Sökning: "Funktionell zoologi"

Visar resultat 11 - 15 av 49 avhandlingar innehållade orden Funktionell zoologi.

  1. 11. Spatial Vision in Birds: Anatomical investigation of spatial resolving power

    Författare :Mindaugas Mitkus; Funktionell zoologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Raptors; Seabirds; Parrots; Birds; Double cones; Development; Retinal ganglion cells; Visual spatial resolution; Visual ecology; Vision;

    Sammanfattning : Avian eyes are big both in relative and absolute terms, thus the importance of vision to birds is obvious. Even though the general eye plan is rather conservative throughout the group, there is a great variation in visual capabilities. LÄS MER

  3. 12. Magnetic orientation in migratory birds

    Författare :Rachel Muheim; Funktionell zoologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Animal ecology; Djurekologi; cue-conflict; clock-shift; cue calibration; geomagnetic field; high Arctic latitudes; Emlen funnel; magnetic compass; magnetoreception; navigation; migration; bird; orientation;

    Sammanfattning : My thesis focuses on magnetic orientation in migratory birds, i.e. how they can perceive information from the Earth’s magnetic field and use it for orientation. LÄS MER

  4. 13. The role of the MAP- and SAP- kinase pathways in the survival, proliferation and death of Schwann cells of the injured sciatic nerve

    Författare :Lisa Mårtensson; Funktionell zoologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis concerns alterations in signal transduction in Schwann cells as a response to nerve injury as well as their survival, proliferation and death. Enzymes and transcription factors belonging to the mitogen activated protein kinase (MAPK) and the stress activated protein kinase (SAPK) pathways were studied. LÄS MER

  5. 14. Visually guided swimming in box jellyfish: A study of swimming behaviour in response to visual stimuli

    Författare :Ronald Petie; Funktionell zoologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Vision; steering; swimming; behaviour; box jellyfish; Cubozoa; Tripedalia cystophora; biomechanics;

    Sammanfattning : Most animals use eyes to guide their behaviour. Analysing, and understanding, visually guided behaviours gets more complicated the more advanced the animal gets. Box jellyfish provide a relatively simple system for understanding visually guided behaviours. LÄS MER

  7. 15. Movements in the dark : flying, landing and walking in insects

    Författare :THERESE REBER; Funktionell zoologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; insect; vision; light intensity; bumblebee; retina; behavioural adaptation; flight; landing; dung beetle; nocturnal adaptation; sky compass; straight-line orientation;

    Sammanfattning : Flying, as well as walking insects rely on vision to regulate locomotion, even in the dark when the visual system is much less reliable. To manage visual control of these behaviours at low light intensities, many insects have evolved optical adaptations, such as larger facet lenses and wider rhabdoms, and neural adaptations, such as spatial and temporal summation, to increase their visual sensitivity. LÄS MER