Sökning: "ferric iron"

Visar resultat 11 - 15 av 26 avhandlingar innehållade orden ferric iron.

  1. 11. The High-Pressure Study on the Fe - O System: Thermodynamics and Phase Transitions of Iron Ferrite (FeFe2O4)

    Författare :Olga Shebanova; Peter Lazor; Viktor Struzhkin; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; high pressure; high temperature; thermodynamics; phase transitions; magnetite; Geovetenskap; Earth sciences; Geovetenskap; mineralogi; petrologi och tektonik; Mineral Chemistry; Petrology and Tectonics;

    Sammanfattning : Knowledge about the stability of phases and their relationships in the Fe-O system at high pressures and temperatures is essential in implications of the multifarious states of iron oxides for models of the evolution of the Earth. In this respect, the iron ferrite magnetite (FeFe2O4) plays a significant role since it participates in the control of geochemistry of ferric iron, and hence oxygen fugacity in the Earth`s deep interior. LÄS MER

  3. 12. Genomics, physiology and applications of cold tolerant acidophiles

    Författare :Maria Liljeqvist; Mark Dopson; Ricardo Amilis; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Psychrotolerant acidophiles have gained increasing interest because of their importance in biomining operations in environments where the temperature falls well below 10°C during large parts of the year.Acidithiobacillus ferrivorans is the only characterized acidophile with the ability to live a psychrotrophic lifestyle and is able to oxidize ferrous iron and inorganic sulfur compounds at low temperature. LÄS MER

  4. 13. Hydrogen diffusion and storage mechanisms in diopside

    Författare :Rickard Sundvall; Henrik Skogby; Alasdair Skelton; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mineralogy; Mineralvetenskap; mineralogi; petrologi och geokemi; Mineralogy; Petrology and Geochemistry;

    Sammanfattning : Hydrogen is a widespread trace element in many nominally anhydrous minerals (minerals without water or hydroxyl ions in their structural formula) from the Earth's crust and mantle. The hydrogen is normally incorporated in the form of hydroxyl ions and can be regarded as structurally bound water. LÄS MER

  5. 14. Mechanisms of formation and protection against oxidative DNA damage in vitro and in vivo

    Författare :Peter Svoboda; Ralf Morgenstern; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical Biology; fysikalisk biologi;

    Sammanfattning : Oxidative DNA damage has been linked to cancer and aging as well as other diseases. The aim of this thesis was to study the mechanisms for DNA damage generated in cells or in vitro systems by ionizing radiation or transition metals like iron ions. LÄS MER

  7. 15. Quantification of mineral weathering rates in sulfidic mine tailings under water-saturated conditions

    Författare :Magdalena Gleisner; Docent Roger Herbert; Professor Emeritus Rolf Hallberg; Dr. Magnus Land; Professor Patrick Crill; Mats Åström; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mine tailings; pyrite; sulfides; weathering; oxygen availability; Acidithiobacillus ferrooxidans; Earth sciences; Geovetenskap;

    Sammanfattning : Tailings are a fine-grained waste product produced during the metal recovery process. Tailings consist mostly of different silicates but also sulfides (e.g. pyrite), since 100 % metal recovery is not possible. LÄS MER