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Sökning: WFRF:(Jonsson Anders) > Göteborgs universitet > (2005-2009)

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1.
  • Bräutigam, Marcus, 1968, et al. (författare)
  • Development of Swedish winter oat with gene technology and molecular breeding
  • 2006
  • Ingår i: J. Seed Science. - 0039-6990. ; 116:1-2, s. 12-35
  • Tidskriftsartikel (refereegranskat)abstract
    • In Sweden, oat (Avena sativa) is only grown as a spring crop. A Swedish winter oat, on the other hand, would give increased yields and would secure oat in Swedish agriculture. During three consecutive winters we performed field trials with oat aiming at identifying potential winter material. More than 300 varieties, originating from breeding programs all over the world, were tested. Plants were rated according to winter survival, vigour and general performance during the following growth season and more than 20 lines were identified that were cold hardier than present commercial oat varieties. In parallel experiments a cDNA library was constructed from cold induced English winter oat (Gerald) and ca 10000 EST sequences were generated. After data mining a UniGene set of 2800 oat genes was obtained. By detailed analysis of microarray data from cold stressed Arabidopsis and by advanced bioinformatics, gene interactions in the complex cold induced signal transduction pathway were deduced. By comparison to the oat UniGene set, several genes potentially involved in the regulation of cold hardiness in oat were identified. An Agrobacterium mediated transformation protocol was developed for one oat genotype. Key regulatory genes in cold acclimation will be introduced to oat by genetic transformation or modified by TILLING. Such genes will be used as molecular markers in intogression of winter hardiness to commercial oat.
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2.
  • Allwood, Carl Martin, 1952, et al. (författare)
  • Child witnesses meta-memory realism
  • 2006
  • Ingår i: Scandinavian Journal of Psychology. - 0036-5564 .- 1467-9450. ; 47, s. 461-470
  • Tidskriftsartikel (refereegranskat)
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3.
  • Allwood, Carl Martin, 1952, et al. (författare)
  • Child witnesses’ metamemory realism
  • 2006
  • Ingår i: Scandinavian Journal of Psychology. - : Wiley. - 0036-5564 .- 1467-9450. ; 47, s. 461-470
  • Tidskriftsartikel (refereegranskat)abstract
    • This study investigated the degree of realism in the confidence judgments of 11-12 year old children (N=81) of their answers to questions relating to a short film clip showing a kidnapping event. Four different confidence scales were used: a numeric scale, a picture scale, a line scale, and a written scale. The results demonstrated that the children showed a high level of overconfidence in their memories. However, no significant differences between the four confidence scales were found. The results indicate that, at least in the context investigated, 11-12 year-old children’s confidence in their event memory show poor realism. A comparison with previous research on adults indicates that children show noticeably poorer realism.
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4.
  • Allwood, Carl Martin, 1952, et al. (författare)
  • The effects of source and type of feedback on child witnesses' metamemory accuracy
  • 2005
  • Ingår i: Applied Cognitive Psychology. - : Wiley. - 0888-4080 .- 1099-0720. ; 19:3, s. 331-344
  • Tidskriftsartikel (refereegranskat)abstract
    • This study investigated the effect of feedback on the accuracy (realism) of 12-year-old children's metacognitive judgments of their answers to questions about a film clip. Two types of judgments were investigated: confidence judgments (on each question) and frequency judgments (i.e. estimates of overall accuracy). The source of feedback, whether it was presented as provided by a teacher or a peer child, did not influence metacognitive accuracy. Four types of feedback were given depending on whether the participant's answer was correct and depending on whether the feedback confirmed or disconfirmed the child's answer. The children showed large overconfidence when they received confirmatory feedback but much less so when they received disconfirmatory feedback. The children gave frequency judgments implying that they had more correct answers than they actually had. No main gender differences were found for any of the measures. The results indicate a high degree of malleability in children's metacognitive judgments.
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5.
  • Bajor, Antal, 1962, et al. (författare)
  • Normal or increased bile acid uptake in isolated mucosa from patients with bile acid malabsorption.
  • 2006
  • Ingår i: Eur J Gastroenterol Hepatol. - 0954-691X. ; 18:4, s. 397-403
  • Tidskriftsartikel (refereegranskat)abstract
    • Introduction: Bile acid malabsorption as reflected by an abnormal 75Se-labelled homocholic acid-taurine (75SeHCAT) test is associated with diarrhoea, but the mechanisms and cause-and-effect relations are unclear. Objectives: Primarily, to determine whether there is a reduced active bile acid uptake in the terminal ileum in patients with bile acid malabsorption. Secondarily, to study the linkage between bile acid malabsorption and hepatic bile acid synthesis. Methods: Ileal biopsies were taken from patients with diarrhoea and from controls with normal bowel habits. Maximal active bile acid uptake was assessed in ileal biopsies using a previously validated technique based on uptake of 14C-labelled taurocholate. To monitor the hepatic synthesis, 7[alpha]-hydroxy-4-cholesten-3-one, a bile acid precursor, was assayed in blood. The 75SeHCAT-retention test was used to diagnose bile acid malabsorption. Results: The taurocholate uptake in specimens from diarrhoea patients was higher compared with the controls [median, 7.7 (n=53) vs 6.1 [mu]mol/g per min (n=17)] (P<0.01) but no difference was seen between those with bile acid malabsorption (n=18) versus diarrhoea with a normal 75SeHCAT test (n=23). The 75SeHCAT values and 7[alpha]-hydroxy-4-cholesten-3-one were inversely correlated. Conclusions: The data do not support bile acid malabsorption being due to a reduced active bile acid uptake capacity in the terminal ileum. (C) 2006 Lippincott Williams & Wilkins, Inc.
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6.
  • Barreto Henriksson, Helena, et al. (författare)
  • Transplantation of human mesenchymal stems cells into intervertebral discs in a xenogeneic porcine model.
  • 2009
  • Ingår i: Spine. - 1528-1159. ; 34:2, s. 141-8
  • Tidskriftsartikel (refereegranskat)abstract
    • STUDY DESIGN: Experimental and descriptive study of a xenotransplantation model in minipigs. OBJECTIVE: To study survival and function of human mesenchymal stem cells (hMSCs) after transplantation into injured porcine spinal discs, as a model for cell therapy. SUMMARY OF BACKGROUND DATA: Biologic treatment options of the intervertebral disc are suggested for patients with chronic low back pain caused by disc degeneration. METHODS: Three lumbar discs in each of 9 minipigs were injured by aspiration of the nucleus pulposus (NP), 2 weeks later hMSCs were injected in F12 media suspension (cell/med) or with a hydrogel carrier (Puramatrix) (cell/gel). The animals were sacrificed after 1, 3, or 6 months. Disc appearance was visualized by magnetic resonance imaging. Immunohistochemistry methods were used to detect hMSCs by antihuman nuclear antibody staining, and further performed for Collagen II, Aggrecan, and Collagen I. SOX 9, Aggrecan, Versican, Collagen IA, and Collagen IIA and Collagen IIB human mRNA expression was analyzed by real-time PCR. RESULTS: At magnetic resonance imaging all injured discs demonstrated degenerative signs. Cell/gel discs showed fewer changes compared with cell/med discs and only injured discs at later time points. hMSCs were detected in 9 of 10 of the cell/gel discs and in 8 of 9 of the cell/med discs. Immunostaining for Aggrecan and Collagen type II expression were observed in NP after 3 and 6 months in gel/cell discs and colocalized with the antihuman nuclear antibody. mRNA expression of Collagen IIA, Collagen IIB, Versican, Collagen 1A, Aggrecan, and SOX9 were detected in both cell/med and cell/gel discs at the time points 3 and 6 months by real-time PCR. CONCLUSION: hMSCs survive in the porcine disc for at least 6 months and express typical chondrocyte markers suggesting differentiation toward disc-like cells. As in autologous animal models the combination with a three-dimensional-hydrogel carrier seems to facilitate differentiation and survival of MSCs in the disc. Xenotransplantation seems to be valuable in evaluating the possibility for human cell therapy treatment for intervertebral discs.
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7.
  • Björntorp Mark, Elisabeth, 1964, et al. (författare)
  • Expression of genes involved in the regulation of p16 in psoriatic involved skin
  • 2006
  • Ingår i: Arch Dermatol Res. - : Springer Science and Business Media LLC. - 0340-3696. ; 297:10, s. 459-67
  • Tidskriftsartikel (refereegranskat)abstract
    • It has been suggested that the up-regulation of the tumour suppressor p16 gene and induction of senescence protect the phenotype of psoriatic involved skin from malignant transformation. On the other hand, Id1, which is inversely correlated with p16 has been shown to be up-regulated in psoriatic involved skin. To test the hypothesis that there may be an altered regulation of p16 in psoriatic involved skin, we have measured genes involved in the Igf-1 receptor signalling through the Ras/MAPK cascade. Igf-1R, IGFBP3, hRas, Ets2, JunB, Egr-1, Id1, MIDA1 and p16 gene expressions were measured using quantitative real-time PCR in total RNA isolated from punch biopsies from psoriatic involved (n = 9) and uninvolved skin (n = 9) and from cutaneous squamous cell cancer (SCC) involved (n = 8) and uninvolved skin (n = 8). The IGFBP3, hRas, JunB, Egr-1, Id1 and MIDA1 genes were up-regulated in psoriatic involved skin compared with uninvolved skin. The p16, JunB and MIDA1 genes were up-regulated in SCC involved skin compared with uninvolved skin. Our results indicate that there may be a balance between the proliferation and induction of senescence in psoriasis. This balance may vary and the psoriatic involved skin represented in this study appears to be in a proliferative state rather than senescence. Furthermore, we suggest that the noted up-regulation of JunB, which has been shown to up-regulate p16, in combination with the previously reported elevation of p16 expression in psoriatic involved skin, may indicate activation of a pathway by which JunB may protect the psoriatic plaque by inducing p16 in an event of malignant stress.
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8.
  • Jonsson, Mattias, et al. (författare)
  • Cost-effectiveness of silvicultural measures to increase substrate availability for red-listed wood-living organisms in Norway spruce forests
  • 2006
  • Ingår i: Biological Conservation. - : Elsevier. - 0006-3207 .- 1873-2917. ; 127:4, s. 443-467
  • Tidskriftsartikel (refereegranskat)abstract
    • It is important that measures to maintain biodiversity are taken in a way that is cost-effective for the landowner. We analyzed the cost-effectiveness of silvicultural measures that aim at increasing the substrate availability for red-listed (species that are threatened, near threatened or where species probably are threatened but data is deficient) saproxylic (wood-inhabiting) organisms. We modelled stands of Norway spruce (Picea abies) in three regions of Sweden by using computer simulations and a database with substrate requirements of saproxylic beetles and cryptogams on the Swedish Red-List. Conclusions concerning cost-effectiveness of silvicultural measures depend on the extinction thresholds of the species they are intended to conserve; measures that generate only small amounts of coarse woody debris (CWD) may provide too little substrate to be useful for species with high extinction thresholds. In northern Sweden, forestland is relatively inexpensive, so a cost-effective strategy to increase the amount of spruce CWD was to set aside more forests as reserves. In central and southern Sweden, more emphasis should instead be given to increasing the amount of CWD in the managed forest. The regulations by the Forest Stewardship Council (FSC) could be made more cost-effective by prescribing creation of more high stumps and retention of larger amounts of naturally dying trees. Large-sized CWD, CWD from slow-growing trees, and CWD in late decay stages are substrate types that were particularly rare in managed forest in relation to unmanaged forests. Manual soil scarification and retention of living trees are measures that can increase the proportion of these underrepresented CWD types.
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9.
  • Kanis, John A, et al. (författare)
  • Assessment of fracture risk.
  • 2005
  • Ingår i: Osteoporosis international. - : Springer Science and Business Media LLC. - 0937-941X .- 1433-2965. ; 16:6, s. 581-9
  • Tidskriftsartikel (refereegranskat)abstract
    • The diagnosis of osteoporosis is based on the measurement of bone mineral density (BMD). There are a number of clinical risk factors that provide information on fracture risk over and above that given by BMD. The assessment of fracture risk thus needs to be distinguished from diagnosis to take account of the independent value of the clinical risk factors. These include age, a prior fragility fracture, a parental history of hip fracture, smoking, use of systemic corticosteroids, excess alcohol intake and rheumatoid arthritis. The independent contribution of these risk factors can be integrated by the calculation of fracture probability with or without the use of BMD. Treatment can then be offered to those identified to have a fracture probability greater than an intervention threshold.
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10.
  • Karlsson, Camilla, 1977, et al. (författare)
  • Notch and HES5 are regulated during human cartilage differentiation.
  • 2007
  • Ingår i: Cell and tissue research. - : Springer Science and Business Media LLC. - 0302-766X .- 1432-0878. ; 327:3, s. 539-51
  • Tidskriftsartikel (refereegranskat)abstract
    • The molecular mechanisms of cartilage differentiation are poorly understood. In a variety of tissues other than cartilage, members of the basic helix-loop-helix (bHLH) family of transcription factors have been demonstrated to play critical roles in differentiation. We have characterized the human bHLH gene HES5 and investigated its role during chondrogenesis. Blockage of the Notch signaling pathway with a gamma-secretase inhibitor has demonstrated that the human HES5 gene is a downstream marker of Notch signaling in articular chondrocytes. Markers for the Notch signaling pathway significantly decrease during cartilage differentiation in vitro. Cell proliferation assayed by using BrdU has revealed that blockage of Notch signaling is associated with significantly decreased proliferation. Northern blot and reverse transcription/polymerase chain reaction of a panel of various tissues have shown that HES5 is transcribed as a 5.4-kb mRNA that is ubiquitously expressed in diverse fetal and adult tissues. Articular cartilage from HES5(-/-) and wild-type mice has been analyzed by using various histological stains. No differences have been detected between the wild-type and HES5(-/-) mice. Our data thus indicate that the human HES5 gene is coupled to the Notch receptor family, that expression of Notch markers (including HES5) decreases during cartilage differentiation, and that the blockage of Notch signaling is associated with significantly decreased cell proliferation.
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