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Showing result 1 - 5 of 30 swedish dissertations matching the above criteria.
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1. Functional Traits in Sphagnum
Abstract : Peat mosses (Sphagnum) are ecosystem engineers that largely govern carbon sequestration in northern hemisphere peatlands. I investigated functional traits in Sphagnum species and addressed the questions: (I) Are growth, photosynthesis and decomposition and the trade-offs between these traits related to habitat or phylogeny?, (II) Which are the determinants of decomposition and are there trade-offs between metabolites that affect decomposition?, (III) How do macro-climate and local environment determine growth in Sphagnum across the Holarctic?, (IV) How does N2 fixation vary among different species and habitats?, (V) How do species from different microtopographic niches avoid or tolerate desiccation, and are leaf and structural traits adaptations to growth high above the water table?Photosynthetic rate and decomposition in laboratory conditions (innate growth and decay resistance) were related to growth and decomposition in their natural habitats. READ MORE
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2. High-Performance Composites from Modified Wood Fiber
Abstract : The objective of this work was to produce and evaluate high-performance wood fiber composites. High-performance was defined as: high dimensional stability and a high durability, including resistance to wood-decaying organisms (fungi, bacteria, and insects). READ MORE
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3. Wood Plastic Composites made from Modified Wood : Aspects on Moisture Sorption, Micromorphology and Durability
Abstract : Wood plastic composite (WPC) materials have seen a continuous market growth worldwide in the last decade. So-called extruded WPC profiles are today mainly used in outdoor applications, e.g. decking, railing and fencing. READ MORE
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4. Microstructural Decay in High-Strength Bearing Steels under Rolling Contact Fatigue
Abstract : The work presented in this thesis aims to enhance our understanding of material decay in high-strength steels used for bearing applications. The primary objective is to investigate the microstructural changes in two high-strength steels: 52100 steels, a popular bearing steel, and Hybrid 60, a relatively new bearing steel designed for long fatigue life and use at elevated temperatures. READ MORE
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5. Studies of drug resistance in minor HIV quasispecies
Abstract : The main objective was to study drug resistance mutations (DRM) in the HIV-1 reverse transcriptase (RT) gene of minor HIV-1 quasispecies, not detectable with standard techniques. Sensitive allele-specific PCR (AS- PCR) and next-generation sequencing (NGS) were developed to study resistance to drugs of relevance in low- and middle-income countries (LMIC); the nucleoside analogue RT inhibitor (NRTI) lamivudine (3TC) and the non-nucleoside RT inhibitors (NNRTIs) efavirenz (EFV) and nevirapine (NVP). READ MORE