Adsorption of cationic polyelectrolytes onto polystyrene latices was studied as function of polymer chemical composition and molecular weight, polymer and surface charge density and ionic strength. The ratio between polymer charges and surface charges was close to one when distances between polymer and surface charges were equal. Overcompensation of the surface charge was obtained at higher polyme

Alzheimer’s disease (AD) is an age-related, irreversible brain disorder that occurs gradually and results in memory loss, behavioural and personality changes. The disease is characterized by an abnormal accumulation of amyloid-beta (Ab) peptide in the extracellular space and the protein Tau within nerve cells of certain regions of the brain. Aâ1-42 is a major component of amyloid deposits in AD, b

The quest of developing the logistics discipline, with a more theoretical foundation, is something several authors have emphasized and called for. Today one could argue that most of the research on logistics has a strong connection to the positivistic paradigm where there is a great emphasis on prediction, rationality and control in the solutions produced. In order to challenge the common assumpti

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Biomass gasification is one of the alternatives to producing liquid fuels and chemicals from biomass residues. The gas produced in gasification contains CO, H2, H2O, CO2, light hydrocarbons and tars. Depending on the gasifier type, operating conditions and fuel, the light hydrocarbons can contain as much as 50 % of the total energy contents in the gas. The gas also contains catalyst poisons such a

An interview study was performed in order to reveal some of the problems associated with evacuation of a train inside a tunnel for senior citizens and people with disabilities, and to identify possible technical installations that would aid their evacuation. A total of 19 people took part in the study, in which it was demonstrated that senior citizens and people with disabilities require either a

Popular Abstract in Swedish Polymerer är långa kedjeliknande molekyler som är vanligt förekommande i naturen och även i många tekniska sammanhang. I lösning är polymerer ofta laddade. De kallas för polyelektrolyter om de har en sorts laddning och polyamfolyter om de har både positiva och negativa laddningar. Exempelvis så är DNA och RNA polyelektrolyter medan proteiner är polyamfolyter. Mitt arbetThree main themes are outlined in this thesis: Polyelectrolytes/DNA : In a living cell, DNA molecules have a compact conformation in order to fit in, while in a test tube they will take on an expanded cylindrical shape, due to the negative phosphate groups along the DNA molecule. With the help of computer simulations it has been shown that like-charged monomers of a poly- electrolyte can attract

The electronics in the automotive industry is facing a new era where safety critical functions are electrified, as for example drive-by-wire technology. At the same time as the number of electrical loads in the vehicles is increasing, the time to market is decreasing. Full scale prototypes of a vehicle are often only available at a late stage in the development process where changes are rather cos

Thin hard coatings on components and tools are used increasingly due to the rapid development in deposition techniques, tribological performance and application skills. The residual stresses in a coated surface are crucial for its tribological performance. Compressive residual stresses in PVD deposited TiN and DLC coatings were measured to be in the range of 0.03–4 GPa on steel substrate and 0.1–1

Popular Abstract in Swedish Denna avhandling handlar om arbetarförfattaren Ivar Lo-Johanssons modernitet, sådan den kommer till uttryck i de sk. statarromanerna: Godnatt, jord (1933), Bara en mor (1939) och Traktorn (1943). Först undersöks hur modernisering och modernitet skildras i romanerna och därefter hur författaren förhåller sig till den litterära riktning som kommit att symbolisera den esteThis dissertation examines the modernity of the Swedish proletarian author Ivar Lo-Johansson (1901-1990), as manifested in the so-called 'statare' novels: Godnatt, jord (Breaking Free, 1933), Bara en mor (Only a Mother, 1939), and Traktorn (1943). The dissertation examines, on the one hand, modernisation and modernity as the topoi of these novels, and on the other, how the author relates to the li

This thesis concerns a novel alkaline protease produced by an extremophilic microbial specie, designated as AL20, isolated from a feather sample collected at the shore of the alkaline soda lake Abjata in the Ethiopian Rift Valley. The isolate is a heterotrophic, alkaliphilic, halotolerant gram-positive, strictly aerobic, non-motile, non-spore forming bacterium. The organism grew at 37°C, pH 10, an