Sökning: "Antarctica"

Visar resultat 21 - 25 av 117 avhandlingar innehållade ordet Antarctica.

  1. 21. Enantioselective biotransformations using engineered lipases from Candida antarctica

    Författare :Karin Engström; Jan-E. Bäckvall; Manfred T. Reetz; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; protein engineering; directed evolution; kinetic resolution; dynamic kinetic resolution; biotransformation; lipase; organisk kemi; Organic Chemistry;

    Sammanfattning : Enzymes are attractive catalysts in organic synthesis since they are efficient, selective and environmentally friendly. A large number of enzyme-catalyzed transformations have been described in the literature. LÄS MER

  3. 22. Engineering of Candida antarctica Lipase A and B

    Författare :Johanna Löfgren; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : In organic chemistry, it is often desirable to have an efficient process yieldingpure product and not too much waste. When applicable, it is also desirable tohave a high enantioselective outcome. Enzymes are often displaying high regio-,chemo- and stereoselectivity. LÄS MER

  4. 23. Ocean circulation in the Amundsen Sea, West Antarctica

    Författare :Ola Kalén; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ocean; currents; icebergs; remote sensing; ocean model;

    Sammanfattning : The increase of mass loss from the Antarctic Ice Sheet is a significant contribution to global sea level rise. The most rapid changes are occurring in the Amundsen Sea area, where the thinning of the floating glaciers is assumed to be driven by the ocean. LÄS MER

  5. 24. Late Tertiary glaciations and climate dynamics in Antarctica : evidence from the Sirius Group, Mount Fleming, Dry Valleys

    Författare :Arjen Peter Stroeven; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER

  7. 25. Determination of Fat-Soluble Vitamins in Foods Based on Supercritical Fluid Extraction

    Författare :Charlotta Turner; Kemiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Supercritical fluid extraction; Solvent collection; Solid phase trapping; SFE; Selectivity; Retinol; Milk powder; Lipase; Food; Enzymatic hydrolysis; Alcoholysis; Candida antarctica; Tocopherol; Vitamins; Analytical chemistry; Analytisk kemi;

    Sammanfattning : Sample clean-up methodologies based on supercritical fluid extraction (SFE) have been developed for determination of fat-soluble vitamins in foods. This thesis focuses on method development, stressing important issues concerning sample pre-treatment, extraction conditions and collection parameters. LÄS MER