Sökning: "uranyl"

Visar resultat 1 - 5 av 11 avhandlingar innehållade ordet uranyl.

  1. 1. DNA Binding of Metal Complexes. A Spectroscopic Study of Trigonal Ru(II)phenanthroline Complexes and Uranyl(VI) Ion with Respect to Specific Interactions with DNA

    Författare :Catharina Hiort; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; uranyl; nucleic acids; optical probes;

    Sammanfattning : The interaction of metal complexes with nucleic acids has attracted attention owing to their potentials as optical probes, probes of chirality, and for use as artificial restriction enzymes. To understand the underlying mechanisms in these contexts we studied the binding to DNA of the enantiomers of two chiral ruthenium(II) metal complexes ([Ru(phen)3]2+ and [Ru(phen)2]2+DPPZ) phen=1,10-phenanthroline, DPPZ=dipyrido[3,2-a:2',3'-c]phenazine, and of the linear uranium(VI) complex, uranyl ([UO2]2+), using linear dichroism, circular dichroism and luminescence, as well as nuclear magnetic resonance spectroscopy. LÄS MER

  3. 2. Theoretical Reflections of Solvation in Polar Media

    Författare :Daniel Hagberg; Beräkningskemi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; kvantkemi; Teoretisk kemi; quantum chemistry; Theoretical chemistry; Coordination; Water; Uranyl; Intermolecular forces; Simulation; Dielectric; Cluster; Hofmeister series; Ion; Interaction; Dipole;

    Sammanfattning : Using experiments it is rather easy to measure things on the macroscopic length scale, while it is much harder to measure something in the microscopic world like molecular structure. The opposite is true in theoretical chemistry. LÄS MER

  4. 3. Stability of UO2 in systems containing radiolytic oxidants : The role of uranyl peroxide species

    Författare :Junyi Li; Mats Jonsson; Peter Burns; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; UO2; studtite; XPS; radiolysis; UO2; studtit; XPS; radiolys; Kemi; Chemistry;

    Sammanfattning : Nuclear power constitutes a major pillar on the global energy market, and it will most probably increase in importance as fossil fuels are gradually phased out. The main problem connected to nuclear power is the generation of highly radiotoxic spent nuclear fuel (95% UO2 and 5% radioactive fission products and heavier actinides). LÄS MER

  5. 4. Theoretical Actinide Chemistry – Methods and Models

    Författare :Pernilla Wåhlin; Ulf Wahlgren; Luis Seijo; Stockholms universitet; []
    Nyckelord :Actinide; Quantum chemistry; Wave function; Density functional theory; Solvent models; Water exchange; Molecular configurations; Multi-reference density functional method; teoretisk fysik; Theoretical Physics;

    Sammanfattning : The chemistry of actinides in aqueous solution is important, and it is essential to build adequate conceptual models and develop methods applicable for actinide systems. The complex electronic structure makes benchmarking necessary. LÄS MER

  7. 5. Precipitation and fixation of uranium in reduced environment : simulation in a continuous culture of sulfate-reducing bacteria

    Författare :Ulf G. Edvardsson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The precipitation and fixation of the uranyl ion (U022+), in a reduced environment, has been investigated by means of continuous cultivation of sulphate-reducing bacteria. The continuous culture sustem made it possible to study the chemical reactions under physico-chemical conditions (e.g. LÄS MER