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- Andersen, Jørgen Ellegaard, et al.
(författare)
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Reducibility of quantum representations of mapping class groups
- 2010
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Ingår i: Letters in Mathematical Physics. - : Springer. - 0377-9017 .- 1573-0530. ; 91:3, s. 215-239
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Tidskriftsartikel (refereegranskat)abstract
- In this paper we provide a general condition for the reducibility of the Reshetikhin–Turaev quantum representations of the mapping class groups. Namely, for any modular tensor category with a special symmetric Frobenius algebra with a non-trivial genus one partition function, we prove that the quantum representations of all the mapping class groups built from the modular tensor category are reducible. In particular, for SU(N) we get reducibility for certain levels and ranks. For the quantum SU(2) Reshetikhin–Turaev theory we construct a decomposition for all even levels. We conjecture this decomposition is a complete decomposition into irreducible representations for high enough levels.
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- Arvidsson, Ann-Kristin, et al.
(författare)
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Tyr-716 in the platelet-derived growth factor beta-receptor kinase insertis involved in GRB2 binding and Ras activation
- 1994
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Ingår i: Molecular and Cellular Biology. - : American Society for Microbiology. - 0270-7306 .- 1098-5549. ; 14:10, s. 6715-6726
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Tidskriftsartikel (refereegranskat)abstract
- Ligand stimulation of the platelet-derived growth factor (PDGF) beta-receptor leads to activation of its intrinsic tyrosine kinase and autophosphorylation of the intracellular part of the receptor. The autophosphorylated tyrosine residues mediate interactions with downstream signal transduction molecules and thereby initiate different signalling pathways. A pathway leading to activation of the GTP-binding protein Ras involves the adaptor molecule GRB2. Here we show that Tyr-716, a novel autophosphorylation site in the PDGF beta-receptor kinase insert, mediates direct binding of GRB2 in vitro and in vivo. In a panel of mutant PDGF beta-receptors, in which Tyr-716 and the previously known autophosphorylation sites were individually mutated, only PDGFR beta Y716F failed to bind GRB2. Furthermore, a synthetic phosphorylated peptide containing Tyr-716 bound GRB2, and this peptide specifically interrupted the interaction between GRB2 and the wild-type receptor. In addition, the Y716(P) peptide significantly decreased the amount of GTP bound to Ras in response to PDGF in permeabilized fibroblasts as well as in porcine aortic endothelial cells expressing transfected PDGF beta-receptors. The mutant PDGFR beta Y716F still mediated activation of mitogen-activated protein kinases and an increased DNA synthesis in response to PDGF, indicating that multiple signal transduction pathways transduce mitogenic signals from the activated PDGF beta-receptor.
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| 4. |
- Baraldi, Enrico, 1970-, et al.
(författare)
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Start-ups and networks : Interactive perspectives and a research agenda
- 2019
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Ingår i: Industrial Marketing Management. - : Elsevier. - 0019-8501 .- 1873-2062. ; 80, s. 58-67
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Tidskriftsartikel (refereegranskat)abstract
- This article introduces Industrial Marketing Management's special issue on start-ups and networks. To begin with, we stress the relevance of understanding the context wherein entrepreneurship unfolds – a context filled with social, technical and economic connections to which the start-up needs to relate. We also present and confront three network perspectives which bring different insights to the interplay between start-ups and networks: Social Network (SN) theory, the Industrial Marketing & Purchasing (IMP) view, and Actor-Network Theory (ANT). Next, we introduce the 12 papers of this special issue and place them on a continuum covering a start-up's process of network embedding and including the three periods of establishment, consolidation and stabilization. We conclude with a research agenda suggesting five avenues for further research: (1) tracing start-ups' process of network embedding, (2) mapping the connections between the different networks affecting a start-up, (3) grasping the negative effects of networks on start-ups, (4) making longitudinal case studies on start-ups and networks more comparable via common analytical tools, and (5) investigating how policy influences the complex interplay between start-ups and networks.
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| 5. |
- Bask, Miia, 1977-, et al.
(författare)
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Burned out to drop out : Exploring the relationship between school burnout and school dropout
- 2013
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Ingår i: European Journal of Psychology of Education. - : Springer. - 0256-2928 .- 1878-5174. ; 28:2, s. 511-528
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Tidskriftsartikel (refereegranskat)abstract
- This paper examines the development of school burnout among Finnish youth aged 16-18, specifically with regard to the following three components: a cynical attitude toward the school, feelings of inadequacy as a student, and exhaustion at school. There is evidence of an increase in all three components over time, but only among students on the academic track. There appear to be differences in burnout levels between those who drop out from school and those who do not, and the risk of an individual with high levels of cynicism or feelings of inadequacy dropping out is clearly higher than among those who score low on these two components. When various explanatory variables are controlled for, cynicism still remains a significant factor explaining drop out, and a low grade point average appears to be a major explanatory variable for school dropout. This study is especially interesting in the context of Finland, known for its equality-striving and high-quality educational system. Finnish youth, compared with youth in many other countries, nevertheless have a low level of in-school well-being. We use the Finnish Educational Transitions data (N = 878) collected in four waves, the first three on an annual basis and the fourth 5 years after the first one.
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| 10. |
- Bergh, Andreas, 1964-, et al.
(författare)
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Local enactment of the Swedish ‘advanced teacher reform’
- 2019
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Ingår i: Journal of Curriculum Studies. - : Routledge. - 0022-0272 .- 1366-5839. ; 51:3, s. 326-341
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Tidskriftsartikel (refereegranskat)abstract
- This article focuses on a new form of governing that targets a selected group of teachers. Specifically, it analyses how the Swedish so-called advanced teacher reform is enacted at the local level and discusses its implications for teachers’ professionalism. The methodological approach enables a local analysis in a broader international policy context. Using characteristic elements from curriculum theory to analyse the relationship between different levels and elaborating on the linguistic turn of curriculum theory, three concepts are central in the analysis: enactment, linguistic criteria and professionalism. Empirically, the study draws on material from a two-year application process in a medium-sized municipality. The result demonstrates that the local enactment process is clearly influenced by transnational policy trends and that less allowance is made for teachers’ own experience-based knowledge in the second studied year. The linguistic analysis shows how the applicants using the ‘right concepts’ were selected to become ‘advanced teachers’. As complex and qualitative aspects disappeared from the agenda, this type of governing, with its standardized use of language, may reduce schools’ educational potential. Changes like this raise new questions about how schools can maintain and develop democratic and professional values whilst being exposed to new policy trends.
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