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Sökning: WFRF:(Åhman Mikael)

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1.
  • Allard, Christina, et al. (författare)
  • Rasbiologiskt språkbruk i statens rättsprocess mot sameby : DN Debatt 2015-06-11
  • 2015
  • Annan publikation (populärvet., debatt m.m.)abstract
    • Statens hantering av forskningsresultat i rättsprocessen med Girjas sameby utgör ett hot mot Sverige som rättsstat och kunskapsnation. Åratal av svensk och internationell forskning underkänns och man använder ett språkbruk som skulle kunna vara hämtat från rasbiologins tid. Nu måste staten ta sitt ansvar och börja agera som en demokratisk rättsstat, skriver 59 forskare.
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3.
  • Håkansson, Mikael, 1957, et al. (författare)
  • Tetrameric thienylcopper and pentanuclear thienylcuprate
  • 2000
  • Ingår i: Journal of Organometallic Chemistry. - 0022-328X. ; 595:1, s. 102-108
  • Tidskriftsartikel (refereegranskat)abstract
    • The reaction between 2-bromothiophene and magnesium with subsequent addition of copper(I) chloride in tetrahydrofuran followed by dioxane yields thienylcopper, [Cu-4(C4H3S)(4)] (1). Without the addition of dioxane, magnesium thienylcuprate(I), [Mg(THF)(6)][Cu-5(C4H3S)(6)](2), (2) is formed. Both copper(I) complexes are oligomeric and are bridged by the thienyl ligands solely through carbon donors, thus lacking Cu-S bonds. The former compound, 1, is tetranuclear with a square-planar copper core and Cu-Cu distances of 2.453(3) and 2.507(3) Angstrom, and 2.464(2) and 2.489(2) Angstrom within the two crystallographically independent molecules, respectively; there is a weak (CuS)-S-... interaction of 3.118(5) Angstrom between these two molecules. The anion of 2 is a closo trigonal bipyramidal cluster of copper atoms in which the (ax)-(eq) edges are bridged by the thienyl ligands. Thus the Cu(ax)-Cu(eq) distances bridged by carbon are short, 2.497(5) and 2.503(5) Angstrom, indicative of three-centre Cu-C-Cu two-electron bonds, whereas the Cu(eq)Cu-...(eq) and Cu(ax)Cu-...(ax) distances are considerably longer at 3.135(7) and 3.423(8) Angstrom, respectively. The lack of participation of sulfur in bonding within the [Cu-5(C4H3S)(6)](-) cluster is discussed.
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4.
  • Åhman, Mikael, et al. (författare)
  • Flight endurance in relation to adult age in the green-veined white butterfly Pieris napi
  • 2009
  • Ingår i: Ecological Entomology. - : Wiley. - 0307-6946 .- 1365-2311. ; 34, s. 783-787
  • Tidskriftsartikel (refereegranskat)abstract
    • Abstract. 1. The flight apparatus in butterflies as well as in other insects is costly to manufacture. Since most animals live in a world where resources are limited, trade-offs are expected and available resources must thus be allocated between flight and other functions such as reproduction. 2. To mitigate this trade-off, previous studies have shown that butterflies can break down flight muscles in the thorax as they age in order to use muscle nutrients for reproduction. 3. Although breakdown of flight muscles is expected to reduce flight ability, relative flight muscle ratio (thorax mass/body mass) in many butterfly species does not decrease with age.  Our aim in this study was to test the relationship between flight endurance and adult age in the green-veined white butterfly Pieris napi (L.). The tests were performed in the laboratory under five different temperatures. 4. The results showed that age has a significant influence on butterfly flight endurance; older butterflies showed reduced flight endurance. Male butterflies fly for a longer time than females and flight endurance increase with temperature in both sexes.
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