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https://www.readbyqxmd.com/read/29161675/a-comparison-of-two-digestion-methods-for-assessing-heavy-metals-level-in-urban-soils-influenced-by-mining-and-industrial-activities
#1
Khaled A M Alsaleh, Helmut Meuser, Adel R A Usman, Mohammad I Al-Wabel, Abdullah S Al-Farraj
A comparison between two digestion methods of hot plate Hossner (total-total) and USEPA method 3051 (total-recoverable) was carried out to suggest a proper method for determining nine heavy metals (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn) content of three urban soils affected by mining (Mahd AD'Dahab) or industrial activities (Riyadh and Jubail) at Saudi Arabia. The results showed no significant differences between two digestion methods for Cd, Cu, Pb and Zn in soils affected by mining and for Cr, Cu, Pb and Zn in soils affected by industrial activities...
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/29161661/chlorogenic-acid-prevents-diabetic-nephropathy-by-inhibiting-oxidative-stress-and-inflammation-through-modulation-of-the-nrf2-ho-1-and-nf-%C3%A4-b-pathways
#3
Liping Bao, Jushuang Li, Dongqing Zha, Lian Zhang, Ping Gao, Tao Yao, Xiaoyan Wu
Oxidative and inflammatory damage have been suggested to play important roles in the pathogenesis of diabetic nephropathy (DN). Chlorogenic acid (CGA) is one of the most abundant polyphenols and has known immunoprotective, antioxidant and anti-inflammatory properties. In the present study, animal experiments were designed to examine the protective effects of CGA in DN, and cellular experiments were designed to explore the underlying mechanisms. CGA significantly attenuated diabetic renal damage based on histological pathology and molecular biological methods...
November 18, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/29161321/association-mapping-unveils-favorable-alleles-for-grain-iron-and-zinc-concentrations-in-lentil-lens-culinaris-subsp-culinaris
#4
Akanksha Singh, Vinay Sharma, Harsh Kumar Dikshit, Muraleedhar Aski, Harish Kumar, Nepolean Thirunavukkarasu, Basavanagouda S Patil, Shiv Kumar, Ashutosh Sarker
Lentil is a major cool-season grain legume grown in South Asia, West Asia, and North Africa. Populations in developing countries of these regions have micronutrient deficiencies; therefore, breeding programs should focus more on improving the micronutrient content of food. In the present study, a set of 96 diverse germplasm lines were evaluated at three different locations in India to examine the variation in iron (Fe) and zinc (Zn) concentration and identify simple sequence repeat (SSR) markers that associate with the genetic variation...
2017: PloS One
https://www.readbyqxmd.com/read/29161311/expression-and-regulation-of-atl9-an-e3-ubiquitin-ligase-involved-in-plant-defense
#5
Fengyan Deng, Tingwei Guo, Mitchell Lefebvre, Steven Scaglione, Christopher J Antico, Tao Jing, Xin Yang, Weixing Shan, Katrina M Ramonell
Plants are continually exposed to a variety of pathogenic organisms, including bacteria, fungi and viruses. In response to these assaults, plants have developed various defense pathways to protect themselves from pathogen invasion. An understanding of the expression and regulation of genes involved in defense signaling is essential to controlling plant disease. ATL9, an Arabidopsis RING zinc finger protein, is an E3 ubiquitin ligase that is induced by chitin and involved in basal resistance to the biotrophic fungal pathogen, Golovinomyces cichoracearum (G...
2017: PloS One
https://www.readbyqxmd.com/read/29161042/conformational-dynamics-of-matrix-metalloproteinase-1%C3%A2-triple-helical-peptide-complexes
#6
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/29161024/performance-and-stability-enhancement-of-in-sn-zn-o-tfts-using-sio2-gate-dielectrics-grown-by-low-temperature-atomic-layer-deposition
#7
Jiazhen Sheng, Ju-Hwan Han, Wan-Ho Choi, Jozeph Park, Jin-Seong Park
Silicon dioxide (SiO2) films were synthesized by plasma enhanced atomic layer deposition (PEALD) using BTBAS (bis(tertiarybutylamino) silane) as the precursor and O2 plasma as the reactant, at a temperature range of 50 to 200 °C. While dielectric constant values larger than 3.7 are obtained at all deposition temperatures, the leakage current levels are drastically reduced to below 10-12 A at temperatures above 150 °C, which are similar to those obtained in thermally oxidized and PECVD grown SiO2. Thin film transistors (TFTs) based on In-Sn-Zn-O (ITZO) semiconductors were fabricated using thermal SiO2, PECVD SiO2 and PEALD SiO2 grown at 150 °C as the gate dielectrics, and superior device performance and stability are observed in the last case...
November 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29160934/highly-efficient-perovskite-solar-cells-based-on-zn2ti3o8-nanoparticles-as-electron-transporting-material-with-efficiency-over-17
#8
Zhong-Ning Chen, Aiying Pang, Deli Shen, Mingdeng Wei
Developing ternary metal oxides as electron transporting layers (ETL) for perovskite solar cell is highly challenging in the field of third-generation photovoltaics. In this study, highly mesoporous zinc titanate oxide (Zn2Ti3O8) scaffold synthesized by ion-exchange method has been successfully used as ETL for the fabrication of methyl ammonium lead halide (CH3NH3PbI3) perovskite solar cells. The optimized devices exhibit 17.21% power conversion efficiency (PCE) with open circuit voltage (Voc) of 1.02 V, short-circuit current density (Jsc) of 21...
November 21, 2017: ChemSusChem
https://www.readbyqxmd.com/read/29160920/cobalt-catalyzed-electrophilic-amination-of-aryl-and-heteroaryl-zinc-pivalates-with-n-hydroxylamine-benzoates
#9
Yi-Hung Chen, Simon Graßl, Paul Knochel
Aryl- and heteroaryl-zinc pivalates are aminated with O-benzoylhydroxylamines at 25 °C within 2-4 h in the presence of 2-5% CoCl2*2LiCl furnishing the corresponding tertiary arylated or heteroarylated amines in good yields. This electrophilic amination provides also an access to diarylamines and aryl(heteroaryl)amines. A new tuberculosis drug candidate (Q203) was prepared in 6 steps and 56% overall yield using this cobalt-catalyzed amination as the key step.
November 21, 2017: Angewandte Chemie
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
#10
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/29160862/time-resolved-photoluminescence-microscopy-for-the-analysis-of-semiconductor-based-paint-layers
#11
Daniela Comelli, Alessia Artesani, Austin Nevin, Sara Mosca, Victor Gonzalez, Myriam Eveno, Gianluca Valentini
In conservation, science semiconductors occur as the constituent matter of the so-called semiconductor pigments, produced following the Industrial Revolution and extensively used by modern painters. With recent research highlighting the occurrence of various degradation phenomena in semiconductor paints, it is clear that their detection by conventional optical fluorescence imaging and microscopy is limited by the complexity of historical painting materials. Here, we illustrate and prove the capabilities of time-resolved photoluminescence (TRPL) microscopy, equipped with both spectral and lifetime sensitivity at timescales ranging from nanoseconds to hundreds of microseconds, for the analysis of cross-sections of paint layers made of luminescent semiconductor pigments...
November 21, 2017: Materials
https://www.readbyqxmd.com/read/29160823/in-doped-zno-hexagonal-stepped-nanorods-and-nanodisks-as-potential-scaffold-for-highly-sensitive-phenyl-hydrazine-chemical-sensors
#12
Ahmad Umar, Sang Hoon Kim, Rajesh Kumar, Mohammad S Al-Assiri, A E Al-Salami, Ahmed A Ibrahim, Sotirios Baskoutas
Herein, we report the growth of In-doped ZnO (IZO) nanomaterials, i.e., stepped hexagonal nanorods and nanodisks by the thermal evaporation process using metallic zinc and indium powders in the presence of oxygen. The as-grown IZO nanomaterials were investigated by several techniques in order to examine their morphological, structural, compositional and optical properties. The detailed investigations confirmed that the grown nanomaterials, i.e., nanorods and nanodisks possess well-crystallinity with wurtzite hexagonal phase and grown in high density...
November 21, 2017: Materials
https://www.readbyqxmd.com/read/29160708/photophysics-of-zinc-porphyrin-aggregates-in-dilute-water-ethanol-solutions
#13
Amy L Stevens, Neeraj Kumar Joshi, Matthew F Paige, Ronald Paul Steer
Dimeric and multimeric aggregates of a model metalloporphyrin, zinc tetraphenylporphyrin (ZnTPP), have been produced in a controlled manner by incrementally increasing the water content of dilute aqueous ethanol solutions. Steady state absorption, fluorescence emission and fluorescence excitation spectra have been measured to identify the aggregates present as a function of solvent composition. The dynamics of the excited states of the aggregates produced initially by excitation in the Soret region have been measured by ultrafast fluorescence upconversion techniques...
November 21, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29160685/graphene-oxide-a-new-carrier-for-slow-release-of-plant-micronutrients
#14
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/29160227/enhanced-green-upconversion-luminescence-in-zno-er3-yb3-on-mo6-co-doping-for-temperature-sensor-application
#15
R Anjana, Subha P P, Kurias K Markose, Madambi K Jayaraj
Erbium (Er) doped zinc oxide (ZnO) powder was prepared using co-precipitation method. Effect of ytterbium (Yb) and molybdenum (Mo) co-doping on upconversion emission was studied. The emission intensity has been enhanced on Yb co-doping due to energy transfer from Yb to Er. Co-doping Mo in ZnO:Er, Yb has brought a significant enhancement in green upconversion emission, when excited with 980 nm laser. The enhancement in green emission on Mo doping is because of the formation of Yb3+-MoO42- dimer. Since ZnO is a material having high thermal stability the enhanced green emission in Mo, Er, Yb doped ZnO can be used for temperature sensor applications...
November 21, 2017: Methods and Applications in Fluorescence
https://www.readbyqxmd.com/read/29160218/antimicrobial-resistance-heavy-metal-resistance-and-integron-content-in-bacteria-isolated-from-a-south-african-tilapia-aquaculture-system
#16
Hafizah Y Chenia, Anelet Jacobs
Antibacterial compounds and metals co-select for antimicrobial resistance when bacteria harbour resistance genes towards both types of compounds, facilitating the proliferation and evolution of antimicrobial and heavy metal resistance. Antimicrobial and heavy metal resistance indices of 42 Gram-negative bacteria from a tilapia aquaculture system were determined to identify possible correlations between these phenotypes. Agar dilution assays were carried out to determine susceptibility to cadmium, copper, lead, mercury, chromate and zinc, while susceptibility to 21 antimicrobial agents was investigated by disk diffusion assays...
November 21, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/29159702/evaluation-of-levels-sources-and-health-hazards-of-road-dust-associated-toxic-metals-in-jalalabad-and-kabul-cities-afghanistan
#17
Waqar Azeem Jadoon, Wahdatullah Khpalwak, Russel Chrispine Garven Chidya, Sherif Mohamed Mohamed Ali Abdel-Dayem, Kazuhiko Takeda, Masood Arshad Makhdoom, Hiroshi Sakugawa
This study was designed to investigate selected road-dust associated heavy metals, their relations with natural and anthropogenic sources, and potential human and environmental health risks. For this purpose, 42 and 36 road-dusts samples were collected from Jalalabad and Kabul cities (Afghanistan), respectively. The following elements were found in descending concentrations: Mn, Zn, Pb, Ni, Cu, Cr, Co, and Cd in Jalalabad; and Mn, Zn, Ni, Cu, Cr, Pb, Co, and Cd in Kabul. Except for Ni, all the elemental contents were less than the Canadian permissible limits in residential/parkland soils...
November 20, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29159470/biogeochemical-assessment-of-the-urban-area-in-moscow
#18
Vadim Ermakov, Leonid Perelomov, Sabsbakhor Khushvakhtova, Sergey Tyutikov, Valentina Danilova, Vladimir Safonov
The biogeochemical and ecological assessment of the industrial city territory including urban soils and trees was carried out. Chemical (macroelement and microelement) composition of the city soils, morphological and biochemical properties of the linden leaves, possible impact of de-icing salts on soil and tree state, the correlation between the content of trace elements, and the S-containing plant compounds (phytochelatins) were included in the assessment. It was found that concentrations of trace elements in the soils near road with intensive traffic are changed from the soils, located at a distance of 40-50 m from the road...
November 21, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29159439/isolation-of-lead-resistant-arthrobactor-strain-gq-9-and-its-biosorption-mechanism
#19
Tianqi Wang, Jun Yao, Zhimin Yuan, Yue Zhao, Fei Wang, Huilun Chen
In this study, lead-resistant bacterium Arthrobacter sp. GQ-9 with a resistant capability to cadmium, zinc, and copper was isolated from a heavy metal polluted soil. Microcalorimetry analysis was applied to assess the strain's microbial activity under Pb(II) stress and suggested that GQ-9's microbial activities under Pb(II) stress were stronger than a non-resistant strain. Biosorption batch experiments revealed that the optimal condition for adsorption of Pb(II) by GQ-9 was pH 5.5, a biomass dosage of 1.2 g L(-1), and an initial Pb(II) concentration of 100 mg L(-1) with a maximum biosorption capacity of 17...
November 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29159435/determination-of-selected-elements-in-canned-food-sold-in-jordan-markets
#20
Adnan M Massadeh, Ayat Allah T Al-Massaedh, Sameh Kharibeh
In this study, the concentrations of seven heavy metals including As, Cd, Cr, Cu, Ni, Pb, and Zn in imported canned food samples of different brands including tuna, beef, sardines, and mushroom were determined. Samples were collected from popular Jordanian market, Irbid city, Northern Jordan (44 samples of each type). The metal concentrations in canned food samples were found to be in the range of 1.85-4.50 μg/g for As, 0.42-0.58 μg/g for Cd, 0.47-1.67 μg/g for Cr, 0.73-0.90 μg/g for Cu, 1.08-2.77 μg/g for Ni, 2...
November 20, 2017: Environmental Science and Pollution Research International
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