Sökning: "trace fossil"
Visar resultat 1 - 5 av 18 avhandlingar innehållade orden trace fossil.
1. The Evolutionary Significance of Cambrian Ecdysozoan Trace Fossils
Sammanfattning : The origin of most of the animal phyla is tied to the Cambrian explosion, a rapid diversification event that took place from about 540 million years ago. This diversification is coupled with a great number of concurrent metazoan body plan innovations such as the development of the coelom, antagonistic muscles and a through-gut. LÄS MER
2. Paleoceanographic implications of major and trace element distributions in fossil, marine sediments
Sammanfattning : .... LÄS MER
3. Fate of Cu, Cr, As and some other trace elements during combustion of recovered waste fuels
Sammanfattning : The increased use of biomass and recovered waste fuels in favor of fossil fuels for heat and power production is an important step towards a sustainable future. Combustion of waste fuels also offers several advantages over traditional landfilling, such as substantial volume reduction, detoxification of pathological wastes, and reduction of toxic leaches and greenhouse gas (methane) formation from landfills. LÄS MER
4. From Polysaccharides to Functional Materials for Trace Pharmaceutical Adsorption
Sammanfattning : The transition to bioeconomy will reduce our dependency on fossil fuels as well as contribute to a more sustainable society. Within this framework, exploitation and development of renewable substitutes to petroleum-based products provides feasible roadmap for the material design. LÄS MER
5. Geochemical and sedimentary signatures of Phanerozoic events
Sammanfattning : Geological and biological catastrophic events have occurred repeatedly in the Earth's history, leaving traces in the global stratigraphical record in the form of sedimentary features, geochemical anomalies and biotic turnovers. This thesis focuses on the sedimentological and geochemical signatures of several key events in the Phanerozoic stratigraphical record, and aims to interpret the different signals and the causal mechanisms behind each of these events. LÄS MER