Sökning: "electron-spin-resonance"

Visar resultat 11 - 15 av 21 avhandlingar innehållade ordet electron-spin-resonance.

1. 11. NMR diffusion studies on lyotropic liquid crystalline systems

   Författare :Greger Orädd; Frank Volke; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Diffusion; pulsed field gradient; liquid crystalline systems; lipid lateral diffusion; cubic phases; peptide-lipid interactions; hydrophobic mismatch; permeability;

   Sammanfattning : The pulsed field gradient fourier transform nuclear magnetic resonance (PFG-FTNMR) method to measure translational diffusion coefficients in multicomponent systems has been applied to amphiphilic molecules forming liquid crystalline phases.By analyzing the concentration dependence of the diffusion coefficients of water and amphiphile in a micellar system of N,N-dimethyldodecy lamine oxide (DDAO) in water it was possible to conclude that the micelles formed were polydisperse in size and shape. LÄS MER

3. 12. Modelling Chemical Reactions : Theoretical Investigations of Organic Rearrangement Reactions

   Författare :Per-Erik Larsson; Sten Lunell; Nessima Salhi-Benachenhou; Olle Matsson; Osvaldo Goscinski; Ian H. Williams; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Quantum chemistry; Kvantkemi; Quantum chemistry; Kvantkemi; Quantum Chemistry; Kvantkemi;

   Sammanfattning : Chemical reactions are ubiquitous and very important for life and many other processes taking place on earth. In both theoretical and experimental studies of reactivity a transition state is often used to rationalise the outcome of such studies. LÄS MER

4. 13. Crystal structure studies of a new series of molybdovanadate polyanions and some related vanadates

   Författare :Arne Björnberg; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; isopolyvanadates; molybdovanadate polyanions; single-crystal X-ray investigations; ESR spectroscopy; heteropoly blues;

   Sammanfattning : The determination of complexes formed in weakly acidic aqueous solutions containing pentavalent vanadium as well as hexavalent molybdenum has proved diffi cui t due to slow equilibria and 1 imi ted sol ubi 1 i ty of especially the vanadium species. The formation of several different polynuclear complexes with a very varied molybdenum/vanadium ratio also complicates the interpretation of Potentiometrie data. LÄS MER

5. 14. Bonding and Diffusion of Molecules in Zeolites by ESR and ENDOR

   Författare :Haitao Li; Eli Olaug Hole; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : This thesis studies bonding and diffusion of molecules in zeolites by Electron Spin Resonance (ESR) and Electron Nuclear Double Resonance (ENDOR). In the first part an introduction is given. In the second part (chapter 2) the detailed structure of a Cu2+ complex with water molecules in Cu-ZSM-5 zeolite was characterized with ENDOR at 4 K. LÄS MER

7. 15. Studies on treatment of renal anemia in patients on chronic hemodialysis

   Författare :Bergur V. Stefánsson; Göteborgs universitet; []
   Nyckelord :hemodialysis; IV iron; oxidative stress; erythropoietin; hepcidin;

   Sammanfattning : In patients with chronic kidney disease, treatment with erythropoiesis-stimulating agents (ESA) effectively corrects anemia. Most of these patients also need supplementation with regular iron injections to secure iron availability for proper erythropoiesis. LÄS MER