keyword
MENU ▼
Read by QxMD icon Read
search

Bi polar

keyword
https://www.readbyqxmd.com/read/28094258/interfacial-superconductivity-in-a-bi-collinear-antiferromagnetically-ordered-fete-monolayer-on-a-topological-insulator
#1
S Manna, A Kamlapure, L Cornils, T Hänke, E M J Hedegaard, M Bremholm, B B Iversen, Ph Hofmann, J Wiebe, R Wiesendanger
The discovery of high-temperature superconductivity in Fe-based compounds triggered numerous investigations on the interplay between superconductivity and magnetism, and on the enhancement of transition temperatures through interface effects. It is widely believed that the emergence of optimal superconductivity is intimately linked to the suppression of long-range antiferromagnetic (AFM) order, although the exact microscopic picture remains elusive because of the lack of atomically resolved data. Here we present spin-polarized scanning tunnelling spectroscopy of ultrathin FeTe1-xSex (x=0, 0...
January 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28090722/bi-io3-f2-the-first-metal-iodate-fluoride-with-a-very-strong-second-harmonic-generation-effect
#2
Fei-Fei Mao, Chun-Li Hu, Xiang Xu, Dong Yan, Bing-Ping Yang, Jiang-Gao Mao
The first metal iodate fluoride, Bi(IO3 )F2 , with a strong second harmonic generation (SHG) effect has been prepared. Bi(IO3 )F2 crystallizes in the polar space group C2 and features a three-dimensional [BiF2 ](+) cationic framework with IO3 groups capping the inner walls of the one-dimensional tunnels. This [BiF2 ](+) cationic framework acts as a template for the assembly of the polar IO3 units in a favorable superposed fashion, which leads to the polar structure of the material. Bi(IO3 )F2 displays a rather wide transmittance window (0...
January 16, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28074835/topological-dirac-nodal-lines-and-surface-charges-in-fcc-alkaline-earth-metals
#3
Motoaki Hirayama, Ryo Okugawa, Takashi Miyake, Shuichi Murakami
In nodal-line semimetals, the gaps close along loops in k space, which are not at high-symmetry points. Typical mechanisms for the emergence of nodal lines involve mirror symmetry and the π Berry phase. Here we show via ab initio calculations that fcc calcium (Ca), strontium (Sr) and ytterbium (Yb) have topological nodal lines with the π Berry phase near the Fermi level, when spin-orbit interaction is neglected. In particular, Ca becomes a nodal-line semimetal at high pressure. Owing to nodal lines, the Zak phase becomes either π or 0, depending on the wavevector k, and the π Zak phase leads to surface polarization charge...
January 11, 2017: Nature Communications
https://www.readbyqxmd.com/read/28073064/a-comparative-study-on-electromagnetic-interference-shielding-behaviors-of-chemically-reduced-and-thermally-reduced-graphene-aerogels
#4
Shuguang Bi, Liying Zhang, Chenzhong Mu, Heng Yeong Lee, Jun Wei Cheah, Eng Kee Chua, Kye Yak See, Ming Liu, Xiao Hu
Electromagnetic interference (EMI) shielding performance of chemically and thermally reduced graphene aerogels (GAs) was systematically studied. The EMI shielding mechanisms were extensively analyzed in terms of the distinct surface characteristics resulted from the different reduction methods for the first time. EMI shielding effectiveness (SE) of chemically and thermally reduced GAs reached 27.6 (GAC) and 40.2dB (GAT) at the thickness of 2.5mm, respectively. It was found that the introduction of nitrogen atoms through chemical reduction induced localized charges on the carbon backbone leading to strong polarization effects of GAC...
December 28, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28068475/fabrication-of-stretchable-nanocomposites-with-high-energy-density-and-low-loss-from-cross-linked-pvdf-filled-with-poly-dopamine-encapsulated-batio3
#5
Yunchuan Xie, Yangyang Yu, Yefeng Feng, Wanrong Jiang, Zhicheng Zhang
In this report, a simple solution-cast method was employed to prepare poly(dopamine) (PDA) encapsulated BaTiO3 (BT) nanoparticle (PDA@BT) filled composites using PVDF matrix cross-linked by the free radical initiator. The effects of both the particle encapsulation and matrix cross-linking on the mechanical and dielectric properties of the composites were carefully investigated. The results suggested that the introduction of BT particles improved permittivity of the composites to ∼30 at 100 Hz when particle contents of only 7 wt % were utilized...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28067505/iodide-iodates-m3-io3-12%C3%A2-ag4i-m-bi-tb-with-a-framework-structure-and-high-second-harmonic-generation-optical-response
#6
Elena L Belokoneva, Sergey Yu Stefanovich, Olga V Dimitrova, Alina S Karamysheva, Anatoly S Volkov
Single crystals of two new iodide-iodates, Bi3[IO3]12·Ag4I and Tb3[IO3]12·Ag4I, are synthesized in hydrothermal systems. The anionic parts in both iodide-iodates are characterized as a complex charged framework of isolated IO3 umbrella-like groups and large Bi(Tb)-O polyhedra similar to those previously found in La3[IO3]12[IO3](Pb3O). Broad channels along the c-axis contain compensators: (Ag3I)(2+) umbrella-like groups and additional Ag(+) ions which form Ag4(4+) tetrahedral clusters augmented with I(-) halogen...
January 9, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28062994/some-remarks-on-the-distribution-and-dispersion-of-coccidia-from-icterid-birds-in-south-america-isospora-guaxi-n-sp-and-isospora-bellicosa-upton-stamper-whitaker-1995-apicomplexa-eimeriidae-from-the-red-rumped-cacique-cacicus-haemorrhous-l-passeriformes-icteridae
#7
Lidiane Maria da Silva, Mariana Borges Rodrigues, Irlane Faria de Pinho, Bruno do Bomfim Lopes, Hermes Ribeiro Luz, Ildemar Ferreira, Carlos Wilson Gomes Lopes, Bruno Pereira Berto
A new species of coccidian, Isospora guaxi n. sp., and Isospora bellicosa Upton, Stamper & Whitaker, 1995 (Protozoa: Apicomplexa: Eimeriidae) are recorded from red-rumped caciques Cacicus haemorrhous (L.) in the Parque Nacional do Itatiaia, Brazil. Isospora guaxi n. sp. has sub-spheroidal oöcysts, measuring on average 30.9 × 29.0 μm, with smooth, bi-layered wall c.1.9 μm thick. Micropyle and oöcyst residuum are absent, but a polar granule is present. Sporocysts are ellipsoidal, measuring on average 19...
January 2017: Systematic Parasitology
https://www.readbyqxmd.com/read/28052552/celsr2-encoding-a-planar-cell-polarity-protein-is-a-putative-gene-in-joubert-syndrome-with-cortical-heterotopia-microophthalmia-and-growth-hormone-deficiency
#8
Thierry Vilboux, May Christine V Malicdan, Joseph C Roney, Andrew R Cullinane, Joshi Stephen, Deniz Yildirimli, Joy Bryant, Roxanne Fischer, Meghana Vemulapalli, James C Mullikin, Peter J Steinbach, William A Gahl, Meral Gunay-Aygun
Joubert syndrome is a ciliopathy characterized by a specific constellation of central nervous system malformations that result in the pathognomonic "molar tooth sign" on imaging. More than 27 genes are associated with Joubert syndrome, but some patients do not have mutations in any of these genes. Celsr1, Celsr2, and Celsr3 are the mammalian orthologues of the drosophila planar cell polarity protein, flamingo; they play important roles in neural development, including axon guidance, neuronal migration, and cilium polarity...
January 4, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/28046496/tu-h-bra-09-relationship-between-b0-and-the-contrast-to-noise-ratio-cnr-of-tumour-to-background-for-mri-radiotherapy-hybrids
#9
K Wachowicz, N DeZanche, E Yip, V Volotovskyy, B Fallone
PURPOSE: To investigate the relationship in MRI between B0 and the contrast-to-noise ratio (CNR) of various tumour/normal tissue pairs. This study is motivated by the current interest in MRI/radiotherapy hybrids, for which multiple magnetic field strengths have been proposed. CNR is the single most important parameter governing the ability of a system to identify a tumour in real time for treatment guidance. The MRI community has long since recognized that the SNR of a well-designed MR system is roughly proportional to B0 , the polarizing magnetic field...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28032753/thermodynamic-stability-of-bifeo3-0001-surfaces-from-ab-initio-theory
#10
Jian-Qing Dai, Jie-Wang Xu, Jian-Hui Zhu
The relative stability of multiferroic BiFeO3 (0001) surfaces, which is the (111) facet in the pseudocubic notation, with different stoichiometry is systematically studied by using ab-initio thermodynamic approach in order to obtain insights into the stable surface terminations. We predict that, under most chemical potential conditions, the thermodynamically favored terminations for the negative and positive surfaces are -Bi-O2 and -Fe-O3-Bi, respectively. The predicted difference in oxygen content between the negative and positive surfaces is consistent with experimental observations at the BiFeO3/metal interfaces [Nat...
December 29, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28008852/modularity-and-determinants-of-a-bi-polarization-control-system-from-free-living-and-obligate-intracellular-bacteria
#11
Matthieu Bergé, Sébastien Campagne, Johann Mignolet, Seamus Holden, Laurence Théraulaz, Suliana Manley, Frédéric H-T Allain, Patrick H Viollier
Although free-living and obligate intracellular bacteria are both polarized it is unclear whether the underlying polarization mechanisms and effector proteins are conserved. Here we dissect at the cytological, functional and structural level a conserved polarization module from the free living α-proteobacterium Caulobacter crescentus and an orthologous system from an obligate intracellular (rickettsial) pathogen. The NMR solution structure of the zinc-finger (ZnR) domain from the bifunctional and bipolar ZitP pilus assembly/motility regulator revealed conserved interaction determinants for PopZ, a bipolar matrix protein that anchors the ParB centromere-binding protein and other regulatory factors at the poles...
December 23, 2016: ELife
https://www.readbyqxmd.com/read/28008851/functional-dichotomy-and-distinct-nanoscale-assemblies-of-a-cell-cycle-controlled-bipolar-zinc-finger-regulator
#12
Johann Mignolet, Seamus Holden, Matthieu Bergé, Gaël Panis, Ezgi Eroglu, Laurence Théraulaz, Suliana Manley, Patrick H Viollier
Protein polarization underlies differentiation in metazoans and in bacteria. How symmetric polarization can instate functional asymmetry remains elusive. Here, we show by super-resolution photo-activated localization microscopy and edgetic mutations that the bitopic zinc-finger protein ZitP implements specialized developmental functions - pilus biogenesis and multifactorial swarming motility - while shaping distinct nanoscale (bi)polar architectures in the asymmetric model bacterium Caulobacter crescentus. Polar assemblage and accumulation of ZitP and its effector protein CpaM are orchestrated in time and space by conserved components of the cell cycle circuitry that coordinate polar morphogenesis with cell cycle progression, and also act on the master cell cycle regulator CtrA...
December 23, 2016: ELife
https://www.readbyqxmd.com/read/27982494/polar-hinges-as-functionalized-conformational-constraints-in-bi-cyclic-peptides
#13
Rob M J Liskamp, Valerijs Korotkovs, Joachim Bijl, Claire Wilson, Helmus van de Langemheen, Sangram Kale, Christian Heinis
Two polar hinges have been developed for cyclization of peptides leading to bicyclic peptides and cyclized peptides with improved solubility and biological activity. Increasingly, we note that a good aqueous solubility of peptides is an absolute prerequisite not only to be able to handle and purify our target peptides but also crucial for biological activity characteristics. Compared to earlier hinges, the structurally similar but chemically very different TATB and TBMT each containing three nitrogen atoms were accessible in one step from bromo-acetonitrile...
December 16, 2016: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/27958313/designing-perfect-linear-polarization-converters-using-perfect-electric-and-magnetic-conducting-surfaces
#14
Gaochao Zhou, Xudong Tao, Ze Shen, Guanghao Zhu, Biaobing Jin, Lin Kang, Weiwei Xu, Jian Chen, Peiheng Wu
We propose a kind of general framework for the design of a perfect linear polarization converter that works in the transmission mode. Using an intuitive picture that is based on the method of bi-directional polarization mode decomposition, it is shown that when the device under consideration simultaneously possesses two complementary symmetry planes, with one being equivalent to a perfect electric conducting surface and the other being equivalent to a perfect magnetic conducting surface, linear polarization conversion can occur with an efficiency of 100% in the absence of absorptive losses...
December 13, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27957857/n-type-self-doping-of-fluorinate-conjugated-polyelectrolytes-for-polymer-solar-cells-modulation-of-dipole-morphology-and-conductivity
#15
Huimin Liu, Liqiang Huang, Xiaofang Cheng, Aifeng Hu, Haitao Xu, Lie Chen, Yiwang Chen
For the conjugated polyelectrolytes (CPEs) interlayers, many studies focus on the modulation of interfacial dipoles in the polymer solar cells (PSCs) by altering the side polar groups but usually ignore the functions of conjugated backbone engineering (CBE) through the delicate design to improve their functions. Herein, novel alcohol-soluble CPEs by incorporation of fluorinate benzene onto the backbone, namely PFf1B and PFf4B, have been synthesized to modulate the interfacial dipoles and charge mobility. A favorable bidipole composed of ion-induced dipole and F hydrogen bond-induced dipole was discovered to be responsible for the tunable work function of indium tin oxide (ITO) electrode...
December 22, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27951486/in%C3%A2-vitro-activity-and-mode-of-action-of-distamycin-analogues-against-african-trypanosomes
#16
Jaime Franco, Andrea Medeiros, Diego Benítez, Karen Perelmuter, Gloria Serra, Marcelo A Comini, Laura Scarone
Distamycin, a natural polyamide containing three heterocycle rings with a polar end, has inspired several groups to prepare synthetic analogues, which proved to have anti-trypanosomal and anti-tumoral activity. We describe the synthesis of bi and tri thiazoles amides that harbor different substitutions at their ends and the evaluation of their anti-Trypanosoma brucei activity. The most active compound 10b showed better biological activity (EC50 310 nM and selectivity index 16) than the control drug nifurtimox (EC50 15 μM and selectivity index 10)...
December 2, 2016: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/27911134/split-face-histological-and-biochemical-evaluation-of-tightening-efficacy-using-temperature-and-impedance-controlled-continuous-non-invasive-radiofrequency-energy
#17
Sylvie Boisnic, Marc Divaris, Marie-Christine Branchet, Andrew Anthony Nelson
BACKGROUND: Bi-polar radiofrequency (RF) is capable of heating dermal collagen fibers and inducing skin tightening by collagen remodelling. OBJECTIVE: To substantiate safety and improvement of skin laxity following skin heating with a novel temperature and impedance controlled non-invasive radiofrequency (RF) device by histological and biochemical evaluations. METHODS: A split-face study was performed on 4 subjects that underwent 8 weekly RF sessions on one side of their face, leaving the other side an untreated control and then underwent face-lift procedure...
December 2, 2016: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/27871801/lipid-profiling-of-polarized-human-monocyte-derived-macrophages
#18
J Rafael Montenegro-Burke, Jessica A Sutton, Lisa M Rogers, Ginger L Milne, John A McLean, David M Aronoff
The highly orchestrated transcriptional and metabolic reprogramming during activation drastically transforms the main functions and physiology of human macrophages across the polarization spectrum. Lipids, for example, can modify protein function by acting remotely as signaling molecules but also locally by altering the physical properties of cellular membranes. These changes play key roles in the functions of highly plastic immune cells due to their involvement in inflammation, immune responses, phagocytosis and wound healing processes...
December 2016: Prostaglandins & Other Lipid Mediators
https://www.readbyqxmd.com/read/27846563/observation-of-a-nematic-quantum-hall-liquid-on-the-surface-of-bismuth
#19
Benjamin E Feldman, Mallika T Randeria, András Gyenis, Fengcheng Wu, Huiwen Ji, R J Cava, Allan H MacDonald, Ali Yazdani
Nematic quantum fluids with wave functions that break the underlying crystalline symmetry can form in interacting electronic systems. We examined the quantum Hall states that arise in high magnetic fields from anisotropic hole pockets on the Bi(111) surface. Spectroscopy performed with a scanning tunneling microscope showed that a combination of single-particle effects and many-body Coulomb interactions lift the six-fold Landau level (LL) degeneracy to form three valley-polarized quantum Hall states. We imaged the resulting anisotropic LL wave functions and found that they have a different orientation for each broken-symmetry state...
October 21, 2016: Science
https://www.readbyqxmd.com/read/27837282/the-chromosomal-basis-of-meiotic-acentrosomal-spindle-assembly-and-function-in-oocytes
#20
REVIEW
Sarah J Radford, Alexandra L Nguyen, Karen Schindler, Kim S McKim
Several aspects of meiosis are impacted by the absence of centrosomes in oocytes. Here, we review four aspects of meiosis I that are significantly affected by the absence of centrosomes in oocyte spindles. One, microtubules tend to assemble around the chromosomes. Two, the organization of these microtubules into a bipolar spindle is directed by the chromosomes. Three, chromosome bi-orientation and attachment to microtubules from the correct pole require modification of the mechanisms used in mitotic cells. Four, chromosome movement to the poles at anaphase cannot rely on polar anchoring of spindle microtubules by centrosomes...
November 11, 2016: Chromosoma
keyword
keyword
38480
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"