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1.
  • Säll, T., et al. (creator_code:aut_t)
  • Chloroplast DNA indicates a single origin of the allotetraploid Arabidopsis suecica
  • 2003
  • record:In_t: Journal of Evolutionary Biology. - : John Wiley & Sons Inc.. - 1010-061X .- 1420-9101. ; 16:5, s. 1019-1029
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • DNA sequencing was performed on up to 12 chloroplast DNA regions [giving a total of 4288 base pairs (bp) in length] from the allopolyploid Arabidopsis suecica (48 accessions) and its two parental species, A. thaliana (25 accessions) and A. arenosa (seven accessions). Arabidopsis suecica was identical to A. thaliana at all 93 sites where A. thaliana and A. arenosa differed, thus showing that A. thaliana is the maternal parent of A. suecica. Under the assumption that A. thaliana and A. arenosa separated 5 million years ago, we estimated a substitution rate of 2.9 x 10(-9) per site per year in noncoding single copy sequence. Within A. thaliana we found 12 substitution (single bp) and eight insertion/deletion (indel) polymorphisms, separating the 25 accessions into 15 haplotypes. Eight of the A. thaliana accessions from central Sweden formed one cluster, which was separated from a cluster consisting of central European and extreme southern Swedish accessions. This latter cluster also included the A. suecica accessions, which were all identical except for one 5 bp indel. We interpret this low level of variation as a strong indication that A. suecica effectively has a single origin, which we dated at 20 000 years ago or more.
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2.
  • Olsson, Mattias, 1975, et al. (creator_code:aut_t)
  • Sorption of Pu(III-IV) onto TiO2: A Preliminary Study
  • 2003
  • record:In_t: Materials Research Society Symposium Proceedings. - 155899694X ; 757, s. 517-522
  • swepub:Mat_conferencepaper_t (swepub:level_refereed_t)abstract
    • A preliminary study of the sorption of reduced plutonium (III-IV) onto TiO2 has been done under anoxic conditions at varying pH and ionic strength. The first approach was to study tetravalent Pu, but the sorption decreases with time in this case. This is probably due to disproportionation of Pu(IV) at the TiO2 surface, which then acts as a catalyst. A further observation that supports this explanation is that the sorption of Pu(IV) onto the walls of the experimental equipment is in some cases higher than the sorption of (disproportioned) Pu onto the oxide.Pu(III) sorption onto the oxide was also investigated and showed similarities with the previously investigated sorption of Pm(III) in a similar system.
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3.
  • Olsson, Mattias, 1975, et al. (creator_code:aut_t)
  • Sorption of Pu(VI) onto TiO2
  • 2003
  • record:In_t: Journal of Colloid and Interface Science. ; 266:2, s. 269-275
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • The sorption of Pu(VI) onto TiO2 was studied as a function of pH (210) and Pu concentration (10−810−4 M) under an N2 atmosphere, in 0.016 and 0.1 M NaClO4. A batch-wise method was used, in which pH was measured in separate experimental containers after removal of a sample to determine the amount of Pu that had been sorbed. As Pu is radioactive, it was used as a tracer and measured by liquid scintillation counting. No ionic strength dependence was discerned, which was taken as an indication of inner sphere complex formation. In the interval of pH 27 the system could be described by the formation of two positively charged surface complexes using a 1-pK Stern model. Sorption of the plutonyl ion (PuO22+) and the first hydrolysis species (PuO2(OH)+) was estimated using FITEQL to logK1=6.9 and logK2=1.4, respectively.
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4.
  • Olsson, Mattias, 1975, et al. (creator_code:aut_t)
  • Sorption of Pu(VI) onto TiO2
  • 2003
  • record:In_t: Journal of Colloid and Interface Science. - 1095-7103 .- 0021-9797. ; 266:2, s. 269-275
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • The sorption of Pu(VI) onto TiO2 was studied as a function of pH (210) and Pu concentration (10−810−4 M) under an N2 atmosphere, in 0.016 and 0.1 M NaClO4. A batch-wise method was used, in which pH was measured in separate experimental containers after removal of a sample to determine the amount of Pu that had been sorbed. As Pu is radioactive, it was used as a tracer and measured by liquid scintillation counting. No ionic strength dependence was discerned, which was taken as an indication of inner sphere complex formation. In the interval of pH 27 the system could be described by the formation of two positively charged surface complexes using a 1-pK Stern model. Sorption of the plutonyl ion (PuO22+) and the first hydrolysis species (PuO2(OH)+) was estimated using FITEQL to logK1=6.9 and logK2=1.4, respectively.
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5.
  • Olsson, Mattias, 1975, et al. (creator_code:aut_t)
  • Surface Charge Densities of Two Actinide(IV) Oxides: UO2 and ThO2
  • 2002
  • record:In_t: Journal of Colloid and Interface Science. - 1095-7103 .- 0021-9797. ; 256:2, s. 256-261
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • The surface charge behavior of uranium(IV) oxide and thorium(IV) oxide was investigated by potentiometric titration, and the pH point of zero charge (pzc) was determined for both oxides. Crystalline structures were investigated by X-ray powder diffraction, which showed that both oxides were of the cubic system (Fm3m) with a slightly differing unit cell size. The pzc was determined for the oxides at two ionic strengths: 0.01 and 0.1 M (NaClO4). The pzc of UO2 was found to be pH 55.5 at both ionic strengths, which was supported by measurement of the isoelectric point. The corresponding result for ThO2 was approximately pH 8, seemingly varying slightly with the ionic strength. The UO2 surface was sensitive to further oxidation, which affects titration experiments by yielding ostensibly high pzc unless the oxidation is prevented. Inert, or at least O2 and CO2 free, conditions are thus necessary during work with UO2.
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8.
  • Säll, Torbjörn, et al. (creator_code:aut_t)
  • Mode of reproduction in Arabidopsis suecica
  • 2004
  • record:In_t: Hereditas. - : Springer Science and Business Media LLC. - 1601-5223 .- 0018-0661. ; 141:3, s. 313-317
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • The breeding system of Arabidopsis suecica was investigated through genetic analysis of microsatellite segregation patterns in Five controlled crosses as well as in 16 single-mother families collected in the wild. Analysis of single and two-locus segregations in the F-2 generation following a cross clearly shows that A. suecica is reproduces sexually. The single-mother families show a high level of homozygosity corroborating earlier results indicating a high level of inbreeding. The high level of individual homozygosity is due both to a high level of selfing and to the underlying population structure.
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