Search for dissertations about: "Per-Olof Westlund"

Showing result 1 - 5 of 7 swedish dissertations containing the words Per-Olof Westlund.

  2. 1. Some aspects of the slow motion problem in the NMR-relaxation theory : a theoretical study of high spin systems

    Author : Per-Olof Westlund; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : A theory of nuclear spin relaxation in paramagnetic complexes, allowing for the electron spin relaxation to be in the slow motion regime, is presented. The lattice i3 described in terms of the electron Zeeman interaction, a zero field splitting (ZFS) and a Markov operator for the relevant classical degrees of freedom. READ MORE

  4. 2. Analysis of NMR Spin-lattice Relaxation Dispersion on Complex Systems

    Author : Yang Huang; Per-Olof Westlund; Arnold Maliniak; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NMRD; relaxation theory; hydration; MD; FFC; PrxV; OEC complex; ZSM-5; BMIM [PF6; ]; fysikalisk kemi; Physical Chemistry;

    Abstract : This thesis focus on the analysis of spin-lattice NMRD relaxation profilesmeasured in various complex systems such as proteins, zeolites and ionicliquids. Proton, deuterium and fluoride T1-NMRD relaxation profiles wereobtained from a fast-field cycling (FFC) instrument. READ MORE

  5. 3. Simulation of Relaxation Processes in Fluorescence, EPR and NMR Spectroscopy

    Author : Pär Håkansson; Per-Olof Westlund; Yehudi K. Levine; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; EPR; NMR; Energy migration; bicontinuous cubic phase; Stochastic Liouville Equation; Brownian Dynamics; Fysikalisk kemi; Physical chemistry; Fysikalisk kemi; Physical Chemistry; fysikalisk kemi;

    Abstract : Relaxation models are developed using numerical solutions of the Stochastic Liouville Equation of motion. Simplified descriptions such as the stochastic master equation is described in the context of fluorescence depolarisation experiments. Redfield theory is used in order to describe NMR relaxation in bicontinuous phases. READ MORE

  6. 4. On the mechanism of Urea-induced protein denaturation

    Author : Matteus Lindgren; Per-Olof Westlund; Arnold Maliniak; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chemical denaturation; Protein unfolding; urea; MD simulations; NMR spectroscopy; Biophysical chemistry; Biofysikalisk kemi; fysikalisk kemi; Physical Chemistry;

    Abstract : It is well known that folded proteins in water are destabilized by the addition of urea. When a protein loses its ability to perform its biological activity due to a change in its structure, it is said to denaturate. READ MORE

  7. 5. A new approach to the analyses of fluorescence depolarisation experiments in the presence of electronic energy transport

    Author : Oleg Opanasyuk; Lennart B-Å Johansson; Per-Olof Westlund; Yehudi Levine; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; electronic energy transfer; donor-donor energy migration; extended Förster theory; fluorescence depolarisation; two-photon excitation; computer simulations; genetic algorithms; fysikalisk kemi; Physical Chemistry;

    Abstract : A new and general procedure is described for a detailed analysis of time-resolved fluorescence depolarisation data in the presence of electronic energy migration. An isotropic ensemble of bifluorophoric molecules (D1-R-D2) has been studied to demonstrate its utility. READ MORE