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- O'Sullivan, S. P., et al.
(författare)
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The Faraday Rotation Measure Grid of the LOFAR Two-metre Sky Survey: Data Release 2
- 2023
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Ingår i: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 519:4, s. 5723-5742
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Tidskriftsartikel (refereegranskat)abstract
- A Faraday rotation measure (RM) catalogue, or RM Grid, is a valuable resource for the study of cosmic magnetism. Using the second data release (DR2) from the LOFAR Two-metre Sky Survey (LoTSS), we have produced a catalogue of 2461 extragalactic high-precision RM values across 5720 deg(2) of sky (corresponding to a polarized source areal number density of similar to 0.43 deg(-2)). The linear polarization and RM properties were derived using RM synthesis from the Stokes Q and U channel images at an angular resolution of 20 arcsec across a frequency range of 120 to 168 MHz with a channel bandwidth of 97.6 kHz. The fraction of total intensity sources (>1 mJy beam(-1)) found to be polarized was similar to 0.2 percent. The median detection threshold was 0.6 mJy beam(-1) (8 sigma(QU)), with a median RM uncertainty of 0.06 rad m(-2) (although a systematic uncertainty of up to 0.3 radm(-2) is possible, after the ionosphere RM correction). The median degree of polarization of the detected sources is 1.8 percent, with a range of 0.05 percent to 31 percent. Comparisons with cm-wavelength RMs indicate minimal amounts of Faraday complexity in the LoTSS detections, making them ideal sources for RM Grid studies. Host galaxy identifications were obtained for 88 percent of the sources, along with redshifts for 79 percent (both photometric and spectroscopic), with the median redshift being 0.6. The focus of the current catalogue was on reliability rather than completeness, and we expect future versions of the LoTSS RM Grid to have a higher areal number density. In addition, 25 pulsars were identified, mainly through their high degrees of linear polarization.
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- Hoes, J. N., et al.
(författare)
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EULAR evidence-based recommendations on the management of systemic glucocorticoid therapy in rheumatic diseases
- 2007
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Ingår i: Annals of the Rheumatic Diseases. - : BMJ. - 1468-2060 .- 0003-4967. ; 66:12, s. 1560-1567
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To develop evidence-based recommendations for the management of systemic glucocorticoid ( GC) therapy in rheumatic diseases. Methods: The multidisciplinary guideline development group from 11 European countries, Canada and the USA consisted of 15 rheumatologists, 1 internist, 1 rheumatologist-epidemiologist, 1 health professional, 1 patient and 1 research fellow. The Delphi method was used to agree on 10 key propositions related to the safe use of GCs. A systematic literature search of PUBMED, EMBASE, CINAHL, and Cochrane Library was then used to identify the best available research evidence to support each of the 10 propositions. The strength of recommendation was given according to research evidence, clinical expertise and perceived patient preference. Results: The 10 propositions were generated through three Delphi rounds and included patient education, risk factors, adverse effects, concomitant therapy ( ie, non-steroidal anti-inflammatory drugs, gastroprotection and cyclo-oxygenase-2 selective inhibitors, calcium and vitamin D, bisphosphonates) and special safety advice ( ie, adrenal insufficiency, pregnancy, growth impairment). Conclusion: Ten key recommendations for the management of systemic GC-therapy were formulated using a combination of systematically retrieved research evidence and expert consensus. There are areas of importance that have little evidence ( ie, dosing and tapering strategies, timing, risk factors and monitoring for adverse effects, perioperative GC-replacement) and need further research; therefore also a research agenda was composed.
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- Schweizer, M., et al.
(författare)
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Contrasting patterns of diversification in two sister species of martins (Aves: Hirundinidae): The Sand Martin Riparia riparia and the Pale Martin R. diluta
- 2018
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Ingår i: Molecular Phylogenetics and Evolution. - : Elsevier BV. - 1055-7903. ; 125, s. 116-126
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Tidskriftsartikel (refereegranskat)abstract
- Species not only responded idiosyncratically to past climate changes, there were also regionally contrasting effects on spatio-temporal diversification patterns. Studies of closely related species appear to be a particularly promising comparative approach to disentangle such regionally differential impacts. In this study, we undertook a comprehensive geographic sampling to investigate the evolutionary history of the Holarctic Sand Martin Riparia riparia and the chiefly Central and East Asian Pale Martin R. diluta. Previous phylogenetic studies using only a limited geographic sampling, particularly for the latter, revealed the two to be genetically distinct, with the former showing only a shallow genetic structure in mitochondrial DNA. Based on one mitochondrial, one autosomal and one Z-linked nuclear marker, we confirmed the shallow genetic structure in R. riparia even when including the morphologically relatively distinct subspecies R. r. shelleyi from the Nile Valley in Egypt and probably the Middle East. On the other hand the different subspecies of R. diluta, i.e. R. d. diluta from Central Asia, R. d. indica from the northwestern Indian Subcontinent, R. d. tibetana from the Tibetan Plateau and R. d. fohkienensis from southeastern China, were found to be genetically distinct. Their diversification started before the Early to Middle Pleistocene Transition, which was followed by a pronounced succession of glacial and interglacial periods. These rather old divergence events contrast with the lack of any strong phylogeographic structure in R. riparia. Strongly structured populations and regional diversification have been reported in different forest passerine families of South-East Asia. Here we demonstrate, however, that species characteristic of open-country habitats such as R. diluta might display a similar pattern. Morphometric analyses of 120 individuals revealed no clear differences between the different subspecies of R. diluta. Given their similarity also in plumage features, we refrain from proposing any splits despite their marked genetic differentiation, pending further studies and particularly the discovery of potential secondary contact zones. © 2018 Elsevier Inc.
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- Sangster, George, et al.
(författare)
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Taxonomic recommendations for Western Palaearctic birds: 10th report
- 2015
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Ingår i: Ibis. - : Wiley. - 0019-1019 .- 1474-919X. ; 157:1, s. 193-200
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Tidskriftsartikel (refereegranskat)abstract
- This paper is the tenth report of the Taxonomic Sub-Committee of the BOU Records Committee. Species-level decisions are based on criteria outlined by Helbig et al. (2002). The ninth report of the Sub-Committee was published by Sangster et al. (2013). Recommendations in this report fall into five categories: (i) recognition of higher taxa not recognised by Voous (Paroidea), (ii) changes in generic allocation (Melanocorypha leucoptera, Calandrella rufescens), (iii) changes in the taxonomic sequence of species (Alaudidae, Prunella), (iv) changes in species limits (Struthio camelus, Thalassarche cauta, Poecile lugubris, Phylloscopus tenellipes, Sylvia cantillans, Oenanthe lugens, Passer italiae), and (v) changes in nomenclature (Sylvia cantillans moltonii).
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