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Sample records for denning polar bears

  1. Polar bear den survey, Arctic National Wildlife Range

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — In conjunction with the Polar Bear Research Project being supervised by Mr. Jack Lentfer of the Bureau of Sport Fisheries and Wildlife two Polar Bear den surveys...

  2. Polar bear maternity denning in the Beaufort Sea

    Science.gov (United States)

    Amstrup, Steven C.; Gardner, Craig L.

    1994-01-01

    The distribution of polar bears (Ursus maritimus) is circumpolar in the NOrthern Hemisphere, but known locations of maternal dens are concentrated in relatively few, widely scattered locations. Denning is either uncommon or unknown within gaps. To understand effects of industrial development and propose increases in hunting, the temporal and spatial distribution of denning in the Beaufort Sea must be known. We caputred and radiocollared polar bears between 1981 and 1991 and determined tht denning in the Beaufort Sea region was sufficient to account for the estimated population there. Of 90 dend, 48 were on drifting pack ice, 38 on land, and 4 on land-fast ice. The portions of dens on land was higher (P= 0.029) in later compared with earlier years of the study. Bears denning on pack ice drifting as far as 997 km (x=385km) while in dens. there was no difference in cun production by bears denning on land and pack ice (P =0.66). Mean entry and exit dates were 11 November and 5 April for land dens and 22 November and 26 March for pack-ice dens. Female polar bears captured in the Beaufort Sea appeared to be isolated from those caught eat of Cape Bathurst in Canada. Of 35 polar bears that denned along the mainland coast of Alaska and Canada 80% denned between 137 00'W snf 146 59'W. Bears followed to >1 den did not reuse sites and consecutive dens were 20-1,304 km apart. However radio-collared bears are largely faithful to substrate (pack-ice, land, and land-fast ice) and the general geographic area of previous dens. Bears denning on land may be vunerable to human activities such as hunting and industrial development. However, predictable denning chronology and alck of site fidelity indicate that many potential impacts on denning polar bears could be mitigated.

  3. Polar bear mother-offspring interactions in maternity dens in captivity.

    Science.gov (United States)

    van Gessel, Chad

    2015-01-01

    Two female polar bears at Dierenrijk Zoo in the Netherlands were monitored at their maternity den one day before the birth of their cubs and three days postpartum. Each bear was monitored for 96 hr to document behaviour and vocalisations. The goal was to obtain insight into the differences between the mother that lost her litter and the other that successfully reared her cubs. Six groups of cub vocalisations were identified: Comfort, Discomfort, Distress, Nursing Attempts, Nursing, and No Vocalisation. Maternal vocalisations were split into three groups: Calm, Grooming, and Stress. Maternal behaviours were also split into three groups: Active, Rest, and Stress. The unsuccessful mother produced more stress vocalisations before and during the birth of her cub, whereas the successful mother appeared less stressed. Vocalisations indicate that the cub that died tried to nurse but was unsuccessful. The unsuccessful mother showed less stress as her cub got weaker and vocalised less. From this I suggest that maternal stress was a factor in cub mortality.

  4. Remote identification of potential polar bear maternal denning habitat in northern Alaska using airborne LiDAR

    Science.gov (United States)

    Jones, B. M.; Durner, G. M.; Stoker, J.; Shideler, R.; Perham, C.; Liston, G. E.

    2013-12-01

    Polar bear (Ursus maritimus) populations throughout the Arctic are being threatened by reductions in critical sea ice habitat. Throughout much of their range, polar bears give birth to their young in winter dens that are excavated in snowdrifts. New-born cubs, which are unable to survive exposure to Arctic winter weather, require 2-3 months of the relatively warm, stable, and undisturbed environment of the den for their growth. In the southern Beaufort Sea (BS), polar bears may den on the Alaskan Arctic Coastal Plain (ACP).The proportion of dens occurring on land has increased because of reductions in stable multi-year ice, increases in unconsolidated ice, and lengthening of the fall open-water period. Large portions of the ACP are currently being used for oil and gas activities and proposed projects will likely expand this footprint in the near future. Since petroleum exploration and development activities increase during winter there is the potential for human activities to disturb polar bears in maternal dens. Thus, maps showing the potential distribution of terrestrial denning habitat can help to mitigate negative interactions. Prior remote sensing efforts have consisted of manual interpretation of vertical aerial photography and automated classification of Interferometric Synthetic Aperture (IfSAR) derived digital terrain models (DTM) (5-m spatial resolution) focused on the identification of snowdrift forming landscape features. In this study, we assess the feasibility of airborne Light Detection and Ranging (LiDAR) data (2-m spatial resolution) for the automated classification of potential polar bear maternal denning habitat in a 1,400 km2 area on the central portion of the ACP. The study region spans the BS coast from the Prudhoe Bay oilfield in the west to near Point Thompson in the east and extends inland from 10 to 30 km. Approximately 800 km2 of the study area contains 19 known den locations, 51 field survey sites with information on bank height and

  5. Denning Ecology of Black Bears in the Great Dismal Swamp

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Available information on black bear denning ecology in southeastern wetland populations for management and conservation purposes is limited. This researcher...

  6. Polar bears: the fate of an icon.

    Science.gov (United States)

    Fitzgerald, Kevin T

    2013-11-01

    Polar bears are one of the most iconic animals on our planet. Worldwide, even people who would never see one are drawn to these charismatic arctic ice hunters. They are the world's largest terrestrial carnivore, and despite being born on land, they spend most of their lives out on the sea ice and are considered a marine mammal. Current global studies estimate there are around 20,000 animals in some 19 discrete circumpolar populations. Aside from pregnant females denning in the winter months to give birth, the white bears do not hibernate. They spend their winters on the sea ice hunting seals, an activity they are spectacularly adapted for. Research on these animals is incredibly difficult because of the inhospitable surroundings they inhabit and how inaccessible they make the bears. For many years, the sum of our understanding of the natural history of polar bears came from tracks, scats, the remains of their kills, abandoned dens, and anecdotal observations of native hunters, explorers, and early biologists. Nonetheless, the last 40 years have seen a much better picture of their biology emerge thanks to, first, dedicated Canadian researchers and, later, truly international efforts of workers from many countries. Veterinarians have contributed to our knowledge of the bears by delivering and monitoring anesthesia, obtaining blood samples, performing necropsies, investigating their reproduction, conducting radiotelemetry studies, and examining their behavior. Recently, new technologies have been developed that revolutionize the study of the lives and natural history of undisturbed polar bears. These advances include better satellite radiotelemetry equipment and the development of remote-controlled miniature devices equipped with high-definition cameras. Such new modalities provide dramatic new insights into the life of polar bears. The remarkable degree of specialized adaptation to life on the sea ice that allowed the bears to be successful is the very reason that

  7. American black bear denning behavior: Observations and applications using remote photography

    Science.gov (United States)

    Bridges, A.S.; Fox, J.A.; Olfenbuttel, C.; Vaughan, M.B.

    2004-01-01

    Researchers examining American black bear (Ursus americanus) denning behavior have relied primarily on den-site visitation and radiotelemetry to gather data. Repeated den-site visits are time-intensive and may disturb denning bears, possibly causing den abandonment, whereas radiotelemetry is sufficient only to provide gross data on den emergence. We used remote cameras to examine black bear denning behavior in the Allegheny Mountains of western Virginia during March-May 2003. We deployed cameras at 10 den sites and used 137 pictures of black bears. Adult female black bears exhibited greater extra-den activity than we expected prior to final den emergence, which occurred between April 12 and May 6, 2003. Our technique provided more accurate den-emergence estimation than previously published methodologies. Additionally, we observed seldom-documented behaviors associated with den exits and estimated cub age at den emergence. Remote cameras can provide unique insights into denning ecology, and we describe their potential application to reproductive, survival, and behavioral research.

  8. Selection of den sites by black bears in the southern Appalachians

    Science.gov (United States)

    Reynolds-Hogland, M. J.; Mitchell, M.S.; Powell, R.A.; Brown, D.C.

    2007-01-01

    We evaluated selection of den sites by American black bears (Ursus americanus) in the Pisgah Bear Sanctuary, western North Carolina, by comparing characteristics of dens at 53 den sites with availability of habitat characteristics in annual home ranges of bears and in the study area. We also tested whether den-site selection differed by sex, age, and reproductive status of bears. In addition, we evaluated whether the den component of an existing habitat model for black bears predicted where bears would select den sites. We found bears selected den sites far from gravel roads, on steep slopes, and at high elevations relative to what was available in both annual home ranges and in the study area. Den-site selection did not differ by sex or age, but it differed by reproductive status. Adult females with cubs preferred to den in areas that were relatively far from gravel roads, but adult females without cubs did not. The habitat model overestimated the value of areas near gravel roads, underestimated the value of moderately steep areas, and did not include elevation as a predictor variable. Our results highlight the importance of evaluating den selection in terms of both use and availability of den characteristics. ?? 2007 American Society of Mammalogists.

  9. Report to the annual joint meeting for management of polar bears in the southern Beaufort Sea

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Objectives of research conducted between 1 981 and the present were: 1. Determine the distribution timing and significance of maternal denning by polar bears in...

  10. Fractal analysis of polar bear hairs

    Directory of Open Access Journals (Sweden)

    Wang Qing-Li

    2015-01-01

    Full Text Available Hairs of a polar bear (Ursus maritimus are of superior properties such as the excellent thermal protection. Why do polar bears can resist such cold environment? The paper concludes that its fractal porosity plays an important role, and its fractal dimensions are very close to the golden mean, 1.618, revealing the possible optimal structure of polar bear hair.

  11. Recent observations of intraspecific predation and cannibalism among polar bears in the southern Beaufort Sea

    Science.gov (United States)

    Amstrup, Steven C.; Stirling, I.; Smith, T.S.; Perham, C.; Thiemann, G.W.

    2006-01-01

    Intraspecific killing has been reported among polar bears (Ursus maritimus), brown bears (U. arctos), and black bears (U. americanus). Although cannibalism is one motivation for such killings, the ecological factors mediating such events are poorly understood. Between 24 January and 10 April 2004, we confirmed three instances of intraspecific predation and cannibalism in the Beaufort Sea. One of these, the first of this type ever reported for polar bears, was a parturient female killed at her maternal den. The predating bear was hunting in a known maternal denning area and apparently discovered the den by scent. A second predation event involved an adult female and cub recently emerged from their den, and the third involved a yearling male. During 24 years of research on polar bears in the southern Beaufort Sea region of northern Alaska and 34 years in northwestern Canada, we have not seen other incidents of polar bears stalking, killing, and eating other polar bears. We hypothesize that nutritional stresses related to the longer ice-free seasons that have occurred in the Beaufort Sea in recent years may have led to the cannibalism incidents we observed in 2004. ?? Springer-Verlag 2006.

  12. Operating procedures, Pilot polar bear survey

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Distance will be measured from the "center" of the sighting (polar bear, group of bears, group of walrus, etc.) to the flight line along a perpendicular projection...

  13. Goose Eggs Could Save Polar Bears

    Institute of Scientific and Technical Information of China (English)

    孙淑敏

    2009-01-01

    Polar bears could avoid extinction despitemany starving to death in coming years, ac-cording to scientists and other observers whohave discovered that some of the bears havefound a new food source--goose and duckeggs.

  14. Can polar bear hairs absorb environmental energy?

    Directory of Open Access Journals (Sweden)

    He Ji-Huan

    2011-01-01

    Full Text Available A polar bear (Ursus maritimus has superior ability to survive in harsh Arctic regions, why does the animal have such an excellent thermal protection? The present paper finds that the unique labyrinth cavity structure of the polar bear hair plays an important role. The hair can not only prevent body temperature loss but can also absorb energy from the environment.

  15. Can polar bear hairs absorb environmental energy?

    OpenAIRE

    He Ji-Huan; Wang Qing-Li; Sun Jie

    2011-01-01

    A polar bear (Ursus maritimus) has superior ability to survive in harsh Arctic regions, why does the animal have such an excellent thermal protection? The present paper finds that the unique labyrinth cavity structure of the polar bear hair plays an important role. The hair can not only prevent body temperature loss but can also absorb energy from the environment.

  16. Increased Land Use by Chukchi Sea Polar Bears in Relation to Changing Sea Ice Conditions.

    Directory of Open Access Journals (Sweden)

    Karyn D Rode

    Full Text Available Recent observations suggest that polar bears (Ursus maritimus are increasingly using land habitats in some parts of their range, where they have minimal access to their preferred prey, likely in response to loss of their sea ice habitat associated with climatic warming. We used location data from female polar bears fit with satellite radio collars to compare land use patterns in the Chukchi Sea between two periods (1986-1995 and 2008-2013 when substantial summer sea-ice loss occurred. In both time periods, polar bears predominantly occupied sea-ice, although land was used during the summer sea-ice retreat and during the winter for maternal denning. However, the proportion of bears on land for > 7 days between August and October increased between the two periods from 20.0% to 38.9%, and the average duration on land increased by 30 days. The majority of bears that used land in the summer and for denning came to Wrangel and Herald Islands (Russia, highlighting the importance of these northernmost land habitats to Chukchi Sea polar bears. Where bears summered and denned, and how long they spent there, was related to the timing and duration of sea ice retreat. Our results are consistent with other studies supporting increased land use as a common response of polar bears to sea-ice loss. Implications of increased land use for Chukchi Sea polar bears are unclear, because a recent study observed no change in body condition or reproductive indices between the two periods considered here. This result suggests that the ecology of this region may provide a degree of resilience to sea ice loss. However, projections of continued sea ice loss suggest that polar bears in the Chukchi Sea and other parts of the Arctic may increasingly use land habitats in the future, which has the potential to increase nutritional stress and human-polar bear interactions.

  17. Polar bears and sea ice habitat change

    Science.gov (United States)

    Durner, George M.; Atwood, Todd C.; Butterworth, Andy

    2017-01-01

    The polar bear (Ursus maritimus) is an obligate apex predator of Arctic sea ice and as such can be affected by climate warming-induced changes in the extent and composition of pack ice and its impacts on their seal prey. Sea ice declines have negatively impacted some polar bear subpopulations through reduced energy input because of loss of hunting habitats, higher energy costs due to greater ice drift, ice fracturing and open water, and ultimately greater challenges to recruit young. Projections made from the output of global climate models suggest that polar bears in peripheral Arctic and sub-Arctic seas will be reduced in numbers or become extirpated by the end of the twenty-first century if the rate of climate warming continues on its present trajectory. The same projections also suggest that polar bears may persist in the high-latitude Arctic where heavy multiyear sea ice that has been typical in that region is being replaced by thinner annual ice. Underlying physical and biological oceanography provides clues as to why polar bear in some regions are negatively impacted, while bears in other regions have shown no apparent changes. However, continued declines in sea ice will eventually challenge the survival of polar bears and efforts to conserve them in all regions of the Arctic.

  18. The polar bear and its protection

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — No census has been made of the polar bear population and indeed the general movements of the animals within their range are poorly known. At present it is not...

  19. Mercury biomagnification in polar bears ( Ursus maritimus)

    Science.gov (United States)

    Horton, T. W.; Blum, J. D.; Xie, Z.; Hren, M.; Chamberlain, C. P.

    2007-12-01

    Mercury biomagnification occurs in a variety of ecosystems resulting in greater potential for toxicological effects in higher-level trophic feeders. However, Hg transport pathways through different foodweb channels are not well known, particularly in high-latitude systems affected by atmospheric Hg deposition associated with snow and ice. Stable carbon and nitrogen isotope ratios and Hg concentrations determined for 26 late 19th and early 20th century polar bear hair specimens collected from cataloged museum collections elucidate relationships between high latitude marine foodweb structure and Hg transport pathways. Nitrogen and carbon isotopic compositions suggest that polar bears derive nutrition from both open water (pelagic) and ice associated (sympagic) foodweb channels. Correlation between Hg concentrations and nitrogen isotope compositions indicate mercury biomagnification occurred in most of the polar bears investigated. Interpretation of stable isotope based foodweb structure in concert with Hg concentrations further suggests that Hg biomagnification occurred to a greater degree in polar bears participating in pelagic foodweb channels.

  20. Polar bear research in Alaska, spring 1982

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — An investigation of the ecology and population dynamics of Alaskan polar bears has continued since 1967. As part of that program, U.S. Fish and Wildlife Service...

  1. Polar bear research in Alaska, spring 1981

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — An investigation of the ecology and population dynamics of Alaskan polar bears has continued since 1967. As part of that program, U.S. Fish and Wildlife Service...

  2. Breeding facilities for polar bears, Thalarctos maritimus (Phipps, 1774), in captivity

    NARCIS (Netherlands)

    Jacobi, E.F.

    1968-01-01

    The breeding results of Polar Bears in captivity are in general very disappointing. Unsuitable maternity dens are the main cause. These should be completely closed, very quiet without outside disturbances and should have connection with a run and thus with an outside enclosure. The female should be

  3. Despotism and risk of infanticide influence grizzly bear den-site selection.

    Directory of Open Access Journals (Sweden)

    Nathan S Libal

    Full Text Available Given documented social dominance and intraspecific predation in bear populations, the ideal despotic distribution model and sex hypothesis of sexual segregation predict adult female grizzly bears (Ursus arctos will avoid areas occupied by adult males to reduce risk of infanticide. Under ideal despotic distribution, juveniles should similarly avoid adult males to reduce predation risk. Den-site selection and use is an important component of grizzly bear ecology and may be influenced by multiple factors, including risk from conspecifics. To test the role of predation risk and the sex hypothesis of sexual segregation, we compared adult female (n = 142, adult male (n = 36, and juvenile (n = 35 den locations in Denali National Park and Preserve, Alaska, USA. We measured elevation, aspect, slope, and dominant land cover for each den site, and used maximum entropy modeling to determine which variables best predicted den sites. We identified the global model as the best-fitting model for adult female (area under curve (AUC = 0.926 and elevation as the best predictive variable for adult male (AUC = 0.880 den sites. The model containing land cover and elevation best-predicted juvenile (AUC = 0.841 den sites. Adult females spatially segregated from adult males, with dens characterized by higher elevations (mean= 1,412 m, SE = 52 and steeper slopes (mean = 21.9°, SE = 1.1 than adult male (elevation: mean = 1,209 m, SE = 76; slope: mean = 15.6°, SE = 1.9 den sites. Juveniles used a broad range of landscape attributes but did not avoid adult male denning areas. Observed spatial segregation by adult females supports the sex hypothesis of sexual segregation and we suggest is a mechanism to reduce risk of infanticide. Den site selection of adult males is likely related to distribution of food resources during spring.

  4. Despotism and risk of infanticide influence grizzly bear den-site selection.

    Science.gov (United States)

    Libal, Nathan S; Belant, Jerrold L; Leopold, Bruce D; Wang, Guiming; Owen, Patricia A

    2011-01-01

    Given documented social dominance and intraspecific predation in bear populations, the ideal despotic distribution model and sex hypothesis of sexual segregation predict adult female grizzly bears (Ursus arctos) will avoid areas occupied by adult males to reduce risk of infanticide. Under ideal despotic distribution, juveniles should similarly avoid adult males to reduce predation risk. Den-site selection and use is an important component of grizzly bear ecology and may be influenced by multiple factors, including risk from conspecifics. To test the role of predation risk and the sex hypothesis of sexual segregation, we compared adult female (n = 142), adult male (n = 36), and juvenile (n = 35) den locations in Denali National Park and Preserve, Alaska, USA. We measured elevation, aspect, slope, and dominant land cover for each den site, and used maximum entropy modeling to determine which variables best predicted den sites. We identified the global model as the best-fitting model for adult female (area under curve (AUC) = 0.926) and elevation as the best predictive variable for adult male (AUC = 0.880) den sites. The model containing land cover and elevation best-predicted juvenile (AUC = 0.841) den sites. Adult females spatially segregated from adult males, with dens characterized by higher elevations (mean= 1,412 m, SE = 52) and steeper slopes (mean = 21.9°, SE = 1.1) than adult male (elevation: mean = 1,209 m, SE = 76; slope: mean = 15.6°, SE = 1.9) den sites. Juveniles used a broad range of landscape attributes but did not avoid adult male denning areas. Observed spatial segregation by adult females supports the sex hypothesis of sexual segregation and we suggest is a mechanism to reduce risk of infanticide. Den site selection of adult males is likely related to distribution of food resources during spring.

  5. The influence of climate variability on polar bear (Ursus maritimus) and ringed seal (Pusa hispida) population dynamics

    DEFF Research Database (Denmark)

    Rosing-Asvid, A.

    2006-01-01

    Unusually high polar bear (Ursus maritimus Phipps, 1774) predation on ringed seal (Pusa hispida (Schreber, 1775)) pups and increased survival of polar bear cubs during mild springs is documented in published articles. Strong predation on newborn ringed seal pups in early spring, however, is likely...... to lower the overall energy intake of polar bears if ringed seal pups are their main food, because the energetic value of ringed seal pups increases 7-8 times during the 6 week lactation period. So although hunting success in early spring increases cub survival during the period after den emergence......,when they are most vulnerable, it is likely to increase the number of starving bears later in the season. This negative-feedback effect of strong spring predation will not occur in areas where other seal species are abundant during summer, and polar bears in such areas are likely to exhibit population growth during...

  6. Barents Sea polar bears (Ursus maritimus: population biology and anthropogenic threats

    Directory of Open Access Journals (Sweden)

    Magnus Andersen

    2016-07-01

    Full Text Available This paper examines how anthropogenic threats, such as disturbance, pollution and climate change, are linked to polar bear (Ursus maritimus population biology in the Svalbard and Barents Sea area, with the aim to increase our understanding of how human activity may impact the population. Overharvesting drastically reduced the population of polar bears in the Barents Sea region from about 1870 to 1970. After harvesting was stopped—in 1956 in Russia and 1973 in Norway—the population grew to an estimated 2650 individuals (95% confidence interval 1900–3600 in 2004, and maternity denning in the Svalbard Archipelago became more widely distributed. During recent decades, the population has faced challenges from a variety of new anthropogenic impacts: a range of pollutants, an increasing level of human presence and activity as well as changes in ice conditions. Contaminants bioaccumulate up through the marine food web, culminating in this top predator that consumes ringed, bearded and harp seals. Females with small cubs use land-fast sea ice for hunting and are therefore vulnerable to disturbance by snowmobile drivers. Sea-ice diminution, associated with climate change, reduces polar bears’ access to denning areas and could negatively affect the survival of cubs. There are clear linkages between population biology and current anthropogenic threats, and we suggest that future research and management should focus on and take into consideration the combined effects of several stressors on polar bears.

  7. Gene transcription in polar bears (Ursus maritimus) from disparate populations

    Science.gov (United States)

    Bowen, Lizabeth; Miles, A. Keith; Waters, Shannon C.; Meyerson, Randi; Rode, Karyn D.; Atwood, Todd C.

    2015-01-01

    Polar bears in the Beaufort (SB) and Chukchi (CS) Seas experience different environments due primarily to a longer history of sea ice loss in the Beaufort Sea. Ecological differences have been identified as a possible reason for the generally poorer body condition and reproduction of Beaufort polar bears compared to those from the Chukchi, but the influence of exposure to other stressors remains unknown. We use molecular technology, quantitative PCR, to identify gene transcription differences among polar bears from the Beaufort and Chukchi Seas as well as captive healthy polar bears. We identified significant transcriptional differences among a priori groups (i.e., captive bears, SB 2012, SB 2013, CS 2013) for ten of the 14 genes of interest (i.e., CaM, HSP70, CCR3, TGFβ, COX2, THRα, T-bet, Gata3, CD69, and IL17); transcription levels of DRβ, IL1β, AHR, and Mx1 did not differ among groups. Multivariate analysis also demonstrated separation among the groups of polar bears. Specifically, we detected transcript profiles consistent with immune function impairment in polar bears from the Beaufort Sea, when compared with Chukchi and captive polar bears. Although there is no strong indication of differential exposure to contaminants or pathogens between CS and SB bears, there are clearly differences in important transcriptional responses between populations. Further investigation is warranted to refine interpretation of potential effects of described stress-related conditions for the SB population.

  8. Steroid hormone profile in female polar bears (Ursus maritimus)

    DEFF Research Database (Denmark)

    Gustavson, Lisa; Jenssen, Bjorn Munro; Bytingsvik, Jenny

    2015-01-01

    The polar bear is an iconic Arctic species, threatened by anthropogenic impacts such as pollution and climate change. Successful reproduction of polar bears depends on a functioning steroid hormone system, which is susceptible to effects of persistent organic pollutants. The present study...... is the first study to report circulating concentrations of nine steroid hormones (i.e., estrogens, androgens and progestagens) in female polar bears (Ursus maritimus). The aim of the study was to investigate the effects of age, condition, location and reproductive status on steroid profile in female polar...... bears. Levels of pregnenolone (PRE), progesterone, androstenedione (AN), dehydroepiandrosterone (DHEA), testosterone, dihydrotestosterone, estrone (E1), 17α-estradiol (αE2) and 17β-estradiol (βE2) were quantified in blood (serum) of free-living female polar bears (n = 15) from Svalbard, Norway, by gas...

  9. Estimating Potential Effects of Hypothetical Oil Spills on Polar Bears

    Science.gov (United States)

    Amstrup, Steven C.; Durner, G.M.; McDonald, T.L.; Johnson, W.R.

    2006-01-01

    Much is known about the transport and fate of oil spilled into the sea and its toxicity to exposed wildlife. Previously, however, there has been no way to quantify the probability that wildlife dispersed over the seascape would be exposed to spilled oil. Polar bears, the apical predator of the arctic, are widely dispersed near the continental shelves of the Arctic Ocean, an area also undergoing considerable hydrocarbon exploration and development. We used 15,308 satellite locations from 194 radiocollared polar bears to estimate the probability that polar bears could be exposed to hypothetical oil spills. We used a true 2 dimensional Gausian kernel density estimator, to estimate the number of bears likely to occur in each 1.00 km2 cell of a grid superimposed over near shore areas surrounding 2 oil production facilities: the existing Northstar oil production facility, and the proposed offshore site for the Liberty production facility. We estimated the standard errors of bear numbers per cell with bootstrapping. Simulated oil spill footprints for September and October, the times during which we hypothesized effects of an oil-spill would be worst, were estimated using real wind and current data collected between 1980 and 1996. We used ARC/Info software to calculate overlap (numbers of bears oiled) between simulated oil-spill footprints and polar bear grid-cell values. Numbers of bears potentially oiled by a hypothetical 5912 barrel spill (the largest spill thought probable from a pipeline breach) ranged from 0 to 27 polar bears for September open water conditions, and from 0 to 74 polar bears in October mixed ice conditions. Median numbers oiled by the 5912 barrel hypothetical spill from the Liberty simulation in September and October were 1 and 3 bears, equivalent values for the Northstar simulation were 3 and 11 bears. In October, 75% of trajectories from the 5912 barrel simulated spill at Liberty oiled 9 or fewer bears while 75% of the trajectories affected 20 or

  10. Effects of climate warming on polar bears: a review of the evidence.

    Science.gov (United States)

    Stirling, Ian; Derocher, Andrew E

    2012-09-01

    Climate warming is causing unidirectional changes to annual patterns of sea ice distribution, structure, and freeze-up. We summarize evidence that documents how loss of sea ice, the primary habitat of polar bears (Ursus maritimus), negatively affects their long-term survival. To maintain viable subpopulations, polar bears depend on sea ice as a platform from which to hunt seals for long enough each year to accumulate sufficient energy (fat) to survive periods when seals are unavailable. Less time to access to prey, because of progressively earlier breakup in spring, when newly weaned ringed seal (Pusa hispida) young are available, results in longer periods of fasting, lower body condition, decreased access to denning areas, fewer and smaller cubs, lower survival of cubs as well as bears of other age classes and, finally, subpopulation decline toward eventual extirpation. The chronology of climate-driven changes will vary between subpopulations, with quantifiable negative effects being documented first in the more southerly subpopulations, such as those in Hudson Bay or the southern Beaufort Sea. As the bears' body condition declines, more seek alternate food resources so the frequency of conflicts between bears and humans increases. In the most northerly areas, thick multiyear ice, through which little light penetrates to stimulate biological growth on the underside, will be replaced by annual ice, which facilitates greater productivity and may create habitat more favorable to polar bears over continental shelf areas in the short term. If the climate continues to warm and eliminate sea ice as predicted, polar bears will largely disappear from the southern portions of their range by mid-century. They may persist in the northern Canadian Arctic Islands and northern Greenland for the foreseeable future, but their long-term viability, with a much reduced global population size in a remnant of their former range, is uncertain. © 2012 Blackwell Publishing Ltd.

  11. Biomechanical consequences of rapid evolution in the polar bear lineage.

    Directory of Open Access Journals (Sweden)

    Graham J Slater

    Full Text Available The polar bear is the only living ursid with a fully carnivorous diet. Despite a number of well-documented craniodental adaptations for a diet of seal flesh and blubber, molecular and paleontological data indicate that this morphologically distinct species evolved less than a million years ago from the omnivorous brown bear. To better understand the evolution of this dietary specialization, we used phylogenetic tests to estimate the rate of morphological specialization in polar bears. We then used finite element analysis (FEA to compare the limits of feeding performance in the polar bear skull to that of the phylogenetically and geographically close brown bear. Results indicate that extremely rapid evolution of semi-aquatic adaptations and dietary specialization in the polar bear lineage produced a cranial morphology that is weaker than that of brown bears and less suited to processing tough omnivorous or herbivorous diets. Our results suggest that continuation of current climate trends could affect polar bears by not only eliminating their primary food source, but also through competition with northward advancing, generalized brown populations for resources that they are ill-equipped to utilize.

  12. Acquired umbilical hernias in four captive polar bears (Ursus maritimus).

    Science.gov (United States)

    Velguth, Karen E; Rochat, Mark C; Langan, Jennifer N; Backues, Kay

    2009-12-01

    Umbilical hernias are a common occurrence in domestic animals and humans but have not been well documented in polar bears. Surgical reduction and herniorrhaphies were performed to correct acquired hernias in the region of the umbilicus in four adult captive polar bears (Ursus maritimus) housed in North American zoos. Two of the four bears were clinically unaffected by their hernias prior to surgery. One bear showed signs of severe discomfort following acute enlargement of the hernia. In another bear, re-herniation led to acute abdominal pain due to gastric entrapment and strangulation. The hernias in three bears were surgically repaired by debridement of the hernia ring and direct apposition of the abdominal wall, while the large defect in the most severely affected bear was closed using polypropylene mesh to prevent excessive tension. The cases in this series demonstrate that while small hernias may remain clinically inconsequential for long periods of time, enlargement or recurrence of the defect can lead to incarceration and acute abdominal crisis. Umbilical herniation has not been reported in free-ranging polar bears, and it is suspected that factors such as body condition, limited exercise, or enclosure design potentially contribute to the development of umbilical hernias in captive polar bears.

  13. Arctic wildlife sketches: Polar bear of the Northwest Territories

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This report covers the biology of the polar bear, specific to the Northwest Territories, Canada. Physical description, habitat and distribution, behavior, food,...

  14. Estimating the impacts of oil spills on polar bears

    Science.gov (United States)

    Durner, George M.; Amstrup, Steven C.; McDonald, Trent L.

    2000-01-01

    The polar bear is the apical predator and universal symbol of the Arctic. They occur throughout the Arctic marine environment wherever sea ice is prevalent. In the southern Beaufort Sea, polar bears are most common within the area of the outer continental shelf, where the hunt for seals along persistent leads and openings in the ice. Polar bears are a significant cultural and subsistence component of the lifestyles of indigenous people. They may also be one of the most important indicators of the health of the Arctic marine environment. Polar bears have a late age of maturation, a long inter0brth period, and small liter sizes. These life history features make polar bear populations susceptible to natural and human perturbations.Petroleum exploration and extraction have been in progress along the coast of northern Alaska for more than 25 years. Until recently, most activity has taken place on the mainland or at sites connected to the shore by a causeway. In 1999, BP Exploration-Alaska began constructing the first artificial production island designed to transport oil through sub-seafloor pipelines. Other similar projects have been proposed to begin in the next several years.The proximity of oil exploration and development to principal polar bear habitats raises concerns, and with the advent of true off-shore development projects, these concerns are compounded. Contact with oil and other industrial chemicals by polar bears, through grooming, consumption of tainted food, or direct consumption of chemicals, may be lethal. The active ice where polar bears hunt is also where spilled oil may be expected to concentrate during spring break-up and autumn freeze-up. Because of this, we could expect that an oil spill in the waters and ice of the continental shelf would have profound effects on polar bears. Assessments of the effects of spills, however, have not been done. This report described a promising method for estimating the effects of oil spills on polar bears in the

  15. Dietary biomagnification of organochlorine contaminants in Alaskan polar bears

    Science.gov (United States)

    Bentzen, T.W.; Follmann, E.H.; Amstrup, Steven C.; York, G.S.; Wooller, M.J.; Muir, D.C.G.; O'Hara, T. M.

    2008-01-01

    Concentrations of organochlorine contaminants in the adipose tissue of polar bears (Ursus maritimus Phipps, 1774) vary throughout the Arctic. The range in concentrations has not been explained fully by bear age, sex, condition, location, or reproductive status. Dietary pathways expose polar bears to a variety of contaminant profiles and concentrations. Prey range from lower trophic level bowhead whales (Balaena mysticetus L., 1758), one of the least contaminated marine mammals, to highly contaminated upper trophic level ringed seals (Phoca hispida (Schreber, 1775)). We used ??15N and ??13C signatures to estimate the trophic status of 42 polar bears sampled along Alaska's Beaufort Sea coast to determine the relationship between organochlorine concentration and trophic level. The ?? 15N values in the cellular portions of blood ranged from 18.2% to 20.7%. We found strong positive relationships between concentrations of the most recalcitrant polychlorinated biphenyls (PCBs) and ??15N values in models incorporating age, lipid content, and ??13C value. Specifically these models accounted for 67% and 76% of the variation in PCB153 and oxychlordane concentration in male polar bears and 85% and 93% in females, respectively. These results are strong indicators of variation in diet and biomagnification of organochlorines among polar bears related to their sex, age, and trophic position. ?? 2008 NRC.

  16. Polar bear use of a persistent food subsidy: insights from non-invasive genetic sampling in Alaska

    Science.gov (United States)

    Peacock, Elizabeth; Herreman, Jason

    2013-01-01

    Remains of bowhead whales (Balaena mysticetus) harvested by Iñupiat whalers are deposited in bone piles along the coast of Alaska and have become persistent and reliable food sources for polar bears (Ursus maritimus). The importance of bone piles to individuals and the population, the patterns of use, and the number, sex, and age of bears using these resources are poorly understood. We implemented barbed-wire hair snaring to obtain genetic identities from bears using the Point Barrow bone pile in winter 2010–11. Eighty-three percent of genotyped samples produced individual and sex identification. We identified 97 bears from 200 samples. Using genetic mark–recapture techniques, we estimated that 228 bears used the bone pile during November to February, which would represent approximately 15% of the Southern Beaufort Sea polar bear subpopulation, if all bears were from this subpopulation. We found that polar bears of all age and sex classes simultaneously used the bone pile. More males than females used the bone pile, and males predominated in February, likely because 1/3 of adult females would be denning during this period. On average, bears spent 10 days at the bone pile (median  =  5 days); the probability that an individual bear remained at the bone pile from week to week was 63% for females and 45% for males. Most bears in the sample were detected visiting the bone pile once or twice. We found some evidence of matrilineal fidelity to the bone pile, but the group of animals visiting the bone pile did not differ genetically from the Southern Beaufort Sea subpopulation, nor did patterns of relatedness. We demonstrate that bowhead whale bone piles may be an influential food subsidy for polar bears in the Barrow region in autumn and winter for all sex and age classes.

  17. Remote biopsy darting and marking of polar bears

    Science.gov (United States)

    Pagano, Anthony M.; Peacock, Elizabeth; McKinney, Melissa A.

    2014-01-01

    Remote biopsy darting of polar bears (Ursus maritimus) is less invasive and time intensive than physical capture and is therefore useful when capture is challenging or unsafe. We worked with two manufacturers to develop a combination biopsy and marking dart for use on polar bears. We had an 80% success rate of collecting a tissue sample with a single biopsy dart and collected tissue samples from 143 polar bears on land, in water, and on sea ice. Dye marks ensured that 96% of the bears were not resampled during the same sampling period, and we recovered 96% of the darts fired. Biopsy heads with 5 mm diameters collected an average of 0.12 g of fur, tissue, and subcutaneous adipose tissue, while biopsy heads with 7 mm diameters collected an average of 0.32 g. Tissue samples were 99.3% successful (142 of 143 samples) in providing a genetic and sex identification of individuals. We had a 64% success rate collecting adipose tissue and we successfully examined fatty acid signatures in all adipose samples. Adipose lipid content values were lower compared to values from immobilized or harvested polar bears, indicating that our method was not suitable for quantifying adipose lipid content.

  18. Simulating polar bear energetics during a seasonal fast using a mechanistic model.

    Directory of Open Access Journals (Sweden)

    Paul D Mathewson

    Full Text Available In this study we tested the ability of a mechanistic model (Niche Mapper™ to accurately model adult, non-denning polar bear (Ursus maritimus energetics while fasting during the ice-free season in the western Hudson Bay. The model uses a steady state heat balance approach, which calculates the metabolic rate that will allow an animal to maintain its core temperature in its particular microclimate conditions. Predicted weight loss for a 120 day fast typical of the 1990s was comparable to empirical studies of the population, and the model was able to reach a heat balance at the target metabolic rate for the entire fast, supporting use of the model to explore the impacts of climate change on polar bears. Niche Mapper predicted that all but the poorest condition bears would survive a 120 day fast under current climate conditions. When the fast extended to 180 days, Niche Mapper predicted mortality of up to 18% for males. Our results illustrate how environmental conditions, variation in animal properties, and thermoregulation processes may impact survival during extended fasts because polar bears were predicted to require additional energetic expenditure for thermoregulation during a 180 day fast. A uniform 3°C temperature increase reduced male mortality during a 180 day fast from 18% to 15%. Niche Mapper explicitly links an animal's energetics to environmental conditions and thus can be a valuable tool to help inform predictions of climate-related population changes. Since Niche Mapper is a generic model, it can make energetic predictions for other species threatened by climate change.

  19. "Where's the Bear? Over There!"--Creative Thinking and Imagination in Den Making

    Science.gov (United States)

    Canning, Natalie

    2013-01-01

    This small scale research project examines opportunities for creative thinking and imagination through den making in a rural private day nursery with its own woodland area on the borders of England and Wales in the UK. The research is underpinned by sociocultural theory and is an ethnographic study of non-participant observations of children aged…

  20. Genomic evidence for island population conversion resolves conflicting theories of polar bear evolution.

    Science.gov (United States)

    Cahill, James A; Green, Richard E; Fulton, Tara L; Stiller, Mathias; Jay, Flora; Ovsyanikov, Nikita; Salamzade, Rauf; St John, John; Stirling, Ian; Slatkin, Montgomery; Shapiro, Beth

    2013-01-01

    Despite extensive genetic analysis, the evolutionary relationship between polar bears (Ursus maritimus) and brown bears (U. arctos) remains unclear. The two most recent comprehensive reports indicate a recent divergence with little subsequent admixture or a much more ancient divergence followed by extensive admixture. At the center of this controversy are the Alaskan ABC Islands brown bears that show evidence of shared ancestry with polar bears. We present an analysis of genome-wide sequence data for seven polar bears, one ABC Islands brown bear, one mainland Alaskan brown bear, and a black bear (U. americanus), plus recently published datasets from other bears. Surprisingly, we find clear evidence for gene flow from polar bears into ABC Islands brown bears but no evidence of gene flow from brown bears into polar bears. Importantly, while polar bears contributed <1% of the autosomal genome of the ABC Islands brown bear, they contributed 6.5% of the X chromosome. The magnitude of sex-biased polar bear ancestry and the clear direction of gene flow suggest a model wherein the enigmatic ABC Island brown bears are the descendants of a polar bear population that was gradually converted into brown bears via male-dominated brown bear admixture. We present a model that reconciles heretofore conflicting genetic observations. We posit that the enigmatic ABC Islands brown bears derive from a population of polar bears likely stranded by the receding ice at the end of the last glacial period. Since then, male brown bear migration onto the island has gradually converted these bears into an admixed population whose phenotype and genotype are principally brown bear, except at mtDNA and X-linked loci. This process of genome erosion and conversion may be a common outcome when climate change or other forces cause a population to become isolated and then overrun by species with which it can hybridize.

  1. Genomic evidence for island population conversion resolves conflicting theories of polar bear evolution.

    Directory of Open Access Journals (Sweden)

    James A Cahill

    Full Text Available Despite extensive genetic analysis, the evolutionary relationship between polar bears (Ursus maritimus and brown bears (U. arctos remains unclear. The two most recent comprehensive reports indicate a recent divergence with little subsequent admixture or a much more ancient divergence followed by extensive admixture. At the center of this controversy are the Alaskan ABC Islands brown bears that show evidence of shared ancestry with polar bears. We present an analysis of genome-wide sequence data for seven polar bears, one ABC Islands brown bear, one mainland Alaskan brown bear, and a black bear (U. americanus, plus recently published datasets from other bears. Surprisingly, we find clear evidence for gene flow from polar bears into ABC Islands brown bears but no evidence of gene flow from brown bears into polar bears. Importantly, while polar bears contributed <1% of the autosomal genome of the ABC Islands brown bear, they contributed 6.5% of the X chromosome. The magnitude of sex-biased polar bear ancestry and the clear direction of gene flow suggest a model wherein the enigmatic ABC Island brown bears are the descendants of a polar bear population that was gradually converted into brown bears via male-dominated brown bear admixture. We present a model that reconciles heretofore conflicting genetic observations. We posit that the enigmatic ABC Islands brown bears derive from a population of polar bears likely stranded by the receding ice at the end of the last glacial period. Since then, male brown bear migration onto the island has gradually converted these bears into an admixed population whose phenotype and genotype are principally brown bear, except at mtDNA and X-linked loci. This process of genome erosion and conversion may be a common outcome when climate change or other forces cause a population to become isolated and then overrun by species with which it can hybridize.

  2. An experimental investigation of chemical communication in the polar bear

    Science.gov (United States)

    Owen, Megan A.; Swaisgood, Ronald R.; Slocomb, C.; Amstrup, Steven C.; Durner, George M.; Simac, Kristin; Pessier, Allan P.

    2015-01-01

    The polar bear (Ursus maritimus), with its wide-ranging movements, solitary existence and seasonal reproduction, is expected to favor chemosignaling over other communication modalities. However, the topography of its Arctic sea ice habitat is generally lacking in stationary vertical substrates routinely used for targeted scent marking in other bears. These environmental constraints may have shaped a marking strategy, unique to polar bears, for widely dispersed continuous dissemination of scent via foot pads. To investigate the role of chemical communication, pedal scents were collected from free-ranging polar bears of different sex and reproductive classes captured on spring sea ice in the Beaufort and Chukchi seas, and presented in a controlled fashion to 26 bears in zoos. Results from behavioral bioassays indicated that bears, especially females, were more likely to approach conspecific scent during the spring than the fall. Male flehmen behavior, indicative of chemosignal delivery to the vomeronasal organ, differentiated scent donor by sex and reproductive condition. Histologic examination of pedal skin collected from two females indicated prominent and profuse apocrine glands in association with large compound hair follicles, suggesting that they may produce scents that function as chemosignals. These results suggest that pedal scent, regardless of origin, conveys information to conspecifics that may facilitate social and reproductive behavior, and that chemical communication in this species has been adaptively shaped by environmental constraints of its habitat. However, continuously distributed scent signals necessary for breeding behavior may prove less effective if current and future environmental conditions cause disruption of scent trails due to increased fracturing of sea ice.

  3. Alaska polar bear harvest characteristics 1980-1982: Status report: Draft

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Polar bear harvests in Alaska coastal villages from November 1980 to April 1982. Hunters from 13 villages killed polar bears during this period. The documented...

  4. Habitat degradation affects the summer activity of polar bears

    Science.gov (United States)

    Ware, Jasmine V.; Rode, Karyn D.; Bromaghin, Jeffrey F.; Douglas, David C.; Wilson, Ryan R.; Regehr, Eric V.; Amstrup, Steven C.; Durner, George M.; Pagano, Anthony M.; Olson, Jay; Robbins, Charles T.; Jansen, Heiko T

    2017-01-01

    Understanding behavioral responses of species to environmental change is critical to forecasting population-level effects. Although climate change is significantly impacting species’ distributions, few studies have examined associated changes in behavior. Polar bear (Ursus maritimus) subpopulations have varied in their near-term responses to sea ice decline. We examined behavioral responses of two adjacent subpopulations to changes in habitat availability during the annual sea ice minimum using activity data. Location and activity sensor data collected from 1989 to 2014 for 202 adult female polar bears in the Southern Beaufort Sea (SB) and Chukchi Sea (CS) subpopulations were used to compare activity in three habitat types varying in prey availability: (1) land; (2) ice over shallow, biologically productive waters; and (3) ice over deeper, less productive waters. Bears varied activity across and within habitats with the highest activity at 50–75% sea ice concentration over shallow waters. On land, SB bears exhibited variable but relatively high activity associated with the use of subsistence-harvested bowhead whale carcasses, whereas CS bears exhibited low activity consistent with minimal feeding. Both subpopulations had fewer observations in their preferred shallow-water sea ice habitats in recent years, corresponding with declines in availability of this substrate. The substantially higher use of marginal habitats by SB bears is an additional mechanism potentially explaining why this subpopulation has experienced negative effects of sea ice loss compared to the still-productive CS subpopulation. Variability in activity among, and within, habitats suggests that bears alter their behavior in response to habitat conditions, presumably in an attempt to balance prey availability with energy costs.

  5. One-dimensional heat conduction equation of the polar bear hair

    Directory of Open Access Journals (Sweden)

    Zhu Wei-Hong

    2015-01-01

    Full Text Available Hairs of a polar bear (Ursus maritimus possess special membrane-pore structure. The structure enables the polar bear to survive in the harsh Arctic regions. In this paper, the membrane-pore structure be approximately considered as fractal space, 1-D heat conduction equation of the polar bear hair is established and the solution of the equation is obtained.

  6. Fractional model for heat conduction in polar bear hairs

    Directory of Open Access Journals (Sweden)

    Wang Qing-Li

    2012-01-01

    Full Text Available Time-fractional differential equations can accurately describe heat conduction in fractal media, such as wool fibers, goose down and polar bear hair. The fractional complex transform is used to convert time-fractional heat conduction equations with the modified Riemann-Liouville derivative into ordinary differential equations, and exact solutions can be easily obtained. The solution process is straightforward and concise.

  7. Serosurvey of selected zoonotic agents in polar bears (Ursus maritimus)

    Science.gov (United States)

    Rah, H.; Chomel, B.B.; Follmann, E.H.; Kasten, R.W.; Hew, C.H.; Farver, T.B.; Garner, G.W.; Amstrup, Steven C.

    2005-01-01

    Between 1982 and 1999 blood samples were collected from 500 polar bears (Ursus maritimus) captured in the Beaufort and Chukchi seas, to determine the seroprevalence of Brucella species, Toxoplasma gondii, and Trichinella species infections. The bears were classified into four age groups, cubs, yearlings, subadults and adults. Brucella and Toxoplasma antibodies were detected by agglutination (a buffered acidified card antigen and rapid automated presumptive test for brucellosis and a commercial latex agglutination test for toxoplasmosis); an ELISA was used to detect Thichinella antibodies. The overall seroprevalence of Brucella species was 5 per cent, and subadults and yearlings were 2.62 times (95 per cent confidence interval 1-02 to 6-82) more likely to be seropositive for Brucella species than adults and their cubs. The antibody prevalence for Toxoplasma gondii was 6 per cent, and for Trichinella species 55.6 per cent. The prevalence of antibodies to Trichinella species increased with age (P<0.001).

  8. High capacity implantable data recorders: system design and experience in canines and Denning black bears.

    Science.gov (United States)

    Laske, Timothy G; Harlow, Henry J; Werder, Jon C; Marshall, Mark T; Iaizzo, Paul A

    2005-11-01

    Implantable medical devices have increasingly large capacities for storing patient data as a diagnostic aid and to allow patient monitoring. Although these devices can store a significant amount of data, an increased ability for data storage was required for chronic monitoring in recent physiological studies. Novel high capacity implantable data recorders were designed for use in advanced physiological studies of canines and free-ranging black bears. These hermitically sealed titanium encased recorders were chronically implanted and programmed to record intrabody broadband electrical activity to monitor electrocardiograms and electromyograms, and single-axis acceleration to document relative activities. Changes in cardiac T-wave morphology were characterized in the canines over a 6 month period, providing new physiological data for the design of algorithms and filtering schemes that could be employed to avoid inappropriate implantable defibrillator shocks. Unique characteristics of bear hibernation physiology were successfully identified in the black bears, including: heart rate, respiratory rate, gross body movement, and shiver An unanticipated high rejection rate of these devices occurred in the bears, with five of six being externalized during the overwintering period, including two devices implanted in the peritoneal cavity. High capacity implantable data recorders were designed and utilized for the collection of long-term physiological data in both laboratory and extreme field environments. The devices described were programmable to accommodate the diverse research protocols. Additionally, we have described substantial differences in the response of two species to a common device. Variations in the foreign body response of different mammals must be identified and taken into consideration when choosing tissue-contacting materials in the application of biomedical technology to physiologic research.

  9. Climate change threatens polar bear populations: a stochastic demographic analysis.

    Science.gov (United States)

    Hunter, Christine M; Caswell, Hal; Runge, Michael C; Regehr, Eric V; Amstrup, Steve C; Stirling, Ian

    2010-10-01

    The polar bear (Ursus maritimus) depends on sea ice for feeding, breeding, and movement. Significant reductions in Arctic sea ice are forecast to continue because of climate warming. We evaluated the impacts of climate change on polar bears in the southern Beaufort Sea by means of a demographic analysis, combining deterministic, stochastic, environment-dependent matrix population models with forecasts of future sea ice conditions from IPCC general circulation models (GCMs). The matrix population models classified individuals by age and breeding status; mothers and dependent cubs were treated as units. Parameter estimates were obtained from a capture-recapture study conducted from 2001 to 2006. Candidate statistical models allowed vital rates to vary with time and as functions of a sea ice covariate. Model averaging was used to produce the vital rate estimates, and a parametric bootstrap procedure was used to quantify model selection and parameter estimation uncertainty. Deterministic models projected population growth in years with more extensive ice coverage (2001-2003) and population decline in years with less ice coverage (2004-2005). LTRE (life table response experiment) analysis showed that the reduction in lambda in years with low sea ice was due primarily to reduced adult female survival, and secondarily to reduced breeding. A stochastic model with two environmental states, good and poor sea ice conditions, projected a declining stochastic growth rate, log lambdas, as the frequency of poor ice years increased. The observed frequency of poor ice years since 1979 would imply log lambdas approximately - 0.01, which agrees with available (albeit crude) observations of population size. The stochastic model was linked to a set of 10 GCMs compiled by the IPCC; the models were chosen for their ability to reproduce historical observations of sea ice and were forced with "business as usual" (A1B) greenhouse gas emissions. The resulting stochastic population

  10. Demography and population status of polar bears in western Hudson Bay

    Science.gov (United States)

    Lunn, Nicholas J.; Regher, Eric V; Servanty, Sabrina; Converse, Sarah J.; Richardson, Evan S.; Stirling, Ian

    2013-01-01

    We evaluated the demography and population status of the Western Hudson Bay (WH) polar bear subpopulation for the period 1984-2011, using live-recapture data from research studies and management actions, and dead-recovery data from polar bears harvested for subsistence purposes or removed during human-bear conflicts.

  11. Population genomics reveal recent speciation and rapid evolutionary adaptation in polar bears

    DEFF Research Database (Denmark)

    Liu, Shiping; Lorenzen, Eline D.; Fumagalli, Matteo

    2014-01-01

    Polar bears are uniquely adapted to life in the High Arctic and have undergone drastic physiological changes in response to Arctic climates and a hyperlipid diet of primarily marine mammal prey. We analyzed 89 complete genomes of polar bear and brown bear using population genomic modeling and show...

  12. Ancestral polymorphisms and sex-biased migration shaped the demographic history of brown bears and polar bears.

    Directory of Open Access Journals (Sweden)

    Shigeki Nakagome

    Full Text Available Recent studies have reported discordant gene trees in the evolution of brown bears and polar bears. Genealogical histories are different among independent nuclear loci and between biparentally inherited autosomal DNA (aDNA and matrilineal mitochondrial DNA (mtDNA. Based on multi-locus genomic sequences from aDNA and mtDNA, we inferred the population demography of brown and polar bears and found that brown bears have 6 times (aDNA or more than 14 times (mtDNA larger population sizes than polar bears and that polar bear lineage is derived from within brown bear diversity. In brown bears, the effective population size ratio of mtDNA to aDNA was at least 0.62, which deviated from the expected value of 0.25, suggesting matriarchal population due to female philopatry and male-biased migration. These results emphasize that ancestral polymorphisms and sex-biased migration may have contributed to conflicting branching patterns in brown and polar bears across aDNA genes and mtDNA.

  13. Complete mitochondrial genome of a Pleistocene jawbone unveils the origin of polar bear.

    Science.gov (United States)

    Lindqvist, Charlotte; Schuster, Stephan C; Sun, Yazhou; Talbot, Sandra L; Qi, Ji; Ratan, Aakrosh; Tomsho, Lynn P; Kasson, Lindsay; Zeyl, Eve; Aars, Jon; Miller, Webb; Ingólfsson, Olafur; Bachmann, Lutz; Wiig, Oystein

    2010-03-16

    The polar bear has become the flagship species in the climate-change discussion. However, little is known about how past climate impacted its evolution and persistence, given an extremely poor fossil record. Although it is undisputed from analyses of mitochondrial (mt) DNA that polar bears constitute a lineage within the genetic diversity of brown bears, timing estimates of their divergence have differed considerably. Using next-generation sequencing technology, we have generated a complete, high-quality mt genome from a stratigraphically validated 130,000- to 110,000-year-old polar bear jawbone. In addition, six mt genomes were generated of extant polar bears from Alaska and brown bears from the Admiralty and Baranof islands of the Alexander Archipelago of southeastern Alaska and Kodiak Island. We show that the phylogenetic position of the ancient polar bear lies almost directly at the branching point between polar bears and brown bears, elucidating a unique morphologically and molecularly documented fossil link between living mammal species. Molecular dating and stable isotope analyses also show that by very early in their evolutionary history, polar bears were already inhabitants of the Artic sea ice and had adapted very rapidly to their current and unique ecology at the top of the Arctic marine food chain. As such, polar bears provide an excellent example of evolutionary opportunism within a widespread mammalian lineage.

  14. Complete mitochondrial genome of a Pleistocene jawbone unveils the origin of polar bear

    Science.gov (United States)

    Lindqvist, Charlotte; Schuster, Stephan C.; Sun, Yazhou; Talbot, Sandra L.; Qi, Ji; Ratan, Aakrosh; Tomsho, Lynn P.; Kasson, Lindsay; Zeyl, Eve; Aars, Jon; Miller, Webb; Ingólfsson, Ólafur; Bachmann, Lutz; Wiig, Øystein

    2010-01-01

    The polar bear has become the flagship species in the climate-change discussion. However, little is known about how past climate impacted its evolution and persistence, given an extremely poor fossil record. Although it is undisputed from analyses of mitochondrial (mt) DNA that polar bears constitute a lineage within the genetic diversity of brown bears, timing estimates of their divergence have differed considerably. Using next-generation sequencing technology, we have generated a complete, high-quality mt genome from a stratigraphically validated 130,000- to 110,000-year-old polar bear jawbone. In addition, six mt genomes were generated of extant polar bears from Alaska and brown bears from the Admiralty and Baranof islands of the Alexander Archipelago of southeastern Alaska and Kodiak Island. We show that the phylogenetic position of the ancient polar bear lies almost directly at the branching point between polar bears and brown bears, elucidating a unique morphologically and molecularly documented fossil link between living mammal species. Molecular dating and stable isotope analyses also show that by very early in their evolutionary history, polar bears were already inhabitants of the Artic sea ice and had adapted very rapidly to their current and unique ecology at the top of the Arctic marine food chain. As such, polar bears provide an excellent example of evolutionary opportunism within a widespread mammalian lineage.

  15. 77 FR 23432 - Endangered and Threatened Wildlife and Plants; Special Rule for the Polar Bear

    Science.gov (United States)

    2012-04-19

    ... garbage disposal and snow management procedures to reduce the attraction of polar bears, an outlined chain... bears. Deterrent strategies may include use of tools such as vehicles, vehicle horns, vehicle sirens...

  16. Using tri-axial accelerometers to identify wild polar bear behaviors

    Science.gov (United States)

    Pagano, Anthony M.; Rode, Karyn D.; Cutting, A.; Owen, M.A.; Jensen, S.; Ware, J.V.; Robbins, C.T.; Durner, George M.; Atwood, Todd C.; Obbard, M.E.; Middel, K.R.; Thiemann, G.W.; Williams, T.M.

    2017-01-01

    Tri-axial accelerometers have been used to remotely identify the behaviors of a wide range of taxa. Assigning behaviors to accelerometer data often involves the use of captive animals or surrogate species, as their accelerometer signatures are generally assumed to be similar to those of their wild counterparts. However, this has rarely been tested. Validated accelerometer data are needed for polar bears Ursus maritimus to understand how habitat conditions may influence behavior and energy demands. We used accelerometer and water conductivity data to remotely distinguish 10 polar bear behaviors. We calibrated accelerometer and conductivity data collected from collars with behaviors observed from video-recorded captive polar bears and brown bears U. arctos, and with video from camera collars deployed on free-ranging polar bears on sea ice and on land. We used random forest models to predict behaviors and found strong ability to discriminate the most common wild polar bear behaviors using a combination of accelerometer and conductivity sensor data from captive or wild polar bears. In contrast, models using data from captive brown bears failed to reliably distinguish most active behaviors in wild polar bears. Our ability to discriminate behavior was greatest when species- and habitat-specific data from wild individuals were used to train models. Data from captive individuals may be suitable for calibrating accelerometers, but may provide reduced ability to discriminate some behaviors. The accelerometer calibrations developed here provide a method to quantify polar bear behaviors to evaluate the impacts of declines in Arctic sea ice.

  17. Sea-ice indicators of polar bear habitat

    Science.gov (United States)

    Stern, Harry L.; Laidre, Kristin L.

    2016-09-01

    Nineteen subpopulations of polar bears (Ursus maritimus) are found throughout the circumpolar Arctic, and in all regions they depend on sea ice as a platform for traveling, hunting, and breeding. Therefore polar bear phenology - the cycle of biological events - is linked to the timing of sea-ice retreat in spring and advance in fall. We analyzed the dates of sea-ice retreat and advance in all 19 polar bear subpopulation regions from 1979 to 2014, using daily sea-ice concentration data from satellite passive microwave instruments. We define the dates of sea-ice retreat and advance in a region as the dates when the area of sea ice drops below a certain threshold (retreat) on its way to the summer minimum or rises above the threshold (advance) on its way to the winter maximum. The threshold is chosen to be halfway between the historical (1979-2014) mean September and mean March sea-ice areas. In all 19 regions there is a trend toward earlier sea-ice retreat and later sea-ice advance. Trends generally range from -3 to -9 days decade-1 in spring and from +3 to +9 days decade-1 in fall, with larger trends in the Barents Sea and central Arctic Basin. The trends are not sensitive to the threshold. We also calculated the number of days per year that the sea-ice area exceeded the threshold (termed ice-covered days) and the average sea-ice concentration from 1 June through 31 October. The number of ice-covered days is declining in all regions at the rate of -7 to -19 days decade-1, with larger trends in the Barents Sea and central Arctic Basin. The June-October sea-ice concentration is declining in all regions at rates ranging from -1 to -9 percent decade-1. These sea-ice metrics (or indicators of habitat change) were designed to be useful for management agencies and for comparative purposes among subpopulations. We recommend that the National Climate Assessment include the timing of sea-ice retreat and advance in future reports.

  18. An analysis of heat conduction in polar bear hairs using one-dimensional fractional model

    Directory of Open Access Journals (Sweden)

    Zhu Wei-Hong

    2016-01-01

    Full Text Available Hairs of a polar bear are of superior properties such as the excellent thermal protection. The polar bears can perennially live in an extremely cold environment and can maintain body temperature at around 37 °C. Why do polar bears can resist such cold environment? Its membrane-pore structure plays an important role. In the previous work, we established a 1-D fractional heat conduction equation to reveal the hidden mechanism for the hairs. In this paper, we further discuss solutions and parameters of the equation established and analyze heat conduction in polar bear hairs.

  19. Ancient Hybridization and an Irish Origin for the Modern Polar Bear Matriline

    Science.gov (United States)

    Edwards, Ceiridwen J.; Suchard, Marc A.; Lemey, Philippe; Welch, John J.; Barnes, Ian; Fulton, Tara L.; Barnett, Ross; O’Connell, Tamsin C.; Coxon, Peter; Monaghan, Nigel; Valdiosera, Cristina E.; Lorenzen, Eline D.; Willerslev, Eske; Baryshnikov, Gennady F.; Rambaut, Andrew; Thomas, Mark G.; Bradley, Daniel G.; Shapiro, Beth

    2015-01-01

    Summary Background Polar bears (Ursus maritimus) are among those species most susceptible to the rapidly changing arctic climate, and their survival is of global concern. Despite this, little is known about polar bear species history. Future conservation strategies would significantly benefit from an understanding of basic evolutionary information, such as the timing and conditions of their initial divergence from brown bears (U. arctos) or their response to previous environmental change. Results We used a spatially explicit phylogeographic model to estimate the dynamics of 242 brown bear and polar bear matrilines sampled throughout the last 120,000 years and across their present and past geographic ranges. Our results show that the present distribution of these matrilines was shaped by a combination of regional stability and rapid, long-distance dispersal from ice-age refugia. In addition, hybridization between polar bears and brown bears may have occurred multiple times throughout the Late Pleistocene. Conclusions The reconstructed matrilineal history of brown and polar bears has two striking features. First, it is punctuated by dramatic and discrete climate-driven dispersal events. Second, opportunistic mating between these two species as their ranges overlapped has left a strong genetic imprint. In particular, a likely genetic exchange with extinct Irish brown bears forms the origin of the modern polar bear matriline. This suggests that interspecific hybridization not only may be more common than previously considered but may be a mechanism by which species deal with marginal habitats during periods of environmental deterioration. PMID:21737280

  20. Polar Bears Exhibit Genome-Wide Signatures of Bioenergetic Adaptation to Life in the Arctic Environment

    Science.gov (United States)

    Welch, Andreanna J.; Carretero-Paulet, Lorenzo; Miller, Webb; Rode, Karyn D.; Lindqvist, Charlotte

    2014-01-01

    Polar bears (Ursus maritimus) face extremely cold temperatures and periods of fasting, which might result in more severe energetic challenges than those experienced by their sister species, the brown bear (U. arctos). We have examined the mitochondrial and nuclear genomes of polar and brown bears to investigate whether polar bears demonstrate lineage-specific signals of molecular adaptation in genes associated with cellular respiration/energy production. We observed increased evolutionary rates in the mitochondrial cytochrome c oxidase I gene in polar but not brown bears. An amino acid substitution occurred near the interaction site with a nuclear-encoded subunit of the cytochrome c oxidase complex and was predicted to lead to a functional change, although the significance of this remains unclear. The nuclear genomes of brown and polar bears demonstrate different adaptations related to cellular respiration. Analyses of the genomes of brown bears exhibited substitutions that may alter the function of proteins that regulate glucose uptake, which could be beneficial when feeding on carbohydrate-dominated diets during hyperphagia, followed by fasting during hibernation. In polar bears, genes demonstrating signatures of functional divergence and those potentially under positive selection were enriched in functions related to production of nitric oxide (NO), which can regulate energy production in several different ways. This suggests that polar bears may be able to fine-tune intracellular levels of NO as an adaptive response to control trade-offs between energy production in the form of adenosine triphosphate versus generation of heat (thermogenesis). PMID:24504087

  1. Polar bears exhibit genome-wide signatures of bioenergetic adaptation to life in the Arctic environment

    Science.gov (United States)

    Welch, Andreanna J.; Bedoya-Reina, Oscar C.; Carretero-Paulet, Lorenzo; Miller, Webb; Rode, Karyn D.; Lindqvist, Charlotte

    2014-01-01

    Polar bears (Ursus maritimus) face extremely cold temperatures and periods of fasting, which might result in more severe energetic challenges than those experienced by their sister species, the brown bear (U. arctos). We have examined the mitochondrial and nuclear genomes of polar and brown bears to investigate if polar bears demonstrate lineage-specific signals of molecular adaptation in genes associated with cellular respiration/energy production. We observed increased evolutionary rates in the mitochondrial cytochrome c oxidase I gene in polar but not brown bears. An amino acid substitution occurred near the interaction site with a nuclear-encoded subunit of the cytochrome c oxidase complex, and was predicted to lead to a functional change, although the significance of this remains unclear. The nuclear genomes of brown and polar bears demonstrate different adaptations related to cellular respiration. Analyses of the genomes of brown bears exhibited substitutions that may alter the function of proteins that regulate glucose uptake, which could be beneficial when feeding on carbohydrate-dominated diets during hyperphagia, followed by fasting during hibernation. In polar bears, genes demonstrating signatures of functional divergence and those potentially under positive selection were enriched in functions related to production of nitric oxide, which can regulate energy production in several different ways. This suggests that polar bears may be able to fine-tune intracellular levels of nitric oxide as an adaptive response to control trade-offs between energy production in the form of ATP versus generation of heat (thermogenesis).

  2. Rebuttal of "Polar bear population forecasts: a public-policy forecasting audit"

    Science.gov (United States)

    Steven C. Amstrup; Hal Caswell; Eric DeWeaver; Ian Stirling; David C. Douglas; Bruce G. Marcot; Christine M. Hunter

    2009-01-01

    Observed declines in the Arctic sea ice have resulted in a variety of negative effects on polar bears (Ursus maritimus). Projections for additional future declines in sea ice resulted in a proposal to list polar bears as a threatened species under the United States Endangered Species Act. To provide information for the Department of the Interior...

  3. 50 CFR 18.30 - Polar bear sport-hunted trophy import permits.

    Science.gov (United States)

    2010-10-01

    ... IMPORTATION OF WILDLIFE AND PLANTS (CONTINUED) MARINE MAMMALS Special Exceptions § 18.30 Polar bear sport-hunted trophy import permits. (a) Application procedure. You, as the hunter or heir of the hunter's... deceased hunter took the polar bear as a personal sport-hunted trophy; (ii) You will use the trophy only...

  4. Circumpolar contaminant concentrations in polar bears (Ursus maritimus) and potential population-level effects

    NARCIS (Netherlands)

    Nuijten, R.J.M.; Hendriks, A.J.; Jenssen, B.M.; Schipper, A.M.

    2016-01-01

    Abstract Polar bears (Ursus maritimus) currently receive much attention in the context of global climate change. However, there are other stressors that might threaten the viability of polar bear populations as well, such as exposure to anthropogenic pollutants. Lipophilic organic compounds bio-accu

  5. Circumpolar contaminant concentrations in polar bears (Ursus maritimus) and potential population-level effects

    NARCIS (Netherlands)

    Nuijten, R.J.M.; Hendriks, A.J.; Jenssen, B.M.; Schipper, A.M.

    2016-01-01

    Abstract Polar bears (Ursus maritimus) currently receive much attention in the context of global climate change. However, there are other stressors that might threaten the viability of polar bear populations as well, such as exposure to anthropogenic pollutants. Lipophilic organic compounds

  6. PREVALENCE OF ANTIBODIES AGAINST TOXOPLASMA GONDII IN POLAR BEARS (URSUS MARITIMUS) FROM SVALBARD AND EAST GREENLAND

    Science.gov (United States)

    Serum samples from 419 polar bears (Ursus maritimus) from Svalbard and the Barents Sea (collected 1990 - 2000) and 108 polar bears from East Greenland (collected 1999 - 2004) were assayed for antibodies against Toxoplasma gondii using the modified agglutination test (MAT). Antibody prevalences were ...

  7. A new fractional derivative and its application to explanation of polar bear hairs

    Directory of Open Access Journals (Sweden)

    Ji-Huan He

    2016-04-01

    Full Text Available A new fractional derivative is defined through the variational iteration method, and its application in explaining the excellent thermal protection of polar bear hairs is elucidated. The fractal porosity of its inner structure makes a polar bear mathematically adapted for living in a harsh Arctic region.

  8. Ancient hybridization and an Irish origin for the modern polar bear matriline

    DEFF Research Database (Denmark)

    Edwards, Ceiridwen J.; Suchard, Marc A.; Lemey, Philippe

    2011-01-01

    Polar bears (Ursus maritimus) are among those species most susceptible to the rapidly changing arctic climate, and their survival is of global concern. Despite this, little is known about polar bear species history. Future conservation strategies would significantly benefit from an understanding ...

  9. Variation in winter diet of southern Beaufort Sea polar bears inferred from stable isotope analysis

    Science.gov (United States)

    Bentzen, T.W.; Follmann, E.H.; Amstrup, Steven C.; York, G.S.; Wooller, M.J.; O'Hara, T. M.

    2007-01-01

    Ringed seals (Phoca hispida Schreber, 1775 = Pusa hispida (Schreber, 1775)) and bearded seals (Erignathus barbatus (Erxleben, 1777)) represent the majority of the polar bear (Ursus maritimus Phipps, 1774) annual diet. However, remains of lower trophic level bowhead whales (Balaena mysticetus L., 1758) are available in the southern Beaufort Sea and their dietary contribution to polar bears has been unknown. We used stable isotope (13C/12C, δ13C, 15N/14N, and δ15N) analysis to determine the diet composition of polar bears sampled along Alaska’s Beaufort Sea coast in March and April 2003 and 2004. The mean δ15N values of polar bear blood cells were 19.5‰ (SD = 0.7‰) in 2003 and 19.9‰ (SD = 0.7‰) in 2004. Mixing models indicated bowhead whales composed 11%–26% (95% CI) of the diets of sampled polar bears in 2003, and 0%–14% (95% CI) in 2004. This suggests significant variability in the proportion of lower trophic level prey in polar bear diets among individuals and between years. Polar bears depend on sea ice for hunting seals, and the temporal and spatial availabilities of sea ice are projected to decline. Consumption of low trophic level foods documented here suggests bears may increasingly scavenge such foods in the future.

  10. Climate change and the increasing impact of polar bears on bird populations

    Directory of Open Access Journals (Sweden)

    Jouke eProp

    2015-03-01

    Full Text Available The Arctic is becoming warmer at a high rate, and contractions in the extent of sea ice are currently changing the habitats of marine top-predators dependent on ice. Polar bears (Ursus maritimus depend on sea ice for hunting seals. For these top-predators, longer ice-free seasons are hypothesized to force the bears to hunt for alternative terrestrial food, such as eggs from colonial breeding birds. We analyzed time-series of polar bear observations at four locations on Spitsbergen (Svalbard and one in east Greenland. Summer occurrence of polar bears, measured as the probability of encountering bears and the number of days with bear presence, has increased significantly from the 1970/80s to the present. The shifts in polar bear occurrence coincided with trends for shorter sea ice seasons and less sea ice during the spring in the study area. This resulted in a strong inverse relationship between the probability of bear encounters on land and the length of the sea ice season. Within ten years after their first appearance on land, polar bears had advanced their arrival dates by almost 30 days. Direct observations of nest predation showed that polar bears may severely affect reproductive success of the barnacle goose (Branta leucopsis, common eider (Somateria mollissima and glaucous gull (Larus hyperboreus. Nest predation was strongest in years when the polar bears arrived well before hatch, with more than 90% of all nests being predated. The results are similar to findings from Canada, and large-scale processes, such as climate and subsequent habitat changes, are pinpointed as the most likely drivers in various parts of the Arctic. We suggest that the increasing, earlier appearance of bears on land in summer reflects behavioral adaptations by a small segment of the population to cope with a reduced hunting range on sea ice. This exemplifies how behavioral adaptations may contribute to the cascading effects of climate change.

  11. 75 FR 76085 - Endangered and Threatened Wildlife and Plants; Designation of Critical Habitat for the Polar Bear...

    Science.gov (United States)

    2010-12-07

    ... year, is an important part of the polar bear life- history strategy. In other regions, where ice is...,'' should include some reference to polar bear use of human refuse dumps and attraction to camps due to...

  12. Enlarged clitoris in wild polar bears (Ursus maritimus) can be misdiagnosed as pseudohermaphroditism

    DEFF Research Database (Denmark)

    Sonne, C; Leifsson, P S; Dietz, R

    2004-01-01

    A 23-year-old female polar bear (Ursus maritimus) killed in an Inuit hunt in East Greenland on July 9, 1999 had a significantly enlarged clitoris resembling, in size, form and colour, those of previously reported 'pseudohermaphroditic' polar bears from Svalbard. It has been suggested that an enzyme...... and internal reproductive organs of the present were similar to a reference group of 23 normal adult female polar bears from East Greenland collected in 1999-2002. The aberrant bear was a female genotype, and macroscopic examination of her internal reproductive organs indicated that she was reproductively....... It is hence possible that the previously reported adult female polar bear pseudohermaphrodites from Svalbard are in fact misdiagnoses. Therefore, future studies examining pseudohermaphroditism in wildlife should consider that certain occurrences are natural events, e.g., enlarged clitoris in the present East...

  13. Projected polar bear sea ice habitat in the Canadian Arctic Archipelago.

    Directory of Open Access Journals (Sweden)

    Stephen G Hamilton

    Full Text Available Sea ice across the Arctic is declining and altering physical characteristics of marine ecosystems. Polar bears (Ursus maritimus have been identified as vulnerable to changes in sea ice conditions. We use sea ice projections for the Canadian Arctic Archipelago from 2006 - 2100 to gain insight into the conservation challenges for polar bears with respect to habitat loss using metrics developed from polar bear energetics modeling.Shifts away from multiyear ice to annual ice cover throughout the region, as well as lengthening ice-free periods, may become critical for polar bears before the end of the 21st century with projected warming. Each polar bear population in the Archipelago may undergo 2-5 months of ice-free conditions, where no such conditions exist presently. We identify spatially and temporally explicit ice-free periods that extend beyond what polar bears require for nutritional and reproductive demands.Under business-as-usual climate projections, polar bears may face starvation and reproductive failure across the entire Archipelago by the year 2100.

  14. Establishing a definition of polar bear (Ursus maritimus) health: A guide to research and management activities

    Science.gov (United States)

    Patyk, Kelly A.; Duncan, Colleen G.; Nol, Pauline; Sonne, C.; Laidre, Kristin L.; Obbard, Martyn E.; Wiig, Øystein; Aars, Jon; Regehr, Eric V.; Gustafson, L.; Atwood, Todd C.

    2015-01-01

    The meaning of health for wildlife and perspectives on how to assess and measure health, are not well characterized. For wildlife at risk, such as some polar bear (Ursus maritimus) subpopulations, establishing comprehensive monitoring programs that include health status is an emerging need. Environmental changes, especially loss of sea ice habitat, have raised concern about polar bear health. Effective and consistent monitoring of polar bear health requires an unambiguous definition of health. We used the Delphi method of soliciting and interpreting expert knowledge to propose a working definition of polar bear health and to identify current concerns regarding health, challenges in measuring health, and important metrics for monitoring health. The expert opinion elicited through the exercise agreed that polar bear health is defined by characteristics and knowledge at the individual, population, and ecosystem level. The most important threats identified were in decreasing order: climate change, increased nutritional stress, chronic physiological stress, harvest management, increased exposure to contaminants, increased frequency of human interaction, diseases and parasites, and increased exposure to competitors. Fifteen metrics were identified to monitor polar bear health. Of these, indicators of body condition, disease and parasite exposure, contaminant exposure, and reproductive success were ranked as most important. We suggest that a cumulative effects approach to research and monitoring will improve the ability to assess the biological, ecological, and social determinants of polar bear health and provide measurable objectives for conservation goals and priorities and to evaluate progress.

  15. Polarization-Modulation Method of Measuring the Bearing of a Moving Object From Orthogonal Elliptically Polarized Signals of a Radio Beacon

    Science.gov (United States)

    Gulko, V. L.; Mescheryakov, A. A.

    2017-05-01

    A polarization-modulation method of estimating the bearing of a moving object using a radio beacon transmitting two mutually orthogonal elliptically polarized radio signals is considered. The signals received onboard the moving object are subject to polarization modulation. The bearing is estimated at the output from a single-channel receiver at the frequency multiple to the polarization modulation frequency.

  16. Per- and polyfluoroalkyl substances (PFASs) - New endocrine disruptors in polar bears (Ursus maritimus)?

    Science.gov (United States)

    Pedersen, Kathrine Eggers; Letcher, Robert J; Sonne, Christian; Dietz, Rune; Styrishave, Bjarne

    2016-11-01

    Per- and polyfluoroalkyl substances (PFASs) are emerging in the Arctic and accumulate in brain tissues of East Greenland (EG) polar bears. In vitro studies have shown that PFASs might possess endocrine disrupting abilities and therefore the present study was conducted to investigate potential PFAS induced alterations in brain steroid concentrations. The concentrations of eleven steroid hormones were determined in eight brain regions from ten EG polar bears. Pregnenolone (PRE), the dominant progestagen, was found in mean concentrations of 5-47ng/g (ww) depending on brain region. PRE showed significantly (pendocrine system of polar bears and potentially other mammal species.

  17. Factors affecting date of implantation, parturition, and den entry estimated from activity and body temperature in free-ranging brown bears.

    Directory of Open Access Journals (Sweden)

    Andrea Friebe

    Full Text Available Knowledge of factors influencing the timing of reproduction is important for animal conservation and management. Brown bears (Ursus arctos are able to vary the birth date of their cubs in response to their fat stores, but little information is available about the timing of implantation and parturition in free-ranging brown bears. Body temperature and activity of pregnant brown bears is higher during the gestation period than during the rest of hibernation and drops at parturition. We compared mean daily body temperature and activity levels of pregnant and nonpregnant females during preimplantation, gestation, and lactation. Additionally we tested whether age, litter size, primiparity, environmental conditions, and the start of hibernation influence the timing of parturition. The mean date of implantation was 1 December (SD = 12, the mean date of parturition was 26 January (SD = 12, and the mean duration of the gestation period was 56 days (SD = 2. The body temperature of pregnant females was higher during the gestation and lactation periods than that of nonpregnant bears. The body temperature of pregnant females decreased during the gestation period. Activity recordings were also used to determine the date of parturition. The parturition dates calculated with activity and body temperature data did not differ significantly and were the same in 50% of the females. Older females started hibernation earlier. The start of hibernation was earlier during years with favorable environmental conditions. Dates of parturition were later during years with good environmental conditions which was unexpected. We suggest that free-ranging pregnant brown bears in areas with high levels of human activities at the beginning of the denning period, as in our study area, might prioritize investing energy in early denning than in early parturition during years with favorable environmental conditions, as a strategy to prevent disturbances caused by human.

  18. Factors affecting date of implantation, parturition, and den entry estimated from activity and body temperature in free-ranging brown bears.

    Science.gov (United States)

    Friebe, Andrea; Evans, Alina L; Arnemo, Jon M; Blanc, Stéphane; Brunberg, Sven; Fleissner, Günther; Swenson, Jon E; Zedrosser, Andreas

    2014-01-01

    Knowledge of factors influencing the timing of reproduction is important for animal conservation and management. Brown bears (Ursus arctos) are able to vary the birth date of their cubs in response to their fat stores, but little information is available about the timing of implantation and parturition in free-ranging brown bears. Body temperature and activity of pregnant brown bears is higher during the gestation period than during the rest of hibernation and drops at parturition. We compared mean daily body temperature and activity levels of pregnant and nonpregnant females during preimplantation, gestation, and lactation. Additionally we tested whether age, litter size, primiparity, environmental conditions, and the start of hibernation influence the timing of parturition. The mean date of implantation was 1 December (SD = 12), the mean date of parturition was 26 January (SD = 12), and the mean duration of the gestation period was 56 days (SD = 2). The body temperature of pregnant females was higher during the gestation and lactation periods than that of nonpregnant bears. The body temperature of pregnant females decreased during the gestation period. Activity recordings were also used to determine the date of parturition. The parturition dates calculated with activity and body temperature data did not differ significantly and were the same in 50% of the females. Older females started hibernation earlier. The start of hibernation was earlier during years with favorable environmental conditions. Dates of parturition were later during years with good environmental conditions which was unexpected. We suggest that free-ranging pregnant brown bears in areas with high levels of human activities at the beginning of the denning period, as in our study area, might prioritize investing energy in early denning than in early parturition during years with favorable environmental conditions, as a strategy to prevent disturbances caused by human.

  19. A novel endogenous betaretrovirus group characterized from polar bears (Ursus maritimus) and giant pandas (Ailuropoda melanoleuca).

    Science.gov (United States)

    Mayer, Jens; Tsangaras, Kyriakos; Heeger, Felix; Avila-Arcos, María; Stenglein, Mark D; Chen, Wei; Sun, Wei; Mazzoni, Camila J; Osterrieder, Nikolaus; Greenwood, Alex D

    2013-08-15

    Transcriptome analysis of polar bears (Ursus maritimus) yielded sequences with highest similarity to the human endogenous retrovirus group HERV-K(HML-2). Further analysis of the polar bear draft genome identified an endogenous betaretrovirus group comprising 26 proviral copies and 231 solo LTRs. Molecular dating indicates the group originated before the divergence of bears from a common ancestor but is not present in all carnivores. Closely related sequences were identified in the giant panda (Ailuropoda melanoleuca) and characterized from its genome. We have designated the polar bear and giant panda sequences U. maritimus endogenous retrovirus (UmaERV) and A. melanoleuca endogenous retrovirus (AmeERV), respectively. Phylogenetic analysis demonstrated that the bear virus group is nested within the HERV-K supergroup among bovine and bat endogenous retroviruses suggesting a complex evolutionary history within the HERV-K group. All individual remnants of proviral sequences contain numerous frameshifts and stop codons and thus, the virus is likely non-infectious.

  20. Demography and behavior of polar bears feeding on stranded marine mammal carcasses

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — In 2001, the Minerals Management Service (MMS) funded a study to increase understanding of foraging and carcass utilization patterns of polar bears using the near...

  1. Some data on the polar bear and its utilization in the Canadian Arctic

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Some data have been collected on the polar bear kill and its utilization, based on information from 14 to 26 coastal settlements in the Canadian Arctic. Tt seems...

  2. A preliminary report on the status of polar bear in Alaska

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The circumpolar population and cross border movement of polar bears are significant features of their distribution. Although use of aircraft has increased hunting...

  3. Animal physiology. Summer declines in activity and body temperature offer polar bears limited energy savings.

    Science.gov (United States)

    Whiteman, J P; Harlow, H J; Durner, G M; Anderson-Sprecher, R; Albeke, S E; Regehr, E V; Amstrup, S C; Ben-David, M

    2015-07-17

    Polar bears (Ursus maritimus) summer on the sea ice or, where it melts, on shore. Although the physiology of "ice" bears in summer is unknown, "shore" bears purportedly minimize energy losses by entering a hibernation-like state when deprived of food. Such a strategy could partially compensate for the loss of on-ice foraging opportunities caused by climate change. However, here we report gradual, moderate declines in activity and body temperature of both shore and ice bears in summer, resembling energy expenditures typical of fasting, nonhibernating mammals. Also, we found that to avoid unsustainable heat loss while swimming, bears employed unusual heterothermy of the body core. Thus, although well adapted to seasonal ice melt, polar bears appear susceptible to deleterious declines in body condition during the lengthening period of summer food deprivation.

  4. Per- and polyfluoroalkyl substances (PFASs) – New endocrine disruptors in polar bears (Ursus maritimus)?

    DEFF Research Database (Denmark)

    Pedersen, Kathrine Eggers; Letcher, Robert J.; Sonne, Christian

    2016-01-01

    Per- and polyfluoroalkyl substances (PFASs) are emerging in the Arctic and accumulate in brain tissues of East Greenland (EG) polar bears. In vitro studies have shown that PFASs might possess endocrine disrupting abilities and therefore the present study was conducted to investigate potential PFAS...... dimorph brain function. The present work indicates an urgent need for a better mechanistic understanding of how PFASs may affect the endocrine system of polar bears and potentially other mammal species....

  5. Predicting 21st-century polar bear habitat distribution from global climate models

    Science.gov (United States)

    Durner, G.M.; Douglas, D.C.; Nielson, R.M.; Amstrup, Steven C.; McDonald, T.L.; Stirling, I.; Mauritzen, Mette; Born, E.W.; Wiig, O.; Deweaver, E.; Serreze, M.C.; Belikov, Stanislav; Holland, M.M.; Maslanik, J.; Aars, J.; Bailey, D.A.; Derocher, A.E.

    2009-01-01

    Projections of polar bear (Ursus maritimus) sea ice habitat distribution in the polar basin during the 21st century were developed to understand the consequences of anticipated sea ice reductions on polar bear populations. We used location data from satellitecollared polar bears and environmental data (e.g., bathymetry, distance to coastlines, and sea ice) collected from 1985 to 1995 to build resource selection functions (RSFs). RSFs described habitats that polar bears preferred in summer, autumn, winter, and spring. When applied to independent data from 1996 to 2006, the RSFs consistently identified habitats most frequently used by polar bears. We applied the RSFs to monthly maps of 21st-century sea ice concentration projected by 10 general circulation models (GCMs) used in the Intergovernmental Panel of Climate Change Fourth Assessment Report, under the A1B greenhouse gas forcing scenario. Despite variation in their projections, all GCMs indicated habitat losses in the polar basin during the 21st century. Losses in the highest-valued RSF habitat (optimal habitat) were greatest in the southern seas of the polar basin, especially the Chukchi and Barents seas, and least along the Arctic Ocean shores of Banks Island to northern Greenland. Mean loss of optimal polar bear habitat was greatest during summer; from an observed 1.0 million km2 in 1985-1995 (baseline) to a projected multi-model mean of 0.32 million km2 in 2090-2099 (-68% change). Projected winter losses of polar bear habitat were less: from 1.7 million km2 in 1985-1995 to 1.4 million km2 in 2090-2099 (-17% change). Habitat losses based on GCM multi-model means may be conservative; simulated rates of habitat loss during 1985-2006 from many GCMs were less than the actual observed rates of loss. Although a reduction in the total amount of optimal habitat will likely reduce polar bear populations, exact relationships between habitat losses and population demographics remain unknown. Density and energetic

  6. Xenoestrogenic and dioxin-like activity in blood of East Greenland polar bears (Ursus maritimus)

    DEFF Research Database (Denmark)

    Erdmann, Simon Erik; Dietz, Rune; Sonne, Christian;

    2013-01-01

    induced ER response. Positive correlations were found in subadult bears between XER and several POP biomarkers. XER and XERcomp correlated positively to each other. A total of 91% of the polar bear blood extracts elicited agonistic AhR transactivity. The AhR-TCDD equivalent (AhR-TEQ) median levels were...

  7. Penile density and globally used chemicals in Canadian and Greenland polar bears

    DEFF Research Database (Denmark)

    Sonne, Christian; Dyck, Markus; Rigét, Frank F

    2015-01-01

    could be in a range that may lead to disruption of normal reproduction and development. It is therefore likely that EDCs directly affect development and bone density in polar bears. Canadian bears had in general the best health and the North East Greenland subpopulation being at the highest risk...

  8. Comparison of methanol and isopropanol as wash solvents for determination of hair cortisol concentration in grizzly bears and polar bears.

    Science.gov (United States)

    Kroshko, Thomas; Kapronczai, Luciene; Cattet, Marc R L; Macbeth, Bryan J; Stenhouse, Gordon B; Obbard, Martyn E; Janz, David M

    2017-01-01

    Methodological differences among laboratories are recognized as significant sources of variation in quantification of hair cortisol concentration (HCC). An important step in processing hair, particularly when collected from wildlife, is the choice of solvent used to remove or "wash" external hair shaft cortisol prior to quantification of HCC. The present study systematically compared methanol and isopropanol as wash solvents for their efficiency at removing external cortisol without extracting internal hair shaft cortisol in samples collected from free-ranging grizzly bears and polar bears. Cortisol concentrations in solvents and hair were determined in each of one to eight washes of hair with each solvent independently. •There were no significant decreases in internal hair shaft cortisol among all eight washes for either solvent, although methanol removed detectable hair surface cortisol after one wash in grizzly bear hair whereas hair surface cortisol was detected in all eight isopropanol washes.•There were no significant differences in polar bear HCC washed one to eight times with either solvent, but grizzly bear HCC was significantly greater in hair washed with isopropanol compared to methanol.•There were significant differences in HCC quantified using different commercial ELISA kits commonly used for HCC determinations.

  9. White-beaked dolphins trapped in the ice and eaten by polar bears

    Directory of Open Access Journals (Sweden)

    Jon Aars

    2015-06-01

    Full Text Available Polar bears (Ursus maritimus depend on sea ice, where they hunt ice-associated seals. However, they are opportunistic predators and scavengers with a long list of known prey species. Here we report from a small fjord in Svalbard, Norwegian High Arctic, a sighting of an adult male polar bear preying on two white-beaked dolphins (Lagenorhynchus albirostris on 23 April 2014. This is the first record of this species as polar bear prey. White-beaked dolphins are frequent visitors to Svalbard waters in summer, but have not previously been reported this far north in early spring. We suggest they were trapped in the ice after strong northerly winds the days before, and possibly killed when forced to surface for air at a small opening in the ice. The bear had consumed most parts of one dolphin. When observed he was in the process of covering the mostly intact second dolphin with snow. Such caching behaviour is generally considered untypical of polar bears. During the following ice-free summer and autumn, at least seven different white-beaked dolphin carcasses were observed in or near the same area. We suggest, based on the area and the degree to which these dolphins had decayed, that they were likely from the same pod and also suffered death due to entrapment in the ice in April. At least six different polar bears were seen scavenging on the carcasses.

  10. Acute gastric dilatation and volvulus in a free-living polar bear

    Science.gov (United States)

    Amstrup, Steven C.; Nielsen, Carol A.

    1989-01-01

    A large, adult male polar bear (Ursus maritimus) was found dead on a barrier island north of Prudhoe Bay, Alaska (USA), in June 1987. There were no external signs of trauma. A twisted distended stomach, distinctive parenchymal and fascial congestion, and significant difficulty in repositioning the anterior abdominal organs, indicated that gastric dilatation-volvulus (GDV) was the proximate cause of death. Polar bears frequently consume large quantities of food at one time and have large stomachs that are well adapted to periodic gorging. The scarcity of food in winter and early spring, combined with voluntary fasting and protracted vigorous activity during the breeding season in late spring may have predisposed this bear to GDV. The relationship between GDV and postprandial exercise emphasizes the need for a better understanding of how the present human invasion of arctic habitats may influence polar bear activities.

  11. Temporal Trends and Future Predictions of Mercury Concentrations in Northwest Greenland Polar Bear (Ursus maritimus) Hair

    DEFF Research Database (Denmark)

    Dietz, Rune; Born, E.W.; Riget, Frank Farsø

    2011-01-01

    Hair samples from 117 Northwest Greenland polar bears (Ursus maritimus) were taken during 1892-2008 and analyzed for total mercury (hereafterHg). The sample represented 28 independent years and the aim of the study was to analyze for temporal Hg trends. Mercury concentrations showed yearly...... significant increases of 1.6-1.7% (p bear......-2008 concentrations ofHg in Northwest Greenland polar bear hair exceeded the general guideline values of 20-30 μg/g dry weight for terrestrial wildlife, whereas the neurochemical effect level of 5.4 μg Hg/g dry weight proposed for East Greenland polar bears was exceeded in 93.5% of the cases. These results call...

  12. Age and sex composition of seals killed by polar bears in the eastern Beaufort Sea.

    Directory of Open Access Journals (Sweden)

    Nicholas W Pilfold

    Full Text Available BACKGROUND: Polar bears (Ursus maritimus of the Beaufort Sea enter hyperphagia in spring and gain fat reserves to survive periods of low prey availability. We collected information on seals killed by polar bears (n=650 and hunting attempts on ringed seal (Pusa hispida lairs (n=1396 observed from a helicopter during polar bear mark-recapture studies in the eastern Beaufort Sea in spring in 1985-2011. We investigated how temporal shifts in ringed seal reproduction affect kill composition and the intraspecific vulnerabilities of ringed seals to polar bear predation. PRINCIPAL FINDINGS: Polar bears primarily preyed on ringed seals (90.2% while bearded seals (Erignathus barbatus only comprised 9.8% of the kills, but 33% of the biomass. Adults comprised 43.6% (150/344 of the ringed seals killed, while their pups comprised 38.4% (132/344. Juvenile ringed seals were killed at the lowest proportion, comprising 18.0% (62/344 of the ringed seal kills. The proportion of ringed seal pups was highest between 2007-2011, in association with high ringed seal productivity. Half of the adult ringed seal kills were ≥ 21 years (60/121, and kill rates of adults increased following the peak of parturition. Determination of sex from DNA revealed that polar bears killed adult male and adult female ringed seals equally (0.50, n=78. The number of hunting attempts at ringed seal subnivean lair sites was positively correlated with the number of pup kills (r(2 =0.30, P=0.04, but was not correlated with the number of adult kills (P=0.37. CONCLUSIONS/SIGNIFICANCE: Results are consistent with decadal trends in ringed seal productivity, with low numbers of pups killed by polar bears in spring in years of low pup productivity, and conversely when pup productivity was high. Vulnerability of adult ringed seals to predation increased in relation to reproductive activities and age, but not gender.

  13. Population ecology of polar bears in Davis Strait, Canada and Greenland

    Science.gov (United States)

    Peacock, Elizabeth; Taylor, Mitchell K.; Laake, Jeffrey L.; Stirling, Ian

    2013-01-01

    Until recently, the sea ice habitat of polar bears was understood to be variable, but environmental variability was considered to be cyclic or random, rather than progressive. Harvested populations were believed to be at levels where density effects were considered not significant. However, because we now understand that polar bear demography can also be influenced by progressive change in the environment, and some populations have increased to greater densities than historically lower numbers, a broader suite of factors should be considered in demographic studies and management. We analyzed 35 years of capture and harvest data from the polar bear (Ursus maritimus) subpopulation in Davis Strait, including data from a new study (2005–2007), to quantify its current demography. We estimated the population size in 2007 to be 2,158 ± 180 (SE), a likely increase from the 1970s. We detected variation in survival, reproductive rates, and age-structure of polar bears from geographic sub-regions. Survival and reproduction of bears in southern Davis Strait was greater than in the north and tied to a concurrent dramatic increase in breeding harp seals (Pagophilus groenlandicus) in Labrador. The most supported survival models contained geographic and temporal variables. Harp seal abundance was significantly related to polar bear survival. Our estimates of declining harvest recovery rate, and increasing total survival, suggest that the rate of harvest declined over time. Low recruitment rates, average adult survival rates, and high population density, in an environment of high prey density, but deteriorating and variable ice conditions, currently characterize the Davis Strait polar bears. Low reproductive rates may reflect negative effects of greater densities or worsening ice conditions.

  14. Field metabolic rate and PCB adipose tissue deposition efficiency in East Greenland polar bears derived from contaminant monitoring data.

    Science.gov (United States)

    Pavlova, Viola; Nabe-Nielsen, Jacob; Dietz, Rune; Svenning, Jens-Christian; Vorkamp, Katrin; Rigét, Frank Farsø; Sonne, Christian; Letcher, Robert J; Grimm, Volker

    2014-01-01

    Climate change will increasingly affect the natural habitat and diet of polar bears (Ursus maritimus). Understanding the energetic needs of polar bears is therefore important. We developed a theoretical method for estimating polar bear food consumption based on using the highly recalcitrant polychlorinated biphenyl (PCB) congener, 2,2',4,4',55-hexaCB (CB153) in bear adipose tissue as an indicator of food intake. By comparing the CB153 tissue concentrations in wild polar bears with estimates from a purposely designed individual-based model, we identified the possible combinations of field metabolic rates (FMR) and CB153 deposition efficiencies in East Greenland polar bears. Our simulations indicate that if 30% of the CB153 consumed by polar bear individuals were deposited into their adipose tissue, the corresponding FMR would be only two times the basal metabolic rate. In contrast, if the modelled CB153 deposition efficiency were 10%, adult polar bears would require six times more energy than that needed to cover basal metabolism. This is considerably higher than what has been assumed for polar bears in previous studies though it is similar to FMRs found in other marine mammals. An implication of this result is that even relatively small reductions in future feeding opportunities could impact the survival of East Greenland polar bears.

  15. Field metabolic rate and PCB adipose tissue deposition efficiency in East Greenland polar bears derived from contaminant monitoring data.

    Directory of Open Access Journals (Sweden)

    Viola Pavlova

    Full Text Available Climate change will increasingly affect the natural habitat and diet of polar bears (Ursus maritimus. Understanding the energetic needs of polar bears is therefore important. We developed a theoretical method for estimating polar bear food consumption based on using the highly recalcitrant polychlorinated biphenyl (PCB congener, 2,2',4,4',55-hexaCB (CB153 in bear adipose tissue as an indicator of food intake. By comparing the CB153 tissue concentrations in wild polar bears with estimates from a purposely designed individual-based model, we identified the possible combinations of field metabolic rates (FMR and CB153 deposition efficiencies in East Greenland polar bears. Our simulations indicate that if 30% of the CB153 consumed by polar bear individuals were deposited into their adipose tissue, the corresponding FMR would be only two times the basal metabolic rate. In contrast, if the modelled CB153 deposition efficiency were 10%, adult polar bears would require six times more energy than that needed to cover basal metabolism. This is considerably higher than what has been assumed for polar bears in previous studies though it is similar to FMRs found in other marine mammals. An implication of this result is that even relatively small reductions in future feeding opportunities could impact the survival of East Greenland polar bears.

  16. Invariant polar bear habitat selection during a period of sea ice loss.

    Science.gov (United States)

    Wilson, Ryan R; Regehr, Eric V; Rode, Karyn D; St Martin, Michelle

    2016-08-17

    Climate change is expected to alter many species' habitat. A species' ability to adjust to these changes is partially determined by their ability to adjust habitat selection preferences to new environmental conditions. Sea ice loss has forced polar bears (Ursus maritimus) to spend longer periods annually over less productive waters, which may be a primary driver of population declines. A negative population response to greater time spent over less productive water implies, however, that prey are not also shifting their space use in response to sea ice loss. We show that polar bear habitat selection in the Chukchi Sea has not changed between periods before and after significant sea ice loss, leading to a 75% reduction of highly selected habitat in summer. Summer was the only period with loss of highly selected habitat, supporting the contention that summer will be a critical period for polar bears as sea ice loss continues. Our results indicate that bears are either unable to shift selection patterns to reflect new prey use patterns or that there has not been a shift towards polar basin waters becoming more productive for prey. Continued sea ice loss is likely to further reduce habitat with population-level consequences for polar bears.

  17. Conservation status of polar bears (Ursus maritimus) in relation to projected sea-ice declines

    Science.gov (United States)

    Akçakaya, H. Resit; Amstrup, Steven C.; Atwood, Todd C.; Lunn, Nicholas J.; Obbard, Martyn; Stern, Harry; Thiemann, Gregory W.; Wiig, Øystein

    2016-01-01

    Loss of Arctic sea ice owing to climate change is the primary threat to polar bears throughout their range. We evaluated the potential response of polar bears to sea-ice declines by (i) calculating generation length (GL) for the species, which determines the timeframe for conservation assessments; (ii) developing a standardized sea-ice metric representing important habitat; and (iii) using statistical models and computer simulation to project changes in the global population under three approaches relating polar bear abundance to sea ice. Mean GL was 11.5 years. Ice-covered days declined in all subpopulation areas during 1979–2014 (median −1.26 days year−1). The estimated probabilities that reductions in the mean global population size of polar bears will be greater than 30%, 50% and 80% over three generations (35–41 years) were 0.71 (range 0.20–0.95), 0.07 (range 0–0.35) and less than 0.01 (range 0–0.02), respectively. According to IUCN Red List reduction thresholds, which provide a common measure of extinction risk across taxa, these results are consistent with listing the species as vulnerable. Our findings support the potential for large declines in polar bear numbers owing to sea-ice loss, and highlight near-term uncertainty in statistical projections as well as the sensitivity of projections to different plausible assumptions. PMID:27928000

  18. Conservation status of polar bears (Ursus maritimus) in relation to projected sea-ice declines.

    Science.gov (United States)

    Regehr, Eric V; Laidre, Kristin L; Akçakaya, H Resit; Amstrup, Steven C; Atwood, Todd C; Lunn, Nicholas J; Obbard, Martyn; Stern, Harry; Thiemann, Gregory W; Wiig, Øystein

    2016-12-01

    Loss of Arctic sea ice owing to climate change is the primary threat to polar bears throughout their range. We evaluated the potential response of polar bears to sea-ice declines by (i) calculating generation length (GL) for the species, which determines the timeframe for conservation assessments; (ii) developing a standardized sea-ice metric representing important habitat; and (iii) using statistical models and computer simulation to project changes in the global population under three approaches relating polar bear abundance to sea ice. Mean GL was 11.5 years. Ice-covered days declined in all subpopulation areas during 1979-2014 (median -1.26 days year(-1)). The estimated probabilities that reductions in the mean global population size of polar bears will be greater than 30%, 50% and 80% over three generations (35-41 years) were 0.71 (range 0.20-0.95), 0.07 (range 0-0.35) and less than 0.01 (range 0-0.02), respectively. According to IUCN Red List reduction thresholds, which provide a common measure of extinction risk across taxa, these results are consistent with listing the species as vulnerable. Our findings support the potential for large declines in polar bear numbers owing to sea-ice loss, and highlight near-term uncertainty in statistical projections as well as the sensitivity of projections to different plausible assumptions.

  19. Anthropogenic flank attack on polar bears: Interacting consequences of climate warming and pollutant exposure

    Directory of Open Access Journals (Sweden)

    Bjørn Munro Jenssen

    2015-02-01

    Full Text Available Polar bears (Ursus maritimus are subjected to several anthropogenic threats, climate warming and exposure to pollutants being two of these. For polar bears, one of the main effects of climate warming is limited access to prey, due to loss of their sea ice habitat. This will result in prolonged fasting periods and emaciation and condition related negative effects on survival and reproduction success. Prolonged fasting will result in increases of the tissue concentrations of persistent organic pollutants (POPs in polar bears, and thus increase the probability for POP levels to exceed threshold levels for effects on health, and thus on reproductive success and survival. There are clear potentials for interactions between impacts of climate warming and impacts of pollutant exposure on polar bears. It is likely that that fasting-induced increases of POPs will add to mortality rates and decrease reproductive success beyond effects caused by loss of habitat alone. However, there is a lack of studies that have addressed this. Thus, there is a need to focus on population effects of POP exposure in polar bears, and to consider such effects in relation to the effects of climate induced habitat loss.

  20. Survival and breeding of polar bears in the southern Beaufort Sea in relation to sea ice

    Science.gov (United States)

    Regehr, E.V.; Hunter, C.M.; Caswell, H.; Amstrup, Steven C.; Stirling, I.

    2010-01-01

    1. Observed and predicted declines in Arctic sea ice have raised concerns about marine mammals. In May 2008, the US Fish and Wildlife Service listed polar bears (Ursus maritimus) - one of the most ice-dependent marine mammals - as threatened under the US Endangered Species Act. 2. We evaluated the effects of sea ice conditions on vital rates (survival and breeding probabilities) for polar bears in the southern Beaufort Sea. Although sea ice declines in this and other regions of the polar basin have been among the greatest in the Arctic, to date population-level effects of sea ice loss on polar bears have only been identified in western Hudson Bay, near the southern limit of the species' range. 3. We estimated vital rates using multistate capture-recapture models that classified individuals by sex, age and reproductive category. We used multimodel inference to evaluate a range of statistical models, all of which were structurally based on the polar bear life cycle. We estimated parameters by model averaging, and developed a parametric bootstrap procedure to quantify parameter uncertainty. 4. In the most supported models, polar bear survival declined with an increasing number of days per year that waters over the continental shelf were ice free. In 2001-2003, the ice-free period was relatively short (mean 101 days) and adult female survival was high (0 ∙ 96-0 ∙ 99, depending on reproductive state). In 2004 and 2005, the ice-free period was longer (mean 135 days) and adult female survival was low (0 ∙ 73-0 ∙ 79, depending on reproductive state). Breeding rates and cub litter survival also declined with increasing duration of the ice-free period. Confidence intervals on vital rate estimates were wide. 5. The effects of sea ice loss on polar bears in the southern Beaufort Sea may apply to polar bear populations in other portions of the polar basin that have similar sea ice dynamics and have experienced similar, or more severe, sea ice declines. Our findings

  1. Polar and brown bear genomes reveal ancient admixture and demographic footprints of past climate change

    Science.gov (United States)

    Miller, Webb; Schuster, Stephan C.; Welch, Andreanna J.; Ratan, Aakrosh; Bedoya-Reina, Oscar C.; Zhao, Fangqing; Kim, Hie Lim; Burhans, Richard C.; Drautz, Daniela I.; Wittekindt, Nicola E.; Tomsho, Lynn P.; Ibarra-Laclette, Enrique; Herrera-Estrella, Luis; Peacock, Elizabeth; Farley, Sean; Sage, George K.; Rode, Karyn; Obbard, Martyn E.; Montiel, Rafael; Bachmann, Lutz; Ingólfsson, Ólafur; Aars, Jon; Mailund, Thomas; Wiig, Øystein; Talbot, Sandra L.; Lindqvist, Charlotte

    2012-01-01

    Polar bears (PBs) are superbly adapted to the extreme Arctic environment and have become emblematic of the threat to biodiversity from global climate change. Their divergence from the lower-latitude brown bear provides a textbook example of rapid evolution of distinct phenotypes. However, limited mitochondrial and nuclear DNA evidence conflicts in the timing of PB origin as well as placement of the species within versus sister to the brown bear lineage. We gathered extensive genomic sequence data from contemporary polar, brown, and American black bear samples, in addition to a 130,000- to 110,000-y old PB, to examine this problem from a genome-wide perspective. Nuclear DNA markers reflect a species tree consistent with expectation, showing polar and brown bears to be sister species. However, for the enigmatic brown bears native to Alaska's Alexander Archipelago, we estimate that not only their mitochondrial genome, but also 5–10% of their nuclear genome, is most closely related to PBs, indicating ancient admixture between the two species. Explicit admixture analyses are consistent with ancient splits among PBs, brown bears and black bears that were later followed by occasional admixture. We also provide paleodemographic estimates that suggest bear evolution has tracked key climate events, and that PB in particular experienced a prolonged and dramatic decline in its effective population size during the last ca. 500,000 years. We demonstrate that brown bears and PBs have had sufficiently independent evolutionary histories over the last 4–5 million years to leave imprints in the PB nuclear genome that likely are associated with ecological adaptation to the Arctic environment.

  2. Movements of female polar bears (Usrus maritimus) in the East Greenland pack ice

    DEFF Research Database (Denmark)

    Wiig, Øystein; Born, Erik W.; Pedersen, Leif Toudal

    2003-01-01

    The movements of two adult female polar bears (Ursus maritimus) in East Greenland and the Greenland Sea area were studied by use of satellite telemetry between the fall of 1994 and the summer of 1998. One female was tracked for 621 days, the other for 1,415 days. During this time the females used...... for a closer monitoring of the effects of this change on the East Greenland polar bear population....... movement rates varied between 0.32 and 0.76km/h. Both bears had very large home ranges (242,000 and 468,000 km(2)) within the dynamic pack ice of the Greenland Sea. The facts that the bears made extensive use of the offshore sea ice and that there is a marked reduction of the Greenland Sea ice call...

  3. Polar bear and walrus response to the rapid decline in Arctic sea ice

    Science.gov (United States)

    Oakley, K.; Whalen, M.; Douglas, D.; Udevitz, M.; Atwood, T.; Jay, C.

    2012-01-01

    The Arctic is warming faster than other regions of the world due to positive climate feedbacks associated with loss of snow and ice. One highly visible consequence has been a rapid decline in Arctic sea ice over the past 3 decades - a decline projected to continue and result in ice-free summers likely as soon as 2030. The polar bear (Ursus maritimus) and the Pacific walrus (Odobenus rosmarus divergens) are dependent on sea ice over the continental shelves of the Arctic Ocean's marginal seas. The continental shelves are shallow regions with high biological productivity, supporting abundant marine life within the water column and on the sea floor. Polar bears use sea ice as a platform for hunting ice seals; walruses use sea ice as a resting platform between dives to forage for clams and other bottom-dwelling invertebrates. How have sea ice changes affected polar bears and walruses? How will anticipated changes affect them in the future?

  4. Polar bears (Ursus maritimus mating during late June on the pack ice of northern Svalbard, Norway

    Directory of Open Access Journals (Sweden)

    Thomas G. Smith

    2015-03-01

    Full Text Available Polar bears are seasonal breeders and typically mate from late March to early May. Implantation is, however, delayed until autumn, which can allow plasticity in the date of mating. As for other seasonal breeders, a rapid return to estrus after the loss of dependent offspring can be expected, even into the summer. A few earlier observations and dissections of dead animals suggest that polar bears are able to mate in summer. We report on a mating incident on 29 June 2014, the first documented mating this late in the season among wild polar bears. The female had lost her dependent cub during the period prior to the mating event. We speculate that she lost this cub late in the mating season, entered estrus and successfully mated in late June.

  5. Size and density of East Greenland polar bear (Ursus maritimus) skulls

    DEFF Research Database (Denmark)

    Sonne, C.; Bechshøft, T.O.; Rigét, F.F.

    2013-01-01

    density (BMD) in 87 East Greenland male polar bears (Ursus maritimus) sampled in the time period of 1892-2010. The purpose of the study was to investigate if these measures are potential candidates as indicators for stress associated with climate change and long-range transported toxic industrial...... chemicals. The analyses showed that both BMD and CBL in polar bears sampled in period 4 (1999-2010, n = 57) were significantly lower when compared with period 2 (1920-1936, n = 19) (both p ... that BMD and body size have decreased in East Greenland polar bear males over the past 120 years and that exposure to organohalogen contaminants may explain the BMD reductions. It is, however, not entirely clear if and how climatic oscillations affected the reductions in body size and BMD mainly because...

  6. Hydroxylated polychlorinated biphenyls decrease circulating steroids in female polar bears (Ursus maritimus)

    DEFF Research Database (Denmark)

    Gustavson, Lisa; Ciesielski, Tomasz M; Bytingsvik, Jenny;

    2015-01-01

    As a top predator in the Arctic food chain, polar bears (Ursus maritimus) are exposed to high levels of persistent organic pollutants (POPs). Because several of these compounds have been reported to alter endocrine pathways, such as the steroidogenesis, potential disruption of the sex steroid...... synthesis by POPs may cause implications for reproduction by interfering with ovulation, implantation and fertility. Blood samples were collected from 15 female polar bears in Svalbard (Norway) in April 2008. The concentrations of nine circulating steroid hormones; dehydroepiandrosterone (DHEA......-metabolites (hydroxylated PCBs [OH-PCBs] and hydroxylated PBDEs [OH-PBDEs]), steroid hormones, biological and capture variables in female polar bears. Inverse correlations were found between circulating levels of PRE and AN, and circulating levels of OH-PCBs. There were no significant relationships between the steroid...

  7. Greenhouse gas mitigation can reduce sea-ice loss and increase polar bear persistence.

    Science.gov (United States)

    Amstrup, Steven C; Deweaver, Eric T; Douglas, David C; Marcot, Bruce G; Durner, George M; Bitz, Cecilia M; Bailey, David A

    2010-12-16

    On the basis of projected losses of their essential sea-ice habitats, a United States Geological Survey research team concluded in 2007 that two-thirds of the world's polar bears (Ursus maritimus) could disappear by mid-century if business-as-usual greenhouse gas emissions continue. That projection, however, did not consider the possible benefits of greenhouse gas mitigation. A key question is whether temperature increases lead to proportional losses of sea-ice habitat, or whether sea-ice cover crosses a tipping point and irreversibly collapses when temperature reaches a critical threshold. Such a tipping point would mean future greenhouse gas mitigation would confer no conservation benefits to polar bears. Here we show, using a general circulation model, that substantially more sea-ice habitat would be retained if greenhouse gas rise is mitigated. We also show, with Bayesian network model outcomes, that increased habitat retention under greenhouse gas mitigation means that polar bears could persist throughout the century in greater numbers and more areas than in the business-as-usual case. Our general circulation model outcomes did not reveal thresholds leading to irreversible loss of ice; instead, a linear relationship between global mean surface air temperature and sea-ice habitat substantiated the hypothesis that sea-ice thermodynamics can overcome albedo feedbacks proposed to cause sea-ice tipping points. Our outcomes indicate that rapid summer ice losses in models and observations represent increased volatility of a thinning sea-ice cover, rather than tipping-point behaviour. Mitigation-driven Bayesian network outcomes show that previously predicted declines in polar bear distribution and numbers are not unavoidable. Because polar bears are sentinels of the Arctic marine ecosystem and trends in their sea-ice habitats foreshadow future global changes, mitigating greenhouse gas emissions to improve polar bear status would have conservation benefits throughout

  8. Greenhouse gas mitigation can reduce sea-ice loss and increase polar bear persistence

    Science.gov (United States)

    Amstrup, Steven C.; Deweaver, E.T.; Douglas, D.C.; Marcot, B.G.; Durner, G.M.; Bitz, C.M.; Bailey, D.A.

    2010-01-01

    On the basis of projected losses of their essential sea-ice habitats, a United States Geological Survey research team concluded in 2007 that two-thirds of the worlds polar bears (Ursus maritimus) could disappear by mid-century if business-as-usual greenhouse gas emissions continue. That projection, however, did not consider the possible benefits of greenhouse gas mitigation. A key question is whether temperature increases lead to proportional losses of sea-ice habitat, or whether sea-ice cover crosses a tipping point and irreversibly collapses when temperature reaches a critical threshold. Such a tipping point would mean future greenhouse gas mitigation would confer no conservation benefits to polar bears. Here we show, using a general circulation model, that substantially more sea-ice habitat would be retained if greenhouse gas rise is mitigated. We also show, with Bayesian network model outcomes, that increased habitat retention under greenhouse gas mitigation means that polar bears could persist throughout the century in greater numbers and more areas than in the business-as-usual case. Our general circulation model outcomes did not reveal thresholds leading to irreversible loss of ice; instead, a linear relationship between global mean surface air temperature and sea-ice habitat substantiated the hypothesis that sea-ice thermodynamics can overcome albedo feedbacks proposed to cause sea-ice tipping points. Our outcomes indicate that rapid summer ice losses in models and observations represent increased volatility of a thinning sea-ice cover, rather than tipping-point behaviour. Mitigation-driven Bayesian network outcomes show that previously predicted declines in polar bear distribution and numbers are not unavoidable. Because polar bears are sentinels of the Arctic marine ecosystem and trends in their sea-ice habitats foreshadow future global changes, mitigating greenhouse gas emissions to improve polar bear status would have conservation benefits throughout

  9. Comparative analysis of fecal microbiota and intestinal microbial metabolic activity in captive polar bears.

    Science.gov (United States)

    Schwab, Clarissa; Gänzle, Michael

    2011-03-01

    The composition of the intestinal microbiota depends on gut physiology and diet. Ursidae possess a simple gastrointestinal system composed of a stomach, small intestine, and indistinct hindgut. This study determined the composition and stability of fecal microbiota of 3 captive polar bears by group-specific quantitative PCR and PCR-DGGE (denaturing gradient gel electrophoresis) using the 16S rRNA gene as target. Intestinal metabolic activity was determined by analysis of short-chain fatty acids in feces. For comparison, other Carnivora and mammals were included in this study. Total bacterial abundance was approximately log 8.5 DNA gene copies·(g feces)-1 in all 3 polar bears. Fecal polar bear microbiota was dominated by the facultative anaerobes Enterobacteriaceae and enterococci, and the Clostridium cluster I. The detection of the Clostridium perfringens α-toxin gene verified the presence of C. perfringens. Composition of the fecal bacterial population was stable on a genus level; according to results obtained by PCR-DGGE, dominant bacterial species fluctuated. The total short-chain fatty acid content of Carnivora and other mammals analysed was comparable; lactate was detected in feces of all carnivora but present only in trace amounts in other mammals. In comparison, the fecal microbiota and metabolic activity of captive polar bears mostly resembled the closely related grizzly and black bears.

  10. An Evolutionarily Young Polar Bear (Ursus maritimus Endogenous Retrovirus Identified from Next Generation Sequence Data

    Directory of Open Access Journals (Sweden)

    Kyriakos Tsangaras

    2015-11-01

    Full Text Available Transcriptome analysis of polar bear (Ursus maritimus tissues identified sequences with similarity to Porcine Endogenous Retroviruses (PERV. Based on these sequences, four proviral copies and 15 solo long terminal repeats (LTRs of a newly described endogenous retrovirus were characterized from the polar bear draft genome sequence. Closely related sequences were identified by PCR analysis of brown bear (Ursus arctos and black bear (Ursus americanus but were absent in non-Ursinae bear species. The virus was therefore designated UrsusERV. Two distinct groups of LTRs were observed including a recombinant ERV that contained one LTR belonging to each group indicating that genomic invasions by at least two UrsusERV variants have recently occurred. Age estimates based on proviral LTR divergence and conservation of integration sites among ursids suggest the viral group is only a few million years old. The youngest provirus was polar bear specific, had intact open reading frames (ORFs and could potentially encode functional proteins. Phylogenetic analyses of UrsusERV consensus protein sequences suggest that it is part of a pig, gibbon and koala retrovirus clade. The young age estimates and lineage specificity of the virus suggests UrsusERV is a recent cross species transmission from an unknown reservoir and places the viral group among the youngest of ERVs identified in mammals.

  11. Resilience and risk: a demographic model to inform conservation planning for polar bears

    Science.gov (United States)

    Regehr, Eric V.; Wilson, Ryan R.; Rode, Karyn D.; Runge, Michael C.

    2015-01-01

    Climate change is having widespread ecological effects, including loss of Arctic sea ice. This has led to listing of the polar bear (Ursus maritimus) and other ice-dependent marine mammals under the U.S. Endangered Species Act (ESA). Methods are needed to evaluate the effects of climate change on population persistence to inform recovery planning for listed species. For polar bears, this includes understanding interactions between climate and secondary factors, such as subsistence harvest, which provide economic, nutritional, or cultural value to humans.

  12. Relationships between POPs, biometrics and circulating steroids in male polar bears (Ursus maritimus) from Svalbard

    DEFF Research Database (Denmark)

    Ciesielski, Tomasz M.; Hansen, Ingunn Tjelta; Bytingsvik, Jenny

    2017-01-01

    ), progesterone (PRO), androstenedione (AN), dehydroepiandrosterone (DHEA), testosterone (TS), dihydrotestosterone (DHT), estrone (E1), 17α-estradiol (αE2) and 17β-estradiol (βE2) were quantified in polar bear serum by gas chromatography tandem mass spectrometry (GC-MS/MS), while POPs were measured in plasma....../estrogen ratios being approximately 60 times higher in adult males than in subadult males. PCA plots and OPLS models indicated that TS was positively related to biometrics, such as body condition index in male polar bears. A negative relationship was also observed between POPs and DHT. Consequently, POPs and body...

  13. A novel endogenous betaretrovirus group characterized from polar bears (Ursus maritimus) and giant pandas (Ailuropoda melanoleuca)

    DEFF Research Database (Denmark)

    Mayer, Jens; Tsangaras, Kyriakos; Heeger, Felix;

    2013-01-01

    . Molecular dating indicates the group originated before the divergence of bears from a common ancestor but is not present in all carnivores. Closely related sequences were identified in the giant panda (Ailuropoda melanoleuca) and characterized from its genome. We have designated the polar bear and giant...... panda sequences U. maritimus endogenous retrovirus (UmaERV) and A. melanoleuca endogenous retrovirus (AmeERV), respectively. Phylogenetic analysis demonstrated that the bear virus group is nested within the HERV-K supergroup among bovine and bat endogenous retroviruses suggesting a complex evolutionary...

  14. Ethylene glycol (antifreeze) poisoning in a free-ranging polar bear

    Science.gov (United States)

    Amstrup, Steven C.; Gardner, Craig L.; Myers, Kevin C.; Oehme, Frederick W.

    1989-01-01

    The bright, fluorescent pink-colored remains of a polar bear were found on an Alaskan island with the gravel and snow adjacent to the bear colored bright purple. Traces of fox urine and feces found nearby were also pink. The punk and purple colors were due to rhodamine B, and ethylene glycol (EG) was present in the soil under the carcass. Evidence is given to suggest the bear consumed a mixture of rhodamine B and EG commonly used to mark roads and runways during snow and ice periods. Such wildlife losses could be prevented by substituting propylene glycol for the EG in such mixtures.

  15. Evaluating and ranking threats to the long-term persistence of polar bears

    Science.gov (United States)

    Atwood, Todd C.; Marcot, Bruce G.; Douglas, David C.; Amstrup, Steven C.; Rode, Karyn D.; Durner, George M.; Bromaghin, Jeffrey F.

    2015-01-01

    The polar bear (Ursus maritimus) was listed as a globally threatened species under the U.S. Endangered Species Act (ESA) in 2008, mostly due to the significant threat to their future population viability from rapidly declining Arctic sea ice. A core mandate of the ESA is the development of a recovery plan that identifies steps to maintain viable populations of a listed species. A substantive evaluation of the relative influence of putative threats to population persistence is helpful to recovery planning. Because management actions must often be taken in the face of substantial information gaps, a formalized evaluation hypothesizing potential stressors and their relationships with population persistence can improve identification of relevant conservation actions. To this end, we updated a Bayesian network model previously used to forecast the future status of polar bears worldwide. We used new information on actual and predicted sea ice loss and polar bear responses to evaluate the relative influence of plausible threats and their mitigation through management actions on the persistence of polar bears in four ecoregions. We found that polar bear outcomes worsened over time through the end of the century under both stabilized and unabated greenhouse gas (GHG) emission pathways. Under the unabated pathway (i.e., RCP 8.5), the time it took for polar bear populations in two of four ecoregions to reach a dominant probability of greatly decreased was hastened by about 25 years. Under the stabilized GHG emission pathway (i.e., RCP 4.5), where GHG emissions peak around the year 2040, the polar bear population in the Archipelago Ecoregion of High Arctic Canada never reached a dominant probability of greatly decreased, reinforcing earlier suggestions of this ecoregion’s potential to serve as a long-term refugium. The most influential drivers of adverse polar bear outcomes were declines to overall sea ice conditions and to the marine prey base. Improved sea ice conditions

  16. Demography and behavior of polar bears summering on land in Alaska

    Science.gov (United States)

    Peacock, Lily

    2014-01-01

    Polar bears (Ursus maritimus) in the southern Beaufort Sea population (SB) are spending increased time on the coastal North Slope of Alaska between July and October (Gleason and Rode 2010). The duration spent on land by polar bears, satellite collared on the sea-ice in the spring, during the summer and fall has also increased (USGS, unpublished data; Figure 1). This change in polar bear ecology has relevance for human-bear interactions, subsistence harvest, prevalence of defense kills, and disturbance associated with existing land-based development [e.g., National Petroleum Reserve of Alaska (NPRA), Arctic National Wildlife Refuge (ANWR)], Native Alaskan communities, recreation (ANWR) and tourism (e.g., bear viewing in Kaktovik, AK). These activities have the potential to impact, in new ways, the status of the entire SB population. Concomitantly, the change in polar bear ecology will impact these human activities, and a base-line characterization of this phenomenon can better inform mitigation (e.g., industry permitting under the Endangered Species Act and Marine Mammal Protection Act). In this study we aim to characterize the demography, habitat-use, and aspects of foraging ecology and health of polar bears spending fall on land. The SB population is characterized by a divergent-sea ice ecology, where polar bears typically spend most of the year on the sea-ice, even as the pack ice retreats northward, away from the coast, to its minimal extent in September (Amstrup et al. 2008; Durner et al. 2009). From 2000 – 2005, using coastal aerial surveys, Schliebe et al. (2008) observed between 3.7 and 8% of polar bears from SB (~ 60 – 120 of 1526, Regher et al. 2006) on land during the autumn. Sighting probability was not estimated in these surveys, and therefore the numbers represent minimum numbers of bears on land. Our analysis of USGS data suggest an annual average of 15% (± 3%, SE) of polar bears satellite-tagged on the spring-time sea ice (total n = 18 of 124

  17. A tale of two polar bear populations: Ice habitat, harvest, and body condition

    Science.gov (United States)

    Rode, K.D.; Peacock, E.; Taylor, M.; Stirling, I.; Born, E.W.; Laidre, K.L.; Wiig, O.

    2012-01-01

    One of the primary mechanisms by which sea ice loss is expected to affect polar bears is via reduced body condition and growth resulting from reduced access to prey. To date, negative effects of sea ice loss have been documented for two of 19 recognized populations. Effects of sea ice loss on other polar bear populations that differ in harvest rate, population density, and/or feeding ecology have been assumed, but empirical support, especially quantitative data on population size, demography, and/or body condition spanning two or more decades, have been lacking. We examined trends in body condition metrics of captured bears and relationships with summertime ice concentration between 1977 and 2010 for the Baffin Bay (BB) and Davis Strait (DS) polar bear populations. Polar bears in these regions occupy areas with annual sea ice that has decreased markedly starting in the 1990s. Despite differences in harvest rate, population density, sea ice concentration, and prey base, polar bears in both populations exhibited positive relationships between body condition and summertime sea ice cover during the recent period of sea ice decline. Furthermore, females and cubs exhibited relationships with sea ice that were not apparent during the earlier period (1977-1990s) when sea ice loss did not occur. We suggest that declining body condition in BB may be a result of recent declines in sea ice habitat. In DS, high population density and/or sea ice loss, may be responsible for the declines in body condition. ?? 2011 The Society of Population Ecology and Springer.

  18. Xenoendocrine pollutants May Reduce Size of Sexual Organs in East Greenland Polar Bears (Ursus Maritimus)

    DEFF Research Database (Denmark)

    Sonne, Christian; Leifsson, Pall S.; Dietz, Rune

    2006-01-01

    Reproductive organs from 55 male and 44 female East Greenland polar bears were examined to investigate the potential negative impact from organohalogen pollutants (OHCs). Multiple regressions normalizing for age showed a significant inverse relationship between OHCs and testis length and baculum ...

  19. Experiencing polar bears in the zoo: feelings and cognitions in relation to a visitor's conservation attitude

    NARCIS (Netherlands)

    Marseille, M.M.; Elands, B.H.M.; Brink, van den M.L.

    2012-01-01

    This article explores which feelings and cognitions are involved in visitor experiences of zoo polar bears and how this experience relates to a visitor's conservation attitude. Data were collected through qualitative interviews with 30 visitors in two Dutch zoos. Most respondents believed that a

  20. Polar Bear UV Imaging of Airglow and Aurora - Image Processing and Results

    Science.gov (United States)

    1989-09-24

    in time) over the first half year of Polar BEAR’s life in 12 orbit by plotting a few dosen panes randomly chosen from that era. Figure 5 shows the...intend to expand our processing in the future to include dosens of images in each map. Thus this point, at least regarding the statistical validity of

  1. Experiencing polar bears in the zoo: feelings and cognitions in relation to a visitor's conservation attitude

    NARCIS (Netherlands)

    Marseille, M.M.; Elands, B.H.M.; Brink, van den M.L.

    2012-01-01

    This article explores which feelings and cognitions are involved in visitor experiences of zoo polar bears and how this experience relates to a visitor's conservation attitude. Data were collected through qualitative interviews with 30 visitors in two Dutch zoos. Most respondents believed that a pol

  2. Experiencing polar bears in the zoo: feelings and cognitions in relation to a visitor's conservation attitude

    NARCIS (Netherlands)

    Marseille, M.M.; Elands, B.H.M.; Brink, van den M.L.

    2012-01-01

    This article explores which feelings and cognitions are involved in visitor experiences of zoo polar bears and how this experience relates to a visitor's conservation attitude. Data were collected through qualitative interviews with 30 visitors in two Dutch zoos. Most respondents believed that a pol

  3. Forecasting the relative influence of environmental and anthropogenic stressors on polar bears

    Science.gov (United States)

    Todd C. Atwood; Bruce G. Marcot; David C. Douglas; Steven C. Amstrup; Karyn D. Rode; George M. Durner; Jeffrey F. Bromaghin

    2016-01-01

    Effective conservation planning requires understanding and ranking threats to wildlife populations. We developed a Bayesian network model to evaluate the relative influence of environmental and anthropogenic stressors, and their mitigation, on the persistence of polar bears (Ursus maritimus). Overall sea ice conditions, affected by rising global...

  4. Polar bears in the Beaufort Sea: A 30-year mark-recapture case history

    Science.gov (United States)

    Amstrup, Steven C.; McDonald, T.L.; Stirling, I.

    2001-01-01

    Knowledge of population size and trend is necessary to manage anthropogenic risks to polar bears (Ursus maritimus). Despite capturing over 1,025 females between 1967 and 1998, previously calculated estimates of the size of the southern Beaufort Sea (SBS) population have been unreliable. We improved estimates of numbers of polar bears by modeling heterogeneity in capture probability with covariates. Important covariates referred to the year of the study, age of the bear, capture effort, and geographic location. Our choice of best approximating model was based on the inverse relationship between variance in parameter estimates and likelihood of the fit and suggested a growth from ≈ 500 to over 1,000 females during this study. The mean coefficient of variation on estimates for the last decade of the study was 0.16—the smallest yet derived. A similar model selection approach is recommended for other projects where a best model is not identified by likelihood criteria alone.

  5. Polar bear population dynamics in the southern Beaufort Sea during a period of sea ice decline

    Science.gov (United States)

    Bromaghin, Jeffrey F.; McDonald, Trent L.; Stirling, Ian; Derocher, Andrew E.; Richardson, Evan S.; Regehr, Eric V.; Douglas, David C.; Durner, George M.; Atwood, Todd C.; Amstrup, Steven C.

    2015-01-01

    In the southern Beaufort Sea of the United States and Canada, prior investigations have linked declines in summer sea ice to reduced physical condition, growth, and survival of polar bears (Ursus maritimus). Combined with projections of population decline due to continued climate warming and the ensuing loss of sea ice habitat, those findings contributed to the 2008 decision to list the species as threatened under the U.S. Endangered Species Act. Here, we used mark–recapture models to investigate the population dynamics of polar bears in the southern Beaufort Sea from 2001 to 2010, years during which the spatial and temporal extent of summer sea ice generally declined. Low survival from 2004 through 2006 led to a 25–50% decline in abundance. We hypothesize that low survival during this period resulted from (1) unfavorable ice conditions that limited access to prey during multiple seasons; and possibly, (2) low prey abundance. For reasons that are not clear, survival of adults and cubs began to improve in 2007 and abundance was comparatively stable from 2008 to 2010, with ~900 bears in 2010 (90% CI 606–1212). However, survival of subadult bears declined throughout the entire period. Reduced spatial and temporal availability of sea ice is expected to increasingly force population dynamics of polar bears as the climate continues to warm. However, in the short term, our findings suggest that factors other than sea ice can influence survival. A refined understanding of the ecological mechanisms underlying polar bear population dynamics is necessary to improve projections of their future status and facilitate development of management strategies.

  6. Circumpolar Genetic Structure and Recent Gene Flow of Polar Bears: A Reanalysis.

    Directory of Open Access Journals (Sweden)

    René M Malenfant

    Full Text Available Recently, an extensive study of 2,748 polar bears (Ursus maritimus from across their circumpolar range was published in PLOS ONE, which used microsatellites and mitochondrial haplotypes to apparently show altered population structure and a dramatic change in directional gene flow towards the Canadian Archipelago-an area believed to be a future refugium for polar bears as their southernmost habitats decline under climate change. Although this study represents a major international collaborative effort and promised to be a baseline for future genetics work, methodological shortcomings and errors of interpretation undermine some of the study's main conclusions. Here, we present a reanalysis of this data in which we address some of these issues, including: (1 highly unbalanced sample sizes and large amounts of systematically missing data; (2 incorrect calculation of FST and of significance levels; (3 misleading estimates of recent gene flow resulting from non-convergence of the program BayesAss. In contrast to the original findings, in our reanalysis we find six genetic clusters of polar bears worldwide: the Hudson Bay Complex, the Western and Eastern Canadian Arctic Archipelago, the Western and Eastern Polar Basin, and-importantly-we reconfirm the presence of a unique and possibly endangered cluster of bears in Norwegian Bay near Canada's expected last sea-ice refugium. Although polar bears' abundance, distribution, and population structure will certainly be negatively affected by ongoing-and increasingly rapid-loss of Arctic sea ice, these genetic data provide no evidence of strong directional gene flow in response to recent climate change.

  7. Organohalogen concentrations and a gross and histologic assessment of multiple organ systems in East Greenland polar bears (Ursus maritimus)

    DEFF Research Database (Denmark)

    Sonne, C.

    To investigate the relation between biological parameters, not earlier investigated in the polar bear, and organohalogen pollution in East Greenland polar bears, we initiated a sampling of adipose tissue, internal organs and skulls from more than 100 free-ranging polar bears killed by local...... in the adipose tissue and pathological changes in skulls and internal organs. Our results suggested a decrease in adipose tissue concentrations of organohalogens in East Greenland polar bears from 1990 to 1999-2001. Two of the biological effect parameters (FA and enlarged clitoris) did not indicate a link......, infectious agents, season and meaby chronic exposure to organohalogens. These result fill out an existing knowledge gap in potential effects of environmental, organic contaminants on fluctuating asymmetry, bone mineral density and functional anatomy (histology) in the polar bear. In addition, the results may...

  8. Polar bear population status in the northern Beaufort Sea, Canada, 1971-2006.

    Science.gov (United States)

    Stirling, Ian; McDonald, Trent L; Richardson, E S; Regehr, Eric V; Amstrup, Steven C

    2011-04-01

    Polar bears (Ursus maritimus) of the northern Beaufort Sea (NB) population occur on the perimeter of the polar basin adjacent to the northwestern islands of the Canadian Arctic Archipelago. Sea ice converges on the islands through most of the year. We used open-population capture-recapture models to estimate population size and vital rates of polar bears between 1971 and 2006 to: (1) assess relationships between survival, sex and age, and time period; (2) evaluate the long-term importance of sea ice quality and availability in relation to climate warming; and (3) note future management and conservation concerns. The highest-ranking models suggested that survival of polar bears varied by age class and with changes in the sea ice habitat. Model-averaged estimates of survival (which include harvest mortality) for senescent adults ranged from 0.37 to 0.62, from 0.22 to 0.68 for cubs of the year (COY) and yearlings, and from 0.77 to 0.92 for 2-4 year-olds and adults. Horvtiz-Thompson (HT) estimates of population size were not significantly different among the decades of our study. The population size estimated for the 2000s was 980 +/- 155 (mean and 95% CI). These estimates apply primarily to that segment of the NB population residing west and south of Banks Island. The NB polar bear population appears to have been stable or possibly increasing slightly during the period of our study. This suggests that ice conditions have remained suitable and similar for feeding in summer and fall during most years and that the traditional and legal Inuvialuit harvest has not exceeded sustainable levels. However, the amount of ice remaining in the study area at the end of summer, and the proportion that continues to lie over the biologically productive continental shelf (< 300 m water depth) has declined over the 35-year period of this study. If the climate continues to warm as predicted, we predict that the polar bear population in the northern Beaufort Sea will eventually decline

  9. Reduced body size and cub recruitment in polar bears associated with sea ice decline

    Science.gov (United States)

    Rode, K.D.; Amstrup, Steven C.; Regehr, E.V.

    2010-01-01

    Rates of reproduction and survival are dependent upon adequate body size and condition of individuals. Declines in size and condition have provided early indicators of population decline in polar bears (Ursus maritimus) near the southern extreme of their range. We tested whether patterns in body size, condition, and cub recruitment of polar bears in the southern Beaufort Sea of Alaska were related to the availability of preferred sea ice habitats and whether these measures and habitat availability exhibited trends over time, between 1982 and 2006. The mean skull size and body length of all polar bears over three years of age declined over time, corresponding with long-term declines in the spatial and temporal availability of sea ice habitat. Body size of young, growing bears declined over time and was smaller after years when sea ice availability was reduced. Reduced litter mass and numbers of yearlings per female following years with lower availability of optimal sea ice habitat, suggest reduced reproductive output and juvenile survival. These results, based on analysis of a longterm data set, suggest that declining sea ice is associated with nutritional limitations that reduced body size and reproduction in this population. ?? 2010 by the Ecological Society of America.

  10. Subcutaneous implantation of satellite transmitters with percutaneous antennae into male polar bears (Ursus maritimus)

    Science.gov (United States)

    Mulcahy, D.M.; Garner, G.

    1999-01-01

    Male polar bears (Ursus maritimus) have not been successfully instrumented with satellite transmitters because they readily shed collar-mounted transmitters. Seven male polar bears were captured on the pack ice off the northern coast of Alaska and surgically implanted with satellite transmitters with percutaneous antennae into the subcutaneous space of the dorsal cervical region. Transmitters failed prematurely with lifetimes of 30-161 days (x?? = 97 days). Efforts to relocate implanted bears after transmitters failed were not successful. The mean number of location solutions per transmitter was 204 (range 118-369). An average of 10% and 19% of the locations were accurate to < 150 m and to 150-350 m, respectively. Our successful tracking of male polar bears, the high quality of locations obtained from transmitters with percutaneous antennae implanted in the subcutaneous space, and the low visibility of such units make further technical development worthwhile if the reason for premature failure of the transmitters can be determined. Copyright 1999 by American Association of Zoo Veterinarians.

  11. Polar bears from space: assessing satellite imagery as a tool to track Arctic wildlife.

    Directory of Open Access Journals (Sweden)

    Seth Stapleton

    Full Text Available Development of efficient techniques for monitoring wildlife is a priority in the Arctic, where the impacts of climate change are acute and remoteness and logistical constraints hinder access. We evaluated high resolution satellite imagery as a tool to track the distribution and abundance of polar bears. We examined satellite images of a small island in Foxe Basin, Canada, occupied by a high density of bears during the summer ice-free season. Bears were distinguished from other light-colored spots by comparing images collected on different dates. A sample of ground-truthed points demonstrated that we accurately classified bears. Independent observers reviewed images and a population estimate was obtained using mark-recapture models. This estimate (N: 94; 95% Confidence Interval: 92-105 was remarkably similar to an abundance estimate derived from a line transect aerial survey conducted a few days earlier (N: 102; 95% CI: 69-152. Our findings suggest that satellite imagery is a promising tool for monitoring polar bears on land, with implications for use with other Arctic wildlife. Large scale applications may require development of automated detection processes to expedite review and analysis. Future research should assess the utility of multi-spectral imagery and examine sites with different environmental characteristics.

  12. Bacterial diversity in faeces from polar bear (Ursus maritimus in Arctic Svalbard

    Directory of Open Access Journals (Sweden)

    Brusetti Lorenzo

    2010-01-01

    Full Text Available Abstract Background Polar bears (Ursus maritimus are major predators in the Arctic marine ecosystem, feeding mainly on seals, and living closely associated with sea ice. Little is known of their gut microbial ecology and the main purpose of this study was to investigate the microbial diversity in faeces of polar bears in Svalbard, Norway (74-81°N, 10-33°E. In addition the level of blaTEM alleles, encoding ampicillin resistance (ampr were determined. In total, ten samples were collected from ten individual bears, rectum swabs from five individuals in 2004 and faeces samples from five individuals in 2006. Results A 16S rRNA gene clone library was constructed, and all sequences obtained from 161 clones showed affiliation with the phylum Firmicutes, with 160 sequences identified as Clostridiales and one sequence identified as unclassified Firmicutes. The majority of the sequences (70% were affiliated with the genus Clostridium. Aerobic heterotrophic cell counts on chocolate agar ranged between 5.0 × 104 to 1.6 × 106 colony forming units (cfu/ml for the rectum swabs and 4.0 × 103 to 1.0 × 105 cfu/g for the faeces samples. The proportion of ampr bacteria ranged from 0% to 44%. All of 144 randomly selected ampr isolates tested positive for enzymatic β-lactamase activity. Three % of the ampr isolates from the rectal samples yielded positive results when screened for the presence of blaTEM genes by PCR. BlaTEM alleles were also detected by PCR in two out of three total faecal DNA samples from polar bears. Conclusion The bacterial diversity in faeces from polar bears in their natural environment in Svalbard is low compared to other animal species, with all obtained clones affiliating to Firmicutes. Furthermore, only low levels of blaTEM alleles were detected in contrast to their increasing prevalence in some clinical and commensal bacterial populations.

  13. Xenoestrogenic and dioxin-like activity in blood of East Greenland polar bears (Ursus maritimus).

    Science.gov (United States)

    Erdmann, Simon E; Dietz, Rune; Sonne, Christian; Bechshøft, Thea Ø; Vorkamp, Katrin; Letcher, Robert J; Long, Manhai; Bonefeld-Jørgensen, Eva C

    2013-07-01

    The aims of the project were to (i) extract the lipophilic persistent organic pollutants (POPs) from the blood of 99 East Greenland polar bears and assess the combined mixture effect on the estrogen receptor (ER) and the aryl hydrocarbon receptor (AhR) mediated transactivity; (ii) To evaluate whether the receptor transactivities were associated with selected POP markers, and (iii) compare the receptor transactivities in polar bears with earlier studies on Greenlandic Inuit. Lipophilic POPs were extracted using a combination of solid-phase extraction (SPE) and high performance liquid chromatography (HPLC). ER mediated transactivity was determined using the ER luciferase reporter MVLN cell assay. The extracts were tested alone (XER) and together with 17β-estradiol (E2) as a physiological mimic (XERcomp). Dioxins and dioxin-like (DL) compounds were extracted by a combination of SPE and the Supelco Dioxin Prep System®. AhR mediated dioxin-like transactivity was determined using the AhR luciferase reporter Hepa 1.12cR cell assay. Agonistic ER transactivity was elicited by 19% of the samples, and a further increased E2 induced ER response was found for 52%, whereas 17% antagonized the E2 induced ER response. Positive correlations were found in subadult bears between XER and several POP biomarkers. XER and XERcomp correlated positively to each other. A total of 91% of the polar bear blood extracts elicited agonistic AhR transactivity. The AhR-TCDD equivalent (AhR-TEQ) median levels were higher among adult bears compared to subadult bears, but not significantly.

  14. High‐frequency induced polarization measurements of hydrocarbon‐bearing rocks

    DEFF Research Database (Denmark)

    Burtman, Vladimir; Endo, Masashi; Zhdanov, Michael S.

    2011-01-01

    We have investigated induced polarization (IP) effects in hydrocarbon‐bearing artificial rocks at frequencies greater than 100 Hz. We have examined the instrumental and electrode phase responses of Zonge International's complex resistivity (CR) system, and optimized the performance of the Zonge...... system for IP measurements over the 1 mHz to 10 kHz frequency range. The reliability of the high‐frequency IP measurements were confirmed by independent measurement of the same samples using the Novocontrol BDS 80 system. Our results confirm the presence of IP effects in hydrocarbon‐bearing rocks...

  15. Rebuttal of "Polar bear population forecasts: a public-policy forecasting audit"

    Science.gov (United States)

    Amstrup, Steven C.; Caswell, Hal; DeWeaver, Eric; Stirling, Ian; Douglas, David C.; Marcot, Bruce G.; Hunter, Christine M.

    2009-01-01

    Observed declines in the Arctic sea ice have resulted in a variety of negative effects on polar bears (Ursus maritimus). Projections for additional future declines in sea ice resulted in a proposal to list polar bears as a threatened species under the United States Endangered Species Act. To provide information for the Department of the Interior's listing-decision process, the US Geological Survey (USGS) produced a series of nine research reports evaluating the present and future status of polar bears throughout their range. In response, Armstrong et al. [Armstrong, J. S., K. C. Green, W. Soon. 2008. Polar bear population forecasts: A public-policy forecasting audit. Interfaces 38(5) 382–405], which we will refer to as AGS, performed an audit of two of these nine reports. AGS claimed that the general circulation models upon which the USGS reports relied were not valid forecasting tools, that USGS researchers were not objective or lacked independence from policy decisions, that they did not utilize all available information in constructing their forecasts, and that they violated numerous principles of forecasting espoused by AGS. AGS (p. 382) concluded that the two USGS reports were "unscientific and inconsequential to decision makers." We evaluate the AGS audit and show how AGS are mistaken or misleading on every claim. We provide evidence that general circulation models are useful in forecasting future climate conditions and that corporate and government leaders are relying on these models to do so. We clarify the strict independence of the USGS from the listing decision. We show that the allegations of failure to follow the principles of forecasting espoused by AGS are either incorrect or are based on misconceptions about the Arctic environment, polar bear biology, or statistical and mathematical methods. We conclude by showing that the AGS principles of forecasting are too ambiguous and subjective to be used as a reliable basis for auditing scientific

  16. Comparison of aerial survey procedures for estimating polar bear density: Results of pilot studies in northern Alaska

    Science.gov (United States)

    McDonald, Lyman L.; Garner, Gerald W.; Garner, Gerald W.; Amstrup, Steven C.; Laake, Jeffrey L.; Manly, Bryan F.J.; McDonald, Lyman L.; Robertson, Donna G.

    1999-01-01

    The U.S. Marine Mammal Protection Act (MMPA) and International Agreement on the Conservation of Polar Bears mandate that boundaries and sizes of polar bear (Ursus maritimus) populations be known so they can be managed at optimum sustainable levels. However, data to estimate polar bear numbers for the Chukchi/Bering Sea and Beaufort Sea populations in Alaska are limited. We evaluated aerial line transect methodology for assessing the size of these Alaskan polar bear populations during pilot studies in spring 1987 and summer 1994. In April and May 1987 we flew 12.239 km of transect lines in the northern Bering, Chukchi, and western Beaufort seas. In June 1994 we flew 6.244 km of transect lines in a primary survey unit using a helicopter, and 5,701 km of transect lines in a secondary survey unit using a fixed-wing aircraft in the Beaufort Sea. We examined visibility bias in aerial transect surveys, double counts by independent observers, single-season mark-resight methods, the suitability of using polar bear sign to stratify the study area, and adaptive sampling methods. Fifteen polar bear groups were observed during the 1987 study. Probability of detecting bears decreased with increasing perpendicular distance from the transect line, and probability of detecting polar bear groups likely increased with increasing group size. We estimated population density in high density areas to be 446 km2/bear. In 1994, 15 polar bear groups were observed by independent front and rear seat observers on transect lines in the primary survey unit. Density estimates ranged from 284 km2/bear to 197 km2/bear depending on the model selected. Low polar bear numbers scattered over large areas of polar ice in 1987 indicated that spring is a poor time to conduct aerial surveys. Based on the 1994 survey we determined that ship-based helicopter or land-based fixed-wing aerial surveys conducted at the ice-edge in late summer-early fall may produce robust density estimates for polar bear

  17. Bear

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    The famous physicist made for his scholars this riddle. A fellow encountered a bear in a wasteland. There was nobody else there. Both were frightened and ran away. Fellow to the north, bear to the west. Suddenly the fellow stopped, aimed his gun to the south and shot the bear. What colour was the bear?

  18. Environmental contaminants activate human and polar bear (Ursus maritimus) pregnane X receptors (PXR, NR1I2) differently

    Energy Technology Data Exchange (ETDEWEB)

    Lille-Langøy, Roger, E-mail: Roger.lille-langoy@bio.uib.no [University of Bergen, Department of Biology, P.O. Box 7803, N-5020 Bergen (Norway); Goldstone, Jared V. [Woods Hole Oceanographic Institution, 266 Woods Hole Road, 02543-1050 Woods Hole, MA (United States); Rusten, Marte [University of Bergen, Department of Molecular Biology, P.O. Box 7803, N-5020 Bergen (Norway); Milnes, Matthew R. [Mars Hill University, 100 Athletic Street, Box 6671, Mars Hill, 28754 NC (United States); Male, Rune [University of Bergen, Department of Molecular Biology, P.O. Box 7803, N-5020 Bergen (Norway); Stegeman, John J. [Woods Hole Oceanographic Institution, 266 Woods Hole Road, 02543-1050 Woods Hole, MA (United States); Blumberg, Bruce [University of California, Irvine, 92697 CA (United States); Goksøyr, Anders [University of Bergen, Department of Biology, P.O. Box 7803, N-5020 Bergen (Norway)

    2015-04-01

    Background: Many persistent organic pollutants (POPs) accumulate readily in polar bears because of their position as apex predators in Arctic food webs. The pregnane X receptor (PXR, formally NR1I2, here proposed to be named promiscuous xenobiotic receptor) is a xenobiotic sensor that is directly involved in metabolizing pathways of a wide range of environmental contaminants. Objectives: In the present study, we comparably assess the ability of 51 selected pharmaceuticals, pesticides and emerging contaminants to activate PXRs from polar bears and humans using an in vitro luciferase reporter gene assay. Results: We found that polar bear PXR is activated by a wide range of our test compounds (68%) but has a slightly more narrow ligand specificity than human PXR that was activated by 86% of the 51 test compounds. The majority of the agonists identified (70%) produces a stronger induction of the reporter gene via human PXR than via polar bear PXR, however with some notable and environmentally relevant exceptions. Conclusions: Due to the observed differences in activation of polar bear and human PXRs, exposure of each species to environmental agents is likely to induce biotransformation differently in the two species. Bioinformatics analyses and structural modeling studies suggest that amino acids that are not part of the ligand-binding domain and do not interact with the ligand can modulate receptor activation. - Highlights: • Comparative study of ligand activation of human and polar bear PXRs. • Polar bear PXR is a promiscuous ligand-activated nuclear receptor but less so than human PXR. • Environmental contaminants activate human and polar bear PXRs differently. • Expression and ligand promiscuity indicate that PXR is a xenosensor in polar bears.

  19. Hematology of southern Beaufort Sea polar bears (2005-2007): Biomarker for an arctic ecosystem health sentinel

    Science.gov (United States)

    Kirk, Cassandra M.; Amstrup, S.; Swor, Rhonda; Holcomb, Darce; O'Hara, T. M.

    2010-01-01

    Declines in sea-ice habitats have resulted in declining stature, productivity, and survival of polar bears in some regions. With continuing sea-ice declines, negative population effects are projected to expand throughout the polar bear's range. Precise causes of diminished polar bear life history performance are unknown, however, climate and sea-ice condition change are expected to adversely impact polar bear (Ursus maritimus) health and population dynamics. As apex predators in the Arctic, polar bears integrate the status of lower trophic levels and are therefore sentinels of ecosystem health. Arctic residents feed at the apex of the ecosystem, thus polar bears can serve as indicators of human health in the Arctic. Despite their value as indicators of ecosystem welfare, population-level health data for U.S. polar bears are lacking. We present hematological reference ranges for southern Beaufort Sea polar bears. Hematological parameters in southern Beaufort Sea polar bears varied by age, geographic location, and reproductive status. Total leukocytes, lymphocytes, monocytes, eosinophils, and serum immunoglobulin G were significantly greater in males than females. These measures were greater in nonlactating females ages ???5, than lactating adult females ages ???5, suggesting that females encumbered by young may be less resilient to new immune system challenges that may accompany ongoing climate change. Hematological values established here provide a necessary baseline for anticipated changes in health as arctic temperatures warm and sea-ice declines accelerate. Data suggest that females with dependent young may be most vulnerable to these changes and should therefore be a targeted cohort for monitoring in this sentinel. ?? 2010 International Association for Ecology and Health.

  20. Forecasting the relative influence of environmental and anthropogenic stressors on polar bears

    Science.gov (United States)

    Atwood, Todd C.; Marcot, Bruce G; Douglas, David C.; Amstrup, Steven C.; Rode, Karyn D.; Durner, George M.; Bromaghin, Jeffrey F.

    2016-01-01

    Effective conservation planning requires understanding and ranking threats to wildlife populations. We developed a Bayesian network model to evaluate the relative influence of environmental and anthropogenic stressors, and their mitigation, on the persistence of polar bears (Ursus maritimus). Overall sea ice conditions, affected by rising global temperatures, were the most influential determinant of population outcomes. Accordingly, unabated rise in atmospheric greenhouse gas (GHG) concentrations was the dominant influence leading to worsened population outcomes, with polar bears in three of four ecoregions reaching a dominant probability of decreased or greatly decreased by the latter part of this century. Stabilization of atmospheric GHG concentrations by mid-century delayed the greatly reduced state by ≈25 yr in two ecoregions. Prompt and aggressive mitigation of emissions reduced the probability of any regional population becoming greatly reduced by up to 25%. Marine prey availability, linked closely to sea ice trend, had slightly less influence on outcome state than sea ice availability itself. Reduced mortality from hunting and defense of life and property interactions resulted in modest declines in the probability of a decreased or greatly decreased population outcome. Minimizing other stressors such as trans-Arctic shipping, oil and gas exploration, and contaminants had a negligible effect on polar bear outcomes, although the model was not well-informed with respect to the potential influence of these stressors. Adverse consequences of loss of sea ice habitat became more pronounced as the summer ice-free period lengthened beyond four months, which could occur in most of the Arctic basin after mid-century if GHG emissions are not promptly reduced. Long-term conservation of polar bears would be best supported by holding global mean temperature to ≤ 2°C above preindustrial levels. Until further sea ice loss is stopped, management of other stressors may

  1. Acute Chagas' cardiopathy in a polar bear (Ursus maritimus in Guadalajara, Mexico

    Directory of Open Access Journals (Sweden)

    Jaime-Andrade G. J.

    1997-01-01

    Full Text Available We report a 24 year old female polar bear (Ursus maritimus who contracted Chagas' infection at the Guadalajara Zoo, in Jalisco, México, and died of acute Chagas' carditis 15 days later. The histopathological findings are described, as well as the presence of triatomines (Triatoma longipennis Usinger infected with Trypanosoma cruzi collected within 5 meters from the place where the animal lived in the city of Guadalajara.

  2. Costs of locomotion in polar bears: when do the costs outweigh the benefits of chasing down terrestrial prey?

    Science.gov (United States)

    Gormezano, Linda J.; McWilliams, Scott R.; Iles, David T.; Rockwell, Robert F.

    2016-01-01

    Trade-offs between locomotory costs and foraging gains are key elements in determining constraints on predator–prey interactions. One intriguing example involves polar bears pursuing snow geese on land. As climate change forces polar bears to spend more time ashore, they may need to expend more energy to obtain land-based food. Given that polar bears are inefficient at terrestrial locomotion, any extra energy expended to pursue prey could negatively impact survival. However, polar bears have been regularly observed engaging in long pursuits of geese and other land animals, and the energetic worth of such behaviour has been repeatedly questioned. We use data-driven energetic models to examine how energy expenditures vary across polar bear mass and speed. For the first time, we show that polar bears in the 125–235 kg size range can profitably pursue geese, especially at slower speeds. We caution, however, that heat build-up may be the ultimate limiting factor in terrestrial chases, especially for larger bears, and this limit would be reached more quickly with warmer environmental temperatures. PMID:27757238

  3. 75 FR 65507 - U.S.-Russia Polar Bear Commission Adopts an Annual Taking Limit for the Alaska-Chukotka Polar...

    Science.gov (United States)

    2010-10-25

    ... CONTACT: Terry D. DeBruyn, Polar Bear Project Leader, U.S. Fish and Wildlife Service, Marine Mammals... management regime for the subsistence harvest of bears is key to both providing for the long-term viability... parameters and resulting estimate of sustainable subsistence removals were based on expert opinion of...

  4. Serological evidence of morbillivirus infection in polar bears (Ursus maritimus) from Alaska and Russia

    Science.gov (United States)

    Follmann, E.H.; Garner, G.W.; Evermann, Jim F.; McKeirnan,, A.J.

    1996-01-01

    One-hundred-and-ninety-one samples of blood serum collected from 186 polar bears (Ursus maritimus) between 1987 and 1992 were analysed for morbillivirus antibodies. The samples were collected in the Bering, Chukchi and East Siberian seas. Sixty-eight samples (35.6 per cent) had morbillivirus antibody titres > 5; the percentage of positive samples ranged from 26.2 to 46.2 per cent from year to year. The proportions of adults, sub-adults and cubs which were seropositive were 43.9, 35.7 and 37.9 per cent respectively. Some seropositive dams had seronegative young and some that were seronegative had seropositive young. One litter of two cubs, in which the dam was seronegative, had one seropositive and one seronegative cub. Seropositive bears occurred in all the areas from which the samples were collected but there was a significantly greater incidence in the bears sampled in Russia. The high prevalence of seropositive bears over the period suggests that the bear morbillivirus is endemic in these regions of the Arctic, but its source is unknown.

  5. A novel method for analysing key corticosteroids in polar bear (Ursusmaritimus) hair using liquid chromatography tandem massspectrometry

    DEFF Research Database (Denmark)

    Weisser, Johan J.; Hansen, Martin; Björklund, Erland

    2016-01-01

    This paper presents the development and evaluation of a methodology for extraction, clean-up and analysis of three key corticosteroids (aldosterone, cortisol and corticosterone) in polar bear hair. Such a methodology can be used to monitor stress biomarkers in polar bears and may provide....... This procedure allows for the simultaneous determination of multiple steroids, which is in contrast to previous polar bear studies based on ELISA techniques. Absolute method recoveries were 81%, 75% and 60% for cortisol, corticosterone and aldosterone, respectively. We applied the developed method on a hair...... sample pooled from four East Greenland polar bears. Herein cortisol and corticosterone were successfully determined in levels of 0.32±0.02ng/g hair and 0.13±0.02ng/g hair, respectively. Aldosterone was below limit of detection (LOD

  6. Limitations of GIS and remote sensing for considering spatial and temporal change in studies of habitat use by polar bears

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — To investigate the feasibility of using satellite-based remote sensing to study habitat use of polar bears {Ursus aritimus), we compared distributions of satellite...

  7. Increasing nest predation will be insufficient to maintain polar bear body condition in the face of sea ice loss.

    Science.gov (United States)

    Dey, Cody J; Richardson, Evan; McGeachy, David; Iverson, Samuel A; Gilchrist, Hugh G; Semeniuk, Christina A D

    2017-05-01

    Climate change can influence interspecific interactions by differentially affecting species-specific phenology. In seasonal ice environments, there is evidence that polar bear predation of Arctic bird eggs is increasing because of earlier sea ice breakup, which forces polar bears into nearshore terrestrial environments where Arctic birds are nesting. Because polar bears can consume a large number of nests before becoming satiated, and because they can swim between island colonies, they could have dramatic influences on seabird and sea duck reproductive success. However, it is unclear whether nest foraging can provide an energetic benefit to polar bear populations, especially given the capacity of bird populations to redistribute in response to increasing predation pressure. In this study, we develop a spatially explicit agent-based model of the predator-prey relationship between polar bears and common eiders, a common and culturally important bird species for northern peoples. Our model is composed of two types of agents (polar bear agents and common eider hen agents) whose movements and decision heuristics are based on species-specific bioenergetic and behavioral ecological principles, and are influenced by historical and extrapolated sea ice conditions. Our model reproduces empirical findings that polar bear predation of bird nests is increasing and predicts an accelerating relationship between advancing ice breakup dates and the number of nests depredated. Despite increases in nest predation, our model predicts that polar bear body condition during the ice-free period will continue to decline. Finally, our model predicts that common eider nests will become more dispersed and will move closer to the mainland in response to increasing predation, possibly increasing their exposure to land-based predators and influencing the livelihood of local people that collect eider eggs and down. These results show that predator-prey interactions can have nonlinear responses to

  8. Arctic Forecasts Available from Polar Bear Exhibit as an Example of Formal/Informal Collaboration

    Science.gov (United States)

    Landis, C. E.; Cervenec, J.

    2012-12-01

    A subset of the general population enjoys and frequents informal education venues, offering an opportunity for lifelong learning that also enhances and supports formal education efforts. The Byrd Polar Research Center (BPRC) at The Ohio State University collaborated with the Columbus Zoo & Aquarium (CZA) in the development of their Polar Frontier exhibit, from its initial planning to the Grand Opening of the exhibit, through the present. Of course, the addition to the Zoo of polar bears and Arctic fox in the Polar Frontier has been very popular, with almost a 7% increase in visitors in 2010 when the exhibit opened. The CZA and BPRC are now investigating ways to increase the climate literacy impact of the exhibit, and to increase engagement with the topics through follow-on activities. For example, individuals or classes anywhere in the world can check forecasts from the Polar Weather and Research Forecasting model and compare them to observed conditions-- allowing deep investigation into changes in the Arctic. In addition, opportunities exist to adapt the Zoo School experience (affecting several Central Ohio school districts) and/or to enable regular participation through social media such as Facebook, Twitter, and other forms of digital communication. BPRC's sustained engagement with the CZA is an example of a trusted and meaningful partnership where open dialogue exists about providing the best learning experience for visitors. This presentation will share some of the lessons learned from this unique partnership, and strategies that are adopted to move it forward.

  9. Numerical analysis of fundamental characteristics of superconducting magnetic bearings for a polarization modulator

    Science.gov (United States)

    Terachi, Yusuke; Terao, Yutaka; Ohsaki, Hiroyuki; Sakurai, Yuki; Matsumura, Tomotake; Sugai, Hajime; Utsunomiya, Shin; Kataza, Hirokazu; Yamamoto, Ryo

    2017-07-01

    We have carried out numerical analysis of mechanical properties of a superconducting magnetic bearing (SMB). A contactless bearing operating at below 10 K with low rotational energy loss is an attractive feature to be used as a rotational mechanism of a polarization modulator for a cosmic microwave background experiment. In such application, a rotor diameter of about 400 mm forces us to employ a segmented magnet. As a result, there is inevitable spatial gap between the segments. In order to understand the path towards the design optimizations, 2D and 3D FEM analyses were carried out to examine fundamental characteristics of the SMBs for a polarization modulator. Two axial flux type SMBs were dealt with in the analysis: (a) the SMB with axially magnetized permanent magnets (PMs), and (b) the SMB with radially magnetized PMs and steel components for magnetic flux paths. Magnetic flux lines and density distributions, electromagnetic force characteristics, spring constants, etc. were compared among some variations of the SMBs. From the numerical analysis results, it is discussed what type, configuration and design of SMBs are more suitable for a polarization modulator.

  10. Distribution of vitamins A (retinol) and E (alpha-tocopherol) in polar bear kidney: Implications for biomarker studies

    DEFF Research Database (Denmark)

    Bechshøft, T.Ø.; Jakobsen, Jette; Sonne, C.

    2011-01-01

    of the organ to sample in order to get a representative value for this important biomarker. The aim here was to assess the distribution of vitamins A (retinol) and E (α-tocopherol) within the polar bear multireniculate kidney (i.e. polar vs. medial position) and also within the cortex vs. medulla of each...

  11. Enhanced biological processes associated with alopecia in polar bears (Ursus maritimus).

    Science.gov (United States)

    Bowen, Lizabeth; Miles, A Keith; Stott, Jeffrey; Waters, Shannon; Atwood, Todd

    2015-10-01

    Populations of wildlife species worldwide experience incidents of mass morbidity and mortality. Primary or secondary drivers of these events may escape classical detection methods for identifying microbial insults, toxin exposure, or additional stressors. In 2012, 28% of polar bears sampled in a study in the southern Beaufort Sea region of Alaska had varying degrees of alopecia that was concomitant with reduced body condition. Concurrently, elevated numbers of sick or dead ringed seals were detected in the southern Beaufort, Chukchi, and Bering seas in 2012, resulting in the declaration of an unusual mortality event (UME) by the National Oceanic and Atmospheric Administration (NOAA). The primary and possible ancillary causative stressors of these events are unknown, and related physiological changes within individual animals have been undetectable using classical diagnostic methods. Here we present an emerging technology as a potentially guiding investigative approach aimed at elucidating the circumstances responsible for the susceptibility of certain polar bears to observed conditions. Using transcriptomic analysis we identified enhanced biological processes including immune response, viral defense, and response to stress in polar bears with alopecia. Our results support an alternative mechanism of investigation into the causative agents that, when used proactively, could serve as an early indicator for populations and species at risk. We suggest that current or classical methods for investigation into events of unusual morbidity and mortality can be costly, sometimes unfocused, and often inconclusive. Advances in technology allow for implementation of a holistic system of surveillance and investigation that could provide early warning of health concerns in wildlife species important to humans.

  12. Enhanced biological processes associated with alopecia in polar bears (Ursus maritimus)

    Science.gov (United States)

    Bowen, Lizabeth; Miles, A. Keith; Stott, Jeffrey L.; Waters, Shannon C.; Atwood, Todd C.

    2015-01-01

    Populations of wildlife species worldwide experience incidents of mass morbidity and mortality. Primary or secondary drivers of these events may escape classical detection methods for identifying microbial insults, toxin exposure, or additional stressors. In 2012, 28% of polar bears sampled in a study in the southern Beaufort Sea region of Alaska had varying degrees of alopecia that was concomitant with reduced body condition. Concurrently, elevated numbers of sick or dead ringed seals were detected in the southern Beaufort, Chukchi, and Bering seas in 2012, resulting in the declaration of an unusual mortality event (UME) by the National Oceanic and Atmospheric Administration (NOAA). The primary and possible ancillary causative stressors of these events are unknown, and related physiological changes within individual animals have been undetectable using classical diagnostic methods. Here we present an emerging technology as a potentially guiding investigative approach aimed at elucidating the circumstances responsible for the susceptibility of certain polar bears to observed conditions. Using transcriptomic analysis we identified enhanced biological processes including immune response, viral defense, and response to stress in polar bears with alopecia. Our results support an alternative mechanism of investigation into the causative agents that, when used proactively, could serve as an early indicator for populations and species at risk. We suggest that current or classical methods for investigation into events of unusual morbidity and mortality can be costly, sometimes unfocused, and often inconclusive. Advances in technology allow for implementation of a holistic system of surveillance and investigation that could provide early warning of health concerns in wildlife species important to humans.

  13. Textile solar light collectors based on models for polar bear hair

    Energy Technology Data Exchange (ETDEWEB)

    Bahners, Thomas; Schlosser, Uwe; Schollmeyer, Eckhard [Deutsches Textilforschungszentrum Nord-West e.V., Adlerstr. 1, D-47798 Krefeld (Germany); Gutmann, Rainer [Institut fuer Textilchemie und Chemiefasern, Koerschtalstr. 26, D-73770 Denkendorf (Germany)

    2008-12-15

    Concepts of technical fibers following models for the polar bear hair to be used for textile solar collectors are discussed. The approach to coat fibers with a thin layer into which fluorescent dyestuff was dispersed was studied experimentally. Modified fibers made of different polymers were characterized with respect to optical properties relevant for the bionic model. In the case of poly(methylmethacrylate) fibers, the envisaged effect could be achieved to high efficiency. The optical performance could be enhanced by ultrasonic dispersion of the dyestuff in the coating matrix. The effect is less significant in semi-crystalline fibers such as poly(ethylene terephthalate), which is attributed to diffuse scattering. (author)

  14. Tasmanian tigers and polar bears: The documentary moving image and (species loss

    Directory of Open Access Journals (Sweden)

    Belinda Smaill

    2015-04-01

    Full Text Available In this essay I explore how two divergent examples of the nonfiction moving image can be understood in relation to the problem of representing species loss. The species that provide the platform for this consideration are the thylacine, better known as the Tasmanian tiger, and the polar bear. They represent the two contingencies of species loss: endangerment and extinction. My analysis is structured around moving images from the 1930s of the last known thylacine and the very different example of Arctic Tale (Adam Ravetch, Sarah Robertson, 2007, a ‘Disneyfied’ film that dramatises climate change and its impact on the polar bear. Species loss is frequently perceived in a humanist sense, reflecting how we ‘imagine ourselves’ or anthropocentric charactersations of non-human others. I offer a close analysis of the two films, examining the problem of representing extinction through a consideration of the play of absence and presence, vitality and extinguishment, that characterises both the ontology of cinema and narratives about species loss.

  15. Organohalogen concentrations in blood and adipose tissue of Southern Beaufort Sea polar bears

    Science.gov (United States)

    Bentzen, T.W.; Muir, D.C.G.; Amstrup, Steven C.; O'Hara, T. M.

    2008-01-01

    We analyzed 151 organohalogen chemicals (OHCs) in whole blood and subcutaneous fat of 57 polar bears sampled along the Alaskan Beaufort Sea coast in spring, 2003. All major organochlorine pesticides, PCBs, PBDEs and their congeners were assessed. Concentrations of most OHCs continue to be lower among Southern Beaufort Sea polar bears than reported for other populations. Additionally, toxaphenes and related compounds were assessed in adipose tissue, and 8 perflourinated compounds (PFCs) were examined in blood. Perfluorooctane sulfonate (PFOS) concentrations exceeded those of any other contaminant measured in blood. ??Chlordane concentrations were higher in females, and both ??PCBs and ??Chlordane concentrations in adipose tissue decreased significantly with age. The rank order of OHC mean concentrations; ??PCB > ??10PCB > PCB153 > ??Chlordane > Oxychlordane > PCB180 > ??HCH > ??-HCH > ??DDT > p,p-DDE > ??PBDE > HCB > Toxaphene was similar for compounds above detection limits in both fat and blood. Although correlation between OHC concentrations in blood and adipose tissue was examined, the predictability of concentrations in one matrix for the other was limited. ?? 2008 Elsevier B.V.

  16. Implications of the circumpolar genetic structure of polar bears for their conservation in a rapidly warming Arctic

    Science.gov (United States)

    Peacock, Elizabeth; Sonsthagen, Sarah A.; Obbard, Martyn E.; Boltunov, Andrei N.; Regehr, Eric V.; Ovsyanikov, Nikita; Aars, Jon; Atkinson, Stephen N.; Sage, George K.; Hope, Andrew G.; Zeyl, Eve; Bachmann, Lutz; Ehrich, Dorothee; Scribner, Kim T.; Amstrup, Steven C.; Belikov, Stanislav; Born, Erik W.; Derocher, Andrew E.; Stirling, Ian; Taylor, Mitchell K.; Wiig, Øystein; Paetkau, David; Talbot, Sandra L.

    2015-01-01

    We provide an expansive analysis of polar bear (Ursus maritimus) circumpolar genetic variation during the last two decades of decline in their sea-ice habitat. We sought to evaluate whether their genetic diversity and structure have changed over this period of habitat decline, how their current genetic patterns compare with past patterns, and how genetic demography changed with ancient fluctuations in climate. Characterizing their circumpolar genetic structure using microsatellite data, we defined four clusters that largely correspond to current ecological and oceanographic factors: Eastern Polar Basin, Western Polar Basin, Canadian Archipelago and Southern Canada. We document evidence for recent (ca. last 1–3 generations) directional gene flow from Southern Canada and the Eastern Polar Basin towards the Canadian Archipelago, an area hypothesized to be a future refugium for polar bears as climate-induced habitat decline continues. Our data provide empirical evidence in support of this hypothesis. The direction of current gene flow differs from earlier patterns of gene flow in the Holocene. From analyses of mitochondrial DNA, the Canadian Archipelago cluster and the Barents Sea subpopulation within the Eastern Polar Basin cluster did not show signals of population expansion, suggesting these areas may have served also as past interglacial refugia. Mismatch analyses of mitochondrial DNA data from polar and the paraphyletic brown bear (U. arctos) uncovered offset signals in timing of population expansion between the two species, that are attributed to differential demographic responses to past climate cycling. Mitogenomic structure of polar bears was shallow and developed recently, in contrast to the multiple clades of brown bears. We found no genetic signatures of recent hybridization between the species in our large, circumpolar sample, suggesting that recently observed hybrids represent localized events. Documenting changes in subpopulation connectivity will

  17. Implications of the circumpolar genetic structure of polar bears for their conservation in a rapidly warming Arctic.

    Directory of Open Access Journals (Sweden)

    Elizabeth Peacock

    Full Text Available We provide an expansive analysis of polar bear (Ursus maritimus circumpolar genetic variation during the last two decades of decline in their sea-ice habitat. We sought to evaluate whether their genetic diversity and structure have changed over this period of habitat decline, how their current genetic patterns compare with past patterns, and how genetic demography changed with ancient fluctuations in climate. Characterizing their circumpolar genetic structure using microsatellite data, we defined four clusters that largely correspond to current ecological and oceanographic factors: Eastern Polar Basin, Western Polar Basin, Canadian Archipelago and Southern Canada. We document evidence for recent (ca. last 1-3 generations directional gene flow from Southern Canada and the Eastern Polar Basin towards the Canadian Archipelago, an area hypothesized to be a future refugium for polar bears as climate-induced habitat decline continues. Our data provide empirical evidence in support of this hypothesis. The direction of current gene flow differs from earlier patterns of gene flow in the Holocene. From analyses of mitochondrial DNA, the Canadian Archipelago cluster and the Barents Sea subpopulation within the Eastern Polar Basin cluster did not show signals of population expansion, suggesting these areas may have served also as past interglacial refugia. Mismatch analyses of mitochondrial DNA data from polar and the paraphyletic brown bear (U. arctos uncovered offset signals in timing of population expansion between the two species, that are attributed to differential demographic responses to past climate cycling. Mitogenomic structure of polar bears was shallow and developed recently, in contrast to the multiple clades of brown bears. We found no genetic signatures of recent hybridization between the species in our large, circumpolar sample, suggesting that recently observed hybrids represent localized events. Documenting changes in subpopulation

  18. Skull pathology in East Greenland and Svalbard polar bears (Ursus maritimus) during 1892 to 2002 in relation to organochlorine pollution

    Energy Technology Data Exchange (ETDEWEB)

    Sonne, Christian [National Environmental Research Institute, Department of Arctic Environment, Frederiksborgvej 399, DK-4000 Roskilde (Denmark) and Department of Veterinary Basic Sciences, Royal Veterinary and Agricultural University, Buelowsvej 17, DK-1870 Frederiksberg C (Denmark)]. E-mail: csh@dmu.dk; Riget, Frank F. [National Environmental Research Institute, Department of Arctic Environment, Frederiksborgvej 399, DK-4000 Roskilde (Denmark); Dietz, Rune [National Environmental Research Institute, Department of Arctic Environment, Frederiksborgvej 399, DK-4000 Roskilde (Denmark); Wiig, Oystein [Natural History Museum, University of Oslo, PO Box 1172 Blindern, N-0562 Oslo (Norway); Kirkegaard, Maja [National Environmental Research Institute, Department of Arctic Environment, Frederiksborgvej 399, DK-4000 Roskilde (Denmark); Born, Erik W. [Greenland Institute of Natural Resources, PO Box 570, DK-3900 Nuuk, Greenland (Denmark)

    2007-01-01

    East Greenland and Svalbard polar bears (Ursus maritimus) are heavily polluted with long-range transported organochlorines such as PCBs (polychlorinated biphenyls). To investigate the negative health impacts, a time-trend study of skull pathology was conducted on 269 East Greenland and 241 Svalbard polar bears. The skulls were sampled during 1892-2002 and 1964-1992, respectively. Seven different pathological changes were found: adonti, displacement of teeth, caries, osseous proliferations, exostosis, tooth wear and periodontitis. Only tooth wear and periodontitis was in a prevalence that allowed statistical treatment. The most severe cases of tooth wear and periodontitis were accompanied by a substantial loss of alveolar bone structure. The prevalence of tooth wear and periodontitis increased significantly with age (p < 0.001) with incisor wear being more severe than in canines, premolars and molars (p < 0.001). No sex difference was found for tooth wear (p = 0.22) while a significant difference between sexes was found for periodontitis (p = 0.01) with males having higher prevalence than females (odds ratio of 2.5 for males:females). In East Greenland, the prevalence of tooth wear was significantly higher in polar bears collected in the pre pollution period (< 1960) than in bears sampled during polluted periods (1960-1980 and 1981-2002) (p < 0.001). Regarding periodontitis, the prevalence was not significantly different between pre-pollution and pollution periods (p = 0.309). Polar bears from Svalbard had significantly higher prevalence of tooth wear (p < 0.001) and periodontitis (p = 0.02) than polar bears from East Greenland. The tooth wear and periodontitis odds ratios for Svalbard:East Greenland were 135 and 2.6, respectively. Hence, we found a clear age/sex link and geographical difference but no evidence for an association between skull pathology and exposure to organochlorines in East Greenland and Svalbard polar bears.

  19. Polar Bear Optimization Algorithm: Meta-Heuristic with Fast Population Movement and Dynamic Birth and Death Mechanism

    Directory of Open Access Journals (Sweden)

    Dawid Połap

    2017-09-01

    Full Text Available In the proposed article, we present a nature-inspired optimization algorithm, which we called Polar Bear Optimization Algorithm (PBO. The inspiration to develop the algorithm comes from the way polar bears hunt to survive in harsh arctic conditions. These carnivorous mammals are active all year round. Frosty climate, unfavorable to other animals, has made polar bears adapt to the specific mode of exploration and hunting in large areas, not only over ice but also water. The proposed novel mathematical model of the way polar bears move in the search for food and hunt can be a valuable method of optimization for various theoretical and practical problems. Optimization is very similar to nature, similarly to search for optimal solutions for mathematical models animals search for optimal conditions to develop in their natural environments. In this method. we have used a model of polar bear behaviors as a search engine for optimal solutions. Proposed simulated adaptation to harsh winter conditions is an advantage for local and global search, while birth and death mechanism controls the population. Proposed PBO was evaluated and compared to other meta-heuristic algorithms using sample test functions and some classical engineering problems. Experimental research results were compared to other algorithms and analyzed using various parameters. The analysis allowed us to identify the leading advantages which are rapid recognition of the area by the relevant population and efficient birth and death mechanism to improve global and local search within the solution space.

  20. Changing Arctic Ecosystems: Updated forecast: Reducing carbon dioxide (CO2) emissions required to improve polar bear outlook

    Science.gov (United States)

    Oakley, Karen L.; Atwood, Todd C.; Mugel, Douglas N.; Rode, Karyn D.; Whalen, Mary E.

    2015-01-01

    The Arctic is warming faster than other regions of the world due to the loss of snow and ice, which increases the amount of solar energy absorbed by the region. The most visible consequence has been the rapid decline in sea ice over the last 3 decades-a decline projected to bring long ice-free summers if greenhouse gas (GHG) emissions are not significantly reduced. The polar bear (Ursus maritimus) depends on sea ice over the biologically productive continental shelves of the Arctic Ocean as a platform for hunting seals. In 2008, the U.S. Fish and Wildlife Service listed the polar bear as threatened under the Endangered Species Act (ESA) due to the threat posed by sea ice loss. The polar bear was the first species to be listed due to forecasted population declines from climate change.

  1. Exposure to mixtures of organohalogen contaminants and associative interactions with thyroid hormones in East Greenland polar bears (Ursus maritimus)

    DEFF Research Database (Denmark)

    Villanger, Gro D.; Jenssen, Bjørn M.; Fjeldberg, Rita R.

    2011-01-01

    We investigated the multivariate relationships between adipose tissue residue levels of 48 individual organohalogen contaminants (OHCs) and circulating thyroid hormone (TH) levels in polar bears (Ursus maritimus) from East Greenland (1999–2001, n=62), using projection to latent structure (PLS......) regression for four groupings of polar bears; subadults (SubA), adult females with cubs (AdF_N), adult females without cubs (AdF_S) and adult males (AdM). In the resulting significant PLS models for SubA, AdF_N and AdF_S, some OHCs were especially important in explaining variations in circulating TH levels...... that influenced TH levels in the significant PLS models may potentially act through similar mechanisms on the hypothalamic–pituitary–thyroid (HPT) axis, suggesting that both combined effects by dose and response addition and perhaps synergistic potentiation may be a possibility in these polar bears. Statistical...

  2. The endocrine disruption properties of an adipose contaminant mixture extracted from East Greenland polar bears studied in the H295R cell line

    DEFF Research Database (Denmark)

    Hjorth, R.; Letcher, R. J.; Blair, D.

    been well described and especially the polar bear (Ursus maritimus) is recognized as being one of the most contaminated species in the Arctic. The present study investigated the in vitro endocrine disruptive effects of the POP mixture found in adipose tissue from 10 East Greenland polar bears collected...... (dehydroepiandrosterone and androstenedione). These results demonstrated comprehensive in vitro effects of POPs extracted from polar bear adipose tissue on key elements in the steroidogenesis, and identifies disruption of CYP17 activity as a mode of action. A POP-induced interference with CYP17 can potentially explain...... previously observed hormone levels in polar bears and could pose a risk to their reproductive health....

  3. Long-distance swimming by polar bears (Ursus maritimus) of the southern Beaufort Sea during years of extensive open water

    Science.gov (United States)

    2014-01-01

    Polar bears (Ursus maritimus Phipps, 1774) depend on sea ice for catching marine mammal prey. Recent sea-ice declines have been linked to reductions in body condition, survival, and population size. Reduced foraging opportunity is hypothesized to be the primary cause of sea-ice-linked declines, but the costs of travel through a deteriorated sea-ice environment also may be a factor. We used movement data from 52 adult female polar bears wearing Global Positioning System (GPS) collars, including some with dependent young, to document long-distance swimming (>50 km) by polar bears in the southern Beaufort and Chukchi seas. During 6 years (2004-2009), we identified 50 long-distance swims by 20 bears. Swim duration and distance ranged from 0.7 to 9.7 days (mean = 3.4 days) and 53.7 to 687.1 km (mean = 154.2 km), respectively. Frequency of swimming appeared to increase over the course of the study. We show that adult female polar bears and their cubs are capable of swimming long distances during periods when extensive areas of open water are present. However, long-distance swimming appears to have higher energetic demands than moving over sea ice. Our observations suggest long-distance swimming is a behavioral response to declining summer sea-ice conditions.

  4. Anti-NMDA Receptor Encephalitis in the Polar Bear (Ursus maritimus) Knut.

    Science.gov (United States)

    Prüss, H; Leubner, J; Wenke, N K; Czirják, G Á; Szentiks, C A; Greenwood, A D

    2015-08-27

    Knut the polar bear of the Berlin Zoological Garden drowned in 2011 following seizures and was diagnosed as having suffered encephalitis of unknown etiology after exhaustive pathogen screening. Using the diagnostic criteria applied to human patients, we demonstrate that Knut's encephalitis is almost identical to anti-NMDA receptor encephalitis which is a severe autoimmune disease representing the most common non-infectious encephalitis in humans. High concentrations of antibodies specific against the NR1 subunit of the NMDA receptor were detected in Knut's cerebrospinal fluid. Histological examination demonstrated very similar patterns of plasma cell infiltration and minimal neuronal loss in affected brain areas. We conclude that Knut suffered anti-NMDA receptor encephalitis making his the first reported non-human case of this treatable disease. The results suggest that anti-NMDA receptor encephalitis may be a disease of broad relevance to mammals that until now has remained undiagnosed.

  5. Estimating Allee dynamics before they can be observed: polar bears as a case study.

    Directory of Open Access Journals (Sweden)

    Péter K Molnár

    Full Text Available Allee effects are an important component in the population dynamics of numerous species. Accounting for these Allee effects in population viability analyses generally requires estimates of low-density population growth rates, but such data are unavailable for most species and particularly difficult to obtain for large mammals. Here, we present a mechanistic modeling framework that allows estimating the expected low-density growth rates under a mate-finding Allee effect before the Allee effect occurs or can be observed. The approach relies on representing the mechanisms causing the Allee effect in a process-based model, which can be parameterized and validated from data on the mechanisms rather than data on population growth. We illustrate the approach using polar bears (Ursus maritimus, and estimate their expected low-density growth by linking a mating dynamics model to a matrix projection model. The Allee threshold, defined as the population density below which growth becomes negative, is shown to depend on age-structure, sex ratio, and the life history parameters determining reproduction and survival. The Allee threshold is thus both density- and frequency-dependent. Sensitivity analyses of the Allee threshold show that different combinations of the parameters determining reproduction and survival can lead to differing Allee thresholds, even if these differing combinations imply the same stable-stage population growth rate. The approach further shows how mate-limitation can induce long transient dynamics, even in populations that eventually grow to carrying capacity. Applying the models to the overharvested low-density polar bear population of Viscount Melville Sound, Canada, shows that a mate-finding Allee effect is a plausible mechanism for slow recovery of this population. Our approach is generalizable to any mating system and life cycle, and could aid proactive management and conservation strategies, for example, by providing a priori

  6. Xenoestrogenic and dioxin-like activity in blood of East Greenland polar bears (Ursus maritimus)

    DEFF Research Database (Denmark)

    Erdmann, Simon Erik; Dietz, Rune; Sonne, Christian

    2013-01-01

    chromatography (HPLC). ER mediated transactivity was determined using the ER luciferase reporter MVLN cell assay. The extracts were tested alone (XER) and together with 17β-estradiol (E2) as a physiological mimic (XERcomp). Dioxins and dioxin-like (DL) compounds were extracted by a combination of SPE...... and the Supelco Dioxin Prep System®. AhR mediated dioxin-like transactivity was determined using the AhR luciferase reporter Hepa 1.12cR cell assay. Agonistic ER transactivity was elicited by 19% of the samples, and a further increased E2 induced ER response was found for 52%, whereas 17% antagonized the E2...... induced ER response. Positive correlations were found in subadult bears between XER and several POP biomarkers. XER and XERcomp correlated positively to each other. A total of 91% of the polar bear blood extracts elicited agonistic AhR transactivity. The AhR-TCDD equivalent (AhR-TEQ) median levels were...

  7. Polar bears experience skeletal muscle atrophy in response to food deprivation and reduced activity in winter and summer

    Science.gov (United States)

    Whiteman, John P.; Harlow, Henry J.; Durner, George M.; Regehr, Eric V.; Rourke, Bryan C.; Robles, Manuel; Amstrup, Steven C.; Ben-David, Merav

    2017-01-01

    When reducing activity and using stored energy during seasonal food shortages, animals risk degradation of skeletal muscles, although some species avoid or minimize the resulting atrophy while experiencing these conditions during hibernation. Polar bears may be food deprived and relatively inactive during winter (when pregnant females hibernate and hunting success declines for other demographic groups) as well as summer (when sea ice retreats from key foraging habitats). We investigated muscle atrophy in samples of biceps femoris collected from free-ranging polar bears in the Southern Beaufort Sea (SBS) throughout their annual cycle. Atrophy was most pronounced in April–May as a result of food deprivation during the previous winter, with muscles exhibiting reduced protein concentration, increased water content, and lower creatine kinase mRNA. These animals increased feeding and activity in spring (when seal prey becomes more available), initiating a period of muscle recovery. During the following ice melt of late summer, ~30% of SBS bears abandon retreating sea ice for land; in August, these ‘shore’ bears exhibited no muscle atrophy, indicating that they had fully recovered from winter food deprivation. These individuals subsequently scavenged whale carcasses deposited by humans and by October, had retained good muscle condition. In contrast, ~70% of SBS bears follow the ice north in late summer, into deep water with less prey. These ‘ice’ bears fast; by October, they exhibited muscle protein loss and rapid changes in myosin heavy-chain isoforms in response to reduced activity. These findings indicate that, unlike other bears during winter hibernation, polar bears without food in summer cannot mitigate atrophy. Consequently, prolonged summer fasting resulting from climate change-induced ice loss creates a risk of greater muscle atrophy and reduced abilities to travel and hunt.

  8. Vibrational characteristics of a superconducting magnetic bearing employed for a prototype polarization modulator

    Science.gov (United States)

    Sakurai, Yuki; Matsumura, Tomotake; Sugai, Hajime; Katayama, Nobuhiko; Ohsaki, Hiroyuki; Terao, Yutaka; Terachi, Yusuke; Kataza, Hirokazu; Utsunomiya, Shin; Yamamoto, Ryo

    2017-07-01

    We present the vibrational characteristics of a levitating rotor in a superconducting magnetic bearing (SMB) system operating at below 10 K. We develop a polarization modulator that requires a continuously rotating optical element, called half-wave plate (HWP), for a cosmic microwave background polarization experiment. The HWP has to operate at the temperature below 10 K, and thus an SMB provides a smooth rotation of the HWP at the cryogenic temperature of about 10 K with minimal heat dissipation. In order to understand the potential interference to the cosmological observations due to the vibration of the HWP, it is essential to characterize the vibrational properties of the levitating rotor of the SMB. We constructed a prototype model that consists of an SMB with an array of high temperature superconductors, YBCO, and a permanent magnet ring, NdFeB. The rotor position is monitored by a laser displacement gauge, and a cryogenic Hall sensor via the magnetic field. In this presentation, we present the measurement results of the vibration characteristics using our prototype SMB system. We characterize the vibrational properties as the spring constant and the damping, and discuss the projected performance of this technology toward the use in future space missions.

  9. 78 FR 11766 - Endangered and Threatened Wildlife and Plants; Special Rule for the Polar Bear Under Section 4(d...

    Science.gov (United States)

    2013-02-20

    ... may include significant habitat modification or degradation where it actually kills or injures... habitat modifications, it requires evidence that the habitat modification or degradation will result in...., aerial surveys, infrared thermal aerial surveys, or polar bear scent-trained dogs) to determine...

  10. Identification of 4-hydroxyheptachlorostyrene in polar bear plasma and its binding affinity to transthyretin : a metabolite of octachlorostyrene?

    NARCIS (Netherlands)

    Standau, C.D.; Meerts, I.A.T.M.; Letcher, R.J.; McAlees, A.J.; Chittim, B.; Brouwer, A.; Norstrom, R.J.

    2000-01-01

    A new compound, 4-hydroxyheptachlorostyrene (4-OH-HpCS), was identified as a major component in the chlorinated phenolic compound fraction of polar bear plasma. The structure was hypothesized to be 4-OH-HpCS based on mass spectral interpretation, the assumption that it was a metabolite of octachloro

  11. Identification of 4-hydroxyheptachlorostyrene in polar bear plasma and its binding affinity to transthyretin : a metabolite of octachlorostyrene?

    NARCIS (Netherlands)

    Standau, C.D.; Meerts, I.A.T.M.; Letcher, R.J.; McAlees, A.J.; Chittim, B.; Brouwer, A.; Norstrom, R.J.

    2000-01-01

    A new compound, 4-hydroxyheptachlorostyrene (4-OH-HpCS), was identified as a major component in the chlorinated phenolic compound fraction of polar bear plasma. The structure was hypothesized to be 4-OH-HpCS based on mass spectral interpretation, the assumption that it was a metabolite of

  12. Environmental chemicals modulate polar bear (Ursus maritimus) peroxisome proliferator-activated receptor gamma (PPARG) and adipogenesis in vitro

    DEFF Research Database (Denmark)

    Routti, Heli; Lille-Langøy, Roger; Berg, Mari K;

    2016-01-01

    and three synthetic mixtures of contaminants in murine 3T3-L1 preadipocytes and polar bear adipose tissue-derived stem cells (pbASCs). PCB153 and p,p'-DDE antagonized pbPPARG, although their predicted receptor-ligand affinity was weak. PBDEs, tetrabromobisphenol A, and PCB170 had a weak agonistic effect...

  13. Dietary habits of polar bears in Foxe Basin, Canada: possible evidence of a trophic regime shift mediated by a new top predator.

    Science.gov (United States)

    Galicia, Melissa P; Thiemann, Gregory W; Dyck, Markus G; Ferguson, Steven H; Higdon, Jeff W

    2016-08-01

    Polar bear (Ursus maritimus) subpopulations in several areas with seasonal sea ice regimes have shown declines in body condition, reproductive rates, or abundance as a result of declining sea ice habitat. In the Foxe Basin region of Nunavut, Canada, the size of the polar bear subpopulation has remained largely stable over the past 20 years, despite concurrent declines in sea ice habitat. We used fatty acid analysis to examine polar bear feeding habits in Foxe Basin and thus potentially identify ecological factors contributing to population stability. Adipose tissue samples were collected from 103 polar bears harvested during 2010-2012. Polar bear diet composition varied spatially within the region with ringed seal (Pusa hispida) comprising the primary prey in northern and southern Foxe Basin, whereas polar bears in Hudson Strait consumed equal proportions of ringed seal and harp seal (Pagophilus groenlandicus). Walrus (Odobenus rosmarus) consumption was highest in northern Foxe Basin, a trend driven by the ability of adult male bears to capture large-bodied prey. Importantly, bowhead whale (Balaena mysticetus) contributed to polar bear diets in all areas and all age and sex classes. Bowhead carcasses resulting from killer whale (Orcinus orca) predation and subsistence harvest potentially provide an important supplementary food source for polar bears during the ice-free period. Our results suggest that the increasing abundance of killer whales and bowhead whales in the region could be indirectly contributing to improved polar bear foraging success despite declining sea ice habitat. However, this indirect interaction between top predators may be temporary if continued sea ice declines eventually severely limit on-ice feeding opportunities for polar bears.

  14. Magnetic polarity ages of the fossil-bearing strata at the Si hetun section, West Liaoning:A preliminary result

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Rock-magnetic and palaeomagnetic studies have been carried out on the interval of famous fossil-bearing sedimentary rocks and its overlying basalts and underlying basalts at the Sihetun section, West Liaoning Province. Normal polarity was obtained for the sedimentary interval and the underlying basalts, while reversed polarity was found in the overlying basalts. Taking account of the new 40Ar/39Ar ages (Swisher et al., 1999), we classified the fossil-bearing sedimentary interval into the Barremian M3n zone (Early Cretaceous age). Several abnormal horizons on magnetic properties, probably corresponding to the tuffs,were observed in the fossil-bearing sedimentary interval.This implies that the massive bio-extinction may link to dramatic environmental changes that were caused by voleanic eruptions.``

  15. Spatial and temporal variation in size of polar bear (Ursus maritimus) sexual organs and its use in pollution and climate change studies.

    Science.gov (United States)

    Sonne, Christian; Dietz, Rune; Born, Erik W; Riget, Frank F; Leifsson, Pall S; Bechshøft, Thea Ø; Kirkegaard, Maja

    2007-11-15

    Sexual organs and their development are susceptible to atmospheric transported environmental xenoendocrine pollutants and climate change (food availability). We therefore investigated sexual organs from 55 male and 44 female East Greenland polar bears (Ursus maritimus) to obtain information about growth/size and sexual maturity. Then, the genitalia size was compared with those previously reported from Canadian and Svalbard polar bears. Growth models showed that East Greenland male polar bears reached sexual maturity around 7 years of age and females around 4 years of age. When comparing East Greenland and Svalbard polar bears, the size of baculum and uterus were significantly lower in the East Greenland polar bears (ANOVA: all p baculum mean values from Canadian polar bears, a similar baculum pattern was found for East Greenland vs. Canadian polar bears. It is speculated whether this could be a result of the general high variation in polar bear body size, temporal distribution patterns of anthropogenic long-range transported persistent organic pollutants or climate change (decreasing food availability). The present investigation represents conservation and background data for future spatial and temporal assessments of hunting, pollution and climate change scenarios.

  16. Prevalence and spatio-temporal variation of an alopecia syndrome in polar bears (Ursus maritimus) of the southern Beaufort Sea

    Science.gov (United States)

    Atwood, Todd C.; Peacock, Elizabeth; Burek, K.A.; Shearn-Bochsler, Valerie I.; Bodenstein, Barbara L.; Beckmen, Kimberlee B.; Durner, George M.

    2015-01-01

    Alopecia (hair loss) has been observed in several marine mammal species and has potential energetic consequences for sustaining a normal core body temperature, especially for Arctic marine mammals routinely exposed to harsh environmental conditions. Polar bears (Ursus maritimus) rely on a thick layer of adipose tissue and a dense pelage to ameliorate convective heat loss while moving between sea ice and open water. From 1998 to 2012, we observed an alopecia syndrome in polar bears from the southern Beaufort Sea of Alaska that presented as bilaterally asymmetrical loss of guard hairs and thinning of the undercoat around the head, neck, and shoulders, which, in severe cases, was accompanied by exudation and crusted skin lesions. Alopecia was observed in 49 (3.45%) of the bears sampled during 1,421 captures, and the apparent prevalence varied by years with peaks occurring in 1999 (16%) and 2012 (28%). The probability that a bear had alopecia was greatest for subadults and for bears captured in the Prudhoe Bay region, and alopecic individuals had a lower body condition score than unaffected individuals. The cause of the syndrome remains unknown and future work should focus on identifying the causative agent and potential effects on population vital rates.

  17. Validation of adipose lipid content as a body condition index for polar bears

    Science.gov (United States)

    McKinney, Melissa A.; Atwood, Todd; Dietz, Rune; Sonne, Christian; Iverson, Sara J.; Peacock, Elizabeth

    2014-01-01

    Body condition is a key indicator of individual and population health. Yet, there is little consensus as to the most appropriate condition index (CI), and most of the currently used CIs have not been thoroughly validated and are logistically challenging. Adipose samples from large datasets of capture biopsied, remote biopsied, and harvested polar bears were used to validate adipose lipid content as a CI via tests of accuracy, precision, sensitivity, biopsy depth, and storage conditions and comparisons to established CIs, to measures of health and to demographic and ecological parameters. The lipid content analyses of even very small biopsy samples were highly accurate and precise, but results were influenced by tissue depth at which the sample was taken. Lipid content of capture biopsies and samples from harvested adult females was correlated with established CIs and/or conformed to expected biological variation and ecological changes. However, lipid content of remote biopsies was lower than capture biopsies and harvested samples, possibly due to lipid loss during dart retrieval. Lipid content CI is a biologically relevant, relatively inexpensive and rapidly assessed CI and can be determined routinely for individuals and populations in order to infer large-scale spatial and long-term temporal trends. As it is possible to collect samples during routine harvesting or remotely using biopsy darts, monitoring and assessment of body condition can be accomplished without capture and handling procedures or noninvasively, which are methods that are preferred by local communities. However, further work is needed to apply the method to remote biopsies.

  18. Single season estimates of polar bear numbers using mark resighting methods: Draft

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Seven-eight bears comprising fifty-two independent groups were marked during the study from 17 March to 28 April. An additional 22 bears were sighted but not marked...

  19. Exposure to mixtures of organohalogen contaminants and associative interactions with thyroid hormones in East Greenland polar bears (Ursus maritimus)

    DEFF Research Database (Denmark)

    Villanger, Gro D.; Jenssen, Bjørn M.; Fjeldberg, Rita R.

    2011-01-01

    We investigated the multivariate relationships between adipose tissue residue levels of 48 individual organohalogen contaminants (OHCs) and circulating thyroid hormone (TH) levels in polar bears (Ursus maritimus) from East Greenland (1999–2001, n=62), using projection to latent structure (PLS...... influenced by biological factors such as age, sex, body size, lipid content of adipose tissue and sampling date. When controlling for biological variables, the major relationships from the PLS models for SubA, AdF_N and AdF_S were found significant in partial correlations. The most important OHCs...... that influenced TH levels in the significant PLS models may potentially act through similar mechanisms on the hypothalamic–pituitary–thyroid (HPT) axis, suggesting that both combined effects by dose and response addition and perhaps synergistic potentiation may be a possibility in these polar bears. Statistical...

  20. Polar bears in the southern Beaufort Sea II: Demography and population growth in relation to sea ice conditions

    Science.gov (United States)

    Hunter, Christine M.; Caswell, Hal; Runge, Michael C.; Regehr, Eric V.; Amstrup, Steven C.; Stirling, Ian

    2007-01-01

    This is a demographic analysis of the southern Beaufort (SB) polar bear population. The analysis uses a female-dominant stage-classified matrix population model in which individuals are classified by age and breeding status. Parameters were estimated from capture-recapture data collected between 2001 and 2006. We focused on measures of long-term population growth rate and on projections of population size over the next 100 years. We obtained these results from both deterministic and stochastic demographic models. Demographic results were related to a measure of sea ice condition, ice(t), defined as the number of ice-free days, in year t, in the region of preferred polar bear habitat. Larger values of ice correspond to lower availability of sea ice and longer ice-free periods. Uncertainty in results was quantified using a parametric bootstrap approach that includes both sampling uncertainty and model selection uncertainty.

  1. Effects of capturing and collaring on polar bears: findings from long-term research on the southern Beaufort Sea population

    Science.gov (United States)

    Rode, Karyn D.; Pagano, Anthony M.; Bromaghin, Jeffrey F.; Atwood, Todd C.; Durner, George M.; Simac, Kristin S.; Amstrup, Steven C.

    2014-01-01

    Context: The potential for research methods to affect wildlife is an increasing concern among both scientists and the public. This topic has a particular urgency for polar bears because additional research is needed to monitor and understand population responses to rapid loss of sea ice habitat.Aims: This study used data collected from polar bears sampled in the Alaska portion of the southern Beaufort Sea to investigate the potential for capture to adversely affect behaviour and vital rates. We evaluated the extent to which capture, collaring and handling may influence activity and movement days to weeks post-capture, and body mass, body condition, reproduction and survival over 6 months or more.Methods: We compared post-capture activity and movement rates, and relationships between prior capture history and body mass, body condition and reproductive success. We also summarised data on capture-related mortality.Key results: Individual-based estimates of activity and movement rates reached near-normal levels within 2–3 days and fully normal levels within 5 days post-capture. Models of activity and movement rates among all bears had poor fit, but suggested potential for prolonged, lower-level rate reductions. Repeated captures was not related to negative effects on body condition, reproduction or cub growth or survival. Capture-related mortality was substantially reduced after 1986, when immobilisation drugs were changed, with only 3 mortalities in 2517 captures from 1987–2013.Conclusions: Polar bears in the southern Beaufort Sea exhibited the greatest reductions in activity and movement rates 3.5 days post-capture. These shorter-term, post-capture effects do not appear to have translated into any long-term effects on body condition, reproduction, or cub survival. Additionally, collaring had no effect on polar bear recovery rates, body condition, reproduction or cub survival.Implications: This study provides empirical evidence that current capture

  2. Patterns of faunal extinction and paleoclimatic change from mid-Holocene mammoth and polar bear remains, Pribilof Islands, Alaska

    Science.gov (United States)

    Veltre, Douglas W.; Yesner, David R.; Crossen, Kristine J.; Graham, Russell W.; Coltrain, Joan B.

    2008-07-01

    Qagnaxˆ Cave, a lava tube cave on St. Paul Island in the Pribilofs, has recently produced a mid-Holocene vertebrate faunal assemblage including woolly mammoth, polar bear, caribou, and Arctic fox. Several dates on the mammoth remains converge on 5700 14C yr BP. These dates, ~ 2300 yr younger than mammoth dates previously published from the Pribilof Islands, make these the youngest remains of proboscideans, and of non-extinct Quaternary megafauna, recovered from North America. Persistence of mammoths on the Pribilofs is most parsimoniously explained by the isolation of the Pribilofs and the lack of human presence in pre-Russian contact times, but an additional factor may have been the local existence of high-quality forage in the form of grasses enriched by nutrients derived from local Holocene tephras. This interpretation is reinforced by stable carbon and nitrogen isotope values obtained from the mammoth remains. The endpoint of mammoth survival in the Pribilofs is unknown, but maybe coterminous with the arrival of polar bears whose remains in the cave date to the Neoglacial cold period of ~ 4500 to 3500 14C yr BP. The polar bear record corroborates a widespread cooling of the Bering Sea region at that time.

  3. The value of a polar bear: evaluating the role of a multiple-use resource in the Nunavut mixed economy.

    Science.gov (United States)

    Dowsley, Martha

    2010-01-01

    The polar bear (Ursus maritimus) is a common pool resource that contributes to both the subsistence and monetary aspects of the Nunavut mixed economy through its use as food, the sale of hides in the fur trade, and sport hunt outfitting. Sport hunting is more financially profitable than subsistence hunting; however, the proportion of the polar bear quota devoted to the sport hunt has become relatively stable at approximately 20% across Nunavut. This ratio suggests local Inuit organizations are not using a neoclassical economic model based on profit maximization. This paper examines local-level hunting organizations and their institutions (as sets of rules) governing the sport and Inuit subsistence hunts from both formalist and substantivist economic perspectives. It concludes that profit maximization is used within the sport hunting sphere, which fits a neoclassical model of economic rationality. A second and parallel system, better viewed through the substantivist perspective, demonstrates that the communities focus on longer-term goals to maintain and reproduce the socio-economic system of the subsistence economy, which is predicated on maintaining social, human-environment, and human-polar bear relations.

  4. Are liver and renal lesions in East Greenland polar bears (Ursus maritimus associated with high mercury levels?

    Directory of Open Access Journals (Sweden)

    Born Erik W

    2007-04-01

    Full Text Available Abstract Background In the Arctic, polar bears (Ursus maritimus bio-accumulate mercury as they prey on polluted ringed seals (Phoca hispida and bearded seals (Erignathus barbatus. Studies have shown that polar bears from East Greenland are among the most mercury polluted species in the Arctic. It is unknown whether these levels are toxic to liver and kidney tissue. Methods We investigated the histopathological impact from anthropogenic long-range transported mercury on East Greenland polar bear liver (n = 59 and kidney (n = 57 tissues. Results Liver mercury levels ranged from 1.1–35.6 μg/g wet weight and renal levels ranged from 1–50 μg/g wet weight, of which 2 liver values and 9 kidney values were above known toxic threshold level of 30 μg/g wet weight in terrestrial mammals. Evaluated from age-correcting ANCOVA analyses, liver mercury levels were significantly higher in individuals with visible Ito cells (p Conclusion Based on these relationships and the nature of the chronic inflammation we conclude that the lesions were likely a result of recurrent infections and ageing but that long-term exposure to mercury could not be excluded as a co-factor. The information is important as it is likely that tropospheric mercury depletion events will continue to increase the concentrations of this toxic heavy metal in the Sub Arctic and Arctic marine food webs.

  5. Effects of polar bear and killer whale derived contaminant cocktails on marine mammal immunity.

    Science.gov (United States)

    Desforges, Jean-Pierre; Levin, Milton; Jasperse, Lindsay; De Guise, Sylvain; Eulaers, Igor; Letcher, Robert J; Acquarone, Mario; Nordoy, Erling; Folkow, Lars; Hammer Jensen, Trine; Grondahl, Carsten; Bertelsen, Mads F; St Leger, Judy; Almunia, Javier; Sonne, Christian; Dietz, Rune

    2017-09-06

    Most controlled toxicity studies use single chemical exposures that do not represent the real world situation of complex mixtures of known and unknown natural and anthropogenic substances. In the present study, complex contaminant cocktails derived from the blubber of polar bears (PB; Ursus maritimus) and killer whales (KW; Orcinus orca) were used for in vitro concentration-response experiments with PB, cetacean and seal spp. immune cells to evaluate the effect of realistic contaminant mixtures on various immune functions. Cytotoxic effects of the PB cocktail occurred at lower concentrations than the KW cocktail (1 vs 16 µg/ml), likely due to differences in contaminant profiles in the mixtures derived from the adipose of each species. Similarly, significant reduction of lymphocyte proliferation occured at much lower exposures in the PB cocktail (EC50: 0.94 vs 6.06 µg/ml; P < 0.01), while the KW cocktail caused a much faster decline in proliferation (slope: 2.9 vs 1.7; P = 0.04). Only the KW cocktail modulated natural killer (NK) cell activity and neutrophil and monocyte phagocytosis in a concentration- and species-dependent manner. No clear sensitivity differences emerged when comparing cetaceans, seals and PB. Our results showing lower effect levels for complex mixtures relative to single compounds suggest that previous risk assessments underestimate the effects of real world contaminant exposure on immunity. Our results using blubber-derived contaminant cocktails add realism to in vitro exposure experiments and confirm the immunotoxic risk marine mammals face from exposure to complex mixtures of environmental contaminants.

  6. Performance and retention of lightweight satellite radio tags applied to the ears of polar bears (Ursus maritimus)

    Science.gov (United States)

    Wiig, Øystein; Born, Erik W.; Laidre, Kristin L.; Dietz, Rune; Jensen, Mikkel Villum; Durner, George M.; Pagano, Anthony M.; Regehr, Eric V.; St. Martin, Michelle; Atkinson, Stephen N.; Dyck, Markus

    2017-01-01

    BackgroundSatellite telemetry studies provide information that is critical to the conservation and management of species affected by ecological change. Here we report on the performance and retention of two types (SPOT-227 and SPOT-305A) of ear-mounted Argos-linked satellite transmitters (i.e., platform transmitter terminal, or PTT) deployed on free-ranging polar bears in Eastern Greenland, Baffin Bay, Kane Basin, the southern Beaufort Sea, and the Chukchi Sea during 2007–2013.ResultsTransmissions from 142 out of 145 PTTs deployed on polar bears were received for an average of 69.3 days. The average functional longevity, defined as the number of days they transmitted while still attached to polar bears, for SPOT-227 was 56.8 days and for SPOT-305A was 48.6 days. Thirty-four of the 142 (24%) PTTs showed signs of being detached before they stopped transmitting, indicating that tag loss was an important aspect of tag failure. Furthermore, 10 of 26 (38%) bears that were re-observed following application of a PTT had a split ear pinna, suggesting that some transmitters were detached by force. All six PTTs that were still on bears upon recapture had lost the antenna, which indicates that antenna breakage was a significant contributor to PTT failure. Finally, only nine of the 142 (6%) PTTs—three of which were still attached to bears—had a final voltage reading close to the value indicating battery exhaustion. This suggests that battery exhaustion was not a major factor in tag performance.ConclusionsThe average functional longevity of approximately 2 months for ear-mounted PTTs (this study) is poor compared to PTT collars fitted to adult female polar bears, which can last for several years. Early failure of the ear-mounted PTTs appeared to be caused primarily by detachment from the ear or antenna breakage. We suggest that much smaller and lighter ear-mounted transmitters are necessary to reduce the risk of tissue irritation, tissue damage, and tag detachment, and

  7. Den unge Heidegger

    DEFF Research Database (Denmark)

    Den første antologi på dansk om den unge Heideggers skrifter og udviklingen før Væren og tid......Den første antologi på dansk om den unge Heideggers skrifter og udviklingen før Væren og tid...

  8. Den performative by

    DEFF Research Database (Denmark)

    Samson, Kristine

    2012-01-01

    Den performative by omhandler den æstetiske og affektive drejning, der finder sted inden for kulturel byudvikling i øjeblikket......Den performative by omhandler den æstetiske og affektive drejning, der finder sted inden for kulturel byudvikling i øjeblikket...

  9. Den gode argumentations anatomi

    DEFF Research Database (Denmark)

    Kock, Christian Erik J

    2013-01-01

    God argumentation har tre dimensioner: Den er faktuelt retvisende, den er relevant, og den er vægtig. Desværre slipper politikerne ofte af sted med mangelfuld argumentation fordi de forklæder den godt. Derfor får du her de vigtigste redskaber til at spotte uskikkene i politisk argumentation...

  10. Den gode argumentations anatomi

    DEFF Research Database (Denmark)

    Kock, Christian Erik J

    2013-01-01

    God argumentation har tre dimensioner: Den er faktuelt retvisende, den er relevant, og den er vægtig. Desværre slipper politikerne ofte af sted med mangelfuld argumentation fordi de forklæder den godt. Derfor får du her de vigtigste redskaber til at spotte uskikkene i politisk argumentation...

  11. U.S. Geological Survey Polar Bear Mark-Recapture Records, Alaska Portion of the Southern Beaufort Sea, 2001-2010

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — These data were collected by the U.S. Geological Survey, Alaska Science Center, Polar Bear Research Program as part of long-term research on the southern Beaufort...

  12. Summer Activity Sensor Data from Collars Deployed on Female Polar Bears in the Chukchi Sea 1989 to 1995 and Southern Beaufort Sea 1989 to 2014

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — These are data collected from two types of activity sensors housed within collars deployed on female polar bears in the Chukchi and southern Beaufort Seas during the...

  13. Brain region-specific perfluoroalkylated sulfonate (PFSA) and carboxylic acid (PFCA) accumulation and neurochemical biomarker Responses in east Greenland polar Bears (Ursus maritimus)

    DEFF Research Database (Denmark)

    Pedersen, Kathrine Eggers; Basu, Niladri; Letcher, Robert

    2015-01-01

    to bioaccumulate in lipid rich tissues of the brain among other tissues such as liver, and can reach high concentrations in top predators including the polar bear. PFCA and PFSA bioaccummulation in the brain has the potential to pose neurotoxic effects and therefore we conducted a study to investigate...... if variations in neurochemical transmitter systems i.e. the cholinergic, glutaminergic, dopaminergic and GABAergic, could be related to brain-specific bioaccumulation of PFASs in East Greenland polar bears. Nine brain regions from nine polar bears were analyzed for enzyme activity (monoamine oxidase (MAO...... regions, whereas GS activity was positively correlated with PFASs primarily in occipital lobe. Results from the present study support the hypothesis that PFAS concentrations in polar bears from East Greenland have exceeded the threshold limits for neurochemical alterations. It is not known whether...

  14. Environmental assessment, proposal by the U.S. Fish and Wildlife Service to develop reporting and sealing regulations for harvested walrus, polar bear, and sea otter

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The Fish and Wildlife Service proposes reporting and sealing regulations for the Native take of walrus, polar bear, and sea otter by amending 50 CFR Part 18.23. The...

  15. The Energetic Value of Land-Based Foods in Western Hudson Bay and Their Potential to Alleviate Energy Deficits of Starving Adult Male Polar Bears.

    Directory of Open Access Journals (Sweden)

    Linda J Gormezano

    Full Text Available Climate change is predicted to expand the ice-free season in western Hudson Bay and when it grows to 180 days, 28-48% of adult male polar bears are projected to starve unless nutritional deficits can be offset by foods consumed on land. We updated a dynamic energy budget model developed by Molnar et al. to allow influx of additional energy from novel terrestrial foods (lesser snow geese, eggs, caribou that polar bears currently consume as part of a mixed diet while on land. We calculated the units of each prey, alone and in combination, needed to alleviate these lethal energy deficits under conditions of resting or limited movement (2 km d-1 prior to starvation. We further considered the total energy available from each sex and age class of each animal prey over the period they would overlap land-bound polar bears and calculated the maximum number of starving adult males that could be sustained on each food during the ice-free season. Our results suggest that the net energy from land-based food, after subtracting costs of limited movement to obtain it, could eliminate all projected nutritional deficits of starving adult male polar bears and likely other demographic groups as well. The hunting tactics employed, success rates as well as behavior and abundance of each prey will determine the realized energetic values for individual polar bears. Although climate change may cause a phenological mismatch between polar bears and their historical ice-based prey, it may simultaneously yield a new match with certain land-based foods. If polar bears can transition their foraging behavior to effectively exploit these resources, predictions for starvation-related mortality may be overestimated for western Hudson Bay. We also discuss potential complications with stable-carbon isotope studies to evaluate utilization of land-based foods by polar bears including metabolic effects of capture-related stress and consuming a mixed diet.

  16. Regional contamination versus regional dietary differences: Understanding geographic variation in brominated and chlorinated contaminant levels in polar bears

    Science.gov (United States)

    McKinney, M.A.; Letcher, R.J.; Aars, J.; Born, E.W.; Branigan, M.; Dietz, R.; Evans, T.J.; Gabrielsen, G.W.; Muir, D.C.G.; Peacock, E.; Sonne, C.

    2011-01-01

    The relative contribution of regional contamination versus dietary differences to geographic variation in polar bear (Ursus maritimus) contaminant levels is unknown. Dietary variation between Alaska Canada, East Greenland, and Svalbard subpopulations was assessed by muscle nitrogen and carbon stable isotope (?? 15N, ?? 13C) and adipose fatty acid (FA) signatures relative to their main prey (ringed seals). Western and southern Hudson Bay signatures were characterized by depleted ?? 15N and ??13C, lower proportions of C20 and C22 monounsaturated FAs and higher proportions of C18 and longer chain polyunsaturated FAs. East Greenland and Svalbard signatures were reversed relative to Hudson Bay. Alaskan ?? 2011 American Chemical Society.

  17. Polar bear encephalitis: establishment of a comprehensive next-generation pathogen analysis pipeline for captive and free-living wildlife.

    Science.gov (United States)

    Szentiks, C A; Tsangaras, K; Abendroth, B; Scheuch, M; Stenglein, M D; Wohlsein, P; Heeger, F; Höveler, R; Chen, W; Sun, W; Damiani, A; Nikolin, V; Gruber, A D; Grobbel, M; Kalthoff, D; Höper, D; Czirják, G Á; Derisi, J; Mazzoni, C J; Schüle, A; Aue, A; East, M L; Hofer, H; Beer, M; Osterrieder, N; Greenwood, A D

    2014-05-01

    This report describes three possibly related incidences of encephalitis, two of them lethal, in captive polar bears (Ursus maritimus). Standard diagnostic methods failed to identify pathogens in any of these cases. A comprehensive, three-stage diagnostic 'pipeline' employing both standard serological methods and new DNA microarray and next generation sequencing-based diagnostics was developed, in part as a consequence of this initial failure. This pipeline approach illustrates the strengths, weaknesses and limitations of these tools in determining pathogen caused deaths in non-model organisms such as wildlife species and why the use of a limited number of diagnostic tools may fail to uncover important wildlife pathogens.

  18. Longer ice-free seasons increase the risk of nest depredation by polar bears for colonial breeding birds in the Canadian Arctic.

    Science.gov (United States)

    Iverson, Samuel A; Gilchrist, H Grant; Smith, Paul A; Gaston, Anthony J; Forbes, Mark R

    2014-03-22

    Northern polar regions have warmed more than other parts of the globe potentially amplifying the effects of climate change on biological communities. Ice-free seasons are becoming longer in many areas, which has reduced the time available to polar bears (Ursus maritimus) to hunt for seals and hampered bears' ability to meet their energetic demands. In this study, we examined polar bears' use of an ancillary prey resource, eggs of colonial nesting birds, in relation to diminishing sea ice coverage in a low latitude region of the Canadian Arctic. Long-term monitoring reveals that bear incursions onto common eider (Somateria mollissima) and thick-billed murre (Uria lomvia) nesting colonies have increased greater than sevenfold since the 1980s and that there is an inverse correlation between ice season length and bear presence. In surveys encompassing more than 1000 km of coastline during years of record low ice coverage (2010-2012), we encountered bears or bear sign on 34% of eider colonies and estimated greater egg loss as a consequence of depredation by bears than by more customary nest predators, such as foxes and gulls. Our findings demonstrate how changes in abiotic conditions caused by climate change have altered predator-prey dynamics and are leading to cascading ecological impacts in Arctic ecosystems.

  19. Collectie Van den Bree

    NARCIS (Netherlands)

    Voerman, Gerrit; van den Bree, R.A.P.; Koole, Ruud

    1988-01-01

    Plaatsingslijst behorende bij het persoonlijke archief van R.A.P. van den Bree, betrekking hebbende op de Evangelische Volkspartij {EVP) (1979-1986), opgesteld door R.A.P. van den Bree en G. Voerman, 1987

  20. Idealismen og dens kritikere

    DEFF Research Database (Denmark)

    Huggler, Jørgen

    2006-01-01

    En idéhistorisk redegørelse for filosofien i tiden mellem 1789 og 1857 - med hovedvægt på kritikken af den franske revolution, den tyske idealisme (Fichte, Schelling, Hegel) samt positivismen i Frankrig.......En idéhistorisk redegørelse for filosofien i tiden mellem 1789 og 1857 - med hovedvægt på kritikken af den franske revolution, den tyske idealisme (Fichte, Schelling, Hegel) samt positivismen i Frankrig....

  1. Den canadiske model

    DEFF Research Database (Denmark)

    Böss, Michael

    2009-01-01

    Det har altid været en amerikansk fordom, at Canada er et kedeligt land. Men i lyset af den finansielle krise, er den fordom sværere at holde fast i. Nabolandet mod nord, hvor hverken socialisme eller radikal liberalisme har nydt stor udbredelse, og hvor den finansielle sektor i lang tid har være...

  2. dens psykologi

    DEFF Research Database (Denmark)

    Sørensen, Mariann B.

    2011-01-01

    I kapitlet beskrives psykologiens forhold til og behandling af døden. Der er fokus på en psykoanalytisk og en eksistentialistisk tilgang. Den klassiske teori om dødens forløb repræsenteret af Elisabeth Kübler-Ross diskuteres i lyset af nyere teorier som Terror Management Theory og Meaning Managem...

  3. Legacy and new halogenated persistent organic pollutants in polar bears from a contamination hotspot in the Arctic, Hudson Bay Canada.

    Science.gov (United States)

    Letcher, R J; Morris, A D; Dyck, M; Sverko, E; Reiner, E J; Blair, D A D; Chu, S G; Shen, L

    2017-08-10

    A large and complex suite of 295 legacy and new halogenated persistent organic pollutants (POPs) were investigated in fat or liver tissue samples of polar bears collected in 2013-2014 from Southern (SHB) and Western (WHB) subpopulations of the Canadian Arctic contaminants hotspot of Hudson Bay. A total of 210 POPs were detected and/or quantifiable with some frequency in all fat or liver samples. POP profile and concentration differences were investigated both within (e.g. age and sex) and between the two subpopulations. Two time-point comparisons were made relative to POPs reported for Hudson Bay polar bears harvested in 2007-2008. ΣPolychlorinated biphenyl (PCB) concentrations at both time points were the most concentrated of the POP groups, and were spatially uniform with no detectable influence of sex or age, as were concentrations of the dominant congener CB153. ΣChlordanes (ΣCHLs, 74-79% oxychlordane) and the Σperfluoroalkyl substances (ΣPFASs, ≈60% perfluorooctane sulfonate (PFOS)) had the second greatest POP group concentrations in SHB and WHB respectively, with ΣPFASs and ΣCHLs being significantly influenced by age and/or sex. ΣCHLs were spatially uniform but ΣPFASs were greater in the SHB bears, as were e.g. some flame retardants, due to e.g. local contamination and/or changes in bear behavior and diet. Endosulfans and hexabromocyclododecane were detectable in samples from 2007-2008 but not from 2013-2014, which is consistent with their global POP regulations. ΣPolychlorinated naphthalenes (ΣPCNs) were consistently detected at relatively high concentrations compared to other arctic wildlife, however these concentrations were low relative to legacy POPs. ΣShort-chain chlorinated paraffins (ΣSCCPs) were major contributors to the overall POPs burden with concentrations comparable to other legacy POPs, though there was no significant difference between or within subpopulations for PCNs or SCCPs. Except for octachlorostyrene, POPs concentrations

  4. Consequences of long-distance swimming and travel over deep-water pack ice for a female polar bear during a year of extreme sea ice retreat

    Science.gov (United States)

    Durner, G.M.; Whiteman, J.P.; Harlow, H.J.; Amstrup, Steven C.; Regehr, E.V.; Ben-David, M.

    2011-01-01

    Polar bears (Ursus maritimus) prefer to live on Arctic sea ice but may swim between ice floes or between sea ice and land. Although anecdotal observations suggest that polar bears are capable of swimming long distances, no data have been available to describe in detail long distance swimming events or the physiological and reproductive consequences of such behavior. Between an initial capture in late August and a recapture in late October 2008, a radio-collared adult female polar bear in the Beaufort Sea made a continuous swim of 687 km over 9 days and then intermittently swam and walked on the sea ice surface an additional 1,800 km. Measures of movement rate, hourly activity, and subcutaneous and external temperature revealed distinct profiles of swimming and walking. Between captures, this polar bear lost 22% of her body mass and her yearling cub. The extraordinary long distance swimming ability of polar bears, which we confirm here, may help them cope with reduced Arctic sea ice. Our observation, however, indicates that long distance swimming in Arctic waters, and travel over deep water pack ice, may result in high energetic costs and compromise reproductive fitness. ?? 2011 US Government.

  5. Den kommunikerende organisation

    DEFF Research Database (Denmark)

    Tække, Jesper

    2006-01-01

    samtidig tilbydes optimale muligheder for at få opfyldt individuelle behov og karrieremuligheder. For at en organisation skal kunne korrigere sig i forhold til de krav den konfronteres med, må der kunne fremstilles et adækvat billede af den. Det vil sige at dens faktiske kommunikationsprocesser må kunne...... drages frem i lyset på en måde så hensigtsmæssigheder og uhensigtsmæssigheder kan iagttages og selv blive objekt for reflekteret organisationskommunikation. Dette paper giver et udkast til en analysestrategi, hvormed der kan tegnes et billede af den enkelte organisation ud fra hvordan dens enkelte og...

  6. Polar Bears or People? Exploring Ways in Which Teachers Frame Climate Change in the Classroom

    Science.gov (United States)

    Busch, K. C.

    2016-01-01

    Not only will young adults bear the brunt of the effects of climate change, but they are also the ones who will be required to take action-to mitigate and to adapt. Framing, as both a theory and an analytic method, has been used to understand how language in the media can affect the audience's concern and intention to act. The theory and the…

  7. Vitamins A and E in liver, kidney, and whole blood of East Greenland polar bears sampled 1994–2008: reference values and temporal trends

    DEFF Research Database (Denmark)

    Bechshoft, T.; Sonne, C.; Jakobsen, Jette;

    2015-01-01

    Vitamins A (retinol) and E (α-tocopherol) are dietary vitamins, essential for, e.g., growth and development, reproduction, and immune function. Persistent organic pollutants (POPs) have been found to be related to vitamin A and E metabolism. However, few investigations have been published...... on this health issue in polar bears (Ursus maritimus). The aim of this study was thus to provide reference values for concentrations of vitamin A in liver, kidney cortex, and whole blood and vitamin E in kidney cortex and whole blood from 166 East Greenland polar bears, as well as to assess the relationship...... between POPs and vitamin concentrations. In addition, vitamin concentrations were analyzed for temporal trends (1994–2008). Results showed vitamin A in liver to be higher in adult bears and the concentrations of vitamin E in kidney and blood to likewise be generally higher in adult bears. In addition, all...

  8. Polyhalogenated compounds (PCBs, chlordanes, HCB and BFRs) in four polar bears (Ursus maritimus) that swam malnourished from East Greenland to Iceland.

    Science.gov (United States)

    Vetter, Walter; Gall, Vanessa; Skírnisson, Karl

    2015-11-15

    Levels of organohalogen compounds (PCBs, chlordane, PBB 153, PBDEs, HCB) were determined in adipose tissue, liver, kidney and muscle of four polar bears which swam and/or drifted to Iceland in extremely malnourished condition. Since the colonization in the 9th century polar bears have been repeatedly observed in Iceland. However, in recent years three of the animals have clearly left their natural habitat in poor condition in May or June, i.e. at the end of the major feeding season. The fourth bear is believed to have drifted with melting ice to North-Eastern Iceland in mid-winter. The concentrations of the POPs were within the range or higher than the typical concentrations measured in polar bears from the East Greenland population. In addition to the targeted compounds, we tentatively detected Dechlorane 602 and its potential hydrodechlorinated Cl11-metabolite in all samples. Moreover, a polychlorinated compound which partly co-eluted with PCB 209 was detected in all liver samples but not in adipose tissue, kidney or muscle. The mass spectrum of the potential metabolite did not allow determining its structure. Polar bears are good swimmers and can reach Iceland from the ice edge of East Greenland within a few days. Potential reasons for the swims are briefly discussed.

  9. Images of Polar Bears and Penguins, Storms, Deforestation and More - Middle School Students Perceptions of Climate Change

    Science.gov (United States)

    Gopal, S.; Melaas, E. K.; Malmrose, M.; Mullokandov, A.

    2014-12-01

    Global change studies aim to foster a deeper understanding of the causes and consequences of global change on planet Earth. The study of global change presents a rich domain of inquiry, exploration, and discovery at all grade levels. The main objective of this exploratory study was to assess middle school students' perceptions of global change as part of their participation in the NSF GK12 program called GLACIER (Global Change Initiative - Education and Research) during the academic year 2012-13. The middle schools are located in the Metro Boston area. As part of the program, participating students were asked to draw pictures of their perceptions and ideas on global change. The drawings of 150 children, ages 11 to 13, were qualitatively analyzed. The analysis focused on (a) the type of concepts children chose to convey, (b) the specific context of the global change described (polar bears in floating glaciers), (c) students direct representation of anthropocentric impacts (such as pollution or deforestation), and (d) the match between students concepts and the recent IPCC reports. About 20% of the students focused on the iconic imagery of the melting glaciers and impact on animals such as penguins and polar bears, more than 25% focused on natural disasters (such as storms, sea level changes) while 30% focused on urban problems. These concepts are matched with the recent IPCC report. These results are notable and suggest students in middle schools understand the varied dimensions of global change and the role of human activities in bringing about change. Students' perspectives may help in developing a suitable curriculum using existing science standards to discuss this significant topic in middle school classrooms. In addition, students' drawings illustrate their perception of the coupled human and natural systems.

  10. Den moderne patient

    DEFF Research Database (Denmark)

    Lassen, Trine

    2012-01-01

    Kapitlet indkredser, hvordan vi som sundhedsprofessionelle kan forklare den moderne patient. I særdeleshed lægges vægt på definerende faktorer i skabelsen af den patient vi møder i sundhedsvæsnet i dag. Kapitlet giver forskellige teoretiske bud på, hvordan man som sundhedsprofessionel kan anskue...... den moderne, nutidige patienter samt en kortere beskrivelse af, hvordan patienten tidligere er blev anskuet....

  11. "Den onde kvinde"

    DEFF Research Database (Denmark)

    Holst, Søren

    2002-01-01

    Et af Dødehavsskrifterne, af den første udgiver kaldet "Den onde kvindes rænker" (4Q184), beskriver en svigefuld kvinde, der lokker fromme mænd i fordærv. Artiklen gennemgår tekstens fortolkningshistorie og påviser den rolle, det har spillet for læsningen, at teksten a priori er blevet opfattet s...

  12. Den situationsbestemte bolig

    DEFF Research Database (Denmark)

    Duelund Mortensen, Peder

    2010-01-01

    Boligen er en del af vores forbrugsmønster, mere og mere uforudsigeligt og præget af tilfældigheder, stemninger og den situation, den enkelte befinder sig i. Dette stiller forskellige krav til den samme bolig, krav om individuel fortolkning, fleksibilitet og åbne anvendelsesmuligheder. Ud fra ana...... analyser af boliger i Pærehaven og VM-huset karakteriseres boligen som et dynamisk projekt rettet mod opbygning af identitet og arkitektonisk kvalitet....

  13. Den inkluderende skole

    DEFF Research Database (Denmark)

    Hedegaard Hansen, Janne

    2009-01-01

    Artiklen tager afsæt i en forståelse af inklusion som den enkelte elevs ret til deltagelse i de eksisterende fællesskaber, forstået som de læringsrum, der bedst muligt tilgodeser den enkelte elevs særlige behov. I artiklen diskuteres hvilke nødvendige forandringer det fordrer i den pædagogiske pr...

  14. Den Danske Regnskabsordbog

    DEFF Research Database (Denmark)

    Nielsen, Sandro; Mourier, Lise; Bergenholtz, Henning

    Den Danske Regnskabsordbog har 4.100 opslagsord og ca. 15.000 ordforbindelser. Ordbøgerne bygger primært på den gældende danske årsregnskabslov, danske regnskabsvejledninger og internationale regnskabsstandarder (IAS/IFRS).......Den Danske Regnskabsordbog har 4.100 opslagsord og ca. 15.000 ordforbindelser. Ordbøgerne bygger primært på den gældende danske årsregnskabslov, danske regnskabsvejledninger og internationale regnskabsstandarder (IAS/IFRS)....

  15. Den store skandinaviske redningsaktion

    DEFF Research Database (Denmark)

    Christensen, Claus Bundgård

    2015-01-01

    Historikeren Bo Lidegaard fortæller flot den store historie om den forbløffende og komplicerede skandinaviske redning af fanger fra Hitlers koncentrationslejre. En historie, der samtidig berører alvorlige moralske spørgsmål.......Historikeren Bo Lidegaard fortæller flot den store historie om den forbløffende og komplicerede skandinaviske redning af fanger fra Hitlers koncentrationslejre. En historie, der samtidig berører alvorlige moralske spørgsmål....

  16. Den Danske Regnskabsordbog

    DEFF Research Database (Denmark)

    Nielsen, Sandro; Mourier, Lise; Bergenholtz, Henning

    Den Danske Regnskabsordbog har 4.100 opslagsord og ca. 15.000 ordforbindelser. Ordbøgerne bygger primært på den gældende danske årsregnskabslov, danske regnskabsvejledninger og internationale regnskabsstandarder (IAS/IFRS).......Den Danske Regnskabsordbog har 4.100 opslagsord og ca. 15.000 ordforbindelser. Ordbøgerne bygger primært på den gældende danske årsregnskabslov, danske regnskabsvejledninger og internationale regnskabsstandarder (IAS/IFRS)....

  17. Is bone mineral composition disrupted by organochlorines in east Greenland polar bears (Ursus maritimus)?

    DEFF Research Database (Denmark)

    Sonne, Christian; Dietz, Rune; Born, Erik W;

    2004-01-01

    ), dichlorodiphenyl trichloroethane (DDT) and its metabolites, chlordanes (CHLs), dieldrin, hexacyclohexanes, hexachlorobenzene] and polybrominated diphenyl ether (PBDE) compounds. To ensure that the BMD value in skull represented the mineral status of the skeletal system in general, we compared BMD values in femur...... and three lumbar vertebrae with skull in a subsample. We detected highly significant correlations between BMD in skull and femur (r = 0.99; p PBDE period (1892.......04) and SigmaCHL (p PBDE in subadults were also found (p = 0.06). In conclusion, the strong correlative relationships suggest that disruption of the bone mineral composition in East Greenland polar...

  18. Reproductive performance in East Greenland polar bears (Ursus maritimus) may be affected by organohalogen contaminants as shown by physiologically-based pharmacokinetic (PBPK) modelling

    DEFF Research Database (Denmark)

    Sonne, Christian; Gustavson, Kim; Rigét, Frank F.

    2009-01-01

    and for dieldrin (range: 43–640 ng g−1 lw), PCBs (range: 3491–13 243 ng g−1 lw) and PFOS (range: 1332–6160 ng g−1 ww) in the year 2006. The concentrations of oxychlordane, DDTs, HCB and HCHs in polar bears resulted in RQs

  19. Den lille levnedsmiddeltabel

    DEFF Research Database (Denmark)

    Saxholt, Erling; Fagt, Sisse; Matthiessen, Jeppe;

    Den lille levnedsmiddeltabel er en oversigt over indholdet af næringsstoffer i næsten 600 af de mest anvendte fødevarer i den danske kost. Herudover rummer bogen anvisninger til anvendelsen af fødevaredata....

  20. Den ideelle leder

    DEFF Research Database (Denmark)

    Holmgreen, Lise-Lotte

    2013-01-01

    af jobannoncer for lederstillinger på de danske jobportaler Stepstone og Job Index indikerer, at den første type er den, der oftest bliver efterspurgt blandt danske virksomheder (Holmgreen, i proces). Med udgangspunkt i begrebet framing (Evans & Green 2006; Fillmore 1982; Kövecses 2006; Lakoff 1987...

  1. Den Akutte Patient

    DEFF Research Database (Denmark)

    Graumann, Ole; Laursen, Christian B.

    2016-01-01

    Kapitlet indledes med en generel introduktion til de mest almindelige former for PoC-billeddiagnostik, hvor klinikeren i en akutmodtageafdeling selv varetager den initiale tolkning. Der fokuseres på de billeddiagnostiske undersøgelser, der kan og skal ske i den akutte modtageafdeling, og begrebet...

  2. Dens in Dente

    Directory of Open Access Journals (Sweden)

    Anita Balan

    2006-01-01

    Full Text Available Dens in dente are developmental malformation resulting from invagination of the crown before it is calcified. This anomaly is most frequently found in the permanent maxillary lateral incisor. Three cases, one of radicular and two of coronal dens in dente are reported.

  3. Den Legende Organisation

    DEFF Research Database (Denmark)

    Thorsted, Ann Charlotte

    Bogen beskriver, hvordan to vidt forskellige organisationer - den store internationale virksomhed LEGO og den mindre nonprofit organisation SUS - har bragt legen i spil. Ann Charlotte Thorsted viser i bogen, hvordan leg kan understøtte innovation, læring, kommunikation, samarbejde og det gode arb...

  4. Den levende sangfugl

    DEFF Research Database (Denmark)

    Bjerre, Thomas Ærvold

    2009-01-01

    Kronik om Harper Lee's roman "Dræb ikke en sangfugl" (1960) og den store indflydelse bog og film har haft på amerikansk kultur. Udgivelsesdato: 30. juli......Kronik om Harper Lee's roman "Dræb ikke en sangfugl" (1960) og den store indflydelse bog og film har haft på amerikansk kultur. Udgivelsesdato: 30. juli...

  5. Den ideelle leder

    DEFF Research Database (Denmark)

    Holmgreen, Lise-Lotte

    2013-01-01

    af jobannoncer for lederstillinger på de danske jobportaler Stepstone og Job Index indikerer, at den første type er den, der oftest bliver efterspurgt blandt danske virksomheder (Holmgreen, i proces). Med udgangspunkt i begrebet framing (Evans & Green 2006; Fillmore 1982; Kövecses 2006; Lakoff 1987...

  6. Den historiske krimi

    DEFF Research Database (Denmark)

    Agger, Gunhild

    2014-01-01

    Rent kvantitativt har den historiske og samtidshistoriske krimi ekspanderet voldsomt siden 1980’erne – også i Norden. Det er sket i forskellige medier, men mest fremtrædende i romanform. En historisk krimi er helt grundlæggende et værk, der kombinerer to genrer – krimien og den historiske roman. ...

  7. Den lille levnedsmiddeltabel

    DEFF Research Database (Denmark)

    Saxholt, Erling; Fagt, Sisse; Matthiessen, Jeppe

    Den lille levnedsmiddeltabel er en oversigt over indholdet af næringsstoffer i næsten 600 af de mest anvendte fødevarer i den danske kost. Herudover rummer bogen anvisninger til anvendelsen af fødevaredata....

  8. Den moderate revolution

    DEFF Research Database (Denmark)

    Larsen, Bøje

    "normale" industrivirksomheder, men den er absolut set begrænset. Årsagerne til denne kun "moderate revolution" af organisationsformerne diskuteres: Er det fordi klassisk organisation og social nærkontakt er nødvendig i den nye økonomi, eller er det manglende fantasi og tryghedsbehov? Begge muligheder...

  9. Den positive psykologis metoder

    DEFF Research Database (Denmark)

    Andersen, Frans Ørsted; Mørck, Line Lerche; Nissen, Poul Erik

    En antologi der giver en introduktion til en række af de metoder der anvendes til forskning, assessment, test, udviklingsarbejde og intervention indenfor den positive psykologi.......En antologi der giver en introduktion til en række af de metoder der anvendes til forskning, assessment, test, udviklingsarbejde og intervention indenfor den positive psykologi....

  10. Den kinesiske krimi

    DEFF Research Database (Denmark)

    Hansen, Kim Toft

    oversætter orientalisten Robert van Gulik den overleverede kinesiske fortælling De goong an til engelsk – som The Celebrated Cases of Judge Dee – og er dermed en central aktør i importen af den kinesiske krimi til vesten. Gulik stopper dog ikke her, men fortsætter sin fascination af karakteren Dommer Dee, og...... skriver derfor en række romaner, der foregår på det tidspunkt, som den biografiske Dee skal have levet. Gulik både oversætter, importerer og adapterer på den måde den kinesiske krimi. Dette paper sætter fokus på forskelle og ligheder på vestlig og kinesisk krimi – med særligt fokus på Dee goong...

  11. Morbillivirus and Toxoplasma exposure and association with hematological parameters for southern Beaufort Sea polar bears: potential response to infectious agents in a sentinel species

    Science.gov (United States)

    Kirk, Cassandra M.; Amstrup, Steven C.; Swor, Rhonda; Holcomb, Darce; O'Hara, Todd M.

    2010-01-01

    Arctic temperatures are increasing in response to greenhouse gas forcing and polar bears have already responded to changing conditions. Declines in body stature and vital rates have been linked to warming-induced loss of sea-ice. As food webs change and human activities respond to a milder Arctic, exposure of polar bears and other arctic marine organisms to infectious agents may increase. Because of the polar bear’s status as arctic ecosystem sentinel, polar bear health could provide an index of changing pathogen occurrence throughout the Arctic, however, exposure and monitoring protocols have yet to be established. We examine prevalence of antibodies to Toxoplasma gondii, and four morbilliviruses (canine distemper [CDV], phocine distemper [PDV], dolphin morbillivirus [DMV], porpoise morbillivirus [PMV]) including risk factors for exposure. We also examine the relationships between antibody levels and hematologic values established in the previous companion article. Antibodies to Toxoplasma gondii and morbilliviruses were found in both sample years. We found a significant inverse relationship between CDV titer and total leukocytes, neutrophils, monocytes, and eosinophils, and a significant positive relationship between eosinophils and Toxoplasma gondii antibodies. Morbilliviral prevalence varied significantly among age cohorts, with 1–2 year olds least likely to be seropositive and bears aged 5–7 most likely. Data suggest that the presence of CDV and Toxoplasma gondii antibodies is associated with polar bear hematologic values. We conclude that exposure to CDV-like antigen is not randomly distributed among age classes and suggest that differing behaviors among life history stages may drive probability of specific antibody presence.

  12. Den fleksible leders identitetsarbejde

    DEFF Research Database (Denmark)

    Madsen, Charlotte Øland

    2012-01-01

    Den lingvistiske drejning i organisationsforskningen giver nye perspektiver også på forskning indenfor organisering og ledelse (Boje 1995, Alvesson et. al. 2000b). Udviklingen af sprogforskningen (Wittgenstein 1953), og diskursteorien (Derrida 1976, Foucault 1979), den narrative teori (Boje 1995......, Boje et. al. 2004) samt en ny og spændende form for socialpsykologi (Potter et. al., 1987, Gergen 2011) beskrives i denne konferenceartikel som en alternativ måde at se organiseringsprocesser og ledelse på. Temaet i konferenceartiklen er hvordan den socialkonstruktionistiske tilgang kan bidrage til...

  13. Den egyptiske balancegang

    OpenAIRE

    Danielsen, Claus; Eilersen, Thore West; Rasmussen, Peter Henning; Kennedy, Ian Christian; Hansen, Mikala Sejer

    2008-01-01

    Opgaven er en undersøgelse af de omstændigheder Egypten stod i, da den palæstinensiske organisation Hamas valgte at sprænge grænsehegnet mellem Egypten og Gaza-striben den 23. januar 2008. Derfor er der i opgaven en tese om, at Egypten forsøger at bevare en magtmæssig status quo i regionen. Den historiske empiri er derfor med til at dokumentere Egyptens skiftende udenrigspolitik. Teoretisk er opgaven baseret på realismen og i særdeleshed Kenneth N. Waltz begreb om balance of power og status q...

  14. Den Gode Historie

    DEFF Research Database (Denmark)

    Mogensen, T.E.

    den nysgerrige læser af trilogien. Den kan beses og bestilles på: www.universitypress.dk/DK/detail.php?token=73278292116&R=8778387078&N=nej ELLER KØB DEN DIREKTE HOS MIG: SLAGTILBUD 100 kr. (inkl. porto og forsendelse)!                            Henvendelse pr. e-mail til tine.engel@gmail.com...

  15. Spatial and temporal trends of selected trace elements in liver tissue from polar bears (Ursus maritimus) from Alaska, Canada and Greenland

    Science.gov (United States)

    Routti, H.; Letcher, R.J.; Born, E.W.; Branigan, M.; Dietz, R.; Evans, T.J.; Fisk, A.T.; Peacock, E.; Sonne, C.

    2011-01-01

    Spatial trends and comparative changes in time of selected trace elements were studied in liver tissue from polar bears from ten different subpopulation locations in Alaska, Canadian Arctic and East Greenland. For nine of the trace elements (As, Cd, Cu, Hg, Mn, Pb, Rb, Se and Zn) spatial trends were investigated in 136 specimens sampled during 2005-2008 from bears from these ten subpopulations. Concentrations of Hg, Se and As were highest in the (northern and southern) Beaufort Sea area and lowest in (western and southern) Hudson Bay area and Chukchi/Bering Sea. In contrast, concentrations of Cd showed an increasing trend from east to west. Minor or no spatial trends were observed for Cu, Mn, Rb and Zn. Spatial trends were in agreement with previous studies, possibly explained by natural phenomena. To assess temporal changes of Cd, Hg, Se and Zn concentrations during the last decades, we compared our results to previously published data. These time comparisons suggested recent Hg increase in East Greenland polar bears. This may be related to Hg emissions and/or climate-induced changes in Hg cycles or changes in the polar bear food web related to global warming. Also, Hg:Se molar ratio has increased in East Greenland polar bears, which suggests there may be an increased risk for Hg 2+-mediated toxicity. Since the underlying reasons for spatial trends or changes in time of trace elements in the Arctic are still largely unknown, future studies should focus on the role of changing climate and trace metal emissions on geographical and temporal trends of trace elements. ?? 2011 The Royal Society of Chemistry.

  16. Denver District Laboratory (DEN)

    Data.gov (United States)

    Federal Laboratory Consortium — Program CapabilitiesDEN-DO Laboratory is a multi-functional laboratory capable of analyzing most chemical analytes and pathogenic/non-pathogenic microorganisms found...

  17. Den antikke katapults udvikling

    DEFF Research Database (Denmark)

    Paasch, Kasper

    2011-01-01

    Hvordan bygger man en katapult? Dette spørgsmål belyses ved at se på den græske og romerske katapults udviklingshistorie samt på den forskningshistoriske tilgang til emnet, hovedsageligt set ud fra et ingeniørmæssig/matematisk synspunkt. Katapulten menes opfundet år 399 f.Kr. og blot ca. 120-150 ...

  18. Den Lille Leder

    DEFF Research Database (Denmark)

    Juhl, Martin; Ussing, Lene Faber

    En lille lommebog, der i fem trin hjælper dig som projektleder til succesfulde projekter i entreprenørbranchen. "Den lille leder" indeholder udvalgte ledelsesteorier, der er relevante for projektledere i byggebranchen.......En lille lommebog, der i fem trin hjælper dig som projektleder til succesfulde projekter i entreprenørbranchen. "Den lille leder" indeholder udvalgte ledelsesteorier, der er relevante for projektledere i byggebranchen....

  19. Den Danske Begrebsordbog

    DEFF Research Database (Denmark)

    Nimb, Sanni; Trap-Jensen, Lars; Lorentzen, Henrik;

    Den Danske Begrebsordbog er en ordbog, der er ordnet systematisk efter begreb, dvs. at ordene er grupperet efter deres betydning og ikke alfabetisk.Ordbogen indeholder næsten 200.000 ord og udtryk, og den dækker alt mellem himmel og jord såsom tid og rum, følelser og tænkning, samfund og...

  20. Den signede dag

    DEFF Research Database (Denmark)

    Balslev-Clausen, Peter

    2010-01-01

    Artiklen gennemgår de tre middelalderlige versioner af den fællesnordiske dagvise fra 14. århundrede og gør rede for salmens tekst- og receptionshistorie i Dansk tradition.......Artiklen gennemgår de tre middelalderlige versioner af den fællesnordiske dagvise fra 14. århundrede og gør rede for salmens tekst- og receptionshistorie i Dansk tradition....

  1. Den store fred

    DEFF Research Database (Denmark)

    Necef, Mehmet Ümit

    2013-01-01

    Der har de seneste måneder foregået seriøse fredsforhandlinger mellem den tyrkiske stat og PKK (Det kurdiske Arbejderparti) for at løse den 30-årige blo-dige konflikt. Denne artikel diskuterer, hvorfor det netop er en moderat isla-misk regering, der gør en stor indsats for at stoppe krigen med en...

  2. Den mobile protese

    DEFF Research Database (Denmark)

    Winther, Ida Wentzel

    2008-01-01

    Mobiltelefonen er med til at ændre vores sanse-matrix. Når en genstand får protesekarakter og kommer i front, skubbes andre sanser bagud. Håndprotesen rækker længere frem og har egenskaber som langt overgår en almindelig hånd. Den ser ud og lyder af noget, den kan skabe kontakt med det virtuelle ...

  3. EF & den sociale dimension

    DEFF Research Database (Denmark)

    Due, Jesper Jørgen; Madsen, Jørgen Steen; Jensen, Carsten Strøby

    En analyse af EU's institutioner og udviklingen af den sociale dimension i forbindelse med etbaleringen af det indre marked med særlig henblik på effekterne på det danske aftalesystem.......En analyse af EU's institutioner og udviklingen af den sociale dimension i forbindelse med etbaleringen af det indre marked med særlig henblik på effekterne på det danske aftalesystem....

  4. Healthies er den nye selfie

    DEFF Research Database (Denmark)

    Fausing, Bent

    2015-01-01

    Om den sunde selfie, healthien. Om årsagne til dens opståen, succes og visuelt kulturelle og æstetiske betydning på de sociale medier.......Om den sunde selfie, healthien. Om årsagne til dens opståen, succes og visuelt kulturelle og æstetiske betydning på de sociale medier....

  5. Den digitale (r)evolution

    DEFF Research Database (Denmark)

    Pedersen, Rasmus Rex

    2016-01-01

    Dette kapitel undersøger hvordan den såkaldte ’digitale revolution’ af musikindustrierne har påvirket institutionelle og organisatoriske vilkår i den danske musikbranche. Gennem analyse af omsætningstal fra forskellige sektorer i den danske musikbranche udfordres den dominerende opfattelse af en...

  6. Reproductive performance in East Greenland polar bears (Ursus maritimus) may be affected by organohalogen contaminants as shown by physiologically-based pharmacokinetic (PBPK) modelling

    DEFF Research Database (Denmark)

    Sonne, Christian; Gustavson, Kim; Rigét, Frank F.

    2009-01-01

    quotient (RQ) evaluation to more quantitatively evaluate the effect risk on reproduction (embryotoxicity and teratogenicity) based on the critical body residue (CBR) concept and using a physiologically-based pharmacokinetic (PBPK) model. We applied modelling approaches to PCBs, p,p′-DDE, dieldrin......, oxychlordane, HCHs, HCB, PBDEs and PFOS in East Greenland polar bears based on known OHC pharmacokinetics and dynamics in laboratory rats (Rattus rattus). The results showed that subcutaneous adipose tissue concentrations of dieldrin (range: 79–1271 ng g−1 lw) and PCBs (range: 4128–53 923 ng g−1 lw) reported...... and for dieldrin (range: 43–640 ng g−1 lw), PCBs (range: 3491–13 243 ng g−1 lw) and PFOS (range: 1332–6160 ng g−1 ww) in the year 2006. The concentrations of oxychlordane, DDTs, HCB and HCHs in polar bears resulted in RQs

  7. Taming The Polar Bear

    Science.gov (United States)

    2014-04-01

    from Svalbard; in addition, this area is flanked by Russian military on the Kola Peninsula threatening forces as they deploy. Apart from the vast...into the European Arctic, at distance from Russian military forces in the Kola Peninsula. Although a NATO member, Iceland does not have any military

  8. Den digitale patient

    DEFF Research Database (Denmark)

    Dahl, Mads Ronald; birkler, jacob

    Den digitale patient tager afsæt i en ny verden: Patienten er blevet digitaliseret! Men hvem og hvad er den digitale patient, og hvornår og hvordan bliver den enkelte borger til en digital patient? Bogen indkredser patientens nye digitale identitet, som kan skabe grobund for en fælles forståelse og...... tværfagligt samarbejde mellem forskellige faggrupper. Bogens målgruppe er alle, som arbejder professionelt med sundhed og sundhedsvæsenet i Danmark. Det gælder på grunduddannelsesniveau, i forhold til efter- og videreuddannelse samt i klinisk praksis og blandt praktikere. Den digitale patient er skrevet ud...... fra et patientperspektiv, og ideen er at synliggørelse de mange udfordringer og konsekvenser, sundhedsinformatikken er svanger med. Bogen beskriver ikke blot den digitale patients fremtid, men fokuserer især på en række forhold og forbehold, der bør medtænkes, når nye elektroniske kommunikationsveje...

  9. Demography of an apex predator at the edge of its range: impacts of changing sea ice on polar bears in Hudson Bay

    Science.gov (United States)

    Lunn, Nicholas J.; Servanty, Sabrina; Regehr, Eric V.; Converse, Sarah J.; Richardson, Evan S.; Stirling, Ian

    2016-01-01

    Changes in the abundance and distribution of wildlife populations are common consequences of historic and contemporary climate change. Some Arctic marine mammals, such as the polar bear (Ursus maritimus), may be particularly vulnerable to such changes due to the loss of Arctic sea ice. We evaluated the impacts of environmental variation on demographic rates for the Western Hudson Bay (WH), polar bear subpopulation from 1984 to 2011 using live-recapture and dead-recovery data in a Bayesian implementation of multistate capture–recapture models. We found that survival of female polar bears was related to the annual timing of sea ice break-up and formation. Using estimated vital rates (e.g., survival and reproduction) in matrix projection models, we calculated the growth rate of the WH subpopulation and projected population responses under different environmental scenarios while accounting for parametric uncertainty, temporal variation, and demographic stochasticity. Our analysis suggested a long-term decline in the number of bears from 1185 (95% Bayesian credible interval [BCI] = 993–1411) in 1987 to 806 (95% BCI = 653–984) in 2011. In the last 10 yr of the study, the number of bears appeared stable due to temporary stability in sea ice conditions (mean population growth rate for the period 2001–2010 = 1.02, 95% BCI = 0.98–1.06). Looking forward, we estimated long-term growth rates for the WH subpopulation of ~1.02 (95% BCI = 1.00–1.05) and 0.97 (95% BCI = 0.92–1.01) under hypothetical high and low sea ice conditions, respectively. Our findings support previous evidence for a demographic linkage between sea ice conditions and polar bear population dynamics. Furthermore, we present a robust framework for sensitivity analysis with respect to continued climate change (e.g., to inform scenario planning) and for evaluating the combined effects of climate change and management actions on the status of wildlife populations.

  10. Demography of an apex predator at the edge of its range: impacts of changing sea ice on polar bears in Hudson Bay.

    Science.gov (United States)

    Lunn, Nicholas J; Servanty, Sabrina; Regehr, Eric V; Converse, Sarah J; Richardson, Evan; Stirling, Ian

    2016-07-01

    Changes in the abundance and distribution of wildlife populations are common consequences of historic and contemporary climate change. Some Arctic marine mammals, such as the polar bear (Ursus maritimus), may be particularly vulnerable to such changes due to the loss of Arctic sea ice. We evaluated the impacts of environmental variation on demographic rates for the Western Hudson Bay (WH), polar bear subpopulation from 1984 to 2011 using live-recapture and dead-recovery data in a Bayesian implementation of multistate capture-recapture models. We found that survival of female polar bears was related to the annual timing of sea ice break-up and formation. Using estimated vital rates (e.g., survival and reproduction) in matrix projection models, we calculated the growth rate of the WH subpopulation and projected population responses under different environmental scenarios while accounting for parametric uncertainty, temporal variation, and demographic stochasticity. Our analysis suggested a long-term decline in the number of bears from 1185 (95% Bayesian credible interval [BCI] = 993-1411) in 1987 to 806 (95% BCI = 653-984) in 2011. In the last 10 yr of the study, the number of bears appeared stable due to temporary stability in sea ice conditions (mean population growth rate for the period 2001-2010 = 1.02, 95% BCI = 0.98-1.06). Looking forward, we estimated long-term growth rates for the WH subpopulation of ~1.02 (95% BCI = 1.00-1.05) and 0.97 (95% BCI = 0.92-1.01) under hypothetical high and low sea ice conditions, respectively. Our findings support previous evidence for a demographic linkage between sea ice conditions and polar bear population dynamics. Furthermore, we present a robust framework for sensitivity analysis with respect to continued climate change (e.g., to inform scenario planning) and for evaluating the combined effects of climate change and management actions on the status of wildlife populations.

  11. Grizzly bear

    Science.gov (United States)

    Schwartz, C.C.; Miller, S.D.; Haroldson, M.A.; Feldhamer, G.; Thompson, B.; Chapman, J.

    2003-01-01

    The grizzly bear inspires fear, awe, and respect in humans to a degree unmatched by any other North American wild mammal. Like other bear species, it can inflict serious injury and death on humans and sometimes does. Unlike the polar bear (Ursus maritimus) of the sparsely inhabited northern arctic, however, grizzly bears still live in areas visited by crowds of people, where presence of the grizzly remains physically real and emotionally dominant. A hike in the wilderness that includes grizzly bears is different from a stroll in a forest from which grizzly bears have been purged; nighttime conversations around the campfire and dreams in the tent reflect the presence of the great bear. Contributing to the aura of the grizzly bear is the mixture of myth and reality about its ferocity. unpredictable disposition, large size, strength, huge canines, long claws, keen senses, swiftness, and playfulness. They share characteristics with humans such as generalist life history strategies. extended periods of maternal care, and omnivorous diets. These factors capture the human imagination in ways distinct from other North American mammals. Precontact Native American legends reflected the same fascination with the grizzly bear as modern stories and legends (Rockwell 1991).

  12. Den formbare seksualitet

    DEFF Research Database (Denmark)

    Lützen, Karin Cohr

    2016-01-01

    Den amerikanske sociolog John Gagnon så seksualiteten som noget, vi lærer af vores omgivelser, ligesom vi lærer at spille tennis eller at spise snegle. Karin Lützen mindes en ven og et forbillede.......Den amerikanske sociolog John Gagnon så seksualiteten som noget, vi lærer af vores omgivelser, ligesom vi lærer at spille tennis eller at spise snegle. Karin Lützen mindes en ven og et forbillede....

  13. Den materielle drejning

    DEFF Research Database (Denmark)

    Skiveren, Tobias; Gregersen, Martin

    2015-01-01

    Ved at trække på en række forskellige tænkere som Jane Bennett, Arne Næss, Donna Haraway og Karan Barad relaterer artiklen den såkaldte materielle drejning til tre filosofisk-teoretiske nyorienteringer: økokritik, det posthumane og kropsmaterialisme. Tesen er, at interaktionenen mellem disse...

  14. Den materielle drejning

    DEFF Research Database (Denmark)

    Skiveren, Tobias; Gregersen, Martin

    2015-01-01

    Ved at trække på en række forskellige tænkere som Jane Bennett, Arne Næss, Donna Haraway og Karan Barad relaterer artiklen den såkaldte materielle drejning til tre filosofisk-teoretiske nyorienteringer: økokritik, det posthumane og kropsmaterialisme. Tesen er, at interaktionenen mellem disse...

  15. Den unge Burkes Satire

    DEFF Research Database (Denmark)

    Ørndorf, Steen

    Edmund Burke (1730-1797) er i nyere tid blevet politisk ikon, kendt som konservatismens fader. Berømmelsen skyldes hovedværket fra 1790, Reflections on the Revolution in France, som er et angreb på den franske revolution. Ungdomsarbejdet A Vindication of Natural Society er fra 1756 og har status...... både som konservativ forløber for Burkes hovedværk, og som radikalt modstykke hertil. Burkes fremragende sprogfornemmelse udfoldes her i et rent festfyrværkeri af besnærende argumenter. Den forførende retorik bedøver læserens fornuft. Denne virkning gør sig stadig gældende. Læst med fornuft, er det et......: "Forfatteren har et imponerende kendskab til Burkelitteraturen og til datidens engelske samfundsforhold. Behandlingen af Burke er kompetent og dybdegående. Stærkest er Ørndorfs diskussion af Burkes A Vindication of Natural Society og den receptionshistorie, der knytter sig til værket. Jeg er af den opfattelse...

  16. Den Akutte Patient

    DEFF Research Database (Denmark)

    Laursen, Christian B.; Graumann, Ole

    2016-01-01

    UL-vejledte teknikker til anlæggelse af dræn, katetre og karadgange samt til udtømning af væskefyldte hulrum præsenteres som point of care-procedurer, der på sigt bør indgå i det rutinemæssige arbejde i den akutte modtagelse....

  17. Den menneskelige eksistens

    DEFF Research Database (Denmark)

    tilværelse. Dermed tilbyder den et bedre grundlag for at forstå fremtrædende kultursociologiske og socialpsykologiske problemer som identitetsusikkerhed, angst og raseri såvel som frigørende muligheder for engagement og kreativitet. Foruden originale tekster af Merleau-Ponty, Ricœur og Waldenfels rummer...

  18. Den amerikanske udfordring

    DEFF Research Database (Denmark)

    Böss, Michael

    1994-01-01

    Artiklen beskriver den bulgarsk-franske tænker Tzvetan Todorovs udvikling fra litteraturteoretiker til bredt humanistisk engageret tænker. I artiklen argumenteres der for, at Todorovs bekendelse til oplysningshumanismen skal forstås på baggrund af hans personlige erfaringer fra en opvækst i det...

  19. Den patriarkalske Abraham

    DEFF Research Database (Denmark)

    Jensen, Hans Jørgen Lundager

    2015-01-01

    økonomi og slægtskabsrelationer. I Mary Douglas' Grid/Group-skema vil Abraham stå i samme grad fjernt fra præsteligt-hierarkiske og deuteronomistisk-enklavistiske idealer, De pietistiske og etnocentriske temaer som den bibelske tekstoverleveringsproces har tilføjet Abraham-figuren, har ikke tildækket en...

  20. Den kaotiske organisation

    DEFF Research Database (Denmark)

    Helms, Niels Henrik

    2006-01-01

    Præsentation af den britiske organisationsteoretiker Ralph Stacey: Stacey mener samlet, at organisationer ikke skal ses som systemer, der opstår, når individer interagerer med hinanden. Det er selve interaktionen, der er organisationen. Staceys kernebegreb er temporære processer. Når vi interager...

  1. Den danske regionskonstruktion

    DEFF Research Database (Denmark)

    Klausen, Kurt Klaudi

    Region Midtjylland er i centrum for analysen men den omfatter også regionsdannelsen i almindelighed. Der anlægges i analysen på samme tid et politologisk, organisationsteoretisk og økonomisk resonnement. Regionsdannelsen finder sted på baggrund af de setup Strukturreformen har sat, men udfoldes p...

  2. Den personlige dimension

    DEFF Research Database (Denmark)

    Olsen, Jan Brødslev

    2009-01-01

    Personlig udvikling og kompetence er vigtige dimensioner i sygeplejerskeuddannelsen. Dette stiller krav til læringsmæssige metoder, som er specielt egenede til denne særlige undervisningsopgave. På baggrund af en række psykologiske og filosofiske inspirationskilder foreslåes den såkaldste...

  3. Den personlige dimension

    DEFF Research Database (Denmark)

    Olsen, Jan Brødslev

    2009-01-01

    Personlig udvikling og kompetence er vigtige dimensioner i sygeplejerskeuddannelsen. Dette stiller krav til læringsmæssige metoder, som er specielt egenede til denne særlige undervisningsopgave. På baggrund af en række psykologiske og filosofiske inspirationskilder foreslåes den såkaldste...

  4. Den sundhedsvidenskabelige opgave

    DEFF Research Database (Denmark)

    Lindahl, Marianne Pia; Juhl, Carsten Bogh

    troværdigheden af sine resultater. Bogen er opdateret, så den refererer til Microsoft Office 2013, og giver instruktioner og tips til: • Hvordan man bruger Word til hjælp med indholdsfortegnelse, overskrifter og korrektur • Hvordan man bruger Word til hjælp med diagrammer og tabeller• Hvordan man bruger Excel...

  5. Den globale provins

    DEFF Research Database (Denmark)

    Gebauer, Mirjam

    2008-01-01

    »Den globale provins« gennemgår - med udgangspunkt i Ottmar Ettes begreb om at skrive mellem verdener - centrale værker fra denne migrationslitteratur. Ilija Trojanow kan med sin bulgarsk-sydafrikansk-østrigske baggrund beskrive en global verden mangfoldigt og komplekst, mens forfattere som Selim...

  6. Den relationelle psykiatri

    DEFF Research Database (Denmark)

    Kjølbye, Morten; Jacobsen, Claus Haugaard

    2009-01-01

    Dette kapitel bygger videre på kapitlet om det teoretiske grundlag for den relationelle psykiatri. I perspektiv af en mentaliseringsbaseret forståelse præsenteres en række psykopatologiske faktorer samt en model til forståelse af psykopatologisk udvikling. Ved inddragelse af kasuistisk materiale ...

  7. Den sociale stofmisbrugsbehandling. Del 2

    DEFF Research Database (Denmark)

    Sørensen, Maren; Skov, Dorthe; Ellersgaard, Christoph

    Dette er den anden delrapport i en rapportserie om den sociale stofmisbrugsbehandling i Danmark. Rapportserien bygger på en omfattende undersøgelse, der blev fortaget i perioden december 2007 til maj 2009. Denne delrapport belyser den sociale stofmisbrugsbehandling i Danmark ud fra brugerne og de...

  8. Hvad karakteriserer den netbaserede vejledning?

    DEFF Research Database (Denmark)

    Kjeldsen, Lars Peter

    2008-01-01

    Hensigten med artiklen er at bidrage til forståelsen af sider ved den netbaserede vejledning. Fremgangsmåden vil være: •Først at beskrive og diskutere, hvorledes jeg forstår det virtuelle læringsmiljø, herunder en afklaring af, hvad der karakteriserer den netbaserede vejledning. •Dernæst gennem e...

  9. Den naturlige tillid og tilknytning

    DEFF Research Database (Denmark)

    Bo, Inger Glavind

    2008-01-01

    indstilling. Herved revurderes Alfred Schutz' begreb om den naturlige indstilling, idet tilliden nok er en del heraf og af den rutiniserede holdning i hverdagslivet, men også er rimelig skrøbelig og afhængig af del individets tidligere tilknytning, dels den fortsatte skabelse af ontologisk sikkerhed i...

  10. Dannelsen af den ansvarlige elev

    DEFF Research Database (Denmark)

    Larsen, Jesper

    2010-01-01

    Denne artikel handler om den del af lærergerningen, der har at gøre med udarbejdelse af elevplaner. Der tages udgangspunkt i en foucaultsk forståelse, hvor beskrivelsen af den enkelte elev udtrykker et særligt normativt ideal om, hvilke former for elevhed der er de ønskværdige i den danske...

  11. Kollegaerne er den nye chef

    DEFF Research Database (Denmark)

    Fugl, Marie

    2008-01-01

    Den tid, hvor chefen var den, der delte skideballer ud, er slut. Rollen som 'bad cop' er overtaget af kollegateamet, der med hård hånd sørger for, at den enkelte yder sin del. Udgivelsesdato: November...

  12. Den liberale tolerance

    DEFF Research Database (Denmark)

    Mchangama, Jacob; Andersen, Rasmus Fonnesbæk

    2012-01-01

    Tolerance er en kerneværdi i den liberal-demokratiske samfundsordenen, men i vor tid er det liberale tolerancebegreb om ikke at gribe ind i det, man ikke synes om, kommet under angreb fra flere sider, især som følge af problemer med indvandring og integration. Tolerance opfattes i stigende grad som...... begrænset tolerancebegreb igen bør træde i stedet for den multikulturalistisk inspirerede forståelse af tolerance, som er fremtrædende i dag, og som faktisk begrunder en institutionaliseret intolerance i form af en række begrænsninger på særligt ytringsfriheden....

  13. Den der ser, er den, der ses

    DEFF Research Database (Denmark)

    Bjerrum, Troels

    2010-01-01

    at foretage sig nødvendige samfundsmæssige valg. På grund af nederlag i hjem, skole, uddannelse og erhverv søger unge fællesskaber i ligestillede miljøer svarende til egen negative forventningspraksis. Den unge praktiserer en vanedannende negativ livsførelse, som eskalerer til yderligere socialt forfald. Unge......, der har levet i kriminalitet, misbrug og medmisbrug i lang tid, vil ikke være i stand til at realisere sig positivt pga. en personlig indgroet diskvalificerende forestilling. Afhandlingen forklarer, hvorledes negative oplevelser forbliver spændinger i menneskers krop. Teorier af Maurice Merleau...... begreb for personlig sammenhæng af kropslig tilstedeværelse og erkendelse. Bevidst kan udsatte unge forhindre vanedannende impulsstyring og lære sig selv at rette intension ud mod verden frem for aggression. Grundlæggende er det afhandlingens tese, at gentagende negative oplevelser lægger mønstret til...

  14. Den retoriske situation

    DEFF Research Database (Denmark)

    Hansen, Jette Barnholdt

    2009-01-01

    Artiklen, som er skrevet på baggrund af et oplæg, som jeg holdt på  Årsmødet for Sektionen for Gymnasium og HF i Helsingør, oktober 2009, plæderer for anvendelsen af Lloyd F. Bitzers teori om den retoriske situation i retorikundervisningen i gymnasiet. I artiklen benytter jeg Bitzers teori som en...

  15. Den animerede bygning

    DEFF Research Database (Denmark)

    Bertram, Peter

    2008-01-01

    for ikke at gøre.[ii] Synets potentialitet er evnen til at se mørket, synets ikke - evne. Og hørelsens potentialitet er stilheden. Da begivenheden er fremmed og aldrig udfoldes, er det med ikke-evnen, at man kommer den i møde. Begivenheden forsvinder bag evnernes støj, der altid gentager, det de kan. Hvis...

  16. Den Magiske Kugle

    DEFF Research Database (Denmark)

    Nørgaard, Bent

    2007-01-01

    og ikke skader kroppens sunde celler. Metoden går ud på at indkapsle kræftmedicin i bittesmå fedtkugler, såkaldt "magiske kugler". I forestillingen følger vi de magiske kuglers fantastiske rejse: Lige fra deres spæde fødsel som en vision fremsat af den tyske nobelprisvinder dr. Paul Ehrlich i...

  17. Den moderne russiske stat

    DEFF Research Database (Denmark)

    Hansen, Flemming Splidsboel

    Briefet er inddelt i tre hovedafsnit. I første del gennemgås de tre verdensordener kort, og Flemming Splidsboel forklarer hvorledes de forholder sig til hinanden. Derefter diskuteres det russiske syn på fire elementer fra de moderne og postmoderne verdensordener - suverænitet, magt, de nationale ...... interesser og individets status. Flemming Splidsboel slutter af med at præsentere nogle tanker vedrørende den fremtidige læring i Rusland....

  18. Den interkonfessionelle dialog

    DEFF Research Database (Denmark)

    Pedersen, Else Marie Wiberg

    2006-01-01

    På baggrund af en gennemgang af det 20. århundredes økumeniske hermeneutik, foreslås det i denne artikel, at den økumeniske dialog (et ord, som oversættes forskelligt af de forskellige konfessioner) erstattes af en økumenisk diskurs (jf. Michel de Certau og Lukas Vischer). Der plæderes således fo...

  19. Villavejen og dens muligheder

    DEFF Research Database (Denmark)

    Vedel-Petersen, F.

    Publikationen handler om hvordan villavejen kan tilføres nye kvaliteter, blive smukkere, mere oplevelsesrig og sikker for de mange der bor og færdes på vejen. Den beskriver en lille villavej, Hjortekærbakken, og indeholder desuden en række råd og anvisninger vedrørende planlægning af nye villavej...

  20. Hvorfor den titel?

    DEFF Research Database (Denmark)

    Krejberg, Kasper Green

    2015-01-01

    Den skandaløse titel på Karl Ove Knausgårds store selvbiografi Min kamp 1-6 er ikke kun en provokation eller en ironisk kommentar, men udtryk for en gennemgående interesse for og fascination af nazismen. Artiklen ser denne fascination efter i sømmene og beskriver dermed, hvad formålet med referen...... referencen til Hitlers Mein Kampf kan være...

  1. Den gamle verdens magi

    DEFF Research Database (Denmark)

    Holck, Jakob Povl

    I denne bog præsenterer forskningsbibliotekar cand.mag., ph.d. Jakob Povl Holck sjældne bøger og andre biblioteksmaterialer fra Herlufsholm-samlingen på Syddansk Universitetsbibliotek i Odense. Bogens form udgør en mosaik af værker i tekst og især billeder med speciel vægt på ’den videnskabelige ...

  2. Bears, Big and Little. Young Discovery Library Series.

    Science.gov (United States)

    Pfeffer, Pierre

    This book is written for children 5 through 10. Part of a series designed to develop their curiosity, fascinate them and educate them, this volume describes: (1) the eight species of bears, including black bear, brown bear, grizzly bear, spectacled bear, sun bear, sloth bear, polar bear, and giant panda; (2) geographical habitats of bears; (3)…

  3. Combined thin layer chromatography and gas chromatography with mass spectrometric analysis of lipid classes and fatty acids in malnourished polar bears (Ursus maritimus) which swam to Iceland.

    Science.gov (United States)

    Eibler, Dorothee; Krüger, Sabine; Skírnisson, Karl; Vetter, Walter

    2017-03-01

    Between 2008 and 2011, four polar bears (Ursus maritimus) from the Greenland population swam and/or drifted on ice to Iceland where they arrived in very poor body condition. Body fat resources in these animals were only between 0% and 10% of the body weight (usually 25%). Here we studied the lipid composition in different tissues (adipose tissue if available, liver, kidney and muscle). Lipid classes were determined by thin layer chromatography (TLC) and on-column gas chromatography with mass spectrometry (GC/MS). The fatty acid pattern of total lipids and free fatty acids was analyzed by GC/MS in selected ion monitoring (SIM) mode. Additionally, cholesteryl esters and native fatty acid methyl esters, initially detected as zones in thin layer chromatograms, were enriched by solid phase extraction and quantified by GC/MS. The ratio of free fatty acids to native fatty acid methyl esters could be correlated with the remained body lipids in the polar bears and thus may also serve as a marker for other starving animals or even for humans. Copyright © 2017 Elsevier B.V. All rights reserved.

  4. Den naturfaglige evalueringskultur i folkeskolen

    DEFF Research Database (Denmark)

    Dolin, Jens; Krogh, Lars Brian

    2008-01-01

    Formålet med denne rapport er at etablere et grundlag for at kunne vurdere, hvorvidt PISAs testformat og tilgang til testning svarer til den evalueringskultur, der er fremherskende i naturfagene i de ældste klasser i den danske folkeskole.   Rapporten indledes med en kortfattet oversigt over nogl...... at tage PISA-science testen.   Rapporten slutter med en konklusion over de vigtigste resultater, hvor PISA-science testen sammenholdes med den danske evalueringskultur....

  5. Three decades (1983-2010) of contaminant trends in East Greenland polar bears (Ursus maritimus). Part 2

    DEFF Research Database (Denmark)

    Dietz, Rune; Rigét, Frank F; Sonne, Christian

    2013-01-01

    and p,p'-DDT, α- and β-hexachlorocyclohexane (HCH), HCB, octachlorostyrene, dieldrin, oxychlordane, cis- and trans-chlordane, cis- and trans-nonachlor, heptachlor epoxide and BB-153), 18 showed statistically significant average yearly declines of -4.4% (range: -2.0 to -10.8%/year) among subadult polar...

  6. Organohalogen concentrations and a gross and histologic assessment of multiple organ systems in East Greenland polar bears (Ursus maritimus)

    DEFF Research Database (Denmark)

    Sonne, C.

    subsistence hunters from Central East Greenland (69°00'N to 74°00'N)during 1999-2002. The present thesis exposes the first and most important results from this large multidisciplinary study of this material, and evaluates the possible connection between the relatively high levels of organohalogens...... to the relatively high levels of organohalogens. But, there was indications of strong relationships between various organohalogen compounds and skull mineral density indicating disruption of the bone mineral composition. The histopathological changes found in liver- and kidney tissue were a result of ageing......, infectious agents, season and meaby chronic exposure to organohalogens. These result fill out an existing knowledge gap in potential effects of environmental, organic contaminants on fluctuating asymmetry, bone mineral density and functional anatomy (histology) in the polar bear. In addition, the results may...

  7. Velkommen til den posthumane tilstand

    DEFF Research Database (Denmark)

    Wamberg, Jacob

    2015-01-01

    Hvorfor er moderne kunst så insisterende mærkværdig? Fordi den udforsker en posthuman tilstand, som bliver stadig mere påtrængende.......Hvorfor er moderne kunst så insisterende mærkværdig? Fordi den udforsker en posthuman tilstand, som bliver stadig mere påtrængende....

  8. Stordriftsfordele i den danske banksektor?

    DEFF Research Database (Denmark)

    Kristensen, Troels

    2008-01-01

    Dette er en empirisk undersøgelse af skalaegenskaber (economies of scale) i den danske banksektor baseret på cross-section data. Banksektorens omkostningsfunktion er estimeret vha. en translogomkostningsfunktion og OLS-regression. Ud fra den estimerede omkostningsfunktion er skalaegenskaberne...

  9. Neue Anforderungen an den Datenschutz

    Science.gov (United States)

    Dix, Alexander

    Eine von der Europäischen Kommission 2003 in Auftrag gegebene Studie hat die rasante technische Entwicklung hin zu "Ambient Intelligence Technologies“ als die größte Herausforderung für den Datenschutz bezeichnet, die sogar größer als die Herausforderung durch den internationalen Terrorismus nach dem 11. September sei.

  10. Den naturlige tillid og tilknytning

    DEFF Research Database (Denmark)

    Bo, Inger Glavind

    2008-01-01

    Giddens og Johan Bowlbys forståelser af den fundamentale tillid eller sikker base kædes tilliden sammen med det spæde barns tilknytning til sine primære omsorgspersoner, da det er her fundamentet for senere tilknytningsadfærd og tillidsrelationer etableres som en integreret del af den naturlige...

  11. Forord til den danske udgave

    DEFF Research Database (Denmark)

    Egelund, Niels

    2014-01-01

    Forord til den danske udgave af: Leading and managing a differentiated classroom / af Carol Ann Tomlinson og Marcia B. Imbeau......Forord til den danske udgave af: Leading and managing a differentiated classroom / af Carol Ann Tomlinson og Marcia B. Imbeau...

  12. Den medicinal-industrielle logik

    DEFF Research Database (Denmark)

    Børsen, Tom

    2008-01-01

    Et kig på medicinalindustrien og den logik der styrer udviklingen af nye lægemidler. Antagelsen er, at der også eksisterer et medicinalindustrielt kompleks, bestående af ledende industrifolk, læger, forskere og regeringsembedsmænd, der alle har kommercielle interesser i den herskende lægemiddeltæ...

  13. Litteratur i den argumentative ret

    DEFF Research Database (Denmark)

    Jørgensen, Stine

    2007-01-01

    Med udgangspunkt i den litterære rett, slik som denne er udviklet af den amerikanske retsfilosof Martha Nussbaum, argumentere de for, at litteraturen er velegnet som en metode til at opnå menneskelig forståelse. Som led i denne problemstillingen behandles følelsenes plads i retsvidenskaben. Endelig...

  14. Den narrative tilgang

    DEFF Research Database (Denmark)

    Bo, Inger Glavind

    2016-01-01

    I kapitlet gennemgås en socialkonstruktivistisk forståelse af narrativer. I kapitlet vil jeg gennemgå centrale teoretiske pointer, der samlet set er grundlæggende for en social konstruktivistisk forståelse af narrativer for herved at udfolde forståelsen af den narrative tilgang og desuden...... tydeliggøre, hvordan tilgangen er forbundet med en særlig forståelse af identitetsskabelse. Der er tale om pointer der almindeligvis forbindes med ”små fortællinger” i form af længere identitetsfortællinger og narrative interviews. Kapitlet gennemgår således centrale inspirationskilder og teoretiske pointer...

  15. Nonlinear Dynamic Response of an Unbalanced Flexible Rotor Supported by Elastic Bearings Lubricated with Piezo-Viscous Polar Fluids

    Directory of Open Access Journals (Sweden)

    Mustapha Lahmar

    2015-04-01

    Full Text Available On the basis of the V. K. Stokes micro-continuum theory, the effects of couple stresses on the nonlinear dynamic response of the unbalanced Jeffcott’s flexible rotor supported by layered hydrodynamic journal bearings is presented in this paper. A nonlinear transient modified Reynolds’ equation is derived and discretized by the finite element method to obtain the fluid-film pressure field as well as the film thickness by means of the implicit Euler method. The nonlinear orbits of the rotor center are determined by solving the nonlinear differential equations of motion with the explicit Euler’s scheme taking into account the flexibility of rotor. According to the obtained results, the combined effects of couple stresses due to the presence of polymer additives in lubricant and the pressure dependent viscosity on the nonlinear dynamic response of the rotor-bearing system are significant and cannot be ignored or overlooked. As expected, these effects are more noticeable for polymers characterized by higher length molecular chains.

  16. Den Sønderjyske Historiekanon

    DEFF Research Database (Denmark)

    2015-01-01

    Den Sønderjyske Historiekanon er et interaktivt læremiddel, hvor elever og andre interesserede kan blive klogere på den sønderjyske historie og debattere, hvilke begivenheder i Sønderjyllands historie der har størst betydning for deres liv i dag. På den måde kan de få en fornemmelse for, hvorfor...... det er væsentligt at forholde sig til fortiden. Den primære målgruppe er unge i folkeskolens ældre klasser og på ungdomsuddannelserne. Den Sønderjyske Historiekanon præsenterer gennem tekst og video 20 forskellige højdepunkter fra den sønderjyske historie. Opretter man en bruger, kan man deltage i...... afstemningsresultat for alle unge sønderjyske brugere, kaldet ”Den Fælles Sønderjyske Historiekanon”. Begge disse kanoner kan sammen med hjemmesidens materiale om historiebevidsthed bruges som udgangspunkt for refleksioner om, i hvilken grad man i dag kan tale om en særlig sønderjysk identitet....

  17. Monitoring and mitigating measures to reduce potential impacts of oil and gas exploration and development on bears in the Inuvik region

    Energy Technology Data Exchange (ETDEWEB)

    Branigan, M. [Government of the Northwest Territories, Inuvik, NT (Canada). Dept. of Environment and Natural Resources

    2007-07-01

    The Inuvik Region consists of the Northwest Territories portion of the Inuvialuit Settlement Region and the Gwich'in Settlement Area. The range of grizzly bears, polar bears and black bears extends to different parts of the region. The potential impact of development depends on the season of the development and the species of bear found in the footprint. As such, monitoring and mitigation measures should take this into consideration. This presentation focused on the potential impacts and current practices to monitor and mitigate the impacts in the region. Mitigation measures currently used include: communication with stakeholders; waste management guidelines; use of wildlife monitors to identify key habitat and den sites and to deter bears; minimum flight altitudes; and safety training. Suggestions for additional mitigation measures were also presented. figs.

  18. Den iscenesatte folkelighed

    Directory of Open Access Journals (Sweden)

    Néstor Garcia Canclini

    1994-09-01

    Full Text Available Hvad er "det folkelige" og hvad er "folkekultur"? Néstor Garcia Canclini har i denne artikel sat sig for at dekonstruere begrebet "det folkelige" og beskrive den måde, forskellige grupper bruger og misbruger begrebet på. Han analyserer tre fremherskende idéer om folkelighed: folkloristernes romantiske idé om det oprindelige, der blev ødelagt af massekulturen, massemediernes popularitetsbegreb og endelig populisternes - både de højre- og venstreorienteredes - iscenesættelse af folkeligheden. Desuden ser han på to marxistiske skolers opfattelse af forholdet mellem de dominerende og undertrykte klasser og forskellige definitioner af folkelig- hed. Ligesom Anamaria Fadul argumenterer Canclini for nødvendigheden af en ny, tværdiciplinær forskning, som opfanger kompleksitet og flerty- digheder i forholdet mellem de undertrykte og dominerende og ser "det folkelige" som en tragisk komedie med modsætninger og flertydighed snarere end en evigt fremadskrivende episk fortælling. Artiklen er en forkortet udgave af kapitel 5 i Canclinis bog fra 1989: "Culturas Hibridas - Estrategias para entrat y salir de la modernidad. Mexico: Grijalbo.

  19. Events i den globale bykonkurrence

    DEFF Research Database (Denmark)

    Østergaard, Katrine

    2005-01-01

    Paper til ph.d. workshop, d. 9. december 2005. Dette paper beskriver, hvorfor og hvordan events kan bruges som strategi for byplanlægning og byudvikling i den globale bykonkurrence.......Paper til ph.d. workshop, d. 9. december 2005. Dette paper beskriver, hvorfor og hvordan events kan bruges som strategi for byplanlægning og byudvikling i den globale bykonkurrence....

  20. Den Blå Drage

    DEFF Research Database (Denmark)

    Ingerslev, Gitte Holten

    Denne publikation i serien Læselyst tjener tre formål. Den evaluerer læseprojektet Den blå drage i efteråret 2004 på Byskolen i Svendborg ? et projekt ledet af forfatteren Josefine Ottesen. Desuden gøres der rede for nogle af de teorier der støtter og begrunder arbejdsmåde og resultater i projektet...

  1. Den Blå Drage

    DEFF Research Database (Denmark)

    Ingerslev, Gitte Holten

    Denne publikation i serien Læselyst tjener tre formål. Den evaluerer læseprojektet Den blå drage i efteråret 2004 på Byskolen i Svendborg ? et projekt ledet af forfatteren Josefine Ottesen. Desuden gøres der rede for nogle af de teorier der støtter og begrunder arbejdsmåde og resultater i projektet...

  2. Den tidslogiske analyse af determinismeproblemet

    DEFF Research Database (Denmark)

    Øhrstrøm, Peter

    2010-01-01

    Artiklen diskuterer den filosofiske tidslogik med særligt henblik på A.N. Priors bidrag hertil. Det logiske determinismeproblem benyttes som gennemgående eksempel. Det vises endvidere, hvordan tidslogikken kan udnyttes til at analysere de logisk mulige positioner i en videnskabelig eller videnska...... videnskabsteoretisk debat. Her bruges den videnskabshistorisk betydende diskussion mellem Charles Darwin og Asa Gray som eksempel....

  3. Den litterære blog

    DEFF Research Database (Denmark)

    Serup, Martin Glaz; Kromann, Thomas Hvid

    2012-01-01

    Hvad er en litterær blog og hvordan arbejder den som en aktiv del af den litterære offentlighed.......Hvad er en litterær blog og hvordan arbejder den som en aktiv del af den litterære offentlighed....

  4. Ny bog: Den farvede franske general

    DEFF Research Database (Denmark)

    Østergaard, Uffe

    2013-01-01

    Anmeldelse af: Tom Reiss: 'Den sorte greve. Napoleons rival og den virkelige greve af Monte Cristo', Informations Forlag, 517 s.......Anmeldelse af: Tom Reiss: 'Den sorte greve. Napoleons rival og den virkelige greve af Monte Cristo', Informations Forlag, 517 s....

  5. Polar Bears or People?: How Framing Can Provide a Useful Analytic Tool to Understand & Improve Climate Change Communication in Classrooms

    Science.gov (United States)

    Busch, K. C.

    2014-12-01

    Not only will young adults bear the brunt of climate change's effects, they are also the ones who will be required to take action - to mitigate and to adapt. The Next Generation Science Standards include climate change, ensuring the topic will be covered in U.S. science classrooms in the near future. Additionally, school is a primary source of information about climate change for young adults. The larger question, though, is how can the teaching of climate change be done in such a way as to ascribe agency - a willingness to act - to students? Framing - as both a theory and an analytic method - has been used to understand how language in the media can affect the audience's intention to act. Frames function as a two-way filter, affecting both the message sent and the message received. This study adapted both the theory and the analytic methods of framing, applying them to teachers in the classroom to answer the research question: How do teachers frame climate change in the classroom? To answer this question, twenty-five lessons from seven teachers were analyzed using semiotic discourse analysis methods. It was found that the teachers' frames overlapped to form two distinct discourses: a Science Discourse and a Social Discourse. The Science Discourse, which was dominant, can be summarized as: Climate change is a current scientific problem that will have profound global effects on the Earth's physical systems. The Social Discourse, used much less often, can be summarized as: Climate change is a future social issue because it will have negative impacts at the local level on people. While it may not be surprising that the Science Discourse was most often heard in these science classrooms, it is possibly problematic if it were the only discourse used. The research literature on framing indicates that the frames found in the Science Discourse - global scale, scientific statistics and facts, and impact on the Earth's systems - are not likely to inspire action-taking. This

  6. Der kommer den danske model

    DEFF Research Database (Denmark)

    Lundquist, Lita Sander; Gravier, Magali

    2016-01-01

    Alene en titel som »Humor i EU« er nok til at fremkalde smil og spørgsmål om, hvorvidt det virkelig kan være rigtigt. I den grad forekommer det som en selvmodsigelse, at der skulle findes humor i Europaparlamentet (EP).......Alene en titel som »Humor i EU« er nok til at fremkalde smil og spørgsmål om, hvorvidt det virkelig kan være rigtigt. I den grad forekommer det som en selvmodsigelse, at der skulle findes humor i Europaparlamentet (EP)....

  7. Flensborg den 24. maj 1943

    DEFF Research Database (Denmark)

    Thomsen, Merete Bo

    2014-01-01

    Et bombardement af Flensborg 19. maj 1943 kostede mange ofre på både tysk og dansk side. Artiklen sammenligner det danske mindretals begravelsesceremoni med den nazistiske med særligt vægt på de forskellige indslags signalværdi over for det omgivende samfund.......Et bombardement af Flensborg 19. maj 1943 kostede mange ofre på både tysk og dansk side. Artiklen sammenligner det danske mindretals begravelsesceremoni med den nazistiske med særligt vægt på de forskellige indslags signalværdi over for det omgivende samfund....

  8. 西安曲江海洋科普世界极地馆(北极熊馆)索杆体系--钢索施工控制%Cable-strut System in Xi'an Qujiang Ocean Science World Polar Museum (Museum if Polar Bear)-- Wire Rope Construction Control

    Institute of Scientific and Technical Information of China (English)

    张义; 马欢; 张国; 刘宗云

    2014-01-01

    This project shows polar animals from al-dimen-sional, multi-angle through the underwater water two parts, where the polar bear museum is the core part. The top polar bears museum is hooded membrane structure, the pre-stress wire rope design and construction control are the points of this project.%本工程通过水下展示和水上展示两部分,多角度、全方位展示极地动物,其中北极熊馆是核心部分。北极熊馆顶部为正连帽膜结构,在设计施工过程中有关钢索预应力的设计施工控制是本工程的难点。

  9. den og morderen

    DEFF Research Database (Denmark)

    Hansen, Kim Toft

    2014-01-01

    forskellige versioner af Forbrydelsen: DR's oprindelige udgave, AMC's udgave The Killing og David Hewsons roman Forbrydelsen, der er baseret på manuskriptet til DR-serien. Grundfortællingen under disse tre versioner relaterer jeg til H.C. Andersens "Historien om en Moder" og tilskrivningen af mening til døden....

  10. Udstillingen og den gode historie

    DEFF Research Database (Denmark)

    Dickson, Thomas

    1998-01-01

    Artiklen indledes med: af de mange kommunikaationsformaer der findes er 'udstillingen' blandt de mest levende og realistiske. Udstillingsmediet giver publikum mulighed for at opleve 'the real thing' og ikke bare en eller anden form for todimensionel reproduktion. Men den traditionelle udstilling ...

  11. Tillid i den finansielle sektor

    DEFF Research Database (Denmark)

    Rimmer, Nina Røhr; Nielsen, Sara Møller; Benediktsdottir, Elisabet

    2014-01-01

    , der er i kommunikation med kunden, eksempelvis at videreudvikle på definerede Touch-Points i CEM og opbyggelsen/vedligeholdelsen af kundeoplysninger i CRM systemer således, at den samlede kvalitet af ydelsen bliver så personlig som mulig, hvilket falder godt i tråd med Spar Nords værdigrundlag om dels...

  12. Dens in dente of maxillary third molar

    Directory of Open Access Journals (Sweden)

    Subramaniam Arun

    2008-01-01

    Full Text Available ′Dens in dente,′ also known as dens invaginatus, is a developmental anomaly resulting from deepening or invagination of the enamel organ into the dental papilla, which begins at the crown and often extends to the root before calcification of the dental tissues. Dens in dente commonly occur in the maxillary lateral incisor. This article reports a case of dens in dente in the maxillary third molar.

  13. Vi kan bryde den negative kulturelle arv

    DEFF Research Database (Denmark)

    Pecseli, Benedicta

    2014-01-01

    Den ny bekendtgørelse for pædagoguddannelsen fokuserer på brydning af den negative sociale arv, men det som inklusionspædagogikken skal inkludere til, eller den horisont inden for hvilken alle børn skal gives lige livschance/mulighed, er der næsten ingen redegørelse for. Begreber som Kultur og...

  14. den på glas

    DEFF Research Database (Denmark)

    Meyer, Ion

    2008-01-01

    Artiklen beskriver den eneste danske samling af præparerede fostre og børn, og hvorfor den blev fremstillet. Den var en del af Museum Saxtorphianum og artiklen diskuterer hvordan disse fostre blev til præparater. Musealiseringen, overgangen fra medicinske studieobjekter til museumsgenstande med s...

  15. Da den moderne jazz kom til Danmark

    DEFF Research Database (Denmark)

    Høyer, Ole Izard; Nielsen, Anders H.U.

    som tog over, deriblandt Erik Moseholm, Bent Axen og Jørn Elniff. Denne bog forklarer, hvordan den moderne jazz kom til Danmark, og hvordan den udviklede det danske jazzmiljø. Den inddrager faktorer som udenlandske musikeres besøg, koncerter og efterfølgende jazzsessions. Hvilken betydning havde disse...... for den danske jazzudvikling? Hvor blev musikken spillet, og hvordan blev den behandlet af medierne og af samfundet? Sammen med beskrivelser af de vigtigste moderne jazzmusikere fra perioden, analyseres og beskrives en række indspilninger af moderne dansk jazz for at undersøge hvornår, og hvilke af de nye...

  16. Da den moderne jazz kom til Danmark

    DEFF Research Database (Denmark)

    Høyer, Ole Izard; Nielsen, Anders H.U.

    som tog over, deriblandt Erik Moseholm, Bent Axen og Jørn Elniff. Denne bog forklarer, hvordan den moderne jazz kom til Danmark, og hvordan den udviklede det danske jazzmiljø. Den inddrager faktorer som udenlandske musikeres besøg, koncerter og efterfølgende jazzsessions. Hvilken betydning havde disse...... for den danske jazzudvikling? Hvor blev musikken spillet, og hvordan blev den behandlet af medierne og af samfundet? Sammen med beskrivelser af de vigtigste moderne jazzmusikere fra perioden, analyseres og beskrives en række indspilninger af moderne dansk jazz for at undersøge hvornår, og hvilke af de nye...

  17. Filmretorik og den internationale politik

    Directory of Open Access Journals (Sweden)

    Astrid Söderbergh Widding

    2005-09-01

    Full Text Available Med baggrund i de seneste års krigs- og terrorhandlinger – Afghanistan, Irak, den 11. september – reflekterer forfatteren over forholdet mellem krig, tilskuer, medier og forestillinger om virkeligheden. Forholdet mellem medier og virkelighed tenderer ifølge forfatteren mod at smelte sammen i en gennemmedieret kultur, hvor fremstillingsformer fra for eksempel film kan anvendes til at formidle faktiske begivenheder. Forfatterens blik på mediekulturen tager afsæt i flere aktuelle udgivelser fra postmodernis- mens centrale filosoffer, blandt andet Jean Baudrillard og Paul Virilio. Denne artikel er dermed samtidig en introduktion til deres refleksioner over terrorhandlingerne den 11. september og deres betydning i det moderne samfund.

  18. Filmretorik og den internationale politik

    Directory of Open Access Journals (Sweden)

    Astrid Söderbergh Widding

    2005-09-01

    Full Text Available Med baggrund i de seneste års krigs- og terrorhandlinger – Afghanistan, Irak, den 11. september – reflekterer forfatteren over forholdet mellem krig, tilskuer, medier og forestillinger om virkeligheden. Forholdet mellem medier og virkelighed tenderer ifølge forfatteren mod at smelte sammen i en gennemmedieret kultur, hvor fremstillingsformer fra for eksempel film kan anvendes til at formidle faktiske begivenheder. Forfatterens blik på mediekulturen tager afsæt i flere aktuelle udgivelser fra postmodernis- mens centrale filosoffer, blandt andet Jean Baudrillard og Paul Virilio. Denne artikel er dermed samtidig en introduktion til deres refleksioner over terrorhandlingerne den 11. september og deres betydning i det moderne samfund.

  19. Den sociale fantasilegs forandrende potentialer

    DEFF Research Database (Denmark)

    Winther-Lindqvist, Ditte Alexandra

    2014-01-01

    kapitlet argumenterer for en legebaseret pædagogisk tilgang og de voksnes vigtige rolle for børns leg i børnehaven. forskellige former for leg præsenteres og sammenhæng med førskolebarnets udvikling. den sociale fantasileg i børnehaven præsenteres ud fra analysen af en seksuelt overskridende leg ...

  20. Den sociale tillid i Danmark

    DEFF Research Database (Denmark)

    Anhøj, Anne Iversen; Kjærsgård, Andreas Pihl

    2013-01-01

    Nærværende artikel har anvendt de hidtil ubenyttede surveypaneldata, der eksisterer i Danmark til at undersøge udviklingen i social tillid på individniveau over tid. Artiklens analyser viser, at social tillid på individniveau i Danmark synes at være meget stabil, når først den er opnået. Herudover...

  1. Etikken i den maskerede by

    DEFF Research Database (Denmark)

    Liebst, Lasse Suonperä

    2009-01-01

    , at Knud E. Løgstrups fænomenologiske nærhedsetik – som Bauman fejlagtigtjævnfører med Levinas’ – tilbyder en interessant alternativ forståelse af forholdetimellem æstetik og etik: Ifølge Løgstrup har æstetikken nemlig forrang foretikken. Artiklens afgørende argument bliver i lyset heraf, at den etiske...

  2. Reformerne i den offentlige sektor

    DEFF Research Database (Denmark)

    Pedersen, John Storm

    Der er gennemført mere end 15 reformer i den offentlige sektor på få år. Disse analyseres i bogen med udgangspunkt i følgende tre spørgsmål. Reformernes konsekvenser for produktionen og leveringen af velfærdsydelserne til borgerne? Årsagen til og drivkraften bag reformerne? Reformernes krav til d...

  3. Seasonal variability in physicochemical characteristics of small water bodies across a High Arctic wetland, Polar Bear Pass, Bathurst Island, Nunavut, Canada

    Science.gov (United States)

    Abnizova, A.; Miller, E.; Shakil, S.; Young, K. L.

    2012-12-01

    Small water bodies (lakes, ponds) in permafrost environments make up roughly half of the total area of surface water, but their relevance to nutrient and carbon fluxes on a landscape scale still remains largely unknown. Small variations in pond water balance as a result of seasonal changes in precipitation, evaporation, or drainage processes have the potential to produce considerable changes in the carbon and nutrient budgets as small changes in the water level can have a major effect on volumes and surface areas of ponds. The aims of this study were (1) to identify the main characteristics in pond hydrology both seasonally and between years; (2) to identify factors controlling variation in measured physicochemical variables; and (3) to detect seasonal trends in the hydrological and chemical characteristics of ponds located in an extensive low-gradient High Arctic wetland. We conducted detailed limnological surveys of 50 wetland ponds located at Polar Bear Pass (PBP), Bathurst Island, Nunavut, Canada during 2007-2010. The results indicate large seasonal variability in physicochemical parameters that is associated with pond water budget changes, especially for ponds with steady water levels vs. dynamic ponds (fluctuating water levels). Principal component analysis (PCA) of the datasets indicated that major ion content, specifically calcium (Ca2+), was responsible for much of the variability among the ponds in both 2008 and 2009. Additionally in 2009 most of the variability was also due to specific conductivity in the summer and magnesium (Mg2+) in the fall. These trends are typically identified as a result of dilution or evapo-concentration processes in small water bodies. In 2007, a warm and dry year, pH and potassium (K+) were responsible for much of variation between ponds. This is attributed to high vegetation growth in ponds and a longer growing season. While no trend was identified in 2010 (PCA analysis), calculations of greenhouse gas (GHG) emissions from 50

  4. The fur of mammals in exposed environments; do crypsis and thermal needs necessarily conflict? The polar bear and marsupial koala compared.

    Science.gov (United States)

    Dawson, Terence J; Webster, Koa N; Maloney, Shane K

    2014-02-01

    The furs of mammals have varied and complex functions. Other than for thermoregulation, fur is involved in physical protection, sensory input, waterproofing and colouration, the latter being important for crypsis or camouflage. Some of these diverse functions potentially conflict. We have investigated how variation in cryptic colouration and thermal features may interact in the coats of mammals and influence potential heat inflows from solar radiation, much of which is outside the visible spectral range. The coats of the polar bear (Ursus maritimus) and the marsupial koala (Phascolarctus cinereus) have insulative similarities but, while they feature cryptic colouration, they are of contrasting colour, i.e. whitish and dark grey. The reflectance of solar radiation by coats was measured across the full solar spectrum using a spectroradiometer. The modulation of incident solar radiation and resultant heat flows in these coats were determined at a range of wind speeds by mounting them on a heat flux transducer/temperature-controlled plate apparatus in a wind tunnel. A lamp with a spectral distribution of radiation similar to the solar spectrum was used as a proxy for the sun. Crypsis by colour matching was apparent within the visible spectrum for the two species, U. maritimus being matched against snow and P. cinereus against Eucalyptus forest foliage. While reflectances across the full solar spectrum differed markedly, that of U. maritimus being 66 % as opposed to 10 % for P. cinereus, the heat influxes from solar radiation reaching the skin were similar. For both coats at low wind speed (1 m s(-1)), 19 % of incident solar radiation impacted as heat at the skin surface; at higher wind speed (10 m s(-1)) this decreased to approximately 10 %. Ursus maritimus and P. cinereus have high and comparable levels of fur insulation and although the patterns of reflectance and depths of penetrance of solar radiation differ for the coats, the considerable insulation limited the

  5. The role of diet on long-term concentration and pattern trends of brominated and chlorinated contaminants in western Hudson Bay polar bears, 1991-2007

    Energy Technology Data Exchange (ETDEWEB)

    McKinney, Melissa A., E-mail: melissaamckinney@gmail.com [Ecotoxicology and Wildlife Health Division, Science and Technology Branch, Environment Canada, Carleton University (Raven Road), Ottawa, Ontario K1A 0H3 (Canada); Department of Chemistry, Carleton University, Ottawa, Ontario K1S 5B6 (Canada); Stirling, Ian; Lunn, Nick J. [Wildlife Research Division, Science and Technology Branch, Environment Canada, 5320 122 Street, Edmonton, Alberta T6H 3S5 (Canada); Peacock, Elizabeth [Department of Environment, Government of Nunavut, Igloolik, Nunavut X0A 0L0 (Canada); Letcher, Robert J., E-mail: robert.letcher@ec.gc.ca [Ecotoxicology and Wildlife Health Division, Science and Technology Branch, Environment Canada, Carleton University (Raven Road), Ottawa, Ontario K1A 0H3 (Canada); Department of Chemistry, Carleton University, Ottawa, Ontario K1S 5B6 (Canada)

    2010-11-15

    Adipose tissue was sampled from the western Hudson Bay (WHB) subpopulation of polar bears at intervals from 1991 to 2007 to examine temporal trends of PCB and OCP levels both on an individual and sum-({Sigma}-)contaminant basis. We also determined levels and temporal trends of emerging polybrominated diphenyl ethers (PBDEs), hexabromocyclododecane (HBCD), polybrominated biphenyls (PBBs) and other current-use brominated flame retardants. Over the 17-year period, {Sigma} DDT (and p,p'-DDE, p,p'-DDD, p,p'-DDT) decreased (-8.4%/year); {alpha}-hexachlorocyclohexane ({alpha}-HCH) decreased (-11%/year); {beta}-HCH increased (+ 8.3%/year); and {Sigma} PCB and {Sigma} chlordane (CHL), both contaminants at highest concentrations in all years (> 1 ppm), showed no distinct trends even when compared to previous data for this subpopulation dating back to 1968. Some of the less persistent PCB congeners decreased significantly (-1.6%/year to -6.3%/year), whereas CB153 levels tended to increase (+ 3.3%/year). Parent CHLs (c-nonachlor, t-nonachlor) declined, whereas non-monotonic trends were detected for metabolites (heptachlor epoxide, oxychlordane). {Sigma} chlorobenzene, octachlorostyrene, {Sigma} mirex, {Sigma} MeSO{sub 2}-PCB and dieldrin did not significantly change. Increasing {Sigma} PBDE levels (+ 13%/year) matched increases in the four consistently detected congeners, BDE47, BDE99, BDE100 and BDE153. Although no trend was observed, total-({alpha})-HBCD was only detected post-2000. Levels of the highest concentration brominated contaminant, BB153, showed no temporal change. As long-term ecosystem changes affecting contaminant levels may also affect contaminant patterns, we examined the influence of year (i.e., aging or 'weathering' of the contaminant pattern), dietary tracers (carbon stable isotope ratios, fatty acid patterns) and biological (age/sex) group on congener/metabolite profiles. Patterns of PCBs, CHLs and PBDEs were correlated with

  6. Konsulenten i den anden nat

    DEFF Research Database (Denmark)

    Kirkegaard, Line

    for i sit deres liv og den eksistensmåde, der hermed muliggøres. Med dette ønsker jeg at bidrage til de eksisterende work-life balance teorier. Min vej ind i teorierne er nemlig, at logikken i mit empiriske materiale forekommer så forskelligt fra de traditionelle work-life balance teorier, at disse ikke...... lader sig forene. Jeg foretage derfor en analyse af den eksisterende litteratur, og rejser i den forbindelse en grundlæggende kritik af work-life balance teorierne, for at operere med falske problemstillinger på en måde, så svaret allerede indgår i de spørgsmål, der stilles. Jeg argumenterer således for......, at det problematiske forhold ved work-life balance teorierne allerede skal søges i konstitueringen af deres problematik, hvor arbejde og fritid indgår som to distinkte og kontrasterende sfærer. Ubalance eller problemer søges således altid i relationen her imellem. I forlængelse heraf argumenterer jeg for...

  7. Konsulenten i den anden nat

    DEFF Research Database (Denmark)

    Kirkegaard, Line

    for i sit deres liv og den eksistensmåde, der hermed muliggøres. Med dette ønsker jeg at bidrage til de eksisterende work-life balance teorier. Min vej ind i teorierne er nemlig, at logikken i mit empiriske materiale forekommer så forskelligt fra de traditionelle work-life balance teorier, at disse ikke...... lader sig forene. Jeg foretage derfor en analyse af den eksisterende litteratur, og rejser i den forbindelse en grundlæggende kritik af work-life balance teorierne, for at operere med falske problemstillinger på en måde, så svaret allerede indgår i de spørgsmål, der stilles. Jeg argumenterer således for......, at det problematiske forhold ved work-life balance teorierne allerede skal søges i konstitueringen af deres problematik, hvor arbejde og fritid indgår som to distinkte og kontrasterende sfærer. Ubalance eller problemer søges således altid i relationen her imellem. I forlængelse heraf argumenterer jeg for...

  8. Are organohalogen contaminants a bears (Ursus maritimus)?

    DEFF Research Database (Denmark)

    Sonne, Christian; Dietz, Rune; Leifsson, PS

    2006-01-01

    Tissues of polar bears (Ursus maritimus) from East Greenland contain the highest concentrations of organohalogen contaminants (OHCs) among subpopulations of any mammalian species in the Arctic. Negative associations also have been found between OHC concentrations and bone mineral density and liver...... histology parameters for this subpopulation of polar bears. The present study examined the OHC concentrations and adverse effects on renal tissue for 75 polar bears collected during 1999 to 2002. Specific lesions were diffuse glomerular capillary wall thickening, mesangial glomerular deposits, tubular...

  9. Permanent-Magnet Meissner Bearing

    Science.gov (United States)

    Robertson, Glen A.

    1994-01-01

    Permanent-magnet meissner bearing features inherently stable, self-centering conical configuration. Bearing made stiffer or less stiff by selection of magnets, springs, and spring adjustments. Cylindrical permanent magnets with axial magnetization stacked coaxially on rotor with alternating polarity. Typically, rare-earth magnets used. Magnets machined and fitted together to form conical outer surface.

  10. Berlusconi og den moderne fyrste

    DEFF Research Database (Denmark)

    Sørensen, Gert

    Da Berlusconi dannede sin første regering tilbage i 1994, gav han indtryk af at repræsentere noget tiltrængt nyt, efter den gamle korruptionsramte politiske klasse havde måttet trække sig. Dette billede har ændret sig markant siden, men alligevel blev han valgt igen i 2001, hvor han dannede den...... anden Berlusconi-regering. Ved valget i 2006 var det lige ved at ske igen. Hvad har fået så mange italienere til at støtte Berlusconi? Og hvordan har han formået at fastholde denne støtte? Det er bl.a. disse spørgsmål, bogen prøver at give et svar på. Der er ikke tale om en traditionel biografi om...... Berlusconi. Interessen samler sig om Berlusconi som katalysator for nogle grundlæggende forandringer i italienernes politiske adfærd. Bogen skal ses som en slags tilstandsrapport over en aktuel tidsepoke med rødder tilbage i det Italien, der opstod i 1945 efter fascismens endelige sammenbrud. Bogens første...

  11. Die grossen Physiker und ihre Entdeckungen von den fallenden Körpern zu den Quarks

    CERN Document Server

    Segrè, Emilio

    1998-01-01

    Von Galileo Galilei bis zu Richard Feynman und Murray Gell-Mann - von den fallenden Körpern zu den Quarks: Der Physiknobelpreisträger Emilio Segre hat seine ganz persönliche Geschichte der Physik geschrieben. Er erzählt von den großen Gestalten und deren wichtigen Entdeckungen mit großer Anschaulichkeit und Lebendigkeit.

  12. Forever Young - den norske tv-serie Skam

    DEFF Research Database (Denmark)

    Jerslev, Anne

    2016-01-01

    Hvorfor er det lige, at den norske netbaserede ungdomsserie "Skam" er på alles læber for tiden? Svaret er simpelt: Den er nyskabende og supergod, og den taler til en langt bredere målgruppe end den gruppe af teenagepiger, den er rettet mod....

  13. Kaolin gegen den Gemeinen Birnenblattsauger C. pyri

    OpenAIRE

    Daniel, Claudia; Wyss, Eric

    2005-01-01

    Durch Vorblüteapplikationen mit Kaolin kann der Gemeine Birnenblattsauger das ganze Jahr unter der Schadensschwelle gehalten werden.Da Kaolin für nützliche Insekten nicht toxisch ist und eine vergleichbar gute Wirkung wie die herkömmlichen Insektizide hat, stellt es eine Alternative für den integrierten und den ökologischen Anbau dar.

  14. Den filosofiske præstation

    DEFF Research Database (Denmark)

    Skytte Gørtz, Kim Erik

    Bogen gør op med forestillingen om, at filosoffen er uanvendelig i erhvervslivet. Den udfolder en erhvervsfilosofi og inddrager filosoffer som Kant, Hegel, Kierkegaard, Nietzsche, Heidegger og Deleuze......Bogen gør op med forestillingen om, at filosoffen er uanvendelig i erhvervslivet. Den udfolder en erhvervsfilosofi og inddrager filosoffer som Kant, Hegel, Kierkegaard, Nietzsche, Heidegger og Deleuze...

  15. Normer, holdninger og den individualistiske fejlslutning

    DEFF Research Database (Denmark)

    Harder, Peter

    2012-01-01

    Normer er blevet manet ud af lingvistikken i to omgange inden for de sidste hundrede år: Første gang i forbindelse med den strukturalistiske revolution og anden gang i forbindelse med den postmoderne udvikling i variationslingvistikken. Begge gange er normer blevet anskuet som modsætningen til...

  16. Luftstaub über den Meeren

    DEFF Research Database (Denmark)

    Kacunko, Slavko; Kacunko, Sabine; Gorbushina, Ana

    2013-01-01

    Staub umgibt uns überall und alles wird auch irgendwann zu Staub - ob wir wollen oder nicht. Staub nicht nur zu bekämpfen, sondern zu untersuchen, bildet den Ausgangspunkt zahlreicher Forschungen in den Natur-, Ingenieur- und Kulturwissenschaften. Der vorliegende Band verbindet solche Beiträge au...

  17. Den barokke lov i Kafkas "Processen"

    DEFF Research Database (Denmark)

    Simonsen, Karen-Margrethe

    2011-01-01

    Artiklen diskuterer barokke aspekter af loven hos Kafka, idet den inddrager erkendelser fra den historiske barok, blandt andet dobbeltheden af labyrintisk ornamentik og vertikal magt, og inddrager diskussioner af hhv. Gilles Deleuzes, Jacques Derridas og Tzvetan Todorovs læsninger af Kafka....

  18. Lederens rolle i den innovative praksis

    DEFF Research Database (Denmark)

    Voxted, Søren; Kristensen, Catharina Juul

    Rapporten er afrapportering af forskningsprojektet 'Lederens rolle i den innovative praksis'. Gennem 12 måneder fulgte de tre forfattere ledere syv ledere forskellige steder i den offentlige sektor for at se, hvordan de gennem innovation håndtere de forandringskrav deres respektive organisationer...

  19. koncernbegrebet og tilbudspligtens indtræden

    DEFF Research Database (Denmark)

    Clausen, Nis Jul; sørensen, karsten engsig

    2010-01-01

      Med den nye selskabslov og de hertil knyttede ændringer i værdipapirhandelslovens regler om tilbudspligt har man fastholdt ønsket om parallelitet mellem det selskabsretlige koncernbegreb og kriterierne for tilbudspligtens indtræden. Det drøftes, om koncernbegrebet reelt er overført til tilbudsp...

  20. Den lange vej mod 9. april

    DEFF Research Database (Denmark)

    Clemmesen, Michael Hesselholt

    resultat af en pludselig indskydelse, men den logiske kulmination af årtiers udvikling, hvor Tysklands flåde febrilsk havde søgt veje til at yde et effektivt bidrag til sejren. Også den britiske minering af norsk farvand, der blev gennemført samtidig med at de tyske transporter nærmede sig norske kystbyer...

  1. Jagten på den kloge globaliseringsstrategi

    DEFF Research Database (Denmark)

    Mehlsen, Camilla

    2004-01-01

    Den kloge globaliseringsstrategi har fået et navn: Livslang læring. Men er strategien klog, når den fører til et polariseret arbejdsmarked? Og hvem skal betale for at dygtiggøre folk gennem hele livet? Asterisk har talt med professor Andy Green fra University of London. Udgivelsesdato: December...

  2. Planer for den andens liv II

    DEFF Research Database (Denmark)

    Breumlund, Anne; Hansen, Inger Bruun

    Undersøgelsen viser, hvordan den socialpædagogiske indsats på botilbuddet Højskolebakken skaber forandringer i hveragslivet for en gruppe unge med autisme, som har tillægsdiagnoser, udfordrende adfærd, misbrug eller har udøvet kriminalitet. Anden rapport fra forskningsprojektet: "Den pædagogiske og...

  3. Den barokke lov i Kafkas "Processen"

    DEFF Research Database (Denmark)

    Simonsen, Karen-Margrethe

    2011-01-01

    Artiklen diskuterer barokke aspekter af loven hos Kafka, idet den inddrager erkendelser fra den historiske barok, blandt andet dobbeltheden af labyrintisk ornamentik og vertikal magt, og inddrager diskussioner af hhv. Gilles Deleuzes, Jacques Derridas og Tzvetan Todorovs læsninger af Kafka....

  4. Den positive psykologis videnskabsteori og metode

    DEFF Research Database (Denmark)

    Andersen, Frans Ørsted; Vogel, Jenny

    2010-01-01

    På basis af interview med professor Michael Eid fra Freie Universität i Berlin gives en introduktion til emnet, Den positive psykologis videnskabsteori og metode......På basis af interview med professor Michael Eid fra Freie Universität i Berlin gives en introduktion til emnet, Den positive psykologis videnskabsteori og metode...

  5. Den gode facilitator af refleksionsarbejde

    DEFF Research Database (Denmark)

    Jørgensen, Pia

    2009-01-01

    tværfaglig lektorgruppe fra social og sundhedssektoren.’Learning by doing’, selvevaluering og sparring følger herefter som bud på, hvordan man kan leve op til de tilsyneladende ret utopiske krav til en god facilitator. At kunne skabe det tillidsfulde refleksionsrum og at kunne stille gode...... præsenteres i det følgende afsnit, og forfatteren argumenterer for begrebet facilitator af refleksionsarbejde. Herefter udfoldes rollen som facilitator ifølge Ghay og Lillyman. De har fokus på positive praksisoplevelser og tillidsfulde relationer. Gillie Boltons teoretiske og praktiske referenceramme...... for facilitatorrollen beskrives herefter. Bolton beskriver refleksionsarbejde som en fysisk (ikke ren kognitiv), passioneret (ikke ren intellektuel) kontekstbunden kunstnerisk proces, som kræver flair, stil og intuition. I de følgende afsnit beskrives den gode facilitator af refleksionsarbejde detaljeret af en...

  6. Den kulturelle dimension af virksomhedens internationalisering

    DEFF Research Database (Denmark)

    Langhoff, Tine

    1994-01-01

    at udnytte muligheder i foranderlige og kulturelt set heterogene omgivelser, så de succe kan påvirke og tilpasse sig disse? (2): Hvorledes forsøger virksomheder at håndtere kulturel heterogenitet på deres eksportmarkeder? Undersøgelsen identificerer tre dimensioner i virksomheders strategifastlæggelse, der......Artiklen omhandler den kulturelle dimensions indvirkning på virksomhedens internationalisering og diskuterer mulige internationalisieringsstrategier for virksomheder, der konfronteres med kulturforskelle. Med udgangspunkt i en kritik af den hidtidige forskning på området, hvor det såkaldte psykiske...... er herved, at den kulturelle dimension påvirker virksomheden og dens fortsatte udvikling. En empirisk analyse i den danske fødevarebranche afdækker virksomheders interkulturelle kompetence ved hjælp af to spørgsmål: (1) Hvorledes formår virksomheder med begrænsede ressourcer til deres disposition...

  7. Journal bearing

    Science.gov (United States)

    Menke, John R.; Boeker, Gilbert F.

    1976-05-11

    1. An improved journal bearing comprising in combination a non-rotatable cylindrical bearing member having a first bearing surface, a rotatable cylindrical bearing member having a confronting second bearing surface having a plurality of bearing elements, a source of lubricant adjacent said bearing elements for supplying lubricant thereto, each bearing element consisting of a pair of elongated relatively shallowly depressed surfaces lying in a cylindrical surface co-axial with the non-depressed surface and diverging from one another in the direction of rotation and obliquely arranged with respect to the axis of rotation of said rotatable member to cause a flow of lubricant longitudinally along said depressed surfaces from their distal ends toward their proximal ends as said bearing members are rotated relative to one another, each depressed surface subtending a radial angle of less than 360.degree., and means for rotating said rotatable bearing member to cause the lubricant to flow across and along said depressed surfaces, the flow of lubricant being impeded by the non-depressed portions of said second bearing surface to cause an increase in the lubricant pressure.

  8. Platelet function in brown bear (Ursus arctos compared to man

    Directory of Open Access Journals (Sweden)

    Särndahl Eva

    2010-06-01

    Full Text Available Abstract Background Information on hemostasis and platelet function in brown bear (Ursus arctos is of importance for understanding the physiological, protective changes during hibernation. Objective The study objective was to document platelet activity values in brown bears shortly after leaving the den and compare them to platelet function in healthy humans. Methods Blood was drawn from immobilized wild brown bears 7-10 days after leaving the den in mid April. Blood samples from healthy human adults before and after clopidogrel and acetylsalicylic acid administration served as control. We analyzed blood samples by standard blood testing and platelet aggregation was quantified after stimulation with various agonists using multiple electrode aggregometry within 3 hours of sampling. Results Blood samples were collected from 6 bears (3 females between 1 and 16 years old and from 10 healthy humans. Results of adenosine diphosphate, aspirin, and thrombin receptor activating peptide tests in bears were all half or less of those in humans. Platelet and white blood cell counts did not differ between species but brown bears had more and smaller red blood cells compared with humans. Conclusion Using three different tests, we conclude that platelet function is lower in brown bears compared to humans. Our findings represent the first descriptive study on platelet function in brown bears and may contribute to explain how bears can endure denning without obvious thrombus building. However, the possibility that our findings reflect test-dependent and not true biological variations in platelet reactivity needs further studies.

  9. Den iscenesatte TV-virkelighed

    Directory of Open Access Journals (Sweden)

    Peter Harms Larsen

    1988-08-01

    Full Text Available Dansk TV-historie er der skrevet meget lidt af, og om udviklingen af de forskellige TV-genrer næsten intet. I denne artikel tegner Peter Harms Larden et rids af de seneste 20 års TV-udvikling, hvor der er blevet eks- perimenteret med forskellige hybridformer, som blander fiktion og fakta. Peter Harms Larsen bruger ordet "fiktion" som overbegreb for alle former for medieprodukter, hvor fiktions- og faktaelementer blandes sammen. Både de engelsk inspirerede dramatiserede dokumentarprogrammer (drama-dok og de amerikansk inspirerede dokumentariske dramaer (doku-drama er således faktion, og det er tillige eksperimenterne med at anvende rekonstruktioner i faktaprogrammer, med at bruge faktakoder i fiktionsprogrammer, med at "punke" fortæller-instansen og med at iscene- sætte virkeligheden i form af spontanspil eller som eksperimenter. Især anvendelsen af iscenesat virkelighed mener Peter Harms Larsen er et selvstændigt dansk bidrag til udviklingen af TV-faktionsgenren. Artiklen stammer fra et undervisningsmateriale, som anvendes i Danmarks Radios interne uddannelse. Konklusionerne i den sidste del har derfor et videre perspektiv end de eksempler, som er nævnt i første del. Hele materialet vil senere blive gjort tilgængeligt i bogform udgivet af Danmarks Radios Uddannelsescenter.

  10. Assessment of Brown Bear\\'s (Ursus arctos syriacus Winter Habitat Using Geographically Weighted Regression and Generalized Linear Model in South of Iran

    Directory of Open Access Journals (Sweden)

    A. A. Zarei

    2016-03-01

    Full Text Available Winter dens are one of the important components of brown bear's (Ursus arctos syriacus habitat, affecting their reproduction and survival. Therefore identification of factors affecting the habitat selection and suitable denning areas in the conservation of our largest carnivore is necessary. We used Geographically Weighted Logistic Regression (GWLR and Generalized Linear Model (GLM for modeling suitability of denning habitat in Kouhkhom region in Fars province. In the present research, 20 dens (presence locations and 20 caves where signs of bear were not found (absence locations were used as dependent variables and six environmental factors were used for each location as independent variables. The results of GLM showed that variables of distance to settlements, altitude, and distance to water were the most important parameters affecting suitability of the brown bear's denning habitat. The results of GWLR showed the significant local variations in the relationship between occurrence of brown bear dens and the variable of distance to settlements. Based on the results of both models, suitable habitats for denning of the species are impassable areas in the mountains and inaccessible for humans.

  11. Vrouekarakters in enkele prosawerke van C.M. van den Heever

    Directory of Open Access Journals (Sweden)

    E. Botha

    2003-08-01

    Full Text Available The role of women in some prose works of C.M. van den Heever Re-reading the C.M. van den Heever “classics” Somer (1935 and Laat vrugte (1939 within the framework of Van den Heever criticism through the years, one becomes aware that central themes in his oeuvre are acted out by women. The beautiful young girl Linda in Somer embodies the sadness of the transcience of beauty and happiness. Through Ouma Willa, Betta and Johanna – three women from three generations in Laat vrugte – the theme of the endurance of the memory of love and passion beyond decay and death is expressed. A cursory examination of other and earlier works by Van den Heever – Op die plaas (1927, Langs die grootpad (1928, Kromburg (1937 and the short story “Leuens” (Lies from Vuurvlieg en sterre (1934 – bears out the observation that women express core meanings in C.M. van den Heever’s prose works.

  12. Reform af reformen - den nye ellov

    DEFF Research Database (Denmark)

    Olsen, Ole Jess

    2005-01-01

    Konkurrence i dansk elforsyning blev i første omgang i 1999 kun gennemført halvhjertet. Den miljøvenlige energi blev holdt uden for og selskabsstrukturen låst fast. Det skabte problemer, som den nye lov fra 2004 har søgt at råde bod på.......Konkurrence i dansk elforsyning blev i første omgang i 1999 kun gennemført halvhjertet. Den miljøvenlige energi blev holdt uden for og selskabsstrukturen låst fast. Det skabte problemer, som den nye lov fra 2004 har søgt at råde bod på....

  13. Contemporary treatment of class II dens invaginatus.

    Science.gov (United States)

    Sathorn, C; Parashos, P

    2007-04-01

    To present the nonsurgical management of a tooth with class II dens invaginatus with an open apex utilizing contemporary techniques. Root canal treatment of teeth with complex root canal anatomy such as dens invaginatus can be problematic because infected pulpal tissues may remain in inaccessible areas of the canal system. The cleaning and debridement of such root canal systems are therefore challenging and may sometimes be considered impossible. An immature apical root-end development is another challenge in root canal treatment especially in controlling the apical extent of the filling material and achieving an apical seal. When difficulties in cleaning and filling combine, management options may include surgical intervention or extraction. This article reports the nonsurgical endodontic treatment of a case of an open apex and dens invaginatus utilizing the operating microscope, endodontic ultrasonic instruments and mineral trioxide aggregate. Teeth with class II dens evaginatus and an open apex may be managed successfully with contemporary nonsurgical materials and techniques.

  14. Offene Lizenzen in den Digitalen Geisteswissenschaften

    Directory of Open Access Journals (Sweden)

    Kirsten Süselbeck

    2015-07-01

    Full Text Available Bericht über die vom Münchner Zentrum für digitale Geisteswissenschaften organisierten Tagung „Offene Lizenzen in den Digitalen Geisteswissenschaften“ am 27. und 28. April 2015

  15. Rare associations of dens invaginatus and mesiodens.

    Science.gov (United States)

    Sannomiya, Eduardo Kazuo; Asaumi, Jun-ichi; Kishi, Kanji; Dalben, Gisele da Silva

    2007-08-01

    Dens invaginatus is a developmental variation resulting from an alteration in the normal growth pattern of the dental papilla. Synonyms of this disturbance include dens in dente, invaginated odontome, tooth inclusion, and dentoid in dente. Radiographically, it is observed as infolding of a radiopaque ribbon-like structure, with equal density as enamel, extending from the cingulum into the root canal and sometimes reaching the root apex, assigning the appearance of a small tooth within the coronal pulp cavity. This article presents 2 case reports. The first describes an 8-year-old girl with dens invaginatus in a mesiodens; the second report describes a 16-year-old boy presenting with 2 mesiodens, both associated with dens invaginatus.

  16. Motivation af den Kreative Sælger

    OpenAIRE

    Sørensen, Mikkel Vallentin; Floor, Jeppe Hjelmsted

    2012-01-01

    Projektet tager udgangspunkt i motivationen af danske sælgere. Med inspiration fra den positive psykologiske videnskab, udfordres eksisterende motivationsredskaber, med henblik på at motivere den enkelte medarbejder til at yde et bedre stykke arbejde for virksomheden. Daniel Pink, Bruno Frey og Frederick Herzberg danner det teoretiske grundlag for opgaven, og problemstillingen undersøges gennem en sammenholdelse af deres teorier med empirisk materiale i en fænomenologisk tilgang. Rapporten af...

  17. Planer for den andens liv I

    DEFF Research Database (Denmark)

    Breumlund, Anne; Hansen, Inger Bruun

    Undersøgelsen viser, hvordan den socialpædagogiske indsats på botilbuddet Højskolebakken må udvikles i mødet med en gruppe unge med autisme, som har tillægsdiagnoser, udfordrende adfærd, misbrug eller har udøvet kriminalitet. Første rapport fra forskningsprojektet: "Den pædagogiske og sociale...

  18. Hvorfor al den snak om etik?

    DEFF Research Database (Denmark)

    Hjort, Katrin

    2010-01-01

    Denne artikel handler om pædagogers professionsetik, og om hvordan pædagoger – som andre velfærdsprofessionelle inden for uddannelse, sundhed og socialt arbejde – i dag er spændt ud mellem på den ene side den klassiske velfærdsstats pligtetik, kravet om at give ”alt det bedste til alle”, og på de...

  19. At traversere den Andens fantasi eller at traversere fantasien om den Anden

    DEFF Research Database (Denmark)

    Hansen, Brian Benjamin

    2016-01-01

    Fantasier lærer os at begære, hedder det hos Lacan. De sætter os i kontakt med den Andens begær. Men kan man egentlig komme for tæt på den Anden? Hvad sker der, når man kommer for tæt på den Andens fantasier? Og hvad sker der, når man kommer for tæt på fantasien om den Anden? Disse og lignende...

  20. Læring og den kulturhistoriske skole

    DEFF Research Database (Denmark)

    Broström, Stig

    2007-01-01

      Kapitlet søger at indkredse væsentlige sider ved den kulturhistoriske skoles læringsforståelse. Kapitlet rummer fire afsnit. Det første handler om forholdet mellem læring og udvikling, hvor jeg med afsæt i Vygotskys værker (1978, 1974) og med inspiration fra en række amerikanske Vygotsky......-forskere uddrager den grundlæggende forståelse af forholdet mellem læring og udvikling. Nemlig at læring og udvikling indgår i en dialektisk enhed og virker gensidigt ind på hinanden - dog således at læring kommer ført, den trækker udviklingen med sig og så at sige leder udviklingen. Vygotskys tese vedrørende...... forholdet mellem læring og udvikling, ligger efterfølgende til grund for konstruktionen af tre grundlæggende begreber, der (ifølge den amerikanske Vygotsky-forsker Anna Stetsenko, 1999) udgør Vygotskys og den kulturhistoriske skoles teoretiske læringslandskab: 1) interaktionen mellem barnet og den voksne...

  1. Amerikaniseringen af den danske fagbevægelse

    DEFF Research Database (Denmark)

    Knudsen, Dino

    den amerikanske fagbevægelse der - bistået af CIA - førte an i den internationale kampagne mod kommunismen. Hermed blev danskerne involveret i hemmelige efterretningsoperationer, lyssky pengeoverførsler og var med til at splitte den internationale fagbevægelse. Den danske arbejderbevægelse spillede en...

  2. The three-dimensional numerical solutions of micro-polar-fluid elastohydrodynamic lubrication of bearings%轴承微极流体弹流润滑的三维数值解

    Institute of Scientific and Technical Information of China (English)

    路遵友; 王海群; 马涛

    2015-01-01

    根据润滑理论,考虑弹性变形,推导了轴承微极流体弹流润滑三维问题的Reynolds方程。结合约束条件,利用编程软件分别模拟出了点接触和线接触微极流体弹流润滑条件下的三维数值解,数值结果更加直观形象地呈现了空间三维油膜压力和膜厚的数值分布情况。%According to the theory of lubrication,elastic deformation is considered,and the three-dimensional Reynolds equation for micro-polar-fuild-lubricated bearings is derived. By using the programming software,the three-dimensional numerical solutions of micro-polar-fluid elastohydrodynamic lubrication are given for both point contact and line contact with constraint conditions. The numer-ical results present more intuitionistic spatial distributions of oil film pressure and oil film thickness.

  3. Magnetic Bearing

    Science.gov (United States)

    1996-01-01

    AVCON, Inc. produces advanced magnetic bearing systems for industrial use, offering a unique technological approach based on contract work done at Marshall Space Flight Center and Lewis Research Center. Designed for the turbopump of the Space Shuttle main engine, they are now used in applications such as electric power generation, petroleum refining, machine tool operation and natural gas pipelines. Magnetic bearings support moving machinery without physical contact; AVCON's homopolar approach is a hybrid of permanent and electromagnets which are one-third the weight, smaller and more power- efficient than previous magnetic bearings.

  4. Foil bearings

    Science.gov (United States)

    Elrod, David A.

    1993-01-01

    The rolling element bearings (REB's) which support many turbomachinery rotors offer high load capacity, low power requirements, and durability. Two disadvantages of REB's are: (1) rolling or sliding contact within the bearing has life-limiting consequences; and (2) REB's provide essentially no damping. The REB's in the Space Shuttle Main Engine (SSME) turbopumps must sustain high static and dynamic loads, at high speeds, with a cryogenic fluid as lubricant and coolant. The pump end ball bearings limit the life of the SSME high pressure oxygen turbopump (HPOTP). Compliant foil bearing (CFB) manufacturers have proposed replacing turbopump REB's with CFB's CFB's work well in aircraft air cycle machines, auxiliary power units, and refrigeration compressors. In a CFB, the rotor only contracts the foil support structure during start up and shut down. CFB damping is higher than REB damping. However, the load capacity of the CFB is low, compared to a REB. Furthermore, little stiffness and damping data exists for the CFB. A rotordynamic analysis for turbomachinery critical speeds and stability requires the input of bearing stiffness and damping coefficients. The two basic types of CFB are the tension-dominated bearing and the bending-dominated bearing. Many investigators have analyzed and measured characteristics of tension-dominated foil bearings, which are applied principally in magnetic tape recording. The bending-dominated CFB is used more in rotating machinery. This report describes the first phase of a structural analysis of a bending-dominated, multileaf CFB. A brief discussion of CFB literature is followed by a description and results of the present analysis.

  5. Foil bearings

    Science.gov (United States)

    Elrod, David A.

    1993-11-01

    The rolling element bearings (REB's) which support many turbomachinery rotors offer high load capacity, low power requirements, and durability. Two disadvantages of REB's are: (1) rolling or sliding contact within the bearing has life-limiting consequences; and (2) REB's provide essentially no damping. The REB's in the Space Shuttle Main Engine (SSME) turbopumps must sustain high static and dynamic loads, at high speeds, with a cryogenic fluid as lubricant and coolant. The pump end ball bearings limit the life of the SSME high pressure oxygen turbopump (HPOTP). Compliant foil bearing (CFB) manufacturers have proposed replacing turbopump REB's with CFB's CFB's work well in aircraft air cycle machines, auxiliary power units, and refrigeration compressors. In a CFB, the rotor only contracts the foil support structure during start up and shut down. CFB damping is higher than REB damping. However, the load capacity of the CFB is low, compared to a REB. Furthermore, little stiffness and damping data exists for the CFB. A rotordynamic analysis for turbomachinery critical speeds and stability requires the input of bearing stiffness and damping coefficients. The two basic types of CFB are the tension-dominated bearing and the bending-dominated bearing. Many investigators have analyzed and measured characteristics of tension-dominated foil bearings, which are applied principally in magnetic tape recording. The bending-dominated CFB is used more in rotating machinery. This report describes the first phase of a structural analysis of a bending-dominated, multileaf CFB. A brief discussion of CFB literature is followed by a description and results of the present analysis.

  6. Jamie Oliver i den gode smags tjeneste

    DEFF Research Database (Denmark)

    Leer, Jonatan

    2014-01-01

    klassestereotyper og hierarkier, ligesom den bruges til at legitimere Jamies disciplinering af personer med dårlige madkompetencer, særligt arbejderklassemødre. Der er med andre ord grund til at forholde sig kritisk til strategien i Jamie Olivers opbyggelige kogebogsprojekt og stille spørgsmålet, om ikke kampen i...... den gode sags tjeneste først og fremmest tjener til at skabe et positivt billede af tv-kokken/kogebogsforfatteren som etisk individ (og brand) på bekostning af de gastronomisk nødstedte. Det skal nævnes, at jeg i min læsning af Jamies kogebogs-kampskrift har ladet mig inspirere af den russisk...

  7. Leadership pipeline i den offentlige sektor

    DEFF Research Database (Denmark)

    Dahl, Kristian Aagaard; Molly-Søholm, Thorkil

    en rejse ind i hjertet af offentlig ledelse med fokus på lederniveauerne: topchef, funktionel chef, leder af ledere og leder af medarbejdere. Med afsæt i righoldige eksempler og fortællinger fra virkeligheden introduceres læseren for ledelsesteorien den Offentlige Leadership Pipeline, som giver...... enkelte lederniveauer og udvikle ledertalenter. Teorien byder på et detaljeret ledelsesgrundlag, hvorudfra den offentlige organisation kan bygge en professionel værdikæde for ledelse ved at forme lederprofiler, -rekruttering, -uddannelse, -evaluering m.m. Leadership Pipeline i den offentlige sektor er...... baseret på et treårigt dansk praksisorienteret forskningsprojekt med deltagelse af 15 offentlige organisationer, som repræsenterer kommunerne, regionerne og staten. Projektet har videreudviklet en af de sidste 10 års mest indflydelsesrige ledelseteorier i de største private organisationer, Leadership...

  8. Der westliche Blick auf den Orient

    Directory of Open Access Journals (Sweden)

    Antje Schrupp

    2007-11-01

    Full Text Available Angesichts der aktuellen Debatten über den Islam zeigen Christina von Braun und Bettina Mathes die viele Jahrhunderte alte Interpretationsgeschichte des Orients aus westlicher Perspektive auf. In ihrem materialreichen Band schildern sie die historische und geografische Vielfalt des Phänomens „Islam“ und zeigen, wie westliches Selbstverständnis und Projektionen das Bild des Okzidents vom Orient seit langem und bis heute prägen – auch da, wo man es auf den ersten Blick nicht vermuten würde.

  9. Farvel til globaliseringen som vi kendte den

    DEFF Research Database (Denmark)

    Böss, Michael

    2009-01-01

    Vi er endt med en krise, som rækker langt ud over det globale monetære system, fordi den ideologiske ortodoksi, der skabte den, har ført til udflytning af millioner af arbejdspladser, tæring af nationalstaternes sammenhængskraft og overgreb på naturen. Kronikken refererer bl.a. til John Maynard K...... Keynes og en artikel af økonomen Robert Skidelsky i The American Prospect. Udgivelsesdato: 12. januar 2009...

  10. De frygtsomme og den smalle palet

    DEFF Research Database (Denmark)

    Skude, Flemming

    2003-01-01

    Om den konventionelle modernismes bandlysning af alle farver på nær hvid - og om bl.a. Luis Barragan som et vellykket eksempel på at farver kan bringe arkitektur op i et højere perceptionsniveau.......Om den konventionelle modernismes bandlysning af alle farver på nær hvid - og om bl.a. Luis Barragan som et vellykket eksempel på at farver kan bringe arkitektur op i et højere perceptionsniveau....

  11. Construindo um Densímetro

    OpenAIRE

    Ricetti Rodrigo

    2002-01-01

    Para fins didáticos, é apresentada uma maneira de construir um densímetro, aparelho utilizadopara medir a densidade de fluidos. um aparato fácil de ser construído e muito simples de serutilizado. Sua principal vantagem sobre os densímetros que comercialmente encontramos, é a suacapacidade de medir a densidade de quaisquer líquidos, operando em qualquer faixa de densidade. Outra vantagem que apresenta, é a possibilidade de fazer uma medição relativa entre quaisquerlíquidos, não fazendo apenas ...

  12. Den Unge med Kræft

    DEFF Research Database (Denmark)

    I Den Unge med Kræft beskrives igennem en række artikler et 3-årigt tværfagligt udviklings- og forskningsprojekt på Onkologisk Afdeling D på Århus Universitetshospital. Projektet har involveret mere end 30 fagpersoner fra afdelingens sengeafsnit, ambulatorium, palliative enhed samt afdelingens so...

  13. Robotter – den asymmetriske krigs soldater?

    DEFF Research Database (Denmark)

    Helms, Niels Henrik

    2010-01-01

    Teknologien remedierer krigen. Robotterne er indrulleret i det militære arsenal, som vigtige aktører, men især den asymmetriske krig er en krig om folks hjerter, hvor beslutningstagerne må afveje prisen for indsatsen med nødvendigheden af at være tilstede. Og alle er til stede: robotterne, soldat...

  14. Den drikfældige engel?

    DEFF Research Database (Denmark)

    Eriksen, Sidsel

    1991-01-01

    Artiklen opfatter kvinders særlige drikkemønstre som et udslag af kultur og ikke (blot) som en konsekvens af kvindens særlige biologi. Udgangspunktet er, at drikkeri ikke passer sammen med den traditionelle kvinderolle. Endnu værre er det dog, hvis kvinder drak i offentligheden. Det er formentlig...

  15. Den skrøbelige sandhed

    DEFF Research Database (Denmark)

    Pedersen, Peter Ole

    2010-01-01

    Artiklen retter fokus mod de seneste års udvikling af den aktivistiske dokumentarfilm. Med analytiske punktnedslag hos instruktørerne Michael Moore, Morgan Spurlock, Dylan Avery, Robert Greenwald og Mauro Andrizzi undersøges de forbindelser der eksisterer mellem udtrykket i de populære spillefilm...

  16. Demokratiseringen af den politiske diskurs i Polen

    DEFF Research Database (Denmark)

    Arnfast, Juni Søderberg

    1999-01-01

    Gennem en analyse af brugen af personlige pronominer i politiske tekster fra udvalgte, polske medier diskuteres forandringerne i den polske, politiske diskurs gennem 1980'erne. Det påvises at det kommunistiske styres anvendelse af pronominet 'vi' skifter konnotationer i retning af en mindre ideol...

  17. Den udødelige gangster

    DEFF Research Database (Denmark)

    Bjerre, Thomas Ærvold

    2009-01-01

    Hollywood har igennem et århundrede hyldet de voldspsykopater, som de fleste gangstere nu engang er. Michael Manns Public Enemies er seneste skud på stammen i den lange række af amerikanske gangsterfilm, der tog sin begyndelse i starten af 1930'erne, og som meget hurtig blev til en mytisk...

  18. The Oscars og den klassiske Hollywoodfilm

    DEFF Research Database (Denmark)

    Nielsen, Jakob Isak

    2013-01-01

    Artiklen diskuterer, hvorvidt Oscaruddelingen har været med til at konsolidere de normer og traditioner, der kendetegner den klassiske Hollywoodfilm som et (fortællemæssigt) paradigme. Der tages afsæt i Oscarvindere fra Wings (1927) og frem til It Happened One Night (1934). Artiklen konkluderer...

  19. Den udødelige gangster

    DEFF Research Database (Denmark)

    Bjerre, Thomas Ærvold

    2009-01-01

    Hollywood har igennem et århundrede hyldet de voldspsykopater, som de fleste gangstere nu engang er. Michael Manns Public Enemies er seneste skud på stammen i den lange række af amerikanske gangsterfilm, der tog sin begyndelse i starten af 1930'erne, og som meget hurtig blev til en mytisk...

  20. Flaskevand - den rene vare i brandingens tidsalder

    DEFF Research Database (Denmark)

    Hermansen, Judy

    2008-01-01

    At tappe vand på flasker er blevet den mest udbredte globale virksomhed overhovedet, og forbruget af flaskevand stiger fortsat hurtigt - især i lande hvor man kan få rent drikkevand direkte fra hanen gratis eller til en meget billig penge. Hvorfor er vi havnet i sådan et tilsyneladende paradoksal...

  1. De Pretertiaire Historie van den Indischen Archipel

    NARCIS (Netherlands)

    Umbgrove, J.H.F.

    1935-01-01

    Aan de hand van een serie kaartjes wordt in deze studie gepoogd de ontwikkeling van den Indischen Archipel — verspreiding van land en zee, faciesgebieden, tijden van transgressies, plooiingsperiodes etc. — in pretertiairen tijd voor zoover mogelijk na te gaan. Bij het vermelden van feiten en van lit

  2. Evidensbaseret viden i den klinske sygepleje

    DEFF Research Database (Denmark)

    Andres, Emilie Marie; Larsen, Bente Malig

    2008-01-01

    University College Lillebælt, Sygeplejerskeuddannelsen i Svendborg og Odense har i efteråret 2007 og foråret 2008 arbejdet med projekt ’Uddannelse af kliniske vejledere i anvendelse af evidensbaseret viden i den kliniske sygepleje’. Projektet slutter efter planen i efteråret 2008. Projektet går ud...

  3. Den professionelle kommunikations renæssance

    Directory of Open Access Journals (Sweden)

    Niels Chr. Nielsen

    1993-09-01

    Full Text Available Mens hovedparten af den nyere PR-litteratur bevæger sig "på kommu- nikations niveau", og blot beskriver fremtidens virksomhedskommuni- kation i forhold til fortidens og nutidens kommunikationsformer, så gra- ver Niels Chr. Nielsen i denne artikel et par spadestik dybere. Han beskriver kort den igangværende erhvervsstrukturelle og teknologiske udvikling og trækker dernæst paralleller til kravene til virksomhedernes professionelle kommunikationsarbejde. Det er hans tese, at den tekno- logiske og erhvervsstukturelle udvikling ikke, som ofte påstået, fører til mere og mere sofistikeret manipulation med modtagerne; tværtimod vil det der ske en forskydning i argumentets og den ægte dialogs retning. Niels Chr. Nielsen, der er cand.mag i filosofi og idehistorie, skriver fra en position som udviklingsdirektør ved Dansk Teknologisk Institut. Artiklen er et bearbejdet oplæg fra konferencen "Excellent Public Relations", 18. marts 1993.

  4. Den fragmentariske by og det 'gode byliv'

    DEFF Research Database (Denmark)

    Pløger, J.

    Gennem en række betragtninger på bylivets værdier og normer, de bymæssige livsformer og livsstile udleder forfatteren, at den danske by- og boligplanlægning ikke i tilstrækkelig grad afspejler 'de ægte byborgeres' identifikation med bylivet og deres krav til bomiljøet. Mange singler, studerende, ...

  5. - den bedste, troeste og smukkeste Lighed

    DEFF Research Database (Denmark)

    Vejlby, Anna Schram

    Afhandlingen fortolker C.W. Eckersbergs portrætter ud fra formelle, filosofiske og sociale synsvinkler. Afhandlingen bevæger sig fra samfund til subjekt, fra ydre omstændigheder til indre rørelser, fra overordnede europæiske strømninger inden for kunst og filosofi til den subjektive oplevelse af...

  6. Portræt: Den koreanske dansker

    DEFF Research Database (Denmark)

    Henriksen, Carsten

    2009-01-01

    Lene Myong Petersen har som den første i Danmark skrevet ph.d.-afhandling om adoption. Og ifølge Lene Myong Petersen er det belastede begreb om race ikke til at slippe uden om, hvis man vil forstå vilkårene for adopterede i Danmark....

  7. Tre teorier om den moralske udvikling

    DEFF Research Database (Denmark)

    Bo, Inger Glavind; Andreasen, Brian Kjær

    I artiklen gennemgås tre forskellige men teorihistorisk relaterede perspektiver på forståelsen af moralsk udvikling: Piaget, Kohlberg og Gilligan. I den efterfølgende diskussion af disse teoretikeres respektive positioner påpeges såvel forskelle som ligheder i deres betoning af moralens karakter...

  8. Hjernerum - Den følelsesfulde hjerne

    DEFF Research Database (Denmark)

    Kringelbach, Morten L.

    Learning Lab Denmark/Peoples Press, Copenhagen. 2004 Kort beskrivelse: 'Hjernerum' er en fortælling fra hjerneforskningens frontlinie om de nyeste indsigter i den følelsesfulde hjerne. Med udgangspunkt i egen forskning og historisk indsigt i alt fra videnskabs- til litteratur- og kunsthistorie, t...

  9. Dr. Bakhuizen van den Brink retires

    NARCIS (Netherlands)

    Kalkman, C.

    1976-01-01

    On 11 September 1976 dr. Reinier Cornelis Bakhuizen van den Brink will reach the age of 65 and so he must retire from his position as a senior botanist at the Rijksherbarium. He has worked in our institute since December 1943, after having obtained his doctor’s degree in Utrecht. At the Rijksherbari

  10. Hydrodynamic bearings

    CERN Document Server

    Bonneau, Dominique; Souchet, Dominique

    2014-01-01

    This Series provides the necessary elements to the development and validation of numerical prediction models for hydrodynamic bearings. This book describes the rheological models and the equations of lubrication. It also presents the numerical approaches used to solve the above equations by finite differences, finite volumes and finite elements methods.

  11. Christian Birch - den korrupte konferensråd

    DEFF Research Database (Denmark)

    Jensen, Mette Frisk

    2005-01-01

      http://www.sidensaxo.dk/fileadmin/saxo-abstract-uploads/christian_birch_den_korrupte_konferensraad_2005_3.pdf......  http://www.sidensaxo.dk/fileadmin/saxo-abstract-uploads/christian_birch_den_korrupte_konferensraad_2005_3.pdf...

  12. Opera til folket? - Den Jyske Opera 70 år

    DEFF Research Database (Denmark)

    Bonde, Lars Ole

    2017-01-01

    Introduktion til Den Jyske Operas 70 års jubilæumsforestilling og programnoter til samtlige numre.......Introduktion til Den Jyske Operas 70 års jubilæumsforestilling og programnoter til samtlige numre....

  13. Den første kunsthistorie var romersk

    DEFF Research Database (Denmark)

    Isager, Jacob Erik

    2013-01-01

    Plinius den Ældres afsnit om skulptur og maleri som inspiration for senere kunsthistorier og kunstnere......Plinius den Ældres afsnit om skulptur og maleri som inspiration for senere kunsthistorier og kunstnere...

  14. Opera til folket? - Den Jyske Opera 70 år

    DEFF Research Database (Denmark)

    Bonde, Lars Ole

    2017-01-01

    Introduktion til Den Jyske Operas 70 års jubilæumsforestilling og programnoter til samtlige numre.......Introduktion til Den Jyske Operas 70 års jubilæumsforestilling og programnoter til samtlige numre....

  15. Hepatische Effekte von Wachstumshormon auf den Glukosestoffwechsel

    Directory of Open Access Journals (Sweden)

    Rufinatscha K

    2015-01-01

    Full Text Available Untherapierter Wachstumshormonmangel im Erwachsenenalter (AGHD ist mit viszeraler Adipositas, Dyslipidämie, Insulinresistenz und Fettleber verbunden. Interessanterweise finden sich viele der AGHD-Merkmale auch bei Patienten mit metabolischem Syndrom. Die nichtalkoholische Fettlebererkrankung (NAFLD gilt als hepatische Manifestation des metabolischen Syndroms. In einigen Studien wurden bei Patienten mit NAFLD verminderte Konzentrationen von zirkulierendem IGF-1, dessen Synthese zu einem großen Teil durch Wachstumshormon (GH reguliert wird, beschrieben. Mäuse, welche eine hepatische Wachstumshormondefizienz aufweisen, zeigen zahlreiche phänotypische Charakteristika des metabolischen Syndroms, unter anderen auch eine Fettlebererkrankung. Dies legt einen Zusammenhang zwischen dem Wachstumshormon und der Entstehung einer NAFLD nahe. Ziel unserer Studie ist es, in einem Zellkulturmodell die Effekte des Wachstumshormons auf den intrazellulären Glukosestoffwechsel näher zu untersuchen. Im Detail sollen Auswirkungen einer verminderten Wachstumshormonrezeptorexpression auf den Insulinsignaltransduktionsweg, den Glykogengehalt und auf Schlüsselenzyme der Glukoneogenese untersucht werden. Präliminäre Daten zeigen, dass eine verminderte Wachstumshormonrezeptorexpression mit intrazellulären Veränderungen des hepatischen Glukosestoffwechsels verbunden ist. Die verminderte Insulinsensitivität könnte auf Alterationen im Insulinsignaltransduktionsweg und Änderungen der Glukoneogenese zurückzuführen sein. Diese präliminären Daten weisen darauf hin, dass Wachstumshormon einen direkten Einfluss auf den Glukosestoffwechsel in der Leber hat. Zudem legen sie nahe, dass Veränderungen im Wachstumshormonstoffwechsel einen wichtigen pathophysiologischen Mechanismus in der Entstehung der Fettlebererkrankung bei Patienten mit metabolischem Syndrom darstellen könnten. Der folgende Artikel soll einen kurzen Überblick über die Effekte von Wachstumshormon

  16. Adaptation of the hindlimbs for climbing in bears.

    Science.gov (United States)

    Sasaki, Motoki; Endo, Hideki; Wiig, Oystein; Derocher, Andrew E; Tsubota, Toshio; Taru, Hajime; Yamamoto, Masako; Arishima, Kazuyoshi; Hayashi, Yoshihiro; Kitamura, Nobuo; Yamada, Junzo

    2005-04-01

    The hindlimbs of the Malayan sun bear (Helarctos malayanus), the polar bear (Ursus maritimus), the brown bear (Ursus arctos) and the giant panda (Ailuropoda melanoleuca) have been anatomically and osteometrically studied. The Musculus tibialis cranialis of the Malayan sun bear and the giant panda possessed a well-developed rich fleshy portion until the distal end of the tibia. In the polar bear and the brown bear, however, the fleshy portion of the M. tibialis cranialis was not developed until the distal end of the tibia. The tendon of the M. tibialis cranialis inserting on the proximal end of the Ossa metatarsalia was shorter in the Malayan sun bear and the giant panda than in the polar bear and the brown bear. In the Malayan sun bear and the giant panda, moreover, the M. popliteus was attached more distally to the tibia than in the polar bear and the brown bear. The stable dorsiflexion and supination of the foot and the efficient pronation of the crus are important for skillful tree climbing. The present study suggests that the Malayan sun bear and the giant panda have hindlimbs especially adapted to tree climbing by the well-developed fleshy portion of the M. tibialis cranialis reaching the distal end of the tibia, its short tendon, and the M. popliteus inserting near the distal end of the tibia.

  17. Premolarized double dens in dente in albinism - A case report

    Directory of Open Access Journals (Sweden)

    Suprabha B

    2005-09-01

    Full Text Available Dens in dente are known to be associated with many dental abnormalities such as taurodontism microdontia, gemination, and dens evaginatus. This paper describes a rare case of double dens in dente in a lateral incisor with crown morphology similar to a premolar present in a patient with features of albinism. Problems associated with this condition and their management is discussed.

  18. Det lille land før den store krig

    DEFF Research Database (Denmark)

    Clemmesen, Michael Hesselholt

    Krige i Nordafrika og på Balkan. Den Store Krig truede. Den tyske marine brugte danske farvande som sine egne, men den unge, aggressive britiske marineminister Churchill ville nu presse sin flåde ind i Kattegat, uden hensyn til dansk og svensk neutralitet, i risikable operationer, der kunne udløse...

  19. Den Europæiske Union som liberalistisk medborgerprojekt

    DEFF Research Database (Denmark)

    Agustin, Lise Rolandsen

    2005-01-01

    Den Europæiske Union (EU) befinder sig i en ufrivillig tænkepause efter den franske afvisning af Traktaten om en forfatning for Europa ved folkeafstemningen den 20. maj 2005. Det er således tid til at reflektere over, hvori det europæiske samarbejde består i dag, og over, hvorledes det kan eller ...

  20. Bibemærkninger til den kognitive kapitalisme

    DEFF Research Database (Denmark)

    Petersen, Lars Axel

    2009-01-01

    Med den franske økonom Yann Moulier-Boutangs vision om pollensamfundet sættes viden - og ikke mindst vores forståelse af vidensarbejderen - i et nyt lys. Lars Axel Pedersen analyserer, med Marx under den ene arm og Lyotard under den anden, forestillingen om de fritsvævende og altbestøvende...

  1. [Von den Restgütern zu den Sowchosen in Estland 1939-1953. Dokumentensammlung] / Olev Liivik

    Index Scriptorium Estoniae

    Liivik, Olev, 1975-

    2011-01-01

    Arvustus: Von den Restgütern zu den Sowchosen in Estland 1939-1953 : Dokumentensammlung / Hrsg. von David Feest, Karsten Brüggemann. Berlin : Lit Verlag, 2010. (Schriften der Baltischen historischen Kommission ; Bd. 15)

  2. [Von den Restgütern zu den Sowchosen in Estland 1939-1953. Dokumentensammlung] / Olev Liivik

    Index Scriptorium Estoniae

    Liivik, Olev, 1975-

    2011-01-01

    Arvustus: Von den Restgütern zu den Sowchosen in Estland 1939-1953 : Dokumentensammlung / Hrsg. von David Feest, Karsten Brüggemann. Berlin : Lit Verlag, 2010. (Schriften der Baltischen historischen Kommission ; Bd. 15)

  3. Arzneimitteltherapie: Relevante Interaktionen und (negative Effekte auf den Knochen

    Directory of Open Access Journals (Sweden)

    Woschnagg H

    2003-01-01

    Full Text Available Dieses Review ist das Ergebnis einer Medline-Recherche. Demnach erscheinen die Auswirkungen der Genußgifte Alkohol, Nikotin und Kaffee auf den Knochen eher nachteilig zu sein. Nicht gering ist die Anzahl der Medikamente, die den Vitamin D-Stoffwechsel beeinflussen. Eine Androgenentzugstherapie beeinflußt den Knochenstoffwechsel negativ, Thyroxin hat diesen Effekt nur in einer deutlich suppressiv wirksamen Dosierung. Protonenpumpenhemmer verbessern die Resorption der Bisphosphonate sehr, Hydrochlorothiazide verhindern den renalen Kalziumverlust. Manche Statine und intermittierend verabreichte Nitrate scheinen ebenfalls günstige Auswirkungen auf den Knochen zu haben.

  4. Stephen Schwartz og den folkelige lyd

    DEFF Research Database (Denmark)

    Kreutzfeldt, Jacob

    2013-01-01

    Stephen Schwartz døde i foråret 2013. I denne artikel forsøger Jacob Kreutzfeldt, der gennemførte en række interviews med Schwartz gennem hans sidste år, at indkredse den æstetiske grundholdning, der prægede hans arbejde med radiomontagen i DR.......Stephen Schwartz døde i foråret 2013. I denne artikel forsøger Jacob Kreutzfeldt, der gennemførte en række interviews med Schwartz gennem hans sidste år, at indkredse den æstetiske grundholdning, der prægede hans arbejde med radiomontagen i DR....

  5. Stephen Schwartz og den folkelige lyd

    DEFF Research Database (Denmark)

    Kreutzfeldt, Jacob

    2013-01-01

    Stephen Schwartz døde i foråret 2013. I denne artikel forsøger Jacob Kreutzfeldt, der gennemførte en række interviews med Schwartz gennem hans sidste år, at indkredse den æstetiske grundholdning, der prægede hans arbejde med radiomontagen i DR.......Stephen Schwartz døde i foråret 2013. I denne artikel forsøger Jacob Kreutzfeldt, der gennemførte en række interviews med Schwartz gennem hans sidste år, at indkredse den æstetiske grundholdning, der prægede hans arbejde med radiomontagen i DR....

  6. Den Digital Kirkegårdskultur

    DEFF Research Database (Denmark)

    Sabra, Jakob Borrits

    2016-01-01

    , politiske og funktionelle dimensioner. Det for- udsætter et overblik over digitale fænomener og tendenser indenfor medieringer af døden i den danske kirkegårds- og mindekultur. Jeg vil således først give eksempler på, hvor- dan digitale teknologier og sociale medier kommer til udtryk i denne sammenhæng, og...... (primært vestlige) forskningslitteratur på området, vil jeg i denne artikel argumentere for, at kirkegården også har en voksende digital dimension, der kræver opmærk- somhed, holdningsudveksling og stillingtagen på samme vis som stedets religiøse, sekulære, æstetiske, sociale, kulturelle, historiske...

  7. Studie af den amerikanske doktrin for Counterinsurgency

    DEFF Research Database (Denmark)

    Møller, Nicolai Stahlfest

    2006-01-01

    strategisk partner, og den mulige indsættelse i missioner, hvor kontakt med, og måske bekæmpelse af, fjendtlige oprørsbevægelser vil forekomme. Maos teori og den nyere radikale islams teori ses som værende repræsentative for oprørsbevægelser ift. både amerikanske erfaringer og det forventede danske...... synes også at være udtalt i imødegåelsen af radikal islam, hvilket er en stor udfordring for både militære og civile myndigheder og organisationer. For at fungere som COIN enhed kræver det veluddannede enheder, da de udover de basale soldateropgaver også skal kunne støtte ifm. CIMIC opgaver, løsning af...

  8. Den danske fødevaresektor

    DEFF Research Database (Denmark)

    Bosselmann, Aske Skovmand; Gylling, Morten

    2012-01-01

    Den danske fødevaresektor har et højt niveau for så vidt angår miljø og bæredygtighed. Der kan være et potentiale for vækst og beskæftigelse i at bruge dette relativt høje niveau til at give danske virksomheder adgang til attraktive eksportmarkeder, hvor fødevarer, der er dokumenteret bæredygtige...

  9. Optimisation of profits; Den Gewinn optimieren

    Energy Technology Data Exchange (ETDEWEB)

    Seltmann, T.

    1998-09-01

    In spite of the new taxation regulations for photovoltaic energy conversion systems, operators of PV systems can make profits. The contribution presents concrete examples. (orig.) [Deutsch] Durch den Verzicht auf die Kleinunternehmerregelung wird der Betreiber einer PV-Anlage zwar umsatzsteuerpflichtig. Wie dargestellt wird, kann er trotzdem auf Dauer einen Gewinn erwirtschaften. In diesem Beitrag wird anhand konkreter Beispiele erlaeutert, was der Betreiber tun muss, um seinen Anlagenertrag steuerlich korrekt und moeglichst gewinnbringend beim Fiskus anzugeben. (orig.)

  10. Den kontraktstyrede og kontraktstyrende offentlige sektor

    DEFF Research Database (Denmark)

    Schulze, Christiane; Greve, Carsten

    for levering af en service eller et produkt (Domberger 1998:12). Kontrakter er dog ikke bare en entydig formel aftale, der forstås på samme måde af enhver aktør. Tværtimod er kontrakter også afhængige af læsernes perspektiv såvel som omgivelsens normer, traditioner og legale rammer. Den er derved ikke...

  11. Open Access og Den Bibliometriske Forskningsindikator

    DEFF Research Database (Denmark)

    Dorch, Bertil

    2011-01-01

    I sine "Anbefalinger til implementering af Open Access i Danmark" foreslår det nationale Open Access Udvalget blandet andet, at Den Bibliometriske Forskningsindikator (BFI) bør koordineres med en national Open Access-politik. I dette paper, der er baseret på et blogindlæg, fremfører forfatteren...... fire grunde til, hvorfor han synes det er en dårlig idé at koble Open Access til BFI....

  12. Den gode præsentation

    DEFF Research Database (Denmark)

    Greve, Linda

    Den gode præsentation giver det teoretiske fundament og de praktiske værktøjer, der skal til for at skabe gode præsentationer, der virker efter hensigten. Læren er, at gode præsentationer kommer af grundig og metodisk velovervejet forberedelse – og af modet til at gå i relation med lytterne. Bogen...

  13. Open Access og Den Bibliometriske Forskningsindikator

    DEFF Research Database (Denmark)

    Dorch, Bertil

    2011-01-01

    I sine "Anbefalinger til implementering af Open Access i Danmark" foreslår det nationale Open Access Udvalget blandet andet, at Den Bibliometriske Forskningsindikator (BFI) bør koordineres med en national Open Access-politik. I dette paper, der er baseret på et blogindlæg, fremfører forfatteren...... fire grunde til, hvorfor han synes det er en dårlig idé at koble Open Access til BFI....

  14. Globale Entwikclung als Lernbereich in den Naturwissenschaften

    OpenAIRE

    Härtig, Hendrik; Bernholt, Sascha; Schroeter, Burkhard

    2014-01-01

    Mit dem Orientierungsrahmen für den Lernbereich Globale Entwicklung wurden Anregungen gegeben, die Themen nachhaltige Entwicklung und globale Entwicklung im Unterricht in allen Schulfächern aufzugreifen. Die drei naturwissenschaftlichen Schulfächer Biologie, Chemie und Physik haben sich bislang sehr unterschiedlich auf das Thema eingelassen. In der Biologiedidaktik finden sich sowohl Forschungsarbeiten als auch Unterrichtsvorschläge; für Chemie und insbesondere Physik existieren hingegen nur ...

  15. Construindo um Densímetro

    Directory of Open Access Journals (Sweden)

    Ricetti Rodrigo

    2002-01-01

    Full Text Available Para fins didáticos, é apresentada uma maneira de construir um densímetro, aparelho utilizadopara medir a densidade de fluidos. um aparato fácil de ser construído e muito simples de serutilizado. Sua principal vantagem sobre os densímetros que comercialmente encontramos, é a suacapacidade de medir a densidade de quaisquer líquidos, operando em qualquer faixa de densidade. Outra vantagem que apresenta, é a possibilidade de fazer uma medição relativa entre quaisquerlíquidos, não fazendo apenas a medição relativa à densidade da água. Desta maneira, pode-semedir, por exemplo, a densidade do mercúrio em relação ao éter, com este instrumento. Nota-seque, desta maneira, com apenas um instrumento determina-se a densidade de qualquer líquido, nãosendo necessário dispor-se de densímetros que operem em diversas faixas de densidade, como é ocaso dos instrumentos encontrados comercialmente.

  16. Simultaneous Occurrence of Dens Invaginatus and Fusion

    Directory of Open Access Journals (Sweden)

    Amit Mhapuskar

    2013-01-01

    Full Text Available Although Dens invaginatus and fusion are well-known and well established dental anomalies, they are rarely seen in supernumerary teeth. In this article, simultaneous occurrence of Dens invaginatus and fusion between maxillary lateral incisor and a supernumerary tooth is described. Dens invaginatus is clinically significant due to the possibility of the pulpal involvement; pulpitis, necrotic pulps and chronic periapical lesions are often associated with this anomaly without clinical symptoms. Fusion has a negative impact on the aesthetics, especially when it occurs in maxillary anterior teeth. It is difficult to clinically make differential diagnosis between fused teeth and geminated teeth, especially when these anomalies take place together with hypodontia or supernumerary tooth. It has been found that sequel of such teeth may result in delayed eruption, ectopic eruption or even impaction of permanent teeth; hence proper diagnosis by clinical and radiographic methods and intervention at appropriate time is of paramount importance. The accurate knowledge of variations in morphology of tooth and pulp cavity greatly assists the dentist in planning successful treatment options.

  17. Polar bears, eskimos and indie music

    DEFF Research Database (Denmark)

    Otte, Andreas Roed

    2013-01-01

    Visse kunstnere og bands fra Grønland gør brug af et grønlandsk nation-brand i forsøg på at differentiere sig på det internationale musikmarked. Ved at se på forskellige strategier til at co-brande musik sammen med Grønland som nation, undersøger denne artikel hvordan grupperne Nive Nielsen and t...

  18. Dens evaginatus and dens invaginatus in a double tooth: A rare case report

    Directory of Open Access Journals (Sweden)

    Gaurav Sharma

    2015-01-01

    Full Text Available The presence of dens invaginatus (DI and dens evaginatus (DE on same tooth is a rare phenomenon. However, when these dental anomalies occur on a double tooth, it becomes an extremely rare phenomenon. The authors report a rare case of DI and DE on fused permanent maxillary central incisor with supernumerary tooth in a 40-year-old male. The present article also focuses on the differentiating fusion from gemination and also reviews preventive and management strategies for tooth with complex dental anatomy.

  19. Control of multicellular development by the physically interacting deneddylases DEN1/DenA and COP9 signalosome.

    Directory of Open Access Journals (Sweden)

    Martin Christmann

    Full Text Available Deneddylases remove the ubiquitin-like protein Nedd8 from modified proteins. An increased deneddylase activity has been associated with various human cancers. In contrast, we show here that a mutant strain of the model fungus Aspergillus nidulans deficient in two deneddylases is viable but can only grow as a filament and is highly impaired for multicellular development. The DEN1/DenA and the COP9 signalosome (CSN deneddylases physically interact in A. nidulans as well as in human cells, and CSN targets DEN1/DenA for protein degradation. Fungal development responds to light and requires both deneddylases for an appropriate light reaction. In contrast to CSN, which is necessary for sexual development, DEN1/DenA is required for asexual development. The CSN-DEN1/DenA interaction that affects DEN1/DenA protein levels presumably balances cellular deneddylase activity. A deneddylase disequilibrium impairs multicellular development and suggests that control of deneddylase activity is important for multicellular development.

  20. Finansiell risikostyring i den amerikanske flybransjen

    OpenAIRE

    Orleanski, Anna Karolina; Schulte, André Evensen

    2010-01-01

    Denne oppgaven tar for seg finansiell risikostyring i den amerikanske flybransjen, med hovedfokus på sikring av drivstoff. Drivstoff har historisk stått for 20-30 prosent av flyselskapenes driftskostnader, og høy volatilitet i drivstoffprisen gjør at mange sikrer råvaren. Vi undersøker om finansiell risikostyring bidrar til økt selskapsverdi, med hovedfokus på drivstoffprissikring, men inkluderer også valuta- og rentesikring der det er mulig. Studien baseres på offentlig selskapsinformasjon f...

  1. Den teoretiske udvikling af Supply Chain Strategimodeller

    DEFF Research Database (Denmark)

    Arvad Johansen, Jens

    2011-01-01

    Denne artikel beskriver med udgangspunkt i artikler og virksomhedseksempler udviklingen inde for supply chain strategimodeller. Ved hjælp af tidligere udviklede koncepter besvares spørgsmålet: “Hvad er den rette supply chain for mine produkter?”. Virksomhedseksempler beskriver, hvordan supply chain...... segmentering via postponement-princippet, har givet mærkbare forbedringer. Det beskrives endvidere, hvordan produkternes livscyklus påvirker valget af supply chain design. Begrebet Demand Chain Management( DCM), hvormed strategimodeller bruger klassiske marketingelementer sammen med Supply Chain Management...

  2. Zu den on Emona und Ljubljana

    Directory of Open Access Journals (Sweden)

    Jaroslav Šašel

    1984-12-01

    Full Text Available Die Bildungssilbe -ona wurde in übernommenen ON von den Slawen regelmässig auf -in umgebildet (Salona-Solin. Dieser Gruppe wird vom Autor auch die Form Atamine beigezählt (für Emona, Anon. Ravenn. 4.20, die infolge einer Diskontinuität in Vergessenheit geriet. Im Bereich derselben Siedlungsstelle taucht später der ON Ljubljana auf, dessen Bildungssilbe -ana (wie in ON Fažana, Sežana auf lokales Bestehen eines sprachlich vorslawischen Elements hindeutet. Lit. und Beispiele s. im Text oben.

  3. Den danske FN-bataljon i den ikke anerkendte stat Republika Srpska Krajina, 1992-1995

    DEFF Research Database (Denmark)

    Brink Rasmussen, Jakob

    2014-01-01

    Artiklen beskriver og analyserer en dansk FN-styrkes erfaringer med fredsbevarende operationer i forbindelse med Kroatiens løsrivelse fra det tidligere Jugoslavien. Den følger de næste års konflikt med de etniske serbere, som i perioden 1992-1995 forsøgte at opbygge og fastholde deres egen stat i...

  4. Foothills model forest grizzly bear study : project update

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2002-01-01

    This report updates a five year study launched in 1999 to ensure the continued healthy existence of grizzly bears in west-central Alberta by integrating their needs into land management decisions. The objective was to gather better information and to develop computer-based maps and models regarding grizzly bear migration, habitat use and response to human activities. The study area covers 9,700 square km in west-central Alberta where 66 to 147 grizzly bears exist. During the first 3 field seasons, researchers captured and radio collared 60 bears. Researchers at the University of Calgary used remote sensing tools and satellite images to develop grizzly bear habitat maps. Collaborators at the University of Washington used trained dogs to find bear scat which was analyzed for DNA, stress levels and reproductive hormones. Resource Selection Function models are being developed by researchers at the University of Alberta to identify bear locations and to see how habitat is influenced by vegetation cover and oil, gas, forestry and mining activities. The health of the bears is being studied by researchers at the University of Saskatchewan and the Canadian Cooperative Wildlife Health Centre. The study has already advanced the scientific knowledge of grizzly bear behaviour. Preliminary results indicate that grizzlies continue to find mates, reproduce and gain weight and establish dens. These are all good indicators of a healthy population. Most bear deaths have been related to poaching. The study will continue for another two years. 1 fig.

  5. Konservatismen og den højreradikale terror

    DEFF Research Database (Denmark)

    2011-01-01

    Den norske højreekstremist Anders Behring Breiviks terror mod det norske samfund har herhjemme ledt til en voldsom debat om blandt andet forbindelsen mellem tonen i debatten og terrorangrebet og forholdet mellem den siden 2001 meget omtalte kulturkonservatisme og Anders Breiviks terrorhandling....... Essayet Konservatismen og den højreradikale terror forsøger dels at skabe klarhed over fronterne i debatten, dels at rette en kritik mod såvel tendensen til at afskrive handlingen som uforståelig som af tendensen til at slå den bredere højrefløjs kritik af multikulturalismen i hartkorn med Breiviks...

  6. Diagnoseforsinkelser i almen praksis II: Dilemmaer i den diagnostiske proces

    DEFF Research Database (Denmark)

    Wentzer, Helle Sofie; Andersen, Rikke Sand; Bundgaard, Henning

    2016-01-01

    Sundhedspolitisk er der fokus på diagnoseforsinkelser. Det er der også i forskningen og i klinisk praksis. Artiklen er den anden af to, der ser på diagnoseforsinkelser og de overvejelser og dilemmaer, der indgår i den diagnostiske proces. Mens den første artikel fokuserede på forsinkelsesskabende....... Workshoppen tog afsæt i to patientcases med diagnoseforsinkelser med henblik på at ”trigge” deltagernes erfaringer med strukturelle problematikker i egen praksis. Resultatet er en beskrivelse af en række dilemmaer i den diagnostiske proces....

  7. Mozart, Karl Barth, og den kristne troslæren

    DEFF Research Database (Denmark)

    Petersen, Nils Holger

    2010-01-01

    En diskussion af Karl Barths teologiske brug af W.A.Mozart i den kirchliche Dogmatik med kontekstuel inddragelse af en til en vis grad tilsvarende overordnet diskussion af Mozart, skrevet af en samtidig musiker, den fremtrædende Mozart-dirigent Ferenc Fricsay. ......En diskussion af Karl Barths teologiske brug af W.A.Mozart i den kirchliche Dogmatik med kontekstuel inddragelse af en til en vis grad tilsvarende overordnet diskussion af Mozart, skrevet af en samtidig musiker, den fremtrædende Mozart-dirigent Ferenc Fricsay. ...

  8. Konservatismen og den højreradikale terror

    DEFF Research Database (Denmark)

    2011-01-01

    Den norske højreekstremist Anders Behring Breiviks terror mod det norske samfund har herhjemme ledt til en voldsom debat om blandt andet forbindelsen mellem tonen i debatten og terrorangrebet og forholdet mellem den siden 2001 meget omtalte kulturkonservatisme og Anders Breiviks terrorhandling....... Essayet Konservatismen og den højreradikale terror forsøger dels at skabe klarhed over fronterne i debatten, dels at rette en kritik mod såvel tendensen til at afskrive handlingen som uforståelig som af tendensen til at slå den bredere højrefløjs kritik af multikulturalismen i hartkorn med Breiviks...

  9. Digital kommunikation med den offentlige sektor

    DEFF Research Database (Denmark)

    Berger, Jesper Bull; Andersen, Kim Normann

    til. I denne undersøgelse sættes der fokus på myndighedernes besvarelse af den digitale post. Digital post blev bl.a. etableret som et alternativ til almindelig e-mail for at det offentlige kan kommunikere med borgere og virksomheder på en sikker måde, dvs. uden at uvedkommende kan få adgang til...... følsomme oplysninger. Fokus for undersøgelsen er hvordan håndterer myndighederne besvarelserne i den digitale postkasse: svarer de på digital post og e-mail, hvor hurtigt svarer de og er svarene brugbare? Undersøgelsen medtager myndighedernes besvarelse af digital post og e-mail, dels for at kunne...... sammenligne de to digitale kanaler og for at kunne sammenligne med en tidligere undersøgelse af digital kommunikation med det offentlige. Herudover er der tidligere gennemført en undersøgelse af e-mail svar og svartider i New Zealand og Australien. De danske resultater fra e-mail undersøgelsen, men ikke...

  10. Digital kommunikation med den offentlige sektor

    DEFF Research Database (Denmark)

    Berger, Jesper Bull; Andersen, Kim Normann

    digital postkasse, som borgerne kunne skrive til. I denne undersøgelse sættes der fokus på myndighedernes besvarelse af den digitale post. Digital post blev bl.a. etableret som et alternativ til almindelig e-mail for at det offentlige kan kommunikere med borgere og virksomheder på en sikker måde, dvs....... uden at uvedkommende kan få adgang til følsomme oplysninger. Fokus for undersøgelsen er hvordan håndterer myndighederne besvarelserne i den digitale postkasse: svarer de på digital post og e-mail, hvor hurtigt svarer de og er svarene brugbare? Vi har også undersøgt besvarelse af e-mail, dels...... for at kunne sammenligne de to digitale kanaler og for at kunne sammenligne med en tidligere undersøgelse af digital kommunikation med det offentlige. Herudover er der tidligere gennemført en undersøgelse af e-mail svar og svartider i New Zealand og Australien. De danske resultater fra e-mail undersøgelsen...

  11. Digital kommunikation med den offentlige sektor

    DEFF Research Database (Denmark)

    Berger, Jesper; Andersen, Kim Normann

    2013-01-01

    til. I denne undersøgelse sættes der fokus på myndighedernes besvarelse af den digitale post. Digital post blev bl.a. etableret som et alternativ til almindelig e-mail for at det offentlige kan kommunikere med borgere og virksomheder på en sikker måde, dvs. uden at uvedkommende kan få adgang til...... følsomme oplysninger. Fokus for undersøgelsen er hvordan håndterer myndighederne besvarelserne i den digitale postkasse: svarer de på digital post og e-mail, hvor hurtigt svarer de og er svarene brugbare? Undersøgelsen medtager myndighedernes besvarelse af digital post og e-mail, dels for at kunne...... sammenligne de to digitale kanaler og for at kunne sammenligne med en tidligere undersøgelse af digital kommunikation med det offentlige. Herudover er der tidligere gennemført en undersøgelse af e-mail svar og svartider i New Zealand og Australien. De danske resultater fra e-mail undersøgelsen, men ikke...

  12. 78 FR 70515 - Petition To Promulgate Standards for Bears Under the Animal Welfare Act Regulations

    Science.gov (United States)

    2013-11-26

    ... pigs and hamsters, rabbits, nonhuman primates, and marine mammals (including polar bears), and subpart... handling, treatment, and care of bears, and do not address the complex and unique behavioral, dietary,...

  13. Anaïs Nin, pornografien og den kvinnelige seksualiteten

    OpenAIRE

    Tronvold, Gry Olsen

    2010-01-01

    Denne studien tar for seg Anaïs Nins samlinger Delta of venus (1977) og Little Birds (1979) I lys av Sigmund Freud argumenterer jeg for at Nins pornografi er metapornografi, som belyser problematiske aspekter ved den kvinnelige seksualiteten. Slik finner jeg belegg for at Nins samlinger er skjønnlitterære og dermed bryter med den konvensjonelle pornografien.

  14. Tegnets tid. Fortid, historie og historicitet efter den sproglige vending

    DEFF Research Database (Denmark)

    Simonsen, Dorthe Gert

    historieskrivningens sandhedsfordring. Her ud fra forskydes det snævre fokus på tegn, tekst og diskurs i den aktuelle historieteoretiske debat til spørgsmål om tid og “radikal historicitet”. Der indhentes eksempler fra nyere kulturhistorisk forskning, især fra den amerikanske New Historicism....

  15. Margaret Thatcher og afslutningen på Den Kolde Krig

    DEFF Research Database (Denmark)

    Sevaldsen, Jørgen

    2010-01-01

    Gennemgang af den britiske premierminister (1979-1990) Margaret Thatchers rolle i forbindelse med Murens fald i 1989. Med dansk perspektiv.......Gennemgang af den britiske premierminister (1979-1990) Margaret Thatchers rolle i forbindelse med Murens fald i 1989. Med dansk perspektiv....

  16. Den Ontologiske Vending i Antropologi og Science and Technology Studies

    DEFF Research Database (Denmark)

    Winthereik, Brit Ross

    2015-01-01

    Formålet med artiklen er at afsøge, hvad videnskabs- og teknologi- studier eller Science and Technology Studies (STS) tilbyder humaniora og samfundsvidenskaberne med det nybrud, der er blevet kaldt den ontologiske vending. Med udgangspunkt i en beskrivelse af den onto- logiske vending i antropologi...

  17. Kvinder og mænd i den offentlige sektor

    DEFF Research Database (Denmark)

    Madsen, Mikkel Bo; Holt, Helle; Jonassen, Anders Bruun

    Denne rapport handler om de karriereveje, som mænd og kvinder følger i forskellige dele af den offentlige sektor, og de karriereveje, de opfatter som mulige. Undersøgelsen viser blandt andet, at mænd overalt i den offentlige sektor er tydeligt overrepræsenteret i lederstillinger. Desuden viser de...

  18. Mephisto vor den Richtern – Mephisto before the judges

    Directory of Open Access Journals (Sweden)

    Czarnikow Marie

    2014-08-01

    Full Text Available Mephisto before the judges: The Mephisto trials – how the reader was discovered, and then denied any decision‐making capacity Mephisto vor den Richtern – Von der Entdeckung zur Entmündigung des Lesers in den Mephisto‐Prozessen

  19. Samarbejdets betydning i den ’klassiske udlicitering’

    DEFF Research Database (Denmark)

    Lindholst, Andrej Christian

    2015-01-01

    Hvilken betydning har ’samarbejde’ i kontraktstyringen mellem offentlige myndigheder og private entreprenører inden for de ’klassiske’ udbudsområder? I både den administrative praksis og den politologiske litteratur betragtes en effektiv anvendelse af udlicitering på de klassiske udbudsområder of...

  20. Den alimentære kode - Centralbrasilien, Israel, Helvede

    DEFF Research Database (Denmark)

    Jensen, Hans Jørgen Lundager

    2006-01-01

    Den alimentære kode som centralt antropologisk emne hos Claude Lévi-Strauss og i gammeltestamentlig og senere kristen mytologi......Den alimentære kode som centralt antropologisk emne hos Claude Lévi-Strauss og i gammeltestamentlig og senere kristen mytologi...

  1. Laika – den første hund i rummet

    DEFF Research Database (Denmark)

    Alstrup, Aage Kristian Olsen

    2013-01-01

    DETTE ER DEN FØRSTE ARTIKEL I EN SERIE OM FORSØGSDYRENES ROLLE I RUMFORSKNINGEN. DYRENE SPILLEDE EN CENTRAL ROLLE I RUSSERNES OG AMERIKANERNES RUMKAPLØB UNDER DEN KOLDE KRIG. I DAG BRUGES DYRENE TIL MEDICINSKE FORSØG UDFØRT I VÆGTLØS TILSTAND. FØRSTE ARTIKEL HANDLER OM GADEKRYDSET LAIKA, SOM BLEV...

  2. Empirisme, rationalisme og den moralske følelse

    DEFF Research Database (Denmark)

    Nielsen, Carsten Fogh

    2003-01-01

    Sammenlignende diskussion af David Humes og Immanuel Kants syn på følelsernes rolle for den moralske dom......Sammenlignende diskussion af David Humes og Immanuel Kants syn på følelsernes rolle for den moralske dom...

  3. Synteserapport & 1. Indenrigspolitiske forhold i Den Islamiske Republik Iran

    DEFF Research Database (Denmark)

    Pedersen, Claus Valling

    Rapport til Udenrigsministeriet om de indenrigspolitiske forhold i Iran samt et syntese af hele rapporten: Iran som regional og international medspiller i den globale verdensorden samt Irans indenrigspolitik......Rapport til Udenrigsministeriet om de indenrigspolitiske forhold i Iran samt et syntese af hele rapporten: Iran som regional og international medspiller i den globale verdensorden samt Irans indenrigspolitik...

  4. Wider den Skeptizismus Contrary to Skepticism

    Directory of Open Access Journals (Sweden)

    Kathrin Hönig

    2005-03-01

    Full Text Available Die feministische Wissenschaftskritik leide seit einiger Zeit unter einer problematischen erkenntnistheoretischen Wende; so lautet die Diagnose von Sharyn Clough. Dabei verfehle sie ihr eigentliches Geschäft, nämlich die Kritik wissenschaftlicher Praxis. Die Konzentration auf erkenntnistheoretische Fragen rufe außerdem einen globalen Skeptizismus auf den Plan, der sich verheerend auf die Glaubwürdigkeit feministischer Erkenntnisansprüche auswirke. Mit einem antirepräsentationalistischen Ansatz soll diesem Problem begegnet werden.Feminist scientific criticism has been suffering for some time under a problematic turn to cognitive theory; such is Sharyn Clough’s diagnosis. The criticism thereby falls short of its actual task: the critique of scientific praxis. In addition, the concentration on questions of cognitive theory makes global skepticism the order of the day, which disastrously affects the believability of feminist cognitive claims. This problem is to be tackled with an anti-representational approach.

  5. Den digitale pædagoguddannelse

    DEFF Research Database (Denmark)

    Pilgaard, Michal; Rasmussen, Jan Erik Røjkjær; Ahm, Jacob Noer

    2016-01-01

    Udviklingsprojektet ”Den digitale pædagoguddannelse” er en samlebetegnelse for en række delprojekter, der alle er udført på tværs af udbudsstederne af pædagoguddannelsen i VIA i 2015. Fælles for projekterne er, at de indeholder konkrete erfaringer med at inddrage digitale medier i...... pædagoguddannelsen, og at de udspringer af en eksperimenterende udforskning af følgende grundlæggende spørgsmål: "Hvordan integrerer vi de digitale medier på en meningsfuld måde i didaktikken på pædagoguddannelsen?" Dertil beskæftiger enkelte af projekterne sig med spørgsmålet om, hvordan vi kvalificerer vores...

  6. Anmeldelse af Claus Friisberg: Ideen om et frit Danmark. Den nationalliberale bevægelses ideologi og politik - især i den formative periode (Varde 2003)

    DEFF Research Database (Denmark)

    Busck, Steen

    2003-01-01

    Anmeldelse af Claus Friisberg: Ideen om et frit Danmark. Den nationalliberale bevægelses ideologi og politik - især i den formative periode (Varde 2003)......Anmeldelse af Claus Friisberg: Ideen om et frit Danmark. Den nationalliberale bevægelses ideologi og politik - især i den formative periode (Varde 2003)...

  7. Review: Grigoleit, Grit: Integrationsvarianten. Die Hmong in den USA (2008 Buchbesprechung: Grigoleit, Grit: Integrationsvarianten. Die Hmong in den USA (2008

    Directory of Open Access Journals (Sweden)

    Hans-Bernd Zöllner

    2009-07-01

    Full Text Available Review of the monograph: Grigoleit, Grit (2008, Integrationsvarianten. Die Hmong in den USA, Passau: Verlag Karl Stutz, ISBN 978-3-88849-183-2, 250 pages Besprechung der Monographie: Grigoleit, Grit (2008, Integrationsvarianten. Die Hmong in den USA, Passau: Verlag Karl Stutz, ISBN 978-3-88849-183-2, 250 Seiten

  8. Kosmetisk kirurgi og den transformérbare krop -en analyse af den amerikanske tv-serie Nip/Tuck

    DEFF Research Database (Denmark)

    2009-01-01

    En analyse af krops- og kønsiscenesættelser i den amerikanske tv-serie om kosmetisk kirurgi Nip/Tuck......En analyse af krops- og kønsiscenesættelser i den amerikanske tv-serie om kosmetisk kirurgi Nip/Tuck...

  9. Religionsvetenskapen i övergången från den första till den andra moderniteten

    DEFF Research Database (Denmark)

    Ahlin, Lars

    2009-01-01

    Den tyske sociolog Ulrich Beck er optaget af overgangen fra den første til den anden modernitet. Han argumenterer for at denne overgang fører til at sociologiske kategorier som klasse og familie bliver zombie-kategorier. Det er kategorier skabt under den første modernitet men som stadigvæk er i...... brug i dag under den anden modernitet, til trods for at de er levende døde kategorier. I denne artikel argumenters for at kategorier, begreber, brugt inden for religionsvidenskaben, primært religionssociologien, også kan betragtes som zombie-kategorier. De begreber der diskuteres er religiøse...

  10. Tegn og iagttagelse. At læse Erslev efter den sproglige vending

    DEFF Research Database (Denmark)

    Simonsen, Dorthe Gert

    2001-01-01

    Historie, Historieteori, Historisk metode, Klassisk kildekritik, New Historicism, Den sproglige vending......Historie, Historieteori, Historisk metode, Klassisk kildekritik, New Historicism, Den sproglige vending...

  11. Russisk oljetransport gjennom Barentshavet : En tilfellestudie av den norske responsen

    OpenAIRE

    Aasen, Kari

    2010-01-01

    Oppgaven er en tilfellestudie av den norske responsen på økningen av russisk oljetransport gjennom Barentshavet. Oljetransporten fra Nordvest-Russland tok seg plutselig dramatisk opp i 2002, noe som kom svært overraskende på norske myndigheter. Hensikten med oppgaven har derfor vært å kartlegge den norske responsen, for å finne ut hva som har preget den. På bakgrunn av kjennetegnene ved responsen har jeg deretter forsøkt å sannsynliggjøre hvilke oppfatninger av Russland som vært dominerende. ...

  12. Permanent magnet design for high-speed superconducting bearings

    Energy Technology Data Exchange (ETDEWEB)

    Hull, John R. (5519 S. Bruner, Hinsdale, IL 60521); Uherka, Kenneth L. (830 Ironwood, Frankfort, IL 60423); Abdoud, Robert G. (13 Country Oaks La., Barrington Hills, IL 60010)

    1996-01-01

    A high temperature superconducting bearing including a permanent magnet rotor levitated by a high temperature superconducting structure. The rotor preferably includes one or more concentric permanent magnet rings coupled to permanent magnet ring structures having substantially triangular and quadrangular cross-sections. Both alternating and single direction polarity magnet structures can be used in the bearing.

  13. Radiomontagen og dens radiofoniske rødder. Om hørebilledet, den litterære tekstmontage, featuren og den moderne radiomontage

    Directory of Open Access Journals (Sweden)

    Ib Poulsen

    2001-09-01

    Full Text Available Radiomontagen og dens genrevarianter, hørebilledet og featuren har tidligere har tidligere været genstand for interesse fra især den æste- tiske og tekstanalytisk orienterede radioforskning. I denne artikel sæt- tes genren ind i en bredere kontekst, sociokulturelt og medie- og insti- tutionshistorisk. Ledetrådene i den diakrone fremstilling er dels spørgs- målet om genrens historiske og genremæssige rødder, dels en kombi- neret tekstanalytisk og receptionsæstetisk tilgang, der søger at ind- kredse de positioneringer af lytteren, radiomontagen og dens varianter tilbyder. Artiklen er baseret på grundige arkivstudier i DR og på inter- views med nogle af de ’montører’, som har bidraget til udviklingen af montagen, der i kraft af sin radiofoniske spændvidde mest vedholdende og varieret har forsøgt at udforske menneskets livssituation i den moder- ne verden, samtidig med at lytteren er blevet tilbudt en lytteposition, der prioriterer refleksion og eftertanke.

  14. Den Dingen auf den Grund gehen. Meta-Modell Arbeit in der E-Mailberatung.

    Directory of Open Access Journals (Sweden)

    Stefan Schumacher

    2011-10-01

    Full Text Available Ausgehend von der Frage, wie in der schriftlichen Kommunikation Informationsklarheit und Interpretationssicherheit verbessert werden können, beschreibt der Autor das sogenannte Meta-Modell der Sprache, das auf dem Hintergrund des Sprachwissenschaftlers Noam Chomsky von den Begründern des Neurolinguistischen Programmierens (NLP vorgestellt wurde. Bandler und Grinder stellen verschiedene Formen der sprachlichen Auslassung dar, die in der Kommunikation entstehenkönnen. Der Autor streicht die Bedeutung für die Onlineberatung heraus und zeigt anhand praktischer Beispiele, wie mit dem Meta-Modell der Sprache in der Beratung gearbeitet werden kann.

  15. The Bears Den: Russian Anti Access/Area Denial in the Maritime Domain

    Science.gov (United States)

    2016-05-01

    developing A2/AD “bubbles” in four areas: the Baltic, the Black Sea, Syria , and the Arctic. AU/ACSC/Wemyss, Matthew J./AY16 v Long-range missile...US’s attention.42 Russian President Vladimir Putin called the collapse of the Soviet Union “the greatest geopolitical catastrophe of the 20th...AD “bubbles” that take advantage of regional geography: the Baltic, the Black Sea, and Syria .46 A fourth area of A2/AD concern has developed in

  16. Auf den Schultern von Riesen und Zwergen Einsteins unvollendete Revolution

    CERN Document Server

    Renn, Jürgen

    2006-01-01

    Dies ist die Geschichte von Einsteins unvollendeter Revolution, einer tiefgreifenden Veränderung unserer Begriffe von Raum, Zeit, Materie und Strahlung. Diese Revolution begann in Einsteins Wunderjahr 1905, wurde durch seine allgemeine Relativitätstheorie aus dem Jahre 1915 fortgesetzt und wirkt in den heutigen Versuchen der Wissenschaft, die Entstehung und das Schicksal des Universums zu verstehen, weiter. Vor dem Hintergrund einer historischen Theorie des wissenschaftlichen Fortschritts wird Einsteins bis heute nicht abgeschlossene Revolution als das Ergebnis einer langfristigen Entwicklung des Wissens verständlich. Anhand der spannenden Geschichte von Einsteins Entdeckungen wird nachvollziehbar, warum große Denker wie Einstein weiter gesehen haben als ihre Vorgänger. Sie standen nicht nur auf den Schultern von Riesen, also den wissenschaftlichen Leistungen einzelner großer Vorgänger wie Newton, sondern auch auf den Schultern von "Zwergen", dem wissenschaftlichen Wissen, dem technischen Wissen, und d...

  17. Europas Abgrund neu inszeniert - Zwischen den Zeilen Ulrich Halterns

    Directory of Open Access Journals (Sweden)

    David R. Wenger

    2006-09-01

    Full Text Available Spätestens seit der in einigen EU-Mitgliedstaaten heiß geführten Debatte um den Maastrichtvertrag (1992 und seine Weiterführung in Amsterdam (1997 hat die Integrationsfrage tiefe Gewässer der Staatsphilosophie erreicht. Was sich zuvor gleichsam abgeschirmt von der Öffentlichkeit in Expertengremien vorwiegend handelstechnischer Vereinfachung widmete, brach in Gestalt erster nationaler Referenden jäh an die politische Oberfläche. Der zumal seit den negativen Verfassungsvoten in Frankreich und den Niederlanden allgegenwärtige Diskurs über eine europäische Identität verdeutlicht auffällig, wie sehr das einstmals so pragmatisch-sachliche Vorgreifen von den vergessenen Gründungsemotionen eingeholt wird. Was man sich nämlich nicht eingestehen will: Die Grundlage der europäischen Union basiert auf einer Niederlage.

  18. Evaluation Studies of the DEN-2/S-1 Vaccine.

    Science.gov (United States)

    1981-08-01

    Urbana, IL 61801). This drug was found to have antiviral activity against herpes s.mplex viruses (types I and II), vaccinia, influenza PR8...painfluenza 3, coxsackie A-21 and equine rhinovirus (Dr. Rinehart, personal communication). We have found that Didemnin A reduces plaque formation by DEN-i, DEN...3 and herpes simplex virus type 2 (see figures I and 2). Fifty percent inu- bition of plaque formation by these viruses was observed at drug

  19. Den store fred på vej i Tyrkiet

    DEFF Research Database (Denmark)

    Necef, Mehmet Ümit

    2013-01-01

    Der har de seneste måneder foregået seriøse fredsforhandlinger mellem den tyrkiske stat og PKK (Det kurdiske Arbejderparti) for at løse den 30-årige blo-dige konflikt. Denne artikel diskuterer, hvorfor det netop er en moderat isla-misk regering, der gør en stor indsats for at stoppe krigen med en...

  20. Nonsurgical management of two unusual cases of dens in dente

    Directory of Open Access Journals (Sweden)

    Gupta R

    2005-01-01

    Full Text Available The management of two unusual cases of dens invaginatus in a maxillary and a mandibular lateral incisor with a periradicular lesion are reported. The patient presented with pain and localized swelling. Despite the complex anatomy and diagnosis of dens invaginatus, nonsurgical root canal treatment was performed successfully. Furthermore essential clinical considerations and treatment options are suggested. Early diagnosis and management are important to avoid complications.

  1. Wer regiert das Intenet? - Ausschnitte aus den Veranstaltungen der Ringvorlesung

    OpenAIRE

    Schünemann, Wolf J.

    2015-01-01

    In den vergangenen Jahren, und noch einmal verstärkt mit den jüngsten Enthüllungen im sogenannten NSA-Skandal, hat sich die öffentliche Aufmerksamkeit für das Internet als Gegenstand politischen Denkens und gesellschaftlicher Regulierung erheblich gesteigert. Vor diesem Hintergrund scheint es geboten, grundlegende Fragen des gesellschaftspolitischen Umgangs mit dem Internet, vor allem auch der (zwischen-) staatlichen und transnationalen Regulierung des Netzes unter Einschluss verschiedener ge...

  2. Uddrag af Ph.d.-afhandlingen Den groteske modernisme

    DEFF Research Database (Denmark)

    Lübker, Henrik

    2011-01-01

    Om forholdet mellem "det groteske" og "den groteske modernisme" eksemplificeret i en læsning af E.A. Poes "The Fall of the House of Usher" og flere af Francis Bacons malerier.......Om forholdet mellem "det groteske" og "den groteske modernisme" eksemplificeret i en læsning af E.A. Poes "The Fall of the House of Usher" og flere af Francis Bacons malerier....

  3. CIOs mangler fundamentale egenskaber for at lede den digitale transformation

    DEFF Research Database (Denmark)

    Bjørn-Andersen, Niels

    2016-01-01

    CIOs er dårligt rustet til at gå i spidsen for digital disruption og innovation, advarer den internationale topforsker Joe Peppard med afsæt i analyse af mere end 200 CIO-s personligheder......CIOs er dårligt rustet til at gå i spidsen for digital disruption og innovation, advarer den internationale topforsker Joe Peppard med afsæt i analyse af mere end 200 CIO-s personligheder...

  4. Uddrag af Ph.d.-afhandlingen Den groteske modernisme

    DEFF Research Database (Denmark)

    Lübker, Henrik

    2011-01-01

    Om forholdet mellem "det groteske" og "den groteske modernisme" eksemplificeret i en læsning af E.A. Poes "The Fall of the House of Usher" og flere af Francis Bacons malerier.......Om forholdet mellem "det groteske" og "den groteske modernisme" eksemplificeret i en læsning af E.A. Poes "The Fall of the House of Usher" og flere af Francis Bacons malerier....

  5. Axial Halbach Magnetic Bearings

    Science.gov (United States)

    Eichenberg, Dennis J.; Gallo, Christopher A.; Thompson, William K.

    2008-01-01

    Axial Halbach magnetic bearings have been investigated as part of an effort to develop increasingly reliable noncontact bearings for future high-speed rotary machines that may be used in such applications as aircraft, industrial, and land-vehicle power systems and in some medical and scientific instrumentation systems. Axial Halbach magnetic bearings are passive in the sense that unlike most other magnetic bearings that have been developed in recent years, they effect stable magnetic levitation without need for complex active control.

  6. Cryogenic Hybrid Magnetic Bearing

    Science.gov (United States)

    Meeks, Crawford R.; Dirusso, Eliseo; Brown, Gerald V.

    1994-01-01

    Cryogenic hybrid magnetic bearing is example of class of magnetic bearings in which permanent magnets and electromagnets used to suspend shafts. Electromagnets provide active control of position of shaft. Bearing operates at temperatures from -320 degrees F (-196 degrees C) to 650 degrees F (343 degrees C); designed for possible use in rocket-engine turbopumps, where effects of cryogenic environment and fluid severely limit lubrication of conventional ball bearings. This and similar bearings also suitable for terrestrial rotating machinery; for example, gas-turbine engines, high-vacuum pumps, canned pumps, precise gimbals that suspend sensors, and pumps that handle corrosive or gritty fluids.

  7. TOPICAL REVIEW: Superconducting bearings

    Science.gov (United States)

    Hull, John R.

    2000-02-01

    The physics and technology of superconducting bearings is reviewed. Particular attention is given to the use of high-temperature superconductors (HTSs) in rotating bearings. The basic phenomenology of levitational forces is presented, followed by a brief discussion of the theoretical models that can be used for conceptual understanding and calculations. The merits of various HTS bearing designs are presented, and the behaviour of HTS bearings in typical situations is discussed. The article concludes with a brief survey of various proposed applications for HTS bearings.

  8. Teddy Bear Stories

    DEFF Research Database (Denmark)

    van Leeuwen, Theo; Caldas-Coulthardt, Carmen

    2014-01-01

    This paper presents a semiotic analysis of a key cultural artefact, the teddy bear. After introducing the iconography of the teddy bear, it analyses different kinds of stories to show how teddy bears are endowed with meaning in everyday life: stories from children's books, reminiscenses by adults...... about their childhood teddy bears, and children's accounts of what they do with teddy bears, both written for school and told 'out of school', The chapter sees teddy bears as artefacts that provide a cultural channeling for the child's need of a transitional object and argues that the meanings of teddy...... bears have traditionally centred on interpersonal relations within the nuclear family, but have recently been institutionalized and commercialized....

  9. A phylogeny of the bears (Ursidae) inferred from complete sequences of three mitochondrial genes.

    Science.gov (United States)

    Talbot, S L; Shields, G F

    1996-06-01

    Complete sequences of DNA are described for the cytochrome b tRNA(Thr) and tRNA(Pro) genes of mitochondria of four extant species of ursids and compared to sequences of four other species of ursids previously studied by us. Phylogenetic analyses indicate that the giant panda and the spectacled bear are the basal taxa of the ursid radiation. The ursines, a group which includes the sun bear, sloth bear, American black bear, Asiatic black bear, brown bear, and polar bear, experienced a rapid radiation during the mid Pliocene to early Pleistocene. The Asiatic black bear and American black bear are sister taxa. The brown bear and polar bear are the most recently derived of the ursines, with the polar bear originating from within a clade of brown bears during the Pleistocene. This paraphyletic association suggests that the rate of morphological evolution may be accelerated relative to that of molecular evolution when a new ecological niche is occupied. Calibration of the corrected average number of nucleotide differences per site with the fossil record indicates that transitions at third positions of codons in the ursid cytochrome b gene occur at a rate of approximately 6% per million years, which is considerably slower than comparable values reported for other species of mammal.

  10. Phylogeography of brown bears (Ursus arctos) of Alaska and paraphyly within the Ursidae.

    Science.gov (United States)

    Talbot, S L; Shields, G F

    1996-06-01

    Complete nucleotide sequences of the mitochondrial cytochrome b, tRNA(prolime), and tRNA(threonine) genes were described for 166 brown bears (Ursus arctos) from 10 geographic regions of Alaska to describe natural genetic variation, construct a molecular phylogeny, and evaluate classical taxonomies. DNA sequences of brown bears were compared to homologous sequences of the polar bear (maritimus) and of the sun bear (Helarctos malayanus), which was used as an outgroup. Parsimony and neighbor-joining methods each produced essentially identical phylogenetic trees that suggest two distinct clades of mtDNA for brown bears in Alaska: one composed only of bears that now reside on some of the islands of southeastern Alaska and the other which includes bears from all other regions of Alaska. The very close relationship of the polar bear to brown bears of the islands of southeastern Alaska as previously reported by us and the paraphyletic association of polar bears to brown bears reported by others have been reaffirmed with this much larger data set. A weak correlation is suggested between types of mtDNA and habitat preference by brown bears in Alaska. Our mtDNA data support some, but not all, of the currently designated subspecies of brown bears whose descriptions have been based essentially on morphology.

  11. Den ægte vare er det nye sort

    DEFF Research Database (Denmark)

    Hermansen, Judy

    2013-01-01

    Forbrugerne er måske nok dødtrætte af traditionelle reklamer og branding – men tydeligvis ikke af statusræset som sådan, siger Andrew Potter i bogen ”The Authenticity Hoax – How We Got Lost Finding Our Selves”. Nu handler det bare ikke om at flashe reklamesmarte brands, men om at have et forbrug......, der er så ’ægte og uspoleret’ som muligt. Potter er ikke den eneste, der har fået øje på autenticitetsbølgen – men han er nok den sjoveste. Ikke alene har han et skarpt blik for dens naragtigheder, men også en ualmindelig skarp pen. I Potters øjne er trenden simpelthen et udtryk for et statusforbrug...

  12. Den preoperativa handdesinfektionen : En systematisk litteraturstudie ur ett evidensperspektiv

    OpenAIRE

    2010-01-01

    Sammandrag: Omkring 2-6% av alla operationer leder till postoperativa infektioner. Postoperativa infektioner skapar onödigt lidande för patienten, samt är den enskilt största orsaken till mortaliteten inom kirurgin. Kostnader till följd av postoperativa infektioner beräknas enbart i Finland uppgå till 100-200 miljoner euro årligen. Den preoperativa handdesinfektionen är ett i ledet av förbyggande åtgärder som bör vidtas för att minska risken att postopertiva infekioner uppstår. Syfte...

  13. APEXIFICATION OF A TOOTH WITH DENS INVAGINATUS (A CASE REPORT

    Directory of Open Access Journals (Sweden)

    Epita Sarah Pane

    2015-08-01

    Full Text Available Dens invaginatus is a developmental malformation of teeth. A successful treatment of a maxillary lateral with dens invaginatus extending to mid root area, incomplete apical closure and large apical radiolucency will be presented. Sixteen months apexification with calcium hydroxide dressing was effective in resolving the problem after ultrasonic debridement, sodium hypochlorite irrigation. A 6-month recall radiograph is presented showing successful healing of the periapical lesion. Conventional endodontic treatment with calcium hydroxide apexification showed a favourable healing and will enhance the prognosis of the tooth.

  14. NCP-modellen og den motiverende samtale - et godt match

    DEFF Research Database (Denmark)

    Lang, Nanna Ruengkratok

    2015-01-01

    Det lader til, at NCP-modellen er kommet for at blive – også i Danmark. Men en model kan ikke bruges til meget, hvis ikke den kan omsættes i praksis. Her kommer diætistens relationelle og kommunikative evner i spil. Faglig ekspertise er vigtigt, men det er empati også. Patientinddragelse, evnen til...... at kunne kommunikere præcist, respekt samt forståelse for patientens perspektiv, motivation, ønsker og behov, er centralt for patientens adhærens – og samarbejde. Dette kan indtænkes ved at kombinere NCP med den motiverende samtale....

  15. Facial Cellulitis Arising from Dens Evaginatus: A Case Report

    Directory of Open Access Journals (Sweden)

    Chun-Ming Chen

    2005-07-01

    Full Text Available Dens evaginatus is a developmental anomaly that produces a tubercle on the occlusal surface of a tooth. It is found most frequently in the mandibular premolars. The occlusal tubercle easily causes occlusal interferences. Attrition or fracture of the tubercle can lead to pulpitis, pulp necrosis, periapical pathosis, and periapical infection. This case report illustrates the treatment of facial cellulitis arising from dens evaginatus with open apex. Calcium hydroxide was used for the apexification procedure. One year after canal obturation, radiography revealed no apical pathosis and the apical seal was evident.

  16. GULag-konference i Landstingssalen, Christiansborg, den 25. september 2012

    DEFF Research Database (Denmark)

    Frederichsen, Kim; Fledelius, Karsten; Foverskov, Carl Erik

    2012-01-01

    Artikel med referater af indlæg på og samlet vurdering af konference afholdt på Christiansborg om GULag, de sovjetiske KZ-lejre i Stalin-tiden arrangeret af Den Danske Helsinki-Komité for menneskerettigheder, Dansk-Russisk Forening og gulag.dk......Artikel med referater af indlæg på og samlet vurdering af konference afholdt på Christiansborg om GULag, de sovjetiske KZ-lejre i Stalin-tiden arrangeret af Den Danske Helsinki-Komité for menneskerettigheder, Dansk-Russisk Forening og gulag.dk...

  17. Den niende april 1940 - i dansk og norsk variant

    DEFF Research Database (Denmark)

    Bryld, Claus

    2015-01-01

    Ville modstand efter norsk model have været æren værd? Vi fik ufrihedens brød at smage i fem år, men den store befolkning led ikke nød, og demokratiet slap helskindet igennem.......Ville modstand efter norsk model have været æren værd? Vi fik ufrihedens brød at smage i fem år, men den store befolkning led ikke nød, og demokratiet slap helskindet igennem....

  18. Radicular Dens Invaginatus: Report of a Rare Case

    Directory of Open Access Journals (Sweden)

    V. T. Beena

    2012-01-01

    Full Text Available Dens invaginatus is a developmental anomaly resulting from invagination of a portion of crown forming within the enamel organ during odontogenesis. The invagination ranges from a slight pitting (coronal type to an anomaly occupying most of the crown and root (radicular type. Although a clinical examination may reveal a deep fissure or pit on the surface of an anterior tooth, radiographic examination is the most realistic way to diagnose the invagination. The objective of this case presentation is to report a rare case of radicular dens in dente, which is a rare dental anomaly.

  19. EcoBears

    DEFF Research Database (Denmark)

    Nielsen, Nick; Pedersen, Sandra Bleuenn; Sørensen, Jens Ager

    2015-01-01

    In this paper, we introduce the EcoBears concept that aims to augment household appliances with functional and aesthetic features to promote their "use'' and "longevity of use'' to prevent their disposal. The EcoBears also aim to support the communication of environmental issues in the home setting....... We present our initial design and implementation of the EcoBears that consist of two bear modules (a mother and her cub). We also present our preliminary concept validations and lessons learned to be considered for future directions....

  20. Co-existence of two dens invaginations with one dens evagination in a maxillary lateral incisor: a case report.

    Directory of Open Access Journals (Sweden)

    Seyed Amir Satvati

    2014-08-01

    Full Text Available A case with two simultaneous dens invaginations (DIs and one dens evagination (DE in a permanent maxillary lateral incisor is reported for the first time in a 21-year-old girl. DE known as talon cusp of the anterior teeth is a rare entity and its co-existence with DI has been reported scarcely in the literature. Simultaneous occurrence of two DIs with one DE has not been reported elsewhere. Undoubtedly, familiarity with the internal anatomy of such a rare condition can help prevent pulpal disease while performing restorative procedures.

  1. Denning habits of free-ranging dogs reveal preference for human proximity

    Science.gov (United States)

    Sen Majumder, Sreejani; Paul, Manabi; Sau, Shubhra; Bhadra, Anindita

    2016-01-01

    Dens are crucial in the early development of many mammals, making den site selection an important component of parental care in such species. Resource availability and shelter from predators primarily govern den selection. Species inhabiting human-dominated landscapes typically den away from human disturbance, often shifting dens to avoid humans during the early life of their young. Domesticated dogs have evolved in human proximity over centuries, being bred and reared in human homes for generations. While pets rely on their owners for shelter and care, free-ranging dogs roam uncared, and typically whelp in dens. We conducted a study on 148 free-ranging dog dens in India to understand their denning habits. Distance from resources influenced den choice, but anthropogenic disturbance did not. Dens were found in areas of high human activity, and begging from humans was preferred over scavenging. A study on 15 pregnant females revealed that females actively searched for denning sites, rejecting several intermediate ones before selecting the final den. We propose that the obvious preference of dogs for denning close to humans is a behavioural adaptation that helps them to survive in the urban landscape, in spite of the high human induced mortality during the early life of pups. PMID:27535214

  2. Krimi og nærhed - den kritiske realisme

    DEFF Research Database (Denmark)

    Hansen, Kim Toft

    I krimien ser vi en eksistentiel og samfundsmæssig opmærksomhed, der skriver sig ind i, diskuterer og problematiserer sociale, kulturelle og mentale sammenhænge. Derved analyserer den vores moralske normer og epistemologiske begrænsninger gennem en æstetisk repræsentation. Denne ramme fungerer i ...

  3. Verschillende typen van tertiaire geosynclinalen in den Indischen Archipel

    NARCIS (Netherlands)

    Umbgrove, J.H.F.

    1933-01-01

    Op menig eiland van den Indischen Archipel zijn tertiaire bekkens van sterke daling en sedimentatie geconstateerd. In de literatuur is hun veelal de naam geosynclinaal gegeven. Hun geschiedenis kan als een afzonderlijk verschijnsel en als een afgerond onderwerp beschouwd worden, zelfs indien men de

  4. Om den sociale og symbolske funktion af uddannelsesevalueringer

    DEFF Research Database (Denmark)

    Nørholm, Morten

    Afhandlingens teoretiske udgangspunkt er hos Émile Durkheim, Pierre Bourdieu, Ulf P. Lund­gren, Staf Callewaert, det konkrete er en række evalueringer af uddannelser til (semi)professioner inden for sundhedssektoren.                I afhandlingen konstrueres den sociale og symbolske funktion af...

  5. Hemmelig ransagning og brevstandsning i den digitale virkelighed

    DEFF Research Database (Denmark)

    Lentz, Lene Wacher

    2016-01-01

    Artiklen tager udgangspunkt i sager om databedrageri, hvor betalingskort misbruges til køb på internettet. Politiets adgang til private chatfora på nettet analyseres i forhold til de straffeprocessuelle tvangsindgreb hemmelig ransagning, aflytning og dataaflæsning. Desuden behandler artiklen den ...

  6. Om den sociale og symbolske funktion af uddannelsesevalueringer

    DEFF Research Database (Denmark)

    Nørholm, Morten

    Afhandlingens teoretiske udgangspunkt er hos Émile Durkheim, Pierre Bourdieu, Ulf P. Lund­gren, Staf Callewaert, det konkrete er en række evalueringer af uddannelser til (semi)professioner inden for sundhedssektoren.                I afhandlingen konstrueres den sociale og symbolske funktion af...

  7. Hyekyung Cho: Chinas langer Marsch in den Kapitalismus

    DEFF Research Database (Denmark)

    Czeskleba-Dupont, Rolf

    2006-01-01

    Chos afhandling fra Berlin refereres i hovedtræk. Tre modsætninger tages op i den: 1) mellem 'transitionen' ind i kapitalismen og herredømmet af et kommunistisk parti, hvor det bl.a.viser sig at particentralen fremmer liberaliseringen i kampen mod statsvirksomhederne; 2) mellem integrationen i ve...

  8. Cloud computing og den strafferetlige beskyttelse af data

    DEFF Research Database (Denmark)

    Mathiasen, Peter Dueholm

    2013-01-01

    Cloud computing er blevet en populær metode for bl.a. at opbevare data. Muligheden for eksempelvis at placere forretningskritiske data på teknisk udstyr, som ejes af den udbyder, der driver cloud computing tjenesten, gør det aktuelt at forholde sig til, om straffeloven i sådanne tilfælde yder et...

  9. God smag og bordskik er den bedste slankekur

    DEFF Research Database (Denmark)

    Andersen, Boris

    2011-01-01

    Rockwool Fondens Forskningsenhed har for nylig offentliggjort rapporten ’Helbred, trivsel og overvægt blandt danskerne’, der viser, at antallet af svært overvægtige i USA og Storbritannien er over dobbelt så stort som i Danmark. Den franske madsociolog Claude Fischler beskæftiger sig med sammenhæ...

  10. Den centraleuropæiske fortælling

    DEFF Research Database (Denmark)

    Østergaard, Uffe

    2014-01-01

    Om EU's udvidelse mod øst- og centraleuropa. Om hvordan Hitler og Stalins masseudrydelser har betydet mere for den europæiske identitete og sammenhængskraft end kristendommen, og hvordan antisemitisme er blevet en form for kode og fælles sprog for mennesker, der drømmer om en nationalt eller...

  11. An Interview with DOROTHY E. DENNING, Oral History 424

    OpenAIRE

    Yost, Jeffrey R.

    2013-01-01

    Computer Security History Project Computer security pioneer Dorothy Denning discusses her career including her Lattice Model for Computer Security, research on database security, intrusion detection, and other areas, such as her influential textbooks. The interview also addresses computer security research infrastructure and collaborators at various institutions where she worked including Purdue University, SRI International, Digital Equipment Corporation, Georgetown University, and Naval ...

  12. An Interview with DOROTHY E. DENNING, Oral History 424

    OpenAIRE

    Yost, Jeffrey R.

    2013-01-01

    Computer Security History Project Computer security pioneer Dorothy Denning discusses her career including her Lattice Model for Computer Security, research on database security, intrusion detection, and other areas, such as her influential textbooks. The interview also addresses computer security research infrastructure and collaborators at various institutions where she worked including Purdue University, SRI International, Digital Equipment Corporation, Georgetown University, and Naval ...

  13. Corporate Social Responsibility i forsyningskæden

    DEFF Research Database (Denmark)

    Liempd, Dennis van

    2007-01-01

    Styring og kontrol af etiske risici i forsyningskæden som en del af virksomhedens samfundsansvar (corporate social re­sponsibility; CSR) er blevet mere og mere vigtig nu til dags. Der er stor national og international fokus på CSR-området, ikke mindst fordi globaliseringen har gjort, at flere...

  14. Den rådne banan på kort

    DEFF Research Database (Denmark)

    Brodersen, Lars; Staunstrup, Jan K.; Møller, Jørgen;

    2011-01-01

    , at der gøres noget virkningsfuldt ved Udkantsdanmark. En anden kunne være, at debatgrundlaget og den præsenterede information er for ringe. Artiklen viser eksempler på kort fra den eksisterende, ikke altid konstruktive debat om Udkantsdanmark. Som modstykke hertil præsenteres i artiklen utraditionelle...... kort, der er designet til netop som visual literacy at bidrage til, at der overhovedet bliver en reel debat om Udkantsdanmark & Kernedanmark. Artiklen fremlægger ikke et politisk synspunkt. Artiklen præsenterer, hvor forbløffende effektivt politiske synspunkter kan fremlægges ved at tænke og agere i...... visual literacy. Artiklens budskab er at fremme den konstruktive debat generelt, hvor Den Rådne Banan og kortene blot tjener som eksempel. Kort kan være et fremragende diskussionsgrundlag, fordi det gode kort fungerer som billede og derfor kan blotlægge idéer og strukturer med betydelig oplysnings- og...

  15. Monitoring effecten vliegbewegingen Den Helder Airport: resultaten 2009

    NARCIS (Netherlands)

    Smit, C.J.

    2011-01-01

    Vanwege de nog steeds toenemende vraag naar vliegbewegingen vanuit de offshore-industrie bleken 22.000 vleigbewegingen onvoldoende om aan de vraag te kunnen voldoen. Daarom heeft Den Helder Airport de wens geuit het aantal vluchten uit te breiden naar 25.000. Een dergelijke behoefte zou kunnen leide

  16. Den historiske roman for børn

    DEFF Research Database (Denmark)

    Skyggebjerg, Anna Karlskov

    Bogen indeholder en redegørelse for den historiske roman som børnelitterær genre. Genren diskuteres i et teoretisk, historisk og analytisk perspektiv. Bogen afsluttes med en række principielle didaktiske overvejelser. Bogen er henvendt til alle, der beskæftiger sig professionelt med børnelitteratur...

  17. Sokrates giver sygeplejerskerne arbejdsglæden tilbage

    DEFF Research Database (Denmark)

    Fugl, Marie

    2008-01-01

    Sygeplejersker skal lære at åbne sig for og undre sig over hverdagens eksistentielle spørgsmål. Gør de det, genopdager de arbejdsglæden. Lektor Finn Thorbjørn Hansen fra DPU gør i ny bog op med glædesløsheden. Udgivelsesdato: September...

  18. Barnehagen, læring og den nasjonale konkurranseevnen

    DEFF Research Database (Denmark)

    Krejsler, John B.

    2013-01-01

    , og som har røtter i reformpedagogikken, havner dermed under press. Dette gir konkurransestatens forestillinger om danning en fordel, som er mer inspirert av teorien om rasjonelle valg (rational choice theory), og som fokuserer på «den opportunistiske person» som gjennom livslang læring utvikler sin...

  19. Den Europeiska unionen i en globaliserande värld

    DEFF Research Database (Denmark)

    Manners, Ian James

    2013-01-01

    faktor för att förstå regionala ansträngningar att samordna olika ekonomiska, sociala, miljömässiga och politiska förändringar. Regionalt integrationsarbete och globaliseringen av livsstilar har tillsammans blivit del av den centrala dynamiken i förbindelserna mellan EU och världen. Som Julia Kristeva...

  20. Den inkluderende læsekonsulent - vision eller realitet?

    DEFF Research Database (Denmark)

    Friis, Kirsten

    2009-01-01

    Denne artikel introducerer dels den inkluderende læsekonsulent som videnmedarbejder og forandringsagent for en inkluderende læsepolitik på baggrund af forskning, dels læsekonsulenters umiddelbare feedback til Nationalt Videncenter for Læsning....