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https://www.readbyqxmd.com/read/28345894/rich-coordination-chemistry-of-%C3%AF-acceptor-dibenzoarsole-ligands
#1
Arvind Kumar Gupta, Sunisa Akkarasamiyo, Andreas Orthaber
A series of dibenzoarsole (also known as 9-arsafluorene) derivatives have been prepared, and their coordination chemistry has been investigated. The different ligand topology and the arsenic substituents govern the reactivity of the ligands. We report various crystal structures of palladium and platinum complexes derived from this family of ligands. The biphenyl backbone of the bridged bidentate ligands allows very flexible coordination. We have also studied the application of an allylic Pd complex in nucleophilic substitution reactions, revealing that the benzoarsole substituent is susceptible to metal insertion...
March 27, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28343659/iron-and-zinc-supplementation-does-not-impact-urinary-arsenic-excretion-in-mexican-school-children
#2
Katarzyna Kordas, Aditi Roy, Patricia López, Gonzalo García-Vargas, Mariano E Cebrián, Eunice Vera-Aguilar, Jorge L Rosado
OBJECTIVE: To examine the role of iron and zinc in arsenic excretion and metabolism in children. STUDY DESIGN: An analysis of urinary arsenic (UAs) concentrations from a double-blind randomized trial originally testing the efficacy of iron and zinc for lowering blood lead levels in children. A 2 × 2 factorial design was used, with children randomized individually, stratified by sex and classroom, to receive 30 mg ferrous fumarate (n = 148), 30 mg zinc oxide (n = 144), iron and zinc together (n = 148), or placebo (n = 151)...
March 23, 2017: Journal of Pediatrics
https://www.readbyqxmd.com/read/28342052/arsenic-concentrations-in-local-aromatic-and-high-yielding-hybrid-rice-cultivars-and-the-potential-health-risk-a-study-in-an-arsenic-hotspot
#3
Arifin Sandhi, Maria Greger, Tommy Landberg, Gunnar Jacks, Prosun Bhattacharya
The presence of high levels of arsenic (As) in rice fields has negative effects on the health of those consuming rice as their subsistence food. This study determined the variation in total As concentration in local aromatic rice (LAR) (kalijira) and two high-yielding varieties (HYVs) (BRRI dhan 32 and BRRI dhan 28) grown in paddy fields in Matlab, Bangladesh, an As hotspot with elevated As levels in groundwater. Mature rice grain samples and soil samples were collected from different paddy fields, and the As concentrations in both the de-husked grains and the husks of the three rice cultivars were analysed to identify the safest of the three cultivars for human consumption...
April 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28342047/blood-toxic-metals-and-hemoglobin-levels-in-mexican-children
#4
Guadalupe López-Rodríguez, Marcos Galván, Marco González-Unzaga, Juan Hernández Ávila, M Pérez-Labra
Metal toxicity can cause hematologic abnormalities and hemolysis. To evaluate the relationship of anemia with metal contamination in children, the following elements were quantified in dry blood: silicon, chromium, lead, titanium, vanadium, nickel, arsenic, manganese, and cadmium. A total of 88 samples of anemic children and 208 of non-anemic children aged 6-12 years were analyzed. Lead (35.1%), chromium (24.3%), vanadium (24.3%), nickel (45.6%), and silicon (48.6%) were identified in the samples, with titanium only detected in anemic children...
April 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28343275/potential-toxic-elements-in-stream-sediments-soils-and-waters-in-an-abandoned-radium-mine-central-portugal
#5
I M H R Antunes, A M R Neiva, M T D Albuquerque, P C S Carvalho, A C T Santos, Pedro P Cunha
The Alto da Várzea radium mine (AV) exploited ore and U-bearing minerals, such as autunite and torbernite. The mine was exploited underground from 1911 to 1922, closed in 1946 without restoration, and actually a commercial area is deployed. Stream sediments, soils and water samples were collected between 2008 and 2009. Stream sediments are mainly contaminated in As, Th, U and W, which is related to the AV radium mine. The PTEs, As, Co, Cr, Sr, Th, U, W, Zn, and electrical conductivity reached the highest values in soils collected inside the mine influence...
March 25, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28343272/effect-of-atra-and-ato-on-the-expression-of-tissue-factor-in-nb4-acute-promyelocytic-leukemia-cells-and-regulatory-function-of-the-inflammatory-cytokines-tnf-and-il-1%C3%AE
#6
Sylvie Dunoyer-Geindre, Anne-Sophie Rivier-Cordey, Olga Tsopra, Thomas Lecompte, Egbert K O Kruithof
The characteristic hemorrhages of acute promyelocytic leukemia (APL) are caused in part by the high expression of tissue factor (TF) on leukemic cells, which also produce TNF and IL-1β, proinflammatory cytokines known to increase TF in various cell types. Exposure of NB4 cells, an APL cell line, to all-trans retinoic acid (ATRA) or arsenic trioxide (ATO) rapidly and strongly reduced TF mRNA. Both drugs also reduced TNF mRNA, but later, and moreover increased IL-1β mRNA. The effect on procoagulant activity of cells and microparticles, as measured with calibrated automated thrombography, was delayed and only partial at 24 h...
March 25, 2017: Annals of Hematology
https://www.readbyqxmd.com/read/28343041/characterization-of-regional-cold-hydrothermal-inflows-enriched-in-arsenic-and-associated-trace-elements-in-the-southern-part-of-the-duero-basin-spain-by-multivariate-statistical-analysis
#7
Elena Giménez-Forcada, Marisol Vega-Alegre, Susana Timón-Sánchez
Naturally occurring arsenic in groundwater exceeding the limit for potability has been reported along the southern edge of the Cenozoic Duero Basin (CDB) near its contact with the Spanish Central System (SCS). In this area, spatial variability of arsenic is high, peaking at 241μg/L. Forty-seven percent of samples collected contained arsenic above the maximum allowable concentration for drinking water (10μg/L). Correlations of As with other hydrochemical variables were investigated using multivariate statistical analysis (Hierarchical Cluster Analysis, HCA and Principal Component Analysis, PCA)...
March 23, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28342414/impacts-of-soil-incorporation-of-pre-incubated-silica-rich-rice-residue-on-soil-biogeochemistry-and-greenhouse-gas-fluxes-under-flooding-and-drying
#8
Madison Y Gutekunst, Rodrigo Vargas, Angelia L Seyfferth
Incorporation of silica-rich rice husk residue into flooded paddy soil decreases arsenic uptake by rice. However, the impact of this practice on soil greenhouse gas (GHG) emissions and elemental cycling is unresolved particularly as amended soils experience recurrent flooding and drying cycles. We evaluated the impact of pre-incubated silica-rich rice residue incorporation to soils on pore water chemistry and soil GHG fluxes (i.e., CO2, CH4, N2O) over a flooding and drying cycle typical of flooded rice cultivation...
March 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28342372/comparison-of-three-sequential-extraction-procedures-for-arsenic-fractionation-in-highly-polluted-sites
#9
Xiang Wan, Haochen Dong, Liu Feng, Zhijia Lin, Qiuchen Luo
Three sequential extraction procedures (SEPs) including Tessier, Rauret, and Shiowatana SEPs, were compared for arsenic fractionation using highly polluted soils. In the definition context of exchangeable, reducible, oxidizable and residual fractions, with similar arsenic recovery and reproducibility, Tessier and Rauret SEPs were comparable to each other, whereas Shiowatana SEP showed higher extraction efficiency in all the first three arsenic fractions, although it might overestimate the reducible arsenic...
March 22, 2017: Chemosphere
https://www.readbyqxmd.com/read/28340464/a-review-on-various-electrochemical-techniques-for-heavy-metal-ions-detection-with-different-sensing-platforms
#10
REVIEW
BabanKumar Bansod, Tejinder Kumar, Ritula Thakur, Shakshi Rana, Inderbir Singh
Heavy metal ions are non-biodegradable and contaminate most of the natural resources occurring in the environment including water. Some of the heavy metals including Lead (Pb), Mercury (Hg), Arsenic (As), Chromium (Cr) and Cadmium (Cd) are considered to be highly toxic and hazardous to human health even at trace levels. This leads to the requirement of fast, accurate and reliable techniques for the detection of heavy metal ions. This review presents various electrochemical detection techniques for heavy metal ions those are user friendly, low cost, provides on-site and real time monitoring as compared to other spectroscopic and optical techniques...
March 18, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28340462/assessment-of-arsenic-and-fluorine-in-surface-soil-to-determine-environmental-and-health-risk-factors-in-the-comarca-lagunera-mexico
#11
Yareli A Sariñana-Ruiz, Jorge Vazquez-Arenas, Fabiola S Sosa-Rodríguez, Israel Labastida, Ma Aurora Armienta, Antonio Aragón-Piña, Miguel A Escobedo-Bretado, Laura S González-Valdez, Patricia Ponce-Peña, Hugo Ramírez-Aldaba, René H Lara
Total, bioaccessible and mobile concentrations of arsenic and fluorine are determined in polluted surface soil within the Comarca Lagunera region using standardized protocols to obtain a full description of the environmental behavior for these elements. The composition of mineral phases associated with them is evaluated with microscopic and spectroscopic techniques. Mineralogical characterizations indicate that ultra-fine particles (<1-5 μm) including mimetite-vanadite (Pb5(AsO4)3Cl, Pb5(AsO4, VO4)3Cl)-like, lead arseniate (Pb3(AsO4)2)-like and complex arsenic-bearing compounds are main arsenic-bearing phases, while fluorite (CaF2) is the only fluorine-bearing phase...
March 10, 2017: Chemosphere
https://www.readbyqxmd.com/read/28340032/osptr7-osnpf8-1-a-putative-peptide-transporter-in-rice-is-involved-in-dimethylarsenate-accumulation-in-rice-grain
#12
Zhong Tang, Yi Chen, Fei Chen, Yuchen Ji, Fang-Jie Zhao
Rice (Oryza sativa) is a major dietary source of arsenic (As) for the population consuming rice as their staple food. Rice grain contains both inorganic As and methylated As species, especially dimethyarsinate (DMA). DMA is highly mobile in long-distance translocation in plants, but the underlying mechanism remains unknown. In the present study, we showed that OsPTR7 (OsNPF8.1), a putative peptide transporter in rice, was permeable to DMA in Xenopus laevis oocytes. Transient expression of the OsPTR7-green fluorescent protein (GFP) in tobacco protoplasts showed that OsPTR7 was localized in the cell plasma membrane...
March 2, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28338629/study-of-the-accumulation-of-toxic-and-essential-ultra-trace-elements-in-fruits-of-sorbus-domestica-l
#13
Michaela Zeiner, Iva Juranović Cindrić, Boris Majić, Gerhard Stingeder
In the present work, the accumulation of selected toxic and essential ultra-trace elements in fruits of service tree (Sorbus domestica L.) were determined depending on harvest time. Samples were collected from the same sampling area in two different years and within one year in September and October (maturity state). Harvesting the fruits in the same area excludes the influence of metals taken up via roots, thus the impact of airborne contamination by heavy metal translocation can be studied. All samples were dried and digested using an acidic microwave assisted digestion system prior to quantification by inductively coupled plasma-sector field mass spectrometry (ICP-SFMS)...
March 24, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28337565/blood-trace-metals-in-a-sporadic-amyotrophic-lateral-sclerosis-geographical-cluster
#14
Stefano De Benedetti, Giorgio Lucchini, Cristian Del Bò, Valeria Deon, Alessandro Marocchi, Silvana Penco, Christian Lunetta, Elisabetta Gianazza, Francesco Bonomi, Stefania Iametti
Amyotrophic lateral sclerosis (ALS) is a fatal disorder with unknown etiology, in which genetic and environmental factors interplay to determine the onset and the course of the disease. Exposure to toxic metals has been proposed to be involved in the etiology of the disease either through a direct damage or by promoting oxidative stress. In this study we evaluated the concentration of a panel of metals in serum and whole blood of a small group of sporadic patients, all living in a defined geographical area, for which acid mine drainage has been reported...
March 23, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28337271/effects-of-long-term-low-and-high-dose-sodium-arsenite-exposure-in-human-transitional-cells
#15
Jianming He, Feng Wang, Fen Luo, Xuedan Chen, Xi Liang, Wenbin Jiang, Zhizhong Huang, Jiafan Lei, Fabo Shan, Xueqing Xu
Epidemiological studies have revealed the association between increased risk of bladder cancer and chronic arsenic exposure. Here, we explored biological effects of arsenic in T24. Microarray analysis was applied to analyze mRNA in T24 following 0, 2 or 5 μM sodium arsenite (As) exposure for 72 hours. Long term (up to 140 days) low-dose (200 nM) and high-dose (1,000 nM) As decreased E-cadherin protein level through different mechanisms because the mRNA levels of E-cadherin increased following low-dose As exposure but decreased following high-dose As exposure...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28337116/assessment-of-usefulness-of-synchrotron-radiation-techniques-to-determine-arsenic-species-in-hair-and-rice-grain-samples
#16
Jun Lin, Guo-Fang Lin, Yu-Lan Li, Xiao-Yan Gao, Hui Du, Chao-Gang Jia, Hong-Chao Lu, Klaus Golka, Jian-Hua Shen
The arseniasis in Southwest Guizhou, China has been identified as a unique case of endemic arseniasis caused by exposure to indoor combustion of high As-content coal. Present investigation targeted the microdistribution and speciation of the element arsenic in human hair and environmental samples collected in one of the hyper-endemic villages of arseniasis in the area. Analyses were performed by micro-beam X-ray fluorescence (μ-XRF) and X-ray absorption fine structure (XAFS). The total As level in hair samples of diagnosed patients was detected at almost the same level as in their asymptomatic neighbors...
2017: EXCLI journal
https://www.readbyqxmd.com/read/28336966/an-integrated-h-g-scheme-identifying-areas-for-soil-remediation-and-primary-heavy-metal-contributors-a-risk-perspective
#17
Bin Zou, Xiaolu Jiang, Xiaoli Duan, Xiuge Zhao, Jing Zhang, Jingwen Tang, Guoqing Sun
Traditional sampling for soil pollution evaluation is cost intensive and has limited representativeness. Therefore, developing methods that can accurately and rapidly identify at-risk areas and the contributing pollutants is imperative for soil remediation. In this study, we propose an innovative integrated H-G scheme combining human health risk assessment and geographical detector methods that was based on geographical information system technology and validated its feasibility in a renewable resource industrial park in mainland China...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28336470/bioassay-guided-isolation-of-active-principles-from-nigerian-medicinal-plants-identifies-new-trypanocides-with-low-toxicity-and-no-cross-resistance-to-diamidines-and-arsenicals
#18
Godwin Unekwuojo Ebiloma, John Ogbaji Igoli, Evangelos Katsoulis, Anne-Marie Donachie, Anthonius Eze, Alexander Ian Gray, Harry P de Koning
ETHNOPHARMACOLOGICAL RELEVANCE: Leaves from the plant species studied herein are traditionally used in northern Nigeria against various protozoan infections. However, none of these herbal preparations have been standardized, nor have their toxicity to mammalian cells been investigated. In search of improved and non-toxic active antiprotozoal principles that are not cross-resistant with current anti-parasitics, we here report the results of the in vitro screening of extracts from seven selected medicinal plant species (Centrosema pubescens, Moringa oleifera, Tridax procumbens, Polyalthia longifolia, Newbouldia laevis, Eucalyptus maculate, Jathropha tanjorensis), used traditionally to treat kinetoplastid infections in Nigeria, and the isolation of their bioactive principles...
March 20, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28336213/transient-and-permanent-changes-in-dna-methylation-patterns-in-inorganic-arsenic-mediated-epithelial-to-mesenchymal-transition
#19
Meredith Eckstein, Matthew Rea, Yvonne N Fondufe-Mittendorf
Chronic low dose inorganic arsenic exposure causes cells to take on an epithelial-to-mesenchymal phenotype, which is a crucial process in carcinogenesis. Inorganic arsenic is not a mutagen and thus epigenetic alterations have been implicated in this process. Indeed, during the epithelial-to-mesenchymal transition, morphologic changes to cells correlate with changes in chromatin structure and gene expression, ultimately driving this process. However, studies on the effects of inorganic arsenic exposure/withdrawal on the epithelial-to-mesenchymal transition and the impact of epigenetic alterations in this process are limited...
March 20, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28336093/concurrent-methylation-and-demethylation-of-arsenic-by-fungi-and-their-differential-expression-in-the-protoplasm-proteome
#20
Shiming Su, Xibai Zeng, Lingyu Bai, Yanan Wang, Lili Zhang, Mansheng Li, Cuixia Wu
Microbial methylation and demethylation are central to arsenic's (As) biogeochemical cycling. Here, the transformations of monomethylarsonic acid (MMA(V)) (50 mg L(-1)) for 15 days in cells of As-methylating fungi, Fusarium oxysporum CZ-8F1, Penicillium janthinellum SM-12F4, and Trichoderma asperellum SM-12F1, were evaluated, and trace concentrations of As(III) and As(V) were observed in fungal cell extracts. Trace amounts of DMA(V) were also detected in MMA(V) and P. janthinellum SM-12F4 incubations. In situ X-ray absorption near edge structure (XANES) indicated that after exposure to MMA(V) (500 mg L(-1)) for 15 days, 28...
March 21, 2017: Environmental Pollution
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