keyword
MENU ▼
Read by QxMD icon Read
search

insulator

keyword
https://www.readbyqxmd.com/read/28350969/mechanisms-of-spontaneous-pacing-sa-nodal-cells-neonatal-cardiomyocytes-and-human-stem-cell-derived-cardiomyocytes
#1
Martin Morad, Xiaohua Zhang
The sino-atrial node is the primary site from which the mammalian heart is paced, but the mechanisms underlying the pacemaking still remain clouded. It is generally believed that the hyperpolarization-activated current I<sub><i>f</i></sub>, encoded by Hyperpolarization-activated cyclic nucleotide-gated (HCN) genes, contributes significantly to pacing, which in tandem with inward current generated by efflux of Ca<sup>2+</sup> via the Na<sup>+</sup>-Ca<sup>2+</sup> exchanger (NCX), resulting from the released Ca<sup>2+</sup>, mediates the diastolic depolarization...
March 28, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28350962/multi-dimensional-hybridization-of-dark-surface-plasmons
#2
Andrew B Yankovich, Ruggero Verre, Erik Olsén, Anton E O Persson, Viet Trinh, Gudrun Dovner, Mikael Käll, Eva Olsson
Synthetic three-dimensional nano-architectures are providing more control over light-matter interactions and rapidly progressing photonic based technology. These applications often utilize the strong synergy between electromagnetic fields and surface plasmons (SPs) in metallic nanostructures. However, many of the SP interactions hosted by complex 3D nanostructures are poorly understood because they involve dark hybridized states that are typically undetectable with far-field optical spectroscopy. Here, we use experimental and theoretical electron energy loss spectroscopy (EELS) to elucidate dark SPs and their interactions in layered metal-insulator-metal disc nanostructures...
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28350542/intermediate-stages-of-surface-state-formation-and-collapse-of-topological-protection-to-transport-in-bi2se3
#3
Abhishek Banerjee, Abhishek Rai, Kunjalata Majhi, Sudipta Roy Barman, R Ganesan, P S Anil Kumar
Surface states consisting of helical Dirac fermions have been extensively studied in three-dimensional topological insulators. Yet, experiments to date have only investigated fully formed topological surface states (TSS) and it is not known whether preformed or partially formed surface states can exist or what properties they could potentially host. Here, by decorating thin films of Bi2Se3 with nanosized islands of the same material, we show for the first time that not only can surface states exist in various intermediate stages of formation but they exhibit unique properties not accessible in fully formed TSS...
March 28, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28345884/canted-antiferromagnetism-on-rectangular-layers-of-fe-2-in-polymorphic-cafeseo
#4
Kwing To Lai, Alexander Christoph Komarek, Maria Teresa Fernández-Díaz, Pi-Shan Chang, Sungjoon Huh, Helge Rosner, Chang-Yang Kuo, Zhiwei Hu, Tun-Wen Pi, Peter Adler, Vadim Ksenofontov, Liu Hao Tjeng, Martin Valldor
From stoichiometric amounts of CaO, Fe, and Se, pure powders and single crystals of quaternary [Formula: see text] can be obtained by solid-state reaction and self-flux growth, respectively. The as-synthesized compound exhibits a polymorphic crystal structure, where the two modifications have different stacking sequences of [Formula: see text] layers. The two polymorphs have similar unit cells but different crystal symmetries (Cmc21 and Pnma), of which the former is non-centrosymmetric. Fe is divalent (d(6)) and high-spin, as proven by X-ray spectroscopy, Mössbauer spectroscopy, and powder neutron diffraction data...
March 27, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28345708/evaluation-of-two-and-three-dimensional-electrode-platforms-for-the-electrochemical-characterization-of-organometallic-catalysts-incorporated-in-non-conducting-metal-organic-frameworks
#5
Edgar Mijangos, Souvik Roy, Sonja Pullen, Reiner Lomoth, Sascha Ott
The development of a reliable platform for the electrochemical characterization of a redox-active molecular diiron complex, [FeFe], immobilized in a non-conducting metal organic framework (MOF), UiO-66, based on glassy-carbon electrodes is reported. Voltammetric data with appreciable current responses can be obtained by the use of multiwalled carbon nanotubes (MWCNT) or mesoporous carbon (CB) additives that function as conductive scaffolds to interface the MOF crystals in "three-dimensional" electrodes. In the investigated UiO-66-[FeFe] sample, the low abundance of [FeFe] in the MOF and the intrinsic insulating properties of UiO-66 prevent charge transport through the framework, and consequently, only [FeFe] units that are in direct physical contact with the electrode material are electrochemically addressable...
March 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28345418/a-coaxial-dual-element-focused-ultrasound-probe-for-guidance-of-epidural-catheterization
#6
Guo-Chung Dong, Li-Chen Chiu, Chien-Kun Ting, Jia-Ruei Hsu, Chih-Chung Huang, Yin Chang, Gin-Shin Chen
Ultrasound guidance for epidural block has improved clinical blind-trial problems but the design of present ultrasonic probes poses operating difficulty of ultrasound-guided catheterization, increasing the failure rate. The purpose of this study was to develop a novel ultrasonic probe to avoid needle contact with vertebral bone during epidural catheterization. The probe has a central circular passage for needle insertion. Two focused annular transducers are deployed around the passage for on-axis guidance. A 17-gauge insulated Tuohy needle containing the self-developed fiber-optic-modified stylet was inserted into the back of the anesthetized pig, in the lumbar region under the guidance of our ultrasonic probe...
March 1, 2017: Ultrasonic Imaging
https://www.readbyqxmd.com/read/28345313/acute-hyperglycemia-associated-with-anti-cancer-medication
#7
REVIEW
Yul Hwangbo, Eun Kyung Lee
Hyperglycemia during chemotherapy occurs in approximately 10% to 30% of patients. Glucocorticoids and L-asparaginase are well known to cause acute hyperglycemia during chemotherapy. Long-term hyperglycemia is also frequently observed, especially in patients with hematologic malignancies treated with L-asparaginase-based regimens and total body irradiation. Glucocorticoid-induced hyperglycemia often develops because of increased insulin resistance, diminished insulin secretion, and exaggerated hepatic glucose output...
March 2017: Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28345050/observation-of-inverse-edelstein-effect-in-rashba-split-2deg-between-srtio3-and-laalo3-at-room-temperature
#8
Qi Song, Hongrui Zhang, Tang Su, Wei Yuan, Yangyang Chen, Wenyu Xing, Jing Shi, Jirong Sun, Wei Han
The Rashba physics has been intensively studied in the field of spin orbitronics for the purpose of searching novel physical properties and the ferromagnetic (FM) magnetization switching for technological applications. We report our observation of the inverse Edelstein effect up to room temperature in the Rashba-split two-dimensional electron gas (2DEG) between two insulating oxides, SrTiO3 and LaAlO3, with the LaAlO3 layer thickness from 3 to 40 unit cells (UC). We further demonstrate that the spin voltage could be markedly manipulated by electric field effect for the 2DEG between SrTiO3 and 3-UC LaAlO3...
March 2017: Science Advances
https://www.readbyqxmd.com/read/28345012/enhanced-telecom-emission-from-single-group-iv-quantum-dots-by-precise-cmos-compatible-positioning-in-photonic-crystal-cavities
#9
Magdalena Schatzl, Florian Hackl, Martin Glaser, Patrick Rauter, Moritz Brehm, Lukas Spindlberger, Angelica Simbula, Matteo Galli, Thomas Fromherz, Friedrich Schäffler
Efficient coupling to integrated high-quality-factor cavities is crucial for the employment of germanium quantum dot (QD) emitters in future monolithic silicon-based optoelectronic platforms. We report on strongly enhanced emission from single Ge QDs into L3 photonic crystal resonator (PCR) modes based on precise positioning of these dots at the maximum of the respective mode field energy density. Perfect site control of Ge QDs grown on prepatterned silicon-on-insulator substrates was exploited to fabricate in one processing run almost 300 PCRs containing single QDs in systematically varying positions within the cavities...
March 15, 2017: ACS Photonics
https://www.readbyqxmd.com/read/28344987/safe-and-effective-gene-therapy-for-murine-wiskott-aldrich-syndrome-using-an-insulated-lentiviral-vector
#10
Swati Singh, Iram Khan, Socheath Khim, Brenda Seymour, Karen Sommer, Matthew Wielgosz, Zachary Norgaard, Hans-Peter Kiem, Jennifer Adair, Denny Liggitt, Arthur Nienhuis, David J Rawlings
Wiskott-Aldrich syndrome (WAS) is a life-threatening immunodeficiency caused by mutations within the WAS gene. Viral gene therapy to restore WAS protein (WASp) expression in hematopoietic cells of patients with WAS has the potential to improve outcomes relative to the current standard of care, allogeneic bone marrow transplantation. However, the development of viral vectors that are both safe and effective has been problematic. While use of viral transcriptional promoters may increase the risk of insertional mutagenesis, cellular promoters may not achieve WASp expression levels necessary for optimal therapeutic effect...
March 17, 2017: Molecular Therapy. Methods & Clinical Development
https://www.readbyqxmd.com/read/28343111/the-intimate-relationship-as-a-site-of-social-protection-partnerships-between-people-who-inject-drugs
#11
Tim Rhodes, Jake Rance, Suzanne Fraser, Carla Treloar
Public health research treats intimate partnerships as sites of risk management, including in the management of HIV and hepatitis C transmission. This risk-infused biomedical approach tends to undermine appreciation of the emotional and socially situated meanings of care in intimate partnerships. In this article we explore qualitative interview accounts of the care enacted in partnerships between people who inject drugs, drawing on a 2014 study of 34 couples and 12 individuals living in two locations of Australia...
March 10, 2017: Social Science & Medicine
https://www.readbyqxmd.com/read/28340434/potentially-direct-interspecies-electron-transfer-of-methanogenesis-for-syntrophic-metabolism-under-sulfate-reducing-conditions-with-stainless-steel
#12
Yue Li, Yaobin Zhang, Yafei Yang, Xie Quan, Zhiqiang Zhao
Direct interspecies electron transfer (DIET) is an alternative to syntrophic metabolism in natural carbon cycle as well as in anaerobic digesters, but its function in anaerobic treatment of sulfate-containing wastewater have not yet to be described. Here, conductive stainless steel was added into anaerobic digesters for treating sulfate-containing wastewater to investigate the potential role of DIET in the response to the sulfate impact. Results showed that adding the conductive stainless steel made the anaerobic digestion less affected by the sulfate reduction than adding insulative plastic material...
March 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28340177/the-significance-of-internode-length-for-saltatory-conduction-looking-back-at-the-age-of-90
#13
Reinhard L Friede
The development of peripheral nerve fibers involves interdependence between the timing of Schwann cell recruitment during myelination and elongation of the nerve. This adjusts the number and the length of internodes to the length of the fiber. Saltatory conduction in longer nerves involves longer saltations; this makes internode length the factor that determines conduction velocity, thereby adjusting impulse transmission in circuits of different lengths. Myelination increases conduction velocity by means of saltatory conduction but what determines the saltatory conduction is not so much the indispensable insulating adjunct of myelin as the length of the internodes that separate the excitable membrane segments...
March 14, 2017: Journal of Neuropathology and Experimental Neurology
https://www.readbyqxmd.com/read/28339638/the-impact-of-older-parents-pain-symptoms-on-adult-children
#14
Karl Pillemer, Catherine Riffin, J Jill Suitor, Siyun Peng, M C Reid
Objective. : Not only is persistent pain a debilitating health problem for older adults, it also may have negative effects on family relationships. Studies have documented the effects of pain on spouses and on parents of young children. However, research has not extended this line of inquiry to later life, and specifically to the impact of older parents' pain symptoms on adult children. This study addresses the question: Does older mothers' pain affect the quality of relations with offspring? Subjects and Design...
February 16, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/28339249/electric-control-of-dirac-quasiparticles-by-spin-orbit-torque-in-an-antiferromagnet
#15
L Šmejkal, J Železný, J Sinova, T Jungwirth
Spin orbitronics and Dirac quasiparticles are two fields of condensed matter physics initiated independently about a decade ago. Here we predict that Dirac quasiparticles can be controlled by the spin-orbit torque reorientation of the Néel vector in an antiferromagnet. Using CuMnAs as an example, we formulate symmetry criteria allowing for the coexistence of topological Dirac quasiparticles and Néel spin-orbit torques. We identify the nonsymmorphic crystal symmetry protection of Dirac band crossings whose on and off switching is mediated by the Néel vector reorientation...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28339248/anderson-transition-of-cold-atoms-with-synthetic-spin-orbit-coupling-in-two-dimensional-speckle-potentials
#16
Giuliano Orso
We investigate the metal-insulator transition occurring in two-dimensional (2D) systems of noninteracting atoms in the presence of artificial spin-orbit interactions and a spatially correlated disorder generated by laser speckles. Based on a high order discretization scheme, we calculate the precise position of the mobility edge and verify that the transition belongs to the symplectic universality class. We show that the mobility edge depends strongly on the mixing angle between Rashba and Dresselhaus spin-orbit couplings...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28339237/current-noise-from-a-magnetic-moment-in-a-helical-edge
#17
Jukka I Väyrynen, Leonid I Glazman
We calculate the two-terminal current noise generated by a magnetic moment coupled to a helical edge of a two-dimensional topological insulator. When the system is symmetric with respect to in-plane spin rotation, the noise is dominated by the Nyquist component even in the presence of a voltage bias V. The corresponding noise spectrum S(V,ω) is determined by a modified fluctuation-dissipation theorem with the differential conductance G(V,ω) in place of the linear one. The differential noise ∂S/∂V, commonly measured in experiments, is strongly dependent on frequency on a small scale τ_{K}^{-1}≪T set by the Korringa relaxation rate of the local moment...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28339229/first-principles-based-method-for-electron-localization-application-to-monolayer-hexagonal-boron-nitride
#18
C E Ekuma, V Dobrosavljević, D Gunlycke
We present a first-principles-based many-body typical medium dynamical cluster approximation and density function theory method for characterizing electron localization in disordered structures. This method applied to monolayer hexagonal boron nitride shows that the presence of boron vacancies could turn this wide-gap insulator into a correlated metal. Depending on the strength of the electron interactions, these calculations suggest that conduction could be obtained at a boron vacancy concentration as low as 1...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28338048/reconfigurable-superconducting-vortex-pinning-potential-for-magnetic-disks-in-hybrid-structures
#19
Estefani Marchiori, Peter J Curran, Jangyong Kim, Nathan Satchell, Gavin Burnell, Simon J Bending
High resolution scanning Hall probe microscopy has been used to directly visualise the superconducting vortex behavior in hybrid structures consisting of a square array of micrometer-sized Py ferromagnetic disks covered by a superconducting Nb thin film. At remanence the disks exist in almost fully flux-closed magnetic vortex states, but the observed cloverleaf-like stray fields indicate the presence of weak in-plane anisotropy. Micromagnetic simulations suggest that the most likely origin is an unintentional shape anisotropy...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28337992/quantum-capacitance-of-a-topological-insulator-ferromagnet-interface
#20
Zhuo Bin Siu, Debashree Chowdhury, Mansoor B A Jalil, Banasri Basu
We study the quantum capacitance in a topological insulator thin film system magnetized in the in-plane direction in the presence of an out-of-plane magnetic field and hexagonal warping. To first order, the modification in quantum capacitance due to hexagonal warping compared to the clean case, where both the in-plane magnetization and hexagonal warping are absent, is always negative, and increases in magnitude monotonically with the energy difference from the charge neutrality point. In contrast, the change in the quantum capacitance due to in-plane magnetization oscillates with the energy in general, except when a certain relation between the inter-surface coupling, out of plane Zeeman energy splitting and magnetic field strength is satisfied...
March 24, 2017: Scientific Reports
keyword
keyword
95236
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"