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- A, Komonen, et al.
(författare)
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Insects associated with fruit bodies of the wood-decaying fungus Oak mazegill (Daedalea quercina) in mixed oak forests in southern Sweden
- 2012
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Ingår i: Entomologisk Tidskrift. - 0013-886X. ; 133:4, s. 173-181
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Tidskriftsartikel (refereegranskat)abstract
- Polypores host species rich insect assemblages, but relatively few polypore species have been studied in detail. We investigated insect assemblages associated with the fruit bodies of Daedalea quercina, a specialist species on oak in southern Sweden. Fruit bodies (n = 228) were collected from 25 nature reserves and woodland key habitats, and were taken into the laboratory to collect emerging insects. A total of 245 insect individuals were recorded, belonging to at least 45 species. The numerically dominant fungivores were the tineid moths Montescardia tessulatella (n = 38 individuals) and Nemapogon fungivorellus (n = 10) and the coleopteran Ennearthron cornutum (Ciidae) (n = 44). Altogether 40 individuals of hymenopteran parasitoids were recorded, belonging to Braconidae (Exothecinae, Microgastrinae and Rogadinae, altogether 6 spp.), Ichneumonidae (Banchinae, Cryptinae and Orthocentrinae, altogether 4 spp.), Torymidae (1 sp.), Perilampidae (1 sp.) and Scelionidae (1 sp.). Most of the remaining insect species are not specifically associated with fruit bodies, but occupy many types of decaying material. In conclusion, D. quercina hosted a low number of insect individuals in general and only a few coleopteran species. The fungus apparently has only one specialist species, N. fungivorellus, which is a near-threatened (NT) species on the Swedish red list; the record from Norra Vi is the first from the Jönköping. The overall low number of insect individuals and the dominance of Lepidoptera among the fungivores is possibly explained by the tough fruit bodies of D. quercina, which only moths are able to utilize; fruit bodies which had already started to rot were devoid of moths.
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- A. Nojima, et al.
(författare)
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Calculational aspects of electron-phonon coupling at surfaces
- 2008
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Ingår i: J. Phys: Condens. Matter. - 1361-648X. ; 20
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Tidskriftsartikel (refereegranskat)abstract
- We study the validity of two frequently used approximations in calculations of electron–phonon coupling at surfaces. The rigid-ion approximation is a standard approximation used for the bulk metals. On the basis of density functional theory calculations, we find that for Be this approximation is as valid for surface atoms as for bulk atoms. In addition, the slab method for calculations of a phonon induced surface state lifetime is examined. The convergence of the electron–phonon matrix element with respect to the thickness of the slab is studied for several systems. When the number of slab layers is increased, the net effect of decreasing overlap and increasing number of final states depends strongly on the decay length of the surface state wavefunction and the band structure.
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- A.O., Tillmar, et al.
(författare)
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Using X-chromosomal markers in relationship testing: : How to calculate likelihood ratios taking linkage and linkage disequilibrium into account
- 2011
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Ingår i: Forensic Science International : Genetics. - Elsevier. - 1872-4973. ; 5:5, s. 506-511
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Tidskriftsartikel (refereegranskat)abstract
- X-chromosomal markers in forensic genetics have become more widely used during the recent years, particularly for relationship testing. Linkage and linkage disequilibrium (LD) must typically be accounted for when using close X-chromosomal markers. Thus, when producing the weight-of-evidence, given by a DNA-analysis with markers that are linked, the normally used product rule is invalid. Here we present an efficient model for calculating likelihood ratio (LR) with markers on the X-chromosome which are linked and in LD. Furthermore, the model was applied on several cases based on data from the eight X-chromosomal loci included in the Mentype® Argus X-8 (Biotype). Using a simulation approach we showed that the use of X-chromosome data can offer valuable information for choosing between the alternatives in each of the cases we studied, and that the LR can be high in several cases. We demonstrated that when linkage and LD were disregarded, as opposed to taken into account, the difference in calculated LR could be considerable. When these differences were large, the estimated haplotype frequencies often had a strong impact and we present a method to estimate haplotype frequencies. Our conclusion is that linkage and LD should be accounted for when using the tested set of markers, and the presented model is an efficient way of doing so.
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A place to live. Gender research on housing in Africa
- 1996
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Samlingsverk (redaktörskap) (övrigt vetenskapligt)abstract
- Be it a house or a makeshift, a shared or rented room, or a home of one's own, a place to live is central in surviving strategies of all urban households. In this volume the authors explore the gendered experiences of housing and housing rights in African countries. There are many differences but also many similarities in the pattern of women not having the same access and control over housing as men have. While women often are the bread-winners, they are also the home-makers, in the sense that it is women who put intense efforts in making a place home.
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A Sampler of International Media and Communication Statistics 2010
- 2011
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Samlingsverk (redaktörskap) (övrigt vetenskapligt)abstract
- The contemporary media culture raises more complex issues than ever before. Digital technologies, and advances of media such as the Internet, have driven the development. In this changing media landscape, traditional media, such as television, radio and newspapers, remain powerful, but their preconditions are affected. ‘A Sampler of International Media and Communication Statistics 2010’ is a collection and compilation of statistics from a large number of sources. The aim of the publication is to provide a comprehensive overview of international media and communication statistics, primarily concerning television and the Internet, but also, to a lesser extent, newspapers and radio. The emphasis of this publication is on the Internet and television. These two sections are divided into two parts, respectively ‘The world’ for comparisons between different parts of the world, and in ‘Regions’ for comparisons within different parts of the globe.
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| 10. |
- Aaberge, Rolf, et al.
(författare)
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Evaluation of an In-work Tax Credit Reform in Sweden: Effects on Labor Supply and Welfare Participation of Single Mothers
- 2008
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Rapport (övrigt vetenskapligt)abstract
- The purpose of this paper is to evaluate a recent Swedish in-work tax credit reform where we pay particular attention to labor market exclusion; i.e. individuals in as well as outside the labor force are included in the analysis. To highlight the importance of the joint effects from the tax and the benefit systems it appears particular relevant to analyze the labor supply behavior of single mothers. To this end, we estimate a structural microeconometric model of labor supply and welfare participation. The model accounts for heterogeneity in consumption-leisure preferences as well as for constraints in job opportunities. The results of the evaluation show that the reform generates welfare-gains for virtually every single mother, and moreover benefits low-income households. Finally, due to increased labor supply and decline in welfare participation we find that this reform is almost self-financing.
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