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https://www.readbyqxmd.com/read/28738661/semiautomatic-sequential-extraction-of-polycyclic-aromatic-hydrocarbons-and-elemental-bio-accessible-fraction-by-accelerated-solvent-extraction-on-a-single-particulate-matter-sample
#1
Maria Luisa Astolfi, Patrizia Di Filippo, Alessandra Gentili, Silvia Canepari
We describe the optimization and validation of a sequential extractive method for the determination of the polycyclic aromatic hydrocarbons (PAHs) and elements (Al, As, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Se, V and Zn) that are chemically fractionated into bio-accessible and mineralized residual fractions on a single particulate matter filter. The extraction is performed by automatic accelerated solvent extraction (ASE); samples are sequentially treated with dichloromethane/acetone (4:1) for PAHs extraction and acetate buffer (0...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738660/novel-biomimetic-enzyme-for-sensitive-detection-of-superoxide-anions
#2
Fang Peng, Tingting Xu, Fan Wu, Chunxue Ma, Yuhong Liu, Jianying Li, Bo Zhao, Chun Mao
Superoxide anion (O2(•-)), one of the most active reactive oxygen species (ROS) in micro-environment of the human body, is involved in some diseases if there is excess O2(•-) associated with oxidative stress. Accurate detection of its concentration has important medical diagnostic significance. In this work, a new electrochemical sensor was designed and fabricated for sensitive detection based on Mn-superoxide dismutase (MnSOD) that decorated onto the surface of magnetic polymeric nanotubes by surface self-assembly processes...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738613/a-selective-distance-based-paper-analytical-device-for-copper-ii-determination-using-a-porphyrin-derivative
#3
Rimadani Pratiwi, Michael P Nguyen, Slamet Ibrahim, Naoki Yoshioka, Charles S Henry, Daryono H Tjahjono
Meso-tetrakis(1,2-dimethylpyrazolium-4-yl)porphyrin sulfonate (TDMPzP), a water-soluble porphyrin derivative, was synthesized and used as a colorimetric reagent for Cu(2+) detection on a microfluidic paper-based analytical device (µPAD) using distance-based quantification. TDMPzP showed a high selectivity for Cu(2+) detection in aqueous solutions. When Cu(2+) was added to the TDMPzP under acidic conditions, a color change from green to a pink was observed by the naked eye. Under optimized conditions, the application of this system to a distance-based μPAD exhibited good analytical response...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738578/a-simple-method-for-the-multi-elemental-analysis-of-beer-using-total-reflection-x-ray-fluorescence
#4
Ednilton M Gama, Clésia C Nascentes, Roberta P Matos, Gabrielle de C Rodrigues, Guilherme D Rodrigues
A method of direct analysis for quantification of 15 inorganic elements (P, S, Cl, K, Ca, Mn, Fe, Ni, Cu, Zn, Br, As, Rb, Sr and Pb) in beers by Total Reflection X-Ray Fluorescence (TXRF) was developed. The experimental conditions were optimized. Direct analysis was compared with the acid digestion procedure to evaluate the effect matrix and the results were satisfactory. The evaluation of the accuracy and precision was realized by analysis of two certified reference materials of natural and waste water. For the majority of the elements, good agreement was achieved between the certified value and the value measured in the CRM´s...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738558/elemental-source-attribution-signatures-for-calcium-ammonium-nitrate-can-fertilizers-used-in-homemade-explosives
#5
Carlos G Fraga, Alexander V Mitroshkov, Nikhil S Mirjankar, Brian P Dockendorff, Angie M Melville
Calcium ammonium nitrate (CAN) is a widely available fertilizer composed of ammonium nitrate (AN) mixed with some form of calcium carbonate such as limestone or dolomite. CAN is also frequently used to make homemade explosives. The potential of using elemental profiling and chemometrics to match both pristine and reprocessed CAN fertilizers to their factories of origin for use in future forensic investigations was examined. Inductively coupled plasma-mass spectrometry (ICP-MS) was used to determine the concentrations of 64 elements in 125 samples from 11 CAN stocks from 6 different CAN factories...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738557/multielemental-analysis-of-18-essential-and-toxic-elements-in-amniotic-fluid-samples-by-icp-ms-full-procedure-validation-and-estimation-of-measurement-uncertainty
#6
B Markiewicz, A Sajnóg, W Lorenc, A Hanć, I Komorowicz, J Suliburska, R Kocyłowski, D Barałkiewicz
Amniotic fluid is the substantial factor in the development of an embryo and fetus due to the fact that water and solutes contained in it penetrate the fetal membranes in an hydrostatic and osmotic way as well as being swallowed by the fetus. Elemental composition of amniotic fluid influences the growth and health of the fetus, therefore, an analysis of amniotic fluid is important because the results would indicate abnormal levels of minerals or toxic elements. Inductively coupled plasma mass spectroscopy (ICP-MS) is often used for determination of trace and ultra-trace level elements in a wide range of matrices including biological samples because of its unique analytical capabilities...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738527/evaluation-of-heavy-metal-mobilization-in-creek-sediment-influence-of-rac-values-and-ambient-environmental-factors
#7
Guannan Liang, Bo Zhang, Mao Lin, Simiao Wu, Hao Hou, Jia Zhang, Guangren Qian, Xin Huang, Jizhi Zhou
The risk assessment code (RAC) is a common method for assessing heavy metal (HM) mobility and their potential health risks, based on HM total concentration and chemical speciation. In this study, both the RAC and the influence of ambient environmental factors were investigated in a river sediment system. Sixty-eight sediment samples were collected from the main river system in Shanghai, China. The total concentration and chemical speciation of Cu, Zn, Ni, Pb, Cd, Cr, As, and Hg were determined in the samples...
July 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28738158/efficient-interfacially-driven-vehiculization-of-corticosteroids-by-pulmonary-surfactant
#8
Alberto Hidalgo, Fabrizio Salomone, Nieves Fresno, Guillermo Orellana, Antonio Cruz, Jesus Perez-Gil
Pulmonary surfactant is a crucial system to stabilize the respiratory air-liquid interface. Furthermore, pulmonary surfactant has been proposed as an effective method for targeting drugs to the lungs. However, few studies have examined in detail the mechanisms of incorporation of drugs into surfactant, the impact of the presence of drugs on pulmonary surfactant performance at the interface under physiologically-meaningful conditions, or the ability of pulmonary surfactant to use the air-liquid interface to vehiculise drugs to long distances...
July 24, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28737939/several-gd-m-heterometal-organic-frameworks-with-gdn-as-nodes-tunable-structures-and-magnetocaloric-effect
#9
Peng-Fei Shi, Chun-Shuai Cao, Chu-Ming Wang, Bin Zhao
Tunable structures and magnetocaloric effect (MCE) of seven MOFs with [Gdn] as nodes are explored. The [Gdn] node is realized from mononuclear [Gd] to binuclear paddle-wheel [Gd2], tetranuclear tetrahedral [Gd4], and pentanuclear trigonal bipyramidal [Gd5]. Meanwhile, the magnetic entropy changes from 19.4 to 46.0 J·kg(-1)·K(-1). The results reveal that the effect of magnetic density on MCE plays a dominant role for Gd(3+)-based compounds, and high spin ground state of Mn(2+) (S = 5/2) is more favorable to achieve high MCE than that with Zn(2+), Co(2+), and Ni(2+) (Co(2+), S = 3/2; Ni(2+), S = 1)...
July 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28737936/a-ii-geteo6-a-mn-cd-pb-non-centrosymmetric-layered-tellurates-with-pbsb2o6-related-structure
#10
Sun Woo Kim, Zheng Deng, Shuang Yu, Haricharan Padmanabhan, Weiguo Zhang, Venkatraman Gopalan, Changqing Jin, Martha Greenblatt
A(II)GeTeO6 (A = Mn, Cd, Pb), new non-centrosymmetric (NCS) honeycomb-layered tellurates, were synthesized and characterized. A(II)GeTeO6 (A = Mn, Cd, Pb) crystallize in trigonal space group P312 (No. 149) of edge-sharing Ge(4+)O6 and Te(6+)O6 octahedra, which form honeycomb-like-layers in the ab-plane with A(II) (A = Mn, Cd, Pb) cations located between the layers. Their crystal structures are PbSb2O6-related, and the ordering of Ge(4+) and Te(6+) in octahedral environment breaks the inversion symmetry of the parent PbSb2O6 structure...
July 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28737813/the-synthesis-of-cuymnzal1-zox-mixed-oxide-as-a-low-temperature-nh3-scr-catalyst-with-enhanced-catalytic-performance
#11
Qinghua Yan, Sining Chen, Lei Qiu, Yanshan Gao, Dermot O'Hare, Qiang Wang
A new type of low-temperature selective catalytic reduction (SCR) catalyst, CuyMnzAl1-zOx, derived from layered double hydroxides is presented in this contribution. By tuning the Cu/Mn/Al ratio, the optimal catalyst Cu2Mn0.5Al0.5Ox resulted in a NOx conversion of 91.2% at 150 °C, which is much higher than that of all other control catalysts, Cu2AlOx (71.1%), Cu-Mn/γ-Al2O3 (65.23%), and Mn/γ-Al2O3 (59.32%). All samples were characterized in detail using various physico-chemical techniques including XRD, BET, FTIR, TEM, H2-TPR, NH3-TPD, and XPS analyses, and the results revealed that the superior catalytic performance of the Cu2Mn0...
July 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28736508/3-dof-force-sensing-motorized-micro-forceps-for-robot-assisted-vitreoretinal-surgery
#12
Berk Gonenc, Alireza Chamani, James Handa, Peter Gehlbach, Russell H Taylor, Iulian Iordachita
In vitreoretinal surgery, membrane peeling is a prototypical task where a layer of fibrous tissue is delaminated off the retina with a micro-forceps by applying very fine forces that are mostly imperceptible to the surgeon. Previously we developed sensitized ophthalmic surgery tools based on fiber Bragg grating (FBG) strain sensors, which were shown to precisely detect forces at the instrument's tip in two degrees of freedom perpendicular to the tool axis. This paper presents a new design that employs an additional sensor to capture also the tensile force along the tool axis...
June 1, 2017: IEEE Sensors Journal
https://www.readbyqxmd.com/read/28735843/does-arm-lengthening-affect-the-functional-outcome-in-onlay-reverse-shoulder-arthroplasty
#13
Birgit S Werner, Francesco Ascione, Giulia Bugelli, Gilles Walch
BACKGROUND: The concept of onlay design reverse shoulder arthroplasty has been introduced to overcome complications observed with the traditional Grammont-type prosthesis. The aim of this study was to determine the influence of arm lengthening on the short-term clinical outcome in onlay reverse shoulder arthroplasty and investigate the effect of humeral tray offset positioning on arm lengthening and range of motion. METHODS: We retrospectively evaluated 56 patients undergoing reverse shoulder arthroplasty with the Aequalis Ascend Flex prosthesis (Tornier, Bloomington, MN, USA) at a minimum 2 years' follow-up...
July 20, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28735435/examination-of-honeys-and-flowers-as-soil-element-indicators
#14
Nikolett Czipa, Gerda Diósi, Clive Phillips, Béla Kovács
Detection of soil element deficiencies is time consuming, requiring a major commitment for field work and analysis. Bees concentrate some elements in their honey which could allow soil element concentrations to be predicted without having to take large numbers of soil samples. We measured 14 element concentrations in soil, sunflower, acacia flower and honey samples from two different regions of Hungary. Across sites, the elements with significant correlation coefficients between honey and soil concentrations, in descending order of probability, were Cu > Ba >Sr = Ni > Zn > Mn = Pb >As...
August 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28735383/brucellosis-causes-alteration-in-trace-elements-and-oxidative-stress-factors
#15
Naser Zanganeh, Ehsan Siahpoushi, Nejat Kheiripour, Sima Kazemi, Mohammad Taghi Goodarzi, Mohammad Yousef Alikhani
Brucellosis is regarded as one of the most common diseases among humans and livestock. In the present study, we aimed to assess the effect of this disease on the level of various cations including copper (Cu), manganese (Mn), zinc (Zn), and magnesium (Mg) as well as oxidative stress status in the serum of people suffering from brucellosis. The present case-study was carried out on 40 patients with brucellosis (case) and 20 healthy people (control). Blood specimens were taken from all the people and the level of essential trace elements and oxidative stress status were measured...
July 22, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28735238/the-influence-of-heavy-metals-on-toxicogenetic-damage-in-a-brazilian-tropical-river
#16
Leomá A Matos, Ana C S Cunha, Aline A Sousa, Jéssica P R Maranhão, Nathanyel R S Santos, Matheus de M C Gonçalves, Sandra M M de M Dantas, João M de C E Sousa, Ana P Peron, Felipe Cavalcanti Carneiro da Silva, Marcus V O B de Alencar, Md Torequl Islam, Raí Pablo Sousa de Aguiar, Ana A de C Melo-Cavalcante, Claúdia C Bonecker, Horácio F J Junior
Anthropogenic activities in tropical rivers favor the eutrophication process, which causes increased concentration of heavy metals. The presence and bioaccumulation of metals are directly related to the presence of genotoxic damage in aquatic organisms. Thus, we evaluated the presence of heavy metals (Fe, Zn, Cr, Cu and Al) and performed toxicogenetic tests in surface (S) and bottom (B) of water samples of the Poti river (Piaui/Brazil). Cytotoxicity and genotoxicity tests were performed in Allium cepa, and micronucleus (MN) and comet assay were performed in Oreochromis niloticus...
July 19, 2017: Chemosphere
https://www.readbyqxmd.com/read/28735183/reductive-dechlorination-of-trichloroethylene-by-polyvinylpyrrolidone-stabilized-nanoscale-zerovalent-iron-particles-with-ni
#17
Macharla Arun Kumar, Sungjun Bae, Seunghee Han, Yoonseok Chang, Woojin Lee
We developed a novel stabilized nanoscale zerovalent iron (NZVI) particles with Ni using an electron conducting polymer, polyvinylpyrrolidone (PVP), to selectively dechlorinate trichloroethylene (TCE) to non-toxic intermediates. The size of the PVP stabilized NZVI-Ni ((PVP-NZVI-Ni), average diameter: ∼20nm) is smaller than that of bare NZVI (50-80nm) due to the prevention of agglomeration of the resultant iron particles by PVP. PVP-NZVI-Ni showed a complete removal of TCE in 1h with superior dechlorination kinetics (kobs=5...
July 14, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28735114/determination-of-impurities-in-graphite-using-synchrotron-radiation-based-x-ray-fluorescence-spectrometry
#18
M Ghosh, K K Swain, P S Remya Devi, T A Chavan, A K Singh, M K Tiwari, R Verma
Determination of impurities namely Ca, Mn, Fe, Ni, Zn, Sr and Pb in graphite by energy dispersive X-ray fluorescence spectrometry is described using microfocused synchrotron radiation. The internal standard and standard addition methodologies were adopted for quantification and the results were compared with tube-based X-ray fluorescence spectrometry. Analysis of the results by the F and t-tests revealed their statistical equivalence. Synchrotron measurements improved the detection limits by an order of magnitude compared to the tube based technique...
July 14, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28734985/safety-of-catheter-ablation-for-atrial-fibrillation-using-fiber-optic-based-contact-force-sensing
#19
Moussa Mansour, Dhanunjaya Lakkireddy, Douglas Packer, John D Day, Srijoy Mahapatra, Kyle Brunner, Vivek Reddy, Andrea Natale
BACKGROUND: While the body of evidence showing the benefit of contact force (CF) sensing catheters in improving AF ablation success rate is growing, real-world safety data of this technology are limited. OBJECTIVE: The aim of this study is to report the complication rate in patients undergoing ablation using one specific CF sensing catheter (TactiCath™Quartz Contact Force Ablation Catheter (Abbott, St Paul, MN)) in a large worldwide database. METHODS: - User-reported adverse event data from January 2014 - December 2015 was reviewed for the ablation catheter...
July 19, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28734967/assessment-of-complex-water-pollution-with-heavy-metals-and-pyrethroid-pesticides-on-transcript-levels-of-metallothionine-and-immune-related-genes
#20
Haneen A Ghazy, Mohamed A S Abdel-Razek, Abeer F El Nahas, Shawky Mahmoud
Alteration of immunological function of an aquatic organism can be used as an indicator for evaluating the direct effect of exposure to pollutants. The aim of this work is to assess the impact of complex water pollution with special reference to Pyrethroid pesticides and heavy metals on mRNA transcript levels of Metallothionine and some immune related genes of Nile tilapia (Oreochromas Niloticus). Residues of six heavy metals and six Pyrethroid were assessed in water as well as fish tissues at three different sites of Lake Burullus, located at Northern Egypt...
July 19, 2017: Fish & Shellfish Immunology
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