| 1. |
- Bessell, Michael S., et al.
(författare)
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Nucleosynthesis in a Primordial Supernova : Carbon and Oxygen Abundances in SMSS J031300.36-670839.3
- 2015
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Ingår i: Astrophysical Journal Letters. - 2041-8205 .- 2041-8213. ; 806:1
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Tidskriftsartikel (refereegranskat)abstract
- SMSS J031300.36-670839.3 (hereafter SM0313-6708) is a sub-giant halo star, with no detectable Fe lines and large overabundances of C and Mg relative to Ca. We obtained Very Large Telescope-Ultraviolet and Visual Echelle Spectrograph (UVES) spectra extending to 3060 angstrom showing strong OH A-X band lines enabling an oxygen abundance to be derived. The OH A-X band lines in SM0313-6708 are much stronger than the CH C-X band lines. Spectrum synthesis fits indicate an [O/C] ratio of 0.02 +/- 0.175. Our high signal-to-noise ratio UVES data also enabled us to lower the Fe abundance limit to [Fe/H](< 3D >,NLTE) < -7.52 (3 sigma). These data support our previous suggestion that the star formed from the iron-poor ejecta of a single massive star Population III supernova.
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| 2. |
- Gaulton, Kyle J, et al.
(författare)
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Genetic fine mapping and genomic annotation defines causal mechanisms at type 2 diabetes susceptibility loci.
- 2015
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Ingår i: Nature Genetics. - : Springer Science and Business Media LLC. - 1546-1718 .- 1061-4036. ; 47:12, s. 1415-1415
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Tidskriftsartikel (refereegranskat)abstract
- We performed fine mapping of 39 established type 2 diabetes (T2D) loci in 27,206 cases and 57,574 controls of European ancestry. We identified 49 distinct association signals at these loci, including five mapping in or near KCNQ1. 'Credible sets' of the variants most likely to drive each distinct signal mapped predominantly to noncoding sequence, implying that association with T2D is mediated through gene regulation. Credible set variants were enriched for overlap with FOXA2 chromatin immunoprecipitation binding sites in human islet and liver cells, including at MTNR1B, where fine mapping implicated rs10830963 as driving T2D association. We confirmed that the T2D risk allele for this SNP increases FOXA2-bound enhancer activity in islet- and liver-derived cells. We observed allele-specific differences in NEUROD1 binding in islet-derived cells, consistent with evidence that the T2D risk allele increases islet MTNR1B expression. Our study demonstrates how integration of genetic and genomic information can define molecular mechanisms through which variants underlying association signals exert their effects on disease.
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| 3. |
- Howes, L.~M., et al.
(författare)
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The EMBLA survey - metal-poor stars in the Galactic bulge
- 2016
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 460:1, s. 884-901
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Tidskriftsartikel (refereegranskat)abstract
- Cosmological models predict the oldest stars in the Galaxy should be found closest to the centre of the potential well, in the bulge. The Extremely Metal-poor BuLge stars with AAOmega survey (EMBLA) successfully searched for these old, metal-poor stars by making use of the distinctive SkyMapper photometric filters to discover candidate metal-poor stars in the bulge. Their metal-poor nature was then confirmed using the AAOmega spectrograph on the Anglo-Australian Telescope. Here we present an abundance analysis of 10 bulge stars with -2.8 < [Fe/H] < -1.7 from MIKE/Magellan observations, in total determining the abundances of 22 elements. Combining these results with our previous high-resolution data taken as part of the Gaia-ESO Survey, we have started to put together a picture of the chemical and kinematic nature of the most metal-poor stars in the bulge. The currently available kinematic data are consistent with the stars belonging to the bulge, although more accurate measurements are needed to constrain the stars' orbits. The chemistry of these bulge stars deviates from that found in halo stars of the same metallicity. Two notable differences are the absence of carbon-enhanced metal-poor bulge stars, and the alpha element abundances exhibit a large intrinsic scatter and include stars which are underabundant in these typically enhanced elements.
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| 4. |
- Jacobson, Heather R., et al.
(författare)
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High-Resolution Spectroscopic Study of Extremely Metal-Poor Star Candidates from the Skymapper Survey
- 2015
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Ingår i: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 807:2
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Tidskriftsartikel (refereegranskat)abstract
- The SkyMapper Southern Sky Survey is carrying out a search for the most metal-poor stars in the Galaxy. It identifies candidates by way of its unique filter set which allows for estimation of stellar atmospheric parameters. The set includes a narrow filter centered on the Ca II K 3933 angstrom line, enabling a robust estimate of stellar metallicity. Promising candidates are then confirmed with spectroscopy. We present the analysis of Magellan Inamori Kyocera Echelle high-resolution spectroscopy of 122 metal-poor stars found by SkyMapper in the first two years of commissioning observations. Forty-one stars have [Fe/H] <= -3.0. Nine have [Fe/H] <= -3.5, with three at [Fe/H] similar to -4. A 1D LTE abundance analysis of the elements Li, C, Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Mn, Co, Ni, Zn, Sr, Ba, and Eu shows these stars have [X/Fe] ratios typical of other halo stars. One star with low [X/Fe] values appears to be "Fe-enhanced," while another star has an extremely large [Sr/Ba] ratio: >2. Only one other star is known to have a comparable value. Seven stars are "CEMP-no" stars ([C/Fe] > 0.7, [Ba/Fe] < 0). 21 stars exhibit mild r-process element enhancements (0.3 <= [Eu/Fe] < 1.0), while four stars have [Eu/Fe] >= 1.0. These results demonstrate the ability to identify extremely metal-poor stars from SkyMapper photometry, pointing to increased sample sizes and a better characterization of the metal-poor tail of the halo metallicity distribution function in the future.
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| 5. |
- Johansson, Anna-Karin, et al.
(författare)
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Is one month treatment with dabigatran before cardioversion of atrial fibrillation sufficient to prevent thromboembolism?
- 2015
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Ingår i: Europace. - : Oxford University Press (OUP). - 1532-2092 .- 1099-5129. ; 17:10, s. 1514-1517
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Tidskriftsartikel (refereegranskat)abstract
- The use of direct oral anticoagulants (DOACs) in patients undergoing elective direct current (DC) cardioversion of non-acute atrial fibrillation (AF) can potentially shorten the time from initiation of anticoagulation treatment to cardioversion, compared with warfarin. The safety of this strategy needs to be investigated. Data from subgroup analysis from clinical trials with DOAC do not clarify whether 4-week treatment with DOAC is sufficient to prevent thromboembolism (TE) after cardioversion. The aim of this retrospective study was to assess the incidence of TE in anticoagulant naive patients converted after one month's pre-treatment with dabigatran.
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| 6. |
- Locke, Adam E, et al.
(författare)
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Genetic studies of body mass index yield new insights for obesity biology.
- 2015
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 518:7538, s. 197-401
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Tidskriftsartikel (refereegranskat)abstract
- Obesity is heritable and predisposes to many diseases. To understand the genetic basis of obesity better, here we conduct a genome-wide association study and Metabochip meta-analysis of body mass index (BMI), a measure commonly used to define obesity and assess adiposity, in up to 339,224 individuals. This analysis identifies 97 BMI-associated loci (P < 5 × 10(-8)), 56 of which are novel. Five loci demonstrate clear evidence of several independent association signals, and many loci have significant effects on other metabolic phenotypes. The 97 loci account for ∼2.7% of BMI variation, and genome-wide estimates suggest that common variation accounts for >20% of BMI variation. Pathway analyses provide strong support for a role of the central nervous system in obesity susceptibility and implicate new genes and pathways, including those related to synaptic function, glutamate signalling, insulin secretion/action, energy metabolism, lipid biology and adipogenesis.
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| 7. |
- Stenzelius, Karin, et al.
(författare)
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Patient-reported outcome after radical cystectomy : translation and psychometric validation of the Swedish version of the Functional Assessment of Cancer Therapy Scale Vanderbilt Cystectomy Index
- 2016
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Ingår i: Scandinavian journal of urology. - : Taylor & Francis. - 2168-1805 .- 2168-1813. ; 50:5, s. 374-379
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Tidskriftsartikel (refereegranskat)abstract
- Objective: The aim of this study was to translate and validate the Swedish version of the Functional Assessment of Cancer Therapy Scale - Vanderbilt Cystectomy Index (FACT-VCI). Materials and methods: For adaptation into Swedish, a multiprofessional team was used for translation including cultural adjustment, followed by back-translation. Test and retest in 10 individuals was followed by assessing metric properties in 75 consecutive patients with bladder cancer treated with radical cystectomy. Reliability and internal consistency were measured by Cronbach's alpha. Face validity was tested with two laypersons and construct validity was tested by correlation to the dimensions in the Functional Assessment of Cancer Therapy Scale - General (FACT-G). Results: The translated Swedish instrument showed validity and reliability similar to the original, and the results were comparable to published studies using FACT-VCI. The correlation between the VCI sum score and FACT-G dimensions was significant in all dimensions and the item-total correlation was over 0.3; therefore, the construct validity was acceptable. In addition, it was possible to detect differences in separate items in the translated version of FACT-VCI between age groups, type of diversion and those treated with chemotherapy, even though the samples were small. Conclusions: The Swedish version of FACT-VCI is a valid and reliable instrument for use in the follow-up of patients with bladder cancer treated with urinary diversion. To measure changes after surgery, preoperative assessment with the related FACT-G instrument is advisable.
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| 8. |
- Stubleski, Jordan, 1990-, et al.
(författare)
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The effect of drinking water contaminated with perfluoroalkyl substances on a 10-year longitudinal trend of plasma levels in an elderly Uppsala cohort
- 2017
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Ingår i: Environmental Research. - : Elsevier BV. - 0013-9351 .- 1096-0953. ; 159, s. 95-102
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: In 2012, drinking water contaminated with per- and polyfluoroalkyl substances (PFASs), foremost perfluorooctanesulfonic acid (PFOS) and perfluorohexanesulfonic acid (PFHxS) at levels over 20ng/L and 40ng/L, respectively, was confirmed in Uppsala, Sweden.OBJECTIVES: We assessed how a longitudinally sampled cohort's temporal trend in PFAS plasma concentration was influenced by their residential location and determined the plausible association or disparity between the PFASs detected in the drinking water and the trend in the study cohort.METHODS: The Prospective Investigation of the Vasculature in Uppsala Seniors (PIVUS) cohort provided plasma samples three times from 2001 to 2014. Individuals maintaining the same zip code throughout the study (n = 399) were divided into a reference (no known PFAS exposure), low, intermediate and high exposure area depending on the proportion of contaminated drinking water received. Eight PFASs detected in the majority (75%) of the cohort's plasma samples were evaluated for significant changes in temporal PFAS concentrations using a random effects (mixed) model.RESULTS: PFHxS plasma concentrations continued to significantly increase in individuals living in areas receiving the largest percentage of contaminated drinking water (p < 0.0001), while PFOS showed an overall decrease. The temporal trend of other PFAS plasma concentrations did not show an association to the quality of drinking water received.CONCLUSIONS: The distribution of contaminated drinking water had a direct effect on the trend in PFHxS plasma levels among the different exposure groups, resulting in increased concentrations over time, especially in the intermediate and high exposure areas. PFOS and the remaining PFASs did not show the same relationship, suggesting other sources of exposure influenced these PFAS plasma trends.
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| 9. |
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| 10. |
- Hagren Idevall, Karin, 1984-
(författare)
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Språk och rasism : Privilegiering och diskriminering i offentlig, medierad interaktion
- 2016
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This PhD thesis concerns language and racism. The aim is to explore how racism is reproduced in interaction in public debates on immigration, integration and refugee policy. From a constructivist pragmatic perspective, language is considered as a practice that composes and makes sense of our social world and all the phenomena and individuals that we perceive in it. Racist discourses discriminate against and privilege people by categorising them according to notions of cultural, ethnical, racial, religious and national differences.The thesis has two main themes: 1) the linguistic reproduction of, and response to, racist discrimination and privileging in interaction, and 2) the role of language in various public arenas, and the norms and conditions for participation in these arenas. The thesis comprises five studies. Study I examines racist discourses and conditions for participation in an online newspaper comments section. Study II examines how the phrase “politically correct” is used and negotiated in the same comments section, and how its usage leads to the reproduction and normalisation of racism. Another comments section is the focus of Study III, in which discriminating and privileging categorisations of Muslims, Islam, Swedes and Sweden are analysed. Study IV examines an anti-racist forum on the social networking site Instagram. In the study, the reproduction of norms of whiteness is analysed, as well as power relations that are evoked, sustained and transformed in interaction. Finally, Study V is an analysis of linguistic, visual and material reproductions of political positions and racist discourses in a debate among party leaders on Swedish television.The thesis demonstrates how normalisation of racism is accomplished in interaction, and how reproduction of hierarchically structured difference and bigoted stereotypes are performed, and challenged, through language. The medium, combined with the user’s speech acts, set up the norms and conditions for participation, and for the discursive processes that reproduce the relations and structures of power.
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