Search for dissertations about: "radical mechanism"

Showing result 1 - 5 of 118 swedish dissertations containing the words radical mechanism.

  2. 1. Allosteric Regulation and Radical Transfer in Ribonucleotide Reductase

    Author : Karl-Magnus Larsson; Pär Nordlund; Derek Logan; Roger Kornberg; Stockholms universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; allosteric regulation; substrate specificity; ribonucleotide reductase; radical; Biochemistry; Biokemi;

    Abstract : The stability of biological life over time requires that the integrity of the genetic material of an organism, the genome, be maintained as it is passed on from one generation to the next. All known cellular life has DNA-based genomes, which are duplicated before each cell division in a process called replication. READ MORE

  4. 2. Making Radical Cations Live Longer

    Author : Ola Persson; Kemisk fysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; spin trapping.; 3-hexafluoropropan-2-ol; 3; 1; thallium III -based oxidants; Radical cations; electron paramagnetic resonance; Physics; Fysik; Chemistry; Kemi;

    Abstract : The acid-catalyzed rearrangement of 1,4,5,8-tetramethylnaphthalene was used to determine the acidity of media used for EPR spectral studies of radical cations. The radical cations of methyl-substituted naphthalenes were shown to undergo dimerization reactions. READ MORE

  5. 3. Quantum Chemical Studies of Radical Cation Rearrangement, Radical Carbonylation, and Homolytic Substitution Reactions

    Author : Daniel Norberg; Nessima Salhi-Benachenhou; Sten Lunell; Tim Clark; Uppsala universitet; []
    Keywords : Quantum chemistry; quantum chemistry; coupled-cluster; density functional theory; meta-GGA; reaction mechanism; potential energy surface; isomerization; fragmentation; dissociation; condensation; addition; SH2; hydrogen abstraction; iodine atom transfer; complex; weakly interacting system; hyperfine coupling constant; Kvantkemi;

    Abstract : Quantum chemical calculations have been performed to investigate radical cation rearrangement, radical carbonylation, and homolytic substitution reactions of organic molecules. The rearrangement of the bicyclopropylidiene radical cation to the tetramethyleneethane radical cation is predicted to proceed with stepwise disrotatory opening of the two rings. READ MORE

  6. 4. Understanding the mechanisms behind atom transfer radical polymerization : exploring the limit of control

    Author : Helena Bergenudd; Mats Jonsson; Eva Malmström Jonsson; David M Haddleton; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; polymerization; controlled radical polymerization; atom transfer radical polymerization; kinetics; catalysis; electrochemistry; Polymer chemistry; Polymerkemi;

    Abstract : Atom transfer radical polymerization (ATRP) is one of the most commonly employed techniques for controlled radical polymerization. ATRP has great potential for the development of new materials due to the ability to control molecular weight and polymer architecture. READ MORE

  7. 5. Essential conserved active site residues in class Ia ribonucleotide reductase from Escherichia coli : identification of radical reaction intermediates and radical transfer intermediates

    Author : Annika Persson; Marc Fontecave; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Molecular Biology; molekylärbiologi;

    Abstract : The enzyme ribonucleotide reductase catalyzes the reduction of ribonucleotides to the corresponding deoxyribonucleotides, the building blocks of DNA. The class Ia enzyme from Escherichia coli consists of two homodimeric subunits denoted protein R1 and protein R2, each inactive alone. READ MORE