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https://www.readbyqxmd.com/read/28635620/anomalous-dielectric-response-of-short-hydrogen-bonds-under-pressure-the-case-of-mn-fe-sup-2-sup-alpo-sub-4-sub-oh-sub-2-sub-h-sub-2-sub-o
#1
Benedikt Röska, So-Hyun Park, Yusuke Yoshimori, Kenta Kimura, Tsuyoshi Kimura
An anomalous increase in the real part of dielectric response is observed in Mn<sub>0.5</sub>Fe<sub>0.5</sub>AlPO<sub>4</sub>(OH)<sub>2</sub>H<sub>2</sub>O while cooling to ~70 K. This is addressed to field-induced proton dynamics in a short hydrogen bond of 2.480(3) Å. The absence of discontinuities in heat capacity curves above the Néel temperature (T<sub>N</sub> ≈ 7 K) excludes a paraelectric to antiferroelectric phase transition...
June 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28632277/variable-temperature-and-high-pressure-crystal-chemistry-of-perovskite-formamidinium-lead-iodide-a-single-crystal-x-ray-diffraction-and-computational-study
#2
Shijing Sun, Zeyu Deng, Yue Wu, Fengxia Wei, Furkan Halis Isikgor, Federico Brivio, Michael W Gaultois, Jianyong Ouyang, Paul D Bristowe, Anthony K Cheetham, Gregor Kieslich
We investigate the variable temperature (100-450 K) and high-pressure (p = ambient - 0.74 GPa) crystal chemistry of the black perovskite formamidinium lead iodide, [(NH2)2CH]PbI3, using single crystal X-ray diffraction. In both cases we find a phase transition to a tetragonal phase. Our experimental results are combined with first principles calculations, providing information about the electronic properties of [(NH2)2CH]PbI3 as well as the most probable orientation of the [(NH2)2CH](+) cations.
June 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28631702/-the-frequency-of-ophthalmologic-manifestations-of-granulomatosis-with-polyangiitis-wegener-s-and-their-relationship-to-systemic-diseases
#3
D S Ismailova, P I Novikov, Ya O Grusha, Yu V Abramova, N M Bulanov, E A Makarov
AIM: To estimate the frequency of lesions in the organ of vision in granulomatosis with polyangiitis (GPA) (Wegener's) and to determine their relationship to systemic diseases. SUBJECTS AND METHODS: The retrospective study enrolled 218 patients followed up at the E.M. Tareyev Clinic of Nephrology, Internal and Occupational Diseases, with a diagnosis of GPA. The frequency and association of ophthalmic manifestations with systemic involvement were statistically analyzed using PASW Statistics 18...
2017: Terapevticheskiĭ Arkhiv
https://www.readbyqxmd.com/read/28630909/dynamic-fracture-of-tantalum-under-extreme-tensile-stress
#4
Bruno Albertazzi, Norimasa Ozaki, Vasily Zhakhovsky, Anatoly Faenov, Hideaki Habara, Marion Harmand, Nicholas Hartley, Denis Ilnitsky, Nail Inogamov, Yuichi Inubushi, Tetsuya Ishikawa, Tetsuo Katayama, Takahisa Koyama, Michel Koenig, Andrew Krygier, Takeshi Matsuoka, Satoshi Matsuyama, Emma McBride, Kirill Petrovich Migdal, Guillaume Morard, Haruhiko Ohashi, Takuo Okuchi, Tatiana Pikuz, Narangoo Purevjav, Osami Sakata, Yasuhisa Sano, Tomoko Sato, Toshimori Sekine, Yusuke Seto, Kenjiro Takahashi, Kazuo Tanaka, Yoshinori Tange, Tadashi Togashi, Kensuke Tono, Yuhei Umeda, Tommaso Vinci, Makina Yabashi, Toshinori Yabuuchi, Kazuto Yamauchi, Hirokatsu Yumoto, Ryosuke Kodama
The understanding of fracture phenomena of a material at extremely high strain rates is a key issue for a wide variety of scientific research ranging from applied science and technological developments to fundamental science such as laser-matter interaction and geology. Despite its interest, its study relies on a fine multiscale description, in between the atomic scale and macroscopic processes, so far only achievable by large-scale atomic simulations. Direct ultrafast real-time monitoring of dynamic fracture (spallation) at the atomic lattice scale with picosecond time resolution was beyond the reach of experimental techniques...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28630510/current-practices-of-awarding-graduation-honors-within-doctor-of-pharmacy-degree-programs
#5
Paul A DiPietro, Stacy L Longo, Beth E Welch, Daniel R Kennedy, Eric C Nemec
Objective. To survey the practices of awarding honors upon graduation with a doctor of pharmacy degree. Methods. College and school of pharmacy websites were systematically searched to identify if, and then how, graduation honors are awarded. Programs that offer graduation honors were categorized and quantified based upon grade point average (GPA) cutoffs, honors enrollment, research project completion, faculty vote, course failure considerations, and ethics code violations. Results. Of the 132 doctor of pharmacy programs reviewed, 86% (n=114) had accessible online resources and were included in data analysis...
May 2017: American Journal of Pharmaceutical Education
https://www.readbyqxmd.com/read/28630508/relationship-between-grit-with-academic-performance-and-attainment-of-postgraduate-training-in-pharmacy-students
#6
Adrian Jason L Palisoc, Rae R Matsumoto, Jackie Ho, Paul J Perry, Terrill T Tang, Eric J Ip
Objective. To determine if Grit-S scores correlate with academic success in a doctor of pharmacy (PharmD) program, as well as the pursuit and attainment of pharmacy postgraduate (residency or fellowship) training. Methods. A 28-item survey was administered to third- and fourth-year (P3 and P4) pharmacy students. Variables queried included Grit-S score, demographics, pharmacy experience prior to the PharmD program, and factors that may affect academic performance during didactic coursework. Didactic coursework GPA was used as a surrogate for academic success...
May 2017: American Journal of Pharmaceutical Education
https://www.readbyqxmd.com/read/28630301/potential-high-tc-superconducting-lanthanum-and-yttrium-hydrides-at-high-pressure
#7
Hanyu Liu, Ivan I Naumov, Roald Hoffmann, N W Ashcroft, Russell J Hemley
A systematic structure search in the La-H and Y-H systems under pressure reveals some hydrogen-rich structures with intriguing electronic properties. For example, LaH10 is found to adopt a sodalite-like face-centered cubic (fcc) structure, stable above 200 GPa, and LaH8 a C2/m space group structure. Phonon calculations indicate both are dynamically stable; electron phonon calculations coupled to Bardeen-Cooper-Schrieffer (BCS) arguments indicate they might be high-Tc superconductors. In particular, the superconducting transition temperature Tc calculated for LaH10 is 274-286 K at 210 GPa...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28628344/rituximab-induction-and-maintenance-treatment-in-patients-with-scleritis-and-granulomatosis-with-polyangiitis-wegener-s
#8
Caiyun You, Lina Ma, Andres F Lasave, C Stephen Foster
AIMS: To evaluate the efficacy and safety of rituximab (RTX) induction and maintenance treatment for patients with scleritis and granulomatosis with polyangiitis (GPA), Wegener's. METHODS: Nine patients (12 eyes) with scleritis with GPA who did not respond to corticosteroids and more than one immunosuppressive agent who received ongoing maintenance RTX treatment were identified. Demographics and outcome measures were recorded. RESULTS: Median follow-up time of 30 months (range, 15 to 87 months)...
June 19, 2017: Ocular Immunology and Inflammation
https://www.readbyqxmd.com/read/28628311/pushing-the-limits-of-oxygen-balance-in-1-3-4-oxadiazoles
#9
Qiong Yu, Ping Yin, Jiaheng Zhang, Chunlin He, Gregory Howard Imler, Damon A Parrish, Jean'ne M Shreeve
Gem-trinitromethyl groups were introduced into a 1,3,4-oxadiazole ring to give the first example of a bifunctionalized single five-membered ring with six nitro groups. 2,5-Bis(trinitromethyl)-1,3,4-oxadiazole (12) has a high calculated crystal density of 2.007 g cm-3 at 150 K and a very high positive oxygen balance (39.12%) which make it a strong candidate as a high energy dense oxidizer. The dihy-droxylammonium and dihydrazinium salts of bis(trinitromethyl)-1,3,4-oxadiazole (5 and 6) exhibit excel-lent detonation properties (5, vD = 9266 m s-1, P = 38...
June 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28627549/self-assembly-of-silver-i-based-high-energy-metal-organic-frameworks-he-mofs-at-ambient-temperature-and-pressure-synthesis-structure-and-superior-explosive-performance
#10
Cheng Shen, Yang Liu, Zhong-Qin Zhu, Yuan-Gang Xu, Ming Lu
Two new high-energy metal-organic frameworks (HE-MOFs), {Ag2(DNMAF)(H2O)2}n (1) and {Ag2(DNMAF)}n (2) were prepared using potassium 4,4'-bis(dinitromethyl)-3,3'-azofurazanate (K2DNMAF) in a self-assembly strategy. Compound 1 exhibits a 3D HE-MOF structure with coordinated water molecules. Compound 2 exhibits compact solvent-free 3D HE-MOFs. Both compounds show good thermostability (decomposition temperature (Td) of 211 and 218 °C) and superior detonation velocities (D) of 9673 m s(-1) and 10 242 m s(-1), detonation pressures (P) of 50...
June 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28627173/ternary-gold-hydrides-routes-to-stable-and-potentially-superconducting-compounds
#11
Martin Rahm, Roald Hoffmann, N W Ashcroft
In a search for gold hydrides, an initial discouraging result of no theoretical stability in any binary AuHn at P < 300 GPa was overcome by introducing alkali atoms as reductants. A set of AAuH2 compounds, A = Li, Na, K, Rb, and Cs, is examined; of these, certain K, Rb, and Cs compounds are predicted to be thermodynamically stable. All contain AuH2(-) molecular units and are semiconducting at P = 1 atm, and some form metallic and superconducting symmetrically bonded AuHAu sheets under compression. To induce metallicity by bringing the Au atoms closer together under ambient conditions, we examined alkaline earth ion substitution for two A, i...
June 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28626968/3d-printing-all-aromatic-polyimides-using-mask-projection-stereolithography-processing-the-nonprocessable
#12
Maruti Hegde, Viswanath Meenakshisundaram, Nicholas Chartrain, Susheel Sekhar, Danesh Tafti, Christopher B Williams, Timothy E Long
High-performance, all-aromatic, insoluble, engineering thermoplastic polyimides, such as pyromellitic dianhydride and 4,4'-oxydianiline (PMDA-ODA) (Kapton), exhibit exceptional thermal stability (up to ≈600 °C) and mechanical properties (Young's modulus exceeding 2 GPa). However, their thermal resistance, which is a consequence of the all-aromatic molecular structure, prohibits processing using conventional techniques. Previous reports describe an energy-intensive sintering technique as an alternative technique for processing polyimides with limited resolution and part fidelity...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28626548/nonomuraea-sp-atcc-55076-harbours-the-largest-actinomycete-chromosome-to-date-and-the-kistamicin-biosynthetic-gene-cluster
#13
Behnam Nazari, Clarissa C Forneris, Marcus I Gibson, Kyuho Moon, Kelsey R Schramma, Mohammad R Seyedsayamdost
Glycopeptide antibiotics (GPAs) have served as potent clinical drugs and as an inspiration to chemists in various disciplines. Among known GPAs, complestatin, chloropeptin, and kistamicin are unique in that they contain an unusual indole-phenol crosslink. The mechanism of formation of this linkage is unknown, and to date, the biosynthetic gene cluster of only one GPA with an indole-phenol crosslink, that of complestatin, has been identified. Here, we report the genome sequence of the kistamicin producer Nonomuraea sp...
April 1, 2017: MedChemComm
https://www.readbyqxmd.com/read/28626205/designing-an-antibacterial-acrylic-resin-using-the-cosolvent-method-effect-of-ethanol-on-the-optical-and-mechanical-properties-of-a-cold-cure-acrylic-resin
#14
Takashi Nezu, Futami Nagano-Takebe, Kazuhiko Endo
Antimicrobial cetylpyridinium chloride (CPC) has low miscibility with acrylic resin monomer but can be homogeneously mixed using ethanol as a cosolvent. This study investigated the effects of ethanol addition on the properties of a cold-cure acrylic resin. Ethanol was an excellent cosolvent for CPC and methyl methacrylate monomer (MMA), but the cured resin exhibited a strong change in coloration to yellow (ΔE*ab>8) and a drastically reduced bending strength (from 97 to 25 MPa) and elastic modulus (from 2...
June 15, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28623333/relation-between-the-co-o-bond-lengths-and-the-spin-state-of-co-in-layered-cobaltates-a-high-pressure-study
#15
Yi-Ying Chin, Hong-Ji Lin, Zhiwei Hu, Chang-Yang Kuo, Daria Mikhailova, Jenn-Min Lee, Shu-Chih Haw, Shin-An Chen, Walter Schnelle, Hirofumi Ishii, Nozomu Hiraoka, Yen-Fa Liao, Ku-Ding Tsuei, Arata Tanaka, Liu Hao Tjeng, Chien-Te Chen, Jin-Ming Chen
The pressure-response of the Co-O bond lengths and the spin state of Co ions in a hybrid 3d-5d solid-state oxide Sr2Co0.5Ir0.5O4 with a layered K2NiF4-type structure was studied by using hard X-ray absorption and emission spectroscopies. The Co-K and the Ir-L 3 X-ray absorption spectra demonstrate that the Ir(5+) and the Co(3+) valence states at ambient conditions are not affected by pressure. The Co Kβ emission spectra, on the other hand, revealed a gradual spin state transition of Co(3+) ions from a high-spin (S = 2) state at ambient pressure to a complete low-spin state (S = 0) at 40 GPa without crossing the intermediate spin state (S = 1)...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28621542/bonding-properties-of-aluminum-nitride-at-high-pressure
#16
Zhao Liu, Da Li, Shuli Wei, Wenjie Wang, Fubo Tian, Kuo Bao, Defang Duan, Hongyu Yu, Bingbing Liu, Tian Cui
Exploring the bonding properties and polymerization mechanism of stable polymeric nitrogen phases is the main goal of our high-pressure study. The pressure versus composition phase diagram of the Al-N system is established. In addition to the known Fm3̅m phase of AlN, a notable monoclinic phase with N6(6-) anion polymeric nitrogen chains for AlN3 in the pressure range from 43 to 85 GPa is predicted. Its energy density is up to 2.75 kJ·g(-1), and the weight ratio of nitrogen is nearly 61%, which make it potentially interesting for the industrial applications as a high energy density material...
June 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28621311/dependence-of-the-shape-of-graphene-nanobubbles-on-trapped-substance
#17
H Ghorbanfekr-Kalashami, K S Vasu, R R Nair, François M Peeters, M Neek-Amal
Van der Waals (vdW) interaction between two-dimensional crystals (2D) can trap substances in high pressurized (of order 1 GPa) on nanobubbles. Increasing the adhesion between the 2D crystals further enhances the pressure and can lead to a phase transition of the trapped material. We found that the shape of the nanobubble can depend critically on the properties of the trapped substance. In the absence of any residual strain in the top 2D crystal, flat nanobubbles can be formed by trapped long hydrocarbons (that is, hexadecane)...
June 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/28617248/young-s-modulus-and-indirect-morphological-analysis-of-bi2se3-nanoribbons-by-resonance-measurements
#18
Jelena Kosmaca, Liga Jasulaneca, Raimonds Meija, Jana Andzane, Marina Romanova, Gunta Kunakova, Donats Erts
An electrostatically induced resonance behaviour of individual topological insulator Bi<sub>2</sub>Se<sub>3</sub> nanoribbons grown by a catalyst free vapour-solid synthesis was studied <i>in-situ</i> by scanning electron microscopy. It was demonstrated that the relation between the resonant frequencies of vibrations in orthogonal planes can be applied to distinguish the nanoribbons with rectangular cross-sections from the nanoribbons having step-like morphology (terraces)...
June 15, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28615686/formation-and-electronic-properties-of-palladium-hydrides-and-palladium-rhodium-dihydride-alloys-under-pressure
#19
Xiao Yang, Huijian Li, Rajeev Ahuja, Taewon Kang, Wei Luo
We present the formation possibility for Pd-hydrides and Pd-Rh hydrides system by density functional theory (DFT) in high pressure upto 50 GPa. Calculation confirmed that PdH2 in face-centered cubic (fcc) structure is not stable under compression that will decomposition to fcc-PdH and H2. But it can be formed under high pressure while the palladium is involved in the reaction. We also indicate a probably reason why PdH2 can not be synthesised in experiment due to PdH is most favourite to be formed in Pd and H2 environment from ambient to higher pressure...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28615663/hydrostatic-pressure-effects-on-the-static-magnetism-in-eu-fe0-925co0-075-2as2
#20
W T Jin, J-P Sun, G Z Ye, Y Xiao, Y Su, K Schmalzl, S Nandi, Z Bukowski, Z Guguchia, E Feng, Z Fu, J-G Cheng
EuFe2As2-based iron pnictides are quite interesting compounds, due to the two magnetic sublattices in them and the tunability to superconductors by chemical doping or application of external pressure. The effects of hydrostatic pressure on the static magnetism in Eu(Fe0.925Co0.075)2As2 are investigated by complementary electrical resistivity, ac magnetic susceptibility and single-crystal neutron diffraction measurements. A specific pressure-temperature (P-T) phase diagram of Eu(Fe0.925Co0.075)2As2 is established...
June 14, 2017: Scientific Reports
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