keyword
MENU ▼
Read by QxMD icon Read
search

Arctic

keyword
https://www.readbyqxmd.com/read/28542925/a-new-insight-into-the-ability-to-resist-ischemic-brain-injury-does-hibernation-matter-an-editorial-comment-for-arctic-ground-squirrel-hippocampus-tolerates-oxygen-glucose-deprivation-independent-of-hibernation-season-even-when-not-hibernating-and-after-atp
#1
EDITORIAL
Thomas I Nathaniel, Bianca Stewart, Jessica Williams, Michael Hood, Adebobola Imeh-Nathaniel
Read the commented article 'Arctic ground squirrel hippocampus tolerates oxygen glucose deprivation independent of hibernation season even when not hibernating and after ATP depletion, acidosis and glutamate efflux' on doi: 10.1111/jnc.13996.
May 24, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28542407/the-influence-of-persistent-organic-pollutants-in-the-traditional-inuit-diet-on-markers-of-inflammation
#2
L K Schæbel, E C Bonefeld-Jørgensen, H Vestergaard, S Andersen
Concentrations of persistent organic pollutants (POPs) are high in Inuit living predominately on the traditional marine diet. Adverse effects of POPs include disruption of the immune system and cardiovascular diseases that are frequent in Greenland Inuit. We aimed to assess the association between exposure to POPs from the marine diet and inflammation, taking into account other factors such as vitamin D. We invited Inuit and non-Inuit living in settlements or the town in rural East Greenland or in the capital city Nuuk...
2017: PloS One
https://www.readbyqxmd.com/read/28542369/trends-in-spatial-patterns-of-heavy-metal-deposition-on-national-park-service-lands-along-the-red-dog-mine-haul-road-alaska-2001-2006
#3
Peter N Neitlich, Jay M Ver Hoef, Shanti D Berryman, Anaka Mines, Linda H Geiser, Linda M Hasselbach, Alyssa E Shiel
Spatial patterns of Zn, Pb and Cd deposition in Cape Krusenstern National Monument (CAKR), Alaska, adjacent to the Red Dog Mine haul road, were characterized in 2001 and 2006 using Hylocomium moss tissue as a biomonitor. Elevated concentrations of Cd, Pb, and Zn in moss tissue decreased logarithmically away from the haul road and the marine port. The metals concentrations in the two years were compared using Bayesian posterior predictions on a new sampling grid to which both data sets were fit. Posterior predictions were simulated 200 times both on a coarse grid of 2,357 points and by distance-based strata including subsets of these points...
2017: PloS One
https://www.readbyqxmd.com/read/28537717/organophosphate-esters-in-air-snow-and-seawater-in-the-north-atlantic-and-the-arctic
#4
Jing Li, Zhiyong Xie, Wenying Mi, Senchao Lai, Chongguo Tian, Kay-Christian Emeis, Ralf Ebinghaus
The concentrations of eight organophosphate esters (OPEs) have been investigated in air, snow and seawater samples collected during the cruise of ARK-XXVIII/2 from 6th June to 3rd July 2014 across the North Atlantic and the Arctic. The sum of gaseous and particle concentrations (∑OPE) ranged from 35 to 343 pg/m3. The three chlorinated OPEs accounted for 88 ± 5% of the ∑OPE. The most abundant OPE was tris-(2-chloroethyl) phosphate (TCEP), with concentrations ranging from 30 to 227 pg/m3, followed by three major OPEs, such as tris-(1-chloro-2-propyl) phosphate (TCPP, 0...
May 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28531202/the-role-of-density-dependent-and-independent-processes-in-spawning-habitat-selection-by-salmon-in-an-arctic-riverscape
#5
Brock M Huntsman, Jeffrey A Falke, James W Savereide, Katrina E Bennett
Density-dependent (DD) and density-independent (DI) habitat selection is strongly linked to a species' evolutionary history. Determining the relative importance of each is necessary because declining populations are not always the result of altered DI mechanisms but can often be the result of DD via a reduced carrying capacity. We developed spatially and temporally explicit models throughout the Chena River, Alaska to predict important DI mechanisms that influence Chinook salmon spawning success. We used resource-selection functions to predict suitable spawning habitat based on geomorphic characteristics, a semi-distributed water-and-energy balance hydrologic model to generate stream flow metrics, and modeled stream temperature as a function of climatic variables...
2017: PloS One
https://www.readbyqxmd.com/read/28531177/geographical-trends-of-pfas-in-cod-livers-along-the-norwegian-coast
#6
Stig Valdersnes, Bente M Nilsen, Joar F Breivik, Asbjørn Borge, Amund Maage
The level of perfluorinated alkyl substances (PFAS) was determined in North East Arctic cod (Gadus morhua) liver samples from 15 Norwegian fjords and harbors. Five harbors in the eastern part of Norway, six harbors in the western part and four harbours in the northern part. A total of 200 samples were analyzed for 16 PFAS. Determination of PFAS were carried out by LC-MS/MS following sample clean up by solid phase extraction and ultracentrifugation. The predominating PFAS was PFOS, which was found to be higher than the level of quantification (1...
2017: PloS One
https://www.readbyqxmd.com/read/28529264/communities-of-putative-ericoid-mycorrhizal-fungi-isolated-from-alpine-dwarf-shrubs-in-japan-effects-of-host-identity-and-microhabitat
#7
Takahiko Koizumi, Kazuhide Nara
Dwarf shrubs of the family Ericaceae are common in arctic and alpine regions. Many of these plants are associated with ericoid mycorrhizal (ERM) fungi, which allow them to take nutrients and water from the soil under harsh environmental conditions and, thus, affect host plant survival. Despite the importance of ERM fungi to alpine plant communities, limited information is available on the effects of microhabitat and host identity on ERM fungal communities. We investigated the communities of putative ERM fungi isolated from five dwarf shrub species (Arcterica nana, Diapensia lapponica, Empetrum nigrum, Loiseleuria procumbens, and Vaccinium vitis-idaea) that co-occur in an alpine region of Japan, with reference to distinct microhabitats provided by large stone pine (Pinus pumila) shrubs (i...
May 20, 2017: Microbes and Environments
https://www.readbyqxmd.com/read/28528907/widespread-biological-response-to-rapid-warming-on-the-antarctic-peninsula
#8
Matthew J Amesbury, Thomas P Roland, Jessica Royles, Dominic A Hodgson, Peter Convey, Howard Griffiths, Dan J Charman
Recent climate change on the Antarctic Peninsula is well documented [1-5], with warming, alongside increases in precipitation, wind strength, and melt season length [1, 6, 7], driving environmental change [8, 9]. However, meteorological records mostly began in the 1950s, and paleoenvironmental datasets that provide a longer-term context to recent climate change are limited in number and often from single sites [7] and/or discontinuous in time [10, 11]. Here we use moss bank cores from a 600-km transect from Green Island (65...
May 17, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28526845/chemical-structure-of-the-lipid-a-component-of-pseudomonas-sp-strain-pamc-28618-from-thawing-permafrost-in-relation-to-pathogenicity
#9
Han-Gyu Park, Ganesan Sathiyanarayanan, Cheol-Hwan Hwang, Da-Hee Ann, Jung-Ho Kim, Geul Bang, Kyoung-Soon Jang, Hee Wook Ryu, Yoo Kyung Lee, Yung-Hun Yang, Yun-Gon Kim
Climate change causes permafrost thawing, and we are confronted with the unpredictable risk of newly discovered permafrost microbes that have disease-causing capabilities. Here, we first characterized the detailed chemical structure of the lipid A moiety from a Pseudomonas species that was isolated from thawing arctic permafrost using MALDI-based mass spectrometric approaches (i.e., MALDI-TOF MS and MALDI-QIT-TOF MS(n)). The MALDI multi-stage mass spectrometry (MS) analysis of lipid A extracted from the Pseudomonas sp...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28515896/a-worldwide-phylogeography-of-the-whiteworm-lichens-thamnolia-reveals-three-lineages-with-distinct-habitats-and-evolutionary-histories
#10
Ioana Onuţ-Brännström, Leif Tibell, Hanna Johannesson
Thamnolia is a lichenized fungus with an extremely wide distribution, being encountered in arctic and alpine environments in most continents. In this study, we used molecular markers to investigate the population structure of the fungal symbiont and the associated photosynthetic partner of Thamnolia. By analyzing molecular, morphological, and chemical variation among 253 specimens covering the species distribution range, we revealed the existence of three mycobiont lineages. One lineage (Lineage A) is confined to the tundra region of Siberia and the Aleutian Islands, a second (Lineage B) is found in the high alpine region of the Alps and the Carpathians Mountains, and a third (Lineage C) has a worldwide distribution and covers both the aforementioned ecosystems...
May 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28513599/corrigendum-arctic-megaslide-at-presumed-rest
#11
Wolfram H Geissler, A Catalina Gebhardt, Felix Gross, Jutta Wollenburg, Laura Jensen, Mechita C Schmidt-Aursch, Sebastian Krastel, Judith Elger, Giacomo Osti
No abstract text is available yet for this article.
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28513149/vertical-profiles-sources-and-transport-of-pfass-in-the-arctic-ocean
#12
Leo Wai-Yin Yeung, Clifton Dassuncao, Scott Andrew Mabury, Elsie M Sunderland, Xianming Zhang, Rainer Lohmann
The relative importance of atmospheric versus oceanic transport for poly- and perfluorinated alkyl substances (PFASs) reaching the Arctic Ocean is not well understood. Vertical profiles from the Central Arctic Ocean and shelf water, snow and meltwater samples were collected in 2012; 13 PFASs (C6-C12 PFCAs; C6, 8, 10 PFSAs; MeFOSAA and EtFOSAA, and FOSA) were routinely detected (range: <5 - 343 pg/L). PFASs were only detectable above 150 m depth in the polar mixed layer (PML) and halocline. Enhanced concentrations were observed in snow and meltpond samples, implying atmospheric deposition as an important source of PFASs...
May 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28512225/high-arctic-holocene-temperature-record-from-the-agassiz-ice-cap-and-greenland-ice-sheet-evolution
#13
Benoit S Lecavalier, David A Fisher, Glenn A Milne, Bo M Vinther, Lev Tarasov, Philippe Huybrechts, Denis Lacelle, Brittany Main, James Zheng, Jocelyne Bourgeois, Arthur S Dyke
We present a revised and extended high Arctic air temperature reconstruction from a single proxy that spans the past ∼12,000 y (up to 2009 CE). Our reconstruction from the Agassiz ice cap (Ellesmere Island, Canada) indicates an earlier and warmer Holocene thermal maximum with early Holocene temperatures that are 4-5 °C warmer compared with a previous reconstruction, and regularly exceed contemporary values for a period of ∼3,000 y. Our results show that air temperatures in this region are now at their warmest in the past 6,800-7,800 y, and that the recent rate of temperature change is unprecedented over the entire Holocene...
May 16, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28509898/modern-pollen-data-from-the-canadian-arctic-1972-1973
#14
Harvey Nichols, Susann Stolze
This data descriptor reports results of a 1972-73 baseline study of modern pollen deposition in the Canadian Arctic to originally aid interpretation of Holocene pollen diagrams from that region, especially focussed on the arctic tree-line. The data set is geographically unique due to its extent, and allows the assessment of the effects of modern climate change on northern ecosystems, including fluctuations of the a arctic tree-line. Repeated sampling was conducted along an interior transect at 29 sites from the Boreal Forest to the High Arctic, with five additional coastal sites covering a total distance of 3,200 km...
May 16, 2017: Scientific Data
https://www.readbyqxmd.com/read/28508037/arctic-greening-from-warming-promotes-declines-in-caribou-populations
#15
Per Fauchald, Taejin Park, Hans Tømmervik, Ranga Myneni, Vera Helene Hausner
The migratory tundra caribou herds in North America follow decadal population cycles, and browsing from abundant caribou could be expected to counteract the current climate-driven expansion of shrubs in the circumpolar tundra biome. We demonstrate that the sea ice cover in the Arctic Ocean has provided a strong signal for climate-induced changes on the adjacent caribou summer ranges, outperforming other climate indices in explaining the caribou-plant dynamics. We found no evidence of a negative effect of caribou abundance on vegetation biomass...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28503709/morphological-and-molecular-characterization-of-sarcocystis-arctica-like-sarcocysts-from-the-arctic-fox-vulpes-lagopus-from-alaska-usa
#16
Camila K Cerqueira-Cézar, Peter C Thompson, Shiv Kumar Verma, Joseph Mowery, Rafael Calero-Bernal, Fernando H Antunes Murata, David R Sinnett, Caroline Van Hemert, Benjamin M Rosenthal, Jitender P Dubey
The muscles of herbivores commonly harbor sarcocysts of parasites belonging to species in the genus Sarcocystis, but such muscle parasites are rare in carnivores. Here, we report Sarcocystis arctica-like sarcocysts in muscles of Arctic foxes (Vulpes lagopus) from Alaska, USA, for the first time. The tongues of 56 foxes were examined for Sarcocystis infection using several methods. Sarcocystis bradyzoites were detected in pepsin digests of 13 (23.2%), and sarcocysts were found in histological sections stained with hematoxylin and eosin (HE) of 9 (16...
May 15, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28500441/route-simulations-compass-mechanisms-and-long-distance-migration-flights-in-birds
#17
REVIEW
Susanne Åkesson, Giuseppe Bianco
Bird migration has fascinated humans for centuries and routes crossing the globe are now starting to be revealed by advanced tracking technology. A central question is what compass mechanism, celestial or geomagnetic, is activated during these long flights. Different approaches based on the geometry of flight routes across the globe and route simulations based on predictions from compass mechanisms with or without including the effect of winds have been used to try to answer this question with varying results...
May 12, 2017: Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
https://www.readbyqxmd.com/read/28494402/polycyclic-aromatic-hydrocarbons-in-ocean-sediments-from-the-north-pacific-to-the-arctic-ocean
#18
Yuxin Ma, Crispin J Halsall, Zhiyong Xie, Danijela Koetke, Wenying Mi, Ralf Ebinghaus, Guoping Gao
Eighteen polycyclic aromatic hydrocarbons (PAHs) were measured in surficial sediments along a marine transect from the North Pacific into the Arctic Ocean. The highest average Σ18PAHs concentrations were observed along the continental slope of the Canada Basin in the Arctic (68.3 ± 8.5 ng g(-1) dw), followed by sediments in the Chukchi Sea shelf (49.7 ± 21.2 ng g(-1) dw) and Bering Sea (39.5 ± 11.3 ng g(-1) dw), while the Bering Strait (16.8 ± 7.1 ng g(-1) dw) and Central Arctic Ocean sediments (13...
May 8, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28488767/an-assessment-of-postcranial-indices-ratios-and-body-mass-versus-eco-geographical-variables-of-prehistoric-jomon-yayoi-agriculturalists-and-kumejima-islanders-of-japan
#19
Noriko Seguchi, Conrad B Quintyn, Shiori Yonemoto, Hirofumi Takamuku
OBJECTIVES: We explore variations in body and limb proportions of the Jomon hunter-gatherers (14,000-2500 BP), the Yayoi agriculturalists (2500-1700 BP) of Japan, and the Kumejima Islanders of the Ryukyus (1600-1800 AD) with 11 geographically diverse skeletal postcranial samples from Africa, Europe, Asia, Australia, and North America using brachial-crural indices, femur head-breadth-to-femur length ratio, femur head-breadth-to-lower-limb-length ratio, and body mass as indicators of phenotypic climatic adaptation...
May 10, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/28488280/open-tundra-persist-but-arctic-features-decline-vegetation-changes-in-the-warming-fennoscandian-tundra
#20
Katariina E M Vuorinen, Lauri Oksanen, Tarja Oksanen, Anni Pyykönen, Johan Olofsson, Risto Virtanen
In the forest-tundra ecotone of the North Fennoscandian inland, summer and winter temperatures have increased by two to three centigrades since 1965, which is expected to result in major vegetation changes. To document the expected expansion of woodlands and scrublands and its impact on the arctic vegetation, we repeated a vegetation transect study conducted in 1976 in the Darju, spanning from woodland to a summit, 200 m above the tree line. Contrary to our expectations, tree line movement was not detected, and there was no increase in willows or shrubby mountain birches, either...
May 10, 2017: Global Change Biology
keyword
keyword
55066
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"