Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2009
Authors
Peder GjerdrumAbstract
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.
Abstract
No abstract has been registered
Authors
Carl Gunnar Fossdal Igor A. Yakovlev Ari M. Hietala Halvor SolheimAbstract
To identify differentially expressed genes of the white-rot fungus Heterobasidion parviporum subtractive cDNA libraries were constructed using suppressive subtraction hybridization (SSH) technique with RNA extracted from an advanced stage of decay area and from colonization front next to the reaction zone of the stem of a mature Norway spruce trees. Besides cytochrome P450s and proteins with unknown function, the SSH libraries constructed contained genes involved in basic cellular processes, andcell wall degradation. To examine the role of selected candidate genes three trees, showing a variable degree of wood decay, were used for real-time RT-PCR profiling of candidate genes. In the decay transition areas the study revealed activity centers that showed remarkable similarity in the transcript profiles of monitored genes.
Abstract
Published data of pH and conductivity in some acid humic waters have shown erroneous corresponding values. This means that the values were not consistent with each other according to well-recognized hydrochemistry. A main questions was arised in this connection. Were the measurements correct and if not which of them were wrong, pH, conductivity or both ? Assessment on basis of calculated and measured conductivity values, by using published data and own measurements, indicate primarily erroneous pH measurements. This makes the scientific papers which are based on these remarkable results partly of questionable value. Conductivity should generally act as a controlling parameter even if the latter also could have some uncertainties.
Authors
Keith MacMillan Solveig Haukeland Robbie Rae Iain Young John Crawford Simona Hapca Michael WilsonAbstract
No abstract has been registered
Abstract
No abstract has been registered
Authors
Troy J. Seiler Daniel Rasse Jiahong Li Paul Dijkstra Hans P. Anderson David P. Johnson Thomas L. Powell Bruce A. Hungate C. Ross Hinkle Bert G. DrakeAbstract
No abstract has been registered
Abstract
No abstract has been registered
Abstract
There is a need to establish new objective and sensitive methods for early detection and quantification of decay fungi in wood materials. Molecular methods have proven to be a useful tool within wood protection issues, however, this field is still poorly explored and so far relatively few have used these methods within the field of wood deterioration. Among the techniques used in the indirect quantification of fungi in decayed wood and building material are chitin and ergosterol assays. DNA-based methods are rarely used for identification in connection with quantification. Access to knowledge about fungal colonisation paterns in different wood substrates would allow further improvement of new products. The aim of this study was to investigate the colonisation pattern of decay fungi in wood samples after six years in soil exposure, in an EN252 test.....
Abstract
One of the main challenges for modified wood and modified wood based WPCs (Wood Plastic Composites) is to predict accurate service life time in UC3 (Use class 3, above ground) and UC4 (in soil or fresh water contact). So far, data from in-service conditions are rare, while several studies have evaluated the durability in lab or field test exposure. However, there is still a lack of studies comparing replicate modified wood products in both field and lab exposure. This study evaluates the efficacy of modified wood and modified wood based WPCs in AWPA E10, three different types of soil in lab (ENV 807), three test fields in-ground (EN 252) and two test sites close to ground (horizontal double layer test)......