| 1. |
- Baison, J., et al.
(författare)
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Genetic control of tracheid properties in Norway spruce wood
- 2020
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Ingår i: Scientific Reports. - : Nature Research. - 2045-2322. ; 10:1
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Tidskriftsartikel (refereegranskat)abstract
- Through the use of genome-wide association studies (GWAS) mapping it is possible to establish the genetic basis of phenotypic trait variation. Our GWAS study presents the first such effort in Norway spruce (Picea abies (L). Karst.) for the traits related to wood tracheid characteristics. The study employed an exome capture genotyping approach that generated 178 101 Single Nucleotide Polymorphisms (SNPs) from 40 018 probes within a population of 517 Norway spruce mother trees. We applied a least absolute shrinkage and selection operator (LASSO) based association mapping method using a functional multi-locus mapping approach, with a stability selection probability method as the hypothesis testing approach to determine significant Quantitative Trait Loci (QTLs). The analysis has provided 30 significant associations, the majority of which show specific expression in wood-forming tissues or high ubiquitous expression, potentially controlling tracheids dimensions, their cell wall thickness and microfibril angle. Among the most promising candidates based on our results and prior information for other species are: Picea abies BIG GRAIN 2 (PabBG2) with a predicted function in auxin transport and sensitivity, and MA_373300g0010 encoding a protein similar to wall-associated receptor kinases, which were both associated with cell wall thickness. The results demonstrate feasibility of GWAS to identify novel candidate genes controlling industrially-relevant tracheid traits in Norway spruce. © 2020, The Author(s).
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| 2. |
- Chen, Zhi-Qiang, et al.
(författare)
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Genetic analysis of fiber dimensions and their correlation with stem diameter and solid-wood properties in Norway spruce
- 2016
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Ingår i: Tree Genetics & Genomes. - : Springer Science and Business Media LLC. - 1614-2942 .- 1614-2950. ; 12:6
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Tidskriftsartikel (refereegranskat)abstract
- Adverse genetic correlations between growth traits and solid-wood, as well as fiber traits are a concern in conifer breeding programs. To evaluate the impact of selection for growth and solid-wood properties on fiber dimensions, we investigated the inheritance and efficiency of early selection for different wood-fiber traits and their correlations with stem diameter, wood density, modulus of elasticity (MOE), and microfibril angle (MFA) in Norway spruce (Picea abies L). The study was based on two large open-pollinated progeny trials established in southern Sweden in 1990 with material from 524 families comprising 5618 trees. Two increment cores were sampled from each tree. Radial variations from pith to bark were determined for rings 3–15 with SilviScan for fiber widths in the radial (RFW) and tangential (TFW) direction, fiber wall thickness (FWT), and fiber coarseness (FC). Fiber length (FL) was determined for rings 8–11. Heritabilities based on rings 8–11 using joint-site data were moderate to high (0.24–0.51) for all fiber-dimension traits. Heritabilities based on stem cross-sectional averages varied from 0.34 to 0.48 and reached a plateau at rings 6–9. The “age-age†genetic correlations for RFW, TFW, FWT, and FC cross-sectional averages at a particular age with cross-sectional averages at ring 15 reached 0.9 at rings 4–7. Our results indicated a moderate to high positive genetic correlation for density and MOE with FC and FWT, moderate and negative with RFW, and low with TFW and FL. Comparison of several selection scenarios indicated that the highest profitability is reached when diameter and MOE are considered jointly, in which case, the effect on any fiber dimension is negligible. Early selection was highly efficient from ring 5 for RFW and from rings 8–10 for TFW, FWT, and FC.
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| 3. |
- Holmen, Lotta, et al.
(författare)
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Simulation Study of Power Limitation for City Trams
- 2016
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Ingår i: Proceedings of the 11th ITS European Congress.
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Konferensbidrag (refereegranskat)abstract
- In this paper, we describe a simulation study aimed at investigating whether a momentary limitation of the tram power-output can be effective in reducing current overload, while maintaining the tram performance at an acceptable level. The study was performed on a single-fed tram section in Gothenburg, Sweden. The simulation results indicate that an adaptive power output limitation, which is only activated when the current and current derivative is above certain limits, is effective in reducing current peaks, while still maintaining required tram performance. Thus, this method could be used to reduce or eliminate power failure on the tram net, without causing unacceptable tram delay.
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| 4. |
- Nilsson, Helena, et al.
(författare)
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Bark Suberin as a Renewable Source of Long-Chain omega-Hydroxyalkanoic Acids
- 2008
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Ingår i: Macromolecular Symposia. - : Wiley. - 1022-1360 .- 1521-3900. ; 272:1, s. 104-106
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Tidskriftsartikel (refereegranskat)abstract
- Polycondensations of cis-9,10-epoxy-18-hydroxyoctadecanoic acid, isolated from birch outer bark, were performed at 75 degrees C in toluene as solvent and at 85 degrees C in bulk using immobilized Candida antarctica lipase B as catalyst. The polycondensation performed in toluene in presence of molecular sieves gave a polyester with DP 50 after 24 h. The same DP was obtained at much shorter reaction time (3 h) by bulk polymerization in an open vial without any drying agent present.
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| 5. |
- Nilsson, Helena, et al.
(författare)
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Birch bark as a source for fine chemicals
- 2008
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Ingår i: 2008 Nordic Wood Biorefinery Conference - Proceedings. - 9789186018139 ; , s. 125-128
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Konferensbidrag (refereegranskat)abstract
- In this study we report polycondensation and co-polymerization of cis-9,10-epoxy-18-hydroxyoctadecanoic acid (1) isolated from birch outer bark using immobilized Candida antarctica lipase B (Novozyme 435) as catalyst to give epoxy activated straight chain polyesters and cyclic macromonomers.
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| 6. |
- Söderberg, Kristina, et al.
(författare)
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Kompetenspasset : Ett samverkansprojekt drivet av Arbetsförmedlingen, Myndigheten för yrkeshögskolan, RISE Research Institute of Sweden. Slutrapport 2024-06-30
- 2024
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Projektet Kompetenspasset har sitt ursprung i de stora utmaningar som Sverige står inför när det gäller kompetensförsörjning på en snabbt föränderlig arbetsmarknad och det samverkansprogram som inleddes under den förra regeringsperioden. Behovet av att kunna dokumentera och erkänna både formellt, icke-formellt och informellt lärande har ökat, och EU-rådets rekommendation kring mikromeriter har varit en drivkraft för att ta fram och testa hur en gemensam svensk modell för mikromeriter skulle kunna se ut och utformas.Projektet har bedrivits som ett samverkansprojekt mellan RISE Research Institutes of Sweden, som har lett projektet; Arbetsförmedlingen, som har bidragit med arbetsmarknadsinsikter och praktisk testning av mikromeriter; och Myndigheten för yrkeshögskolan, som har arbetat med hur SeQF och mikromeriter kan komplettera varandra. Projektet har pågått mellan 2021-09-01 till och med 2024- 06-30.För att möjliggöra detta projekts genomförande har projektet beviljats ekonomiska medel av Vinnova – Sveriges innovationsmyndighet, tillsammans med medfinansiering från projektets partners.
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