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https://www.readbyqxmd.com/read/29163888/theoretical-predictions-suggest-carbon-dioxide-phases-iii-and-vii-are-identical
#1
Watit Sontising, Yonaton N Heit, Jessica L McKinley, Gregory J O Beran
Solid carbon dioxide exhibits a rich phase diagram at high pressures. Metastable phase III is formed by compressing dry ice above ∼10-12 GPa. Phase VII occurs at similar pressures but higher temperatures, and its stability region is disconnected from III on the phase diagram. Comparison of large-basis-set quasi-harmonic second-order Møller-Plesset perturbation theory calculations and experiment suggests that the long-accepted structure of phase III is problematic. The experimental phase III and VII structures both relax to the same phase VII structure...
November 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29157203/survival-time-following-resection-of-intracranial-metastases-from-nsclc-development-and-validation-of-a-novel-nomogram
#2
Xiaoyu Ji, Yingjie Zhuang, Xiangye Yin, Qiong Zhan, Xinli Zhou, Xiaohua Liang
BACKGROUND: Brain metastases (BM) from non-small cell lung cancer (NSCLC) are the most frequent intracranial tumors. To identify patients who might benefit from intracranial surgery, we compared the six existing prognostic indexes(PIs) and built a nomogram to predict the survival for NSCLC with BM before they intended to receive total intracranial resection in China. METHODS: First, clinical data of NSCLC presenting with BM were retrospectively reviewed. All of the patients had received total intracranial resection and were randomly distributed to developing cohort and validation cohort by 2:1...
November 21, 2017: BMC Cancer
https://www.readbyqxmd.com/read/29148983/densification-of-chlorine-doped-continuous-cnt-sheet-polyvinylidene-fluoride-sandwich-film-and-improvement-of-mechanical-and-dielectric-properties
#3
Jiyong Liang, Yizhuo Gu, Zhenchong Zhang, Shaokai Wang, Min Li, Zuoguang Zhang
The compacting structure of chlorine-doped continuous CNT sheet/polyvinylidene fluoride (Cl-CNT sheet/PVDF) was successfully optimized by means of hot-press treatment to improve mechanical and dielectric properties with high densification degree. Then, the densified Cl-CNT sheet/PVDF dielectric layer was inserted between two PVDF insulating layers to fabricate sandwich composite. It is found that the dielectric and mechanical properties are effectively enhanced, with the dielectric permittivity of 40.4 (@102 Hz), dielectric loss of 0...
November 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29145964/does-the-position-of-the-scapula-in-relation-to-the-glenopolar-angle-change-the-preferred-treatment-of-extra-articular-fractures
#4
Pedro José Labronici, Augusto Khede Tavares, Erasmo Cavalheiro Canhoto, Vincenzo Giordano, Robinson Esteves Santos Pires, Luiz Henrique Penteado da Silva, Marcelo Bezerra Mathias, Isabela de Miranda Rosa
OBJECTIVE: To analyse the glenopolar angle (GPA) at different inclinations of the scapula using 3D CT, to test the hypothesis that the result could change the indication from conservative treatment to surgery. MATERIALS AND METHODS: Analysis of 30 3D CT images of patients' scapulae, measuring the GPA. The GPA was measured with scapulae at 0(°) and at 20(°) and 30(°) of internal and external rotation. Angles were compared by age, sex and examiner for the different angles of rotation of the scapulae...
October 2017: Injury
https://www.readbyqxmd.com/read/29144130/structural-phase-transitions-in-ptin2-at-high-pressure-a-theoretical-investigation
#5
P Modak, Ashok K Verma
A study of the bonding and electronic properties of intermetallics under pressure is crucial in the design and development of novel materials for useful applications. These properties are largely controlled by the underlying crystal structures. Here we investigated the high-pressure structural behavior of PtIn2 using crystal structure search calculations, which efficiently combine evolutionary algorithms and state-of-the-art density functional theory. Three new crystal structures, namely, Fe2B-type (I4/mcm, Z = 2), cotunnite-type (Pnma, Z = 4), and monoclinic (C2/m, Z = 2), are proposed at about 9...
November 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29142214/plastic-deformation-mechanisms-in-a-severely-deformed-fe-ni-al-c-alloy-with-superior-tensile-properties
#6
Yan Ma, Muxin Yang, Ping Jiang, Fuping Yuan, Xiaolei Wu
Nanostructured metals have high strength while they usually exhibit limited uniform elongation. While, a yield strength of approximately 2.1 GPa and a uniform elongation of about 26% were achieved in a severely deformed Fe-24.8%Ni-6.0%Al-0.38%C alloy in the present work. The plastic deformation mechanisms for the coarse-grained (CG) sample and the cold-rolled (CR) samples of this alloy were investigated by a series of mechanical tests and microstructure characterizations before and after tensile tests. No obvious phase transformation was observed during the tensile deformation for the CG sample, and the plastic deformation was found to be mainly accommodated by deformation twins and dislocation behaviors...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29141438/synthesis-and-stability-of-hydrogen-selenide-compounds-at-high-pressure
#7
Edward J Pace, Jack Binns, Miriam Peña Alvarez, Philip Dalladay-Simpson, Eugene Gregoryanz, Ross T Howie
The observation of high-temperature superconductivity in hydride sulfide (H2S) at high pressures has generated considerable interest in compressed hydrogen-rich compounds. High-pressure hydrogen selenide (H2Se) has also been predicted to be superconducting at high temperatures; however, its behaviour and stability upon compression remains unknown. In this study, we synthesize H2Se in situ from elemental Se and molecular H2 at pressures of 0.4 GPa and temperatures of 473 K. On compression at 300 K, we observe the high-pressure solid phase sequence (I-I'-IV) of H2Se through Raman spectroscopy and x-ray diffraction measurements, before dissociation into its constituent elements...
November 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29140700/high-pressure-behavior-of-silver-fluorides-up-to-40-gpa
#8
Adam Grzelak, Jakub Gawraczyński, Tomasz Jaroń, Dominik Kurzydłowski, Armand Budzianowski, Zoran Mazej, Piotr J Leszczyński, Vitali B Prakapenka, Mariana Derzsi, Viktor V Struzhkin, Wojciech Grochala
A combined experimental-theoretical study of silver(I) and silver(II) fluorides under high pressure is reported. For Ag(I), the CsCl-type structure is stable to at least 39 GPa; the overtone of the IR-active mode is seen in the Raman spectrum. Its Ag(II)F2 sibling is a unique compound in many ways: it is more covalent than other known difluorides, crystallizes in a layered structure, and is enormously reactive. Using X-ray diffraction and guided by theoretical calculations (density functional theory), we have been able to elucidate crystal structures of high-pressure polymorphs of AgF2...
November 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29140089/effects-of-variable-boron-concentration-on-the-properties-of-superhard-tungsten-tetraboride
#9
Georgiy Akopov, Inwhan Roh, Zachary C Sobell, Michael T Yeung, Lisa Pangilinan, Christopher L Turner, Richard B Kaner
Tungsten tetraboride is an inexpensive, superhard material easily prepared at ambient pressure. Unfortunately, there are relatively few compounds in existence that crystallize in the same structure as tungsten tetraboride. Furthermore, the lack of data in the tetraboride phase space limits the discovery of any new superhard compounds that also possess high incompressibility and a three-dimensional boron network that withstands shear. Thus, the focus of the work here is to chemically probe the range of thermodynamically stable tetraboride compounds with respect to both the transition metal and the boron content...
November 15, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29140077/superior-robust-ultra-thin-single-crystalline-silicon-carbide-membrane-as-a-versatile-platform-for-biological-applications
#10
Tuan-Khoa Nguyen, Hoang-Phuong Phan, Harshad Kamble, Raja Vadivelu, Toan Khac Dinh, Alan Iacopi, Glenn Walker, Leonie Hold, Nam-Trung Nguyen, Dzung Viet Dao
Micro-machined membranes are promising platforms for cell culture thanks to their miniaturization and integration capabilities. Possessing chemical inertness, bio compatibility and integration, silicon carbide (SiC) membranes have attracted great interest towards biological applications. In this paper, we present the batch fabrication, mechanical characterizations, and cell culture demonstration of robust ultra-thin epitaxial deposited SiC membranes. The as-fabricated ultra-thin SiC membranes, with an ultra-high aspect ratio (length/thickness) of up to 20,000, possess high a fracture strength up to 2...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29139157/seronegative-granulomatosis-with-polyangiitis-presenting-with-multiple-cranial-nerve-palsies
#11
Eunhye Lee, Jynkyun Park, Seung Hong Choi, Sung-Hye Park
Granulomatosis with polyangiitis (GPA), previously known as Wegener's granulomatosis (WG), is a rare systemic disease characterized by necrotizing granulomas and vasculitis that usually presents in the respiratory tract and renal system. Here, we report a case of anti-neutrophil cytoplasmic antibody (ANCA)-negative GPA with diagnostic difficulties. Neurologic involvement in GPA is not uncommon, with up to 50% of patients manifesting with neurologic defects; however, it is usually a late event. This patient was a 50-year-old man whose first manifestation was multiple neurologic defects without respiratory or renal symptoms...
November 14, 2017: Neuropathology: Official Journal of the Japanese Society of Neuropathology
https://www.readbyqxmd.com/read/29136304/reversible-polymerization-of-adamantane-type-p4n10-10-anions-to-honeycomb-type-p2n5-5-layers-under-high-pressure
#12
Eva-Maria Bertschler, Robin Niklaus, Wolfgang Schnick
The high-pressure polymorph Li5P2N5 of Li10P4N10 (= "2 Li5P2N5") was synthesized by high-pressure/high-temperature reaction of LiPN2 and Li7PN4 or beta-Li10P4N10 at 9 GPa, using the Li3N self-flux method in a Walker-type multianvil assembly. Li5P2N5 is the first lithium nitridophosphate with a layered structure and is made up of corner sharing PN4 tetrahedra forming a corrugated honeycomb-type layer of linked sechser-rings in chair conformation. The arrangement of the P atoms is analogous to that of black phosphorus...
November 14, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29136013/monomer-conversion-dimensional-stability-strength-modulus-surface-apatite-precipitation-and-wear-of-novel-reactive-calcium-phosphate-and-polylysine-containing-dental-composites
#13
Kanokrat Kangwankai, Sarah Sani, Piyaphong Panpisut, Wendy Xia, Paul Ashley, Haralampos Petridis, Anne Margaret Young
PURPOSE: The aim was to assess monomer conversion, dimensional stability, flexural strength / modulus, surface apatite precipitation and wear of mono / tri calcium phosphate (CaP) and polylysine (PLS)-containing dental composites. These were formulated using a new, high molecular weight, fluid monomer phase that requires no polymerisation activator. MATERIALS AND METHODS: Urethane and Polypropylene Glycol Dimethacrylates were combined with low levels of an adhesion promoting monomer and a light activated initiator...
2017: PloS One
https://www.readbyqxmd.com/read/29135235/estimating-the-strength-of-single-chitin-nanofibrils-via-sonication-induced-fragmentation
#14
Yu Bamba, Yu Ogawa, Tsuguyuki Saito, Lars A Berglund, Akira Isogai
We report the mechanical strength of native chitin nanofibrils. Highly crystalline α-chitin nanofibrils were purified from filaments produced by a microalgae Phaeocystis globosa, and two types of β-chitin nanofibrils were purified from pens of a squid Loligo bleekeri and tubes of a tubeworm Lamellibrachia satsuma, with relatively low and high crystallinity, respectively. These chitin nanofibrils were fully dispersed in water. Strength of individualized nanofibrils was estimated using cavitation-induced tensile fracture of nanoscale filaments in a liquid medium...
November 14, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29133910/time-resolved-diffraction-of-shock-released-sio2-and-diaplectic-glass-formation
#15
A E Gleason, C A Bolme, H J Lee, B Nagler, E Galtier, R G Kraus, R Sandberg, W Yang, F Langenhorst, W L Mao
Understanding how rock-forming minerals transform under shock loading is critical for modeling collisions between planetary bodies, interpreting the significance of shock features in minerals and for using them as diagnostic indicators of impact conditions, such as shock pressure. To date, our understanding of the formation processes experienced by shocked materials is based exclusively on ex situ analyses of recovered samples. Formation mechanisms and origins of commonly observed mesoscale material features, such as diaplectic (i...
November 14, 2017: Nature Communications
https://www.readbyqxmd.com/read/29133373/arabidopsis-actin-depolymerizing-factor3-is-required-for-controlling-aphid-feeding-from-the-phloem
#16
Hossain A Mondal, Joe Louis, Lani Archer, Monika Patel, Vamsi J Nalam, Sujon Sarowar, Vishala Sivapalan, Douglas D Root, Jyoti Shah
The actin cytoskeleton network has an important role in plant cell growth, division and stress response. Actin-depolymerizing factors (ADFs) are a group of actin-binding proteins that contribute to reorganization of the actin network. Here we show that the Arabidopsis thaliana ADF3 is required in the phloem for controlling infestation by Myzus persicae Sülzer, commonly known as the green peach aphid (GPA), which is an important phloem sap-consuming pest of more than fifty plant families. In agreement with a role for the actin-depolymerizing function of ADF3 in defense against the GPA, we show that resistance in adf3 was restored by overexpression of the related ADF4, and the actin cytoskeleton destabilizers, cytochalasin D and latrunculin B...
November 13, 2017: Plant Physiology
https://www.readbyqxmd.com/read/29131636/template-guided-assembly-of-silk-fibroin-on-cellulose-nanofibers-for-robust-nanostructures-with-ultrafast-water-transport
#17
Rui Xiong, Ho Shin Kim, Shuaidi Zhang, Sunghan Kim, Volodymyr F Korolovych, Ruilong Ma, Yaroslava G Yingling, Canhui Lu, Vladimir V Tsukruk
The construction of multilength scaled hierarchical nanostructures from diverse natural components is critical in the progress toward all-natural nanocomposites with structural robustness and versatile added functionalities. Here, we report a spontaneous formation of peculiar "shish kebab" nanostructures with the periodic arrangement of silk fibroin domains along straight segments of cellulose nanofibers. We suggest that the formation of these shish kebab nanostructures is facilitated by the preferential organization of heterogeneous (β-sheets and amorphous silk) domains along the cellulose nanofiber driven by modulated axial distribution of crystalline planes, hydrogen bonding, and hydrophobic interactions as suggested by all-atom molecular dynamic simulations...
November 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/29130891/nonlinear-modeling-of-crystal-system-transition-of-black-phosphorus-using-continuum-dft-model
#18
AliReza Setoodeh, Hamed Farahmand
In this paper, nonlinear behavior of black phosphorus crystals is investigated in tandem with dispersion corrected density functional theory (DFT-D) analysis under uniaxial loading. According to the distinguished anisotropic behavior of black phosphorus due to its morphological anisotropy, a hyperelastic anisotropic (HA) model named continuum-DFT is established to predict nonlinear behavior of the material. In this respect, uniaxial tensile Cauchy stresses are employed on both the DFT-D and HA models along zig-zag direction...
November 13, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29128519/genetic-structure-of-two-erythrocyte-binding-antigens-of-plasmodium-falciparum-reveals-a-contrasting-pattern-of-selection
#19
Pramita Chowdhury, Srikanta Sen, Sumana Datta Kanjilal, Sanghamitra Sengupta
Erythrocyte binding antigens 175 (EBA-175) and 140 (EBA-140) play key roles in erythrocyte invasion by binding to glycophorin A (GPA) and C (GPC) respectively in human malaria. Since antigenic variation in malaria endemic region is a major barrier to development of effective vaccine, we explore the nature and pattern of sequence diversity of these two vaccine candidates in Kolkata, India. Population genetic parameters based on parasite sequences representing region II of Pfeba-175 and Pfeba-140 genes were estimated using DnaSP V...
November 8, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/29125298/surface-initiated-ring-opening-metathesis-polymerization-of-dicyclopentadiene-from-the-vapor-phase
#20
Ian Njoroge, Paul A Kempler, Xuanli Deng, Steven T Arnold, G Kane Jennings
Surface-tethered polydicyclopentadiene (pDCPD) films were prepared on gold and silicon substrates via surface-initiated ring-opening polymerization (SI-ROMP) of dicyclopentadiene (DCPD). The films were grown utilizing monomer in both the vapor phase and the solution phase with the former process exhibiting rapid kinetics producing ∽ 400 nm thick pDCPD films in less than 1 min of polymerization. No significant differences in thickness were observed for films grown from monomer in the vapor phase with the different isomers (exo and endo) of DCPD...
November 10, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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