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Träfflista för sökning "WFRF:(Johansson Frank) srt2:(2000-2004)"

Sökning: WFRF:(Johansson Frank) > (2000-2004)

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  • Brodin, Tomas, et al. (författare)
  • Conflicting selection pressures on the growth/predation risk trade-off in a damselfly
  • 2004
  • Ingår i: Ecology. - : Wiley. - 0012-9658 .- 1939-9170. ; 85:11, s. 2927-2932
  • Tidskriftsartikel (refereegranskat)abstract
    • Activity is an important behavioral trait that in most animals mediates a trade-off between obtaining food for growth and avoiding predation. Active individuals usually experience a higher encounter rate with food items and predators and, as a consequence, grow faster and suffer higher predation pressure than less active individuals. We investigated how predator-induced mortality and growth of the damselfly Coenagrion hastulatum depend on activity at the level of the genotype. Larvae from six different C. hastulatum families were reared in two different predator treatments: predator present or absent. Families differed in activity, and active families grew to a significantly larger size than less-active families. Within families there was a plastic response to predators. Larvae reared without predators were more active and grew larger than larvae reared with a nonlethal predator. In the presence of a lethal predator the active families experienced higher mortality than the less active families. The results illustrate that the growth/predation-risk trade-off was mediated by activity and clearly show a cost of antipredator behavior. They also suggest that variation in activity level might be genetically regulated and could explain why C. hastulatum are abundant in aquatic systems both with and without potential predators.
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  • International Perspectives on Learning and Teaching Mathematics
  • 2004
  • Samlingsverk (redaktörskap) (övrigt vetenskapligt/konstnärligt)abstract
    • This book provides examples from around the world of research insights and approaches to teaching mathematics that recognize the crucial role of the teacher in facilitating learning. The book has contributions from 14 countries and more than 50 mathematics educators and researchers. The scope of their expertise clearly illustrates how varied, complex and stimulating the study of mathematics education is. It also demonstrates that teachers and researchers around the world share a powerful interest in improving mathematics learning for all students. This book is written for classroom teachers, for pre-service and in-service education and for students in postgraduate courses.
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  • Johansson, Annica, 1969, et al. (författare)
  • Identification of polymorphic sites in the CDC2 gene, a possible susceptibility gene for Alzheimer's disease located on chromosome 10
  • 2002
  • Ingår i: The 8th International Conference on Alzheimer's Disease and Related Disorders, Stockholm 20-25 July 2002.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • The human cdc2, which is required in the mitotic cell cycle, has recently been associated with Alzheimer’s disease (AD). Cdc2 has also been shown to phosphorylate all of tau protein, β-amyloid and amyloid precursor protein (APP) both in vitro and in vivo. Inappropriate activation of cdc2 kinase in differentiated neurons has been suggested to contribute to neuronal dysfunction and degeneration in AD. The cdc2 gene maps to chromosome 10q, which recently has been found to be a susceptibility locus for AD, which makes the cdc2 gene a possible candidate gene for AD. To investigate whether the cdc2 gene contains polymorphic sites we sequenced the promoter region and the seven coding exons and flanking introns in 14 AD cases and 8 controls. We found several variations in the promoter region and three polymorphic sites in the intron between exon 6 and 7, one of these located in the 5’-splice site of exon 6. Data will be presented on the frequency of these polymorphisms in large series of AD patients and controls.
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