Sökning: "nmr studies"

Visar resultat 1 - 5 av 398 avhandlingar innehållade orden nmr studies.

  1. 1. Structure, dynamics and reactivity of carbohydrates : NMR spectroscopic studies

    Författare :Jerk Rönnols; Göran Widmalm; Mikael Bols; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Carbohydrates; Conformation; NMR spectroscopy; Hydrogen bond; organisk kemi; Organic Chemistry;

    Sammanfattning : The main focus of this thesis is on the ring conformations of carbohydrate molecules; how the conformational equilibria and the rates of the associated interconversions are affected by the molecular constitution and their surroundings.The conformational equilibria of a group of amine linked pseudodisaccharides, designed as potential glycosidase inhibitors, comprising α-D-altrosides are described in Chapter 3. LÄS MER

  3. 2. Nuclear Magnetic Relaxation in Micellar Solution and Lyotropic Liquid Crystals. Tools and Applications

    Författare :Ruslan Sitnikov; KTH; []
    Nyckelord :NMR; NMR relaxation dispersion; NMR spectrometer; low NMR frequencies; NMR duplexer; NMR preamplifier; NMR lock; surfactant systems; micellar solutions; lyotropic liquid crystals; cubic mesophase;

    Sammanfattning : Structurally, this Thesis is divided into two parts thatdescribe (i) the hardware development for NMR relaxationstudies and (ii) its applications for studies of the surfactantsystems.The developed hardware solutions allow to expand thefrequency range covered by conventional NMR spectrometers tomake NMR experiments feasible at resonance frequencies down to100 kHz. LÄS MER

  4. 3. Ions interacting with macromolecules : NMR studies in solution

    Författare :Yuan Fang; Istvan Furo; Monika Schönhoff; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; electrophoretic NMR; diffusion NMR; specific ion effects; Hofmeister; ion binding; Kemi; Chemistry;

    Sammanfattning : Specific ion effects, identified for more than hundred years, play an important role in a wide range of phenomena and applications. Several mechanisms such as direct ion interaction with molecules have been suggested to explain these effects, but quantitative experimental evidence remains scarce. LÄS MER

  5. 4. NMR Studies of Colloidal Systems in and out of Equilibrium

    Författare :Pavel V. Yushmanov; Peter Stilbs; Terence Gosgrove; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; stopped-flow NMR; temperature-jump NMR; crossrelaxation; NMR; NMR probe; fluorosurfactant; micellar kinetics; micellar structure; Physical chemistry; Fysikalisk kemi;

    Sammanfattning : The Thesis describes (i) the development of add-on instrumentation extending the capabilities of conventional NMR spectrometers and (ii) the application of the designed equipments and techniques for investigating various colloidal systems. The new equipments are: Novel designs of stopped-flow and temperature–jump inserts intended for conventional Bruker wide-bore superconductive magnets. LÄS MER

  7. 5. Structural and Interaction Studies of Bacterial Polysaccharides by NMR Spectroscopy

    Författare :Eva-Lisa Nordmark; Göran Widmalm; Sven Müller-Loennies; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; bacterial polysaccharides; NMR; interaction studies; structural studies; Escherichia coli; Salmonella enteritidis; Streptococcus thermophilus; Propionibacterium freudenreichii; Pseudoalteromonas aliena; P22 TSP; Organic chemistry; Organisk kemi;

    Sammanfattning : An introduction to bacterial polysaccharides and the methods for structural determination are described in the first two parts of the thesis.In a structural elucidation of bacterial polysaccharides NMR experiments are important as is component analysis. A short description of immunochemical methods such as enzyme immunoassays is included. LÄS MER