keyword
MENU ▼
Read by QxMD icon Read
search

GPA

keyword
https://www.readbyqxmd.com/read/28937755/stability-and-superconductivity-of-k-p-compounds-under-pressure
#1
Yunxian Liu, Chao Wang, Xiangmu Kong, Defang Duan
We explore the phase diagram, structures, electron properties, and potential superconductivity of the K-P system at pressures of up to 200 GPa through unbiased structure searching techniques and first-principles calculations. Five stable chemical stoichiometries (K4P, K3P, K2P, KP, and KP2) have been theoretically predicted. In particular, P2 units or P-chains are uncovered in K2P, KP, and KP2 compounds with the existence of covalent bonds by analyzing the electron localization functions. And the Bader analysis demonstrates that charges transfer from K atoms to P atoms...
September 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28937741/influence-of-carbon-nanotube-characteristics-on-macroscopic-fiber-properties
#2
Dmitri E Tsentalovich, Robert James Headrick, Francesca Mirri, Junli Hao, Natnael Behabtu, Colin C Young, Matteo Pasquali
We study how intrinsic parameters of CNT samples affect the properties of macroscopic CNT fibers with optimized structure. We measure CNT diameter, number of walls, aspect ratio, graphitic character, and purity (residual catalyst and non-CNT carbon) in samples from 19 suppliers; we process the highest quality CNT samples into aligned, densely packed fibers, by using an established wet-spinning solution process. We find that fiber properties are mainly controlled by CNT aspect ratio and that sample purity is important for effective spinning...
September 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28936510/low-temperature-and-high-pressure-phases-of-a-room-temperature-ionic-liquid-and-polyiodides-1-methyl-3-propylimidazolium-iodide
#3
Hiroshi Abe, Hiroaki Kishimura, Mayumi Takaku, Mai Watanabe, Nozomu Hamaya
Using simultaneous small-angle X-ray scattering (SAXS) combined with differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS) combined with DSC measurements, low-temperature (LT) solid phases of a room-temperature ionic liquid (RTIL) and its mixtures were examined at ambient pressure. The considered RTIL was 1-methyl-3-propylimidazolium iodide ([C3mim][I]), and the mixtures could be expressed as [C3mim][Im]. Under high-pressure (HP), the crystallization of pure [C3mim][I] was suppressed, as a LT-amorphous form of pure [C3mim][I] was formed...
September 22, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28933469/investigation-of-superconductivity-in-compressed-vanadium-hydrides
#4
Quan Zhuang, Xilian Jin, Qianqian Lv, Ying Li, Ziji Shao, Zhao Liu, Xin Li, Huadi Zhang, Xing Meng, Kuo Bao, Tian Cui
Aiming at finding new superconducting materials, we performed systematical simulations on phase diagrams, crystal structures, and electronic properties of vanadium hydrides under high pressures. The VH, VH2, VH3, and VH5 species were found to be stable under high pressures; among these, VH2 had previously been investigated. Moreover, all three novel stoichiometries showed a strong ionic character as a result of the charge transfer from V to H. The electron-phonon coupling calculations revealed the potentially superconductive nature of these vanadium hydrides, with estimated superconducting critical temperature (Tc) values of 6...
September 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28931819/silicate-dissolution-boosts-the-co2-concentrations-in-subduction-fluids
#5
S Tumiati, C Tiraboschi, D A Sverjensky, T Pettke, S Recchia, P Ulmer, F Miozzi, S Poli
Estimates of dissolved CO2 in subduction-zone fluids are based on thermodynamic models, relying on a very sparse experimental data base. Here, we present experimental data at 1-3 GPa, 800 °C, and ∆FMQ ≈ -0.5 for the volatiles and solute contents of graphite-saturated fluids in the systems COH, SiO2-COH ( + quartz/coesite) and MgO-SiO2-COH ( + forsterite and enstatite). The CO2 content of fluids interacting with silicates exceeds the amounts measured in the pure COH system by up to 30 mol%, as a consequence of a decrease in water activity probably associated with the formation of organic complexes containing Si-O-C and Si-O-Mg bonds...
September 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28928371/aligning-cellulose-nanofibril-dispersions-for-tougher-fibers
#6
Pezhman Mohammadi, Matti S Toivonen, Olli Ikkala, Wolfgang Wagermaier, Markus B Linder
Nanocomposite materials made from cellulose show a great potential as future high-performance and sustainable materials. We show how high aspect ratio cellulose nanofibrils can be efficiently aligned in extrusion to fibers, leading to increased modulus of toughness (area under the stress-strain curve), Young's modulus, and yield strength by increasing the extrusion capillary length, decreasing its diameter, and increasing the flow rate. The materials showed significant property combinations, manifesting as high modulus of toughness (~28-31 MJ/m(3)) vs...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28927347/impact-of-spinal-rod-stiffness-on-porcine-lumbar-biomechanics-finite-element-model-validation-and-parametric-study
#7
Martin Brummund, Vladimir Brailovski, Yvan Petit, Yann Facchinello, Jean-Marc Mac-Thiong
A three-dimensional finite element model of the porcine lumbar spine (L1-L6) was used to assess the effect of spinal rod stiffness on lumbar biomechanics. The model was validated through a comparison with in vitro measurements performed on six porcine spine specimens. The validation metrics employed included intervertebral rotations and the nucleus pressure in the first instrumented intervertebral disc. The numerical results obtained suggest that rod stiffness values as low as 0.1 GPa are required to reduce the mobility gradient between the adjacent and instrumented segments and the nucleus pressures across the porcine lumbar spine significantly...
September 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28925695/nanomolar-inhibitors-of-glycogen-phosphorylase-based-on-%C3%AE-d-glucosaminyl-heterocycles-a-combined-synthetic-enzyme-kinetic-and-protein-crystallography-study
#8
Eva Bokor, Efthimios Kyriakis, Theodora Ga Solovou, Csenge Koppány, Anastassia L Kantsadi, Katalin E Szabó, Andrea Szakács, Georgios A Stravodimos, Tibor Docsa, Vassiliki T Skamnaki, Spyros E Zographos, Pál Gergely, Demetres D Leonidas, László Somsák
Aryl substituted 1-(β-D-glucosaminyl)-1,2,3-triazoles as well as C-β-D-glucosaminyl 1,2,4-triazoles and imidazoles were synthesized and tested as inhibitors against muscle and liver isoforms of glycogen phosphorylase (GP). While the N-β-D-glucosaminyl 1,2,3-triazoles showed weak or no inhibition, the C-β-D-glucosaminyl derivatives had potent activity and the best inhibitor was the 2-(β-D-glucosaminyl)-4(5)-(2-naphthyl)-imidazole with a Ki value of 143 nM against human liver GPa. An X-ray crystallography study of the rabbit muscle GPb inhibitor complexes revealed structural features of the strong binding, and offered an explanation for the differences in inhibitory potency between glucosyl and glucosaminyl derivatives and also for the differences between imidazole and 1,2,4-triazole analogues...
September 19, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28920915/revisiting-local-structural-changes-in-geo-sub-2-sub-glass-at-high-pressure
#9
Juncai Dong, HuRong Yao, Zhiying Guo, Quanjie Jia, Yan Wang, Pengfei An, Yu Gong, Yaxiang Liang, Dongliang Chen
Despite the great importance in fundamental and industrial fields, understanding structural changes for pressure-induced polyamorphism in network-forming glasses remains a formidable challenge. Here, we revisited the local structural transformations in GeO2 glass up to 54 GPa using x-ray absorption fine structure (XAFS) spectroscopy via a combination diamond anvil cell and polycapillary half-lens. Three polyamorphic transitions can be clearly identified by XAFS structure refinement. First, a progressive increase of the nearest Ge-O distance and bond disorder to a maximum at ~5-16 GPa, in the same pressure region of previously observed tetrahedral-octahedral transformation...
September 18, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28920686/high-pressure-synthesis-of-the-cobalt-pyrochlore-oxide-pb2co2o7-with-large-cation-mixed-occupancy
#10
Junye Yang, Jianhong Dai, Zhehong Liu, Runze Yu, Hajime Hojo, Zhiwei Hu, Tunwen Pi, Yunliang Soo, Changqing Jin, Masaki Azuma, Youwen Long
The novel A2B2O7-type compound Pb2Co2O7 was synthesized at 8 GPa and 1673 K. Synchrotron X-ray diffraction shows a cubic pyrochlore structure with space group Fd3̅m. Rietveld structural analysis reveals a large cation mixed occupancy at both A and B sites by about 40%, the greatest value found in the pyrochlore family. In combination with the X-ray absorption spectroscopy results, the specific chemical composition and charge states are determined to be (Co0.6Pb0.4)(3+)2(Pb0.6Co0.4)(4+)2O7, in which both the A-site Co(3+) and the B-site Co(4+) are low-spin...
September 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28918161/clinical-and-pathological-significance-of-cutaneous-manifestations-in-anca-associated-vasculitides
#11
REVIEW
Laure Frumholtz, Sara Laurent-Roussel, Olivier Aumaître, François Maurier, Guillaume Le Guenno, Agnes Carlotti, Alexiane Dallot, Jean Louis Kemeny, Laurent Antunes, Nicolas Froment, Sylvie Fraitag, Jonathan London, Alice Berezne, Benoît Terris, Claire Le Jeunne, Luc Mouthon, Selim Aractingi, Loïc Guillevin, Nicolas Dupin, Benjamin Terrier
OBJECTIVES: Cutaneous manifestations (CM) in ANCA-associated vasculitides (AAV) are frequent, but data on clinical significance and clinical-pathological correlations are lacking. METHODS: We conducted a multicenter, retrospective study including 1553 AAV patients. Clinical, biological and pathological features have been analyzed, and tissue samples from 46 biopsies were reviewed in a blind manner. RESULTS: CM were more frequent in EGPA (53...
September 14, 2017: Autoimmunity Reviews
https://www.readbyqxmd.com/read/28917406/comparison-of-the-mechanical-properties-of-the-anterior-lens-capsule-in-senile-cataract-senile-cataract-with-trypan-blue-application-and-pseudoexfoliation-syndrome
#12
Cem Simsek, Sibel Oto, Gursel Yilmaz, Dilek Dursun Altinors, Ahmet Akman, Sirel Gur Gungor
PURPOSE: To evaluate the elastic modulus, hardness, and mechanical properties of the anterior lens capsule in different types of cataract and to assess the correlation with age. SETTING: Baskent University Hospital, Department of Ophthalmology, Ankara, Turkey. DESIGN: Prospective comparative study. METHODS: Patients were divided into 3 groups. Group 1 comprised patients with senile cataract, Group 2 patients had pseudoexfoliation (PXF) syndrome, and Group 3 patients had dye-enhanced cataract surgery...
August 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28916795/effect-of-pressure-on-normal-and-superconducting-state-properties-of-iron-based-superconductor-prfeaso0-6f-y-y%C3%A2-%C3%A2-0-12-0-14
#13
S Arumugam, C Ganguli, R Thiyagarajan, D Bhoi, G Kalai Selvan, K Manikandan, A Pariari, P Mandal, Y Uwatoko
The effect of high pressure (up to 8 GPa) on normal and superconducting state properties of PrFeAsO0.6F0.12, an 1111-type iron based superconductor close to optimal doped region, has been investigated by measuring the temperature dependence of resistivity. Initially, the superconducting transition temperature (T c ) is observed to increase slowly by about 1 K as pressure (P) increases from 0 to 1.3 GPa. With further increase in pressure above 1.3 GPa, T c decreases at the rate of ~1.5 K/GPa. The normal-state resistivity decreases monotonically up to 8 GPa...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28915000/ductile-glass-of-polyrotaxane-toughened-by-stretch-induced-intramolecular-phase-separation
#14
Kazuaki Kato, Kaito Nemoto, Koichi Mayumi, Hideaki Yokoyama, Kohzo Ito
A new class of ductile glasses is created from a thermoplastic polyrotaxane. The hard glass, which has a Young's modulus of 1 GPa, shows crazing, necking, and strain hardening with a total elongation of 330%. Stress concentration is prevented through a unique stretch-induced intramolecular phase separation of the cyclic components and the exposed backbone. In situ synchrotron X-ray scattering studies indicate that the backbone polymer chains slip through the cyclic components in the regions where the stress is concentrated...
September 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28914375/central-nervous-system-involvement-in-patients-with-granulomatosis-with-polyangiitis-a-single-center-retrospective-study
#15
George E Fragoulis, Sophia Lionaki, Aliki Venetsanopoulou, Panayiotis G Vlachoyiannopoulos, Haralampos M Moutsopoulos, Athanasios G Tzioufas
The aims of this study were to estimate the frequency of central nervous system (CNS) involvement in Greek patients with granulomatosis with polyangiitis (GPA) and describe the related clinical characteristics and long-term outcomes of these patients. Medical charts of all ANCA-associated vasculitis patients were retrospectively reviewed, and GPA patients with CNS involvement were identified. Demographics, serological, and clinical features throughout the disease course were recorded. Comparisons of disease characteristics and long-term outcomes were performed between GPA patients with and without CNS involvement...
September 15, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28913355/evaluation-of-mechanical-properties-and-marginal-fit-of-crowns-fabricated-using-commercially-pure-titanium-and-fus-invest
#16
Jinshuang Wu, Xianli Wang, Helin Xing, Tianwen Guo, Chaofang Dong, Sefei Yang
This study investigated the mechanical properties and single crown accuracy of the tailor-made Fourth University Stomatology investment (FUS-invest) for casting titanium. Background. Current investment for casting titanium is not optimal for obtaining high-quality castings, and the commercially available titanium investment is costly. Methods. Titanium specimens were cast using the tailor-made FUS-invest. The mechanical properties were tested using a universal testing machine. Fractured castings were characterized by energy-dispersive spectroscopy...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28912820/granulomatosis-with-polyangiitis-with-myocarditis-and-ventricular-tachycardia
#17
Ramy Magdy Hanna, Eduardo Lopez, James Wilson
Granulomatosis with polyangiitis (GPA), previously known as Wegener's granulomatosis, is a pulmonary-renal syndrome affecting small and medium sized blood vessels. The disease has a prevalence in studies ranging from 3 to 15.7 cases per 100,000, with a noted increasing incidence and prevalence in more recent studies. Pulmonary manifestations include hemorrhage, lung cavitary lesions, and pulmonary fibrosis. Within the kidney, GPA is known to cause rapidly progressive pauci-immune crescentic glomerulonephritis...
2017: Case Reports in Medicine
https://www.readbyqxmd.com/read/28910522/giant-pressure-induced-enhancement-of-seebeck-coefficient-and-thermoelectric-efficiency-in-snte
#18
Jason Baker, Ravhi S Kumar, Changyong Park, Curtis Benson, Andrew Cornelius, Nenad Velisavljevic
The thermoelectric properties of polycrystalline SnTe have been measured up to 4.5 GPa at 330 K. SnTe shows an enormous enhancement in Seebeck coefficient greater than 200% after 3 GPa, which correlates to a known pressure-induced structural phase transition that is observed through simultaneous in-situ X-ray diffraction measurement. Electrical resistance and relative changes to the thermal conductivity were also measured providing determination of relative changes in the dimensionless figure of merit (ZT), which increases dramatically after 3 GPa reaching 350% of the lowest pressure ZT value...
September 14, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28910128/future-so-bright-delay-discounting-and-consideration-of-future-consequences-predict-academic-performance-among-college-drinkers
#19
Samuel F Acuff, Kathryn E Soltis, Ashley A Dennhardt, Brian Borsari, Matthew P Martens, James G Murphy
College student drinking is a major public health concern and can result in a range of negative consequences, from acute health risks to decreased academic performance and drop out. Harm reduction interventions have been developed to reduce problems associated with drinking but there is a need to identify specific risk/protective factors related to academic performance among college drinkers. Behavioral economics suggests that chronic alcohol misuse reflects a dysregulated behavioral process or reinforcer pathology-alcohol is overvalued and the value of prosocial rewards are sharply discounted due, in part, to their delay...
September 14, 2017: Experimental and Clinical Psychopharmacology
https://www.readbyqxmd.com/read/28905856/position-paper-revised-2017-international-consensus-on-testing-of-ancas-in-granulomatosis-with-polyangiitis-and-microscopic-polyangiitis
#20
REVIEW
Xavier Bossuyt, Jan-Willem Cohen Tervaert, Yoshihiro Arimura, Daniel Blockmans, Luis Felipe Flores-Suárez, Loïc Guillevin, Bernhard Hellmich, David Jayne, J Charles Jennette, Cees G M Kallenberg, Sergey Moiseev, Pavel Novikov, Antonella Radice, Judith Anne Savige, Renato Alberto Sinico, Ulrich Specks, Pieter van Paassen, Ming-Hui Zhao, Niels Rasmussen, Jan Damoiseaux, Elena Csernok
Anti-neutrophil cytoplasmic antibodies (ANCAs) are valuable laboratory markers used for the diagnosis of well-defined types of small-vessel vasculitis, including granulomatosis with polyangiitis (GPA) and microscopic polyangiitis (MPA). According to the 1999 international consensus on ANCA testing, indirect immunofluorescence (IIF) should be used to screen for ANCAs, and samples containing ANCAs should then be tested by immunoassays for proteinase 3 (PR3)-ANCAs and myeloperoxidase (MPO)-ANCAs. The distinction between PR3-ANCAs and MPO-ANCAs has important clinical and pathogenic implications...
September 14, 2017: Nature Reviews. Rheumatology
keyword
keyword
40173
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"