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1.
  • Andersson, Mattias, et al. (creator_code:aut_t)
  • Intrinsic and extrinsic influences on the temperature dependence of mobility in conjugated polymers
  • 2008
  • record:In_t: Organic electronics. - : Elsevier. - 1566-1199 .- 1878-5530. ; 9:5, s. 569-574
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • The temperature dependence of charge carrier mobility in conjugated polymers and their blends with fullerenes is investigated with different electrical methods, through field effect transistor (FET), space charge limited current (SCLC) and charge extraction (CELIV) measurements. Simple models, such as the Gaussian disorder model (GDM), are shown to accurately predict the temperature behavior, and a good correlation between the different measurement methods is obtained. Inconsistent charge carrier concentrations in the modeling are explained through intrinsic non-equilibrium effects, and are responsible for the limited applicability of existing numerical models. A severe extrinsic influence from water in FETs with a hydrophilic insulator interface is also demonstrated. The presence of water leads to a significant overestimate of the disorder in the materials from measurements close to room temperature and erratic behavior in the 150-350 K range. To circumvent this problem it is shown to be necessary to measure under ultra high vacuum (UHV) conditions. © 2008 Elsevier B.V. All rights reserved.
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2.
  • Eriksson, Anna-Lena, 1971, et al. (creator_code:aut_t)
  • SHBG gene promoter polymorphisms in men are associated with serum sex hormone-binding globulin, androgen and androgen metabolite levels, and hip bone mineral density.
  • 2006
  • record:In_t: The Journal of clinical endocrinology and metabolism. - : The Endocrine Society. - 0021-972X .- 1945-7197. ; 91:12, s. 5029-37
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • CONTEXT: SHBG regulates free sex steroid levels, which in turn regulate skeletal homeostasis. Twin studies have demonstrated that genetic factors largely account for interindividual variation in SHBG levels. Glucuronidated androgen metabolites have been proposed as markers of androgenic activity. OBJECTIVE: Our objective was to investigate whether polymorphisms in the SHBG gene promoter [(TAAAA)(n) microsatellite and rs1799941 single-nucleotide polymorphism] are associated with serum levels of SHBG, sex steroids, or bone mineral density (BMD) in men. DESIGN AND STUDY SUBJECTS: We conducted a population-based study of two cohorts of Swedish men: elderly men (MrOS Sweden; n congruent with 3000; average age, 75.4 yr) and young adult men (GOOD study; n = 1068; average age, 18.9 yr). MAIN OUTCOME MEASURES: We measured serum levels of SHBG, testosterone, estradiol, dihydrotestosterone, 5alpha-androstane-3alpha,17beta-diol glucuronides, androsterone glucuronide, and BMD determined by dual-energy x-ray absorptiometry. RESULTS: In both cohorts, (TAAAA)(n) and rs1799941 genotypes were associated with serum levels of SHBG (P < 0.001), dihydrotestosterone (P < 0.05), and 5alpha-androstane-3alpha,17beta-diol glucuronides (P < 0.05). In the elderly men, they were also associated with testosterone and BMD at all hip bone sites. The genotype associated with high levels of SHBG was also associated with high BMD. Interestingly, male mice overexpressing human SHBG had increased cortical bone mineral content in the femur, suggesting that elevated SHBG levels may cause increased bone mass. CONCLUSIONS: Our findings demonstrate that polymorphisms in the SHBG promoter predict serum levels of SHBG, androgens, and glucuronidated androgen metabolites, and hip BMD in men.
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3.
  • 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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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. ; 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)
  • 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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6.
  • Olsson, Mattias, 1975, et al. (creator_code:aut_t)
  • Sorption of trivalent plutonium onto UO2 and the effect of the solid phase on the Pu oxidation state
  • 2005
  • record:In_t: Radiochimica Acta. ; 93, s. 341-346
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • A problem with plutonium in sorption studiesis its tendency to occur in a mix of oxidation states. Thiswork was a study of the sorption of plutonium on the solidphase UO2 in a perchlorate medium as a function of pH where plutonium is kept in its trivalent oxidation state.Experiments also showed that uranium(IV) oxide can reducePu(IV) to Pu(III) in an acidic solution and maintain it in thatstate. It was observed at the same time that the chemicallyinert solid phases TiO2 and ThO2 possibly increase the rateof disproportionation of Pu(IV) at a pH of about 0.5. Inaccordance with previous studies MnO2 was found to have anoxidizing effect, converting Pu(IV) into Pu(VI).A comparison is made between the sorption of Th(IV),Pu(III) and Co(II) on UO2 and TiO2, and Pu(VI) on TiO2.
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7.
  • 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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