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| 2. |
- Olsson, Katarina, et al.
(författare)
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Säregna stiftelsetyper
- 2002
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Ingår i: Stiftelser i Norden II. ; , s. 125-194
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 3. |
- Falkengren-Grerup, Ursula, et al.
(författare)
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Uptake capacity of amino acids by ten grasses and forbs in relation to soil acidity and nitrogen availability
- 2000
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Ingår i: Environmental and Experimental Botany. - 0098-8472. ; 44:3, s. 207-219
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Tidskriftsartikel (refereegranskat)abstract
- Uptake capacity of organic nitrogen was studied in solution experiments on eight grasses and two forbs growing in acid soils with relatively high nitrogen mineralisation in southern Sweden. Uptake of a mixture of amino acids (alanine, glutamine, glycine), that varied between 1.6 and 6.3 mu mol g(-1) dw root h(-1), could not be explained by soil data from the species' field distributions (pH, total carbon and nitrogen, potential net mineralisation of ammonium and nitrate). The ratio between organic and inorganic nitrogen (methylamine) uptake was < 0.05 for the forbs, higher for the grasses with a maximum of 1.42 for Deschampsia flexuosa. The ratio was negatively correlated with measures related to soil acidity (Ellenberg's R-value, soil nitrate and total carbon) but not, as hypothesised, with the total amount of mineralised nitrogen. The total demand on nitrogen by all components of the ecosystem would probably have described the extent to which competition among and between plants and microbes induced nitrogen limitation. In a methodological study two grasses were exposed to pH 3.8, 4.5 and 6.0 and to 50, 100 and 250 mol l(-1) of three amino acids. Uptake was also compared between intact plants and excised roots. The treatment response varied considerably between the species which stresses the importance of studying intact plants at field-relevant pH and concentrations. (C) 2000 Elsevier Science B.V. All rights reserved.
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| 4. |
- Forsgren, Katarina, et al.
(författare)
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Deposition of HfO2 thin films in HfI4-based processes
- 2002
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Ingår i: Journal of the Electrochemical Society. - : The Electrochemical Society. - 0013-4651 .- 1945-7111. ; 149:10, s. F139-F144
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Tidskriftsartikel (refereegranskat)abstract
- This study describes deposition of HfO2 thin films by chemical vapor deposition (CVD) and atomic layer deposition (ALD) using HfI4 as the metal precursor. The layer-by-layer growth was also studied in real time with a quartz crystal microbalance. In ALD, the deposition rate was independent of the growth temperature, whereas in CVD, an exponential rate increase was observed. Monoclinic HfO2 was deposited on MgO and poly-Si substrates in a wide temperature range, and the choice of substrate had a strong influence on the orientation of the films. Epitaxial growth of HfO2 was observed on MgO(001) substrates at 400-500°C in the ALD process and at 500-600°C in the CVD process. The electrical characterization showed that the crystallinity of the films had a stronger influence on the dielectric constant than did the film thickness.
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| 5. |
- Forsgren, Katarina, et al.
(författare)
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Iodide-Based Atomic Layer Deposition of ZrO2 : Aspects of Phase Stability and Dielectric Properties
- 2002
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Ingår i: Chemical Vapor Deposition. - 0948-1907 .- 1521-3862. ; 8:3, s. 105-109
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Tidskriftsartikel (refereegranskat)abstract
- This study is an investigation into the influence of temperature, substrate, and thickness on the properties of ZrO2 thin films grown by atomic layer deposition (ALD). ZrI4 and H2O2 were used as source materials, and films deposited at temperatures between 250 °C and 500 °C consisted of mixed tetragonal and monoclinic ZrO2. The phase content and electrical properties of films of 3–30 nm thickness were studied for different temperatures and substrates. The films crystallized at smaller thicknesses on the Pt/Ti/SiO2/Si (denoted Pt in the following text) substrate than on polycrystalline Si (poly-Si) and MgO(001). It was also found that the film thickness had a stronger effect on the dielectric constant than either the growth temperature or the substrate.
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| 6. |
- Gormsen, Dagmar, et al.
(författare)
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The influence of collembolans and earthworms on AM fungal mycelium
- 2004
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Ingår i: Applied Soil Ecology. - : Elsevier BV. - 0929-1393. ; 27:3, s. 211-220
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Tidskriftsartikel (refereegranskat)abstract
- Arbuscular mycorrhizal (AM) mycelia are dependent on contact with plant roots for spore formation. In this study, earthworms and collembolans were regarded as potential dispersal vectors of AM fungal spores and hyphae, and we determined how they influenced the extension of AM fungi from host plant roots. Plantago lanceolata seedlings were grown in a mesh bag with an AM inoculurn of dried soil and root pieces from a set-aside agricultural field. The bag was placed in a growth box that was filled with a mixture of irradiated soil and sand, into which fungal hyphae could grow while roots were retained by the mesh. Three treatments with 15 replicates each were established with an addition of either Lumbricus rubellus, Folsomia candida or no soil fauna into the root-free soil. Five replicates of each treatment were harvested after 6, 10 and 15 weeks. The extension of the AM fungi was determined by measuring PLFA 16:1w5 and NLFA 16:1w5 as signature compounds of AM fungal biomass, spore production and mycorrhizal inoculum potential on P lanceolata seedlings. After 10 weeks, all indicators of AM fungal growth showed that the fungi had extended into the whole growth box. Plant shoot biomass of the host plants was greater in the presence of earthworms than other treatments, and the contents of PLFA 16:1w5 were greater in the earthworm than in the collembolan treatment. The reduced amount of PLFA 18:2w6,9 in the collembolan treatment relative to other treatments suggests that saprophytic fungi provided a food source for the collembolans. Spore production and mycorrhizal inoculurn potential were not affected by the presence of soil fauna. We conclude that the biomass of AM fungi was stimulated by earthworms, but that fungal dispersal over 20 cm was not influenced. (C) 2004 Elsevier B.V. All rights reserved.
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| 7. |
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| 8. |
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| 9. |
- Olsson, Katarina, et al.
(författare)
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Consumer and market law
- 2000
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Ingår i: Swedish law in the new millenium. ; , s. 318-342
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 10. |
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