Browsing Biologisk institutt by Issue Date
Now showing items 21-40 of 118
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(Master thesis / Masteroppgave, 2008)Alzheimers sykdom, Parkinsons sykdom og hjerneslag er assosiert med nevrodegenerering i visse deler av hjernen. Overstimulering av glutamatreseptorer med medfølgende produksjon av frie radikaler har blitt foreslått å være ...
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(Master thesis / Masteroppgave, 2008)Marine trepigget stingsild (Gasterosteus aculeatus) har kolonisert ulike ferskvannshabitat gjentatte ganger og denne koloniseringen har ført til ulikheter innen trekk som morfologi, atferd, fysiologi og livshistorie. Disse ...
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(Doctoral thesis / Doktoravhandling, 2008)Imagine if salmon snared on a hook or fish caught in a net were to scream and shout when they were extracted from the water. What would sports fishing and professional fishing have been like then? Would fish farming have ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2008)Background Cyanobacteria produce a wealth of secondary metabolites, including the group of small cyclic heptapeptide hepatotoxins that constitutes the microcystin family. The enzyme complex that directs the ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2008)Background Despite several thousands of years of close contacts, there are genetic differences between the neighbouring countries of Finland and Sweden. Within Finland, signs of an east-west duality have ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2008)Background Cyanopeptolins are nonribosomally produced heptapetides showing a highly variable composition. The cyanopeptolin synthetase operon has previously been investigated in three strains from the genera ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2008)Background Identification of DNA sequence diversity is a powerful means for assessing the species present in environmental samples. The most common molecular strategies for estimating taxonomic composition ...
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(Doctoral thesis / Doktoravhandling, 2008)Cyanobakterier (=blågrønnalger) forekommer i nesten alle norske innsjøer, og masseoppblomstringer av dem har vist seg å være utbredt over hele verden. Et stort problem ved oppblomstringer av cyanobakterier er giftstoffene ...
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(Doctoral thesis / Doktoravhandling, 2008)In this thesis I report on several aspects of the reproductive ecology of the short-lived, monocarpic plant Digitalis purpurea L. (Plantaginaceae). Observational field studies are combined with controlled crosses and ...
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(Doctoral thesis / Doktoravhandling, 2008)In most cases, the proliferation of marine planktonic alga is ecologically beneficial for the marine food web. However, harmful algal blooms can have negative effects by causing fish kills. In this PhD thesis particularly ...
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(Doctoral thesis / Doktoravhandling, 2008)I dette arbeidet har vi utviklet molekylære metoder for simultant å måle forekomsten av ulike mikrober i komplekse samfunn. Koblet med økologisk analyse gir dette oss helt nye muligheter til å forstå hvordan bakteriesamfunn ...
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(Doctoral thesis / Doktoravhandling, 2008)This thesis investigates competition and ecological speciation by comparing habitat use, foraging ecology and physiology of two fish populations (Coregonus spp.) in a temperate lake. It demonstrates that dietary differences ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2009)Background: Large multigene sequence alignments have over recent years been increasingly employed for phylogenomic reconstruction of the eukaryote tree of life. Such supermatrices of sequence data are preferred over single ...
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(Doctoral thesis / Doktoravhandling, 2009)Denne avhandlingen viser at fisk utsatt for lave nivåer av produsertvann over lang tid kan utvikle skader på arvematerialet, modnes senere og få redusert vekst. Produsertvann er et biprodukt fra utvinningen av olje og ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2009)Climate change and overfishing are increasingly causing unanticipated changes in marine ecosystems (e.g. shifts in species dominance). In order to understand and anticipate these changes, there is a crucial need for ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2009)Background Cyanobacteria often produce several different oligopeptides, with unknown biological functions, by nonribosomal peptide synthetases (NRPS). Although some cyanobacterial NRPS gene cluster types ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2009)Background To conduct phylogeographic or population genetic studies, an adequate number of DNA markers for the focal species are required. Due to severe unavailability of genotype markers of any kind for ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2009)Background Although some mechanisms of habitat adaptation of conspecific populations have been recently elucidated, the evolution of female preference has rarely been addressed as a force driving habitat ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2009)Background Genetic variation has been shown to play a significant role in determining susceptibility to the salmon louse, Lepeophtheirus salmonis. However, the mechanisms involved in differential response ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2009)Background In order to understand the role of herbivores in trophic webs, it is essential to know what they feed on. Diet analysis is, however, a challenge in many small herbivores with a secretive life ...