Sökning: "31P"
Visar resultat 1 - 5 av 54 avhandlingar innehållade ordet 31P.
1. Analysis and speciation of organic phosphorus in environmental matrices : Development of methods to improve 31P NMR analysis
Sammanfattning : Phosphorus (P) is an essential element for life on our planet. It is central in numerous biochemical processes in terrestrial and aqueous ecosystems including food production; and it is the primary growth-limiting nutrient in some of the world’s biomes. LÄS MER
2. Nuclear magnetic resonance studies on bentonite in complex mixed systems
Sammanfattning : In this work 23Na MAS NMR was validated as a successful quantitative method for studies of exchanging sodium in bentonites useful, in particular, for studies of ion-exchange kinetics. Na-enriched bentonites equilibrated in a re-circulated process water at iron-oxide pelletizing plants may acquire properties of Ca-bentonites after already 20 minutes of the equilibration time, since >50 % of sodium ions will be exchanged by calcium ions during first minutes of bentonite placed in contact with the process water. LÄS MER
3. Aspects on the Regio and Stereo Selectivity in the Hydrolsilylation of 1,3-Dienes
Sammanfattning : This thesis is a summary of four papers concerning various aspects on the transition metal catalysed hydrosilylation of 1,3-dienes. The hydrosilylation reaction is formally an addition of a hydrosilane to an unsaturated system and depending on the reaction conditions, control of stereo-, regio-, and chemo-selectivity can be achieved. LÄS MER
4. Vanadate and Peroxovanadate Complexes of Biomedical Relevance : A speciation approach with focus on diabetes
Sammanfattning : Diabetes mellitus is one of the most threatening epidemics of modern times with rapidly increasing incidence. Vanadium and peroxovanadium compounds have been shown to exert insulin–like actions and, in contrast to insulin, are orally applicable. However, problems with side–effects and toxicity remain. LÄS MER
5. Quantitative 31P magnetic resonance spectroscopy in diffuse liver disease
Sammanfattning : The studies in this thesis were delineated to evaluate the diagnostic possibilities in patients with diffuse liver disease by using phosphorus-31 MR spectroscopy and comparing the results with clinical, laboratory and histopathological findings. For this purpose in all 38 patients and 25 controls without evidence of liver disease were examined. LÄS MER
