshee, Brandy M Toner, Daniel R Bond
Geobacter sulfurreducens uses at least two different pathways to transport electrons out of the inner membrane quinone pool before reducing acceptors beyond the outer membrane. When growing on electrodes poised at oxidizing potentials, the CbcL-dependent pathway operates at or below redox potentials of -0.10 V vs the standard hydrogen electrode, whereas the ImcH-dependent pathway operates only above this value. Here, we provide evidence that G. sulfurreducens also requires different electron transfer proteins for reduction of a wide range of Fe(III)- and Mn(IV)-(oxyhydr)oxides, and must transition from a high- to low-potential pathway during reduction of commonly studied soluble and insoluble metal electron acceptors...
January 3, 2017: ISME Journal
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