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https://www.readbyqxmd.com/read/29353175/phyto-management-of-chromium-contaminated-soils-through-sunflower-under-exogenously-applied-5-aminolevulinic-acid
#1
Mujahid Farid, Shafaqat Ali, Muhammad Rizwan, Qasim Ali, Rashid Saeed, Tauqir Nasir, Ghulam Hasan Abbasi, Muhammad Ishaq Asif Rehmani, Syed Tahir Ata-Ul-Karim, Syed Asad Hussain Bukhari, Tanvir Ahmad
Soil contamination with heavy metals is threatening the food security around the globe. Chromium (Cr) contamination results in poor quality and reduction in yield of crops. The present research was performed to figure out the Cr toxicity in sunflower and the ameliorative role of 5-aminolevulinic acid (ALA) as a plant growth regulator. The sunflower (FH-614) was grown under increasing concentration of Cr (0, 5, 10 and 20mgkg-1) alone and/or in combination with 5-ALA (0, 10 and 20mgL-1). Results showed that Cr suppressed the overall growth, biomass, gas exchange attributes and chlorophyll content of sunflower plants...
January 17, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29353168/zinc-and-lead-detoxifying-abilities-of-humic-substances-relevant-to-environmental-bacterial-species
#2
L V Perelomov, Binoy Sarkar, O I Sizova, K B Chilachava, A Y Shvikin, I V Perelomova, Y M Atroshchenko
The effect of humic substances (HS) and their different fractions (humic acids (HA) and hymatomelanic acids (HMA)) on the toxicity of zinc and lead to different strains of bacteria was studied. All tested bacteria demonstrated a lower resistance to zinc than lead showing minimum inhibitory concentrations of 0.1 - 0.3mM and 0.3-0.5mM, respectively. The highest resistance to lead was characteristic of Pseudomonas chlororaphis PCL1391 and Rhodococcus RS67, while Pseudomonas chlororaphis PCL1391 showed the greatest resistance to zinc...
January 17, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29353014/neuroprotective-effect-of-morin-on-lead-acetate-induced-apoptosis-by-preventing-cytochrome-c-translocation-via-regulation-of-bax-bcl-2-ratio
#3
Sumathi Thangarajan, Aishwarya Vedagiri, Shanmathy Somasundaram, Rathika Sakthimanogaran, Mahalakshmi Murugesan
Lead (Pb) intoxication is a prevalent type of environmental toxicity as well as minimal amount of lead exposure is liable for neurobehavioral or perhaps intelligence defects. The present study was undertaken to investigate the beneficial effects of morin in protecting the lead acetate (PbAc)-induced oxidative stress in rat brain. PbAc intoxication resulted in motor deficit, memory impairment and oxidative stress Further, PbAc administration alters Bax/Bcl-2 expression thereby increases cytochrome c release from the mitochondria...
January 15, 2018: Neurotoxicology and Teratology
https://www.readbyqxmd.com/read/29352915/silver-i-dithiocarbamate-on-modified-magnetic-cellulose-synthesis-density-functional-theory-study-and-application
#4
Samaneh Sabaqian, Firouzeh Nemati, Hossein Taherpour Nahzomi, Majid M Heravi
A magnetically retrievable catalytic system involving Ag(I) dithiocarbamate supported on functionalized cellulose was prepared. The structure of this hybrid nano-composite was characterized by various techniques. In addition, to describe the metal-ligand interactions present in the nano-composite, covalent and electrostatic interactions, density functional theory model and quantum theory of atoms in molecule method were employed. The resultant nano-composite exhibits remarkable catalytic efficacy in the synthesis of 2-amino-6-(2-oxo-2H-chromen-3-yl)-4-phenylnicotinonitriles from the reaction of 3-acetylcoumarin, aromatic aldehydes, and malononitrile...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352793/theoretical-study-of-tetrahedral-site-occupation-by-hydrogen-in-pd-nanoparticles
#5
Takayoshi Ishimoto, Michihisa Koyama
To understand the enhanced effects and new hydrogen absorption properties of metal nanoparticles, we theoretically investigated the hydrogen absorption in Pd nanoparticles, adopting the Pd405 model of ca. 2.5 nm by using density functional theory. Pd405 showed inhomogeneous geometric features, especially near the surface region. The hydrogen absorptions in octahedral (O) and tetrahedral (T) sites near the core region were stable and unstable, respectively, similar to the Pd bulk. We clearly demonstrated the possibility of hydrogen absorption in T sites near the surface of Pd405...
January 21, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29352780/hydrogen-collisions-with-transition-metal-surfaces-universal-electronically-nonadiabatic-adsorption
#6
Yvonne Dorenkamp, Hongyan Jiang, Hansjochen Köckert, Nils Hertl, Marvin Kammler, Svenja M Janke, Alexander Kandratsenka, Alec M Wodtke, Oliver Bünermann
Inelastic scattering of H and D atoms from the (111) surfaces of six fcc transition metals (Au, Pt, Ag, Pd, Cu, and Ni) was investigated, and in each case, excitation of electron-hole pairs dominates the inelasticity. The results are very similar for all six metals. Differences in the average kinetic energy losses between metals can mainly be attributed to different efficiencies in the coupling to phonons due to the different masses of the metal atoms. The experimental observations can be reproduced by molecular dynamics simulations based on full-dimensional potential energy surfaces and including electronic excitations by using electronic friction in the local density friction approximation...
January 21, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29352728/differential-proteomic-analysis-of-synovial-fluid-from-hip-arthroplasty-patients-with-a-pseudotumor-vs-periprosthetic-osteolysis
#7
Isabelle Catelas, Eric A Lehoux, Zhibin Ning, Daniel Figeys, Stephen J Baskey, Paul E Beaulé
Adverse tissue reactions to metal implants, including pseudotumors, can compromise implant functionality and survivorship. The identification of specific proteins in the synovial fluid (SF) of hip arthroplasty patients with a pseudotumor may lead to a better understanding of the underlying pathomechanisms. The objective of the present study was to compare the protein content of SF from patients with a short-term metal-on-metal hip implant associated with a pseudotumor and patients with a long-term metal-on-polyethylene hip implant associated with periprosthetic osteolysis...
January 20, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29352588/pulmonary-reinterventions-after-complete-unifocalization-and-repair-in-infants-and-young-children-with-tetralogy-of-fallot-with-major-aortopulmonary-collaterals
#8
Holly Bauser-Heaton, Alejandro Borquez, Ritu Asija, Lisa Wise-Faberowski, Yulin Zhang, Laura Downey, Stanton B Perry, Andrew Koth, Lynn F Peng, Claudia A Algaze, Frank L Hanley, Doff B McElhinney
BACKGROUND: Our institutional approach to tetralogy of Fallot (TOF) with major aortopulmonary collaterals (MAPCAs) emphasizes unifocalization and augmentation of the reconstructed pulmonary arterial (PA) circulation and complete intracardiac repair in infancy, usually in a single procedure. This approach yields a high rate of complete repair with excellent survival and low right ventricular (RV) pressure. However, little is known about remodeling of the unifocalized and reconstructed pulmonary circulation or about reinterventions on the reconstructed PAs or the RV outflow tract conduit...
December 13, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29352436/posterolateral-tibial-plateau-fractures-how-to-buttress-reversed-l-posteromedial-or-the-posterolateral-approach-a-comparative-cadaveric-study
#9
Wich Orapiriyakul, Theerachai Apivatthakakul, Chanakarn Phornphutkul
INTRODUCTION: The selection of a surgical approach for buttressing posterolateral tibial plateau fractures is controversial. OBJECTIVE: This study compared the surgical exposure area between the reversed L posteromedial approach (R-PM) and the posterolateral (PL) approach using the lateral plateau width as a metric. MATERIALS AND METHODS: Twenty lower extremities from fresh frozen cadavers were included. The R-PM approach was used first and the boundary of the posterior tibial cortex exposure was marked with metal pins...
January 19, 2018: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29352397/bio-prospectus-of-cadmium-bioadsorption-by-lactic-acid-bacteria-to-mitigate-health-and-environmental-impacts
#10
REVIEW
Narendra Kumar, Vandna Kumari, Chand Ram, Kiran Thakur, Sudhir Kumar Tomar
Foodstuffs and water are the key sources of cadmium biomagnifiaction. The available strategies to mitigate this problem are unproductive and expensive for practical large-scale use. Biological decontamination of metals through environmental microbes has been known since long time, whereas lactic acid bacteria (LAB) have not been extensively studied for this purpose. The LAB are known for maintaining homeostasis and suppression of pathogens in humans and animals. They also play a vital role in bioremediation of certain heavy metals...
January 19, 2018: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29352228/dual-band-metamaterial-antenna-for-lte-bluetooth-wimax-system
#11
Md Mehedi Hasan, Mohammad Rashed Iqbal Faruque, Mohammad Tariqul Islam
A compact metamaterial inspired antenna operate at LTE, Bluetooth and WiMAX frequency band is introduced in this paper. For the lower band, the design utilizes an outer square metallic strip forcing the patch to radiate as an equivalent magnetic-current loop. For the upper band, another magnetic current loop is created by adding metamaterial structure near the feed line on the patch. The metamaterial inspired antenna dimension of 42 × 32 mm2 compatible to wireless devices. Finite integration technique based CST Microwave Studio simulator has been used to design and numerical investigation as well as lumped circuit model of the metamaterial antenna is explained with proper mathematical derivation...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352203/advanced-modified-polyacrylonitrile-membrane-with-enhanced-adsorption-property-for-heavy-metal-ions
#12
Xinfeng Zhang, Shujing Yang, Bing Yu, Qinglong Tan, Xiaoyan Zhang, Hailin Cong
Advanced modified polyacrylonitrile (PAN) membrane with high adsorption property for heavy metal ions was designed and fabricated for the first time. The introduced diazoresin-ethylenediaminetetraacetic acid (DR-EDTA) layer could effectively absorb the metal ion, such as Cu2+, Pb2+, Hg2+ in the waste water. The effects of layers, metal ion concentration, pH, temperature and cycle time were investigated. The results showed that the adsorption isotherms for Cu2+ were well fitted by Langmuir model. The maximum adsorption capacity of the modified membrane for Cu2+ was approximately 47...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352192/full-wave-electromagnetic-optimisation-of-corrugated-metallic-reectors-using-a-multigrid-approach
#13
Gökhan Karaova, Aşkın Altınoklu, Özgür Ergül
A multigrid optimisation strategy is introduced to design passive metallic reflectors with corrugated shapes. The strategy is based on using genetic algorithms at multiple grids and shaping the metal sheets, starting from coarse details to fine tunings. This corresponds to a systematic expansion of the related optimisation space, which is explored more efficiently in comparison to a brute-force optimisation without using grid. By employing the multilevel fast multipole algorithm to analyse the electromagnetic problems corresponding to optimisation trials, we obtain accurately designed reflectors that provide focussing abilities with very high performances at single and multiple locations...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352177/photonic-spin-hall-effect-enabled-refractive-index-sensor-using-weak-measurements
#14
Xinxing Zhou, Lijuan Sheng, Xiaohui Ling
In this work, we theoretically propose an optical biosensor (consists of a BK7 glass, a metal film, and a graphene sheet) based on photonic spin Hall effect (SHE). We establish a quantitative relationship between the spin-dependent shift in photonic SHE and the refractive index of sensing medium. It is found that, by considering the surface plasmon resonance effect, the refractive index variations owing to the adsorption of biomolecules in sensing medium can effectively change the spin-dependent displacements...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352141/pressure-effect-on-impurity-local-vibrational-mode-and-phase-transitions-in-n-type-iron-doped-indium-phosphide
#15
Chih-Ming Lin, I-Jui Hsu, Sin-Cheng Lin, Yu-Chun Chuang, Wei-Ting Chen, Yen-Fa Liao, Jenh-Yih Juang
The evolution of iron local vibrational mode (Fe LVM) and phase transitions in n-type iron-doped indium phosphide (InP:Fe) were investigated at ambient temperature. In-situ angle-dispersive X-ray diffraction measurements revealed that InP:Fe starts to transform from zinc-blende (ZB) to rock-salt (RS) structure around 8.2(2) GPa and completes around 16.0(2) GPa. The Raman shift of both transverse and longitudinal optical modes increases monotonically with increasing pressure, while their intensities become indiscernible at 11...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352140/ultra-high-photoresponsivity-in-suspended-metal-semiconductor-metal-mesoscopic-multilayer-mos2-broadband-detector-from-uv-to-ir-with-low-schottky-barrier-contacts
#16
Gustavo A Saenz, Goran Karapetrov, James Curtis, Anupama B Kaul
The design, fabrication, and characterization of ultra-high responsivity photodetectors based on mesoscopic multilayer MoS2 is presented, which is a less explored system compared to direct band gap monolayer MoS2 that has received increasing attention in recent years. The device architecture is comprised of a metal-semiconductor-metal (MSM) photodetector, where Mo was used as the contact metal to suspended MoS2 membranes. The photoresponsivity [Formula: see text] was measured to be ~1.4 × 104 A/W, which is > 104 times higher compared to prior reports, while the detectivity D* was computed to be ~2...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352079/identification-and-validation-of-a-new-source-of-low-grain-cadmium-accumulation-in-durum-wheat
#17
Atena Oladzad Abbasabadi, Ajay Kumar, Seyed Pirseyedi, Evan Salsman, Marina Dobrydina, Roshan Sharma Poudel, Wesam A AbuHammad, Shiaoman Chao, Justin D Faris, Elias M Elias
Cadmium (Cd) is a heavy metal that has no known biological function and is toxic for many living organisms. The maximum level of Cd concentration allowed in the international market for wheat grain is 0.2 mg kg-1. Because phenotyping for Cd uptake is expensive and time consuming, molecular markers associated with genes conferring low Cd uptake would expedite selection and lead to the development of durum cultivars with reduced Cd concentrations. Here, we identified single nucleotide polymorphisms (SNPs) associated with a novel low Cd uptake locus in the durum experimental line D041735, which has hexaploid common wheat in its pedigree...
January 19, 2018: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/29351889/disentangling-the-effects-of-low-ph-and-metal-mixture-toxicity-on-macroinvertebrate-diversity
#18
Riccardo Fornaroli, Alessio Ippolito, Mari J Tolkkinen, Heikki Mykrä, Timo Muotka, Laurie S Balistrieri, Travis S Schmidt
One of the primary goals of biological assessment of streams is to identify which of a suite of chemical stressors is limiting their ecological potential. Elevated metal concentrations in streams are often associated with low pH, yet the effects of these two potentially limiting factors of freshwater biodiversity are rarely considered to interact beyond the effects of pH on metal speciation. Using a dataset from two continents, a biogeochemical model of the toxicity of metal mixtures (Al, Cd, Cu, Pb, Zn) and quantile regression, we addressed the relative importance of both pH and metals as limiting factors for macroinvertebrate communities...
January 16, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29351719/synergistic-and-antagonistic-interactions-among-the-particulate-matter-components-in-generating-reactive-oxygen-species-based-on-the-dithiothreitol-assay
#19
Haoran Yu, Jinlai Wei, Yilan Cheng, Kiran Subedi, Vishal Verma
We assessed the interactions among the particulate matter (PM) components in generating the reactive oxygen species (ROS) based on a dithiothreitol (DTT) assay. We started with the standard solutions of known redox-active substances, i.e. quinones (9,10-phenanthraquinone, 1,2-naphthoquinone, 1,4-naphthoquinone and 5-hydroxy-1,4-naphthoquinone) and metals [Cu (II), Mn (II) and Fe (II)]. Both DTT consumption and hydroxyl radical (•OH) generation were measured in the DTT assay. The interactions of Fe were additive with quinones in DTT consumption, but strongly synergistic in •OH generation...
January 19, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29351606/analysis-of-metal-tolerance-in-rhizobium-leguminosarum-strains-isolated-from-an-ultramafic-soil
#20
Laura Rubio-Sanz, Belén Brito, Jose Palacios
Natural habitats containing high amounts of heavy metals provide a valuable source of bacteria adapted to deal with metal toxicity. A functional analysis of the population of legume endosymbiotic bacteria in an ultramafic soil was undertaken by studying a collection of Rhizobium leguminosarum bv viciae (Rlv) isolates obtained using pea as trap plant. One of the isolates, Rlv UPM1137, was selected on the basis of its higher tolerance to nickel and cobalt and presence of inducible mechanisms for such tolerance...
January 17, 2018: FEMS Microbiology Letters
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