Sökning: "RELAXATION"

Visar resultat 1 - 5 av 713 avhandlingar innehållade ordet RELAXATION.

  1. 1. Water and protein solutions studied by field-dependent magnetic relaxation

    Detta är en avhandling från Biophysical Chemistry (LTH), Lund University

    Författare :Kristofer Modig; Lunds universitet.; Lund University.; [2003]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; relaxation; protein solvation; protein dynamics; protein denaturation; oxytocin; magnetic relaxation dispersion; nuclear magnetic resonance; lipid-binding protein; hydration; beta-lactoglobulin; BPTI; shielding anisotropy; water; Molecular biophysics; Molekylär biofysik;

    Sammanfattning : Popular Abstract in Swedish Kärnmagnetisk resonans (NMR) är en metod som bygger på att många atomkärnor uppför sig som mycket små magneter. Detta i sin tur beror på att kärnan beter sig som en liten roterande laddning. Man säger att kärnan har ett spinn, eller att kärnan är ett spinn. LÄS MER

  2. 2. Theory of water-proton spin relaxation in complex biological systems

    Detta är en avhandling från Lund University (Media-Tryck)

    Författare :Zhiwei Chang; Lunds universitet.; Lund University.; [2017-05-22]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; spin relaxation theory; immobilized macromolecules; magnetic relaxation dispersion; integral longitudinal relaxation rate; stochastic Liouville equations; multi-spin systems; cross-mode relaxation; spectral density functions;

    Sammanfattning : In complex biological systems (e.g. gels, cross-linked proteins and biological tissues), the longitudinal spin relaxation of water protons is primarily induced by exchange-mediated orientational randomization (EMOR) of intra- and intermolecular magnetic dipole-dipole couplings. LÄS MER

  3. 3. Zero-Field Splitting in Gd(III) complexes Towards a molecular understanding of paramagnetic relaxation

    Detta är en avhandling från Stockholm : Department of Physics, Stockholm University

    Författare :Shehryar Khan; Stockholms universitet.; [2015]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Zero-Field Splitting; Relaxation; Quantum Chemistry; Molecular Dynamics; Gd III ; kemisk fysik; Chemical Physics;

    Sammanfattning : The prime objectives of contrast agents in Magnetic Resonance Imaging(MRI) is to accelerate the relaxation rate of the solvent water protons in the surrounding tissue. Paramagnetic relaxation originates from dipole-dipole interactions between the nuclear spins and the fluctuating magnetic field induced by unpaired electrons. LÄS MER

  4. 4. Probing Dynamics of Oligosaccharides by Interference Phenomena in NMR Relaxation

    Detta är en avhandling från Stockholm : Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi

    Författare :Leila Ghalebani; Stockholms universitet.; [2008]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; NMR; sugars; oligosaccharides; carbon-13 relaxation; cross-correlated relaxation; molecular dynamics; internal motion; random jumps; PRE; paramagnetic relaxation; MEDICINE Chemistry; MEDICIN Kemi; fysikalisk kemi; Physical Chemistry;

    Sammanfattning : Oligosaccharides (carbohydrates) are a large class of biological molecules that are important as energy sources in the human body and have enormously varied biological functions. It is generally believed that biological activities of carbohydrates are related to their internal dynamics. LÄS MER

  5. 5. Paramagnetic relaxation reagents nuclear magnetic resonance studies of preferential solvation

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Hans Grahn; Umeå universitet.; [1986]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The interactions between neutral paramagnetic relaxation reagents (PARR's) and certain aromatic compounds have been studied by 1H and 13 C spin-lattice relaxation time measurements. In media such as cyclohexane and carbon tetrachloride, Cr(acac)3 becomes preferentially solvated by aromatic solutes. LÄS MER