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64111.
  • Hansson, Christer (författare)
  • Achrysocharoides Girault (Hymenoptera, Eulophidae) new to tropical America, with eight new species
  • 2012
  • Ingår i: ZooKeys. - : Pensoft Publishers. - 1313-2970 .- 1313-2989. ; 173, s. 79-108
  • Tidskriftsartikel (refereegranskat)abstract
    • The genus Achrysocharoides Girault is here reported for the first time from tropical America. Included are ten species, eight newly described: A. asperulus, A. callisetosus, A. cuspidatus, A. foveatus, A. infuscus, A. mediocarinatus, A. purpureus, A. sulcatus, and two already known: A. ecuadorensis (Hansson) and A. gliricidiae (Hansson & Cave). All species are included in an identification key, diagnosed, described and illustrated. Only one of the species, A. gliricidiae, has a host record, an endoparasitoid in a leafmining Gracillariidae (Lepidoptera) on Gliricidia sepium (Fabaceae), thus conforming to the biology of extralimital Achrysocharoides species. The genus Kratoysma Bouček is here established as a junior synonym of Achrysocharoides, and the following species previously in Kratoysma are here recombined to Achrysocharoides: K. citri Bouček, K. ecuadorensis Hansson, K. gliricidiae Hansson & Cave, K. longifacies Hansson, K. nepalensis Hansson, Derostenus usticrus Erdös.
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64112.
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64113.
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64114.
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64115.
  • Hansson, Christer, et al. (författare)
  • Allergy to adhesive plaster
  • 1998
  • Ingår i: Allergy. - 1398-9995. ; 53:3, s. 324-325
  • Tidskriftsartikel (refereegranskat)
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64116.
  • Hansson, Christer (författare)
  • Apleurotropis Girault (Hymenoptera: Eulophidae) new to tropical America, including six new species and biological records
  • 2010
  • Ingår i: Zootaxa. - 1175-5334. ; :2563, s. 35-52
  • Tidskriftsartikel (refereegranskat)abstract
    • The genus Apleurotropis Girault is here reported for the first time from tropical America. The genus is diagnosed and compared to Achrysocharoides Girault with which it shares important characters. Changes are suggested in two existing keys to Neotropical/Nearctic genera of Eulophidae to include Apleurotropis. Included in Apleurotropis are also six newly described species: A. albicaulis, A. albiscapus, A. anemia, A. assis, A. ficaria, and A. strix, spp. nov., all of which are included in an identification key, diagnosed, described and illustrated. Four of the species have host records: three are parasitoids on leafminers and the fourth species is associated with galls. These new biological records are in accordance with the known host spectrum for this genus.
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64117.
  • Hansson, Christian, et al. (författare)
  • cis-Bis(acetato-kO)bis(dimethyl sulfide-kS)platinum(II)
  • 2008
  • Ingår i: Acta Crystallographica. Section C: Crystal Structure Communications. - 0108-2701. ; 64, s. 61-63
  • Tidskriftsartikel (refereegranskat)abstract
    • The title compound, cis-[Pt(CH3COO)2(C2H6S)2], crystallizes in the P21/c space group with a pseudo-square-planar geometry. The complex forms centrosymmetric dimeric packing units, with C-H...O-Pt interactions and a short Pt...Pt distance [3.5868(2) Å]. The coordination mode of the acetate ligands is monodentate and they are oriented almost perpendicular to the coordination plane. Cambridge Structural Database [Allen (2002). Acta Cryst. B58, 380-388] data show a preferred staggered conformation with respect to the coordination plane for Me2S in complexes with Pt(II).
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64118.
  • Hansson, Christian, et al. (författare)
  • cis-Bis(dimethyl sulfide)dinitratoplatinum(II) at 295 and 150 K
  • 2007
  • Ingår i: Acta Crystallographica. Section C: Crystal Structure Communications. - 0108-2701. ; 63, s. 465-468
  • Tidskriftsartikel (refereegranskat)abstract
    • The title compound, [ Pt( NO3)(2)( C2H6S)(2)], crystallizes in the P2(1)/ n space group ( Z' = 2), with pseudo- square- planar coordination geometry. The complex forms dimers with pseudosymmetry C-i arranged in columns along the b- axis direction, with Pt center dot center dot center dot Pt distances of 6.3056 ( 3) and 4.2382 ( 2) angstrom ( at 150 K). Each column is surrounded by six other columns in a honeycomb rod- like packing. The coordination mode of the nitrate ligands is monodentate, with Pt - O - N angles ranging from similar to 117 to similar to 118 degrees and a tilt between the nitrate ligands and the coordination planes in the range similar to 63 - 70 degrees ( at 150 K). The coordination mode of the nitrate ligands is compared with that observed in reported Pt( NO3)(2)L-2 complexes ( where L is a ligand with a donor atom from group 15 or 16), all of which are monodentate, with an average Pt - O - Nangle of 118 ( 2) degrees and a tilt in the range 90 +/- 30 degrees ( with two exceptions, in which the nitrates are approximately in the coordination plane).
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64119.
  • Hansson, Christian (författare)
  • cis-Dichloridobis(diethyl sulfide-kappa S) platinum(II) at 295 and 150 K
  • 2007
  • Ingår i: Acta Crystallographica. Section C: Crystal Structure Communications. - 0108-2701. ; 63, s. 361-363
  • Tidskriftsartikel (refereegranskat)abstract
    • The title compound, cis-[ PtCl2( C4H10S) (2)], crystallizes in the space group P21/ n with pseudo- square- planar coordination geometry. The orientation of the ethyl groups on the S atoms is staggered with respect to the coordination plane, giving the complex approximate C(2)v symmetry. The complex does not form dimeric packing units with short Pt center dot center dot center dot S intradimeric distances as seen in some related complexes, but instead displays C - H center dot center dot center dot Cl interactions in three dimensions. These C - H center dot center dot center dot Cl - Pt contacts are compared with those of related compounds reported in the Cambridge Structural Database, which show a frequency maximum in the range 120 - 170 degrees for the C - H center dot center dot Cl angle.
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64120.
  • Hansson, Christian, et al. (författare)
  • Cis/trans isomers of PtX2L2 (X = halogen, L = neutral ligand); the crystal structure of trans-dichlorobis(dimethyl sulfide) platinum(II) and the pressure dependence of its unit-cell dimensions
  • 2006
  • Ingår i: Acta Crystallographica. Section B: Structural Science, Crystal Engineering and Materials. - 2052-5206. ; 62:3, s. 474-479
  • Tidskriftsartikel (refereegranskat)abstract
    • trans-PtCl2(dms)(2) (dms is dimethyl sulfide) crystallizes in the space group P2(1)/n and adopts the molecular point group C-i, which is the most frequently occurring point group for trans-PtX2L2 complexes (78%), as observed in the Cambridge Structural Database (CSD; 2005 release), followed by C-1 (16%). Density functional theory calculations show that the observed geometry for trans- PtCl2(dms)(2) has slightly higher energy than the most favorable geometry in the point group C-2h, but this geometry would require a space group that hampers close packing, thus showing that intermolecular forces determine the point group for the title compound. High-pressure powder diffraction studies of trans-PtCl2(dms)(2) show no phase transformation up to 8.0 GPa. The bulk modulus is 8.1 ( 6) GPa and the pressure derivative 8.1 (4). In the CSD, the number of cis- and trans-PtX2L2 compounds are almost equal, viz. 156 cis and 160 trans compounds, showing no preference for either isomer in the solid state.
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