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.
2012
Forfattere
Karen Refsgaard Ingrid GuldvikSammendrag
Det er ikke registrert sammendrag
Forfattere
Sheng-Hong Li Nina Elisabeth Nagy Almuth Hammerbacher Paal Krokene Xue-Mei Niu Jonathan Gershenzon Bernd SchneiderSammendrag
Norway spruce (Picea abies) bark contains specialized phloem parenchyma cells that swell and change their contents upon attack by the bark beetle Ips typographus and its microbial associate, the blue stain fungus Ceratocystis polonica. These cells exhibit bright autofluorescence after treatment with standard aldehyde fixatives, and so have been postulated to contain phenolic compounds. Laser microdissection of spruce bark sections combined with cryogenic NMR spectroscopy demonstrated significantly higher concentrations of the stilbene glucoside astringin in phloem parenchyma cells than in adjacent sieve cells. After infection by C. polonica, the flavonoid (+)-catechin also appeared in phloem parenchyma cells and there was a decrease in astringin content compared to cells from uninfected trees. Analysis of whole-bark extracts confirmed the results obtained from the cell extracts and revealed a significant increase in dimeric stilbene glucosides, both astringin and isorhapontin derivatives (piceasides A to H), in fungus-infected versus uninfected bark that might explain the reduction in stilbene monomers. Phloem parenchyma cells thus appear to be a principal site of phenolic accumulation in spruce bark.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Lone Ross Gobakken Mats WestinSammendrag
Environmentally sound wooden facades with long service lives and acceptable appearance are desired. Several types of modified wood are used in building applications to fulfil those requirements, but there is a potential for using more modified wood material. In facades modified wood are often used without any surface treatment or coating, but some sort of coating are desired and requested in a segment of the potential marked. Finding suitable coating systems for modified wood can be a challenge, and the objective of this study was to evaluate the long time performance of modified wood substrates in combinations with different coating systems after 8 years of outdoors exposure. Furthermore, evaluations at 4 and 8 years were compared to study the quantitative mould growth in a very late stage of the test period to capture any deviant behaviour from the traditional growth curve. Three coating systems were applied on furfurylated Scots pine, acetylated Scots pine, thermally modified Scots pine, oil/thermally modified Scots pine, thermally modified Norway spruce, and three reference wood substrates, and exposed outdoors for 8 years to evaluate their ability to resist surface moulds and blue stain fungi, cracking and flaking. The test was carried out according to EN 927-3. After 8 years mould growth, cracking and flaking mainly varied with type of coating where the tendency was that a waterborne system had the lowest rating for both mould growth, cracking and flaking. Oil/thermally modified treated pine had the lowest mould rating of the modified substrates. Acetylated pine had a decrease in mould rating from year 4 to year 8 when coated with the best coating system and a very small increase when coated with the second best system. Acetylated pine tended to have less flaking than the other modified substrates. Furthermore, acetylated pine, thermally modified pine and thermally modified spruce tended to have the least cracking of the modified wood substrates.
Forfattere
Christer MagnussonSammendrag
Det er ikke registrert sammendrag
Forfattere
Christer MagnussonSammendrag
Det er ikke registrert sammendrag
Forfattere
Christer MagnussonSammendrag
Det er ikke registrert sammendrag
Forfattere
Even Sannes Riiser Ingrid Holtsmark Hege Særvold Steen S. Swaminathan N Khanna Ralph Bock jihong liu clarkeSammendrag
The global spread of dengue fever threatens a large percentage of the world’s population. The disease causes great human suffering, a high mortality from dengue haemorrhagic fever and its complications, and major costs. There is currently no vaccine to prevent dengue virus infection. Our project aims to express a tetravalent vaccine candidate in tobacco chloroplasts, a cost effective system, and hence to contribute to innovation and bio-economy as a long term goal.
Forfattere
Even Riiser Ingrid Holtsmark Hege Særvold Steen S. Swaminathan Navin Khanna Ralph Bock Jihong Liu ClarkeSammendrag
Det er ikke registrert sammendrag
Forfattere
Even Riiser Ingrid Holtsmark Hege Særvold Steen S. Swaminathan Navin Khanna Ralph Bock Jihong Liu ClarkeSammendrag
The global spread of dengue fever threatens a large percentage of the world’s population. The disease causes great human suffering, a high mortality from dengue haemorrhagic fever and its complications, and major costs. There is currently no vaccine to prevent dengue virus infection. Our project aims to express a tetravalent vaccine candidate in tobacco chloroplasts, a cost effective system, and hence to contribute to innovation and bio-economy as a long term goal.