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https://www.readbyqxmd.com/read/29147882/growth-inhibition-patterns-and-transfer-factor-profiles-in-arsenic-stressed-rice-oryza-sativa-l
#1
Ha-Il Jung, Jinwook Lee, Mi-Jin Chae, Myung-Suk Kong, Chang-Hoon Lee, Seong-Soo Kang, Yoo-Hak Kim
Arsenic (As) accumulation in rice owing to uptake from the soil is a critical human health issue. Here, we studied the chemical properties of As-treated soils, growth inhibition patterns of As-stressed rice plants, changes in the As content of soil and soil solutions, and the relationship between As accumulation and As transfer factor from the soil to the rice organs. Rice plants were cultivated in a greenhouse under four concentrations of As: 0 (control), 25, 50, and 75 mg kg(-1). A significant positive correlation was found between available P2O5 and exchangeable K and between As concentration and available P2O5 or exchangeable K...
November 16, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29145070/arsenic-forms-and-their-combinations-induce-differences-in-phenolic-accumulation-in-ulmus-laevis-pall
#2
Kinga Drzewiecka, Monika Gąsecka, Paweł Rutkowski, Zuzanna Magdziak, Piotr Goliński, Mirosław Mleczek
Total phenolics and the profile of phenolic acids and flavonoids were investigated in the roots and leaves of Ulmus laevis cultured on the medium with inorganic and organic arsenic - As(III), As(V) and DMA(V) at 0.06mM and their equimolar combinations. Further, the accumulation of salicylic acid (free and glucoside-bound) and lipid oxidation were assayed following a three-month long experiment. As treatment caused elevated production of phenolics, which was higher in photosynthetic tissue than in roots for all As forms and their combinations, and their overall content was correlated with the accumulation of organic As in roots and As(III) in leaves...
November 11, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/29144296/dynamic-desorption-of-arsenic-from-polymer-supported-hydrated-iron-iii-oxide-in-a-wastewater-treatment-plant
#3
Jian-Long Hu, Xiao-Song Yang, Ting Liu, Li-Nan Shao, Wang Zhang
Polymer-supported hydrated iron(III) oxide (PHIO) was successfully applied as adsorbent for arsenic removal in a wastewater treatment plant in Nandan, China. The practical PHIO adsorbent samples (PHIO-P) were collected from the adsorption column of the wastewater treatment plant, and desorption experiments of the adsorbent were carried out. Our results showed that the formation of precipitates on the surface of PHIO-P might block the porous channel of the adsorbent and decrease its arsenic adsorption capacity...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29134529/transcriptional-changes-measured-in-rice-roots-after-exposure-to-arsenite-contaminated-sediments
#4
Alexandra Brinke, Georg Reifferscheid, Roland Klein, Ute Feiler, Sebastian Buchinger
Transcriptional analyses are discussed to provide a deeper understanding of the molecular mechanisms underlying toxic effects. Thus, they can complement classic ecotoxicological test methods and potentially allow the identification of biomarkers associated to the exposure of chemical stressors and or adverse biological effects. This feasibility study intended to identify a set of potential gene expression biomarkers for arsenite-exposure in rice roots that could complement the informative value of an existing sediment-contact test with rice...
November 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29132083/fly-ash-classification-efficiency-of-electrostatic-precipitators-in-fluidized-bed-combustion-of-peat-wood-and-forest-residues
#5
Katja Ohenoja, Mika Körkkö, Valter Wigren, Jan Österbacka, Mirja Illikainen
The increasing use of biomasses in the production of electricity and heat results in an increased amount of burning residue, fly ash which disposal is becoming more and more restricted and expensive. Therefore, there is a great interest in utilizing fly ashes instead of just disposing of it. This study aimed to establish whether the utilization of fly ash from the fluidized bed combustion of peat, wood, and forest residues can be improved by electrostatic precipitator separation of sulfate, chloride, and some detrimental metals...
November 10, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29080824/prediction-of-arsenic-and-antimony-transporter-major-intrinsic-proteins-from-the-genomes-of-crop-plants
#6
Abul Kalam Azad, Jahed Ahmed, Md Asraful Alum, Md Mahbub Hasan, Takahiro Ishikawa, Yoshihiro Sawa
Major intrinsic proteins (MIPs), commonly known as aquaporins, transport water and non-polar small solutes. Comparing the 3D models and the primary selectivity-related motifs (two Asn-Pro-Ala (NPA) regions, the aromatic/arginine (ar/R) selectivity filter, and Froger's positions (FPs)) of all plant MIPs that have been experimentally proven to transport arsenic (As) and antimony (Sb), some substrate-specific signature sequences (SSSS) or specificity determining sites (SDPs) have been predicted. These SSSS or SDPs were determined in 543 MIPs found in the genomes of 12 crop plants; the As and Sb transporters were predicted to be distributed in noduline-26 like intrinsic proteins (NIPs), and every plant had one or several As and Sb transporter NIPs...
October 26, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29069505/lung-bladder-and-kidney-cancer-mortality-40-years-after-arsenic-exposure-reduction
#7
Allan H Smith, Guillermo Marshall, Taehyun Roh, Catterina Ferreccio, Jane Liaw, Craig Steinmaus
Background: Region II in northern Chile (population 442 570) experienced a sudden major increase in arsenic water concentrations in 1958 in the main city of Antofagasta, followed by a major reduction in exposure when an arsenic removal plant was installed in 1970. It provides a unique opportunity to study latency effects of exposure to arsenic, and this is the first study with mortality data up to 40 years after exposure reduction. Methods: We previously identified high mortality rates in Region II up to the year 2000...
October 24, 2017: Journal of the National Cancer Institute
https://www.readbyqxmd.com/read/29056439/new-molecular-mechanisms-to-reduce-arsenic-in-crops
#8
REVIEW
Emma R Lindsay, Frans J M Maathuis
Arsenic is toxic to all life forms and is a potent carcinogen. Its accumulation in crop plants and subsequent consumption poses a serious threat to public health worldwide. Recent developments have enhanced our understanding of the molecular mechanisms governing arsenic uptake, detoxification, and accumulation in plants. In particular, the identification of plant arsenate reductase enzymes and emerging details of the processes underlying arsenic distribution and deposition in the seed will prove invaluable in the development of new strategies to mitigate this threat...
October 19, 2017: Trends in Plant Science
https://www.readbyqxmd.com/read/29055111/genetic-based-dissection-of-arsenic-accumulation-in-maize-using-a-genome-wide-association-analysis-method
#9
Zhan Zhao, Huaisheng Zhang, Zhongjun Fu, Hao Chen, Yanan Lin, Pengshuai Yan, Weihua Li, Huiling Xie, Zhanyong Guo, Xuehai Zhang, Jihua Tang
Understanding the mechanism of arsenic (As) accumulation in plants is important in reducing As's toxicity to plants and its potential risks to human health. Here, we performed a genome-wide association study to dissect the genetic basis of the As contents of different maize tissues in Xixian, which was irrigated with As-rich surface water, and Changge using an association population consisting of 230 representative inbred maize lines. Phenotypic data revealed a wide normal distribution and high repeatability for the As contents in maize tissues...
October 21, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/29055029/cancer-incidence-in-adults-living-in-the-vicinity-of-nuclear-power-plants-in-france-based-on-data-from-the-french-network-of-cancer-registries
#10
Alice Desbiolles, Candice Roudier, Sarah Goria, Morgane Stempfelet, Cécile Kairo, Cécile Quintin, Marie-Laure Bidondo, Alain Monnereau, Blandine Vacquier
Nuclear power plants (NPPs) release toxic emissions into the environment that may affect neighboring populations. This ecologic study was designed to investigate the possibility of an excess incidence of cancer in the vicinity of French NPPs by examining the incidence by municipality of 12 types of cancer in the population aged 15 years and older during the 1995-2011 period. Population exposure to pollution was estimated on the basis of distance from towns of residence to the NPP. Using regression models, we assessed the risk of cancer in a 20-kilometer zone around NPPs and observed an excess incidence of bladder cancer (Relative Risk (RR), 95% Credibility Interval (95% CI)) in men and women (RRmen = 1...
October 21, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/29053347/phytotoxicity-of-tin-mine-waste-and-accumulation-of-involved-heavy-metals-in-common-buckwheat-fagopyrum-esculentum-moench
#11
Jürgen Franzaring, Walter Damsohn, Andreas Fangmeier, Sonja Schlosser, Hannes Kurz, Philipp Büttner
Extraction and processing of cassiterite (SnO2) left large tailings with high concentrations of tin, tungsten, molybdenum and lithium. Information on the phytotoxicity of mine waste is important with regard to ecological hazards. Exposure studies help to identify plants useful for the stabilization of waste tips and the phytomining of metals. A greenhouse study was performed using a dilution series of mine waste and four crops, a halophytic and a metallophytic species to derive dose response curves. Based on effective doses for growth reductions, sensitivity increased in the following order: maize > common buckwheat > quinoa > garden bean...
October 20, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/29035752/regulation-of-oxidative-stress-and-mineral-nutrient-status-by-selenium-in-arsenic-treated-crop-plant-oryza-sativa
#12
R Singh, A K Upadhyay, D P Singh
The present study was conducted to examine the impact of selenium (Se) on mineral nutrient status and oxidative stress in crop plant Oryza sativa treated with arsenic (As). Scanning electron microscopy (SEM) coupled with Energy dispersive x-ray spectroscopy (EDS) study revealed the morphological deformities in leaf veins along with granular deposition on the leaf surface. The EDS analysis exhibited loss of elements (S, Si, Cl, K, Ca, Fe and Cu) in As(III) treatment in rice roots as compared to untreated root...
October 12, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29033177/arsenic-phosphorus-interactions-in-the-soil-plant-microbe-system-dynamics-of-uptake-suppression-and-toxicity-to-plants
#13
Hossain M Anawar, Zed Rengel, Paul Damon, Mark Tibbett
High arsenic (As) concentrations in the soil, water and plant systems can pose a direct health risk to humans and ecosystems. Phosphate (Pi) ions strongly influence As availability in soil, its uptake and toxicity to plants. Better understanding of As(V)-Pi interactions in soils and plants will facilitate a potential remediation strategy for As contaminated soils, reducing As uptake by crop plants and toxicity to human populations via manipulation of soil Pi content. However, the As(V)-Pi interactions in soil-plant systems are complex, leading to contradictory findings among different studies...
October 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29032263/comparison-of-dgt-with-traditional-extraction-methods-for-assessing-arsenic-bioavailability-to-brassica-chinensis-in-different-soils
#14
Yunchao Dai, Mubasher Nasir, Yulin Zhang, Jiakai Gao, Yamin Lv, Jialong Lv
Several predictive models and methods have been used for heavy metals bioavailability, but there is no universally accepted approach in evaluating the bioavailability of arsenic (As) in soil. The technique of diffusive gradients in thin-films (DGT) is a promising tool, but there is a considerable debate with respect to its suitability. The DGT method was compared with other traditional chemical extractions techniques (soil solution, NaHCO3, NH4Cl, HCl, and total As method) for estimating As bioavailability in soil based on a greenhouse experiment using Brassica chinensis grown in various soils from 15 provinces in China...
October 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/29026193/biomarker-indicated-extent-of-oxidation-of-plant-derived-organic-carbon-oc-in-relation-to-geomorphology-in-an-arsenic-contaminated-holocene-aquifer-cambodia
#15
Daniel Magnone, Laura A Richards, David A Polya, Charlotte Bryant, Merren Jones, Bart E van Dongen
The poisoning of rural populations in South and Southeast Asia due to high groundwater arsenic concentrations is one of the world's largest ongoing natural disasters. It is important to consider environmental processes related to the release of geogenic arsenic, including geomorphological and organic geochemical processes. Arsenic is released from sediments when iron-oxide minerals, onto which arsenic is adsorbed or incorporated, react with organic carbon (OC) and the OC is oxidised. In this study we build a new geomorphological framework for Kandal Province, a highly studied arsenic affected region of Cambodia, and tie this into wider regional environmental change throughout the Holocene...
October 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29024589/knocking-out-ospt4-gene-decreases-arsenate-uptake-by-rice-plants-and-inorganic-arsenic-accumulation-in-rice-grains
#16
Yue Cao, Dan Sun, Hao Ai, Hanyi Mei, Xue Liu, Shubin Sun, Guohua Xu, Yungen Liu, Yanshan Chen, Lena Q Ma
Arsenic (As) accumulation in rice grains poses health risk to humans. Plants including rice take up arsenate (AsV) by phosphate transporters. In this study, rice phosphate transporter OsPT4 (OsPht1;4) was investigated based on two independent T-DNA insertion mutants of OsPT4 (M1 and M2), which displayed stronger AsV resistance than wild types WT1 and WT2. When cultivated in medium (+P or -P) with AsV, ospt4 mutants accumulated 16-32% lower As in plants, suggesting that OsPT4 mediates AsV uptake. Analysis of the xylem sap showed that AsV concentrations in ospt4 mutants was 20-40% lower than WT controls under -P condition, indicating OsPT4 may also mediate AsV translocation...
November 7, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29022178/interactive-effects-of-pahs-with-different-rings-and-as-on-their-uptake-transportation-and-localization-in-as-hyperaccumulator
#17
Xiaoyong Liao, Zeying Wu, Xu Ma, Xuegang Gong, Xiulan Yan
In order to illuminate the mechanism of the interaction of polycyclic aromatic hydrocarbon (PAH) with different benzene rings and arsenic (As) in As hyperaccumulator, Pteris vittata L., the uptakes of PAHs were investigated using hydroponics simulation and localizations of PAHs in the plant were determined using two-photon laser scanning confocal microscopy (TPLSCM). The results showed that the total As concentration in different parts of P. vittata decreased in the presence of PAHs with increased numbers of benzene rings: 38...
October 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29018967/mitigating-arsenic-contamination-in-rice-plants-with-an-aquatic-fern-marsilea-minuta
#18
Ummehani Hassi, Md Tawhid Hossain, S M Imamul Huq
Dangers of arsenic contamination are well known in human civilization. The threat increases when arsenic is accumulated in food and livestock through irrigated crops or animal food. Hence, it is important to mitigate the effects of arsenic as much as possible. This paper discusses a process for reducing the level of arsenic in different parts of rice plants with an aquatic fern, Marsilea minuta L. A pot experiment was done to study the possibility of using Marsilea minuta as a phytoremediator of arsenic. Rice and Marsilea minuta were allowed to grow together in soils...
October 10, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29016913/phytochelatin-synthase-has-contrasting-effects-on-cadmium-and-arsenic-accumulation-in-rice-grains
#19
Shimpei Uraguchi, Nobuhiro Tanaka, Christian Hofmann, Kaho Abiko, Naoko Ohkama-Ohtsu, Michael Weber, Takehiro Kamiya, Yuka Sone, Ryosuke Nakamura, Yasukazu Takanezawa, Masako Kiyono, Toru Fujiwara, Stephan Clemens
Phytochelatin (PC) synthesis has been well demonstrated as a major metal tolerance mechanism in Arabidopsis thaliana, whereas its contribution to long-distance element transport especially in monocots remains elusive. Using rice as a cereal model, we examined physiological roles of OsPCS1 in the distribution and detoxification of arsenic (As) and cadmium (Cd), two toxic elements associated with major food safety concerns. First, we isolated four different transcript variants of OsPCS1 as well as one from OsPCS2...
August 14, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28987987/a-sequential-treatment-of-intermediate-tropical-landfill-leachate-using-a-sequencing-batch-reactor-sbr-and-coagulation
#20
Zi Jun Yong, Mohammed J K Bashir, Choon Aun Ng, Sumathi Sethupathi, Jun-Wei Lim
The increase in landfill leachate generation is due to the increase of municipal solid waste (MSW) as global development continues. Landfill leachate has constantly been the most challenging issue in MSW management as it contains high amount of organic and inorganic compounds that might cause pollution to water resources. Biologically treated landfill leachate often fails to fulfill the regulatory discharge standards. Thus, to prevent environmental pollution, many landfill leachate treatment plants involve multiple stages treatment process...
January 1, 2018: Journal of Environmental Management
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