Sökning: "paramagnetic species"

Visar resultat 1 - 5 av 19 avhandlingar innehållade orden paramagnetic species.

  1. 1. Analysis and speciation of organic phosphorus in environmental matrices : Development of methods to improve 31P NMR analysis

    Författare :Johan Vestergren; Gröbner Gerhard; Jurgen Schleucher; Ulrik Ilstedt; Per Persson; Reiner Giesler; Benjamin L. Turner; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Phosphorus; soil; 31P NMR; NaOH EDTA; terrestrial; sulfide; speciation; bioavailability; paramagnetic; humus; boreal; tropical; multi-dimensional; agroforestry; chronosequence; fysikalisk kemi; Physical Chemistry;

    Sammanfattning : Phosphorus (P) is an essential element for life on our planet. It is central in numerous biochemical processes in terrestrial and aqueous ecosystems including food production; and it is the primary growth-limiting nutrient in some of the world’s biomes. LÄS MER

  2. 2. Tuning of Energy and Electron Transfer Rates in Donor-Bridge-Acceptor Systems

    Författare :Karin Pettersson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; electron transfer; electronic coupling; paramagnetic species; superexchange; Donor-bridge-acceptor system; spectroscopy.; porphyrin; sequential electron transfer; Förster energy transfer; energy transfer;

    Sammanfattning : The intramolecular processes of Donor-Bridge-Acceptor (D-B-A) systems have been investigated by spectroscopic methods. The systems consist of porphyrin donors and acceptors linked by oligo-p-phenyleneethynylene bridges. LÄS MER

  3. 3. Intramolecular processes in porphyrin-based donor-bridge-acceptor systems

    Författare :Karin Pettersson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Donor-bridge-acceptor system; paramagnetic species; spectroscopy; porphyrin; super-exchange electron transfer; sequential electron transfer;

    Sammanfattning : .... LÄS MER

  4. 4. Folding and Structure of Azurin - The Influence of a Metal

    Författare :Johan Leckner; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; azurin; metal cofactor; disulfide bond; protein folding; solution structure; protein stability; paramagnetic NMR;

    Sammanfattning : The structural role of the metal in the protein azurin from Pseudomonas aeruginosa has been a long standing question. Azurin belongs to the cupredoxin family and is a 128 residue beta-barrel protein of greek-key topology. LÄS MER

  5. 5. Iron-nitrogen containing carbon catalysts for oxygen reduction in fuel cells

    Författare :Caroline Janson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; active site; mesoporous carbon; fuel cell; electron paramagnetic resonance; oxygen reduction reaction; cathode catalyst; non-precious metal catalyst;

    Sammanfattning : New solutions to efficiently convert energy are needed to mitigate global climate changes and sustain the needs of the growing population. An energy device with high potential is the proton exchange membrane (PEM) fuel cell. PEM fuel cells can convert chemical energy to electrical energy with extraordinary high conversion efficiency. LÄS MER