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https://www.readbyqxmd.com/read/28303615/rare-earth-elements-and-select-actinoids-in-the-canadian-house-dust-study
#1
Pat E Rasmussen, Christine Levesque, Marc Chénier, H David Gardner
Nationally representative baseline data are presented for rare earth elements (REE), plus thorium (Th) and uranium (U) in house dust sampled from 1025 urban homes, in units of concentrations (μg g(-1) ), loadings (μg m(-2) ) and loading rates (ng m(-2) day(-1) ). Spearman rank correlations indicate that, in addition to outdoor sources, consumer products and building materials can influence indoor dust concentrations of REE, Th and U. Correlations (p <0.01) with numbers of occupants, dogs and cats suggest soil track-in...
March 17, 2017: Indoor Air
https://www.readbyqxmd.com/read/28187382/adsorption-of-natural-organic-matter-and-disinfection-byproduct-precursors-from-surface-water-onto-tio2-nanoparticles-ph-effects-isotherm-modelling-and-implications-for-using-tio2-for-drinking-water-treatment
#2
Stephanie L Gora, Susan A Andrews
Titanium dioxide is a photocatalyst that can remove organic contaminants of interest to the drinking water treatment industry, including natural organic matter (NOM) and disinfection byproduct (DBP) precursors. The photocatalytic reaction occurs in two steps: adsorption of the contaminant followed by degradation of the adsorbed contaminant upon irradiation with UV light. The second part of this process can lead to the formation of reactive intermediates and negative impacts on treated water quality, such as increased DBP formation potential (DBPfp)...
May 2017: Chemosphere
https://www.readbyqxmd.com/read/28040926/a-sparsity-based-iterative-algorithm-for-reconstruction-of-micro-ct-images-from-highly-undersampled-projection-datasets-obtained-with-a-synchrotron-x-ray-source
#3
S Ali Melli, Khan A Wahid, Paul Babyn, David M L Cooper, Varun P Gopi
Synchrotron X-ray Micro Computed Tomography (Micro-CT) is an imaging technique which is increasingly used for non-invasive in vivo preclinical imaging. However, it often requires a large number of projections from many different angles to reconstruct high-quality images leading to significantly high radiation doses and long scan times. To utilize this imaging technique further for in vivo imaging, we need to design reconstruction algorithms that reduce the radiation dose and scan time without reduction of reconstructed image quality...
December 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28009575/medium-energy-microprobe-station-at-the-sxrmb-of-the-cls
#4
Qunfeng Xiao, Aimee Maclennan, Yongfeng Hu, Mark Hackett, Peter Leinweber, Tsun Kong Sham
Micro-XAFS and chemical imaging techniques have been widely applied for studies of heterogeneously distributed systems, mostly in hard X-ray (>5 keV) or in soft X-ray (<1.5 keV) energies. The microprobe endstation of the SXRMB (soft X-ray microcharacterization beamline) at the Canadian Light Source is optimized at the medium energy (1.7-5 keV), and it has been recently commissioned and is available for general users. The technical design and the performance (energy range, beam size and flux) of the SXRMB microprobe are presented...
January 1, 2017: Journal of Synchrotron Radiation
https://www.readbyqxmd.com/read/28002578/linking-the-canadian-community-health-survey-and-the-canadian-mortality-database-an-enhanced-data-source-for-the-study-of-mortality
#5
Claudia Sanmartin, Yves Decady, Richard Trudeau, Abel Dasylva, Michael Tjepkema, Philippe Finès, Rick Burnett, Nancy Ross, Douglas G Manuel
BACKGROUND: This study summarizes the linkage of the Canadian Community Health Survey (CCHS) and the Canadian Mortality Database (CMDB), which was performed to examine relationships between social determinants, health behaviours and mortality in the household population. DATA AND METHODS: The 2000/2001-to-2011 Canadian Community Health Surveys were linked to the 2000-to-2011 CMDB using probabilistic methods based on common identifiers (names, date of birth, postal code and sex) for eligible respondents (85%; n = 614,774)...
December 21, 2016: Health Reports
https://www.readbyqxmd.com/read/27804925/multiple-energy-synchrotron-biomedical-imaging-system
#6
B Bassey, M Martinson, N Samadi, G Belev, C Karanfil, P Qi, D Chapman
A multiple energy imaging system that can extract multiple endogenous or induced contrast materials as well as water and bone images would be ideal for imaging of biological subjects. The continuous spectrum available from synchrotron light facilities provides a nearly perfect source for multiple energy x-ray imaging. A novel multiple energy x-ray imaging system, which prepares a horizontally focused polychromatic x-ray beam, has been developed at the BioMedical Imaging and Therapy bend magnet beamline at the Canadian Light Source...
November 2, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27787256/measuring-the-criticality-of-the-magic-condition-for-a-beam-expanding-monochromator
#7
Mercedes Martinson, Dean Chapman
It has been established that for cylindrically bent crystals the optimal beam characteristics occur when the geometric and single-ray foci are matched. In the beam-expanding monochromator developed for the BioMedical Imaging and Therapy beamlines at the Canadian Light Source, it was unclear how critical this `magic condition' was for preserving the transverse coherence of the beam. A study was conducted to determine whether misalignments away from the ideal conditions would severely affect the transverse coherence of the beam, thereby limiting phase-based imaging techniques...
November 1, 2016: Journal of Synchrotron Radiation
https://www.readbyqxmd.com/read/27687902/do-baby-boomers-use-more-healthcare-services-than-other-generations-longitudinal-trajectories-of-physician-service-use-across-five-birth-cohorts
#8
Mayilee Canizares, Monique Gignac, Sheilah Hogg-Johnson, Richard H Glazier, Elizabeth M Badley
OBJECTIVE: In light of concerns for meeting the provision of healthcare services given the large numbers of ageing baby boomers, we compared the trajectories of primary care and specialist services use across the lifecourse of 5 birth cohorts and examined factors associated with birth cohort differences. DESIGN: Longitudinal panel. SETTING: Canadian National Population Health Survey (1994-2011). POPULATION: Sample of 10 186 individuals aged 20-69 years in 1994-1995 and who were from 5 birth cohorts: Generation X (Gen X; born: 1965-1974), Younger Baby Boomers (born: 1955-1964), Older Baby Boomers (born: 1945-1954), World War II (born: 1935-1944) and pre-World War II (born: 1925-1934)...
2016: BMJ Open
https://www.readbyqxmd.com/read/27453203/bmit-facility-at-the-canadian-light-source-advances-in-x-ray-phase-sensitive-imaging
#9
T W Wysokinski, J P Ianowski, X Luan, G Belev, D Miller, M A Webb, N Zhu, D Chapman
The BioMedical Imaging and Therapy (BMIT) facility [1,2] located at the Canadian Light Source, provides synchrotron-specific imaging and radiation therapy capabilities. There are two separate beamlines used for experiments: the bending magnet (05B1-1) and the insertion device (05ID-2) beamline. The bending magnet beamline provides access to monochromatic beam spanning a spectral range of 15-40keV, and the beam is 240mm wide in the POE-2 experimental hutch. Users can also perform experiments with polychromatic (pink) beam...
December 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27320962/three-dimensional-labeling-of-newly-formed-bone-using-synchrotron-radiation-barium-k-edge-subtraction-imaging
#10
Arash Panahifar, Treena M Swanston, M Jake Pushie, George Belev, Dean Chapman, Lynn Weber, David M L Cooper
Bone is a dynamic tissue which exhibits complex patterns of growth as well as continuous internal turnover (i.e. remodeling). Tracking such changes can be challenging and thus a high resolution imaging-based tracer would provide a powerful new perspective on bone tissue dynamics. This is, particularly so if such a tracer can be detected in 3D. Previously, strontium has been demonstrated to be an effective tracer which can be detected by synchrotron-based dual energy K-edge subtraction (KES) imaging in either 2D or 3D...
June 20, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27303896/putative-thioredoxin-trx1-from-thermosipho-africanus-strain-tcf52b-expression-purification-and-structural-determination-using-s-sad
#11
Naheda Sahtout, Jijin R A Kuttiyatveetil, Michel Fodje, David A R Sanders
Thioredoxin is a small ubiquitous protein that plays a role in many biological processes. A putative thioredoxin, Trx1, from Thermosipho africanus strain TCF52B, which has low sequence identity to its closest homologues, was successfully cloned, overexpressed and purified. The protein was crystallized using the microbatch-under-oil technique at 289 K in a variety of conditions; crystals grown in 0.2 M MgCl2, 0.1 M bis-tris pH 6.5, 25%(w/v) PEG 3350, which grew as irregular trapezoids to maximum dimensions of 1...
June 2016: Acta Crystallographica. Section F, Structural Biology Communications
https://www.readbyqxmd.com/read/27140158/synchrotron-radiation-based-x-ray-micro-computed-tomography-reveals-dental-bur-debris-under-dental-composite-restorations
#12
Assem Hedayat, Nicole Nagy, Garnet Packota, Judy Monteith, Darcy Allen, Tomasz Wysokinski, Ning Zhu
Dental burs are used extensively in dentistry to mechanically prepare tooth structures for restorations (fillings), yet little has been reported on the bur debris left behind in the teeth, and whether it poses potential health risks to patients. Here it is aimed to image dental bur debris under dental fillings, and allude to the potential health hazards that can be caused by this debris when left in direct contact with the biological surroundings, specifically when the debris is made of a non-biocompatible material...
May 2016: Journal of Synchrotron Radiation
https://www.readbyqxmd.com/read/27014719/demonstration-of-synchrotron-x-ray-phase-contrast-imaging-computed-tomography-of-infiltrative-transitional-cell-carcinoma-of-the-prostatic-urethra-in-a-dog
#13
James E Montgomery, Michal J Wesolowski, Bailey Wolkowski, Rajni Chibbar, Elisabeth C R Snead, Jaswant Singh, Murray Pettitt, Pritpal S Malhi, Trinita Barboza, Gregg Adams
Prostatic urethral transitional cell carcinoma with prostatic invasion in a dog was imaged with abdominal radiography and abdominal ultrasonography antemortem. Synchrotron in-line x-ray phase contrast imaging computed tomography (XPCI-CT) was performed on the prostate ex vivo at the Canadian Light Source Synchrotron and compared to histology. XPCI-CT imaging provides greater soft tissue contrast than conventional absorption-based x-ray imaging modalities, permitting visualization of regions of inflammatory cell infiltration, differentiation of invasive versus noninvasive tumor regions, and areas of necrosis and mineralization...
January 2016: Journal of Medical Imaging
https://www.readbyqxmd.com/read/26289283/design-of-a-mouse-restraint-for-synchrotron-based-computed-tomography-imaging
#14
Kenneth B Gagnon, Sally Caine, Nazanin Samadi, Mercedes Martinson, Melanie van der Loop, Jane Alcorn, L Dean Chapman, George Belev, Helen Nichol
High-resolution computed tomography (CT) imaging of a live animal within a lead-lined synchrotron light hutch presents several unique challenges. In order to confirm that the animal is under a stable plane of anaesthesia, several physiological parameters (e.g. heart rate, arterial oxygen saturation, core body temperature and respiratory rate) must be remotely monitored from outside the imaging hutch. In addition, to properly scan the thoracic region using CT, the animal needs to be held in a vertical position perpendicular to the fixed angle of the X-ray beam and free to rotate 180°-360°...
September 2015: Journal of Synchrotron Radiation
https://www.readbyqxmd.com/read/26244601/associations-between-added-sugar-solid-vs-liquid-intakes-diet-quality-and-adiposity-indicators-in-canadian-children
#15
JiaWei Wang, Lei Shang, Kelly Light, Jennifer O'Loughlin, Gilles Paradis, Katherine Gray-Donald
Little is known about the influence of different forms of added sugar intake on diet quality or their association with obesity among youth. Dietary intake was assessed by three 24-h recalls in 613 Canadian children (aged 8-10 years). Added sugars (mean of 3-day intakes) were categorized according to source (solid or liquid). Dietary intake and the Canadian Healthy Eating Index (« HEI-C ») were compared across tertiles of solid and liquid added sugars separately as were adiposity indicators (body mass index (BMI), fat mass (dual-energy X-ray absorptiometry), and waist circumference)...
August 2015: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/26134821/assessment-of-freeware-programs-for-the-reconstruction-of-tomography-datasets-obtained-with-a-monochromatic-synchrotron-based-x-ray-source
#16
Bailey Wolkowski, Elisabeth Snead, Michal Wesolowski, Jaswant Singh, Murray Pettitt, Rajni Chibbar, Seyedali Melli, James Montgomery
Synchrotron-based in-line phase-contrast computed tomography (PC-CT) allows soft tissue to be imaged with sub-gross resolution and has potential to be used as a diagnostic tool. The reconstruction and processing of in-line PC-CT datasets is a computationally demanding task; thus, an efficient and user-friendly software program is desirable. Four freeware programs (NRecon, PITRE, H-PITRE and Athabasca Recon) were compared for the availability of features such as dark- and flat-field calibration, beam power normalization, ring artifact removal, and alignment tools for optimizing image quality...
July 2015: Journal of Synchrotron Radiation
https://www.readbyqxmd.com/read/26047232/observation-of-wakefields-and-resonances-in-coherent-synchrotron-radiation
#17
B E Billinghurst, J C Bergstrom, C Baribeau, T Batten, L Dallin, T E May, J M Vogt, W A Wurtz, R Warnock, D A Bizzozero, S Kramer
We report on high resolution measurements of resonances in the spectrum of coherent synchrotron radiation (CSR) at the Canadian Light Source (CLS). The resonances permeate the spectrum at wave number intervals of 0.074  cm(-1), and are highly stable under changes in the machine setup (energy, bucket filling pattern, CSR in bursting or continuous mode). Analogous resonances were predicted long ago in an idealized theory as eigenmodes of a smooth toroidal vacuum chamber driven by a bunched beam moving on a circular orbit...
May 22, 2015: Physical Review Letters
https://www.readbyqxmd.com/read/25931100/phase-preserving-beam-expander-for-biomedical-x-ray-imaging
#18
Mercedes Martinson, Nazanin Samadi, Bassey Bassey, Ariel Gomez, Dean Chapman
The BioMedical Imaging and Therapy beamlines at the Canadian Light Source are used by many researchers to capture phase-based imaging data. These experiments have so far been limited by the small vertical beam size, requiring vertical scanning of biological samples in order to image their full vertical extent. Previous work has been carried out to develop a bent Laue beam-expanding monochromator for use at these beamlines. However, the first attempts exhibited significant distortion in the diffraction plane, increasing the beam divergence and eliminating the usefulness of the monochromator for phase-related imaging techniques...
May 2015: Journal of Synchrotron Radiation
https://www.readbyqxmd.com/read/25876260/sanitary-status-and-incidence-of-methicillin-resistant-staphylococcus-aureus-and-clostridium-difficile-within-canadian-hotel-rooms
#19
Changyun Xu, Scott J Weese, Azadeh Namvar, Keith Warriner
The study described in this article aimed at establishing a baseline assessment of the sanitary status of ice and guest rooms within Canadian hotels. Collectively, 54 hotel rooms belonging to six different national chains were sampled. High-contact surfaces (comforter, alarm clock, bedside lamp, TV remote, bathroom countertop, faucet, and toilet seat) were sampled using adenosine triphosphate (ATP) swabs and replicate organism detection and counting plates. ATP swab readings ranged from 2.12 to 4.42 log relative light units...
April 2015: Journal of Environmental Health
https://www.readbyqxmd.com/read/25528439/injuries-related-to-off-road-vehicles-in-canada
#20
Ward Vanlaar, Heather McAteer, Steve Brown, Jennifer Crain, Steven McFaull, Marisela Mainegra Hing
Off-road vehicles (ORVs; this includes snowmobiles, all-terrain vehicles or ATVs and dirt bikes) were once used primarily for work and travel. Such use remains common in Canada, although their recreational use has also gained popularity in recent years. An epidemiological injury profile of ORV users is important for better understanding injuries and their risk factors to help inform injury prevention initiatives. The Traffic Injury Research Foundation (TIRF) partnered with the Public Health Agency of Canada (PHAC) to analyze the epidemiology of ORV-related injuries...
February 2015: Accident; Analysis and Prevention
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