Sökning: "Agnatha"

Hittade 3 avhandlingar innehållade ordet Agnatha.

1. 1. Evolution of Vertebrate Eyes: a study on lens suspension and optical proterties

   Författare :Ola Gustafsson; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; evolution; eye; fish; crystalline lens; lens suspension; multifocal optical systems; Agnatha; Actinopterygii; Chondrichthyes; Vertebrate; Sarcopterygii;

   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

3. 2. Basal Vertebrate Divergences from a Molecular Perspective

   Författare :Ann-Sofie Rasmussen; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mitochondrial genomes; Agnatha; Chondrichthyes; vertebrates; evolution; systematics; Genetics; cytogenetics; Genetik; cytogenetik;

   Sammanfattning : Fishes (Superclass Pisces) constitute the most numerous and morphologically diverse vertebrate group, yet only a small fraction of all molecular evolutionary studies concern piscine evolution. This thesis aims to investigate the vertebrate tree, through the analysis of mitochondrial (mt) DNA sequences. LÄS MER

4. 3. Die Hämoglobine von Myxine glutinosa L. (Cyklostomata) : Primärstruktur des monomeren Hämoglobins III und Untersuchung von Funktion und Evolution

   Författare :Gisela Liljeqvist; Stockholms universitet; []
   Nyckelord :;

   Sammanfattning : Studies on the hemoproteins of the hagfish Myxine glutinosa L. (Cyclostomata) are of great interest with respect to the evolution of vertebrate hemoglobins.Hagfish hemoglobin is heterogeneous. Three main components, Hb I, Hb II and Hb III, as well as ten minor ones, have been isolated by isoelectric focusing. LÄS MER