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https://www.readbyqxmd.com/read/29130421/high-tobacco-use-prevalence-with-significant-regional-and-sex-differences-in-smokeless-tobacco-use-among-western-alaska-native-people-the-watch-study
#1
Kathryn R Koller, Christie A Flanagan, Gretchen E Day, Christi Patten, Jason G Umans, Melissa A Austin, Scarlett E Hopkins, Cheryl Raindl, Bert B Boyer
Tobacco use prevalence among Alaska Native (AN) people living in Alaska is greater than the general population prevalence statewide and nationally. Better understanding of regional tobacco use is needed to improve cessation efforts and reduce prevalence. Using self-reported baseline data from the Western Alaska Tribal Collaborative for Health study, we describe tobacco use patterns among AN people in two western Alaska regions. Data were stratified by age group and sex. Dual- and multi-product use in the Yukon-Kuskokwim (Y-K) region was stratified by concurrent vs sequential use...
2017: International Journal of Circumpolar Health
https://www.readbyqxmd.com/read/28904747/linking-the-wintering-and-breeding-grounds-of-warblers-along-the-pacific-flyway
#2
David P L Toews, Julian Heavyside, Darren E Irwin
Long-distance migration is a behavior that is exhibited by many animal groups. The evolution of novel migration routes can play an important role in range expansions, ecological interactions, and speciation. New migration routes may evolve in response to selection in favor of reducing distance between breeding and wintering areas, or avoiding navigational barriers. Many migratory changes are likely to evolve gradually and are therefore difficult to study. Here, we attempt to connect breeding and wintering populations of myrtle warblers (Setophaga coronata coronata) to better understand the possible evolution of distinct migration routes within this species...
September 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28903976/working-hard-but-working-differently-a-qualitative-study-of-the-impact-of-generational-change-on-rural-health-care
#3
David Snadden, Mark Alexander Kunzli
BACKGROUND: There is limited literature evaluating generational change in the physician workforce and the adjustments required of practices, practitioners and the health care system as a whole. The purpose of this study was to explore rural practitioners' experiences of their current contexts relevant to recruitment and retention and to determine how practices are responding to changing aspirations of new practitioners. METHODS: We used qualitative methods. Participants were selected to ensure diversity of career stage...
September 12, 2017: CMAJ Open
https://www.readbyqxmd.com/read/28841783/zinc-oxide-nanoparticle-toxicity-in-embryonic-zebrafish-mitigation-with-different-natural-organic-matter
#4
Shimaa M Kteeba, Hala I El-Adawi, Osman A El-Rayis, Ahmed E El-Ghobashy, Jessica L Schuld, Kurt R Svoboda, Laodong Guo
Exposure experiments were conducted to evaluate the influence of dissolved organic matter (DOM) on the toxicity of ZnO-NPs (10-30 nm) and dissolved Zn at sub-lethal doses (50 and 5 ppm, respectively) to zebrafish (Danio rerio). Humic acid, alginic acid, bovine serum albumin and various natural DOM isolated from rivers as the Milwaukee River-WI (NOMW), Yukon River-AK (NOMA) and Suwannee River-GA DOM (NOMS) were used to represent humic substances (HA), carbohydrates (CHO), proteins (PTN), and natural organic matter (NOM), respectively...
November 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28817644/cheek-tooth-morphology-and-ancient-mitochondrial-dna-of-late-pleistocene-horses-from-the-western-interior-of-north-america-implications-for-the-taxonomy-of-north-american-late-pleistocene-equus
#5
Christina I Barrón-Ortiz, Antonia T Rodrigues, Jessica M Theodor, Brian P Kooyman, Dongya Y Yang, Camilla F Speller
Horses were a dominant component of North American Pleistocene land mammal communities and their remains are well represented in the fossil record. Despite the abundant material available for study, there is still considerable disagreement over the number of species of Equus that inhabited the different regions of the continent and on their taxonomic nomenclature. In this study, we investigated cheek tooth morphology and ancient mtDNA of late Pleistocene Equus specimens from the Western Interior of North America, with the objective of clarifying the species that lived in this region prior to the end-Pleistocene extinction...
2017: PloS One
https://www.readbyqxmd.com/read/28813532/nitrogen-and-carbon-isotopic-dynamics-of-subarctic-soils-and-plants-in-southern-yukon-territory-and-its-implications-for-paleoecological-and-paleodietary-studies
#6
Farnoush Tahmasebi, Fred J Longstaffe, Grant Zazula, Bruce Bennett
We examine here the carbon and nitrogen isotopic compositions of bulk soils (8 topsoil and 7 subsoils, including two soil profiles) and five different plant parts of 79 C3 plants from two main functional groups: herbs and shrubs/subshrubs, from 18 different locations in grasslands of southern Yukon Territory, Canada (eastern shoreline of Kluane Lake and Whitehorse area). The Kluane Lake region in particular has been identified previously as an analogue for Late Pleistocene eastern Beringia. All topsoils have higher average total nitrogen δ15N and organic carbon δ13C than plants from the same sites with a positive shift occurring with depth in two soil profiles analyzed...
2017: PloS One
https://www.readbyqxmd.com/read/28792470/differential-mechanisms-of-photosynthetic-acclimation-to-light-and-low-temperature-in-arabidopsis-and-the-extremophile-eutrema-salsugineum
#7
Nityananda Khanal, Geoffrey E Bray, Anna Grisnich, Barbara A Moffatt, Gordon R Gray
Photosynthetic organisms are able to sense energy imbalances brought about by the overexcitation of photosystem II (PSII) through the redox state of the photosynthetic electron transport chain, estimated as the chlorophyll fluorescence parameter 1-qL, also known as PSII excitation pressure. Plants employ a wide array of photoprotective processes that modulate photosynthesis to correct these energy imbalances. Low temperature and light are well established in their ability to modulate PSII excitation pressure...
August 9, 2017: Plants (Basel, Switzerland)
https://www.readbyqxmd.com/read/28782008/controlled-hydroxyapatite-biomineralization-in-an-810-million-year-old-unicellular-eukaryote
#8
Phoebe A Cohen, Justin V Strauss, Alan D Rooney, Mukul Sharma, Nicholas Tosca
Biomineralization marks one of the most significant evolutionary milestones among the Eukarya, but its roots in the fossil record remain obscure. We report crystallographic and geochemical evidence for controlled eukaryotic biomineralization in Neoproterozoic scale microfossils from the Fifteenmile Group of Yukon, Canada. High-resolution transmission electron microscopy reveals that the microfossils are constructed of a hierarchically organized interwoven network of fibrous hydroxyapatite crystals each elongated along the [001] direction, indicating biological control over microstructural crystallization...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28745515/hydrology-of-the-north-klondike-river-carbon-export-water-balance-and-inter-annual-climate-influences-within-a-sub-alpine-permafrost-catchment
#9
Anthony Lapp, Ian Clark, Andrew Macumber, Tim Patterson
Arctic and sub-arctic watersheds are undergoing significant changes due to recent climate warming and degrading permafrost, engendering enhanced monitoring of arctic rivers. Smaller catchments provide understanding of discharge, solute flux and groundwater recharge at the process level that contributes to an understanding of how larger arctic watersheds are responding to climate change. The North Klondike River, located in west central Yukon, is a sub-alpine permafrost catchment, which maintains an active hydrological monitoring station with a record of >40 years...
July 26, 2017: Isotopes in Environmental and Health Studies
https://www.readbyqxmd.com/read/28666000/dynamic-wheelchair-seating-positions-impact-cardiovascular-function-after-spinal-cord-injury
#10
Jessica A Inskip, Henrike Rianne J C Ravensbergen, Inderjeet S Sahota, Christine Zawadzki, Lowell T McPhail, Jaimie F Borisoff, Victoria E Claydon
BACKGROUND: Innovative wheelchairs allow individuals to change position easily for comfort and social situations. While these wheelchairs are beneficial in multiple ways, the effects of position changes on blood pressure might exacerbate hypotension and cerebral hypoperfusion, particularly in those with spinal cord injury (SCI) who can have injury to autonomic nerves that regulate cardiovascular control. Conversely, cardiovascular benefits may be obtained with lowered seating. Here we investigate the effect of moderate changes in wheelchair position on orthostatic cardiovascular and cerebrovascular reflex control...
2017: PloS One
https://www.readbyqxmd.com/read/28648995/when-the-ball-is-in-the-female-s-court-how-the-scramble-competition-mating-system-of-the-north-american-red-squirrel-has-shaped-male-physiology-and-testosterone-dynamics
#11
Rudy Boonstra, Adam Dušek, Jeffrey E Lane, Stan Boutin
Male reproductive success in most mammals is determined by their success in direct inter-male competition through aggression and conflict, resulting in female-defense mating systems being predominant. This is linked to male testosterone levels and its dynamics. However, in certain environments, a scramble-competition mating system has evolved, where female reproductive behavior takes precedence and male testosterone dynamics are unlikely to be related to inter-male competition. We studied the North American red squirrel (Tamiasciurus hudsonicus), a species with a well-established scramble-competition system...
October 1, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28598269/cancer-mortality-in-yukon-1999-2013-elevated-mortality-rates-and-a-unique-cancer-profile
#12
Jonathan Simkin, Ryan Woods, Catherine Elliott
BACKGROUND: Although cancer is the leading cause of death in Canada, cancer in the North has been incompletely described. OBJECTIVE: To determine cancer mortality rates in the Yukon Territory, compare them with Canadian rates, and identify major causes of cancer mortality. DESIGN: The Yukon Vital Statistics Registry provided all cancer deaths for Yukon residents between 1999-2013. Age-standardised mortality rates (ASMRs) were calculated using direct standardisation and compared with Canadian rates...
2017: International Journal of Circumpolar Health
https://www.readbyqxmd.com/read/28576137/characteristics-of-patients-receiving-midwife-led-prenatal-care-in-canada-results-from-the-maternity-experiences-survey-mes
#13
Peri Abdullah, Sabrina Gallant, Naseem Saghi, Alison Macpherson, Hala Tamim
BACKGROUND: The aim of this study was to determine the characteristics of women in Canada who received care from a midwife during their prenatal period. METHODS: The findings of this study were drawn from the Maternity Experiences Survey (MES), which was a cross-sectional survey that assessed the experiences of women who gave birth between November 2005 and May 2006. The main outcome variable for this study was the prenatal care provider (i.e. midwife versus other healthcare providers)...
June 2, 2017: BMC Pregnancy and Childbirth
https://www.readbyqxmd.com/read/28437651/population-attributable-risk-associated-with-lung-cancer-induced-by-residential-radon-in-canada-sensitivity-to-relative-risk-model-and-radon-probability-density-function-choices-in-memory-of-professor-jan-m-zielinski
#14
Mo'tassem Al-Arydah
Indoor radon has been identified as the second leading cause of lung cancer after tobacco smoking. The Population Attributable Risk (PAR) estimates the proportion of lung cancer cases associated with indoor radon exposure. Different relative risk (RR) models have been used in the literature to calculate PAR. The aim of this study is to assess how sensitive PAR is to the relative risk model and radon probability distribution functions choices. METHODS: Using Canadian observed first floor radon data collected by Health Canada during the period October 2010 to March 2011, seven common PAR radon models used for North American miners and dwelling scenarios were applied...
April 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28377849/tobacco-use-and-preferences-for-wellness-programs-among-health-aides-and-other-employees-of-an-alaska-native-health-corporation-in-western-alaska
#15
Christi A Patten, Carrie A Bronars, Matthew Scott, Rahnia Boyer, Harry Lando, Matthew M Clark, Kenneth Resnicow, Paul A Decker, Tabetha A Brockman, Agnes Roland, Marcelo Hanza
This study assessed health behaviors and preferences for wellness programs among employees of a worksite serving Alaska Native-people. Village-based Community Health Aides/Practitioners (CHA/Ps) were compared with all other employees on health indicators and program preferences. Using a cross-sectional design, all 1290 employees at the Yukon Kuskokwim Health Corporation (YKHC) in Western Alaska were invited in 2015 to participate in a 30-item online survey. Items assessed health behaviors, perceived stress, resiliency, and preferences for wellness topics and program delivery formats...
June 2017: Preventive Medicine Reports
https://www.readbyqxmd.com/read/28376236/inland-waters-and-their-role-in-the-carbon-cycle-of-alaska
#16
Sarah M Stackpoole, David E Butman, David W Clow, Kristine L Verdin, Benjamin V Gaglioti, Hélène Genet, Robert G Striegl
The magnitude of Alaska (AK) inland waters carbon (C) fluxes is likely to change in the future due to amplified climate warming impacts on the hydrology and biogeochemical processes in high latitude regions. Although current estimates of major aquatic C fluxes represent an essential baseline against which future change can be compared, a comprehensive assessment for AK has not yet been completed. To address this gap, we combined available data sets and applied consistent methodologies to estimate river lateral C export to the coast, river and lake carbon dioxide (CO2 ) and methane (CH4 ) emissions, and C burial in lakes for the six major hydrologic regions in the state...
July 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28353111/the-search-for-an-alternative-to-piped-water-and-sewer-systems-in-the-alaskan-arctic
#17
Korie A Hickel, Aaron Dotson, Timothy K Thomas, Mia Heavener, Jack Hébert, John A Warren
Forty-two communities in rural Alaska are considered unserved or underserved with water and sewer infrastructure. Many challenges exist to provide centralized piped water and sewer infrastructure to the homes, and they are exacerbated by decreasing capital funding. Unserved communities in rural Alaska experience higher rates of disease, supporting the recommendation that sanitation infrastructure should be provided. Organizations are pursuing alternative solutions to conventional piped water and sewer in order to maximize water use and reuse for public health...
March 29, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28289222/fossil-and-genomic-evidence-constrains-the-timing-of-bison-arrival-in-north-america
#18
Duane Froese, Mathias Stiller, Peter D Heintzman, Alberto V Reyes, Grant D Zazula, André E R Soares, Matthias Meyer, Elizabeth Hall, Britta J L Jensen, Lee J Arnold, Ross D E MacPhee, Beth Shapiro
The arrival of bison in North America marks one of the most successful large-mammal dispersals from Asia within the last million years, yet the timing and nature of this event remain poorly determined. Here, we used a combined paleontological and paleogenomic approach to provide a robust timeline for the entry and subsequent evolution of bison within North America. We characterized two fossil-rich localities in Canada's Yukon and identified the oldest well-constrained bison fossil in North America, a 130,000-y-old steppe bison, Bison cf...
March 28, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28264859/physical-activity-and-sedentary-behavior-in-children-with-congenital-heart-disease
#19
Christine Voss, Stephanie L Duncombe, Paige H Dean, Astrid M de Souza, Kevin C Harris
BACKGROUND: Children with congenital heart disease (CHD) are thought to have low levels of physical activity (PA), but few studies have used objective measures of PA in this population. METHODS AND RESULTS: We recruited patients with mild, moderate, and severe CHD and cardiac transplant recipients, aged 8 to 19 years, from pediatric cardiology clinics throughout British Columbia and Yukon, Canada. Participants were fitted with an ActiGraph accelerometer to be worn over the right hip for 7 days...
March 6, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28215068/comprehensive-ms-and-solid-state-nmr-metabolomic-profiling-reveals-molecular-variations-in-native-periderms-from-four-solanum-tuberosum-potato-cultivars
#20
COMPARATIVE STUDY
Wenlin Huang, Olga Serra, Keyvan Dastmalchi, Liqing Jin, Lijia Yang, Ruth E Stark
The potato (Solanum tuberosum L.) ranks third in worldwide consumption among food crops. Whereas disposal of potato peels poses significant challenges for the food industry, secondary metabolites in these tissues are also bioactive and essential to crop development. The diverse primary and secondary metabolites reported in whole tubers and wound-healing tissues prompted a comprehensive profiling study of native periderms from four cultivars with distinctive skin morphologies and commercial food uses. Polar and nonpolar soluble metabolites were extracted concurrently, analyzed chromatographically, and characterized with mass spectrometry; the corresponding solid interfacial polymeric residue was examined by solid-state (13)C NMR...
March 15, 2017: Journal of Agricultural and Food Chemistry
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