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https://www.readbyqxmd.com/read/27925753/three-dimensional-variable-wavelength-x-ray-bragg-coherent-diffraction-imaging
#1
W Cha, A Ulvestad, M Allain, V Chamard, R Harder, S J Leake, J Maser, P H Fuoss, S O Hruszkewycz
We present and demonstrate a formalism by which three-dimensional (3D) Bragg x-ray coherent diffraction imaging (BCDI) can be implemented without moving the sample by scanning the energy of the incident x-ray beam. This capability is made possible by introducing a 3D Fourier transform that accounts for x-ray wavelength variability. We demonstrate the approach by inverting coherent Bragg diffraction patterns from a gold nanocrystal measured with an x-ray energy scan. Variable-wavelength BCDI will expand the breadth of feasible in situ 3D strain imaging experiments towards more diverse materials environments, especially where sample manipulation is difficult...
November 25, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27925311/the-chemistry-of-a-non-interacting-vicinal-frustrated-phosphane-borane-lewis-pair
#2
Lisa-Maria Elmer, Gerald Kehr, Constantin G Daniliuc, Melanie Siedow, Hellmut Eckert, Matthias Tesch, Armido Studer, Kamille Williams, Timothy H Warren, Gerhard Erker
The dimesitylphosphinocyclopentene/HB(C6 F5 )2 -derived vicinal trans-1,2-P/B frustrated Lewis pair (FLP) 4 shows no direct phosphane-borane interaction. Toward some reagents it behaves similar to an intermolecular FLP; it cleaves dihydrogen, deprotonates terminal alkynes, and adds to organic carbonyl compounds including CO2 . It shows typical intramolecular FLP reaction modes (cooperative 1,1-additions) to mesityl azide, to carbon monoxide, and to NO. The latter reaction yields a persistent P/B FLPNO nitroxide radical, which undergoes H-atom abstraction reactions...
December 7, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27924843/exploring-the-coordination-change-of-vanadium-and-structure-transformation-of-metavanadate-mgv2o6-under-high-pressure
#3
Ruilian Tang, Yan Li, Shengyi Xie, Nana Li, Jiuhua Chen, Chunxiao Gao, Pinwen Zhu, Xin Wang
Raman spectroscopy, synchrotron angle-dispersive X-ray diffraction (ADXRD), first-principles calculations, and electrical resistivity measurements were carried out under high pressure to investigate the structural stability and electrical transport properties of metavanadate MgV2O6. The results have revealed the coordination change of vanadium ions (from 5+1 to 6) at around 4 GPa. In addition, a pressure-induced structure transformation from the C2/m phase to the C2 phase in MgV2O6 was detected above 20 GPa, and both phases coexisted up to the highest pressure...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27924296/data-in-support-of-covalent-attachment-of-tyrosinase-onto-cyanuric-chloride-crosslinked-magnetic-nanoparticles
#4
Kourosh Abdollahi, Farshad Yazdani, Reza Panahi
Preparation and characterization of cross linked amine-functionalized magnetic nanoparticles as an appropriate support for covalent immobilization on tyrosinase was presented in the study "Covalent immobilization of tyrosinase onto cyanuric chloride crosslinked amine-functionalized superparamagnetic nanoparticles: synthesis and characterization of the recyclable nanobiocatalyst" (Abdollahi et al., 2016 ) [1]. Herein, complementary data regarding X-ray powder diffraction (XRD) to characterize the synthesized magnetic nanoparticles, and transmission electron microscopy (TEM) to determine the size and morphology of tyrosinase immobilized magnetic nanoparticles (tyrosinase-MNPs) were reported...
December 2016: Data in Brief
https://www.readbyqxmd.com/read/27923503/selection-of-active-phase-of-mno2-for-catalytic-ozonation-of-4-nitrophenol
#5
Faheem Nawaz, Hongbin Cao, Yongbing Xie, Jiadong Xiao, Yue Chen, Zahid Ali Ghazi
Catalytic ozonation is a highly effective method in wastewater treatment, and MnO2 materials are widely recognized as active heterogeneous catalysts in this process. Many works reported the progress in active MnO2 synthesis, but the active phase is rarely systematically studied. In this paper, all six phases of MnO2 (α-, β-, δ-, γ-, λ- and ε-) were synthesized by facile methods. Their catalytic activities in ozonation of 4-nitrophenol (4-NP) were evaluated and correlated with the physicochemical properties obtained from X-ray Diffraction (XRD), transmission electron microscopy (TEM), physical adsorption and cyclic voltammetry (CV) analysis...
December 3, 2016: Chemosphere
https://www.readbyqxmd.com/read/27923141/development-and-characterization-of-electrosprayed-alyssum-homolocarpum-seed-gum-nanoparticles-for-encapsulation-of-d-limonene
#6
Khadije Khoshakhlagh, Arash Koocheki, Mohebbat Mohebbi, Alireza Allafchian
In this study, the feasibility of developing Alyssum homolocarpum seed gum (AHSG) nanocapsules containing d-limonene by electrospraying has been investigated. d-limonene emulsions with constant AHSG (0.5% w/w) and various flavor concentrations (10-30% based on gum weight) with 0.1% Tween 20 were electrosprayed at 20kV and 0.1ml/h of flow rate. The effects of key parameters of emulsions (rheological properties, droplet size, surface tension and electrical conductivity) on the morphology of structures have been studied...
November 21, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27923140/h2s-adsorption-onto-cu-zn-ni-nanoparticles-loaded-activated-carbon-and-ni-co-nanoparticles-loaded-%C3%AE-al2o3-optimization-and-adsorption-isotherms
#7
A Daneshyar, M Ghaedi, M M Sabzehmeidani, A Daneshyar
The nanocomposites based on copper, zinc and nickel were loaded on activated carbon (Cu-Zn-Ni-NPs-AC) and cobalt and nickel nanoparticles was loaded on γ-alumina (Ni-Co-NPs-γAl2O3) and applied for removal of hydrogen sulfide (H2S) from natural gas and their efficiency were compared. Cu-Zn-Ni/AC and Ni-Co/γ-Al2O3 was characterized using different techniques such as energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The effects of variables such as amount of adsorbent, flow rate, temperature, pressure and volume of gas on H2S removal were examined and optimum values were found to be 0...
November 21, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27922106/in-situ-one-step-synthesis-of-carbon-encapsulated-naked-magnetic-metal-nanoparticles-conducted-without-additional-reductants-and-agents
#8
Jun Kang, Yeonwon Kim, Hye-Min Kim, Xiulan Hu, Nagahiro Saito, Jae-Hyuk Choi, Myeong-Hoon Lee
C-encapsulated highly pure Ni, Co, and Fe magnetic nanoparticles (MNPs/C) were synthesized by an innovative one-step in-situ plasma in liquid method (solution plasma processing, SPP) without any additional reductants, agents, or treatment. Successful encapsulation of MNPs was demonstrated by using inductively coupled plasma-atomic emission spectrometry and cyclic voltammetry techniques. The obtained X-ray diffraction patterns and transmission electron microscopy images corresponded to MNPs with average diameters of 5 nm and good crystalline structure...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27921335/reduction-of-cp-sb-4-with-subvalent-main-group-metal-reductants-syntheses-and-structures-of-l1mg-4-sb4-and-l2ga-2-sb4-containing-edge-missing-sb4-units
#9
Stephan Schulz, Chelladurai Ganesamoorthy, Julia Krüger, Christoph Wölper, Anton S Nizovtsev
[Cp*Sb]4 (Cp* = C5Me5) reacts with [L1Mg]2 and L2Ga with for-mation of [(L1Mg)4(4,1:2:2:2-Sb4)] {L1 = i-Pr2NC[N(2,6-i-Pr2C6H3)]2, 1} and [(L2Ga)2(,2:2-Sb4)] {L2 = HC[C(Me)N(2,6-i-Pr2C6H3)]2, 2}. The cleavage of the Sb-Sb and Sb-C bonds in [Cp*Sb]4 are the crucial steps in both reactions. The formation of 1 occurred via elimination of the Cp* anion and formation of Cp*MgL1, while 2 was formed by reductive elimination of Cp*2 and oxidative addition of L2Ga to the Sb4 unit. 1 and 2 were characterized by heteronuclear NMR spectroscopy and single crystal X-ray diffraction and their bonding situation was studied by quantum chemical calculations...
December 6, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27920947/the-daniel-k-inouye-college-of-pharmacy-scripts-poha-berry-physalis-peruviana-with-potential-anti-inflammatory-and-cancer-prevention-activities
#10
Leng Chee Chang, Mayuramas Sang-Ngern, John M Pezzuto, Carolyn Ma
The Daniel K. Inouye College of Pharmacy, during a historic event in Spring 2016, graduated the first two students in the Pacific region to earn a PhD in pharmaceutical sciences at the University of Hawai'i at Hilo. The college offers PhD programs in these five disciplines: Cancer Biology, Medicinal Chemistry, Pharmaceutics, Pharmacognosy, and Pharmacology. One of the Pharmacognosy dissertations focused on plant-derived natural products with potential anti-inflammatory and cancer chemopreventive activities...
November 2016: Hawai'i Journal of Medicine & Public Health: a Journal of Asia Pacific Medicine & Public Health
https://www.readbyqxmd.com/read/27920931/crystal-structures-of-n-4-phenyl-thia-zol-2-yl-carbamo-thio-yl-benzamide-and-n-4-4-bromo-phen-yl-thia-zol-2-yl-carbamo-thio-yl-benzamide-from-synchrotron-x-ray-diffraction
#11
Ekaterina S Gantimurova, Alexander S Bunev, Kristina Yu Talina, Gennady I Ostapenko, Pavel V Dorovatovskii, Nikolai N Lobanov, Victor N Khrustalev
The title compounds, C17H13N3OS2, (I), and C17H12BrN3OS2, (II), are potential active pharmaceutical ingredients. Compound (I) comprises two almost planar fragments. The first is the central (carbamo-thio-yl)amide (r.m.s. deviation = 0.038 Å), and the second consists of the thia-zole and two phenyl rings (r.m.s. deviation = 0.053 Å). The dihedral angle between these planes is 15.17 (5)°. Unlike (I), compound (II) comprises three almost planar fragments. The first is the central N-(thia-zol-2-ylcarbamo-thio-yl)amide (r...
September 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/27920923/mer-tri-chlorido-tris-tetra-hydro-thio-phene-%C3%AE%C2%BAs-iridium-iii-preparation-and-comparison-with-other-mer-tri-chlorido-tris-tetra-hydro-thio-phene-%C3%AE%C2%BAs-metal-complexes
#12
Loren C Brown, Christine M DuChane, Joseph S Merola
The title complex, [IrCl3(C4H8S)3], was prepared according to a literature method. A suitable crystal was obtained by diffusion of pentane into a di-chloro-methane solution and analyzed by single-crystal X-ray diffraction at 100 K. The title complex is isotypic with mer-tri-chlorido-tris-(tetra-hydro-thio-phene-κS)rhodium(III). However, the orientation of the tetra-hydro-thio-phene rings is different from an earlier report of mer-tri-chlorido-tris-(tetra-hydro-thio-phene-κS)iridium(III) deposited in the Cambridge Structural Database...
September 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/27920917/redetermination-of-metarossite-cav-5-2o6%C3%A2-2h2o
#13
Anaïs Kobsch, Robert T Downs, Kenneth J Domanik
The crystal structure of metarossite, ideally CaV2O6·2H2O [chemical name: calcium divanadium(V) hexa-oxide dihydrate], was first determined using precession photographs, with fixed isotropic displacement parameters and without locating the positions of the H atoms, leading to a reliability factor R = 0.11 [Kelsey & Barnes (1960 ▸). Can. Mineral.6, 448-466]. This communication reports a structure redetermination of this mineral on the basis of single-crystal X-ray diffraction data of a natural sample from the Blue Cap mine, San Juan County, Utah, USA (R1 = 0...
September 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/27920896/assessing-the-hyperthermic-properties-of-magnetic-heterostructures-the-case-of-gold-iron-oxide-composites
#14
Elvira Fantechi, Paula M Castillo, Erika Conca, Francesca Cugia, Claudio Sangregorio, Maria Francesca Casula
Gold-iron oxide composites were obtained by in situ reduction of an Au(III) precursor by an organic reductant (either potassium citrate or tiopronin) in a dispersion of preformed iron oxide ultrasmall magnetic (USM) nanoparticles. X-ray diffraction, transmission electron microscopy, chemical analysis and mid-infrared spectroscopy show the successful deposition of gold domains on the preformed magnetic nanoparticles, and the occurrence of either citrate or tiopronin as surface coating. The potential of the USM@Au nanoheterostructures as heat mediators for therapy through magnetic fluid hyperthermia was determined by calorimetric measurements under sample irradiation by an alternating magnetic field with intensity and frequency within the safe values for biomedical use...
December 6, 2016: Interface Focus
https://www.readbyqxmd.com/read/27920890/mesoporous-silica-nanoparticles-equipped-with-surface-nanovalves-for-ph-controlled-liberation-of-doxorubicin
#15
N V Roik, L A Belyakova
Silica carriers equipped with molecular and supramolecular pH-sensitive nanovalves were designed by combination of sol-gel synthesis and selective postsynthetic modification. Mesoporous structure of synthesized materials was characterized by low-temperature nitrogen adsorption-desorption, small-angle X-ray diffraction and transmission electron microscopy. Chemical immobilization of N-[N'-(N'-phenyl)-2-aminophenyl]aminoalkyl groups was confirmed by IR spectral and chemical analyses of surface layer. Loading and release behaviour of synthesized drug carriers was studied in phosphate buffer solutions with pH 5...
December 6, 2016: Interface Focus
https://www.readbyqxmd.com/read/27920884/novel-combinations-of-synthesized-zno-nps-and-ceftazidime-evaluation-of-their-activity-against-standards-and-new-clinically-isolated-pseudomonas-aeruginosa
#16
Elham Isaei, Shahla Mansouri, Fereshteh Mohammadi, Sadegh Taheritarigh, Zohreh Mohammadi
BACKGROUND: Antibiotic resistant bacteria can be considered as a main problem in infection management. Zinc oxide nanoparticles (ZnO NPs), individually or in combination with antibiotics, can be considered as good candidates for struggling against drug resistant bacteria. METHODS: In this study, Zinc oxide nanoparticles were synthesized using sol-gel method in low temperature as a cost effective procedure and characterized by X-ray diffraction and Scanning Electron Microscopy...
October 2016: Avicenna Journal of Medical Biotechnology
https://www.readbyqxmd.com/read/27920499/smart-nanocrystals-of-artemether-fabrication-characterization-and-comparative-in-vitro-and-in-vivo-antimalarial-evaluation
#17
Syed Muhammad Hassan Shah, Farhat Ullah, Shahzeb Khan, Syed Muhammad Mukarram Shah, Marcel de Matas, Zahid Hussain, Muhammad Usman Minhas, Naser M AbdEl-Salam, Khaled Hafez Assi, Mohammad Isreb
Artemether (ARTM) is a very effective antimalarial drug with poor solubility and consequently low bioavailability. Smart nanocrystals of ARTM with particle size of 161±1.5 nm and polydispersity index of 0.172±0.01 were produced in <1 hour using a wet milling technology, Dena(®) DM-100. The crystallinity of the processed ARTM was confirmed using differential scanning calorimetry and powder X-ray diffraction. The saturation solubility of the ARTM nanocrystals was substantially increased to 900 µg/mL compared to the raw ARTM in water (145...
2016: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/27919814/basil-seed-mucilage-as-a-new-source-for-electrospinning-production-and-physicochemical-characterization
#18
Forouzan Kurd, Milad Fathi, Hajar Shekarchizadeh
In this study nanofibers were prepared via the electrospinning technique by basil seed mucilage (BSM) as a new source of hydrocolloid. Polyvinyl alcohol (PVA) was used as an aiding agent. Viscosity and electrical conductivity of BSM/PVA solutions of different volume ratios (100:0, 80:20, 60:40, 40:60, 20:80 and 0:100) were in the range of 790-1300cP and 745-2140μS/cm, respectively. Morphology of nanofibers were investigated using scanning electron microscopy (SEM) that showed an average diameter range of 179-390nm...
December 2, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27919702/design-of-pvp-va-s-630-based-tadalafil-solid-dispersion-to-enhance-the-dissolution-rate
#19
Jin-Seok Choi, Jeong-Sook Park
Tadalafil (TDF) is a Biopharmaceutics Classification System (BCS) class II drug; the efficacy thereof is critically limited by inherent poor water solubility. Solid dispersion (SD) techniques are widely used to improve the bioavailability of drugs that are poorly water-soluble. Herein, we used an SD technique to improve the solubility and in vitro dissolution rate of TDF; a solvent evaporation method was applied involving the use of hydrophilic carriers (PVP/VA S-630) and assistants (malic acid or meglumine)...
December 2, 2016: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/27919625/an-insight-study-on-hptlc-fingerprinting-of-mukia-maderaspatana-mechanism-of-bioactive-constituents-in-metal-nanoparticle-synthesis-and-its-activity-against-human-pathogens
#20
G Karthiga Devi, K Sathish Kumar, R Parthiban, K Kalishwarlal
The present work reports the development of a Simple, rapid and eco-friendly route for the biosynthesis of gold and silver nanoparticles and their antimicrobial activity against gram positive and gram negative bacterial pathogens in the wound infected area. The synthesis was done using Mukia maderasapatna plant extract as a reducing agent. FT-IR analysis reported that the methanol extract was found to contain maximum number of functional groups which is responsible for the reduction of metal ions to metal nanoparticles...
December 2, 2016: Microbial Pathogenesis
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