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https://www.readbyqxmd.com/read/29161671/effective-removal-of-hazardous-trace-metals-from-recovery-boiler-fly-ashes
#1
Teemu Kinnarinen, Mohammad Golmaei, Eeva Jernström, Antti Häkkinen
The objective of this study is to introduce a treatment sequence enabling straightforward and effective recovery of hazardous trace elements from recovery boiler fly ash (RBFA) by a novel method, and to demonstrate the subsequent removal of Cl and K with the existing crystallization technology. The treatment sequence comprises two stages: dissolution of most other RBFA components than the hazardous trace elements in water in Step 1 of the treatment, and crystallization of the process chemicals in Step 2. Solid-liquid separation has an important role in the treatment, due to the need to separate first the small solid residue containing the trace elements, and to separate the valuable crystals, containing Na and S, from the liquid rich in Cl and K...
November 18, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29161598/roles-and-potential-mechanisms-of-selenium-in-countering-thyrotoxicity-of-dehp
#2
Pei Zhang, Xie Guan, Min Yang, Li Zeng, Changjiang Liu
Di-(2-ethylhexyl) phthalate (DEHP) as a ubiquitous environmental contaminant could disturb thyroid hormone (TH) homeostasis. Selenium as an essential trace element has protective effects on thyroids. To verify roles of selenium in countering thyrotoxicity of DEHP and elucidate potential mechanisms, Sprague-Dawley rats and Nthy-ori 3-1 cells were treated with DEHP or/and selenomethionine (SeMet). Results showed that selenium supplementation elevated plasma free thyroxine (FT4) that was decreased by DEHP, and free triiodothyronine (FT3) and thyroid stimulating hormone (TSH) levels were also partially recovered...
November 18, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29161267/sugar-industry-sponsorship-of-germ-free-rodent-studies-linking-sucrose-to-hyperlipidemia-and-cancer-an-historical-analysis-of-internal-documents
#3
Cristin E Kearns, Dorie Apollonio, Stanton A Glantz
In 1965, the Sugar Research Foundation (SRF) secretly funded a review in the New England Journal of Medicine that discounted evidence linking sucrose consumption to blood lipid levels and hence coronary heart disease (CHD). SRF subsequently funded animal research to evaluate sucrose's CHD risks. The objective of this study was to examine the planning, funding, and internal evaluation of an SRF-funded research project titled "Project 259: Dietary Carbohydrate and Blood Lipids in Germ-Free Rats," led by Dr. W...
November 2017: PLoS Biology
https://www.readbyqxmd.com/read/29160564/functional-differences-in-transport-properties-of-natural-hkt1-1-variants-influence-shoot-na-exclusion-in-grapevine-rootstocks
#4
Sam W Henderson, Jake D Dunlevy, Yue Wu, Deidre H Blackmore, Rob R Walker, Everard J Edwards, Matthew Gilliham, Amanda R Walker
Under salinity, Vitis spp. rootstocks can mediate salt (NaCl) exclusion from grafted V. vinifera scions enabling higher grapevine yields and production of superior wines with lower salt content. Until now, the genetic and mechanistic elements controlling sodium (Na(+) ) exclusion in grapevine were unknown. Using a cross between two Vitis interspecific hybrid rootstocks, we mapped a dominant quantitative trait locus (QTL) associated with leaf Na(+) exclusion (NaE) under salinity stress. The NaE locus encodes six high-affinity potassium transporters (HKT)...
November 21, 2017: New Phytologist
https://www.readbyqxmd.com/read/29159470/biogeochemical-assessment-of-the-urban-area-in-moscow
#5
Vadim Ermakov, Leonid Perelomov, Sabsbakhor Khushvakhtova, Sergey Tyutikov, Valentina Danilova, Vladimir Safonov
The biogeochemical and ecological assessment of the industrial city territory including urban soils and trees was carried out. Chemical (macroelement and microelement) composition of the city soils, morphological and biochemical properties of the linden leaves, possible impact of de-icing salts on soil and tree state, the correlation between the content of trace elements, and the S-containing plant compounds (phytochelatins) were included in the assessment. It was found that concentrations of trace elements in the soils near road with intensive traffic are changed from the soils, located at a distance of 40-50 m from the road...
November 21, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29158115/trace-elements-cause-oxidative-damage-in-the-brain-of-rats-with-induced-hypotension
#6
David Calderón Guzmán, Maribel Ortiz Herrera, Norma Osnaya Brizuela, Gerardo Barragán Mejía, Hugo Juárez Olguín, Armando Valenzuela Peraza
Hypertension causes neuronal damage and apoptosis in the brain. Diazoxide is a drug used in the treatment of hypertension however, its effect on 5-hydroxyindole acetic acid (5-HIAA) and dopamine amines in adult animal models remains unclear. The purpose of this study was to determine the effect of oligoelements on 5-HIAA and dopamine in the brain of adult rats treated with diazoxide METHODS: Male Fisher rats (weight 250g) were treated as follows: Group I, NaCl 0.9% (control); group II, tracefusin® (1.5mL/rat); group III, diazoxide (20mg/rat) and group IV, tracefusin® (1...
November 3, 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/29157209/transcriptome-sequencing-and-analysis-of-zinc-uptake-related-genes-in-trichophyton-mentagrophytes
#7
Xinke Zhang, Pengxiu Dai, Yongping Gao, Xiaowen Gong, Hao Cui, Yipeng Jin, Yihua Zhang
BACKGROUND: Trichophyton mentagrophytes is an important zoonotic dermatophytic (ringworm) pathogen; causing severe skin infection in humans and other animals worldwide. Fortunately, commonly used fungal skin disease prevention and treatment measures are relatively simple. However, T. mentagrophytes is primarily studied at the epidemiology and drug efficacy research levels, yet current study has been unable to meet the needs of clinical medicine. Zinc is a crucial trace element for the growth and reproduction of fungi and other microorganisms...
November 21, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29156387/biotransformation-and-detoxification-of-selenite-by-microbial-biogenesis-of-selenium-sulfur-nanoparticles
#8
M Vogel, S Fischer, A Maffert, R Hübner, A C Scheinost, C Franzen, R Steudtner
This study combines the interaction between the toxic oxyanions selenite and selenate and the plant growth promoting bacterium Azospirillum brasilense with a comprehensive characterization of the formed selenium particles. As selenium is an essential trace element, but also toxic in high concentrations, its state of occurrence in nature is of major concern. Growth of the bacterium was affected by selenite (1-5mM) only, observable as a prolonged growth lag-phase of 3days. Subsequently, selenite reduction occurred under aerobic conditions resulting in extracellularly formed insoluble Se(0) particles...
October 27, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29156333/short-and-long-term-effects-of-manganese-zinc-and-copper-ions-on-nitrogen-removal-in-nitritation-anammox-process
#9
Huayu Li, Hong Yao, Dayi Zhang, Lushen Zuo, Jia Ren, Jinyuan Ma, Jin Pei, Yaru Xu, Chengyong Yang
This study provided a deep insight into the impacts of trace elements (Mn(2+), Zn(2+) and Cu(2+)) on nitritation-anammox process. For short-term exposure, all the three elements could improve the nitrogen removal rate (NRR) and the optimal concentrations were 2.0 mg/L, 2.0 mg/L and 0.5 mg/L for Mn(2+), Zn(2+) and Cu(2+), respectively. Accordingly, the NRRs were enhanced 54.62%, 45.93% and 44.09%. The long-term experiments were carried out in lab-scale sequencing batch reactors. The surprising results showed that only Mn(2+) addition could enhance the long-term nitritation-anammox process, and the NRR increased from 0...
November 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/29156288/determination-and-validation-of-soil-thresholds-for-cadmium-based-on-food-quality-standard-and-health-risk-assessment
#10
Changfeng Ding, Yibing Ma, Xiaogang Li, Taolin Zhang, Xingxiang Wang
Cadmium (Cd) is an environmental toxicant with high rates of soil-plant transfer. It is essential to establish an accurate soil threshold for the implementation of soil management practices. This study takes root vegetable as an example to derive soil thresholds for Cd based on the food quality standard as well as health risk assessment using species sensitivity distribution (SSD). A soil type-specific bioconcentration factor (BCF, ratio of Cd concentration in plant to that in soil) generated from soil with a proper Cd concentration gradient was calculated and applied in the derivation of soil thresholds instead of a generic BCF value to minimize the uncertainty...
November 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29156266/seabirds-as-regional-biomonitors-of-legacy-toxicants-on-an-urbanized-coastline
#11
Corey A Clatterbuck, Rebecca L Lewison, Nathan G Dodder, Catherine Zeeman, Kenneth Schiff
Seabirds are often cited as sentinels of the marine environment, but are rarely used in traditional ocean and coastal contaminant monitoring. Four classes of persistent organic pollutants (POPs, n=68) and three trace elements (mercury, selenium, and arsenic) were measured in the eggs of California least terns (Sterna antillarum browni), caspian terns (Hydroprogne caspia), double-crested cormorants (Phalacrocorax auritus), and western gulls (Larus occidentalis) that nest in the Southern California Bight. Building on a periodic five year regional monitoring program, we measured contaminant exposure and assessed the utility of seabirds as regional contaminant biomonitors...
November 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29154121/trace-elements-in-the-liver-of-captive-and-free-ranging-european-bison-bison-bonasus-l
#12
Maciej Durkalec, Agnieszka Nawrocka, Michał Krzysiak, Magdalena Larska, Mirosława Kmiecik, Andrzej Posyniak
European bison is classified as a vulnerable species because of many threats. We analyzed the content of toxic and essential elements (Ag, Al, As, Ba, Be, Cd, Co, Cr, Cu, Hg, Mg, Mn, Na, Ni, Pb, Se, Th, Tl, U, V, and Zn) in the livers of 30 captive and free-ranging European bison from the Bison Breeding Center in Smardzewice and from Białowieża Primeval Forest in Poland. The contents of toxic elements were lower than reported previously in European Bison and were similar to those of wild ungulates from non-polluted areas...
November 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/29153892/penalized-estimation-of-sparse-concentration-matrices-based-on-prior-knowledge-with-applications-to-placenta-elemental-data
#13
Jai Woo Lee, Tracy Punshon, Erika L Moen, Margaret R Karagas, Jiang Gui
Identifying patterns of association or dependency among high-dimensional biological datasets with sparse precision matrices remains a challenge. In this paper, we introduce a weighted sparse Gaussian graphical model that can incorporate prior knowledge to infer the structure of the network of trace element concentrations, including essential elements as well as toxic metals and metaloids measured in the human placentas. We present the weighted L1 penalized regularization procedure for estimating the sparse precision matrix in the setting of Gaussian graphical models...
November 4, 2017: Computational Biology and Chemistry
https://www.readbyqxmd.com/read/29153878/extensive-processing-of-sediment-pore-water-dissolved-organic-matter-during-anoxic-incubation-as-observed-by-high-field-mass-spectrometry-fticr-ms
#14
Juliana Valle, Michael Gonsior, Mourad Harir, Alex Enrich-Prast, Philippe Schmitt-Kopplin, David Bastviken, Ralf Conrad, Norbert Hertkorn
Dissolved organic matter (DOM) contained in lake sediments is a carbon source for many microbial degradation processes, including aerobic and anaerobic mineralization. During anaerobic degradation, DOM is partially consumed and transformed into new molecules while the greenhouse gases methane (CH4) and carbon dioxide (CO2) are produced. In this study, we used ultrahigh resolution mass spectrometry to trace differences in the composition of solid-phase extractable (PPL resin) pore water DOM (SPE-DOM) isolated from surface sediments of three boreal lakes before and after 40 days of anoxic incubation, with concomitant determination of CH4 and CO2 evolution...
November 7, 2017: Water Research
https://www.readbyqxmd.com/read/29153083/behavior-and-kinetic-of-hydrolysis-of-amine-boranes-in-acid-media-employed-in-chemical-vapor-generation
#15
Lucia D'Ulivo, Roberto Spiniello, Massimo Onor, Beatrice Campanella, Zoltan Mester, Alessandro D'Ulivo
The behavior of NaBH4 (THB) and the amine boranes, NH3BH3 (AB), tertbutylNH2BH3 (TBAB), Me2NHBH3 (DMAB) was investigated in continuous flow chemical vapor generation of H2Se from aqueous Se(IV) coupled with atomic absorption spectrometry. Unexpected higher efficiency of H2Se generation was obtained with amine boranes compared to THB (TBAB > AB > THB) using millimolar concentration of reductant (0.001-0.1 mol L(-1)) under strongly acidic conditions (HCl, HClO4, H2SO4, HNO3, 0.5-5 mol L(-1) H(+))...
January 15, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29151407/minerals-and-trace-elements-in-milk-milk-products-infant-formula-and-adult-pediatric-nutritional-formula-icp-ms-method-collaborative-study-aoac-final-action-2015-06-iso-dis-21424-idf-243
#16
Lawrence H Pacquette, Joseph J Thompson
AOAC Final Action Official Method(SM)2015.06 “Minerals and Trace Elements in Milk, Milk Products, Infant Formula and Adult/Pediatric Nutritional Formula, ICP-MS Method” was collaboratively studied. Note that “milk, milk products” has now been added to the title of the Final Action method because whole milk and several dairy ingredients were successfully incorporated into the collaborative study for the purpose of developing an International Organization for Standardization/International Dairy Federation standard (ISO/DIS 21424; in progress)...
November 20, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/29151188/dry-flue-gas-desulfurization-by-product-application-effects-on-plant-uptake-and-soil-storage-changes-in-a-managed-grassland
#17
Jason R Burgess-Conforti, Kristofor R Brye, David M Miller, Erik D Pollock, Lisa S Wood
Environmental regulations mandate that sulfur dioxide (SO2) be removed from the flue gases of coal-fired power plants, which results in the generation of flue gas desulfurization (FGD) by-products. These FGD by-products may be a viable soil amendment, but the large amounts of trace elements contained in FGD by-products are potentially concerning. The objective of this study was to evaluate the effects of land application of a high-Ca dry FGD (DFGD) by-product on trace elements in aboveground biomass and soil...
November 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29150949/chromium-hazard-and-risk-assessment-new-insights-from-a-detailed-speciation-study-in-a-standard-test-medium
#18
Imad Aharchaou, Jean-Sebastien Py, Sebastien Cambier, Jean-Luc Loizeau, Geert Cornelis, Philippe Rousselle, Eric Battaglia, Davide A L Vignati
Despite the consensus about the importance of chemical speciation in controlling the bioavailability and ecotoxicity of trace elements, detailed speciation studies during laboratory ecotoxicity testing remain scarce, contributing to uncertainty when extrapolating laboratory findings to real field situations in risk assessment. We characterized the speciation and ecotoxicological effects of Cr(III) and Cr(VI) in the ISO medium for algal ecotoxicity testing. Total and dissolved (<0.22 μm) Cr concentrations showed little variability in media spiked with Cr(VI) , while dissolved Cr concentration decreased by as much as 80% over 72 hours in medium amended with Cr(III) ...
November 18, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29150755/comparative-hair-trace-element-profile-in-the-population-of-sakhalin-and-taiwan-pacific-islands
#19
Anatoly V Skalny, Margarita G Skalnaya, Eugeny P Serebryansky, Irina V Zhegalova, Andrei R Grabeklis, Oxana A Skalnaya, Anastasia A Skalnaya, Pai-Tsang Huang, Cheng-Chi Wu, Anatoly T Bykov, Alexey A Tinkov
The objective of the current study is to perform a comparative analysis of hair trace element content in 393 apparently healthy adults living in Taipei, Taiwan, Republic of China (94 women and 46 men) and Yuzhno-Sakhalinsk, Sakhalin, Russia (186 women and 67 men). The obtained data indicate that Yuzhno-Sakhalinsk inhabitants were characterized by significantly higher hair Co, Cr, Mn, and V levels, exceeding the respective Taipei values by a factor of 3, 2, 7, and 5, respectively (all p < 0.001). Hair Cu, Fe, and Si levels were also higher in examinees from Yuzhno-Sakhalinsk than those from Taipei by 10% (p = 0...
November 17, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/29150339/hair-concentration-of-trace-elements-and-growth-in-homeless-children-aged-6years-results-from-the-enfams-study
#20
Lucia Fábelová, Stéphanie Vandentorren, Cécile Vuillermoz, Robert Garnier, Sandrine Lioret, Jérémie Botton
BACKGROUND: Growth is an important indicator of health in early childhood. This is a critical developmental period, during which a number of factors, including exposure to metals, might play a role in later physical and metabolic functions. OBJECTIVE: To study the association between exposure to arsenic (As), cadmium (Cd), mercury (Hg), lead (Pb) and selenium (Se), and physical growth of children from homeless families aged <6years. METHODS: This study was based on data of the cross-sectional survey (ENFAMS), which was conducted by the Observatoire du Samu Social on a random sample of homeless sheltered families in the Paris region during winter 2013...
November 14, 2017: Environment International
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