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.
2009
Forfattere
jihong liu clarkeSammendrag
The application of genetic engineering in the floriculture industry has become instrumental and rewarding in meeting the demand for novel desirable traits. Agrobacterium-mediated transformation for poinsettia (Euphorbia pulcherrima Willd. Ex Klotzsch), a contemporary symbol of Christmas in most parts of the world, is reported here for the first time. Internode stem explants of poinsettia cv. Millenium were transformed by Agrobacterium tumefaciens, strain LBA 4404, harbouring hairpin (hp) RNA gene constructs to induce RNA silencing-mediated resistance to Poinsettia mosaic virus (PnMV). In five experiments utilizing 868 explants, 18 independent transgenic lines were generated. Stable integration of transgenes into the poinsettia nuclear genome was confirmed by PCR and Southern blot analysis. Both single- and multiple-copy transgene integration into the poinsettia genome were found among transformants. Transgenic poinsettia plants showing resistance to mechanical inoculation of PnMV were detected by double antibody sandwich enzyme-linked immunosorbent assays. Northern blot analysis of low molecular weight RNA revealed that transgene-derived small interfering (si) RNA molecules were detected among the poinsettia transformants prior to inoculation. The Agrobacterium-mediated transformation methodology developed in the current study should facilitate improvement of this ornamental plant with enhanced disease resistance, quality improvement and desirable colour alteration. Production of yellow-coloured poinsettia using the Agrobacterium-mediated transformation method is in progress.
Forfattere
Mona RingnesSammendrag
Det er ikke registrert sammendrag
Forfattere
Mona RingnesSammendrag
Det er ikke registrert sammendrag
Sammendrag
This paper reports a study on soil development in loamy marine sediments on both sides of the Oslofjord (Vestfold, Ostfold). This region has been subject to steady glacio-isostatic uplift during the whole Holocene. Hence, land surface age continuously increases from the coast inland. Several sea level curves, based on radiocarbon datings, enable estimation of land surface age for all locations. Clay illuviation starts in less than 1650 years. E horizons become lighter with age, but their lower boundary stays around 40 cm for more than 10 000 years. Albeluvic tongues develop between 4600 and 6200 years. Initially, they form along intersections of cracks. As preferential flow and leaching along the cracks continues, the tongues increase in length and width, progressively consuming the prisms between the cracks in the upper Bt horizon. The Fe-d/Fe-t ratios (weighted means of the upper meter) show a clear linear increase with soil age and may be used for "pedo-dating", i.e. for estimating the ages of non-dated land surfaces covered with similar sediments. In contrast, the logarithmic decrease of base saturation and pH, with rapid changes in the first time but only very slight changes between 2000 and 10 000 years, makes these parameters unsuitable for "pedo-dating". (c) 2008 Elsevier Ltd and INQUA. All rights reserved.
Forfattere
Rastislav Solár Miroslav Mamo Janka Dibdiakova Jarmila GeffertováSammendrag
A series of comparable specimens of spruce wood were submitted to chemical pre-treatments. Chemical pre-treatments were carried out with diluted sodium hydroxide, or sodium hydroxide and then by hydrogen peroxide, or per-acetic acid. All pre-treatments modified the chemical composition of wood and led to its weight loss. The pre-treatments resulted in a complete deacetylation, and partial delignification of wood and did not cause apparent loss of cellulose. Chemical alterations of the pre-treated spruce wood were markedly reflected in its improved digestibility under conditions of kraft cook. The obtained pulps were characterized with apparently reduced content of residual lignin, lower yield, moderate drop in DP, higher brightness and better optical properties (colour and lightness) of both unbleached and bleached pulps.
Forfattere
Bjørn FrantzenSammendrag
Artikkel om fuglelivet i det nordlige Barentshav med Svalbard.
Forfattere
Eva Birken Mekjell MelandSammendrag
This paper describes briefly the phenomena of alternate bearing of European plums and point out that more detailed investigations about physiological factors, in particular plant hormones, involved in the flowering process are of great importance.
Sammendrag
Dersom økologisk førsteårenga av timotei eller engsvingel skal utnyttes til grønngjødsling eller fôrproduksjon, bør vi nøye oss med to slåtter/avpussinger med siste slått/avpussing i begynnelsen av august. I middel for forsøka med timotei førte to avpussinger til 24% meravling i andre engår og 11% meravling i tredje engår, sammenlikna med om førsteårenga ble treska som frøeng. Ved to fôrslåtter var tilsvarende meravlinger 18% i første engår og 3% i andre engår. Om lag samme forhold gjaldt for engsvingel. Ulempen med å utnytte førsteårseng til grønngjødsling eller fôrproduksjon er at dette kan føre til mer kvitkløver åra etter. Dette problemet er likevel mindre ved to avpussinger som grønngjødsling enn ved andre utnyttelsesystemer. Ved siste avpussing eller slått i begynnelsen av august vil enga fortsette å vokse ut over høsten og gå vinteren i møte med mye bladmasse. Denne bladmassen gjør ingen skade i timotei, men i engsvingel bør den fjernes ved brenning eller avpussing før vekststart om våren i andre engår.
Sammendrag
One of the biggest drawbacks of using European native wood species as a construction material is its tendency to degrade by fungal attack. This has lead to the development of different systems for wood preservation. Many of these systems suffer the disadvantage that they contain biocides, which can leach from the wood into the environment and damage organisms. In this project ten silanes, 3-(2-Aminoethylamino)propyltrimethoxysilane, 3-[2-(2- aminoethylamino)ethylamino]propyltrimethoxysilane, 3-Aminopropyltrimethoxysilane, Diethoxydimethylsilane, Dodecyltriethoxysilane, Hexadecyltrimethoxysilane, NTrimethoxysilylpropyl- N,N,N-trimethylammoniumchloride, Octyltriethoxysilane, Octyltrimethoxysilane and Phenyltrimethoxysilane, have been investigated for their ability to increase the hydrophobicity of wood and decrease shrinking and swelling, and thus increase its ability to withstand attack by fungi. In the initial phase of the project two solvents, ethanol and water were investigated to find out which of these that gave the best result for surface modification with silanes. The results showed that water as solvent gave a surface with higher hydrofobicity than when ethanol was used as solvent....
Forfattere
Mauritz ÅssveenSammendrag
Det er ikke registrert sammendrag