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The use of metal organic vapor-phase epitaxy (MOVPE) for growth of one-dimensional nanostructures in the material systems GaAs, GaP, InAs and InP is investigated. Some kinetic effects are discussed, especially the general finding that in MOVPE thinner whiskers grow faster than thicker whiskers. Effects of growth temperature on growth rate and shape of the whiskers, the effects of different growth
Quenching of photoluminescence in a substituted polythiophene in the presence of a deposited C-60 layer is studied by steady-state and time-resolved photoluminescence (PL). The steady-state PL is evaluated by con -sidering the interference of the absorbed and emitted electro-optical field in the thin film coupled to exciton diffusion in the conjugated polymer. PL quenching occurs for excitons gene
Recently, fish farming instead of traditional agriculture has been seen as a way to increase agricultural profits from saline affected land. Concerns, however, have been raised that fish farming may increase the salinity problems. In the salinity affected soils of the El-Salam canal project area in Egypt, farmers are giving tip traditional farming for fish farming due to possibilities to increase
Safe water is a widespread problem in developing countries. In 2004 The United Nations formed the Lake Victoria Region Water and Sanitation Initiative, which focuses on increasing the water quality and basic sanitation in both rural- and urban areas. The government of Uganda is a part of the initiative, since the quality of the drinking water in the country persists to be a widespread problem. In
Popular Abstract in Swedish Tungmetaller i kommunala avfallsupplagExtensive use of heavy metals in modern society influences routes followed by fluxes on the surface of the Earth. The changed flow paths may be harmful for the balance of biological systems at different levels, micro-organisms, human beings and whole ecosystems, since the toxicity of heavy metals is determined by their concentrations and chemical forms. The fluxes of cadmium in Sweden and especia
Among psychiatric illnesses, genetically determined disorders usually have an early onset and a severe and complicated course. Gene-environmental interaction is of importance for aggressive impulsive behaviour. For example, alcoholism type II has a high family loading, a severe course, and is often associated with antisocial behaviour. In order to gain further understanding of aggressive and impul
Popular Abstract in Swedish Detta är en prospektiv longitudinell multicenterstudie som har haft som mål att utvärdera livskvaliteten (HRQL) hos patienter med cancer i huvudhalsregionen, vid diagnos, efter ett och fem år i relateration till tumörlokal, stadium, subsite, behand-ling, kön och ålder. Den första delen av studien, som varade i ett år, bestod av 357 patienter (medelålder 63 år; 72% män)
Encapsulated Haemophilus influenzae type b (Hib) and non-encapsulated H. influenzae (NTHi) are important pathogens causing invasive and mucosal infections in children. A 42 kDa surface-exposed lipoprotein, protein D, has been found to be a potential virulence factor of NTHi. The gene encoding protein D (hpd) is homologous to the glpQ gene encoding glycerophosphodiester phosphodiesterase in Escheri
To be able to explore different signal types and processing techniques, apt for sediment mapping, programmable, fully digital profiling systems has been built and tested. The systema are designed to be deployed also at small water depths from small boats, without special handling equipment. The usable frequency band is 100-25000 Hz, limited to approximately 2-10 kHz depending on the projector used
Popular Abstract in Swedish Ett stort antal fåglar flyttar vår och höst mellan sina häckningsplatser hos oss i norr till “övervintringsområden”. Många flyttar över stora avstånd, till södra Europa eller till Afrika. Ofta är flyttfåglarnas mål väl definierat, det händer att en fågel häckar på exakt samma plats år efter år. Det finns observationer från t.ex. Afrika att fåglar kan vara lika trogna siBirds are generally capable of accurate orientation. In this thesis I present studies about the external cues and the ecological factors that influences bird orientation. A multitude of environmental cues are used to select and maintain a proper direction. These are visual cues, like the sun and the starry night sky, but other cues like the geomagnetic field, wind and odours also play important ro
The enzyme deoxyuridine 5’-triphosphate nucleotidohydrolase (dUTPase, EC 3.6.1.23) catalyzes the hydrolysis of dUTP to dUMP and pyrophosphate. The reaction suppresses misincorporation of uracil into DNA and provides dUMP for the de novo synthesis of dTTP. dUTPase is a widespread enzyme and the fact that many viruses encode a dUTPase of their own suggests the enzyme to be important for the viral li
Popular Abstract in Swedish Komplex I eller NADH:kinon oxidoreduktas är det största och mest komplexa av de fem membranbunda enzymkomplexen som utgör den mitokondriella andningskedjan. Enzymet finns i alla typer av organismer från bakterier till däggdjur. Enzymet katalyserar oxidationen av NADH, som producerats i citronsyracykeln, och reduktion av fettlösligt kinon i membranet. Flavin och ett antaComplex I or NADH:quinone oxidoreductase the largest, most complex and least understood of the five membrane-bound enzyme complexes constituting the mitochondrial respiratory chain. The enzyme is present in all types of organisms, from bacteria to mammals. The enzyme catalyses the oxidation of NADH produced by the citric acid cycle and reduction of lipid soluble quinone in the membrane. Flavin and
Previous studies of mid-Ordovician limestone in Sweden have shown that over a stratigraphic interval representing a few million years there is a two orders-of-magnitude enrichment in fossil L-chondritic meteorites (empty set = 1-21 cm) and sediment-dispersed extraterrestrial chromite (EC) grains (>63 mu m). This has been interpreted as a dramatic increase in the flux of L-chondritic matter to Eart
Popular Abstract in Swedish Enterostatin är en peptid (en liten del av ett protein) som bildas i magsäcken och tarmen under en måltid. I djurförsök då råttor behandlas med enterostatin har man funnit att både aptiten och kroppsvikten minskade. Den minskade aptiten gällde speciellt för fett. Enterostatin fungerar som en mättnadssignal för fett och kan därför vara viktig för att hindra uppkomsten avThe presence of procolipase and enterostatin in the rat gastrointestinal tract has been investigated. Procolipase was identified, using in situ hybridization and immunohistochemistry, in exocrine cells of the pancreas as well as in chief cells of the fundus region of the stomach. Enterostatin is the activation peptide of procolipase and it has been found to act as a satiety signal for fat. Using a
