Sökning: "Institutioner Vid Lth"

Visar resultat 16 - 20 av 711 avhandlingar innehållade orden Institutioner Vid Lth.

1. 16. Modelling of molybdopterin-dependent enzymes

   Författare :Anders Thapper; Kemiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Inorganic chemistry; enzymes; transition state; intermediate; mechanism; molybdopterin; density functional theory; model systems; oxygen atom transfer; molybdenum; tungsten; Oorganisk kemi; Chemistry; Kemi;

   Sammanfattning : The thesis deals with models for molybdopterin-dependent enzymes. Several model systems containing molybdenum or tungsten have been prepared and characterised, and their reactivity with oxygen atom acceptors and donors have been investigated. LÄS MER

3. 17. Health Effects of Foods Enriched with Cereal beta-Glucans from Cereals

   Författare :Maria Biörklund; Kemiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Näringslära; Nutrition; glucose; cholesterol; oats; barley;

   Sammanfattning : Since soluble fibre in the form of the cereal beta-glucans found in oats and barley has been shown to have a positive effect on lipid and glucose metabolism, people at risk of developing cardiovascular diseases or diabetes might benefit from that a variety of palatable food products containing beta-glucans being available to them. The aim of the papers presented in the thesis was to evaluate the metabolic effects on persons with hypercholesterolemia or type 2 diabetes of various new food prototypes supplemented by beta-glucans. LÄS MER

4. 18. Measurements of Oscillator Strengths in Fe, Zr, Mo and Ce

   Författare :Carl Martin Sikström; Fysiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cerium; molybdenum; Atomic and molecular physics; Atom- och molekylärfysik; Condensed matter:electronic structure; magnetic and optical properties; electrical; magnetic resonance; supraconductors; relaxation; spectroscopy; Kondenserade materiens egenskaper:elektronstruktur; egenskaper elektriska; astrophysics; magnetiska och optiska ; spektroskopi; oscillator strengths; supraledare; zirconium; magnetisk resonans; Fourier transform spectroscopy; branching fraction; radiative lifetimes; iron;

   Sammanfattning : Atomic data are needed in many different areas of science and technology. Examples of users are the astronomical community and the lighting industry. In this work, the purpose of the projects has been to produce reliable atomic data needed to solve specific astrophysical problems. LÄS MER

5. 19. Statistical Mechanical Studies of Titrating Polyelectrolytes

   Författare :Magnus Ullner; Kemiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; integral equation theory; variational calculations; Monte Carlo simulations; end-to-end separation; apparent dissociation constant; titrating polyelectrolytes; electrostatic interactions; Physical chemistry; Fysikalisk kemi;

   Sammanfattning : Different models and statistical mechanical approximations for titrating polyelectrolytes are studied and the results compared with Monte Carlo simulations and experimental data. Three types of models have been used in the simulations: i) rigid structures and freely jointed chains with ii) rigid bonds and iii) flexible, harmonic bonds. LÄS MER

7. 20. Mechanistic investigation of platinum and palladium catalysed cross- coupling reactions. Implications for the Stille and Heck reactions

   Författare :Patrik Nilsson; Kemiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Metallorganisk kemi; Organometallic chemistry; Oorganisk kemi; Inorganic chemistry; parameter fitting; numerical solutions; platinum II ; palladium II ; NMR spectroscopy; transmetallation; Heck; Stille; kinetics; mechanism;

   Sammanfattning : The present thesis deals with various types of palladium(II) and platinum(II) complexes and their use in homogeneous catalysis. The focus has been devoted to mechanistic investigations concerning the Stille and Heck reactions and studies under both catalytic and stoichiometric conditions were conducted. LÄS MER