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Showing result 1 - 5 of 38 swedish dissertations matching the above criteria.

  2. 1. Influence of exposure patterns and oxidation in UVR-induced cataract

    Author : Marcelo Ayala; Karolinska Institutet; Karolinska Institutet; []
    Keywords : Cataract; ultraviolet radiation; lens; in vivo; rats; oxidative process; time;

    Abstract : Background: Ultraviolet radiation (UVR) is one among a number of possible factors that may lead to the development of cataract. Whereas induction of cataract as the result of onetime exposure to UVR has been studied extensively, the data on lens damage resulting from repeated exposures to UVR are scarce. READ MORE

  4. 2. Natural products from Bolivian plants and other sources

    Author : Marcelo Bascope; Centrum för analys och syntes; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Växtbiokemi; Organic chemistry; Organisk kemi; Plant biochemistry; Bolivian plants; ESIMS oxygen adducts; Myrothecium roridum; Silphion persicum; Cyathea boliviana; Rheedia acuminata; Heliconia episcopalis; Iryanthera juruensis; Aniba canelilla; Natural products;

    Abstract : The present research was focused on the phytochemical research of Bolivian plants; a) two medicinal ones Aniba canelilla and Iryanthera juruensis, both plants showed to have compounds with biological activity in different fields. Even though Aniba canelilla was studied before, new compounds were identified in this investigation. READ MORE

  5. 3. Secondary Metabolites from Bolivian Plants- Isolation and Characterization

    Author : Marcelo Davila; Centrum för analys och syntes; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Phytochemistry; Natural Prodcuts;

    Abstract : Nature has been recognized as a rich source of potentially useful chemicals. Throughout the years, phytochemical studies have led to the discovery of an enormous number of natural products, their chemical diversity is unique and many of them possess various biological activities. READ MORE

  6. 4. Designing Interactive Learning Environments to Support Learners’ Understanding in Complex Domains

    Author : Marcelo Milrad; Växjö universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; interactive learning environments; complex domains; social constructivism; collaborative learning; construction kits; system dynamics simulations; collaborative modelling tools.; Information technology; Informationsteknologi; Cognitive science; Kognitionsvetenskap; Media Technology; Media Technology;

    Abstract : This dissertation focuses on the design of interactive learning environments (ILEs) to support learning in complex domains. Previous research efforts in this field indicate that we lack a well-articulated design framework with sufficient detail to take us from a socially-situated, problem-based, collaborative learning perspective to the design of a particular learning environment for a particular subject domain. READ MORE

  7. 5. Diagenesis and Sequence Stratigraphy : an integrated approach to constrain evolution of reservoir quality in sandstones

    Author : João Marcelo Ketzer; Karl Ramseyer; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Geovetenskap; Earth sciences; Geovetenskap; mineralogi; petrologi och tektonik; Mineral Chemistry; Petrology and Tectonics;

    Abstract : Diagenesis and sequence stratigraphy have been formally treated as two separate disciplines in sedimentary petrology. This thesis demonstrates that synergy between these two subjects can be used to constrain evolution of reservoir quality in sandstones. READ MORE