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- Lord, Edna, et al.
(author)
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Ancient DNA of Guinea Pigs (Cavia spp.) Indicates a Probable New Center of Domestication and Pathways of Global Distribution
- 2020
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In: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 10:1
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Journal article (peer-reviewed)abstract
- Guinea pigs (Cavia spp.) have a long association with humans. From as early as 10,000 years ago they were a wild food source. Later, domesticated Cavia porcellus were dispersed well beyond their native range through pre-Columbian exchange networks and, more recently, widely across the globe. Here we present 46 complete mitogenomes of archaeological guinea pigs from sites in Peru, Bolivia, Colombia, the Caribbean, Belgium and the United States to elucidate their evolutionary history, origins and paths of dispersal. Our results indicate an independent centre of domestication of Cavia in the eastern Colombian Highlands. We identify a Peruvian origin for the initial introduction of domesticated guinea pigs (Cavia porcellus) beyond South America into the Caribbean. We also demonstrate that Peru was the probable source of the earliest known guinea pigs transported, as part of the exotic pet trade, to both Europe and the southeastern United States. Finally, we identify a modern reintroduction of guinea pigs to Puerto Rico, where local inhabitants use them for food. This research demonstrates that the natural and cultural history of guinea pigs is more complex than previously known and has implications for other studies regarding regional to global-scale studies of mammal domestication, translocation, and distribution.
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| 4. |
- Dahlstedt, Emma, et al.
(author)
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Synthesis of tetrathiafulvalenes suitable for self-assembly applications
- 2004
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In: Journal of Materials Chemistry. - : Royal Society of Chemistry (RSC). - 0959-9428 .- 1364-5501. ; 14:1, s. 81-85
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Journal article (peer-reviewed)abstract
- A series of new tetrathiafulvalenes, with double alkylthiol or alkyldisulfide substitution, have been prepared with a synthetic procedure that allows variation of different substituents. The target compounds 6a-e and 15e-i are sparsely soluble in organic solvents, but TTFs 6d and 15g gave a relatively dense packed monolayer upon exposure to gold surfaces.
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| 5. |
- Dahlstedt, M.
(author)
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Now you see it, now you don't : Reconsidering the problem of representation
- 2008
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In: Policy Studies. - : Informa UK Limited. - 0144-2872 .- 1470-1006. ; 29:2, s. 233-248
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Journal article (peer-reviewed)abstract
- The article reconsiders the problem of representation. Processes of representation, it is argued, not only take place in the arena of official politics, but are also being conducted in other social arenas, albeit in different forms. In order to understand the problem of representation faced by contemporary democracy, we must thus develop alternative approaches that proceed from a broad view of politics, that place more emphasis on the symbolic dimensions of politics, and that scrutinize the borderlands between politics and culture. In this article, a framework for such an approach to representation is presented, building on the traditions of both political and cultural studies. According to the approach outlined, representation may be viewed not only as an institutionally constrained praxis, but also as more generally applicable symbolic-communicative practices. © 2008 Taylor & Francis.
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| 6. |
- Dahlstedt, Magnus, 1975-, et al.
(author)
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Systemet med fritt skolval måste bytas ut
- 2018
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In: Svenska Dagbladet. - Stockholm, Sweden : Svenska Dagbladet AB & Co.. - 1101-2412.
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Journal article (pop. science, debate, etc.)
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| 8. |
- Klapp, Alli, et al.
(author)
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Betygens funktion och framtid
- 2020
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In: Perspektiv på skolans problem. - Malmö : Studentlitteratur AB. ; , s. 381-392
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Book chapter (other academic/artistic)abstract
- I detta kapitel lyfter vi två problematiska sidor av dagens målrelateradebetygssystem, som kan ha negativa och långtgående konsekvenser för ett stort antal elever, men även för samhället i stort. Dessa sidor av betygssystemet handlar dels om betygens likvärdighet och urvalsfunktion, dels om betygsskalan och betygssteget F (dvs. betyget för icke godkänt resultat). Ett utbildningssystem med höga krav på behörighet (betyg) och som dessutom har ett icke godkänt betygssteg (F), riskerar att leda till att elever stängs ute från vidare utbildning såsom gymnasieskolan – trots att denna i dag är informellt obligatorisk och nödvändig för att komma vidare inom utbildningssystemet eller för att få arbete. Frågan är när i utbildningssystemet en formell urvalsfunktion behövs och vilka möjligheter till fortsatt utbildning vi erbjuder elever som får icke godkända betyg.
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