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https://www.readbyqxmd.com/read/29330821/effects-of-ferrous-sulfate-amendment-and-water-management-on-rice-growth-and-metal-loid-accumulation-in-arsenic-and-lead-co-contaminated-soil
#1
Lina Zou, Shu Zhang, Dechao Duan, Xinqiang Liang, Jiyan Shi, Jianming Xu, Xianjin Tang
Arsenic (As) and lead (Pb) commonly co-exist with high concentrations in paddy soil mainly due to human activities in south of China. This study investigates the effect of ferrous sulfate (FeSO4) amendment and water management on rice growth and arsenic (As) and lead (Pb) accumulation in rice plants. A paddy soil co-contaminated with As and Pb was chosen for the pot experiment with three FeSO4 levels (0, 0.25, and 1%, on a dry weight basis) and two water managements (flooded, non-flooded). The concentrations of As and Pb in iron plaques and rice plants were determined...
January 12, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29329086/effect-of-exogenous-phosphate-on-the-lability-and-phytoavailability-of-arsenic-in-soils
#2
Jinjin Wang, Xibai Zeng, Hao Zhang, Yongtao Li, Shizhen Zhao, Shiming Su, Lingyu Bai, Yanan Wang, Tuo Zhang
The effect of exogenous phosphate (P, 200 mg⋅kg-1 soil) on the lability and phytoavailability of arsenic (As) was studied using the diffusive gradients in thin films (DGT) technique. Lettuce were grown on the As-amended soils following the stabilization of soil labile As after 90 days incubation. Phosphate (P) application generally facilitated plant growth except one grown on P-sufficient soil. Soil labile As concentration increased in all the soils after P application due to a competition effect. Plant As concentration increased in red soils collected from Hunan Province, while decreases were observed in the other soils...
December 30, 2017: Chemosphere
https://www.readbyqxmd.com/read/29328264/mid-infrared-supercontinuum-generation-from-1-6-to-11%C3%A2-%C3%A2-%C3%AE-m-using-concatenated-step-index-fluoride-and-chalcogenide-fibers
#3
Ramon A Martinez, Genevieve Plant, Kaiwen Guo, Brian Janiszewski, Michael J Freeman, Robert L Maynard, Mohammed N Islam, Fred L Terry, Oseas Alvarez, Francois Chenard, Robert Bedford, Ricky Gibson, Agustin I Ifarraguerri
We demonstrate an all-fiber supercontinuum source that generates a continuous spectrum from 1.6 μm to >11  μm with 417 mW on-time average power at 33% duty cycle. By utilizing a master oscillator power amplifier pump with three amplification stages and concatenating solid core ZBLAN, arsenic sulfide, and arsenic selenide fibers, we shift 1550 nm light to ∼4.5  μm, ∼6.5  μm, and >11  μm, respectively. With 69 mW past 7.5 μm, this source provides both high power and broad spectral expansion, while outputting a single fundamental mode...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29321978/toxicity-of-formulants-and-heavy-metals-in-glyphosate-based-herbicides-and-other-pesticides
#4
N Defarge, J Spiroux de Vendômois, G E Séralini
The major pesticides of the world are glyphosate-based herbicides (GBH), and their toxicity is highly debated. To understand their mode of action, the comparative herbicidal and toxicological effects of glyphosate (G) alone and 14 of its formulations were studied in this work, as a model for pesticides. GBH are mixtures of water, with commonly 36-48% G claimed as the active principle. As with other pesticides, 10-20% of GBH consist of chemical formulants. We previously identified these by mass spectrometry and found them to be mainly families of petroleum-based oxidized molecules, such as POEA, and other contaminants...
2018: Toxicology Reports
https://www.readbyqxmd.com/read/29306143/arsenic-adsorption-and-plant-availability-in-an-agricultural-soil-irrigated-with-as-rich-water-effects-of-fe-rich-amendments-and-organic-and-inorganic-fertilisers
#5
Elena Arco-Lázaro, Tania Pardo, Rafael Clemente, Ma Pilar Bernal
The use of As-rich water for irrigation in agricultural soils may result in As accumulation in soil and crops, with the consequent risk of its entry into the food chain. The effectiveness of three different Fe-based materials (a commercial iron oxide (Bayoxide®), lamination slag (a by-product of the hot rolling of steel) and a commercial red mud derivative (ViroBind™)) used as soil amendments to minimise the impact of irrigation with As-rich water in an agricultural soil-plant system was evaluated in a pot experiment...
January 3, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29304476/human-health-risks-and-socio-economic-perspectives-of-arsenic-exposure-in-bangladesh-a-scoping-review
#6
REVIEW
M Azizur Rahman, A Rahman, M Zaved Kaiser Khan, Andre M N Renzaho
Arsenic contamination of drinking water, which can occur naturally or because of human activities such as mining, is the single most important public health issue in Bangladesh. Fifty out of the 64 districts in the country have arsenic concentration of groundwater exceeding 50µgL-1, the Bangladeshi threshold, affecting 35-77 million people or 21-48% of the total population. Chronic arsenic exposure through drinking water and other dietary sources is an important public health issue worldwide affecting hundreds of millions of people...
January 2, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29301332/arsenic-uptake-toxicity-detoxification-and-speciation-in-plants-physiological-biochemical-and-molecular-aspects
#7
REVIEW
Ghulam Abbas, Behzad Murtaza, Irshad Bibi, Muhammad Shahid, Nabeel Khan Niazi, Muhammad Imran Khan, Muhammad Amjad, Munawar Hussain
Environmental contamination with arsenic (As) is a global environmental, agricultural and health issue due to the highly toxic and carcinogenic nature of As. Exposure of plants to As, even at very low concentration, can cause many morphological, physiological, and biochemical changes. The recent research on As in the soil-plant system indicates that As toxicity to plants varies with its speciation in plants (e.g., arsenite, As(III); arsenate, As(V)), with the type of plant species, and with other soil factors controlling As accumulation in plants...
January 2, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29277036/arsenic-uptake-by-arugula-eruca-vesicaria-l-cultivars-as-affected-by-phosphate-availability
#8
Xiaoyan Tang, Maya P Lim, Murray B McBride
To assess the importance of variation among arugula (Eruca vesicaria subsp. sativa) cultivars in the ability to accumulate arsenic (As) in above-ground tissues, uptake of As by 16 cultivars was measured in the field and in hydroponic culture. In the field trial on soil contaminated by past pesticide use, As soil-plant uptake coefficients varied by a factor of 2.7 among different cultivars, approaching a value of one for the strongest accumulators. Compared to the field assay, hydroponically grown arugula accumulated much lower concentrations of As when nutrient solutions contained standard (high) concentrations of phosphate along with 1...
December 22, 2017: Chemosphere
https://www.readbyqxmd.com/read/29250089/abiotic-stress-phenotypes-are-associated-with-conserved-genes-derived-from-transposable-elements
#9
Zoé Joly-Lopez, Ewa Forczek, Emilio Vello, Douglas R Hoen, Akiko Tomita, Thomas E Bureau
Plant phenomics offers unique opportunities to accelerate our understanding of gene function and plant response to different environments, and may be particularly useful for studying previously uncharacterized genes. One important type of poorly characterized genes is those derived from transposable elements (TEs), which have departed from a mobility-driven lifestyle to attain new adaptive roles for the host (exapted TEs). We used phenomics approaches, coupled with reverse genetics, to analyze T-DNA insertion mutants of both previously reported and novel protein-coding exapted TEs in the model plant Arabidopsis thaliana...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29249024/investigations-of-microbial-degradation-of-polycyclic-aromatic-hydrocarbons-based-on-13c-labeled-phenanthrene-in-a-soil-co-contaminated-with-trace-elements-using-a-plant-assisted-approach
#10
Anna Wawra, Wolfgang Friesl-Hanl, Anna Jäger, Markus Puschenreiter, Gerhard Soja, Thomas Reichenauer, Andrea Watzinger
Co-contaminations of soils with organic and inorganic pollutants are a frequent environmental problem. Due to their toxicity and recalcitrance, the heterogeneous pollutants may persist in soil. The hypothesis of this study was that degradation of polycyclic aromatic hydrocarbons (PAHs) is enhanced if heavy metals in soil are immobilized and their bioavailability reduced. For metal immobilization and enhanced biodegradation, distinct mineral and organic soil amendments (iron oxides, gravel sludge, biochar) were deployed in an incubation batch experiment...
December 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29247933/remediation-of-arsenic-contaminated-soil-using-malposed-intercropping-of-pteris-vittata-l-and-maize
#11
Jie Ma, En Lei, Mei Lei, Yanhong Liu, Tongbin Chen
Intercropping of arsenic (As) hyperaccumulator and cash crops during remediation of contaminated soil has been applied in farmland remediation project. However, little is known about the fate of As fractions in the soil profile and As uptake within the intercropping plants under field condition. In this study, As removal, uptake, and translocation were investigated within an intercropping system of Pteris vittata L. (P. vittata) and maize (Zea mays). Results indicated that the concentration of As associated with amorphous Fe (hydr)oxides in the 10-20 cm soil layer was significantly lower under malposed intercropping of P...
November 22, 2017: Chemosphere
https://www.readbyqxmd.com/read/29244955/dose-and-diet-sources-of-arsenic-intake-in-mouse-in-utero-exposure-scenarios
#12
Manuela Murko, Brittany Elek, Miroslav Styblo, David James Thomas, Kevin A Francesconi
In humans, early life exposure to inorganic arsenic is associated with adverse health effects. Inorganic arsenic in utero or in early postnatal life also produces adverse health effects in offspring of pregnant mice that consumed drinking water containing low part per billion levels of inorganic arsenic. Because aggregate exposure of pregnant mice to inorganic arsenic from both drinking water and food has not been fully evaluated in experimental studies, quantifying arsenic exposure of the developing mouse is problematic...
December 15, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/29220736/arsenic-stress-effects-on-root-water-absorption-in-soybean-plants-physiological-and-morphological-aspects
#13
Mariana E Vezza, Analía Llanes, Claudia Travaglia, Elizabeth Agostini, Melina A Talano
Soybean (Glycine max L.) is often cultivated in areas contaminated with arsenic (As), which negatively affects plant growth and reduces crop yield. The deleterious effects may be due, at least in part, to disturbances in the water status, as was reported for some plants exposed to heavy metals. However, to our knowledge, these mechanisms have not been studied in depth in soybean plants exposed to As. The aim of the present work was to analyze possible changes in water relations and the responses developed in soybean plants under arsenate (AsV) and arsenite (AsIII) stress...
December 2, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29216271/genomic-and-phenotypic-characteristics-of-swedish-c-jejuni-water-isolates
#14
Anna Nilsson, Cecilia Johansson, Astrid Skarp, René Kaden, Lars Engstrand, Hilpi Rautelin
Campylobacter jejuni is the most common cause of bacterial gastroenteritis. Major reservoirs are warm-blooded animals, poultry in particular, but Campylobacter can also be transmitted via water. In this paper, we have taken a closer look at the biology and potential virulence of C. jejuni water isolates. Seven C. jejuni isolates from incoming surface water at water plants in Sweden were characterized with whole genome sequencing and phenotypical testing. Multi locus sequence typing analysis revealed that these isolates belonged to groups known to include both common (ST48CC) and uncommon (ST1275CC, ST683, ST793 and ST8853) human pathogens...
2017: PloS One
https://www.readbyqxmd.com/read/29202269/opportunities-and-challenges-in-the-use-of-mineral-nutrition-for-minimizing-arsenic-toxicity-and-accumulation-in-rice-a-critical-review
#15
REVIEW
Saifullah, Saad Dahlawi, Asif Naeem, Muhammad Iqbal, Muhammad Ansar Farooq, Sadia Bibi, Zed Rengel
Growing rice on arsenic (As)-contaminated soil or irrigating with As-contaminated water leads to significant accumulation of As in grains. Moreover, rice accumulates more As into grains than other cereal crops. Thus, rice consumption has been identified as a major route of human exposure to As in many countries. Inorganic As species are carcinogenic and could pose a considerable health risk to humans even at low dietary concentration. Genotypic variation and concentration of nutrients such as iron, manganese, phosphate, sulfur and silicon are the two main factors that affect As accumulation in rice grains...
December 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/29189890/decoding-the-role-of-hypothetical-protein-all3255-of-anabaena-pcc7120-in-heavy-metal-stress-management-in-escherichia-coli
#16
Prashant Kumar Singh, Mengmeng Tang, Sudhir Kumar, Alok Kumar Shrivastava
Cadmium is a non-essential toxic heavy metal for organisms, including plants and cyanobacteria. Cadmium resistance transporters involved in resistance of cells against various toxicants such as drugs and effluxes cytotoxic compounds from cells. However, cadmium resistance-associated protein (CadD) has never been reported from a diazotrophic cyanobacterium Anabaena sp. To test whether the hypothetical protein All3255 of Anabaena sp. PCC7120 a homolog of cadmium resistance-associated protein (CadD) involved in cadmium or heavy metal resistance or not, cloning and heterologous expression analysis of all3255 performed in Escherichia coli BL21 (DE3)...
November 30, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/29188998/transcriptional-activity-of-arsenic-reducing-bacteria-and-genes-regulated-by-lactate-and-biochar-during-arsenic-transformation-in-flooded-paddy-soil
#17
Jiangtao Qiao, Xiaomin Li, Min Hu, Fangbai Li, Lily Y Young, Weimin Sun, Weilin Huang, Jianghu Cui
Organic substrates and biochar are important in controlling arsenic release from sediments and soils, however, little is known about their impacts on arsenic-reducing bacteria and genes during arsenic transformation in flooded paddy soils. In this study, microcosm experiments were established to profile transcriptional activity of As(V)-respiring gene (arrA) and arsenic resistance gene (arsC) as well as the associated bacteria regulated by lactate and/or biochar in anaerobic arsenic-contaminated paddy soils...
November 30, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29179146/copper-interactions-on-arsenic-bioavailability-and-phytotoxicity-in-soil
#18
Mohammed Kader, Dane T Lamb, Liang Wang, Mallavarapu Megharaj, Ravi Naidu
Arsenic (As) and copper (Cu) are co-contaminants in the environment but little is known about their ecological impact as mixtures in soil. In this study, we investigated the combined As-Cu interactions on toxicity and uptake as binary mixtures in 5 contrasting soils. The study included solubility, contaminant uptake and toxicity in cucumber (Cucumis sativus L.) as a model plant species. Soils were spiked individually and as a mixtures at 10 different As levels (2, 4, 8 up to 1024mgkg-1). Copper was added with As at two effective concentration levels (EC10Cu and EC50Cu)...
November 24, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29172148/genetic-characterization-micropropagation-and-potential-use-for-arsenic-phytoremediation-of-dittrichia-viscosa-l-greuter
#19
Francesco Guarino, Barbara Conte, Giovanni Improta, Rosaria Sciarrillo, Stefano Castiglione, Angela Cicatelli, Carmine Guarino
In the last decade, many scientists have focused their attention on the search for new plant species that can offer improved capacities to reclaim polluted soils and waters via phytoremediation. In this study, seed batches from three natural populations of Dittrichia viscosa, harvested in rural, urban, and industrial areas of central and southern Italy, were used to: (i) evaluate the genetic and morphological diversity of the populations; (ii) develop an efficient protocol for in-vitro propagation from seedling microcuttings; (iii) achieve optimal acclimatization of micropropagated plants to greenhouse conditions; (iv) test the response to arsenic (As) soil contamination of micropropagated plants...
November 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29163593/osarm1-an-r2r3-myb-transcription-factor-is-involved-in-regulation-of-the-response-to-arsenic-stress-in-rice
#20
Feng-Zhu Wang, Mo-Xian Chen, Lu-Jun Yu, Li-Juan Xie, Li-Bing Yuan, Hua Qi, Ming Xiao, Wuxiu Guo, Zhe Chen, Keke Yi, Jianhua Zhang, Rongliang Qiu, Wensheng Shu, Shi Xiao, Qin-Fang Chen
Bioaccumulation of arsenic (As) in rice (Oryza sativa) increases human exposure to this toxic, carcinogenic element. Recent studies identified several As transporters, but the regulation of these transporters remains unclear. Here, we show that the rice R2R3 MYB transcription factor OsARM1 (ARSENITE-RESPONSIVE MYB1) regulates As-associated transporters genes. Treatment with As(III) induced OsARM1 transcript accumulation and an OsARM1-GFP fusion localized to the nucleus. Histochemical analysis of OsARM1pro::GUS lines indicated that OsARM1 was expressed in the phloem of vascular bundles in basal and upper nodes...
2017: Frontiers in Plant Science
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