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https://www.readbyqxmd.com/read/27911481/photoluminescence-and-thermoluminescence-of-k2-mg-so4-2-eu-and-evaluation-of-its-kinetic-parameters
#1
Archana Deshpande, N S Dhoble, S C Gedam, S J Dhoble
The K2 Mg(SO4 )2 :Eu phosphor, synthesized by a solid-state diffusion method, was studied for its photoluminescence (PL) and thermoluminescence (TL) characteristics. The X-ray diffraction (XRD) pattern of the material was matched with the standard JCPDF No. 36-1499. For PL characteristics, K2 Mg(SO4 )2 :Eu(2)(+) showed an emission peak at 474 nm when excited at 340 nm, while it showed Eu(3)(+) emission at 580 nm, and 594 nm splitting at 613 nm and 618 nm for an excitation of 396 nm wavelength due to radiative transitions from (5) D0 to (7) Fj (j = 0, 1, 2, 3)...
December 2, 2016: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/27911474/is-chelation-therapy-efficient-for-the-treatment-of-intravenous-metallic-mercury-intoxication
#2
Daniela Pelclova, Stepanka Vlckova, Ondrej Bezdicek, Manuela Vaneckova, Pavel Urban, Petr Ridzon, Pavel Diblik, Tomas Navratil, Pavlina Klusackova, Kamil Vlcek, Olga Benesova, Pavel Trestik, Jiri Homolka, Sergey Zakharov
The efficacy of treatment for intravenous elemental mercury intoxication has not been fully studied with regard to clinical outcomes, and treatment recommendations vary. We treated a 41-year-old man with a history of drug abuse and depression who attempted suicide using 1 mL (13.53 g) metallic Hg i.v. He was admitted to the hospital two months later for dyspnoea and thoracic pain and was diagnosed with pneumonia. Hg deposits were seen in the lungs and extra-pulmonary organs. His blood level (372 μg/L) exceeded the population level of 5 μg/L by more than 70-fold...
December 2, 2016: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/27911418/synthesis-and-characterization-of-fe-doped-aluminosilicate-nanotubes-with-enhanced-electron-conductive-properties
#3
Ehsan Shafia, Serena Esposito, Elnaz Bahadori, Marco Armandi, Maela Manzoli, Barbara Bonelli
The goal of the protocol is to synthesize Fe-doped aluminosilicate nanotubes of the imogolite type with the formula (OH)3Al2-xFexO3SiOH. Doping with Fe aims at lowering the band gap of imogolite, an insulator with the chemical formula (OH)3Al2O3SiOH, and at modifying its adsorption properties towards azo-dyes, an important class of organic pollutants of both wastewater and groundwater. Fe-doped nanotubes are obtained in two ways: by direct synthesis, where FeCl3 is added to an aqueous mixture of the Si and Al precursors, and by post-synthesis loading, where preformed nanotubes are put in contact with a FeCl3•6H2O aqueous solution...
November 15, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27911354/a-spectral-interior-ct-by-a-framelet-based-reconstruction-algorithm
#4
Yingmei Wang, Ge Wang, Shuwei Mao, Wenxiang Cong, Zhilong Ji, Jian-Feng Cai, Yangbo Ye
Reducing radiation dose is an important goal in medical computed tomography (CT), for which interior tomography is an effective approach. There have been interior reconstruction algorithms for monochromatic CT, but in reality, X-ray sources are polychromatic. Using a polychromatic acquisition model and motivated by framelet-based image processing algorithms, in this paper, we propose an interior reconstruction algorithm to obtain an image with spectral information assuming only one scan with a current energy-integrating detector...
November 22, 2016: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/27911352/medical-equipment-antiseptic-processes-using-the-atmospheric-plasma-sprayed-copper-coatings
#5
M Goudarzi, Sh Saviz, M Ghoranneviss, A Salar Elahi
Antibacterial surfaces such as copper coatings are able to reduce the growth of bacteria. In this study, copper coatings was deposited on the 316 stainless steel substrates by a handmade device operating as an atmospheric plasma spraying system. The chemical composition microstructure and morphology surface of the coatings are examined by x-ray diffraction (XRD) and scanning electron microscope (SEM) and back scattering electron microscope (BSE). Micro hardness as one of the key properties of the coating is characterized based on cross-section...
November 30, 2016: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/27911351/evaluation-of-differential-phase-contrast-cone-beam-ct-imaging-system
#6
Jiangkun Liu, Weixing Cai, Ruola Ning
Grating-based differential phase contrast (DPC) imaging enables the use of a hospital-grade X-ray tube, but compromises the image quality due to insufficiently coherent illumination. In this research, a bench-top DPC cone beam CT (DPC-CBCT) was systematically evaluated and compared with the traditional attenuation-based CBCT in terms of contrast to noise ratio, noise property, and contrast resolution through phantom studies. In order to evaluate DPC-CBCT for soft tissue imaging, breast specimen and small animal studies were carried out...
November 30, 2016: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/27911050/tuning-the-reactivity-of-graphene-by-surface-phase-orientation
#7
Jan Plsek, Petr Kovaricek, Vaclav Vales, Martin Kalbac
Tuning the local reactivity of graphene is a subject of paramount importance. Among the available strategies, the activation/passivation of graphene by copper substrate is very promising, because it enables to influence the properties of graphene without any transfer procedure as graphene can be grown directly on copper. Here, we demonstrate that the reactivity of graphene towards fluorination is strongly influenced by the face of the surface of the copper substrate. We probed graphene on the copper foil with identified grain orientations...
December 2, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27911011/fragment-based-design-synthesis-and-biological-evaluation-of-1-substituted-indole-2-carboxylic-acids-as-selective-mcl-1-inhibitors
#8
Ziqian Wang, Wenjie Xu, Ting Song, Zongwei Guo, Lu Liu, Yudan Fan, Anhui Wang, Zhichao Zhang
Based on a known selective Mcl-1 inhibitor, 6-chloro-3-(3-(4-chloro-3,5-dimethylphenoxy)propyl)-1H-indole-2-carboxylic acid, we applied a fragment-based approach to obtain new molecules that extended into the p1 pocket of the BH3 groove and then exhibited binding selectivity for the Mcl-1 over the Bcl-2 protein. After we deconstructed the 1H-indole-2-carboxylic acid from the parental molecule, a benzenesulfonyl was substituted at the 1-position to adopt a geometry preferred for accessing the p1 pocket according to the binding mode of the parental molecule identified by X-ray crystallography...
December 2, 2016: Archiv der Pharmazie
https://www.readbyqxmd.com/read/27910993/synthesis-and-full-characterization-of-an-iridium-b-h-activation-intermediate-of-the-monocarba-closo-dodecaborate-anion
#9
Yunjun Shen, Yani Pan, Jiyong Liu, Tosaporn Sattasathuchana, Kim K Baldridge, Simon Duttwyler
The preparation and full characterization of an iridium complex of the monocarba-closo-dodecaborate anion is reported. It was prepared by B-H bond activation using a tosyl amide directing group. Analysis by spectroscopic methods and X-ray crystallography revealed the presence a direct B-Ir interaction. The carborane acts as a B,N chelating ligand towards the Ir(Cp*)(solvent) fragment, resulting in a monomeric complex that is inert in solution and the solid state. Treatment with N-chlorosuccinimide resulted in selective monochlorination of the B-Ir position...
December 2, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27910841/incommensurate-density-modulation-in-a-na-rich-plagioclase-feldspar-z-contrast-imaging-and-single-crystal-x-ray-diffraction-study
#10
Huifang Xu, Shiyun Jin, Bruce C Noll
Plagioclase feldspars are the most abundant mineral in the Earth's crust. Intermediate plagioclase feldspars commonly display incommensurately modulated or aperiodic structures. Z-contrast images show both Ca-Na ordering and density modulation. The local structure of lamellae domains has I1-like symmetry. The neighboring lamellae domains are in an inversion twinning relationship. With a state-of-the-art X-ray diffraction unit, second-order satellite reflections (f-reflections) are observed for the first time in andesine (An45), a Na-rich e-plagioclase...
December 1, 2016: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
https://www.readbyqxmd.com/read/27910838/hydrogen-substituted-%C3%AE-tricalcium-phosphate-synthesized-in-organic-media
#11
Christoph Stähli, Jürg Thüring, Laëtitia Galea, Solène Tadier, Marc Bohner, Nicola Döbelin
β-Tricalcium phosphate (β-TCP) platelets synthesized in ethylene glycol offer interesting geometries for nano-structured composite bone substitutes but were never crystallographically analyzed. In this study, powder X-ray diffraction and Rietveld refinement revealed a discrepancy between the platelet structure and the known β-TCP crystal model. In contrast, a model featuring partial H for Ca substitution and the inversion of P1O4 tetrahedra, adopted from the whitlockite structure, allowed for a refinement with minimal misfits and was corroborated by HPO4(2-) absorptions in Fourier-transform IR spectra...
December 1, 2016: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
https://www.readbyqxmd.com/read/27910836/neutron-and-high-pressure-x-ray-diffraction-study-of-hydrogen-bonded-ferroelectric-rubidium-hydrogen-sulfate
#12
Jack Binns, Garry J McIntyre, Simon Parsons
The pressure- and temperature-dependent phase transitions in the ferroelectric material rubidium hydrogen sulfate (RbHSO4) are investigated by a combination of neutron Laue diffraction and high-pressure X-ray diffraction. The observation of disordered O-atom positions in the hydrogen sulfate anions is in agreement with previous spectroscopic measurements in the literature. Contrary to the mechanism observed in other hydrogen-bonded ferroelectric materials, H-atom positions are well defined and ordered in the paraelectric phase...
December 1, 2016: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
https://www.readbyqxmd.com/read/27910835/two-cubic-phases-in-kimzeyite-garnet-from-the-type-locality-magnet-cove-arkansas
#13
Sytle M Antao, Laura A Cruickshank
The crystal structure of an optically anisotropic kimzeyite garnet from Magnet Cove, Arkansas, USA, where it was first discovered, was refined with the Rietveld method, cubic space group, Ia\overline 3 d, and monochromatic [λ = 0.41422 (2) Å] synchrotron high-resolution powder X-ray diffraction (HRPXRD) data. The Rietveld refinement reduced χ(2) and overall R(F(2)) values are 1.840 and 0.0647, respectively. The sample, with the general garnet formula ([8])X3([6])Y2([4])Z3([4])O12, contains an intergrowth of two cubic phases that occur initially as oscillatory growth zoning, and patchy intergrowths arise later from fluid-enhanced dissolution and re-precipitation...
December 1, 2016: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
https://www.readbyqxmd.com/read/27910834/solvates-of-selected-fenamic-acids-with-substituted-pyridines-structure-thermal-stability-and-desolvation
#14
Jacky S Bouanga Boudiombo, Ayesha Jacobs
Mefenamic acid (MA) formed solvates with 2-picoline (2PIC), 3-picoline (3PIC), 4-picoline (4PIC) and 3-chloropyridine (3CLPYR). The solvates crystallized in the space group P\bar 1 with the carboxylic acid of MA hydrogen-bonded to the nitrogen of the substituted pyridine. Tolfenamic acid (TFA) formed solvates with 2PIC and 3PIC, the crystal structures successfully solved in the space groups P21/n and Pbca, respectively. The fenamate conformation varied depending on the acid and the included solvent. Similarities were observed in the structures involving MA...
December 1, 2016: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
https://www.readbyqxmd.com/read/27910833/cu-ii-and-zn-ii-%C3%AE-diketonate-coordination-polymers-based-on-pyrimidin-2-amine-pyrazine-and-1-2-bis-4-pyridyl-ethane
#15
Franc Perdih
Copper(II) and zinc(II) bis(4,4,4-trifluoro-1-phenylbutane-1,3-dionato) compounds with pyrimidin-2-amine (pyr2a), pyrazine (pyz) and 1,2-bis(4-pyridyl)ethane (dpet) were prepared and solid-state structures of coordination polymers [M(tfpb)2(pyr2a)]∞ [M = Cu (1), Zn (2); tfpb = 4,4,4-trifluoro-1-phenylbutane-1,3-dionate], [M(tfpb)2(pyz)]∞ [M = Cu (3), Zn (4a, 4b)] and [Cu(tfpb)2(dpet)]∞ (5), respectively, were determined by single-crystal X-ray analysis. The coordination of metal centers in all compounds is octahedral with nitrogen ligands occupying the axial positions...
December 1, 2016: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
https://www.readbyqxmd.com/read/27910832/vacancy-pairing-and-superstructure-in-the-high-pressure-silicate-k1-5mg2si2o7h0-5-a-new-potential-host-for-potassium-in-the-deep-earth
#16
M D Welch, L Bindi, V Petříček, J Plášil
The high-pressure silicate K1.5Mg2Si2O7H0.5, synthesized and characterized by Welch et al. [(2012), Am. Mineral. 97, 1849-1857], has been re-examined with the aim of determining the nature of the superstructure noted in their study. The composition corresponds to a 1:1 combination of KMg2Si2O7H and K2Mg2Si2O7 end-members, but it is not a solid solution. Single-crystal X-ray diffraction data for one of the original K1.5Mg2Si2O7H0.5 crystals synthesized at 16 GPa/1573 K, has been collected using a much longer exposure time in order to improve the intensity statistics of weak superlattice reflections identified by Welch et al...
December 1, 2016: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
https://www.readbyqxmd.com/read/27910825/monte-carlo-studies-on-water-and-lif-cavity-properties-for-dose-reporting-quantities-when-using-x-ray-and-brachytherapy-sources
#17
Isabela Soares Lopes Branco, Paula Cristina Guimarães Antunes, Gabriel Paiva Fonseca, Hélio Yoriyaz
Model-based dose calculation algorithms (MBDCAs) are the current tools to estimate dose in brachytherapy, which takes into account heterogeneous medium, therefore, departing from water-based formalism (TG-43). One aspect associated to MBCDA is the choice of dose specification medium since it offers two possibilities to report dose: (a) dose to medium in medium, D m,m; and (b) dose to water in medium, D w,m. The discussion about the preferable quantity to be reported is underway. The dose conversion factors, DCF, between dose to water in medium, D w,m, and dose to medium in medium, D m,m, is based on cavity theory and can be obtained using different approaches...
December 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27910818/histomorphometric-and-transcriptome-evaluation-of-early-healing-bone-treated-with-a-novel-human-particulate-dentin-powder
#18
Yu-Chih Huang, Wei-Zhen Lew, Sheng-Wei Feng, Wei-Yi Lai, Yoshimitsu Abiko, Haw-Ming Huang
Human particulate dentin (HPD) shows potential as an alternative bone grafting material. However, the mechanism of bone healing at the molecular level after grafting with HPD is unclear. This study assessed the histological and global gene expression of bone tissues grafted with HPD. The HPD was prepared to 250-500 µm in size. X-ray diffraction (XRD) and energy dispersive x-ray spectroscopy (EDX) were performed to confirm the crystal structure, organic compound residues, and surface morphology, respectively...
December 2, 2016: Biomedical Materials
https://www.readbyqxmd.com/read/27910817/on-the-molecular-interaction-between-femoral-heads-and-polyethylene-liners-in-artificial-hip-joints-phenomenology-and-molecular-scale-phenomena
#19
Giuseppe Pezzotti, B Sonny Bal, Elisa Casagrande, Nobuhiko Sugano, Bryan J McEntire, Wenliang Zhu, Leonardo Puppulin
The chemical interaction of femoral heads with polyethylene liners is an important new area of research in total hip arthroplasty (THA) as a consequence of an unabating quest for elongated artificial joint lifetimes. It is a topic that goes beyond simple mechanical behavior or wear. It seeks to describe the prosthetic device as a whole by adding chemical considerations to mechanics and abrasion. One of the poorly understood chemical interactions is oxygen affinity of the femoral heads. While oxygen unavoidably diffuses into the non-crystalline enclaves of the polyethylene liner as a result of its contact with the tribolayer, a ceramic femoral head can either attract or release oxygen due to its tribochemical interactions...
December 2, 2016: Biomedical Materials
https://www.readbyqxmd.com/read/27910800/routine-x-ray-of-the-chest-is-not-justified-in-staging-of-cutaneous-melanoma-patients
#20
Caroline Asirvatham Gjørup, Helle Westergren Hendel, Rita Kaae Pilegaard, Cecilie Balslev Willert, Lisbet Rosenkrantz Hölmich
INTRODUCTION: The incidence of cutaneous melanoma is increasing in Denmark and worldwide. However, the prevalence of distant metastases at the time of diagnosis has decreased to 1%. We therefore questioned the value of routine preoperative chest X-ray (CXR) for staging asymptomatic melanoma patients and hypothesised that routine CXR is not justified. METHODS: A retrospective study was conducted on patients undergoing wide local excision and sentinel lymph node biopsy for cutaneous melanoma in the period from 2010 to 2014...
December 2016: Danish Medical Journal
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