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Metal Heavy

Esra Nurten Yer, Mehmet Cengiz Baloglu, Sezgin Ayan
Heat shock proteins (Hsps) play a key role for regulation of the changes during different stress conditions including salinity, drought, heavy metal and extreme temperature. Molecular based studies on the response mechanisms of forest trees to abiotic stresses started in 2006 when Populus trichocarpa genome sequence was completed as a model tree species. In recent years, bioinformatic analyzes have been carried out to determine functional gene regions of tree species. In this study, sHsp, Hsp40, Hsp60, Hsp90 and Hsp100 gene family members were identified in poplar genome...
August 12, 2018: Gene
Youning Chen, Wei Zhao, Huan Wang, Xiaohua Meng, Linjie Zhang
A novel polyamine-type starch/glycidyl methacrylate (GMA) copolymer with a high capacity for the adsorption of heavy metal ions was prepared via graft copolymerization of GMA and corn starch and a subsequent amination reaction between amino group of diethylenetriamine and epoxy group in GMA. The copolymers were characterized by Fourier transform infrared spectrometry, X-ray diffraction and scanning electron microscopy, and adsorption properties on modified starch of Cu(II), Pb(II), Cd(II) and Cr(III) were studied...
June 2018: Royal Society Open Science
V Vijaya Kumar, C Ramesh Kumar, A Suresh, S Jayalakshmi, U Kamachi Mudali, N Sivaraman
Four types of polybenzimidazole (PBI)-based polymers ( m -PBI, p -PBI, pyridine-based m -PBI and alkylated m -PBI) have been prepared and characterized. Extraction behaviour of heavy metal ions, viz. U(VI), Th(IV) and Pd(II), with these polymers was investigated. Distribution ratios for the extraction of these metal ions were measured as a function of nitric acid concentration. Extraction data reveal that, in general, p -PBI exhibits a higher distribution ratio for U(VI), Th(IV) and Pd(II) compared with the other polymeric resins evaluated in the present study...
June 2018: Royal Society Open Science
Mengmeng Guan, Lei Wang, Shishun Zhao, Ziyao Zhou, Guohua Dong, Wei Su, Tai Min, Jing Ma, Zhongqiang Hu, Wei Ren, Zuo-Guang Ye, Ce-Wen Nan, Ming Liu
The voltage modulation of yttrium iron garnet (YIG) is of practical and theoretical significance; due to its advantages of compactness, high-speed response, and energy efficiency, it can be used for various spintronic applications, including spin-Hall, spin-pumping, and spin-Seebeck effects. In this study, a significant ferromagnetic resonance change is achieved within the YIG/Pt bilayer heterostructures uisng ionic modulation, which is accomplished by modifying the interfacial magnetism in the deposited "capping" platinum layer...
August 14, 2018: Advanced Materials
Juan Zhan, Tingxuan Li, Haiying Yu, Xizhou Zhang
Interactions between heavy metals in soil could affect soil heavy metal availability and plant uptake. Thus, in this study, Cd and Pb accumulation as well as plant growth of the mining ecotype (ME) and non-mining ecotype (NME) of Athyrium wardii (Hook.) in response to the exposure of Cd and Pb was investigated by a pot experiment. Although the exposure of Cd in combination with Pb further inhibited the growth of the two ecotypes in comparison with the exposure of single Cd or Pb, the ME presented lower biomass decline for the whole plant (22...
August 14, 2018: Environmental Science and Pollution Research International
Fozia Aslam, Azra Yasmin, Torsten Thomas
Stenotrophomonas MB339, a bacterium, which could potentially utilize aromatic compounds and tolerate different heavy metals was isolated from industrial wastewater. Subsequent experiments revealed strains ability to resist antibiotics ofloxacin, streptomycin, rifampicillin, erythromycin, ampicillin, clindamycin, and toxicants including As2+ , Hg2+ , Cu2+ , Ni2+ , Pb2+ . The shotgun sequencing strategy, genome assembly and annotation uncovered specific features, which make this strain MB339 effectively promising to cope with highly contaminated conditions...
August 14, 2018: Current Microbiology
Olugbemi Tope Olaniyan, Olufadekemi Tolulope Kunle-Alabi, Yinusa Raji
OBJECTIVES: Male infertility caused by exposure to heavy metals is a current global issue. Exposure to cadmium chloride (CdCl2 ) negatively affects the male reproductive system. Many infertile people, especially in developing countries, resort to folkloric treatment. Plukenetia conophora is used in Nigerian folk medicine to promote fertility. This study investigated the effects of Plukenetia conophora (PC) and 4H-Pyran-4-One 2,3-Dihydro-3,5-Dihydroxy-6-Methyl (DDMP) on Wistar rats with cadmium chloride-induced testicular damage...
August 14, 2018: JBRA Assisted Reproduction
Wenling Ye, Guifeng Guo, Fan Wu, Ting Fan, Hongjuan Lu, Haiyan Chen, Xuede Li, Youhua Ma
Cadmium (Cd) is considered to be the most phytotoxic heavy metal pollutant. The selection of castor bean cultivars with Cd tolerance and the exploration of the physiological mechanisms involved in Cd tolerance are critical steps for improving phytoremediation performance. In this study, a hydroponic experiment was used to investigate variations in Cd transportation, chelation, and subcellular distribution in two different castor bean cultivars, namely JX-22 and ZB-9. Both cultivars had high tolerance index scores, indicating that both cultivars were tolerant to Cd...
August 13, 2018: Environmental Science and Pollution Research International
Golayeh Yousefi, Mehdi Homaee, Ali Akbar Norouzi
This study was aimed (i) to examine using diffuse reflectance spectra within VNIR region to estimate soil heavy metals concentrations at large scale, (ii) to compare the influence of different pre-processing models on predictive model accuracy, and (iii) to explore the best predictive models. A number of 325 topsoil samples were collected and their spectral data, pH, clay content, organic matter, Ni, and Cu concentrations were determined. To improve spectral data, various pre-processing methods including Savitzky-Golay smoothing filter, Savitzky-Golay smoothing filter with first and second derivatives, and standard normal variant (SNV) were used...
August 13, 2018: Environmental Monitoring and Assessment
Sungjin Kim, Anuj K Sharma, Olena K Vatamaniuk
The chronic exposure of humans to toxic metals such as cadmium from food and air causes dysfunction of vital organs, neurodegenerative conditions, and cancer. In this regard, members of the ABCB sub-family of the ATP-binding cassette (ABC) transporter superfamily, ABCB6/HMT-1, are acutely required for the detoxification of heavy metals and are present in genomes of many organisms including the nematode worm, Caenorhabditis elegans and humans. We showed previously that C. elegans ABCB6/HMT-1 detoxifies cadmium, copper, and arsenic, and is expressed in liver-like cells, the coelomocytes, head neurons and intestinal cells, which are the cell types that are affected by heavy metal poisoning in humans...
2018: Frontiers in Physiology
Peixin Wang, Xiaojie Hu, Qianjia He, Michael Gatheru Waigi, Jian Wang, Wanting Ling
Co-contaminated soils containing heavy metals and polycyclic aromatic hydrocarbons (PAHs) are an environmental and human health risk. Research into the remediation of these soils is imperative. In this paper, a novel investigation utilizing calcination technique to stabilize heavy metals and simultaneously remove PAHs in soil was conducted. Calcination temperature (300⁻700 °C) was observed to play a dominant role in heavy metal stabilization and PAH removal in soils. However, calcination time (0.5⁻8 h) had no significant effect on these contaminants during calcination at different temperatures...
August 13, 2018: International Journal of Environmental Research and Public Health
Massimo Malerba, Raffaella Cerana
High temperatures are a significant stress factor for plants. In fact, many biochemical reactions involved in growth and development are sensitive to temperature. In particular, heat stress (HS) represents a severe issue for plant productivity and strategies to obtain high yields under this condition are important goals in agriculture. While selenium (Se) is a nutrient for humans and animals, its role as a plant micronutrient is still questioned. Se can prevent several abiotic stresses (drought, heat, UV, salinity, heavy metals), but the action mechanisms are poorly understood...
August 11, 2018: Plants (Basel, Switzerland)
Naixiao Wang, Xilin Wang, Ping Chen, Zhidong Jia, Liming Wang, Ronghui Huang, Qishen Lv
The fast detection of classical contaminants and their distribution on high-voltage transmission line insulators is essential for ensuring the safe operation of the power grid. The analysis of existing insulator contamination has traditionally relied on taking samples during a power cut, taking the samples back to the lab and then testing them with elemental analysis equipment, especially for sugars, bird droppings, and heavy metal particulates, which cannot be analysed by the equivalent salt deposit density (ESDD) or non-soluble deposit density (NSDD) methods...
August 10, 2018: Sensors
Yinka Titilawo, Abiodun Adeniji, Mobolaji Adeniyi, Anthony Okoh
This study evaluated levels of heavy metals and macro-elements in ten major rivers in Osun State, Southwest Nigeria. Triplicate water samples collected from selected rivers were analyzed for metal pollutants by atomic absorption spectrophotometry. Concentrations were obtained as follows: iron: 60-960 μg L-1 ; manganese: ND - 3 μg L-1 ; chromium 0-2100 μg L-1 ; aluminium: 0-800 μg L-1 ; copper: 0-1350 μg L-1 ; zinc: 10-650 μg L-1 ; calcium: 6400-232000 μg L-1 and magnesium: 2000-71000 μg L-1 but lead was not detected...
August 1, 2018: Chemosphere
Junhao Sun, Yan Chen, Haiqin Yu, Liangguo Yan, Bin Du, Zhiguo Pei
In this work, the magnetic alginate microsphere of Fe3 O4 /MgAl-LDH (Fe3 O4 /LDH-AM) was prepared by immobilizing the Fe3 O4 /LDH with calcium alginate (CA) and was used to remove Cd2+ , Pb2+ , and Cu2+ from aqueous solutions. The obtained Fe3 O4 /LDH-AM was characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, X-ray photoelectron spectroscopy, and Brunauer-Emmett-Teller surface area determination. The results indicated that the surface groups of the alginate and LDH were retained and so was the crystal structure in the alginate microsphere...
July 31, 2018: Journal of Colloid and Interface Science
József Lehel, András Bartha, Dávid Dankó, Katalin Lányi, Péter Laczay
Heavy-metal content (arsenic, cadmium, lead and mercury) was investigated and evaluated in shellfish, oysters and squids. The samples were collected weekly for 20 weeks from a fishery product market in Hungary. The concentration of heavy metals was measured by Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES) analysis after sample preparation. The results were analysed statistically by one-way ANOVA method. The average concentration of arsenic (3.01 ± 1.46 mg kg-1 ) in shellfish was significantly higher (p < 0...
August 13, 2018: Food Additives & Contaminants. Part B, Surveillance
Ahmed Hamdy, Mohamed K Mostafa, Mahmoud Nasr
Nanoscale zero-valent iron (nZVI) particles were investigated for the removal of methylene blue (MB) from aqueous solutions and the treatment of textile industry effluents. The nZVI material was characterized by XRD, TEM, EDS, FTIR, and SEM. It was demonstrated that several functional groups such as C-H, C = C, C-C, and C-O contributed to MB reduction. At initial MB concentration of 70 mg/L, the optimum pH was 6, achieving a removal efficiency of 72.1% using an nZVI dosage of 10 g/L, stirring rate of 150 rpm, and temperature of 30 °C within 30 min...
August 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Xueyong Zhou, Hang Li, Daying Liu, Jianchao Hao, Huifen Liu, Xianzhi Lu
Bt crops have been widely commercialized for cultivation in the world, but as yet, the effects of Bt toxin on sorption of heavy metals in soils has not been reported. In this study, the effects of toxin from Bacillus thuringiensis on Pb (II) sorption by red (Ultisol) and black soil (Vertisol) were studied using the batch method. The results showed that Pb(II) sorption by both soil types decreased in the presence of Bt toxin from 0 to 10 mg/L, which was probably due to the sorptive sites competition and Pb-toxin complex formation...
August 2, 2018: Journal of Hazardous Materials
Ya-Li Zhou, Su-Fang Huo, Li-Ting Wang, Jiang-Fei Meng, Zhen-Wen Zhang, Zhu-Mei Xi
Copper (Cu) stress is the most common abiotic stress experienced in vineyards owing to the copper-based fungicides application. Plant hormones, including 24-Epibrassinolide (EBR), may alleviate the adverse impacts of heavy metal stress on plants. We investigated the effects of EBR pretreatment on root morphological parameters, active oxygen metabolism, osmolytes contents, antioxidant enzyme activity, endogenous phytohormone contents, and ascorbate-glutathione (AsA-GSH) cycle activity of one-year-old grape (Vitis vinifera L...
July 26, 2018: Plant Physiology and Biochemistry: PPB
Taoran Shi, Jin Ma, Xiao Wu, Tienan Ju, Xianglong Lin, Yunyun Zhang, Xinhong Li, Yiwei Gong, Hong Hou, Long Zhao, Fuyong Wu
Heavy metal pollution of agricultural soils is an important issue around the world. To understand the overall pollution process, accurate determination of every input and output pathway of heavy metals to and from soils is essential. Hence, input and output inventory, a quantitative analysis method of heavy metals balance in agricultural soils, has been widely used. However, due to differences in geography, climate, socioeconomic factors, industrial and agricultural production, substantial variation exists among existing input and output inventories for different countries and regions...
August 9, 2018: Ecotoxicology and Environmental Safety
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