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https://www.readbyqxmd.com/read/29161795/superior-mesenteric-artery-syndrome-combined-with-renal-nutcracker-syndrome-in-a-young-male-a-case-report
#1
Myung Jin Oh
Superior mesenteric artery (SMA) syndrome is one of the rare causes of small bowel obstruction. It develops following a marked decrease in the angle between SMA and the abdominal aorta due to weight loss, anatomical anomalies, or following surgeries. Nutcracker syndrome in the left renal vein may also occur following a decrease in the aortomesenteric angle. Though SMA syndrome and renal nutcracker syndrome share the same pathogenesis, concurrent development has rarely been reported. Herein, we report a 23-year-old healthy male diagnosed with SMA syndrome and renal nutcracker syndrome due to severe weight reduction...
November 25, 2017: Korean Journal of Gastroenterology, Taehan Sohwagi Hakhoe Chi
https://www.readbyqxmd.com/read/29161676/hydrophilic-and-positively-charged-polyethylenimine-functionalized-mesoporous-magnetic-clusters-for-highly-efficient-removal-of-pb-ii-and-cr-vi-from-wastewater
#2
Min Young Lee, Ji Hwan Lee, Jae Woo Chung, Seung-Yeop Kwak
We develop mesoporous magnetic clusters (MMCs) functionalized with hydrophilic branched polyethylenimine (b-PEI), later called b-MG, and MMCs functionalized with positively charged b-PEI (p-MG). These materials efficiently remove Pb(II) and Cr(VI) from wastewater. Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, and nitrogen adsorption-desorption analysis results clearly indicate that hydrophilic b-PEI and positively charged b-PEI are successfully attached to the MMC surfaces...
November 18, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29161669/the-coastal-environment-affects-lead-and-sodium-uptake-by-the-moss-hypnum-cupressiforme-used-as-an-air-pollution-biomonitor
#3
Marie Renaudin, Sébastien Leblond, Caroline Meyer, Christophe Rose, Emeline Lequy
Several studies suggest that potential competition exists between marine cations and heavy metals for binding sites on the cell wall of mosses. This competition would impact the heavy metal concentration measured in mosses by biomonitoring programs, which may underestimate air pollution by heavy metals in a coastal environment. In the present study, we aim to identify possible mechanisms affecting lead uptake by mosses in a coastal environment, specifically, the competition between lead (Pb(2+)) and sodium (Na(+)) for binding sites in Hypnum cupressiforme (Hc)...
November 10, 2017: Chemosphere
https://www.readbyqxmd.com/read/29161662/deiodination-of-iopamidol-by-zero-valent-iron-zvi-enhances-formation-of-iodinated-disinfection-by-products-during-chloramination
#4
Huiyu Dong, Zhimin Qiang, Junfeng Lian, Jin Li, Jianwei Yu, Jiuhui Qu
Iodinated X-ray contrast media (ICM) is considered as one of iodine sources for formation of toxic iodinated disinfection byproducts (I-DBPs) during disinfection. This study investigated transformation of a typical ICM, iopamidol (IPM) by zero valent iron (ZVI) and the effect of transformation on the formation of I-DBPs during chloramination. It was found that the presence of ZVI could deiodinate IPM into I(-) and the transformation of IPM exhibited a pseudo-first-order kinetics. Acidic circumstance, SO4(2-), Cl(-) and monochloramine could promote the transformation of IPM by ZVI, while SiO3(2-) inhibited the transformation of IPM...
November 14, 2017: Water Research
https://www.readbyqxmd.com/read/29161647/simple-synthesis-of-self-supported-hierarchical-aupd-alloyed-nanowire-networks-for-boosting-electrocatalytic-activity-toward-formic-acid-oxidation
#5
Tao Yuan, Hong-Yan Chen, Xiaohong Ma, Jiu-Ju Feng, Pei-Xin Yuan, Ai-Jun Wang
Herein, self-supported hierarchical AuPd alloyed interconnected nanowire networks (AuPd NCNs) were fabricated by a one-pot co-reduction method. Theophylline was acted as the capping and structure-directing agents. The product was mainly characterized by a series of techniques such as transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The hierarchical nanostructures had the enlarged electrochemically active surface area (EASA), and the enhanced catalytic activity toward formic acid oxidation reaction (FAOR) and strengthened poisoning tolerance for poisoning CO-like intermediates by cyclic voltammetry and chronoamperometry, which outperformed commercial Pd black catalyst...
November 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29161499/polymerization-of-well-aligned-organic-nanowires-on-a-ferromagnetic-rare-earth-surface-alloy
#6
Mikel Abadía, Maxim Ilyn, Ignacio Piquero-Zulaica, Pierluigi Gargiani, Celia Rogero, Jose Enrique Ortega, Jens Brede
The high reactivity of magnetic substrate toward molecular overlayers has so far inhibited the realization of more sophisticated on-surface reactions thereby depriving these interfaces of a significant class of chemically tailored organics such as graphene nanoribbons, oligonuclear spin-chains, and metal-organic networks. Here, we present a multi-technique characterization of the polymerization of 4,4″-dibromo-p-terphenyl precursors into ordered poly (p-phenylene) arrays on top of the bi-metallic GdAu$_2$ surface alloy...
November 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/29161048/local-chemical-ordering-and-negative-thermal-expansion-in-ptni-alloy-nanoparticles
#7
Qiang Li, He Zhu, Li Rong Zheng, Longlong Fan, Na Wang, Yangchun Rong, Yang Ren, Jun Chen, Jinxia Deng, Xianran Xing
An atomic insight into the local chemical ordering and lattice strain is particular interesting to recent emerging bimetallic nanocatalysts such as PtNi alloys. Here, we reported the atomic distribution, chemical environment and lattice thermal evolution in full-scale structural description of PtNi alloy nanoparticles (NPs). The different segregation of elements in the well-faceted PtNi nanoparticles is convinced by extended X-ray absorption fine structure (EXAFS). Atomic pair distribution function (PDF) study evidences the co-existence of the face-centered cubic and tetragonal ordering parts in the local environment of PtNi nanoparticles...
November 21, 2017: Nano Letters
https://www.readbyqxmd.com/read/29161042/conformational-dynamics-of-matrix-metalloproteinase-1%C3%A2-triple-helical-peptide-complexes
#8
Tatyana G Karabencheva-Christova, Christo Z Christov, Gregg B Fields
Matrix metalloproteinase-1 (MMP-1) is a zinc-dependent protease that catalyzes hydrolysis of interstitial collagens. A previously reported X-ray crystallographic structure revealed specific interactions between a triple-helical peptide (THP) model of interstitial collagen and the hemopexin-like (HPX) and catalytic (CAT) domains of MMP-1. An NMR-based structure of MMP-1 in complex with a different THP was also solved, where docking was used to model the MMP-1•THP interactions and develop a mechanism for the early stages of collagenolysis...
November 21, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29161039/x-ray-emission-spectrum-of-liquid-ethanol-origin-of-split-peaks
#9
Osamu Takahashi, Mathias P Ljungberg, Lars G M Pettersson
The X-ray emission spectrum of liquid ethanol was calculated using density functional theory and a semi-classical approximation to the Kramers-Heisenberg formula including core-hole-induced dynamics. Our spectrum agrees well with the experimental spectrum. We found that the intensity ratio between the two peaks at 526 and 527 eV assigned as 10a' and 3a" depends not only on the hydrogen bonding network around the target molecule, but also on the intramolecular conformation. This effect is absent in liquid methanol and demonstrates the high sensitivity of X-ray emission to molecular structure...
November 21, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29160950/superconductivity-in-a-cu-ii-based-coordination-polymer-with-perfect-kagom%C3%A3-structure
#10
Xing Huang, Shuai Zhang, Liyao Liu, Lei Yu, Genfu Chen, Wei Xu, Daoben Zhu
Highly crystalline material of Copper (II) benzenehexathiolate coordination polymer (Cu-BHT) has been prepared. Its two dimensional kagomè structure has been confirmed by powder x-ray diffraction (PXRD), high-resolution transmission electron microscope (HRTEM) and high-resolution scanning transmission electron microscope (STEM). The as-prepared sample exhibits bulk superconductivity at ~ 0.25 K which is confirmed by the zero resistivity, AC magnetic susceptibility and specific heat measurements. Another diamagnetic transition at ~ 3K suggests that there is a second superconducting phase which may be associated to the single layer or few-layer of Cu-BHT...
November 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29160888/iron-iii-complexes-of-2-methyl-6-pyrimidin-2-yl-hydrazonomethyl-phenol-as-spin-crossover-molecular-materials
#11
Juan Yuan, Mei-Jiao Liu, Cai-Ming Liu, Hui-Zhong Kou
Four new mononuclear Fe(iii) complexes 1-4 of 2-methyl-6-(pyrimidin-2-yl-hydrazonomethyl)-phenol (H2L) have been synthesized and characterized by magnetic susceptibility measurements and single-crystal X-ray diffraction analysis. Complexes 1-3 are ionic compounds with the formula [Fe(HL)2]X·nsolvent (X = ClO4(-) (1), BF4(-) (2) and Cl(-) (3)), while complex 4 ([Fe(HL)(L)]) is neutral. The central Fe(iii) ion in complexes 1-4 is coordinated by four nitrogen and two oxygen atoms of two Schiff base ligands HL(-) or L(2-), and the coordination geometries of Fe(III) are all distorted octahedral...
November 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29160883/correction-synthesis-and-x-ray-structural-characterization-of-the-chlorochalcogeno-phosphonium-cations-r2r-pscl-and-r2r-psecl-as-their-aucl4-salts
#12
Daniel Upmann, Peter G Jones
Correction for 'Synthesis and X-ray structural characterization of the (chlorochalcogeno)phosphonium cations R2R'PSCl(+) and R2R'PSeCl(+) as their AuCl4(-) salts' by Daniel Upmann and Peter G. Jones, Dalton Trans., 2013, 42, 7526-7528.
November 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29160880/low-temperature-growth-of-gallium-oxide-thin-films-via-plasma-enhanced-atomic-layer-deposition
#13
Richard O'Donoghue, Julian Rechmann, Morteza Aghaee, Detlef Rogalla, Hans-Werner Becker, Mariadriana Creatore, Andreas Dirk Wieck, Anjana Devi
Herein we describe an efficient low temperature (60-160 °C) plasma enhanced atomic layer deposition (PEALD) process for gallium oxide (Ga2O3) thin films using hexakis(dimethylamido)digallium [Ga(NMe2)3]2 with oxygen (O2) plasma on Si(100). The use of O2 plasma was found to have a significant improvement on the growth rate and deposition temperature when compared to former Ga2O3 processes. The process yielded the second highest growth rates (1.5 Å per cycle) in terms of Ga2O3 ALD and the lowest temperature to date for the ALD growth of Ga2O3 and typical ALD characteristics were determined...
November 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29160836/an-in-vitro-study-of-the-photodynamic-effectiveness-of-go-ag-nanocomposites-against-human-breast-cancer-cells
#14
Fozia Shaheen, Muhammad Hammad Aziz, Muhammad Fakhar-E-Alam, Muhammad Atif, Mahvish Fatima, Riaz Ahmad, Atif Hanif, Saqib Anwar, Fatima Zafar, Ghazanfar Abbas, Syed Mansoor Ali, Mukhtar Ahmed
Graphene-based materials have garnered significant attention because of their versatile bioapplications and extraordinary properties. Graphene oxide (GO) is an extremely oxidized form of graphene accompanied by the functional groups of oxygen on its surface. GO is an outstanding platform on which to pacify silver nanoparticles (Ag NPs), which gives rise to the graphene oxide-silver nanoparticle (GO-Ag) nanocomposite. In this experimental study, the toxicity of graphene oxide-silver (GO-Ag) nanocomposites was assessed in an in vitro human breast cancer model to optimize the parameters of photodynamic therapy...
November 21, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29160771/synthesis-of-oxide-free-aluminum-nanoparticles-for-application-to-conductive-film
#15
Yung Jong Lee, Changsoo Lee, Hyuck Mo Lee
Aluminum nanoparticles are considered promising as alternatives to conventional ink materials, replacing silver and copper nanoparticles due to their extremely low cost and low melting temperature. However, a serious obstacle to realizing their use as conductive ink materials is the oxidation of aluminum. In this research, we synthesized the oxide-free aluminum nanoparticles using catalytic decomposition and an oleic acid coating method, and these materials were applied to the conductive ink for the first time...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29160703/ruthenium-carbon-rich-group-as-a-redox-switchable-metal-coupling-unit-in-linear-trinuclear-complexes
#16
Emmanuel Di Piazza, Corentin Boilleau, Antoine Vacher, Khalissa Merahi, Lucie Norel, Karine Costuas, Thierry Roisnel, Sylvie Choua, Philippe Turek, Stéphane Rigaut
The preparation and properties of novel ruthenium carbon-rich complexes [(Ph-C≡C-)2-nRu(dppe)2(-C≡C-bipyM(hfac)2)n] (n = 1, 2; M = Cu(II), Mn(II); bipy = 2,2'-bipyridin-5-yl) characterized by single-crystal X-ray diffraction and designed for molecular magnetism are reported. With the help of EPR spectroscopy, we show that the neutral ruthenium system sets up a magnetic coupling between two remote paramagnetic Cu(II) units. More specifically, these copper compounds are unique examples of bimetallic and linear heterotrimetallic compounds for which a complete rationalization of the magnetic interactions could be made for exceptionally long distances between the spin carriers (8...
November 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29160702/heterometallic-heptanuclear-cu5ln2-ln-tb-dy-and-ho-single-molecule-magnets-organized-in-one-dimensional-coordination-polymeric-network
#17
Atanu Dey, Sourav Das, Subrata Kundu, Abhishake Mondal, Mathieu Rouzières, Corine Mathonière, Rodolphe Clérac, Ramakirushnan Suriya Narayanan, Vadapalli Chandrasekhar
The reaction of a multisite coordination ligand, LH3, with Cu(II) salts and Ln(NO3)3·nH2O in a 1:2:1 stoichiometric ratio in the presence of triethylamine was found to afford a series of one-dimensional heterometallic [{Cu5Ln2(L)2(μ3-OH)4(ClO4)(NO3)3(OH2)5}(ClO4)2(H2O)x]∞ [Ln = Tb(1), Dy(2) and Ho(3), x = 4.25, 5.5, and 5 for 1-3, respectively] coordination polymers. Complexes 1-3 have been characterized by single crystal X-ray crystallography. The detailed study of the magnetic properties has also been performed and compared with the parent [Cu5Ln2] molecular analogues...
November 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29160685/graphene-oxide-a-new-carrier-for-slow-release-of-plant-micronutrients
#18
Shervin Kabiri, Fien Degryse, Diana N H Tran, Rodrigo da Silva, Michael J McLaughlin, Dusan Losic
The environmental problems and low efficiency associated with conventional fertilizers provides an impetus to develop advanced fertilizers with slower release and better performances. Here we report of development of a new carrier platform based on graphene oxide (GO) sheets that can provide a high loading of plant micronutrients with controllable slow release. To prove this concept two micronutrients zinc (Zn) and copper (Cu) were used to load on GO sheets and hence formulate GO-based micronutrients fertilizer...
November 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29160625/evaluation-of-two-novel-plant-gums-for-bioadhesive-microsphere-and-sustained-release-formulations-of-metformin-hydrochloride
#19
John Oluwasogo Ayorinde, Michael Ayodele Odeniyi, Arvind K Bansal
BACKGROUND: The biological half life of metformin requires multiple doses which are associated with poor patient compliance. This justifies the need for a dosage form with reduced dosing frequency. OBJECTIVES: Gums from Enterolobium cyclocarpum and Cedrela odorata trees were evaluated in formulating bioadhesive microspheres containing metformin hydrochloride, for sustained drug release. Hydroxylpropylmethyl cellulose (HPMC) was the standard. MATERIAL AND METHODS: Microspheres were produced from formulations of API and either cedrela gum (FC), enterolobium gum (FE) or HPMC (FH), using a W/O solvent extraction technique...
January 2017: Polimery W Medycynie
https://www.readbyqxmd.com/read/29160443/body-fat-redistribution-and-changes-in-lipid-and-glucose-metabolism-in-people-living-with-hiv-aids
#20
Rebeca Antunes Beraldo, André Pereira Dos Santos, Mariana Palma Guimarães, Helena Siqueira Vassimon, Francisco José Albuquerque de Paula, Dalmo Roberto Lopes Machado, Maria Cristina Foss-Freitas, Anderson Marliere Navarro
INTRODUCTION: The HIV lipodystrophy syndrome is characterized by changes in metabolism, and body composition that increase cardiovascular risk of people living with HIV/AIDS (PLWHA) using highly active antiretroviral therapy (HAART). OBJECTIVE: To assess the prevalence of lipodystrophy and changes in lipid and glucose metabolism in PLWHA in use of HAART. METHODS: For the anthropometric evaluation we measured weight, height and abdominal circumference (AC)...
July 2017: Revista Brasileira de Epidemiologia, Brazilian Journal of Epidemiology
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