Essays about: "paleobiologi"

Showing result 6 - 10 of 18 essays containing the word paleobiologi.

1. 6. Evolutionary History of Nickel-Dependent Enzymes : Implications for the Origins of Life.

   University essay from Uppsala universitet/Institutionen för biologisk grundutbildning; Uppsala universitet/Paleobiologi

   Author : Reem Hallak; [2021]
   Keywords : nickel; enzymes; redox; origin of life; LUCA; ancestral reconstruction; phylogeny; phyletic patterns;

   Abstract : Nickel enzymes have been suggested, through numerous phylogenetic studies, to have been among the very first catalytic compounds on the early Earth, possibly present in the last universal common ancestor (LUCA) or prior to the onset of life. This is because of the type of reactions catalyzed by some of these enzymes, the nature of organisms that utilize them, their distribution in the tree of life, and their key roles in what is now thought of as possibly one of the oldest carbon fixation pathways, the Wood-Ljungdahl (WL) pathway. READ MORE

3. 7. Study of the Taxonomy of Carnivores from the Eocene-Oligocene of the Quercy Area, France

   University essay from Uppsala universitet/Paleobiologi

   Author : Julien van der Hoek; [2021]
   Keywords : Quercy; Carnivora; Amphicyonidae; Eocene; Oligocene; taxonomy;

   Abstract : The Quercy area of France is an important site for mammal palaeontology, yet 19th century collections of this area, such as the one in the Department of Palaeobiology, Naturhistoriska riksmuseet, remain understudied due to not being well updated taxonomically and correlated stratigraphically. An updated taxonomy was created for the postcranial material of the collections, as well as the dental material originally identified to the amphicyonid genera Amphicyon, Haplocyon and Pseudocyon through study of morphological characteristics and measurements. READ MORE

4. 8. Geobiological Impacts of PalaeozoicLand Plant Evolution

   University essay from Uppsala universitet/Paleobiologi

   Author : Camille Valette; [2021]
   Keywords : land plants; geobiological impacts; extinction; Palaeozoic; paleobotany; landväxter; geobiologiska effekter; utrotning; Paleozoikum; paleobotanik;

   Abstract : For two centuries, questions about the origin of terrestrial plants and their impacts on the Earth systemhave occupied palaeobotanists. This essay attempts to synthesise the state of research to date, and outlineareas where major questions remain. READ MORE

5. 9. Estimating the Early Evolution of Brachiopods Using an Integrated Approach Combining Genomics and Fossils

   University essay from Uppsala universitet/Paleobiologi

   Author : Chloé Robert; [2019]
   Keywords : Brachiopoda; evolutionary history; phylogeny; Maximum likelihood; Bayesian inference; fossil calibrations; Brachiopoda; evolutionhistoria; fylogeni; Maximum likelihood-metoden; Bayesiansk statistik; fossilkalibering;

   Abstract : The Brachiopoda, a major group of the Lophotrochozoa, experienced a rapid early evolutionary diversification during the well-known Cambrian explosion and subsequently dominated the Palaeozoic benthos with its diversity and abundance. Even though the phylogeny of the Lophotrochozoa is still hotly debated, it is now known that the Brachiopoda are a monophyletic grouping. READ MORE

6. 10. Cell Size Variation in Fossil Coccolithophores (Haptophyta) : A Study of Pliocene Sediments from Northwestern Australia

   University essay from Uppsala universitet/Institutionen för geovetenskaper

   Author : Nicole Eliassen; [2018]
   Keywords : Coccolithophore; cell; carbon cycle; Australia; palaeobiology; climate change.; Fästalger Haptophyta ; kokkolitoforider; Pliocen; cell; kolcykel; Australien; paleobiologi; klimatförändring;

   Abstract : This report examines the size variations of fossil carbonate-producing haptophyte microalgae, coccolithophores, using sediments deposited during the Pliocene. The sediments were collected by the International Ocean Discovery Program (IODP) in 2015, off the coast of NW Australia (Gallagher et al., 2017). READ MORE