Search for dissertations about: "methyl transfer"

Showing result 1 - 5 of 60 swedish dissertations containing the words methyl transfer.

  2. 1. Quantum Chemical Modeling of Enzymatic Methyl Transfer Reactions

    Author : Polina Georgieva; Fahmi Himo; Nino Russo; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; reaction mechanism; Theoretical chemistry; Teoretisk kemi;

    Abstract : In this thesis, quantum chemistry, in particular the B3LYP density functional method, is used to investigate a number of methyl transfer enzymes. Quantum chemical methodology is today a very important tool in the elucidation of properties and reaction mechanisms of enzyme active sites. READ MORE

  4. 2. Exploring Electron Transfer Dynamics of Novel Dye Sensitized Photocathodes : Towards Solar Cells and Solar Fuels

    Author : Lei Zhang; Leif Hammarström; Yiying Wu; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Electron transfer; Laser spectroscopy; Femtosecond spectroscopy; Transient absorption; NiO; DSSCs; DSSFDs; Charge separation; Solar energy conversion; Nanosecond photolysis; Photophysics; Kemi med inriktning mot kemisk fysik; Chemistry with specialization in Chemical Physics;

    Abstract : The design of dyes for NiO-based dye-sensitized solar cells (DSSCs) has drawn attention owing to their potential applications in photocatalysis and because they are indispensable for the development of tandem dye-sensitized solar cells. The understanding of the electron transfer mechanisms and dynamics is beneficial to guide further dye design and further improve the performance of photocathode in solar cells and solar fuel devices. READ MORE

  5. 3. Quantum Chemical Cluster Modeling of Enzymatic Reactions

    Author : Rongzhen Liao; Fahmi Himo; Robert Deeth; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; cluster approach; density functional theory; B3LYP; enzyme; mechanism; dinuclear; trinuclear; zinc; tungsten; hydrolysis; decarboxylation; formaldehyde oxidation; hydration; methyl transfer; Quantum chemistry; Kvantkemi; organisk kemi; Organic Chemistry;

    Abstract : The Quantum chemical cluster approach has been shown to be quite powerful and efficient in the modeling of enzyme active sites and reaction mechanisms. In this thesis, the reaction mechanisms of several enzymes have been investigated using the hybrid density functional B3LYP. READ MORE

  6. 4. Formation and function of wobble uridine modifications in transfer RNA of Saccharomyces cerevisiae

    Author : Bo Huang; Anders Byström; Monica Rydén-Aulin; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Transfer RNA; Modified nucleoside; Elongator complex; Wobble uridine; Decoding; Molecular biology; Molekylärbiologi;

    Abstract : Transfer RNAs (tRNAs) act as adaptor molecules in decoding messenger RNA into protein. Frequently found in tRNAs are different modified nucleosides, which are derivatives of the four normal nucleosides, adenosine (A), guanosine (G), cytidine (C), and uridine (U). READ MORE

  7. 5. Modeling of methyl transfer reactions in S-Adenosyl-L-Methionine dependent enzymes

    Author : Polina Velichkova; Fahmi Himo; Margareta Blomberg; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Theoretical chemistry; Teoretisk kemi;

    Abstract : A very important trend for studying biomolecules is computational chemistry. In particular, nowadays it is possible to use theoretical methods to figure out the catalytic mechanism of enzyme reactions. READ MORE