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Visar resultat 1 - 5 av 7 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Preservation of Marine Reptile Soft Parts: Reconstructing the Life and Death of Ancient Leviathans

    Författare :Randolph De La Garza; Berggrundsgeologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Molecular paleontology; Taphonomy; Soft-tissues; Lagerstätten; Skin; Sea Turtle; Ichthyosaur; Fur Formation; Posidonia Shale; Paleobiology; Marine Reptiles;

    Sammanfattning : Marine reptiles constitute a diverse group of secondarily aquatic tetrapods that have inhabited the world’s oceans for the greater part of the last 250 million years. While certain large-scale anatomical changes have been observed through progressive alterations of their skeletal morphology (e.g. LÄS MER

  3. 2. Human salmonellosis : impact of travel and trade from a Swedish perspective

    Författare :Birgitta De Jong Skierus; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Salmonella; salmonellosis; reptile-associated salmonellosis; travel-associated salmonellosis; S. Enteritidis; European salmonella incidence; serotype; serovar; sewage treatment plants; antibiotic resistant; pre-travel advice.;

    Sammanfattning : Background: Salmonellosis is one of the most important gastrointestinal infections in humans. The vast majority of Swedish Salmonella cases have acquired the disease abroad, reflecting both a large number of Swedish travellers and a very favourable domestic Salmonella situation compared to other countries, mainly due to various control programs implemented in the animal food production and import regulations (e. LÄS MER

  4. 3. Nesting ecology of the grass snake (Natrix natrix) and its implications for conservation

    Författare :Kristin Löwenborg Di Marino; Mattias Hagman; Sören Nylin; Tobias Uller; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; agriculture; anthropogenic; climate; embryonic development; incubation; zoologisk ekologi; Animal Ecology;

    Sammanfattning : The onset of agriculture about 12,000 years ago has had a major influence on the biodiversity of plants and animals. Unfortunately, the rapid changes in agricultural practices that has occurred in recent times has negatively affected many farmland species. LÄS MER

  5. 4. On the Nature of Cemented Carbide Wear in Rock Drilling

    Författare :Ulrik Beste; Staffan Jacobson; Mikael Olsson; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; cemented carbide; wear; rock drilling; rock; Materialvetenskap; Materials science; Teknisk materialvetenskap;

    Sammanfattning : WC/Co cemented carbide is a composite material for highly demanding wear applications. The unique combination of hardness (from the WC-phase) and toughness (from the binder Co) gives a material especially suitable for rock drilling. LÄS MER

  7. 5. Origin, evolution and biodiversity of the Neotropical herpetofauna: patterns and processes of the world’s richest and most threatened biota

    Författare :Josué Azevedo; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Amazonia; biodiversity indices; Cerrado; integrative taxonomy; phylogenetic endemism; phylogenetic turnover;

    Sammanfattning : The biological diversity of tropical America (the Neotropics) is astonishing. However, even among terrestrial vertebrates, most biogeographical patterns are not fully described nor understood, especially for many Neotropical reptiles and amphibians (the herpetofauna). LÄS MER