Sökning: "Electron transfer"

Visar resultat 6 - 10 av 524 avhandlingar innehållade orden Electron transfer.

  1. 6. Regulation of Proton Coupled Electron Transfer from Amino Acids in Artificial Model Systems: A Mechanistic Study

    Författare :Martin Sjödin; Leif Hammarström; Jan Davidsson; G. Daniel Nocera; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; Proton Coupled Electron Transfer; Tyrosine; Tryptophan; Electron Transfer; Hydrogen bond; Photosystem II; Proton transfer; Radical protein; Fysikalisk kemi; Physical chemistry; Fysikalisk kemi;

    Sammanfattning : Amino acid radicals are key redox intermediates in several natural enzymes including Cytochrome c peroxidase, DNA photolyase, ribonucletide reductase, cytochrome c oxidase and photosystem II. Electron transfer from amino acids is often coupled to deprotonation and this thesis concerns the coupling of electron transfer from tyrosine and tryptophan to trisbipyridineruthenium(III) with deprotonation in model complexes. LÄS MER

  3. 7. Electron Transfer in Ruthenium-Manganese Complexes for Artificial Photosynthesis : Studies in Solution and on Electrode Surfaces

    Författare :Malin L. A. Abrahamsson; Gerald J. Meyer; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Artificial photosynthesis; electron transfer; energy transfer; ruthenium; manganese; titanium dioxide; Fysik; Physics; Fysik; Physical Chemistry; fysikalisk kemi;

    Sammanfattning : In today’s society there is an increasing need for energy, an increase which for the most part is supplied by the use of fossil fuels. Fossil fuel resources are limited and their use has harmful effects on the environment, therefore the development of technologies that produce clean energy sources is very appealing. LÄS MER

  4. 8. Photoinduced Electron and Energy Transfer in Π-Conjugated Systems

    Författare :Melina Gilbert Gatty; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fs spectroscopy; exciton coupling; conjugated porphyrin oligomers; ps spectroscopy; molecular wire; electron transfer; conformational analysis; self‒assembly; anthracene dendrimers; energy transfer; fluorescence anisotropy;

    Sammanfattning : Photosynthesis is a fascinating process that provides food and oxygen. In this thesis, focus is on understanding and controlling the early processes of photosynthesis, namely photoinduced energy and electron transfer. LÄS MER

  5. 9. Proton, Electron, and O2 transfer in Cytochrome c Oxidase

    Författare :Lina Salomonsson; Peter Brzezinski; Marilyn Gunner; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cytochrome c oxidase; electron transfer; proton transfer; proton pumping; kinetic isotope effect; Biochemistry; Biokemi;

    Sammanfattning : In mitochondria and aerobic bacteria energy conservation involves electron transfer through the membrane-bound protein of the respiratory chain to oxygen. Cytochrome c oxidase (CcO) catalyzes the reduction of oxygen to water. Part of the energy released in this reaction is used to pump protons across the membrane. LÄS MER

  7. 10. Synthesis and Photoinduced Electron Transfer of Donor-Sensitizer-Acceptor Systems

    Författare :Yunhua Xu; Licheng Sun; Björn Åkermark; Jean-Pierre Sauvage; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Artificial photosynthesis; Dye-sensitized solar cells; Electron donors; Dinuclear ruthenium complexes; Electron transfer; Organic chemistry; Organisk kemi;

    Sammanfattning : Artificial systems involving water oxidation and solar cells are promising ways for the conversion of solar energy into fuels and electricity. These systems usually consist of a photosensitizer, an electron donor and / or an electron acceptor. LÄS MER