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
Terje HaugSammendrag
Det er ikke registrert sammendrag
Forfattere
Torstein KvammeSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Ove BergersenSammendrag
Det er ikke registrert sammendrag
Forfattere
Ove BergersenSammendrag
Det er ikke registrert sammendrag
Forfattere
Kari StensgaardSammendrag
Seterlandskapet vekker gode følelser hos mange, men vi kan ha forskjellige innfallsvinkler. Noen ser verdiene i storslagen natur og dyr på beite, andre i tilgjengelighet og tilrettelagte opplevelser. Enkelte har størst interesse av effektivt jordbruk, mens andre er opptatt av historie og tradisjoner. Det ligger store utfordringer i å forvalte et landskap hvor mange og til dels motstridende interesser er involvert. Målet må være både bruk og bevaring.
Forfattere
Mette Hansen Rikke Pilmann Laursen Bent Egberg MikkelsenSammendrag
Background: Nutrition‟s impact on an individual‟s health and sustainable consumption of food are issues that have long been on both the public and political agenda but are often viewed as two separate debates. This is surprising since many innovation projects in food service systems are concerned with both healthy eating and sustainable consumption (organic food). The relationship between them forms the background in this study. Evidence has shown that caterers serving organic food tend to also serve healthier meals than their non-organic counterparts but, so far, no studies have been carried out in school food environments. Aim: The aim of this report was to investigate and develop appropriate methods for studying the link between healthy eating practices and organic food procurement policies using Danish public elementary schools as a setting. Methods: Based on relevant scientific literature, the Danish Dietary Recommendations, and inspired by other successful studies, a self-administered questionnaire investigating children‟s eating habits was designed. After testing by an Expert Evaluation Panel and Think Aloud Interviews adjustments were integrated. Conclusion: If special attention is given to literacy skills and cognitive development, children in Danish 6th grade classes can be used as respondents in studies of the relation between food procurement policies and eating practice. The study suggests that a Cross-Sectional design is a satisfactory method to investigate the association between organic procurement policies and children‟s eating habits. A variation of a 24-hour Recall study, a Food Frequency Questionnaire and a method developed during the reported study to identify children‟s knowledge of fruit and vegetables may be combined to cover children‟s overall eating habits. The study suggests that representative 6th grade classes at schools with organic food policies can be selected by cluster sampling and matched with corresponding classes at schools without organic food policies, after which the results could be compared.
Forfattere
David M. Gadoury Belachew Asalf M. Catherine Heidenreich Maria Luz Herrero Mary Jean Welser Robert C. Seem Anne Marte Tronsmo Arne StensvandSammendrag
A collection of clonal isolates of Podosphaera aphanis was heterothallic, and was composed of two mutually exclusive mating types. Cleistothecial initials approximately 30 µm were observed within 7 to 14 days after pairing of compatible isolates and developed into morphologically mature ascocarps within 4 weeks on both potted plants maintained in isolation and in field plantings in New York, USA and southern Norway. Ascospores progressed through a lengthy maturation process over winter, during which (i) the conspicuous epiplasm of the ascus was absorbed, (ii) the osmotic potential of the ascospore cytoplasm increased, resulting in bursting of prematurely-freed spores in water, and finally (iii) the development of physiologically mature, germinable, and infectious ascospores. Release of overwintered ascospores from field collections was coincident with renewed plant growth in spring. Overwintered cleistothecia readily dehisced when wetted, and released ascospores onto glass slides, detached strawberry leaves, and leaves of potted plants. Plant material so exposed to discharged ascospores developed macroscopically-visible mildew colonies within 7 to 10 days while non-inoculated controls remained mildew free. Scanning electron and light microscopy studies revealed that cleistothecia of P. aphanis were enmeshed within a dense mat of hyphae on the persistent leaves of field-grown strawberry plants, and were highly resistant to removal by rain while these leaves remained alive. In contrast, morphologically mature cleistothecia on leaves of 11 deciduous perennial plant species were readily detached by simulated rain and seemed adapted for passive dispersal by rain to other substrates. Contrary to many previous reports, cleistothecia appear to be a functional source of primary inoculum for strawberry powdery mildew. They furthermore differ substantially from cleistothecia of powdery mildews of many deciduous perennial plants in their propensity to remain attached to the persistent leaves of their host during the intercrop period.
Forfattere
Peder GjerdrumSammendrag
The Scots pine is one of the most important raw materials for the wood industry. The pine is straight and strong, and easily preservation treated. The objective of this study was to describe and analyse the accuracy of diameter observations by varying technologies, and to have a first indication for the applicability of RFID tracing logs in the pole industry. Observations were made on barked poles with calliper, 2D scanner and 3D scanner. The local variation in diameter can be indicated by a standard deviation of 3 to 5 mm for repeated observation in almost the same location, and the same magnitude for actual diameter profile deviation from a smoothed profile. In a 3D scanner, the amount of observed data is huge, making it a challenge to analyse, verify and calibrate the equipment. Nevertheless, the accuracy seems acceptable for observations on barked logs. The RFID technology might find uses in permanent applications, but it is still rather work consuming and expensive, and the commercial profit has so far not been identified.
Forfattere
Tor J. JohansenSammendrag
Utviklingshastigheten gjennom diapause (dvale) og etter diapause fram mot klekking er undersøkt for en tidlig og en seintklekkende populasjon (bestand) av stor kålflue. For den tidlige typen forløp utviklingen om vinteren gradvis og var avsluttet seint på våren. Den seine typen gikk inn i en ny fase om våren med en høyere terskeltemperatur (ca 7 °C), med utsatt klekking som resultat. Etter diapause hadde begge populasjonene en terskeltemperatur på omtrent 2 °C for utvikling fram til klekking.