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https://www.readbyqxmd.com/read/28800485/validation-of-site-specific-soil-ni-toxicity-thresholds-with-independent-ecotoxicity-and-biogeochemistry-data-for-elevated-soil-ni
#1
Beverley Hale, Yamini Gopalapillai, Amanda Pellegrino, Tyson Jennett, Julie Kikkert, Wilson Lau, Christian Schlekat, Mike J McLaughlin
The Existing Substances Regulation Risk Assessments by the European Union (EU RA) generated new toxicity data for soil organisms exposed to Ni added to sixteen field-collected soils with low background concentration of metals and varying physico-chemical soil characteristics. Using only effective cation exchange capacity (eCEC) as a bioavailability correction, chronic toxicity of Ni in soils with a wide range of characteristics could be predicted within a factor of two. The objective of the present study was to determine whether this was also the case for three independent data sets of Ni toxicity thresholds...
August 8, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28782919/subcatchment-deltas-and-upland-features-influence-multiscale-aquatic-ecosystem-recovery-in-damaged-landscapes
#2
Brian W Kielstra, Shelley E Arnott, John M Gunn
Assessing biological recovery in damaged aquatic environments requires the consideration of multiple spatial and temporal scales. Past research has focused on assessing lake recovery from atmospheric or catchment disturbance at regional or catchment levels. Studies have also rarely considered the influences of adjacent terrestrial characteristics on within-lake habitats, such as subcatchment delta confluences. We used Hyalella azteca, a ubiquitous freshwater amphipod, as a sensitive indicator to assess the importance of local subcatchment scale factors in the context of multiscale lake recovery within the metal mining region of Sudbury, Canada following a period of major reductions in atmospheric pollution...
August 7, 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28723273/the-repair-project-examining-the-biological-impacts-of-sub-background-radiation-exposure-within-snolab-a-deep-underground-laboratory
#3
Christopher Thome, Sujeenthar Tharmalingam, Jake Pirkkanen, Andrew Zarnke, Taylor Laframboise, Douglas R Boreham
Considerable attention has been given to understanding the biological effects of low-dose ionizing radiation exposure at levels slightly above background. However, relatively few studies have been performed to examine the inverse, where natural background radiation is removed. The limited available data suggest that organisms exposed to sub-background radiation environments undergo reduced growth and an impaired capacity to repair genetic damage. Shielding from background radiation is inherently difficult due to high-energy cosmic radiation...
July 19, 2017: Radiation Research
https://www.readbyqxmd.com/read/28672235/geochemistry-and-toxicity-of-a-large-slag-pile-and-its-drainage-complex-in-sudbury-ontario
#4
Laura Souter, Shaun A Watmough
Slag piles from mining activities are common worldwide, but in contrast to mine tailings the environmental impact of runoff from slag piles is less documented. This study was designed to assess the geochemistry and potential toxicity of water draining a large, 62.2ha slag pile in Sudbury, Ontario. The Coniston slag pile contains 12-20Mt of slag from smelting local Ni-Cu ore between 1913 and 1972. Slag leaching experiments confirmed slag is a source of sulphate (SO4), heavy metals (including Fe, Al, Ni, Co, Cu, Zn, Pb, Cr, Mn) and base cations (Ca, K, Mg, Na)...
December 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28548083/atomic-scale-age-resolution-of-planetary-events
#5
L F White, J R Darling, D E Moser, D A Reinhard, T J Prosa, D Bullen, D Olson, D J Larson, D Lawrence, I Martin
Resolving the timing of crustal processes and meteorite impact events is central to understanding the formation, evolution and habitability of planetary bodies. However, identifying multi-stage events from complex planetary materials is highly challenging at the length scales of current isotopic techniques. Here we show that accurate U-Pb isotopic analysis of nanoscale domains of baddeleyite can be achieved by atom probe tomography. Within individual crystals of highly shocked baddeleyite from the Sudbury impact structure, three discrete nanostructural domains have been isolated yielding average (206)Pb/(238)U ages of 2,436±94 Ma (protolith crystallization) from homogenous-Fe domains, 1,852±45 Ma (impact) from clustered-Fe domains and 1,412±56 Ma (tectonic metamorphism) from planar and subgrain boundary structures...
May 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28512081/effects-of-ehealth-literacy-on-general-practitioner-consultations-a-mediation-analysis
#6
Peter Johannes Schulz, Mary Anne Fitzpatrick, Alexandra Hess, Lynn Sudbury-Riley, Uwe Hartung
BACKGROUND: Most evidence (not all) points in the direction that individuals with a higher level of health literacy will less frequently utilize the health care system than individuals with lower levels of health literacy. The underlying reasons of this effect are largely unclear, though people's ability to seek health information independently at the time of wide availability of such information on the Internet has been cited in this context. OBJECTIVE: We propose and test two potential mediators of the negative effect of eHealth literacy on health care utilization: (1) health information seeking and (2) gain in empowerment by information seeking...
May 16, 2017: Journal of Medical Internet Research
https://www.readbyqxmd.com/read/28462447/predictive-power-of-the-nsqip-risk-calculator-for-early-post-operative-outcomes-after-whipple-experience-from-a-regional-center-in-northern-ontario
#7
Henry Y Jiang, Erica L Kohtakangas, Kengo Asai, Jeffrey B Shum
BACKGROUND: NSQIP Risk Calculator was developed to allow surgeons to inform their patients about their individual risks for surgery. Its ability to predict complication rates and length of stay (LOS) has made it an appealing tool for both patients and surgeons. However, the NSQIP Risk Calculator has been criticized for its generality and lack of detail towards surgical subspecialties, including the hepatopancreaticobiliary (HPB) surgery. We wish to determine whether the NSQIP Risk Calculator is predictive of post-operative complications and LOS with respect to Whipple's resections for our patient population...
May 2, 2017: Journal of Gastrointestinal Cancer
https://www.readbyqxmd.com/read/28273623/changes-in-enzymatic-activities-in-metal-contaminated-and-reclaimed-lands-in-northern-ontario-canada
#8
Ramya Narendrula-Kotha, Kabwe K Nkongolo
Metal and sulfur dioxide (SO2) contaminations in Northern Ontario (Canada), especially in the Greater Sudbury Region (GSR) caused by mining activities have resulted in severe environmental degradations. A long term restoration program has led to significant landscape changes and healthy ecosystems. The objective of this study was to assess variation in enzymatic activities and soil respiration in metal contaminated and reclaimed ecosystems. Soil analysis revealed that respiration rates were higher in metal contaminated limed soils (65ppm) compared to adjacent unlimed areas (35ppm)...
June 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28242590/exploring-the-measurement-properties-of-the-ehealth-literacy-scale-eheals-among-baby-boomers-a-multinational-test-of-measurement-invariance
#9
Lynn Sudbury-Riley, Mary FitzPatrick, Peter J Schulz
BACKGROUND: The eHealth Literacy Scale (eHEALS) is one of only a few available measurement scales to assess eHealth literacy. Perhaps due to the relative paucity of such measures and the rising importance of eHealth literacy, the eHEALS is increasingly a choice for inclusion in a range of studies across different groups, cultures, and nations. However, despite its growing popularity, questions have been raised over its theoretical foundations, and the factorial validity and multigroup measurement properties of the scale are yet to be investigated fully...
February 27, 2017: Journal of Medical Internet Research
https://www.readbyqxmd.com/read/28204976/variation-in-whole-dna-methylation-in-red-maple-acer-rubrum-populations-from-a-mining-region-association-with-metal-contamination-and-cation-exchange-capacity-cec-in-podzolic-soils
#10
K N Kalubi, M Mehes-Smith, G Spiers, A Omri
Although a number of publications have provided convincing evidence that abiotic stresses such as drought and high salinity are involved in DNA methylation reports on the effects of metal contamination, pH, and cation exchange on DNA modifications are limited. The main objective of the present study is to determine the relationship between metal contamination and Cation exchange capacity (CEC) on whole DNA modifications. Metal analysis confirms that nickel and copper are the main contaminants in sampled sites within the Greater Sudbury Region (Ontario, Canada) and liming has increased soil pH significantly even after 30 years following dolomitic limestone applications...
April 2017: Ecotoxicology
https://www.readbyqxmd.com/read/27268254/nonrespiratory-mortality-and-cancer-incidence-in-a-cohort-of-canadian-nickel-workers
#11
Nancy E Lightfoot, Colin J Berriault, Steven K Seilkop, Bruce R Conard
Mortality and cancer incidence were examined for an updated cohort of nonsinter nickel workers in Sudbury and Port Colborne, Ontario, Canada. Abstract results are provided for those with ≥ 15 years since first exposure. For circulatory disease mortality, significant elevations were observed overall in many Sudbury work areas and in Port Colborne staff. Underground miners, with first exposure before 1960, displayed significant elevations for pneumoconiosis, as well as silicosis and anthrasilicosis, likely due to crystalline silica...
July 4, 2017: Archives of Environmental & Occupational Health
https://www.readbyqxmd.com/read/27230027/nickel-and-copper-toxicity-and-plant-response-mechanisms-in-white-birch-betula-papyrifera
#12
Gabriel Theriault, Kabwe Nkongolo
Nickel (Ni) and copper (Cu) are the most prevalent metals found in the soils in the Greater Sudbury Region (Canada) because of smelting emissions. The main objectives of the present study were to (1) determine the toxicity of nickel (Ni) and copper (Cu) at different doses in Betula papyrifera (white birch), (2) Characterize nickel resistance mechanism, and (3) assess segregating patterns for Ni and Cu resistance in B. papyrifera populations. This study revealed that B. papyrifera is resistant to Ni and Cu concentrations equivalent to the levels reported in metal-contaminated stands in the GSR...
August 2016: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/27131821/hepatic-oxidative-stress-and-metal-subcellular-partitioning-are-affected-by-selenium-exposure-in-wild-yellow-perch-perca-flavescens
#13
Dominic E Ponton, Antoine Caron, Landis Hare, Peter G C Campbell
Yellow perch (Perca flavescens) collected from 11 lakes in the Canadian mining regions of Sudbury (Ontario) and Rouyn-Noranda (Quebec) display wide ranges in the concentrations of cadmium (Cd), nickel (Ni), selenium (Se), and thallium (Tl) in their livers. To determine if these trace elements, as well as copper (Cu) and zinc (Zn), are causing oxidative stress in these fish, we measured three biochemical indicators (glutathione (GSH), glutathione disulfide (GSSG) and thiobarbituric acid-reactive substances (TBARS)) in their livers...
July 2016: Environmental Pollution
https://www.readbyqxmd.com/read/26928564/multi-dimensional-water-quality-assessment-of-an-urban-drinking-water-source-elucidated-by-high-resolution-underwater-towed-vehicle-mapping
#14
Alan Lock, Graeme Spiers, Blair Hostetler, James Ray, Dirk Wallschläger
Spatial surveys of Ramsey Lake, Sudbury, Ontario water quality were conducted using an innovative underwater towed vehicle (UTV) equipped with a multi-parameter probe providing real-time water quality data. The UTV revealed underwater vent sites through high resolution monitoring of different spatial chemical characteristics using common sensors (turbidity, chloride, dissolved oxygen, and oxidation/reduction sensors) that would not be feasible with traditional water sampling methods. Multi-parameter probe vent site identification is supported by elevated alkalinity and silica concentrations at these sites...
April 15, 2016: Water Research
https://www.readbyqxmd.com/read/26785376/similar-spectral-power-densities-within-the-schumann-resonance-and-a-large-population-of-quantitative-electroencephalographic-profiles-supportive-evidence-for-koenig-and-pobachenko
#15
Kevin S Saroka, David E Vares, Michael A Persinger
In 1954 and 1960 Koenig and his colleagues described the remarkable similarities of spectral power density profiles and patterns between the earth-ionosphere resonance and human brain activity which also share magnitudes for both electric field (mV/m) and magnetic field (pT) components. In 2006 Pobachenko and colleagues reported real time coherence between variations in the Schumann and brain activity spectra within the 6-16 Hz band for a small sample. We examined the ratios of the average potential differences (~3 μV) obtained by whole brain quantitative electroencephalography (QEEG) between rostral-caudal and left-right (hemispheric) comparisons of 238 measurements from 184 individuals over a 3...
2016: PloS One
https://www.readbyqxmd.com/read/26473705/the-impact-of-drought-and-air-pollution-on-metal-profiles-in-peat-cores
#16
Laura Souter, Shaun A Watmough
Peat cores have long been used to reconstruct atmospheric metal deposition; however, debate remains regarding how well historical depositional patterns are preserved in peat. This study examined peat cores sampled from 14 peatlands in the Sudbury region of Ontario, Canada, which has a well-documented history of acid and metal deposition. Copper (Cu) and lead (Pb) concentrations within individual peat cores were strongly correlated and were elevated in the upper 10 cm, especially in the sites closest to the main Copper Cliff smelter...
January 15, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/26274843/metabolomics-confirms-that-dissolved-organic-carbon-mitigates-copper-toxicity
#17
Nadine S Taylor, Jennifer A Kirwan, Norman D Yan, Mark R Viant, John M Gunn, James C McGeer
Reductions in atmospheric emissions from the metal smelters in Sudbury, Canada, produced major improvements in acid and metal contamination of local lakes and indirectly increased dissolved organic carbon (DOC) concentrations. Metal toxicity, however, has remained a persistent problem for aquatic biota. Integrating high-throughput, nontargeted mass spectrometry metabolomics with conventional toxicological measures elucidated the mediating effects of dissolved organic matter (DOM) on the toxicity of Cu to Daphnia pulex-pulicaria, a hybrid isolated from these soft water lakes...
March 2016: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/26236355/antimicrobial-susceptibility-of-canadian-isolates-of-helicobacter-pylori-in-northeastern-ontario
#18
Nelson F Eng, Gustavo Ybazeta, Katrina Chapman, Nya L Fraleigh, Rebecca Letto, Eleonora Altman, Francisco Diaz-Mitoma
BACKGROUND: Helicobacter pylori plays a significant role in gastritis and ulcers. It is a carcinogen as defined by the WHO, and infection can result in adenocarcinomas and mucosa-associated lymphoid tissue lymphomas. In Canada, rates of antimicrobial resistance are relatively unknown, with very few studies conducted in the past 15 years. OBJECTIVE: To examine rates of resistance in Sudbury, Ontario, compare antimicrobial susceptibility methods and attempt to determine the molecular basis of antibiotic resistance...
May 2015: Canadian Journal of Infectious Diseases & Medical Microbiology
https://www.readbyqxmd.com/read/26160672/factors-controlling-peat-chemistry-and-vegetation-composition-in-sudbury-peatlands-after-30-years-of-pollution-emission-reductions
#19
Sophie E Barrett, Shaun A Watmough
The objective of this research was to assess factors controlling peat and plant chemistry, and vegetation composition in 18 peatlands surrounding Sudbury after more than 30 years of large (>95%) pollution emission reductions. Sites closer to the main Copper Cliff smelter had more humified peat and the surface horizons were greatly enriched in copper (Cu) and nickel (Ni). Copper and Ni concentrations in peat were significantly correlated with that in the plant tissue of Chamaedaphne calyculata. The pH of peat was the strongest determining factor for species richness, diversity, and community composition, although percent vascular plant cover was strongly negatively correlated with surface Cu and Ni concentrations in peat...
November 2015: Environmental Pollution
https://www.readbyqxmd.com/read/26020463/using-sulfur-stable-isotopes-to-understand-feeding-behavior-and-selenium-concentrations-in-yellow-perch-perca-flavescens
#20
Dominic E Ponton, Landis Hare
We measured selenium (Se) concentrations in yellow perch (Perca flavescens) muscle and their prey collected from four Se-contaminated lakes located near metal smelters in the eastern Canadian cities of Sudbury and Rouyn-Noranda. Yellow perch Se concentrations were related to their weight in two of the four lakes. Measurements of sulfur stable isotopes (δ(34)S) in yellow perch muscle and stomach contents showed that larger fish tended to feed less on zooplankton and more on benthic invertebrates than did smaller fish...
July 7, 2015: Environmental Science & Technology
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