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heavy metal

Michael Sievers, Robin Hale, Stephen E Swearer, Kirsten M Parris
Global declines in amphibian populations are a significant conservation concern, and environmental contamination is likely a contributing driver. Although direct toxicity may be partly responsible, contaminants are often present at sub-lethal concentrations in the wild. Behavioural end-points are becoming an increasingly useful method to estimate the impact of contaminants, particularly if the behavioural responses manifest to affect individual fitness (i.e. survival, growth, or reproduction). In the wild, most animals are affected by multiple stressors, and determining how these interact to affect behaviour is critical for understanding the ecological implications of contaminant exposure...
June 14, 2018: Ecotoxicology and Environmental Safety
Yeon-Ok Kim, Hunseung Kang
To get insights into the functions of metallothionein (MT) in plant response to multiple stresses, expressions of 10 rice MT genes (OsMTs) and 7 Arabidopsis MT genes (AtMTs) were comprehensively analyzed under combined heavy metal and salt stress. OsMT1a, OsMT1b, OsMT1c, OsMT1g, and OsMT2a were increased by different heavy metals. Notably, ABA remarkably increased OsMT4 up to 80-fold. Combined salt and heavy metals (Cd, Pb, Cu) synergistically increased OsMT1a, OsMT1c, and OsMT1g, whereas combined salt and H2 O2 or ABA synergistically increased OsMT1a and OsMT4...
June 18, 2018: Bioscience, Biotechnology, and Biochemistry
Solomon Peter Wante, David W M Leung
Tagetes patula (marigold) and Petunia grandiflora (petunia) have been shown to exhibit potential in phytoremediation of environmental pollutants including heavy metals and textile dyes. To investigate their phytoremediation potential of diesel, it was necessary to evaluate diesel phytotoxicity of these two ornamental plants. Marigold and petunia seeds were incubated, for 10 and 15 days, respectively, in deionised water contaminated with 0 to 4%, v/v, diesel in Petri dishes in a growth room with continuous lighting at 25 °C...
June 17, 2018: Environmental Monitoring and Assessment
Anni Cao, Xueying Zhang, Bert Koopmans, Shouzhong Peng, Yu Zhang, Zilu Wang, Shaohua Yan, Hongxin Yang, Weisheng Zhao
The interfacial Dzyaloshinskii-Moriya interaction (DMI) in ferromagnetic/heavy metal ultra-thin film structures has attracted a lot of attention thanks to its capability to stabilize Néel-type domain walls (DWs) and magnetic skyrmions for the realization of non-volatile memory and logic devices. In this study, we demonstrate that magnetic properties in perpendicularly magnetized Ta/Pt/Co/MgO/Pt heterostructures, such as magnetization and DMI, can be significantly influenced by the MgO thickness. To avoid the excessive oxidation of Co, an ultrathin Mg layer is inserted to improve the quality of the Co-MgO interface...
June 18, 2018: Nanoscale
Selvi Asker, Muntecep Asker, Asli Cilingir Yeltekin, Mehmet Aslan, Bulent Ozbay, Halit Demir, Hakan Turan
Aim: The aim of the current study was to assess the serum levels of trace minerals/heavy metals in COPD patients with and without pulmonary hypertension (PH) and to investigate their correlations to demographic, clinical, and biochemical variables. Materials and methods: This cross-sectional study was performed in Van Yuzuncu Yil University Medical Faculty between April 2013 and July 2013. Cases were allocated into three groups: Group 1 consisted of severe COPD patients; Group 2 was made up of COPD patients with PH; and healthy controls constituted Group 3...
2018: International Journal of Chronic Obstructive Pulmonary Disease
Abhijit Ganguli, Pragya Rai, Sarala Balachandran, Rakesh Gupta, Rashmi Sharma, Sutapa Bandyopadhyay Neogi
Indigenous preparations (IPs) have evoked a considerable interest in alleviating infections and chronic diseases and improving wellbeing. While such formulations have been a part of traditional practice in several countries and many have been reviewed scientifically for their claims, several of them until date remain to be investigated. A class of IPs for sex selection by Indian pregnant women exists with an aim of begetting a male offspring. In view of the leads obtained from our previous studies on detrimental effects of the newborn, for instance stillbirths and congenital malformations, we attempted to investigate the samples for heavy metal toxicity...
June 16, 2018: Biological Trace Element Research
George Yaw Hadzi, David Kofi Essumang, Godwin A Ayoko
Heavy metal contamination of selected rivers in Ghana was studied as part of a bigger project aimed at setting background standard for heavy metals in the Ghanaian environment. Water samples were collected from major mining and eight pristine areas. The samples were acid digested with aqua-regia and analyzed with ICP-MS for As, Cd, Hg, Zn, Cu, Mn, Fe, Cr, Al, V, Co, Ni, and Pb. The average concentrations (mg/L) from the pristine sites ranged from 0.002 ± 0.00(As) to 0.929 ± 0.06 (Fe) and 0.002 ± 0...
June 16, 2018: Environmental Monitoring and Assessment
Junya Zhang, Min Yang, Hui Zhong, Mengmeng Liu, Qianwen Sui, Libing Zheng, Juan Tong, Yuansong Wei
The discrepant fate of antibiotic resistance genes (ARGs) in sludge and water phases was investigated in a municipal wastewater treatment plant, and a lab-scale A2 O-MBR was operated to provide background value of ARGs. The influencing factors of ARGs including microbial community, co-selection from heavy metals, biomass and horizontal gene transfer were concerned. Results showed that iA2 O (inversed A2 O) showed better ARGs reduction, and longer SRT (sludge retention time) increased ARGs relative abundance while reduced the gene copies of ARGs in the effluent, but significantly increased the ARGs in sludge phase...
June 9, 2018: Bioresource Technology
Qianqi Yang, Zhiyuan Li, Xiaoning Lu, Qiannan Duan, Lei Huang, Jun Bi
Soil heavy metal pollution has been becoming serious and widespread in China. To date, there are few studies assessing the nationwide soil heavy metal pollution induced by industrial and agricultural activities in China. This review obtained heavy metal concentrations in soils of 402 industrial sites and 1041 agricultural sites in China throughout the document retrieval. Based on the database, this review assessed soil heavy metal concentration and estimated the ecological and health risks on a national scale...
June 14, 2018: Science of the Total Environment
Xu Zhang, Min Li, Huanhuan Yang, Xinxin Li, Zhaojie Cui
The over discharge of mine tailing cause consequent heavy metal pollution. Phytoremediation as one of the most viable and efficient method for this problem has aroused much attention. In this research, the growth and physiological responses of Suaeda glauca and Arabidopsis thaliana plants were investigated, and the soil conditions (pH and enzyme activity) were evaluated further under varied levels of cadmium (Cd), lead (Pb) and manganese (Mn). The results showed that heavy metals could inhibit the growth of plants...
June 13, 2018: Journal of Environmental Management
Neelam A Vashi, Nicole Patzelt, Stephen Wirya, Mayra B C Maymone, Pedro Zancanaro, Roopal V Kundu
With globalization and widespread immigration, physicians increasingly encounter patients from varying backgrounds and diverse customs. Although certain cultural practices are widely performed, there is limited medical literature describing their dermatologic and systemic effects and complications. Population diversity and sharing of traditions make it increasingly important for dermatologists to understand the role of cultural practices and recognize physiologic and pathologic sequelae. In addition, dermatologists are often adjured to assess skin findings that may be mistaken for abuse...
July 2018: Journal of the American Academy of Dermatology
Yingjie Li, Wenfeng Li, Qingnan Liu, Hong Meng, Yingzhou Lu, Chunxi Li
For the first time, a series of alkynyl carbon materials (ACMs) were prepared via the mechanochemical reaction of CaC2 with six polyhalogenated precursors, namely CCl4 , C2 Cl6 , C2 Cl4 , C6 Cl6 , C6 Br6 , and C14 H4 Br10 (ACM-1, ACM-2, ACM-3, ACM-4, ACM-5, and ACM-6, respectively) and used for the adsorptive removal of mercury from aqueous solutions. Based on preliminary investigations, the adsorption of mercury on ACM-5 was studied in depth. Specifically, the effect of pH on mercury adsorptivity, adsorption kinetics, thermodynamics, isotherms, and recyclability was studied...
June 2018: Journal of Environmental Sciences (China)
Emily Hepburn, Anne Northway, Dawit Bekele, Gang-Jun Liu, Matthew Currell
Determining sources of heavy metals in soils, sediments and groundwater is important for understanding their fate and transport and mitigating human and environmental exposures. Artificially imported fill, natural sediments and groundwater from 240 ha of reclaimed land at Fishermans Bend in Australia, were analysed for heavy metals and other parameters to determine the relative contributions from different possible sources. Fishermans Bend is Australia's largest urban re-development project, however, complicated land-use history, geology, and multiple contamination sources pose challenges to successful re-development...
June 11, 2018: Environmental Pollution
Mihaela Badea, Octavio P Luzardo, Ana González-Antuña, Manuel Zumbado, Liliana Rogozea, Laura Floroian, Dana Alexandrescu, Marius Moga, Laura Gaman, Mariana Radoi, Luis D Boada, Luis Alberto Henríquez-Hernández
Smoking is considered an important source for inorganic elements, most of them toxic for human health. During the last years, there has been a significant increase in the use of e-cigarettes, although the role of them as source of inorganic elements has not been well established. A cross-sectional study including a total of 150 subjects from Brasov (Romania), divided into three groups (non-smokers, cigarette smokers and electronic cigarettes smokers) were recruited to disclose the role of smoking on the human exposure to inorganic elements...
June 13, 2018: Environmental Research
Hilary P Emerson, Silvina Di Pietro, Yelena Katsenovich, Jim Szecsody
Temporary base treatment is a potential remediation technique for heavy metals through adsorption, precipitation, and co-precipitation with minerals. Manipulation of pH with ammonia gas injection may be especially useful for vadose zone environments as it does not require addition of liquids that would increase the flux towards groundwater. In this research, we conducted laboratory batch experiments to evaluate the changes in uranium mobility and mineral dissolution with base treatments including sodium hydroxide, ammonium hydroxide, and ammonia gas...
June 13, 2018: Journal of Environmental Management
Annelie Gutsch, Els Keunen, Gea Guerriero, Jenny Renaut, Ann Cuypers, Jean-François Hausman, Kjell Sergeant
Cadmium (Cd) is a non-essential, toxic heavy metal that poses serious threats to both the ecosystem and the health of humans. Plants employ various cellular and molecular mechanisms to minimize the impact of Cd toxicity and the cell walls function as defensive barrier during Cd exposure. In this study, we adopted a quantitative gel-based proteomic approach (two-dimensional difference gel electrophoresis) to investigate changes in the abundance of cell wall- and soluble proteins in stems of Medicago sativa L...
June 15, 2018: Plant Biology
Veysel Turan, Shahbaz Ali Khan, Mahmood-Ur-Rahman, Muhammad Iqbal, Pia Muhammad Adnan Ramzani, Maryam Fatima
Depleting aquifers, lack of planning and low socioeconomic status of Pakistani farmers have led them to use wastewater (WW) for irrigating their crops causing food contamination with heavy metals and ultimately negative effects on human health. This study evaluates the effects of chitosan (CH) and biochar (BC) on growth and nutritional quality of brinjal plant together with in situ immobilization of heavy metals in a soil polluted with heavy metals due to irrigation with wastewater (SPHIW) and further irrigated with the same WW...
June 12, 2018: Ecotoxicology and Environmental Safety
Navish Kataria, V K Garg
This study focused on the synthesis and characterization of novel magnetic iron oxide nanoparticles loaded sawdust carbon (Fe3 O4 /SC) and EDTA modified Fe3 O4 /SC (EDTA@Fe3 O4 /SC) nanocomposites (ncs) by low cost biogenic green synthesis approach and their application for Cd (II) removal from aqueous medium in batch mode. In isotherm studies, Langmuir and Freundlich models are best fitted to Cd (II) removal data. Langmuir maximum adsorption capacity of EDTA@Fe3 O4 /SC ncs was found to be 63.3, 22.4 and 25 mg/g that is greater than maximum adsorption capacity of Fe3 O4 /SC ncs that is 51, 18...
June 4, 2018: Chemosphere
Philip Isaac Omwene, Mehmet Salim Öncel, Meltem Çelen, Mehmet Kobya
Mining activities in addition to the geology of Mustafakemalpaşa catchment have for long been linked to its deteriorating water and sediment quality. This study assessed contamination levels of heavy metals and other major elements (Pb, As, B, Cd, Zn, Cr, Mo, Co, Ni, Cu, and Ag) in surface sediments of the area, and identified possible pollution sources. Sediment quality indicators, such as contamination factor (CF), enrichment factor (EF), geo-accumulation index (Igeo ) and sediment quality guidelines were used, in addition to multivariate statistical technics; Pearson Correlation Matrix (PCM), Principal Component Analysis (PCA) and Hierarchical Cluster Analysis (HCA)...
June 7, 2018: Chemosphere
Woosik Shin, Sungwook Choung, Weon Shik Han, Jeonghwan Hwang, Gyeongmin Kang
Although soil contamination must be remediated by the polluters under current legal frameworks in numerous countries, the allocation of responsibilities for soil clean-up is still challenging in the case of multiple potentially responsible parties (PRPs). This study evaluated the individual contributions of two PRPs (Owners A & B) to heavy metal contamination in the soil environment near an abandoned smelter and compared the results with those from the conventional Gore Factor (GF) method. The soil in the study area was widely contaminated by various heavy metals...
June 12, 2018: Science of the Total Environment
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