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https://www.readbyqxmd.com/read/29785604/cadmium-phytoextraction-potential-of-king-grass-pennisetum-sinese-roxb-and-responses-of-rhizosphere-bacterial-communities-to-a-cadmium-pollution-gradient
#1
Li Hu, Ru Wang, Xianglin Liu, Bo Xu, Tuanhui Xie, Yunyun Li, Mingkuang Wang, Guo Wang, Yanhui Chen
Screening for tolerant and high biomass producing plants is important for phytoextraction efforts in remediating agricultural soils contaminated by heavy metals. We carried out a greenhouse experiment involving a soil cadmium (Cd) concentration gradient (0.1, 0.5, 1, 2, 4, and 8 mg kg-1 ) to assess growth and phytoextraction capacity of king grass (Pennisetum sinese Roxb.) in soils contaminated by Cd and to explore changes in diversity and structure of rhizosphere soil bacterial communities in response to long-term Cd pollution...
May 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29785603/trace-and-macro-elements-in-the-femoral-bone-as-indicators-of-long-term-environmental-exposure-to-toxic-metals-in-european-brown-bear-ursus-arctos-from-croatia
#2
Maja Lazarus, Tatjana Orct, Slaven Reljić, Marija Sedak, Nina Bilandžić, Jasna Jurasović, Đuro Huber
We explored the long-term accumulation of aluminium, strontium, cadmium and lead in the compact and trabecular bone of the femoral epiphysis, metaphysis and diaphysis in 41 brown bears (Ursus arctos) from Croatia. Also, we assessed their influence on macro and trace elements (sodium, magnesium, phosphorus, potassium, calcium, manganese, iron, cobalt, copper, zinc and barium) in bears' bone. There were no sex differences in element levels in general, while age was associated with bone length and levels of all elements, except for cadmium...
May 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29785602/feasibility-study-of-cadmium-adsorption-by-palm-oil-fuel-ash-pofa-based-low-cost-hollow-fibre-zeolitic-membrane
#3
Mohamad Sukri Mohamad Yusof, Mohd Hafiz Dzarfan Othman, Azeman Mustafa, Mukhlis Abdul Rahman, Juhana Jaafar, Ahmad Fauzi Ismail
Palm oil fuel ash (POFA) is an agricultural waste which was employed in this study to produce novel adsorptive ceramic hollow fibre membranes. The membranes were fabricated using phase inversion-based extrusion technique and sintered at 1150 °C. The membranes were then evaluated on their ability to adsorb cadmium (Cd(II)). These membranes were characterised using (nitrogen) N2 adsorption-desorption analysis, field emission scanning electron microscopy-energy-dispersive X-ray spectroscopy (FESEM-EDX) mapping, X-ray fluorescence (XRF), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) analyses while adsorptivity activity was examined by batch adsorption studies...
May 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29784360/determination-of-cadmium-in-sediments-by-diluted-hci-extraction-and-isotope-dilution-icp-ms
#4
Javier Terán-Baamonde, Rosa-María Soto-Ferreiro, Alatzne Carlosena, José-Manuel Andrade, Darío Prada
Isotope dilution ICP-MS is proposed to measure the mass fraction of Cd extracted by diluted HCl in marine sediments, using a fast and simple extraction procedure based on ultrasonic probe agitation. The 111 Cd isotope was added before the extraction to achieve isotope equilibration with native Cd solubilized from the sample. The parameters affecting trueness and precision of isotope ratio measurements were evaluated carefully and subsequently corrected in order to minimize errors; they were: detector dead time, spectral interferences, mass discrimination factor and optimum sample/spike ratio...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29783652/pituitary-gonadal-thyroid-hormones-and-endocrine-disruptors-in-pre-and-postmenopausal-nigerian-women-with-er-pr-and-her-2-positive-and-negative-breast-cancers
#5
Olulope Ajayi, Mabel Charles-Davies, John Anetor, Adeyinka Ademola
Breast cancer is broadly sub-divided into hormone responsive and non-hormone responsive subtypes. Estradiol has been associated with hormone responsive breast cancers. There is, however, a paucity of information on the role of sex hormones, gonadotropins, and thyroid hormone in non-hormone responsive breast cancer. This study aimed to determine differences in the serum levels of sex hormones, gonadotropins, thyroid hormones, and endocrine disruptors (lead, cadmium, and arsenic) in Nigerian women with hormone responsive and non-hormone responsive breast cancers...
May 18, 2018: Medical Sciences: Open Access Journal
https://www.readbyqxmd.com/read/29783644/a-model-for-remote-depth-estimation-of-buried-radioactive-wastes-using-cdznte-detector
#6
Ikechukwu Kevin Ukaegbu, Kelum A A Gamage
This paper presents the results of an attenuation model for remote depth estimation of buried radioactive wastes using a Cadmium Zinc Telluride (CZT) detector. Previous research using an organic liquid scintillator detector system showed that the model is able to estimate the depth of a 329-kBq Cs-137 radioactive source buried up to 12 cm in sand with an average count rate of 100 cps. The results presented in this paper showed that the use of the CZT detector extended the maximum detectable depth of the same radioactive source to 18 cm in sand with a significantly lower average count rate of 14 cps...
May 18, 2018: Sensors
https://www.readbyqxmd.com/read/29783200/blood-lead-and-cadmium-levels-in-preschool-children-and-associated-risk-factors-in-s%C3%A3-o-paulo-brazil
#7
Kelly Polido Kaneshiro Olympio, Júlia Prestes da Rocha Silva, Agnes Soares da Silva, Vanessa Cristina de Oliveira Souza, Marília Afonso Rabelo Buzalaf, Fernando Barbosa, Maria Regina Alves Cardoso
In Brazil, there are scarce data on lead (Pb) and cadmium (Cd) contamination, especially for more vulnerable populations such as preschool children. In this paper, we answer two questions: (1) What are the exposure levels of lead and cadmium in preschool children, in Sao Paulo, Brazil? and (2) What are the risk factors associated with this exposure? This cross-sectional study included 50 day care centers (DCCs), totaling 2463 children aged 1-4 years. Venous blood samples were analyzed by ICP-MS. Questionnaires were administered to the parents...
May 18, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29783116/modelling-environment-contamination-with-heavy-metals-in-flathead-grey-mullet-mugil-cephalus-and-upper-sediments-from-north-african-coasts-of-the-mediterranean-sea
#8
Naouel Ouali, Bourhane-Eddine Belabed, Haroun Chenchouni
Heavy metals are a serious hazard for aquatic ecosystems and human health. They negatively affect aquatic life functioning through accumulation resulting physiological/growth disturbances in aquatic lifeforms. This survey focused on the assessment of heavy metal pollution in the Gulf of Annaba (northeastern Algeria), the largest and most diversified industrial hub in Africa, using a multi-compartment approach (water-sediment-biota). The study aims to characterize the spatiotemporal variation of trace metal (TM) contamination and its effects on the growth of the Flathead grey mullet (Mugil cephalus)...
May 18, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29782897/metal-concentrations-in-fillet-and-gill-of-parrotfish-scarus-ghobban-from-the-persian-gulf-and-implications-for-human-health
#9
Yadolah Fakhri, Narottam Saha, Ali Miri, Aziz Rahimizadeh, Laleh Roomiani, Mansour Ghaderpoori, Mahmoud Taghavi, Hassan Keramati, Zohreh Bahmani, Bigard Moradi, Nazak Amanidaz
Despite the benefits of seafood's consumption, the bioaccumulation of metals in fish can endanger consumers' health. This study analyzed lead (Pb), mercury (Hg), Arsenic (As), and Cadmium (Cd) concentrations in fillet and gill of parrotfish (Scarus ghobban) using flame atomic adsorption spectroscopy (FAAS). The potential non-carcinogenic and carcinogenic health risks due to consumption of Scarus ghobban fillet were assessed by estimating average target hazard quotient (THQ) and total target hazard quotient (TTHQ) and Incremental Lifetime Cancer Risk cancer risk (ILCR) of the analyzed metals...
May 18, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29780683/cyclic-lipopeptide-biosurfactant-from-bacillus-tequilensis-exhibits-multifarious-activity
#10
Arun Kumar Pradhan, Animesha Rath, Nilotpala Pradhan, Rupenangshu Kumar Hazra, Rati Ranjan Nayak, Sanjit Kanjilal
Bacillus tequilensis strain CH had been previously shown to produce a biosurfactant. In this study, chemical structure of the purified biosurfactant was determined by using high performance liquid chromatography and liquid chromatography-mass spectroscopy as a 10 amino acid cyclic lipopeptide (CL). The cyclic lipopeptide was found to be active against Anopheles culicifacies larvae with a LC50 of 110 µg/ml in 2 days. 1 ppm cadmium (Cd) which had a profound mutagenic effect on the cell division of onion ( Allium cepa ) root tip cell resulting in abnormal metaphase, abnormal anaphase and nuclei elongation was partially reversed in the presence of 0...
June 2018: 3 Biotech
https://www.readbyqxmd.com/read/29779079/preparation-and-adsorption-characteristics-for-heavy-metals-of-active-silicon-adsorbent-from-leaching-residue-of-lead-zinc-tailings
#11
Chang Lei, Bo Yan, Tao Chen, Xian-Ming Xiao
To comprehensively reuse the leaching residue obtained from lead-zinc tailings, an active silicon adsorbent (ASA) was prepared from leaching residue and studied as an adsorbent for copper(II), lead(II), zinc(II), and cadmium(II) in this paper. The ASA was prepared by roasting the leaching residue with either a Na2 CO3 /residue ratio of 0.6:1 at 700 °C for 1 h or a CaCO3 /residue ratio of 0.8:1 at 800 °C for 1 h. Under these conditions, the available SiO2 content of the ASA was more than 20%. The adsorption behaviors of the metal ions onto the ASA were investigated and the Langmuir, Freundlich, and Dubinin-Radushkevich isotherm models were used to analyze the adsorption isotherm...
May 19, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29778047/source-identification-and-spatial-distribution-of-arsenic-and-heavy-metals-in-agricultural-soil-around-hunan-industrial-estate-by-positive-matrix-factorization-model-principle-components-analysis-and-geo-statistical-analysis
#12
Xiaowen Zhang, Shuai Wei, Qianqian Sun, Syed Abdul Wadood, Boli Guo
Characterizing the distribution and defining potential sources of arsenic and heavy metals are the basic preconditions for reducing the contamination of heavy metals and metalloids. 71 topsoil samples and 61 subsoil samples were collected by grid method to measure the concentration of cadmium (Cd), arsenic (As), lead (Pb), copper (Cu), zinc (Zn), nickel (Ni) and chromium (Cr). Principle components analysis (PCA), GIS-based geo-statistical methods and Positive Matrix Factorization (PMF) were applied. The results showed that the mean concentrations were 9...
May 16, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29776370/characterization-of-a-promiscuous-cadmium-and-arsenic-resistance-mechanism-in-thermus-thermophilus-hb27-and-potential-application-of-a-novel-bioreporter-system
#13
Immacolata Antonucci, Giovanni Gallo, Danila Limauro, Patrizia Contursi, Ana Luisa Ribeiro, Alba Blesa, José Berenguer, Simonetta Bartolucci, Gabriella Fiorentino
BACKGROUND: The characterization of the molecular determinants of metal resistance has potential biotechnological application in biosensing and bioremediation. In this context, the bacterium Thermus thermophilus HB27 is a metal tolerant thermophile containing a set of genes involved in arsenic resistance which, differently from other microbes, are not organized into a single operon. They encode the proteins: arsenate reductase, TtArsC, arsenic efflux membrane transporter, TtArsX, and transcriptional repressor, TtSmtB...
May 18, 2018: Microbial Cell Factories
https://www.readbyqxmd.com/read/29775821/vermiremediation-of-metal-loid-s-via-eichornia-crassipes-phytomass-extraction-a-sustainable-technique-for-plant-amelioration
#14
Arnab Majumdar, Anil Barla, Munish Kumar Upadhyay, Dibyarpita Ghosh, Punarbasu Chaudhuri, Sudhakar Srivastava, Sutapa Bose
Eichhornia crassipes (water hyacinth), imparts deficiency of soluble arsenic and other toxic metal (loid)s through rhizofiltration and phytoaccumulation. Without proper management strategy, this phytoremediation of metal (loid)s might fail and get reverted back to the environment, contaminating the nearby water bodies. This study, focused on bio-conversion of phytoremediating hyacinths, spiked with 100 times and greater arsenic, lead and cadmium concentrations than the average water contamination, ranging in 58...
May 15, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29775200/cadmium-induced-changes-in-the-production-of-siderophores-by-a-plant-growth-promoting-strain-of-pseudomonas-fulva
#15
Dominika Thiem, Michał Złoch, Renata Gadzała-Kopciuch, Sonia Szymańska, Christel Baum, Katarzyna Hrynkiewicz
The impact of increasing Cd2+ exposure on the quality and quantity of siderophores produced by a plant growth promoting Pseudomonas fulva strain was tested to gain insight into the degree of change. P. fulva was cultured in the increasing concentrations of Cd2+ (0, 0.5, 1.0, 2.0 mM). The secreted siderophores were separated by HPLC and characterized by UHPLC-QTOF/MS. In the presence of 2 mM Cd2+ synthesis of siderophores (hydroxamates, catecholates, phenolates) was mitigated compared to the treatments with lower concentrations of Cd2+ (0...
May 18, 2018: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/29775104/the-ability-of-silybum-marianum-to-phytoremediate-cadmium-and-or-diesel-oil-from-the-soil
#16
Hossein Hammami, Ebrahim Alaie, Seyed Mohammad Mehdi Dastgheib
Phytoremediation is a new ecological and cost-effective technology applied for cleaning heavy metals and total petroleum hydrocarbon contaminated (TPH-contaminated) soils. This study was conducted to evaluate the potential of milk thistle (Silybum marianum) to phytoremediate cadmium (Cd (II)) from contaminated soils. To this end, the investigators applied a completely randomized design with the factorial arrangement and four replications. The results indicated that all the evaluated parameters of S. Marianum, including shoot and root fresh and dry weight, as well as shoot and root Cd, were significantly influenced by Cd (II) concentration and diesel oil (DO)...
July 3, 2018: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/29775102/individual-and-combined-effects-of-cadmium-and-polycyclic-aromatic-hydrocarbons-on-the-phytoremediation-potential-of-xanthium-sibiricum-in-co-contaminated-soil
#17
Nasreen Jeelani, Wen Yang, Yajun Qiao, Jingjing Li, Shuqing An, Xin Leng
Soil contamination with heavy metals and organic pollutants continues to cause major ecological damage and human health problems. Phytoremediation offers a highly promising technology for the recovery of sites contaminated with mixed pollutants. In this study, we performed a greenhouse experiment to investigate the individual and combined effects of cadmium (Cd) and polycyclic aromatic hydrocarbon (PAH) contamination on the growth of Xanthium sibiricum, and also the ability of this species to accumulate and remove Cd and to reduce PAHs over a period of 75 days...
July 3, 2018: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/29774338/trace-metals-in-oysters-molecular-and-cellular-mechanisms-and-ecotoxicological-impacts
#18
REVIEW
Wen-Xiong Wang, Jie Meng, Nanyan Weng
Oysters are important benthic bivalves in coastal and estuarine environments. They are widely farmed due to their rapid growth and taste; they are also widely applied in environmental monitoring of coastal pollution due to their accumulation of contaminants. Most importantly, oysters are among the few marine organisms that are considered to be hyper-accumulators of many toxic metals, such as cadmium, copper and zinc. As such, there is a tremendous call to study the interactions between metals and oysters, especially due to the increasing metal pollution in many coastal and estuarine waters...
May 18, 2018: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/29774016/taxon-function-decoupling-as-an-adaptive-signature-of-lake-microbial-metacommunities-under-a-chronic-polymetallic-pollution-gradient
#19
Bachar Cheaib, Malo Le Boulch, Pierre-Luc Mercier, Nicolas Derome
Adaptation of microbial communities to anthropogenic stressors can lead to reductions in microbial diversity and disequilibrium of ecosystem services. Such adaptation can change the molecular signatures of communities with differences in taxonomic and functional composition. Understanding the relationship between taxonomic and functional variation remains a critical issue in microbial ecology. Here, we assessed the taxonomic and functional diversity of a lake metacommunity system along a polymetallic pollution gradient caused by 60 years of chronic exposure to acid mine drainage (AMD)...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29773844/identification-of-differentially-accumulated-proteins-involved-in-regulating-independent-and-combined-osmosis-and-cadmium-stress-response-in-brachypodium-seedling-roots
#20
Ziyan Chen, Dong Zhu, Jisu Wu, Zhiwei Cheng, Xing Yan, Xiong Deng, Yueming Yan
In this study, we aimed to identify differentially accumulated proteins (DAPs) involved in PEG mock osmotic stress, cadmium (Cd2+ ) stress, and their combined stress responses in Brachypodium distachyon seedling roots. The results showed that combined PEG and Cd2+ stresses had more significant effects on Brachypodium seedling root growth, physiological traits, and ultrastructures when compared with each individual stress. Totally, 106 DAPs were identified that are responsive to individual and combined stresses in roots...
May 17, 2018: Scientific Reports
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