Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2010
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Knut Rydgren Jørn-Frode Nordbakken Ingvild Austad Inger Auestad Einar HeegaardSammendrag
Semi-natural grasslands and their species and populations are declining rapidly throughout Europe, bringing about a need for successful vegetation recreation methods. To maintain biodiversity and ecological services of semi-natural grasslands, we need more knowledge on the relative performance of different recreation methods. In a replicated experiment in western Norway, we evaluated two hay transfer methods (hard or light raking of local hay), sowing of local seeds and natural regeneration for recreating semi-natural grassland in a road verge. We compared treated trial plots with their respective donor plots (where hay and seeds were harvested) for three successive years by evaluating vegetation cover, species richness and species transfer rates, and vegetation dynamics analysed by Bray-Curtis compositional dissimilarity (BC) and GNMDS (Global Non-Metric Multidimensional Scaling) ordination. Vegetation cover at the trial site exceeded that of donor sites in three years. Transfer rates of common species were high for seed sowing and both hay transfer procedures. Species composition in trial plots for all three treatments became significantly more similar to donor plots, but was still relatively dissimilar after three years. Natural regeneration showed a different temporal pattern and also had a higher successional rate. The species composition of the other treatments followed the same trajectory toward the donor sites as revealed by GNMDS. We found relatively small differences between the two hay transfer methods and seed sowing. Transfer of local hay therefore appears to be a successful method of establishing local species when recreating semi-natural grasslands, and is generally cheaper than using commercial local seed mixtures.
Forfattere
Bent Håvard Hellum Anita Tøsse Kathrine Høybakk Mette Thomsen Jens Rohloff Odd Georg NilsenSammendrag
Six clones of Rhodiola rosea, obtained from plants originating from widely different areas in Norway, were investigated for their in vitro inhibitory potential on CYP3A4-mediated metabolism and P-gp efflux transport activity. Presumed active constituents in the ethanol extracts of the different clones were quantified. C-DNA baculovirus expressed CYP3A4 and Caco-2 cells were used for inhibitory assays, and as positive control inhibitors ketoconazole and verapamilwere applied, respectively. A validated HPLC methodology was used to quantify the formation of 6-β-OH-testosterone and scintillation counting was used to quantify the transport of 3H-digoxin in Caco-2 cells. All clones showed potent inhibition of CYP3A4 and P-gp activities, with IC50 values ranging from 1.7 to 3.1 μg/mL and from 16.7 to 51.7 μg/ mL, respectively, being below that reported for other herbs and some known classic drug inhibitors, such as St. John’s wort and fluoxetine. Rhodiola rosea might thus be a candidate for clinically relevant drug interactions. The concentration of presumed biologically active constituents in the different clones varied considerably, but this variationwas not related to the clones’ inhibitory potential on CYP3A4 or P-gp activities. Other constituents might thus be responsible for the observed inhibitory properties. The place of origin seemed to be of minor importance for CYP3A4 or P-gp inhibition.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Vegar Bakkestuen Per Arild Aarrestad Odd E. Stabbetorp Lars Erikstad Odd EilertsenSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Arne GrønlundSammendrag
Det er ikke registrert sammendrag
Forfattere
Nina BrøggerSammendrag
Det er ikke registrert sammendrag
Forfattere
Arnt Kristian GjertsenSammendrag
I november 2009 lanserte Skog og landskap SAT-SKOG på Internett. SAT-SKOG er et skogkart som gir oversikt over skogressursene og viser informasjon om treslag, alder og volum på et overordnet nivå. I følge vår statistikk ble nyheten om SAT-SKOG den mest leste nyheten på våre internettsider i 2009. Produktet er basert på tolking av skog fra satellittbilder.
Sammendrag
Vi har sju norske storferaser og seks av disse har så små populasjoner at de regnes som truet. Norsk genressurssenter har det siste året tatt et krafttak for å få et fullstendig manntall over disse seks rasene ved å oppgradere slektskapsdatabasen Kuregisteret i samarbeid med Geomatikkseksjonen ved Skog og landskap. Men hva er egentlig en norsk storferase?