Sökning: "Ryggradsdjur"
Visar resultat 1 - 5 av 30 avhandlingar innehållade ordet Ryggradsdjur.
1. A systematic revision of the Neotropical catfish genus Rhamdia (Teleostei, Pimelodidae)
Sammanfattning : .... LÄS MER
2. Diversity and Limits of Colour Vision in Terrestrial Vertebrates
Sammanfattning : Most terrestrial vertebrates have colour vision, some perceive a less colourful world and others actually discriminate a wider colour spectrum than humans do. Still, we can all make use of the valuable colour information, which is more rigid than just brightness. LÄS MER
3. Evolution of Vertebrate Eyes: a study on lens suspension and optical proterties
Sammanfattning : Many fishes have well-developed visual systems with color vision capabilities. The crystalline lens is the major refractive element in a fish eye since the cornea is optically inactive underwater. A typical fish eye has a large pupil and a lens of short focal length, features that increase light gathering ability. LÄS MER
4. The ubiquity and type diversity of papillomaviruses in normal skin
Sammanfattning : Papillomaviruses are a diverse, epitheliotropic group of viruses. Some genotypes are the main cause of anogenital cancer in humans; others can induce skin lesions. In order to investigate the occurrence of subclinical skin infections with human papillomavirus (HPV), a pair of degenerate primers (FAP59/64) was designed. LÄS MER
5. The optic tectum of the salmon:site of interaction of neurohormonal photoperiodic and neural visual signals. The GABAergic neuronal system and melatonin receptors
Sammanfattning : Melatonin is a neurohormone which mediates photoperiodic signals from the pineal organ to the brain. GABA (g-aminobutyric acid) is the major inhibitory transmitter in the central nervous system. LÄS MER