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.
2007
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Sammendrag
Ein LC-MS/MS metode for å bestemme 11 fytoøstostrogesambindingar vart utvikla og validert. Alle 11 kunne påvisast i kumjølk.
Sammendrag
An LC-MS/MS method for determination of 11 phytoestrogens was developed and validated. All was demonstrated presencet in dairy milk.
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Forfattere
Stig Morten Thorsen Lars Egil HaugenSammendrag
In the process of studying how climatic changes will influence important forage crops at high latitudes, van Oijen et al. (2005) developed a plant model for two grass species, timothy (Phleum pratense L.) and perennial ryegrass (Lolium perenne L.). In order to study winter survival of the plants, the plant model requires routines to simulate winter conditions, such as snow accumulation, soil frost, ice cover and soil temperature. This report describes the development of the SnowFrost model that simulates snow accumulation and the formation of soil frost. Routines for simulating ice encasement will be added at a later stage. The SnowFrost model implements a degree-day-temperatureindex method in the snowmelt routines, and an energy balance approach to get an algebraic expression for soil frost formation. Our main focus when developing the winter model is to adequately simulate winter conditions from the plant's point of view, rather than accurately simulate the depths of snow cover and soil frost penetration. Simulations for a site with cold and stable winter conditions show promising results, and indicate that SnowFrost is suitable as a foundation for the continuing work of developing the winter routines for the plant model.
Forfattere
Tor J. JohansenSammendrag
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Forfattere
Tor J. JohansenSammendrag
Studies have focused on the progress of diapause and post-diapause development in one early- and one late-emerging population of D. floralis at various temperatures. For the early emerging biotype, diapause progressed gradually at low temperatures and terminated in late spring. For the late emerging biotype also, diapause progressed gradually for a certain period, but did not end, no matter the duration of chilling. For both populations, diapause developed faster at constant 18 ºC compared to combinations with chilling periods, implicating that chilling was not a prerequisite for diapause development. For the late emerging population, results indicated a second phase of diapause development with a threshold temperature of about 7 "C. However, the rate of this second phase development did not increase linearly with temperatures but had an optimum at about 12 "C. Post-diapause development for both populations was similar and had a lower threshold of about 2 "C. Results explain how delayed emergence in some populations are regulated.
Sammendrag
Histological properties of the graft union between a rootstock and scion may provide a mechanistic explanation why dwarfing rootstocks are able to reduce the growth of the tree. In order to investigate the relationship between growth and the amount of functional xylem tissue of potted sweet cherry trees, an experiment was conducted during 2002-2003. One year old field budded and bench grafted (from greenhouse) sweet cherry trees of the cultivars Van, Ulster and Lapins in all combinations of the three rootstocks Prunus avium seedling, Colt and Gisela 5 were grown in pots for two growing seasons. After shoot extension had terminated when trees were in full leaf the second year, the total growth of the different parts of the trees and the functional area using safranin staining were measured. The total mass production (tree dry weight, the length of two year old wood and number of leaves) was significantly larger in the budded trees. Similarly the trunk cross sectional area was significantly larger 10 cm above and in the middle of the graft union, but not 10 cm below it. The Colt trees were the most vigorous followed by the seedling and Gisela 5. Minor differences between the different cultivars were registered. Xylem staining with aqueous safranin combined with quantitative image analysis showed that the rootstock stem had a higher proportion of stained tissue than the scion stem. Sections taken in the middle of the graft tissue and 10 cm above showed that the proportion of stained tissue declined proportionally with the distance from the roots. The total area of stained stem xylem was larger for the two vigorous rootstocks compared to Gisela 5. Small differences were observed between cultivars and propagation methods.