Sökning: "fiskar"
Visar resultat 11 - 15 av 54 avhandlingar innehållade ordet fiskar.
11. Afhandling om de amphibier och fiskar, som i Bibelen omtalas. Första delen. Med Medicinska Facultetens gunstiga tilstånd under ... C. P. Thunbergs inseende utgifven af Erik Henrik Eriksson af Östgötha landskap ... och til granskning framstäld uti Botan. lectionssalen d. 14 nov. 1827
Sammanfattning : .... LÄS MER
12. MULTIFOCAL SPHERICAL FISH LENSES
Sammanfattning : Vision is an important source of information for many animals. The lens plays a central role in the visual pathway and hence the ecology of these animals. Fish have spherically shaped crystalline lenses that contain a gradient of refractive index. Like all refracting elements, lens performance depends on the wavelength of the refracted light. LÄS MER
13. The dynamics in harvested populations
Sammanfattning : We are interested in the effect of harvesting on population fluctuations and for that purpose we develop and analyze an age-structured model where recruitment is a stochastic process and the adult segment of the population is harvested. When a constant annual harvest is taken the coefficient of variation of the adult population increases for most parameter values due to the age truncation effect, i. LÄS MER
14. Infectious Pancreatic Necrosis Virus (IPNV) - Structural Studies and Methodology
Sammanfattning : Infectious pancreatic necrosis virus (IPNV) is a Birnavirus that infects salmonid fish. The infection is usually mortal for fish under six months of age, while older fish become carriers, usually without any signs of infection, and will spread the virus to other susceptible fish and to their offspring. LÄS MER
15. Basal Vertebrate Divergences from a Molecular Perspective
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