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https://www.readbyqxmd.com/read/30244275/remediation-of-toxic-metal-contaminated-sediment-using-three-types-of-nzvi-supported-materials
#1
D Tomašević Pilipović, Dj Kerkez, B Dalmacija, N Slijepčević, D Krčmar, D Rađenović, M Bečelić-Tomin
Due to nZVI effectiveness in the removal of toxic metals as well as low-cost regarding its production, kaolinite, bentonite and carboxymethyl cellulose supported nZVI were chosen for in-situ remediation of river sediment. Small-scale laboratory studies have shown that the percentage of removed metal (Ni, Zn and Pb) ranged up to 80% depending on the nanomaterial used. The metal mobility in sediments was investigated using single extraction, which is proved to be better for quick estimation of metal mobility, and for highly contaminated sites both single and sequential extraction needs to be used...
September 22, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/30243875/experimental-study-of-the-effects-of-soil-ph-and-ionic-species-on-the-electro-osmotic-consolidation-of-kaolin
#2
Liming Hu, Lin Zhang, Hui Wu
The application of an electric field on soil mass induces both electro-osmotic flow and electro-migration, which has been used for the dewatering of soft soils and remediation of contaminated soils. The physical and chemical properties of soft soils are influenced by the soil pH as well as ionic species and their concentrations, which subsequently influence the dewatering and remediation efficiency. In the present study, one-dimensional column experiments were conducted to investigate the influence of soil pH and ionic species on the electro-osmotic consolidation process of kaolin...
September 6, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30243255/immobilization-of-laccase-on-hollow-mesoporous-carbon-nanospheres-noteworthy-immobilization-excellent-stability-and-efficacious-for-antibiotic-contaminants-removal
#3
Binbin Shao, Zhifeng Liu, Guangming Zeng, Yang Liu, Xin Yang, Chengyun Zhou, Ming Chen, Yujie Liu, Yilin Jiang, Ming Yan
In this study, the hollow mesoporous carbon spheres (HMCs) were synthesized and modified for laccase (Lac) immobilization, and the structural characteristics of HMCs materials were determined by FESEM, TEM and FTIR etc. The maximum loading of Lac on the HMCs materials could reach 835 mg/g, meanwhile, the immobilized Lac exhibited excellent thermo-stability, pH stability, storage stability and reusability. The antibiotics removal experiments indicated that the immobilized Lac possess efficient removal efficiency for both tetracycline hydrochloride (TCH) and ciprofloxacin hydrochloride (CPH) in the presence of redox mediator...
September 14, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30243254/screening-of-wheat-straw-biochars-for-the-remediation-of-soils-polluted-with-zn-ii-and-cd-ii
#4
Ting-Ting Qian, Ping Wu, Qiu-Ying Qin, Ying-Nan Huang, Yu-Jun Wang, Dong-Mei Zhou
The immobilization behaviors of Zn(II) and Cd(II) by wheat straw (WS) biochars could vary with the soil conditions. In the acidic environment, WS biochars produced at low temperature were more competent than those produced at high temperature on Zn(II) and Cd(II) immobilization; while WS biochars produced at high temperature were more effective than those produced at low temperature in the alkaline environment. The ions in the porewater could compromise the sorption capacities of Zn(II) and Cd(II) by WS biochars in acidic soils, while could enhance them in alkaline soils...
September 13, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30243177/in-situ-deposition-of-gold-nanoparticles-onto-polydopamine-decorated-g-c-3-n-4-for-highly-efficient-reduction-of-nitroaromatics-in-environmental-water-purification
#5
Lei Qin, Danlian Huang, Piao Xu, Guangming Zeng, Cui Lai, Yukui Fu, Huan Yi, Bisheng Li, Chen Zhang, Min Cheng, Chengyun Zhou, Xiaofeng Wen
A green synthesized gold-catalyst (PDA-g-C3 N4 /Au) for highly efficient reduction of nitroaromatics by NaBH4 was proposed. Polydopamine (PDA) served as the reductant and stabilizer for AuNPs reduction, avoiding the use of chemical reductant and stabilizer that may result in secondary contamination. g-C3 N4 not only acted as the support but also provided compatibility for AuNPs deposition, enhancing the stability and deposition of AuNPs, which improved the catalytic activity. Different experimental parameters including the amount of Au loading, concentration of NaBH4 , and dosage of catalyst were studied...
September 17, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30242673/determination-of-synthetic-pharmaceutical-adulterants-in-herbal-weight-gain-supplements-sold-in-herb-shops-tehran-iran
#6
Niosha Saberi, Maryam Akhgari, Leila Bahmanabadi, Elham Bazmi, Zahra Mousavi
BACKGROUND: Nowadays with the growing popularity of herbal remedies across the world, large sections of population rely on herbal drug practitioners for their primary care. Therefore there is a need to ensure about the safety of herbal drugs and to detect adulteration with undeclared active pharmaceutical ingredients. Herbal drugs are used as first-line drug therapy in some instances. Unfortunately even if there are claims as to be natural, undeclared active pharmaceutical ingredients have been detected in these supplements...
September 21, 2018: Daru: Journal of Faculty of Pharmacy, Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30242654/determination-of-the-phytoremediation-efficiency-of-ricinus-communis-l-and-methane-uptake-from-cadmium-and-nickel-contaminated-soil-using-spent-mushroom-substrate
#7
Yiqi Sun, Chengfeng Wen, Xia Liang, Chiquan He
Spent mushroom substrate (SMS) as an organic amendment to plant production has received increasing attention on soil phytoremediation. However, organic amendments are known to contribute to greenhouse gas (GHG) emission from soils. Castor oil plant has a high biomass production and phytoremediation potential for heavy metal-contaminated soils. In the present study, the roles of SMS on phytoremediation efficiency of castor oil plant (Ricinus communis L.) from cadmium (Cd) and nickel (Ni)-contaminated soils were investigated, and the impact of SMS application on methane emission from the contaminated soil were evaluated...
September 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30242649/immobilization-of-heavy-metals-in-two-contaminated-soils-using-a-modified-magnesium-silicate-stabilizer
#8
Xingzhong Yuan, Ting Xiong, Hou Wang, Zhibin Wu, Longbo Jiang, Guangming Zeng, Yue Li
Heavy metal contamination is a severe environmental issue over the world. A lot of work has been done to develop effective stabilizers. In the present work, hydrothermal carbon-modified magnesium silicate (MS-C) was synthesized and used for the remediation of two heavy metal-polluted soils with different physicochemical properties. Soil samples were exposed to different doses of MS-C over 60 days (1, 3, and 5 wt%). The toxicity characteristic leaching procedure (TCLP) and the community bureau of reference sequential extraction procedure (BCR) were used to evaluate the remediation efficiency...
September 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30242262/ancient-and-modern-anticonvulsants-act-synergistically-in-a-kcnq-potassium-channel-binding-pocket
#9
Rían W Manville, Geoffrey W Abbott
Epilepsy has been treated for centuries with herbal remedies, including leaves of the African shrub Mallotus oppositifolius, yet the underlying molecular mechanisms have remained unclear. Voltage-gated potassium channel isoforms KCNQ2-5, predominantly KCNQ2/3 heteromers, underlie the neuronal M-current, which suppresses neuronal excitability, protecting against seizures. Here, in silico docking, mutagenesis and cellular electrophysiology reveal that two components of M. oppositifolius leaf extract, mallotoxin (MTX) and isovaleric acid (IVA), act synergistically to open neuronal KCNQs, including KCNQ2/3 channels...
September 21, 2018: Nature Communications
https://www.readbyqxmd.com/read/30241081/carbon-and-nitrogen-stable-isotope-fractionation-during-abiotic-hydrolysis-of-pesticides
#10
Jérémy Masbou, Guillaume Drouin, Sylvain Payraudeau, Gwenaël Imfeld
Compound-specific Stable Isotope Analysis (CSIA) has been recently established as a tool to study pesticide degradation in the environment. Among degradative processes, hydrolysis is environmentally relevant as it can be chemically or enzymatically mediated. Here, CSIA was used to examine stable carbon and nitrogen isotope fractionation during abiotic hydrolysis of legacy or currently used pesticides (chloroacetanilide herbicides: Acetochlor, Alachlor, S-Metolachlor and Butachlor, acylalanine fungicide: Metalaxyl, and triazine herbicide: Atrazine)...
September 10, 2018: Chemosphere
https://www.readbyqxmd.com/read/30241079/aging-effects-on-the-mobility-of-pb-in-soil-influence-on-the-energy-requirements-in-electroremediation
#11
Maria Villen-Guzman, Ana Garcia-Rubio, Juan M Paz-Garcia, Carlos Vereda-Alonso, Cesar Gomez-Lahoz, Jose M Rodriguez-Maroto
This paper studies the possible differences in the behavior of lead as a contaminant in soil samples when it is present as "naturally-aged" for decades after the contamination, and when it has been spiked in the laboratory. This behavior differences are stablished mainly in two ways: as changes in the fractionation analysis obtained after a sequential extraction procedure (SEP) and as changes in the efficiency of the acid-enhanced electroremediation (EKR) technique. Additionally, aging effects have been studied for almost five years...
September 7, 2018: Chemosphere
https://www.readbyqxmd.com/read/30240998/removal-of-micropollutants-from-water-in-a-continuous-flow-electrical-discharge-reactor
#12
Niels Wardenier, Patrick Vanraes, Anton Nikiforov, Stijn W H Van Hulle, Christophe Leys
The emergence of micropollutants into our aquatic resources is regarded as an issue of increasing environmental concern. To protect the aquatic environment against further contamination with micropollutants, treatment with advanced oxidation processes (AOPs) is put forward as a promising technique. In this work, an innovative AOP based on electrical discharges in a continuous-flow pulsed dielectric barrier discharge (DBD) reactor with falling water film over activated carbon textile is examined for its potential application in water treatment...
August 30, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30240920/long-term-and-inter-monthly-dynamics-of-aquatic-vegetation-and-its-relation-with-environmental-factors-in-taihu-lake-china
#13
Shuangshuang Wang, Yongnian Gao, Qin Li, Junfeng Gao, Shuhua Zhai, Ya Zhou, Yuanhua Cheng
This paper discussed the long-term and inter-monthly variation in the distribution area of aquatic macrophytes in Taihu Lake, as well as the relationship between these variations and environmental factors. The findings were of great significance to the protection and environmental remediation of lake ecosystems. This paper presented data from 92 periods during 1980 to 2017 on the distribution area of aquatic macrophytes (including submerged macrophytes and floating-leaved macrophytes, but excluding emergent macrophytes) in Taihu Lake...
September 18, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30240743/piezoelectrically-enhanced-photocatalysis-with-bifeo-3-nanostructures-for-efficient-water-remediation
#14
Fajer Mushtaq, Xiangzhong Chen, Marcus Hoop, Harun Torlakcik, Eva Pellicer, Jordi Sort, Chiara Gattinoni, Bradley J Nelson, Salvador Pané
Designing new catalysts that can efficiently utilize multiple energy sources can contribute to solving the current challenges of environmental remediation and increasing energy demands. In this work, we fabricated single-crystalline BiFeO3 (BFO) nanosheets and nanowires that can successfully harness visible light and mechanical vibrations and utilize them for degradation of organic pollutants. Under visible light both BFO nanostructures displayed a relatively slow reaction rate. However, under piezocatalysis both nanosheets and nanowires exhibited higher reaction rates in comparison with photocatalytic degradation...
June 29, 2018: iScience
https://www.readbyqxmd.com/read/30239566/rnapuzzler-efficient-outerplanar-drawing-of-rna-secondary-structures
#15
Daniel Wiegreffe, Daniel Alexander, Peter F Stadler, Dirk Zeckzer
Motivation: RNA secondary structure is a useful representation for studying the function of RNA, which captures most of the free energy of RNA folding. Using empirically determined energy parameters, secondary structures of nucleic acids can be efficiently computed by recursive algorithms. Several software packages supporting this task are readily available. As RNA secondary structures are outerplanar graphs, they can be drawn without intersection in the plane. Interpretation by the practitioner is eased when these drawings conform to a series of additional constraints beyond outerplanarity...
September 19, 2018: Bioinformatics
https://www.readbyqxmd.com/read/30239452/functional-basis-of-asymmetrical-lower-body-skeletal-morphology-in-professional-australian-rules-footballers
#16
Nicolas H Hart, Robert U Newton, Jason Weber, Tania Spiteri, Timo Rantalainen, Michael Dobbin, Paola Chivers, Sophia Nimphius
Hart, NH, Newton, RU, Weber, J, Spiteri, T, Rantalainen, T, Dobbin, M, Chivers, P, and Nimphius, S. Functional basis of asymmetrical lower-body skeletal morphology in elite Australian footballers. J Strength Cond Res XX(X): 000-000, 2018-Bone strength is a product of its material and structural properties and is highly responsive to mechanical load. Given the measureable and adaptable features of bone, and thus relevance to medical screening, injury prevention, and injury management in athletes, this study describes the lower-body skeletal morphology of professional Australian rules footballers...
September 19, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/30237638/integrated-hydrological-and-geophysical-characterisation-of-surface-and-subsurface-water-contamination-at-abandoned-metal-mines
#17
Emily Hudson, Bernd Kulessa, Paul Edwards, Tom Williams, Rory Walsh
The mining and processing of metal ores in the UK has left a legacy of environmental degradation, and abandoned metal mines still pose a significant threat to terrestrial and fluvial environments. Flow gauging, water quality and geophysics were combined in an integrated assessment of surface and subsurface hydrological contamination at Esgair Mwyn, an abandoned mine in Ceredigion, Wales. Heavy metals discharged from the site are polluting downstream watercourses, leading to widespread Environmental Quality Standards (EQS) compliance failures...
2018: Water, Air, and Soil Pollution
https://www.readbyqxmd.com/read/30237122/-it-just-happens-care-home-residents-experiences-and-expectations-of-accessing-gp-care
#18
Christina Victor, Susan Davies, Angela Dickinson, Hazel Morbey, Helen Masey, Heather Gage, Katherine Froggatt, Steve Iliffe, Claire Goodman
BACKGROUND: Care homes provide personal care and support for older people who can no longer be supported in the community. As part of a larger study of integrated working between the NHS and care homes we asked older people how they accessed health care services. Our aim was to understand how older people resident in care homes access health services using the Andersen model of health care access. METHODS: Case studies were conducted in six care homes with different socio-economic characteristics, size and ownership in three study sites...
August 13, 2018: Archives of Gerontology and Geriatrics
https://www.readbyqxmd.com/read/30236963/neurotherapeutic-capacity-of-p7c3-agents-for-the-treatment-of-traumatic-brain-injury
#19
REVIEW
Meghan O Blaya, Joseph M Wasserman, Andrew A Pieper, Thomas J Sick, Helen M Bramlett, W Dalton Dietrich
Traumatic brain injury (TBI) is a significant public health problem around the world. A promising area of research is the characterization of small, drug-like molecules that have potent clinical properties. One pharmacotherapeutic agent in particular, an aminopropyl carbazole called P7C3, was discovered using an in vivo screen to identify new agents that augmented the net magnitude of adult hippocampal neurogenesis. P7C3 greatly enhanced neurogenesis by virtue of increasing survival rates of immature neurons...
September 17, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/30236944/enhanced-surface-decontamination-of-radioactive-cs-by-self-generated-strippable-hydrogels-based-on-reversible-cross-linking
#20
Hee-Man Yang, Chan Woo Park, Kune-Woo Lee
A self-generated, strippable hydrogel containing adsorbents was developed to remove the radioactive cesium from surfaces by adsorption for wide-area surface decontamination. Two aqueous polymeric solutions of polyvinyl alcohol (PVA) and phenylboronic-acid-grafted alginate (PBA-Alg) were easily applied to surfaces and subsequently self-generated a hydrogel based on the PBA-diol ester bond. Compared to the strippable coating and chemical gels, the PBA-diol ester bond-based hydrogel was easily peeled off the surfaces without a drying step due to its high elasticity, which is more practical and time saving...
September 11, 2018: Journal of Hazardous Materials
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