Search for dissertations about: "a e"

Showing result 1 - 5 of 13207 swedish dissertations containing the words a e.

  1. 1. Early Cambrian Problematic Lophotrochozoans and Dilemmas of Scleritome Reconstructions

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Cecilia M Larsson; Lars E Holmer; Christian B Skovsted; Anette E S Högström; John S Peel; Glenn A Brock; Michael J Vendrasco; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Problematica; scleritome; Trachyplax; tommotiid; Cambrian; South Australia; North Greenland; Earth Science with specialization in Historical Geology and Palaeontology; Geovetenskap med inriktning mot historisk geologi och paleontologi;

    Abstract : The emergence and radiation of metazoan body plans around the Precambrian/Cambrian boundary, some 500-600 million years ago, seems to be concordant with the appearance and diversification of preservable hard parts. Several Precambrian soft-bodied, multicellular organisms most likely represent stem-group bilaterians, but their fossil record is rather sparse. READ MORE

  2. 2. Nitrate stable isotopes and major ions in snow and ice from Svalbard

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Carmen Paulina Vega Riquelme; V. A. Pohjola; R. Pettersson; E. Isaksson; C. E. Bøggild; Kumiko Goto-Azuma; [2014]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; nitrate stable isotopes; nitrate; NOx proxies; ice cores; percolation; ion relocation; Svalbard; stabila isotoper av nitrat; nitrat; indikator för kväveoxider; iskärnor; perkolation; joniska omlokalisering; Svalbard; Earth Science with specialization in Physical Geography; Geovetenskap med inriktning mot naturgeografi;

    Abstract : Increasing atmospheric reactive nitrogen (Nr), as consequence of human activities, has generated accumulation of nitrate (NO3-) in Arctic regions. The Arctic has fragile nitrogen limited ecosystems that can be altered by increases of dry or wet deposition of Nr. READ MORE

  3. 3. Biomimetic Iron Complexes involved in Oxygenation and Chlorination A Theoretical Study

    University dissertation from Stockholm : Department of Physics, Stockholm University

    Author : Holger Noack; Margareta R. A. Blomberg; Per E. M. Siegbahn; Martin Kaupp; [2010]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; biomimetic; iron; density functional theory; intradiol; chlorination; adpic acid; diamond core; reactivity; NATURAL SCIENCES Chemistry Inorganic chemistry Bio-inorganic chemistry; NATURVETENSKAP Kemi Oorganisk kemi Bio-oorganisk kemi; NATURAL SCIENCES Chemistry Theoretical chemistry; NATURVETENSKAP Kemi Teoretisk kemi; Chemical Physics; kemisk fysik;

    Abstract : Biomimetic chemistry is directed towards the simulation of enzymatic reactivity with synthetic analogues. In this thesis a quantum chemical method has been employed to study the mechanism of highly reactive iron-oxo complexes involved in oxygenation and chlorination of organic substrates. READ MORE

  4. 4. The evolutionary history of Geum (Rosaceae, Colurieae) : a study of ancient allopolyploid speciation

    University dissertation from Stockholm : Botaniska institutionen

    Author : Jenny E. E. Smedmark; Birgitta Bremer; Pamela S. Soltis; [2004]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Geum; Rosaceae; molecular phylogeny; allopolyploidy; morphological evolution; gynoecial development; NATURAL SCIENCES; NATURVETENSKAP;

    Abstract : Allopolyploid speciation plays an important role in flowering plant evolution. Its contribution to diversity has been suggested to be significant in Geum. READ MORE

  5. 5. Visual thinking, visual speech : a semiotic perspective on meaning-making in molecular life science

    University dissertation from Linköping : Linköping University Electronic Press

    Author : Carl-Johan Rundgren; Lena A E Tibell; Richard Hirsch; Ute Harms; [2008]
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Molecular life science; visualizations; metaphors; help-words; SOCIAL SCIENCES Social sciences Education Subject didactics; SAMHÄLLSVETENSKAP Socialvetenskap Pedagogik Ämnesdidaktik;

    Abstract : Molecular life science has become one of the fastest-growing fields of scientific and technical innovation. An important issue for tomorrow’s education is to meet the challenge posed by various facets of molecular life science. READ MORE