Search for dissertations about: "Preference evolution"

Showing result 1 - 5 of 49 swedish dissertations containing the words Preference evolution.

  2. 1. Evolutionary and mechanistic aspects of insect host plant preference

    Author : Alexander Schäpers; Niklas Janz; Steven Heard; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; host plant choice; host range; diet breadth; butterfly; oviposition; specialist; generalist; insect-plant interaction; search behavior; olfaction; decision making; evolution; parasite-host interaction; zoologisk ekologi; Animal Ecology;

    Abstract : Plant feeding insects comprise about 25% of all animal species on earth and play an important role in all ecosystems. Although we understand that their association with plants is a key-factor driving the diversification in this group, we still have large gaps in our knowledge of the underlying processes of this relationship. READ MORE

  4. 2. Sculpted through Time : Evolution and Function of Serine Proteases from the Mast Cell Chymase Locus

    Author : Maike Gallwitz; Lars Hellman; Lars Pilström; Urban Gullberg; Uppsala universitet; []
    Keywords : Immunology; immune system; mast cell; chymase locus; serine protease; evolution; gene duplication; Immunologi;

    Abstract : Immune cells like NK cells, T cells, neutrophils and mast cells store high amounts of granule serine proteases, graspases. Graspases are encoded from the mast cell chymase locus. The human locus holds four genes: α-chymase, cathepsin G, and granzymes H and B. In contrast, the mouse locus contains at least 14 genes. READ MORE

  5. 3. Insights into the Evolution of Moth Pheromone Communication: Lessons from the European Corn Borer

    Author : Jean-Marc Lassance; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; biosynthetic enzymes; evolution; Ostrinia nubilalis; mate choice; mate finding; olfaction; biosynthesis; speciation; moth; pheromone; olfactory receptors.;

    Abstract : Chemical communication by means of sex pheromones is central to the mating systems of a wide range of organisms. Because reproductive isolation is often based on pheromone differences, understanding how pheromones diverge is necessary for a complete comprehension of the speciation process. READ MORE

  6. 4. Evolution of signal form

    Author : Liselotte Jansson; Magnus Enquist; Gunilla Rosenqvist; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biology; Biologi;

    Abstract : Visual signals, used for communication both within and between species, vary immensely in the forms that they take. How is it that all this splendour has evolved in nature? Since it is the receiver’s preferences that cause selective pressures on signals, elucidating the mechanism behind the response of the signal receiver is vital to gain a closer understanding of the evolutionary process. READ MORE

  7. 5. A Genetic Switch in Bacteriophages within the Peduovirinae Subfamily : Structure, Function and Evolution

    Author : Hanna Nilsson; Anders Nilsson; Öjar Melefors; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; molekylärgenetik; Molecular Genetics;

    Abstract : The temperate bacteriophages in the Peduovirinae subfamily can either grow lytically or integrate into their bacterial host and form lysogeny. Which one of the two life cycles the phage will enter after infection is controlled by a transcriptional switch. READ MORE