Search for dissertations about: "Antarctica"

Showing result 11 - 15 of 117 swedish dissertations containing the word Antarctica.

  2. 11. Gene expression and regeneration in ophiuroids: A study of transcriptional activity and regeneration in the temperate Amphiura filiformis and Antarctic Ophionotus victoriae

    Author : Gavin Burns; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; echinoderm; regeneration; ophiuroid; gene expression; antarctica;

    Abstract : Regeneration, in which lost or damaged tissues are re-grown, is a common phenomenon amongst animals and especially so within the ophiuroids (brittle stars) of the phylum echinodermata. The process of regeneration begins with the injury event followed by a period of cell and tissue reorganization which results in wound healing and tissue re-growth. READ MORE

  4. 12. Biogenic Halocarbons in Polar Sea Ice

    Author : Anna Granfors; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Volatile biogenic halocarbons; Sea ice; Antarctica; ice-air flux; gases;

    Abstract : Sea ice is to date a rather poorly investigated part of the cycling of volatile halogenated organic compounds, halocarbons. These compounds are natural sources of reactive iodine and bromine to the atmosphere, and are produced in the marine environment. READ MORE

  5. 13. On Biogenic Halocarbons in Antarctic Waters

    Author : Erik Mattsson; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Volatile biogenic halocarbons; Antarctica; Southern Ocean; Sea ice; Snow; Air-sea exchange;

    Abstract : Little is known regarding the distribution of naturally produced volatile halogenated organic compounds, halocarbons, in Antarctic waters and the contribution of these waters to the global atmospheric load of halogens. In the atmosphere, halocarbons are degraded by photolysis, and form reactive halogen radicals. READ MORE

  6. 14. Diatom and Sedimentological Investigations on West Antarctic Shelf Sediment

    Author : Charlotte Sjunneskog; Bjorg Stabell; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Antarctica; climate change; diatom abundance; geochemistry; Geovetenskap; Earth sciences; Geovetenskap; Quarternary Geology; kvartärgeologi;

    Abstract : Climate and environmental change following the retreat of the last glacial ice sheet in the Antarctic Peninsula has been interpreted, employing diatom abundance, relative abundance of Chaetoceros resting spores and diatom assemblages as proxies. These together with sedimentological data and radiocarbon dating, suggest four major events that can be further subdivided. READ MORE

  7. 15. Rational redesign of Candida antarctica lipase B

    Author : Anders Magnusson; Karl Hult; Bernhard Hauer; KTH; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Biochemistry; Candida antarctica lipase B; rational redesign; secondary alcohols; substrate-assisted catalysis; S-selective; entropy; aldolase; stereospecificity pocket; oxyanion hole.; Biokemi; Biochemistry; Biokemi;

    Abstract : This thesis describes the use of rational redesign to modify the properties of the enzyme Candida antarctica lipase B. Through carefully selected single-point mutations, we were able to introduce substrate-assisted catalysis and to alter the reaction specificity. READ MORE