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
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Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Store drensvannvannprøver (5-15 l) ble tatt ut før og etter passering av et leca (Filtralite-P) filter og sedimentet ble oppkonsentrert før det ble tørket og sendt til tynnslippreparering. Mikroskopstudier av disse sedimentene fra drensvann tatt ut før og etter passering av lecafilter viser at filteret holder tilbake partikler større enn leirfraksjonen, mens finfordelt leir har fulgt drensvannet gjennom filteret. Andelen av leir var for alle tidspunkter høyest i utprøven og prøver tatt av filtermaterialet viser at det er avsatt orientert leir på og mellom lecakulene. Vannprøver tatt ut ved utløp av filteret klarner raskere enn vann tatt ut ved innløpet når det står til sedimentasjon, noe som trolig kommer av en homogenisering av partikkelstørrelsen og en økning av innholdet av ioner i vannet etter at det har passert filteret.
Forfattere
Mari Mette Tollefsrud Christian Brochmann Christoph SperisenSammendrag
Norway spruce (Picea abies L. Karst) and Siberian spruce (Picea obovata Lebed.) are closely related and occupy a large parapatric area across the entire northern Eurasia. They have been suggested to be connected by a wide zone of hybridization along the Ural Mountains, separating the European Norway spruce from the Siberian spruce. This introgressive zone is believed to be formed by secondary contact after the last glaciation. Based on macrofossils, P. obovata has been suggested to have survived the LGM in refugia both on the eastern and the western side of the Urals. Previous genetic isozyme studies have indicated that the two spruce taxa are genetically poorly differentiated.
Sammendrag
The blue-stain fungus Ceratocystis resinifera colonizes wounds on living Picea spp. and other conifers in Europe and North America. Little is known regarding the pathogenicity of this fungus and consequently, four Norwegian C. resinifera isolates were inoculated on to Norway spruce (Picea abies) using two different techniques. These included single-point inoculations on young trees (two inoculations per tree on 14-year-old trees) and mass-inoculations on older trees (∼200 inoculations per tree on 34-year-old trees). In both experiments, C. resinifera induced minor symptoms that in most cases did not differ significantly from inoculation with sterile agar. The virulent blue-stain fungus C. polonica, which was inoculated for comparative purposes, induced extensive symptoms, causing 83% dead cambium circumference and 82% blue-stained sapwood, and long necrotic lesions in the phloem. The results suggest that C. resinifera is non-pathogenic or only mildly pathogenic to Norway spruce and does not present a threat to these trees.
Forfattere
Arne Hermansen Grete Lund Elisa Gauslå Abdelhameed Elameen Ragnhild Nærstad Sonja KlemsdalSammendrag
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Forfattere
Arne HermansenSammendrag
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Forfattere
Dag-Ragnar BlystadSammendrag
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Forfattere
Dag-Ragnar Blystad S. L. Nielsen A. O. Alfaro-Fernandéz Gábor Bese Dimitrinka Hristova Henryk Pospieszny Maja Ravnikar Maryjean Schenk Laura Tomassoli Christina Varveri Kari Ørstad Carl Jonas Jorge Spetz René van der VlugtSammendrag
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Forfattere
Håvard Steinshamn Mats Höglind Øystein Havrevoll Kristin Saarem Inger-Helene Lombnæs Geir Steinheim Asgeir SvendsenSammendrag
The purpose of this study was to compare the effect of grazing on mountain (M) versus cultivated lowland pasture (C) on the performance and meat quality of suckling calves (Experiments 1 and 2). In addition, the effect of finishing on C after M on growth and meat quality was assessed (Experiment 2). Animals on C and M had on average similar live weight gain and carcass weight in the first experiment. However, the performance depended on year as gain and carcass weight was higher on C than on M in the first year and vice versa in the second year. In the second experiment the calves on M had lower gain and carcass weight than on C. Three weeks finishing on C after M compensated to some extent for the lower growth rate on M. Overall, the results indicate that mountain grazing may yield similar growth rates and slaughter weights as improved lowland pasture depending on year. There were only small effects of pasture type on carcass and meat quality traits like conformation, fatness, intramuscular fat and protein content, and fatty acid (FA) composition. The variation in FA composition could to a large extent be explained by difference in fatness with increase in monounsaturated and decrease in polyunsaturated FA with increasing intramuscular fat content, in turn varying between pasture type, experiment and year. There was a tendency that M led to higher proportion of C18:1n-9 and lower proportion of C18:1n-7 than C. which may be due to difference in milk and forage intake. Both pasture types resulted in meat with intramuscular fat with high nutritional value since the n-6/n-3 ratio was low. (C) 2010 Elsevier B.V. All rights reserved.