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https://www.readbyqxmd.com/read/28822345/assessment-of-oxidative-stress-and-bioaccumulation-of-the-metals-cu-fe-zn-pb-cd-in-the-polychaete-perinereis-gualpensis-from-estuaries-of-central-chile
#1
Hernán Gaete, Manuel Álvarez, Gabriela Lobos, Eulogio Soto, Carlos Jara-Gutiérrez
The estuaries of the Aconcagua and Maipo Rivers of central Chile are receptors of residues that contain metals from anthropic activities including agriculture, mining and smelters, which have different levels in the two basins. This study postulates that the exposition to metals is different in the two estuaries and that their sediments contain bioavailable chemical agents that produce oxidative stress. The aim of the study was to evaluate the effect of estuarine sediments on the polychaete Perinereis gualpensis using oxidative stress biomarkers and to determine the metal concentrations in sediments and their accumulation in P...
August 16, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28822338/in-vitro-bioaccessibility-and-health-risk-assessment-of-heavy-metals-in-atmospheric-particulate-matters-from-three-different-functional-areas-of-shanghai-china
#2
Huang Huang, Ying Jiang, Xiaoyun Xu, Xinde Cao
The bioaccessibility and human health risks of heavy metals in PM2.5 and PM10 samples from three functional areas of Shanghai, China including a commercial area (CA), a residential area (RA), and an industrial area (IA), were investigated. Gamble's solution and physiologically based extraction test were employed to simulate human respiratory and digestive system, respectively. Both PM2.5 and PM10 concentration in the three areas exceeded the guideline of WHO, and followed the order of IA>CA≈RA. Zinc and Pb were the most abundant metals with a concentration range of 0...
August 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28822292/nanoparticles-assemblies-on-demand-controlled-aggregation-of-ag-0-mediated-by-modified-peptoid-sequences
#3
Hagar Tigger-Zaborov, Galia Maayan
Assemblies of metal nanoparticles (NPs) have been broadly used for the construction of materials with distinct spectroscopic properties towards sensing applications. On the other hand, well-dispersed NPs are exploit for applications in catalysis and medicine. Biopolymers or biomimetic oligomers can serve both as efficient stabilizers of NPs and as useful aggregation mediators that can lead to assemblies with unique properties. Controlling aggregation processes, however, is still challenging and often relies on trial and error rather than on defined thumb rules...
August 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28822276/exploiting-algal-mineralization-for-nanotechnology-bringing-coccoliths-to-the-fore
#4
REVIEW
Alastair W Skeffington, André Scheffel
Complex mineral structures are produced by many microalgal species. Pioneering work on diatom silica has demonstrated the potential of such structures in nanotechnology. The calcified scales of coccolithophores (coccoliths) have received less attention, but the large diversity of architectures make coccoliths attractive as parts for nano-devices. Currently coccolith calcite can be modified by the incorporation of metal ions or adsorption of enzymes to the surface, but genetic modification of coccolithophores may permit the production of coccoliths with customized architectures and surface properties...
August 16, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28822266/endogenous-non-enzymatic-antioxidants-in-the-human-body
#5
Iwona Mirończuk-Chodakowska, Anna Maria Witkowska, Małgorzata Elżbieta Zujko
The exposure of cells, tissues and extracellular matrix to harmful reactive species causes a cascade of reactions and induces activation of multiple internal defence mechanisms (enzymatic or non-enzymatic) that provide removal of reactive species and their derivatives. The non-enzymatic antioxidants are represented by molecules characterized by the ability to rapidly inactivate radicals and oxidants. This paper focuses on the major intrinsic non-enzymatic antioxidants, including metal binding proteins (MBPs), glutathione (GSH), uric acid (UA), melatonin (MEL), bilirubin (BIL) and polyamines (PAs)...
August 16, 2017: Advances in Medical Sciences
https://www.readbyqxmd.com/read/28822260/bioavailability-and-chronic-toxicity-of-bismuth-citrate-to-earthworm-eisenia-andrei-exposed-to-natural-sandy-soil
#6
Zohra Omouri, Jalal Hawari, Michel Fournier, Pierre Yves Robidoux
The present study describes bioavailability and chronic effects of bismuth to earthworms Eisenia andrei using OECD reproduction test. Adult earthworms were exposed to natural sandy soil contaminated artificially by bismuth citrate. Average total concentrations of bismuth in soil recovered by HNO3 digestion ranged from 75 to 289mg/kg. Results indicate that bismuth decreased significantly all reproduction parameters of Eisenia andrei at concentrations ≥ 116mg/kg. However, number of hatched cocoons and number of juveniles seem to be more sensitive than total number of cocoons, as determined by IC50; i...
August 16, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28822250/polyaspartate-extraction-of-cadmium-ions-from-contaminated-soil-evaluation-and-optimization-using-central-composite-design
#7
Nuhu Dalhat Mu'azu, Shamsudeen A Haladu, Nabeel Jarrah, Mukarram Zubair, Mohammad H Essa, Shaikh A Ali
The occurrences of heavy metal contaminated sites and soils and the need for devising environmentally friendly solutions have become global issues of serious concern. In this study, polyaspartate (a highly biodegradable agent) was synthesized using L-Aspartic acid via a new modified thermal procedure and employed for extraction of cadmium ions (Cd) from contaminated soil. Response surface methodology approach using 3(5) full faced centered central composite design was employed for modeling, evaluating and optimizing the influence of polyaspartate concentration (36-145mM), polyaspartate/soil ratio (5-25), initial heavy metal concentration (100-500mg/kg), initial pH (3-6) and extraction time (6-24h) on Cd ions extracted into the polyaspartate solution and its residual concentration in the treated soil...
August 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28822249/en-masse-pyrolysis-of-flexible-printed-circuit-board-wastes-quantitatively-yielding-environmental-resources
#8
Jang Won Kim, Albert S Lee, Seunggun Yu, Jeong Whan Han
This paper reports the recycling of flexible printed circuit board (FPCB) waste through carbonization of polyimide by dual pyrolysis processes. The organic matter was recovered as pyrolyzed oil at low temperatures, while valuable metals and polyimide-derived carbon were effectively recovered through secondary high temperature pyrolysis. The major component of organics extracted from FPCB waste comprised of epoxy resins were identified as pyrolysis oils containing bisphenol-A. The valuable metals (Cu, Ni, Ag, Sn, Au, Pd) in waste FPCB were recovered as granular shape and quantitatively analyzed via ICP-OES...
August 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28822248/tio2-nanoparticles-in-sediments-effect-on-the-bioavailability-of-heavy-metals-in-the-freshwater-bivalve-corbicula-fluminea
#9
Xiulei Fan, Chao Wang, Peifang Wang, Bin Hu, Xun Wang
Most studies investigating the influence of TiO2 NPs on heavy metal bioavailability have focused on the aqueous phase; however, few have examined the sediments containing more nanoparticles. Here, we investigated the effects of TiO2 NPs on heavy metal bioavailability in C. fluminea in sediments. The interactions between the TiO2 NPs and metals in sediments, the influence of TiO2 NPs on metals levels in aqueous phase and geochemical speciation were also explored. The results indicated the large adsorption capacity of TiO2 NPs and the strong adsorption affinity to metals caused the metals adsorbed on nanoparticles, which decreased the metals concentrations in water phase...
July 21, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28822247/mobile-phones-an-asset-or-a-liability-a-study-based-on-characterization-and-assessment-of-metals-in-waste-mobile-phone-components-using-leaching-tests
#10
Meenakshi Hira, Sudesh Yadav, P Morthekai, Anurag Linda, Sushil Kumar, Anupam Sharma
The prolonged use of old fashioned gadgets, especially mobile phones, is declining readily with the advancement in technology which ultimately lead to generation of e-waste. The present study investigates the concentrations of nine metals (Ba, Cd, Cr, Cu, Fe, Ni, Pb, Sn, and Zn) in various components of the mobile phones using Toxicity Characteristic Leaching Procedure (TCLP), Waste Extraction Test (WET) and Synthetic Precipitation Leaching Procedure (SPLP). The results were compared with the threshold limits for hazardous waste defined by the California Department of Toxic Substances Control (CDTSC) and United States Environmental Protection Agency (USEPA)...
August 5, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28822238/the-environmental-injustice-of-beauty-framing-chemical%C3%A2-exposures-from-beauty-products-as-a-health%C3%A2-disparities-concern
#11
Ami R Zota, Bhavna Shamasunder
The obstetrics-gynecology community has issued a call to action to prevent toxic environmental chemical exposures and their threats to healthy human reproduction. Recent committee opinions recognize that vulnerable and underserved women may be impacted disproportionately by environmental chemical exposures and recommend that reproductive health professionals champion policies that secure environmental justice. Beauty product use is an understudied source of environmental chemical exposures. Beauty products can include reproductive and developmental toxicants such as phthalates and heavy metals; however, disclosure requirements are limited and inconsistent...
August 14, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28822187/-enzymatic-glycosylation-of-4-demethylepipodophyllotoxin
#12
Ke-Bo Xie, Ri-Dao Chen, Yu-Jiao Zhang, Da-Wei Chen, Jun-Gui Dai
The glycosides of 4'-demethylepipodophyllotoxin (DMEP) possess various pharmacological activities; however, the chemical synthesis of these glycosides faces challenges in regioselectivity, stereoselectivity, and the protection and de-protection of functional groups. In this work, a novel glycosyltransferase (GT) gene AbGT5 from Aloe barbadensis was successfully cloned, heterogeneously expressed and purified. Recombinant AbGT5 was able to catalyze the glycosylation of DMEP and the glycosylated product, which was separated from the preparative scale reaction, was characterized as DMEP 4'-O-β-D-glucoside via MS, 1H-NMR, 13C-NMR, HSQC and HMBC...
June 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28822094/quantitative-knee-cartilage-measurement-at-mr-imaging-of-patients-with-anterior-cruciate-ligament-tear
#13
Kazuki Kato, Tamotsu Kamishima, Eiji Kondo, Tomohiro Onodera, Shota Ichikawa
In previous studies, numerous approaches were proposed that assess knee cartilage volume quantitatively using 3D magnetic resonance (MR) imaging. However, the clinical use of these approaches is limited because 3D MR is prone to metal artifacts in postoperative cases. Our purpose in this study was to validate a method for knee cartilage volume quantification using conventional MR imaging in patients who underwent anterior cruciate ligament (ACL) reconstruction surgery. The study included 16 patients who underwent MR imaging before and 1 year after ACL reconstruction surgery...
August 18, 2017: Radiological Physics and Technology
https://www.readbyqxmd.com/read/28822040/the-effect-of-sources-and-air-mass-transport-on-the-variability-of-trace-element-deposition-in-central-poland-a-cluster-based-approach
#14
Patrycja Siudek, Marcin Frankowski
Measurements of trace element (As, Cu, Cd, Cr, Ni, Pb, Zn) deposition fluxes were conducted simultaneously in two contrasted environments, i.e., urban and forest, between April 2013 and October 2014. This was the first such project in central Poland, aimed at long-term observations of trace elements in the atmosphere and their distribution, transport, and deposition pattern. The receptor sites were different in terms of local meteorological conditions, emission potential, and distance to major anthropogenic sources...
August 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28821883/synthesis-of-pincer-type-extractants-for-selective-extraction-of-palladium-from-pgms-an-improved-liquid-liquid-extraction-approach-to-current-refining-processes
#15
Muniyappan Rajiv Gandhi, Manabu Yamada, Kazutoshi Haga, Atsushi Shibayama
SCS pincer ligands 1-4 were synthesised, and their ability to extract Pd(II) from HCl and HNO3 media was studied. The Pd(II) extraction properties of 1-4 were compared with those of commercial extractants (DOS and LIX(®)84-I) in kerosene. 1 and 2 showed superior Pd(II) extractability (E% = 99.9) relative to DOS and LIX(®)84-I from 0.1-8.0 M HCl and to DOS from 0.1-8.0 M HNO3 and mixed HCl + HNO3 media. The Pd(II) extraction rate, acid durability, the most suitable organic/aqueous (O/A) phase ratio, and Pd(II) loading capacity of extractants 1, 2, and DOS were evaluated...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821794/a-twice-electrochemical-etching-method-to-fabricate-superhydrophobic-superhydrophilic-patterns-for-biomimetic-fog-harvest
#16
Xiaolong Yang, Jinlong Song, Junkai Liu, Xin Liu, Zhuji Jin
Superhydrophobic-superhydrophilic patterned surfaces have attracted more and more attention due to their great potential applications in the fog harvest process. In this work, we developed a simple and universal electrochemical-etching method to fabricate the superhydrophobic-superhydrophilic patterned surface on metal superhydrophobic substrates. The anti-electrochemical corrosion property of superhydrophobic substrates and the dependence of electrochemical etching potential on the wettability of the fabricated dimples were investigated on Al samples...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821790/potential-health-risk-of-heavy-metals-in-the-leather-manufacturing-industries-in-sialkot-pakistan
#17
Muhammad Junaid, Muhammad Zaffar Hashmi, Yu-Mei Tang, Riffat Naseem Malik, De-Sheng Pei
This is a systematical report on the potential health risk of heavy metals from the leather industries in Pakistan based on multiple biological matrices of the exposed workers and indoor dust samples. The adverse impacts of heavy metals on the oxidative enzyme and their risks to workers' health were also explored. Our results indicated that the level of Cr in indoor industrial dust was more than twice, compared to the background household dust. Blood, urine and hair samples of exposed workers showed significantly high concentrations of heavy metals, compared to those in the control group...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821779/a-clean-and-facile-synthesis-strategy-of-mos2-nanosheets-grown-on-multi-wall-cnts-for-enhanced-hydrogen-evolution-reaction-performance
#18
Jiamu Cao, Jing Zhou, Yufeng Zhang, Xiaowei Liu
Unique hybrid nanostructure, which consists of multi-wall carbon nanotube (MWCNT) stems and MoS2 nanosheet (NS) leaves, are prepared by a hydrothermal method. The fabricated material can be potentially used as an electrocatalyst for the hydrogen evolution reaction (HER). To our knowledge, as the reaction medium, water is firstly utilized to the synthesis of the 1T phase MoS2 NSs which uniformly grow on the carbon-based materials. As a result, a nanohybrid catalyst with excellent HER electrocatalytic properties, which included an onset potential of as low as 50 mV, a Tafel slope of 43 mV dec(-1), and remarkable cycling stability, is produced...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821723/structural-and-developmental-expression-of-ss-riok-2-an-rio-protein-kinase-encoding-gene-of-strongyloides-stercoralis
#19
Wei-Qiang Lei, James B Lok, Wang Yuan, Yue-Zhou Zhang, Jonathan D Stoltzfus, Robin B Gasser, Si-Yuan He, Huan Zhou, Rui Zhou, Jun-Long Zhao, Min Hu
RIO kinases are essential atypical protein kinases in diverse prokaryotic and eukaryotic organisms, playing significant roles in yeast and humans. However, little is known about their functions in parasitic nematodes. In the present study, we have isolated and characterized the full-length cDNA, gDNA and a putative promoter of a RIOK-2 protein kinase (Ss-RIOK-2) encoding gene (Ss-riok-2) from Strongyloides stercoralis, a medically important parasitic nematode (Order Rhabditida). A three-dimensional structure (3D) model of Ss-RIOK-2 was generated using the Chaetomium thermophilum RIOK-2 protein kinase (Ct-RIOK-2) crystal structure 4GYG as a template...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821464/multi-elemental-nanoparticle-exposure-after-tantalum-component-failure-in-hip-arthroplasty-in-depth-analysis-of-a-single-case
#20
Janosch Schoon, Sven Geißler, Juliane Traeger, Andreas Luch, Jutta Tentschert, Giorgio Perino, Frank Schulze, Georg N Duda, Carsten Perka, Anastasia Rakow
Porous tantalum components are widely used for complex acetabular reconstructions in revision hip arthroplasty. Multiple other metal alloys such as titanium-aluminum-vanadium or cobalt-chromium-molybdenum are principally used in artificial joint setups. We report a case of tantalum component failure being both cause and effect of a multiple metal exposure. Our aims were to assess and to characterize associated particle exposure and biological consequences. Metal level quantification revealed substantial in vivo exposure to particulate and dissociated tantalum, zirconium, chromium, cobalt, molybdenum, titanium, aluminum and vanadium in periprosthetic compartments...
August 16, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
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