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https://www.readbyqxmd.com/read/28225597/interfacial-design-of-ternary-mixed-matrix-membranes-containing-pebax-1657-silver-nanopowder-bmim-bf4-for-improved-co2-separation-performance
#1
Ehsan Ghasemi Estahbanati, Mohammadreza Omidkhah, Abtin Ebadi Amooghin
In this research, Pebax1657 as an organic phase and silver nanoparticles as an inorganic phase were used for preparation of binary mixed matrix membranes (MMMs). Silver nanoparticles as a filler could enter the polymer chains and enhance the gas permeability by increasing the fractional free volume of membranes. Afterwards, ternary MMMs were fabricated by addition of 1-Butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]) ionic liquid, in order to have better polymer/filler adhesion and eliminate interfacial defects and non-selective voids...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28203033/the-phase-transition-of-pb8f14i2
#2
Matthias Weil
ABSTRACT: The reversible phase transition of Pb8F14I2 is of continuous type and takes place at about 107 °C as monitored by temperature-dependent single crystal and powder X-ray diffraction measurements, optical microscopy, and differential scanning calorimetry. The low-temperature ferroelastic phase crystallizes in the orthorhombic crystal system (23 °C, Bmmb, Z = 2, a = 6.0699(6) Å, b = 6.0165(6) Å, c = 25.077(2) Å, 1487 structure factors, 41 parameter, R(F(2) ) = 0...
2017: Monatshefte Für Chemie
https://www.readbyqxmd.com/read/28108877/a-moderated-mediation-model-of-hiv-related-stigma-depression-and-social-support-on-health-related-quality-of-life-among-incarcerated-malaysian-men-with-hiv-and-opioid-dependence
#3
Roman Shrestha, Michael Copenhaver, Alexander R Bazazi, Tania B Huedo-Medina, Archana Krishnan, Frederick L Altice
Although it is well established that HIV-related stigma, depression, and lack of social support are negatively associated with health-related quality of life (HRQoL) among people living with HIV (PLH), no studies to date have examined how these psychosocial factors interact with each other and affect HRQoL among incarcerated PLH. We, therefore, incorporated a moderated mediation model (MMM) to explore whether depression mediates the effect of HIV-related stigma on HRQoL as a function of the underlying level of social support...
January 20, 2017: AIDS and Behavior
https://www.readbyqxmd.com/read/28105384/sample-mmm-manuscript-for-submission-to-aip-advances-transient-line-starting-analysis-of-the-ultra-high-speed-pmsm
#4
Wenjie Cheng, Wei Li, Ling Xiao, Ming Li, Yongsheng Tian, Yanhua Sun, Lie Yu
Aiming at the ultra high speed permanent magnet synchronous motor (PMSM) supported by gas foil bearings (GFBs), this paper calculates the transient line starting of the motor. Firstly, the start effect of the rotor composed of cylindrical PM and stainless steel sleeve is studied. Then, in order to enhance the start torque, copper ring, nickel ring and copper squirrel-cage are introduced in the rotor and their start effect are analysed, respectively. It can be found that the rotor including nickel ring can be accelerated to set speed, but all the other rotors are failed due to the higher PM and braking torques...
May 2017: AIP Advances
https://www.readbyqxmd.com/read/28047530/su-f-p-45-clinical-experience-with-radiation-dose-reduction-of-ct-examinations-using-iterative-reconstruction-algorithms
#5
V Weir, J Zhang
PURPOSE: Iterative reconstruction (IR) algorithms have been adopted by medical centers in the past several years. IR has a potential to substantially reduce patient dose while maintaining or improving image quality. This study characterizes dose reductions in clinical settings for CT examinations using IR. METHODS: We retrospectively analyzed dose information from patients who underwent abdomen/pelvis CT examinations with and without contrast media in multiple locations of our Healthcare system...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/27989149/nontrivial-recurrent-intergrowth-structure-and-unusual-magnetic-behavior-of-intermetallic-compound-fe32-%C3%AE-ge33as2
#6
Roman A Khalaniya, Andrei V Mironov, Valeriy Yu Verchenko, Anton Jesche, Alexander A Tsirlin, Andrei V Shevelkov
A new phase Fe32+δGe33As2 (δ ≤ 0.136) was obtained by two-step synthesis from the elements. Fe32+δGe33As2 crystallizes in its own structure type (space group P6/mmm, Z = 1, a = 11.919(3) Å, c = 7.558(4) Å) that can be described as a recurrent two-dimensional intergrowth of two intermetallic structure types, MgFe6Ge6 and Co2Al5. Their blocks are represented by infinite columns in the structure. No visible structural changes were observed in the temperature range from 10 to 300 K. At 125 K, Fe32+δGe33As2 undergoes an antiferromagnetic-like transition, while above 150 K it shows a typical Curie-Weiss paramagnetic behavior...
December 19, 2016: Inorganic Chemistry
https://www.readbyqxmd.com/read/27933967/ionic-liquids-as-the-mofs-polymer-interfacial-binder-for-efficient-membrane-separation
#7
Rijia Lin, Lei Ge, Hui Diao, Victor Rudolph, Zhonghua Zhu
Obtaining strong interfacial affinity between filler and polymer is critical to the preparation of mixed matrix membranes (MMMs) with high separation efficiency. However, it is still a challenge for micron-sized metal organic frameworks (MOFs) to achieve excellent compatibility and defect-free interface with polymer matrix. Thin layer of ionic liquid (IL) was immobilized on micron-sized HKUST-1 to eliminate the interfacial nonselective voids in MMMs with minimized free ionic liquid (IL) in polymer matrix, and then the obtained IL decorated HKUST-1 was incorporated into 4,4'-(hexafluoroisopropylidene)diphthalic anhydride-2,3,5,6-tetramethyl-1,3-phenyldiamine (6FDA-Durene) to fabricate MMMs...
November 23, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27918299/monoclinic-to-orthorhombic-phase-transition-of-the-hexamethylenetetramine-2-methylbenzoic-acid-1-2-cocrystal-with-temperature-dependent-dynamic-molecular-disorder
#8
Tze Shyang Chia, Ching Kheng Quah
As a function of temperature, the hexamethylenetetramine-2-methylbenzoic acid (1/2) cocrystal, C6H12N4·2C8H8O2, undergoes a reversible structural phase transition. The orthorhombic high-temperature phase in the space group Pccn has been studied in the temperature range between 165 and 300 K. At 164 K, a t2 phase transition to the monoclinic subgroup P21/c space group occurs; the resulting twinned low-temperature phase was investigated in the temperature range between 164 and 100 K. The domains in the pseudomerohedral twin are related by a twofold rotation corresponding to the matrix (100/0-10/00-1...
December 1, 2016: Acta Crystallographica. Section C, Structural Chemistry
https://www.readbyqxmd.com/read/27907960/multimodality-monitoring-illuminating-the-comatose-human-brain
#9
Charles L Francoeur, Margaret Pain, Stephan A Mayer
The field of neurocritical care has evolved tremendously in recent years, a development explained vastly by the advent of neurophysiological monitoring. From basic intracranial pressure measurements to brain tissue oxygenation, microdialysis, cerebral blood flow (CBF), and surface and intracortical electroencephalography (EEG), our ability to detect and control physiologic endpoints of brain function in comatose patients has grown substantially. The integration of these data gave birth to the concept of multimodality monitoring (MMM)...
December 2016: Seminars in Neurology
https://www.readbyqxmd.com/read/27896347/first-principles-study-of-pressure-induced-structural-phase-transitions-in-mnf2
#10
S López-Moreno, A H Romero, J Mejía-López, A Muñoz
In this work we report a complete structural and magnetic characterization of crystalline MnF2 under pressure obtained using first principle calculations. Density functional theory was used as the theoretical framework, within the generalized gradient approximation plus the Hubbard formalism (GGA+U) necessary to describe the strong correlations present in this material. The vibrational, the magnetic exchange couplings and the structural characterization of MnF2 in the rutile ground state structure and potential high pressure phases are reported...
December 7, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27882901/tetragonal-to-triclinic-structural-transition-in-the-prototypical-cescsi-induced-by-a-two-step-magnetic-ordering-a-temperature-dependent-neutron-diffraction-study-of-cescsi-cescge-and-lascsi
#11
C Ritter, A Provino, P Manfrinetti, A K Pathak
An investigation on the ground state magnetism of CeScSi, CeScGe (tetragonal CeScSi-type, tI12, space group I4/mmm) by temperature-dependent powder neutron diffraction has been carried out, as debated and controversial data regarding the low temperature magnetic behaviours of these two compounds were reported. Our studies reveal that, while cooling, long-range magnetic ordering in CeScSi and CeScGe takes place by a two-step process. A first transition leads to a magnetic structure with the Ce moments aligned ferromagnetically onto two neighbouring tetragonal basal a-b planes of the CeScSi-type structure; the double layers are then antiferromagnetically coupled to each other along the c-axis...
February 1, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27881407/prophylactic-and-therapeutic-treatment-with-the-flavonone-sakuranetin-ameliorates-lps-induced-acute-lung-injury
#12
Márcia Isabel Bittencourt-Mernak, Nathalia M Pinheiro, Fernanda P R Santana, Marina P Guerreiro, Beatriz M Saraiva-Romanholo, Simone S Grecco, Luciana C Caperuto, Raphael J F Felizardo, Niels O S Câmara, Iolanda F L C Tibério, Mílton A Martins, João Henrique G Lago, Carla M Prado
Sakuranetin is the main isolate flavonoid from Baccharis retusa (Asteraceae) leaves and exhibits anti-inflammatory and antioxidative activities. Acute respiratory distress syndrome is an acute failure of the respiratory system for which effective treatment is urgently necessary. This study investigated the preventive and therapeutic effects of sakuranetin on lipopolysaccharide (LPS)-induced acute lung injury (ALI) in mice. Animals were treated with intranasal sakuranetin 30 min before or 6 h after instillation of LPS...
February 1, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/27740772/synthesis-and-characterization-of-cs1-xti2te2o-x-%C3%A2-0-2-electron-doping-by-te-resulting-in-a-layered-metal
#13
Martin Valldor, Patrick Merz, Yurii Prots, Yves Watier, Walter Schnelle
Reacting Cs2O1.3, TiTe, TiO2, and Te under inert conditions gives powders of Cs1-xTi2Te2O (x ≈ 0.2). Small single crystals of the same phase were obtained from a CsCl salt melt in closed ampoules. This cesium dititanium ditelluride oxide (P4/mmm, a = 4.0934(3) Å, c = 8.9504(9) Å) is isostructural to CeCr2Si2C and contains layers of face-sharing trans-TiTe4O2 octahedra that are separated by Cs. As Ti occupies only one crystallographic site, its average oxidation state is +2.6, for the Cs deficit x = 0.2...
November 7, 2016: Inorganic Chemistry
https://www.readbyqxmd.com/read/27723300/mixed-matrix-membranes-containing-carbon-nanotubes-composite-with-hydrogel-for-efficient-co2-separation
#14
Haiyang Zhang, Ruili Guo, Jinpeng Hou, Zhong Wei, Xueqin Li
In this study, a carbon nanotubes composite coated with N-isopropylacrylamide hydrogel (NIPAM-CNTs) has been synthesized. Mixed matrix membranes (MMMs) were fabricated by incorporating NIPAM-CNTs composite filler into poly(ether-block-amide) (Pebax® MH 1657) matrix for efficient CO2 separation. The as-prepared NIPAM-CNTs composite filler mainly plays two roles: i) The extraordinary smooth one-dimensional nanochannels of CNTs act as the highways to accelerate CO2 transport through membranes, increasing CO2 permeability; ii) The NIPAM hydrogel layer coated on the outer walls of CNTs acts as the super water absorbent to increase water content of membranes, appealing both CO2 permeability and CO2/gas selectivity...
October 10, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27723054/selection-of-a-monoclonal-antibody-by-elisa-immunoblotting-and-quartz-crystal-microbalance-technology-for-immunohistochemical-detection-of-mycoplasma-mycoides-subsp-mycoides
#15
Mirella Luciani, Gisella Armillotta, Laura Manna, Antonella Ciarelli, Tiziana Di Febo, Ivanka Krasteva, Attilio Pini, Flavio Sacchini, Anna Rita D'Angelo
An immunohistochemical (IHC) technique was optimised using a monoclonal antibody (MAb) to detect Mycoplasma mycoides subsp. mycoides (Mmm), the agent of Contagious Bovine Pleuropneumonia (CBPP), in sections of lung tissue. A panel of MAbs was produced and screened for Mmm speci city and for cross-reactivity against other mycoplasmas belonging and not belonging to the Mycoplasma mycoides cluster, using in parallel indirect ELISA (i-ELISA) and Immunoblotting (IB). Based on i-ELISA and IB characterization data, 1 MAb (clone 3G10E7) was selected and its highest a nity vs Mmm was con rmed by the Quartz Crystal Microbalance (QCM) technology...
July 15, 2016: Veterinaria Italiana
https://www.readbyqxmd.com/read/27722617/crystal-structures-and-superconductivity-of-technetium-hydrides-under-pressure
#16
Xiaofeng Li, Hanyu Liu, Feng Peng
Guided by a simple strategy in search of new superconducting materials, we have performed extensive simulations on crystal structures and electronic properties of Tc-H compounds at high pressures. Three stoichiometries, namely TcH, TcH2, and TcH3, were predicted to be stable under high pressure. The chemical bonding characters of Tc-H compounds were investigated by introducing the electron localization function and electronic projected density of states, which show that the stable Tc-H compounds including TcH, TcH2 and TcH3 are all classified as ionic crystals as a result of Tc → H charge transfer...
October 10, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27703258/new-low-flux-mixed-matrix-membranes-that-offer-superior-removal-of-protein-bound-toxins-from-human-plasma
#17
Denys Pavlenko, Esmée van Geffen, Mies J van Steenbergen, Griet Glorieux, Raymond Vanholder, Karin G F Gerritsen, Dimitrios Stamatialis
Hemodialysis is a widely available and well-established treatment for patients with End Stage Renal Disease (ESRD). However, although life-sustaining, patient mortality rates are very high. Several recent studies corroborated the link between dialysis patients' outcomes and elevated levels of protein-bound uremic toxins (PBUT) that are poorly removed by conventional hemodialysis. Therefore, new treatments are needed to improve their removal. Recently, our group showed that the combination of dialysis and adsorption on one membrane, the mixed matrix membrane (MMM), can effectively remove those toxins from human plasma...
October 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27698310/effect-of-al-and-ca-co-doping-in-the-presence-of-te-in-superconducting-ybco-whiskers-growth
#18
Lise Pascale, Marco Truccato, Lorenza Operti, Angelo Agostino
High-Tc superconducting cuprates (HTSC) such as YBa2Cu3O7 - x (YBCO) are promising candidates for solid-state THz applications based on stacks of intrinsic Josephson junctions (IJJs) with atomic thickness. In view of future exploitation of IJJs, high-quality superconducting YBCO tape-like single crystals (whiskers) have been synthesized from Ca-Al-doped precursors in the presence of Te. The main aim of this paper is to determine the importance of the simultaneous use of Al, Te and Ca in promoting YBCO whiskers growth with good superconducting properties (Tc = 79-84 K)...
October 1, 2016: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
https://www.readbyqxmd.com/read/27696654/cell-specific-nitrogen-and-carbon-fixation-of-cyanobacteria-in-a-temperate-marine-system-baltic-sea
#19
I Klawonn, N Nahar, J Walve, B Andersson, M Olofsson, J B Svedén, S Littmann, M J Whitehouse, M M M Kuypers, H Ploug
We analysed N2 - and carbon (C) fixation in individual cells of Baltic Sea cyanobacteria by combining stable isotope incubations with secondary ion mass spectrometry (SIMS). Specific growth rates based on N2 - and C-fixation were higher for cells of Dolichospermum spp. than for Aphanizomenon sp. and Nodularia spumigena. The cyanobacterial biomass, however, was dominated by Aphanizomenon sp., which contributed most to total N2 -fixation in surface waters of the Northern Baltic Proper. N2 -fixation by Pseudanabaena sp...
December 2016: Environmental Microbiology
https://www.readbyqxmd.com/read/27687547/chemotherapy-impedes-in%C3%A2-vitro-microcirculation-and-promotes-migration-of-leukemic-cells-with-impact-on-metastasis
#20
Sruti V Prathivadhi-Bhayankaram, Jianhao Ning, Michael Mimlitz, Carolyn Taylor, Erin Gross, Michael Nichols, Jochen Guck, Andrew E Ekpenyong
Although most cancer drugs target the proliferation of cancer cells, it is metastasis, the complex process by which cancer cells spread from the primary tumor to other tissues and organs of the body where they form new tumors, that leads to over 90% of all cancer deaths. Thus, there is an urgent need for anti-metastasis therapy. Surprisingly, emerging evidence suggests that certain anti-cancer drugs such as paclitaxel and doxorubicin can actually promote metastasis, but the mechanism(s) behind their pro-metastatic effects are still unclear...
October 28, 2016: Biochemical and Biophysical Research Communications
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