keyword
MENU ▼
Read by QxMD icon Read
search

crystalization

keyword
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
#1
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/29161671/effective-removal-of-hazardous-trace-metals-from-recovery-boiler-fly-ashes
#2
Teemu Kinnarinen, Mohammad Golmaei, Eeva Jernström, Antti Häkkinen
The objective of this study is to introduce a treatment sequence enabling straightforward and effective recovery of hazardous trace elements from recovery boiler fly ash (RBFA) by a novel method, and to demonstrate the subsequent removal of Cl and K with the existing crystallization technology. The treatment sequence comprises two stages: dissolution of most other RBFA components than the hazardous trace elements in water in Step 1 of the treatment, and crystallization of the process chemicals in Step 2. Solid-liquid separation has an important role in the treatment, due to the need to separate first the small solid residue containing the trace elements, and to separate the valuable crystals, containing Na and S, from the liquid rich in Cl and K...
November 18, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29161620/in-situ-elastic-strain-mapping-during-micromechanical-testing-using-ebsd
#3
Mark J McLean, William A Osborn
Compared to more commonly used strain measurement techniques, electron backscatter diffraction (EBSD) offers improved spatial resolution and measurement sensitivity. Additionally, EBSD can provide the full deformation tensor, whereas other techniques, such as digital image correlation (DIC), are limited to only in-plane strains and rotations. In this work, EBSD was used to measure strains and rotations in-situ during testing of a single-crystal silicon micromechanical test specimen. The theta-like specimen geometry was chosen due to the complex and spatially-varying strain states that exist in the circular frame of the sample during testing, as well as the nominally uniform strains in the central web...
November 14, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/29161509/variation-in-the-supersaturation-and-phase-behavior-of-ezetimibe-amorphous-solid-dispersions-upon-dissolution-in-different-biorelevant-media
#4
Ahmed Elkhabaz, Sreya Sarkar, Janny K Dinh, Garth J Simpson, Lynne S Taylor
The delivery of poorly water-soluble drugs using amorphous solid dispersions (ASDs) has been widely acknowledged as a promising strategy for enhancing oral bioavailability. Upon dissolution, ASDs have accelerated dissolution rates and yield supersaturated solutions leading to higher apparent solubilities. Understanding the complex phase behavior of ASDs during dissolution is crucial for developing an effective formulation. Since the absorption of a lipophilic, high permeability drug is determined primarily by the intraluminal dissolution process and the final concentration achieved, there is a need for evaluation in biorelevant dissolution media that simulate both fasting and fed gastrointestinal states...
November 21, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29161028/exploring-the-active-centre-of-lsd1-corest-complex-by-molecular-dynamics-simulation-utilizing-its-co-crystallized-cofactor-tetrahydrofolate-as-a-probe
#5
Waleed A A Zalloum, Hiba M Zalloum
Epigenetic targeting of cancer is a recent era to manipulate the gene without destroying the genetic material. Lysine-specific demethylase 1 (LSD1) is one of the enzymes associated with the chromatin for post-translational modifications, where it demethylates lysine amino acid in the chromatin H3 tail. Many studies showed that inhibiting LSD1 could potentially be used to treat cancer epigenetically. LSD1 is associated with its corepressor protein CoREST, and uses tetrahydrofolate as a cofactor to accept CH2 from the demethylation process...
November 21, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/29161022/structural-and-functional-studies-of-the-daunorubicin-priming-ketosynthase-dpsc
#6
David R Jackson, Gaurav Shakya, Avinash B Patel, Lina Y Mohammed, Kostas Vasilakis, Pakorn Wattana-Amorn, Timothy R Valentic, Jacob Milligan, Matthew P Crump, John Crosby, Shiou-Chuan Tsai
Daunorubicin is a type II polyketide, one of a large class of polyaromatic natural products with anticancer, antibiotic and antiviral activity. Type II polyketides are formed by the assembly of malonyl-CoA building blocks, though in rare cases, biosynthesis is initiated by the incorporation of a non-malonyl derived starter unit, which adds molecular diversity to the poly-β-ketone backbone. Priming mechanisms for the transfer of novel starter units onto polyketide synthases (PKS) are still poorly understood...
November 21, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/29161011/the-design-of-plasmodium-vivax-hypoxanthine-guanine-phosphoribosyltransferase-inhibitors-as-potential-antimalarial-therapeutics
#7
Dianne T Keough, Dominik Rejman, Radek Pohl, Eva Zborníková, Dana Hockova, Tristan Croll, Michael D Edstein, Geoff W Birrell, Marina Chavchich, Lieve M J Naesens, Gregory K Pierens, Ian M Brereton, Luke W Guddat
Plasmodium falciparum (Pf) and Plasmodium vivax (Pv) are the foremost causative agents of malaria. Due to the development of resistance to current antimalarial medications, new drugs for this parasitic disease need to be discovered. The activity of hypoxanthine-guanine-[xanthine]-phosphoribosyltransferase, HG[X]PRT, is reported to be essential for the growth of both of these parasites, making it an excellent target for antimalarial drug discovery. Here, we have used rational structure-based methods to design an inhibitor, [3R,4R]-4-guanin-9-yl-3-((S)-2-hydroxy-2-phosphonoethyl)oxy-1-N-(phosphonopropionyl)pyrrolidine, of PvHGPRT and PfHGXPRT which has Ki values of 8 nM and 7 nM, respectively for these two enzymes...
November 21, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/29160936/liquid-photonic-crystals-for-mesopore-detection
#8
Biting Zhu, Qianqian Fu, Ke Chen, Jianping Ge
Nitrogen adsorption-desorption for mesopore characterization requires the using of expensive instrument, time-consuming process and consumption of liquid nitrogen. Here, a new method was developed to measure the pore parameters through mixing of mesoporous substance with supersaturated SiO2 colloidal solution at different temperatures, followed by quick measurement of reflection changes of the precipitated liquid photonic crystals. Pore volumes and diameters of mesoporous silica were measured according to the positive correlation between unit mass reflection change (Δλ/m) and pore volume (V), and the negative correlation between average absorption temperature (T) and pore diameter (D)...
November 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29160906/100-fold-enhancement-of-carrier-transport-in-uniaxial-oriented-mesoporous-anatase-tio2-films
#9
Xinjian Feng, Ke Li, Xia Sheng, Liping Chen, Tao Xu, Kai Zhu, Jie Liu
Mesoporous semiconductor films are of considerable interest for applications in photoelectrochemical devices, however, despite intensive research till now, their charge transport properties remain significantly lower than their single-crystal counterparts. Herein, we report a novel low-temperature template-free technique for growing high surface area mesoporous anatase TiO2 films with a preferred [001] crystalline-orientation on FTO-coated glass substrate. Compared to mesoporous films that comprised of randomly oriented crystallites, the uniaxial orientation enables a 100-fold increase in the rate of electron transport...
November 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29160888/iron-iii-complexes-of-2-methyl-6-pyrimidin-2-yl-hydrazonomethyl-phenol-as-spin-crossover-molecular-materials
#10
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/29160880/low-temperature-growth-of-gallium-oxide-thin-films-via-plasma-enhanced-atomic-layer-deposition
#11
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/29160879/molten-bacn2-for-the-sintering-and-crystal-growth-of-dielectric-oxynitride-perovskites-sr1-xbaxtao2n-x-0-04-0-23
#12
Akira Hosono, Yuji Masubuchi, Takashi Endo, Shinichi Kikkawa
Solid phase sintering of dielectric oxynitride perovskites above 1000 °C is accompanied by their decomposition. Post-ammonolysis is required to recover their stoichiometric nitrogen content and dielectric properties. In the present work, the oxynitride perovskite SrTaO2N was sintered with a BaCN2 flux at approximately 900 °C avoiding its thermal decomposition. The resulting solid product with a relative density of 68.9% showed relative dielectric constants in the range from 68 to 90 with loss values less than 0...
November 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29160873/low-oxidation-state-silicon-clusters-synthesis-and-structure-of-nhc-dipp-cu-%C3%AE-4-si9-3
#13
Felix S Geitner, Thomas F Fässler
The reaction of NHC(Dipp)CuCl with the silicide phases A12Si17 (A: K, K/Rb, Rb) in NH3(l) yields [NHC(Dipp)Cu(η(4)-Si9)](3-) (1) as only the third example of a substituted [Si9] cluster. The corresponding salts A3[A(2.2.2-crypt)]3[NHC(Dipp)Cu(η(4)-Si9)]2·26NH3 (A: K (1a), K/Rb (1b), Rb (1c)) crystallize isostructurally in the space group P1[combining macron] and have been characterized by single crystal structure determination. ESI-MS and NMR experiments reveal that the anion [NHC(Dipp)Cu(η(4)-Si9)](3-) can also be transferred to pyridine or acetonitrile solutions at low temperature...
November 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29160872/zinc-ii-cobalt-ii-and-manganese-ii-networks-with-phosphoserine-ligand-synthesis-crystal-structures-and-magnetic-and-proton-conductivity-properties
#14
J Vallejo, I R Salcedo, R M P Colodrero, A Cabeza, A Switlicka, J Cano, M Viciano-Chumillas
A series of zinc(ii), cobalt(ii) and manganese(ii) coordination networks with phosphoserine ligand (H3PSer) are synthesized and characterized. Whereas in compounds 1 and 2 with the general formula [M(HPser)]n [M = Zn (1) and Co (2)], the metal(ii) ion presents a tetrahedral geometry, in [Co(HPSer)(H2O)2]n (3) and [Mn(HPSer)(H2O)]n (4), the metal(ii) ions are in a distorted octahedral geometry. The 3D frameworks are formed by inorganic layers built up from MO4 or MO6 polyhedra and phosphate groups. These layers are linked by the carboxylate groups of the phosphoserine ligand...
November 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29160851/development-of-an-impedimetric-aptasensor-for-the-detection-of-staphylococcus-aureus
#15
Peggy Reich, Regina Stoltenburg, Beate Strehlitz, Dieter Frense, Dieter Beckmann
In combination with electrochemical impedance spectroscopy, aptamer-based biosensors are a powerful tool for fast analytical devices. Herein, we present an impedimetric aptasensor for the detection of the human pathogen Staphylococcus aureus. The used aptamer targets protein A, a surface bound virulence factor of S. aureus. The thiol-modified protein A-binding aptamer was co-immobilized with 6-mercapto-1-hexanol onto gold electrodes by self-assembly. Optimization of the ratio of aptamer to 6-mercapto-1-hexanol resulted in an average density of 1...
November 21, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29160774/etchant-free-transfer-of-2d-nanostructures
#16
Fu Zhang, Chad Erb, Lauren Runkle, Xiaotian Zhang, Nasim Alem
The effective use of the van der Waals 2D materials relies on their successful transfer from the growth substrate onto other target substrates in the form of large films or flakes. In particular, it is important to transfer such atomically thin samples to various substrates with minimal sample damage and exposure to etchants and chemicals to realize their applications. Here we develop a universal transfer method that not only is free of reactive etchants, but also can maintain the film morphology intact with no tears and cracks...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29160772/crystal-identification-for-a-dual-layer-offset-lyso-based-pet-system-via-lu-176-background-radiation-and-mean-shift-algorithm
#17
Qingyang Wei, Tianyu Ma, Tianpeng Xu, Ming Zeng, Yu Gu, Tiantian Dai, Yaqiang Liu
Modern positron emission tomography (PET) detectors are made from pixelated scintillation crystal arrays and readout by Anger logic. The interaction position of the gamma-ray should be assigned to a crystal using a crystal position map or look-up table. Crystal identification is a critical procedure for pixelated PET systems. In this paper, we propose a novel crystal identification method for a dual-layer-offset LYSO based animal PET system via Lu-176 background radiation and mean shift algorithm. Single photon event data of the Lu-176 background radiation are acquired in list-mode for 3 hours to generate a single photon flood map (SPFM)...
November 21, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29160770/cascaded-longitudinal-stimulated-raman-scattering-and-frequency-doubling-process-of-potassium-dihydrogen-phosphate-crystal
#18
Zhixin Wu, Zhengping Wang, Hongkai Ren, Hongwei Qi, Lisong Zhang, Ying Zhou, Qingtian Gu, Xun Sun, Dawei Hu, Xinguang Xu
The cascaded longitudinal stimulated Raman scattering (LSRS) and frequency doubling process was reported for the first time. When potassium dihydrogen phosphate (KDP) crystals were used as the type-I and type-II frequency doublers of picosecond, focused, 1064 nm laser pulses, strong LSRS effects were observed. Three new laser spectrum lines appeared successively, i.e. 558.9, 588.9, and 622.1 nm, which turned out to be excited by frequency doubling laser at 532 nm. The second and third-order nonlinear optical frequency conversions were achieved in a single KDP crystal...
November 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29160703/ruthenium-carbon-rich-group-as-a-redox-switchable-metal-coupling-unit-in-linear-trinuclear-complexes
#19
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
#20
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
keyword
keyword
98975
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"