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Visar resultat 1 - 5 av 16 avhandlingar som matchar ovanstående sökkriterier.
1. Regioselective acylation of carbohydrates and polyester synthesis by lipase catalysis
Sammanfattning : The lipases' high regio- and enantioselectivity, activity inorganic solvent and environmentally compatible reactionconditions have made lipase-catalysis based synthesis anattractive alternative to conventional synthetic methods inorganic chernistry and a new synthetic tool in polymerchemistry.The regioselective acylation of methy1 glycopyranosides wereinvestigated using several serine hydrolases. LÄS MER
2. Non-Linear Vibration and Dynamic Fracture Mechanics of Bridge Cables
Sammanfattning : In the present work, the non-linear vibrations and the corresponding dynamic fracture mechanics of cables of cable-stayed bridges are studied. The cables are among the most critical components in cable-stayed bridges and there are different damage sources such as corrosion, vibration, fatigue and fretting fatigue that can significantly affect them, thereby reducing the cable’s service life and even producing their failure. LÄS MER
3. Development of catalytic enantioselective C-C bond-forming and cascade transformations by merging homogeneous or heterogeneous transition metal catalysis with asymmetric aminocatalysis
Sammanfattning : Chiral molecules play a central role in our daily life and in nature, for instance the different enantiomers or diastereomers of a chiral molecule may show completely different biological activity. For this reason, it is a vital goal for synthetic chemists to design selective and efficient methodologies that allow the synthesis of the desired enantiomer. LÄS MER
4. Eco-friendly and Catalytic Surface Engineering of Cellulose and Nanocellulose
Sammanfattning : The non-stop use of petroleum-based materials such as plastics can generate significant environmental problems, including pollution of the oceans and increased CO2 levels, and cause diseases like cancer due to the starting monomers. Consequently, increased use of sustainable and non-toxic polymers and monomers is required to address these issues. LÄS MER
5. Development of highly enantioselective organocatalyzed transformations
Sammanfattning : .... LÄS MER