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.
2006
Forfattere
Liv OstremSammendrag
Resultat frå 2. engåret på fem felt i Rogaland / Agder viser svært god overvintring i Hykor medan Felopa varierer mykje meir. Tidleg skyting krev at spesielt Hykor må haustast tidleg.
Forfattere
Anders Yri Jens KøhlerSammendrag
Det er ikke registrert sammendrag
Forfattere
Erlend Ystrøm Haartveit Per Otto FlæteSammendrag
The optimal utilisation of a wood raw material is dependent on the wood properties. In this study near infrared (NIR) spectroscopy was used to non-destructively predict density, modulus of elasticity, and modulus of rupture for small clear specimens cut from Picea abies (L.) H. Karst. (Norway spruce) trees.NIR spectra were recorded directly on the wood surface of each specimen as close as possible to the fracture developed during the bending test. Models were calibrated using partial least squares regression. The validation method was test set validation by data splitting.The correlation between predicted and measured values was highest for modulus of elasticity (0.86), followed by modulus of rupture (0.84) and density (0.79). The validation of the models showed that the average accuracies of predictions were 20.3 kg/m3 for density, 1.1 GPa for modulus of elasticity, and 6.1 MPa for modulus of rupture.Results are comparable to what has been found for other tree species, such as Pinus radiata D. Don (radiata pine), Pinus taeda L. (loblolly pine), and Larix decidua Mill. (European larch). Models for predicting density, modulus of elasticity, and modulus of rupture based on NIR spectra outperformed simple regression models using the mean annual ring width as the independent variable.NIR spectroscopy is a rapid tool for characterising organic materials. It requires minimal sample preparation and spectra are collected on solid wood, rapidly and nondestructively. For these reasons the method should be tested in production lines for lumber. In future research we aim for reliable predictions of mechanical properties of industrially manufactured lumber using models based on NIR spectroscopy and multivariate statistical methods.
Forfattere
Håkon BorchSammendrag
Rapportering av påvekstalgeundersøkelse i 6 bekker rundt Eidsvatnet Bjugn kommune - Vurdering av eutrofiering.
Forfattere
Per Otto Flæte Erlend Ystrøm HaartveitSammendrag
Det er ikke registrert sammendrag
Forfattere
Dag-Ragnar BlystadSammendrag
I Norge gir dette viruset først og fremst skade i potet. Det er ett av to virus som gir nekrotiske ringer i potetknoller. Men som hagebruker blir en først og fremst kjent med viruset gjennom de symptomene en kan se i stauder, og blant dem er peon den viktigste. Symptomene i peon kan bestå i alt fra svak fargeskifting i de grønne bladene " mosaikk " til kraftige gule båndmønstre og ringstrukturer.
Forfattere
Arne StensvandSammendrag
Raud marg (Phytopphthora fragariae var. fragariae) er ein karanteneskadegjerar som angrip jordbær og nokre andre artar innan rosefamilien.
Forfattere
Arne StensvandSammendrag
Raud rotròte (Phytophthora fragariae var. rubi) er ein karanteneskadegjerar som angrip bringebær og hybridar av bringebær.
Forfattere
Anne Straumfors Halstensen Karl-Christian Nordby Wijnand Eduard Sonja KlemsdalSammendrag
Inhalation of immunomodulating mycotoxins produced by Fusarium spp. that are commonly found in grain dust may imply health risks for grain farmers. Airborne Fusarium and mycotoxin exposure levels are mainly unknown due to difficulties in identifying Fusarium and mycotoxins in personal aerosol samples. We used a novel real-time PCR method to quantify the fungal trichodiene synthase gene (tri5) and DNA specific to F. langsethiae and F. avenaceum in airborne and settled grain dust, determined the personal inhalant exposure level to toxigenic Fusarium during various activities, and evaluated whether quantitative measurements of Fusarium-DNA could predict trichothecene levels in grain dust. Airborne Fusarium-DNA was detected in personal samples even from short tasks (10-60 min). The median Fusarium-DNA level was significantly higher in settled than in airborne grain dust (p < 0.001), and only the F. langsethiae-DNA levels correlated significantly in settled and airborne dust (r(s) = 0.20, p = 0.003). Both F. langsethiae-DNA and tri5-DNA were associated with HT-2 and T-2 toxins (r(s) = 0.24-0.71, p < 0.05 to p < 00.01) in settled dust, and could thus be suitable as indicators for HT-2 and T-2. The median personal inhalant exposure to specific toxigenic Fusarium spp. was less than 1 genome m(-3), but the exposure ranged from 0-10(5) genomes m(-3). This study is the first to apply real-time PCR on personal samples of inhalable grain dust for the quanti. cation of tri5 and species- specific Fusarium-DNA, which may have potential for risk assessments of inhaled trichothecenes.
Sammendrag
Det er ikke registrert sammendrag