Sökning: "Overhauser"

Visar resultat 6 - 10 av 13 avhandlingar innehållade ordet Overhauser.

1. 6. Advanced NMR techniques for structural elucidation in medicinal chemistry

   Författare :Hermina Wieske; Máté Erdélyi; Mikael Akke; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : The nuclear Overhauser effect (NOE) is an NMR phenomenon that can reveal spatial proximity between two atoms. It has found applications in organic chemistry and structural biology including natural product chemistry, organic synthesis, medicinal chemistry, macromolecular structure elucidation and protein-ligand interactions. LÄS MER

3. 7. Chloromethane Complexation by Cryptophanes : Host-Guest Chemistry Investigated by NMR and Quantum Chemical Calculations

   Författare :Zoltan Takacs; Jozef Kowalewski; Mikael Akke; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Host–guest complexes; inclusion phenomenon; cryptophanes; NMR; kinetics; activation energy; dipolar interaction; exchange; quantum chemical optimization; calculated chemical shifts; NOESY; cavity size; fysikalisk kemi; Physical Chemistry;

   Sammanfattning : Host–guest complexes are widely investigated because of their importance in many industrial applications. The investigation of their physico–chemical properties helps understanding the inclusion phenomenon. The hosts investigated in this work are cryptophane molecules possessing a hydrophobic cavity. LÄS MER

4. 8. Understanding overlooked molecular interactions in the cellulose/NaOH(aq) system

   Författare :Maria Gunnarsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; ATR-IR; dissolution; cellulose; NMR; urea; CO2; NaOH aq ;

   Sammanfattning : The cold NaOH(aq) system is a promising process for the production of textile fibres. Although the process has been studied for almost a century, there remain unsolved research issues, especially regarding the dissolution mechanism. LÄS MER

5. 9. Zeeman Interaction in Low-Dimensional III-V Semiconductor Structures

   Författare :Bernhard Kowalski; Fasta tillståndets fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; optically detected spin resonance; spin resonance; effective g-value; III-V semiconductors; low-dimensional structures; quantum wells; quantum dots; Stranski-Krastanow; photoluminescence; GaInAs; single dot Magneto-luminescence; Fysicumarkivet A:1997:Kowalski; Halvledarfysik; Semiconductory physics; GaInAs-InP;

   Sammanfattning : The Zeeman interaction in low-dimensional III-V semiconductor nanostructures is studied. The effective g-value of bulk InGaAs is measured by two different spin resonance techniques. Experimental conditions were found to control the Overhauser effect, thus enabling a highly accurate determination of the g-value, g* = -4.070 ± 0. LÄS MER

7. 10. Protein structures and protein-solvent interactions : development and application of methods in high-resloultion nuclear magnetic resonance spectroscopy

   Författare :Hannes Ponstingl; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : Nuclear magnetic resonance (NMR) spectroscopy in solution was used for the structural characterization of the proteins glutaredoxin-3 and flavodoxin from E. coli. A new NMR technique for the measurement of three-bond a proton-amide proton scalar coupling constants was developed. LÄS MER