| 1. |
- Cornelissen, Johannes H C, et al.
(författare)
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Global negative vegetation feedback to climate warming responses of leaf litter decomposition rates in cold biomes
- 2007
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Ingår i: Ecology Letters. - : Wiley. - 1461-023X .- 1461-0248. ; 10:7, s. 619-627
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Tidskriftsartikel (refereegranskat)abstract
- Whether climate change will turn cold biomes from large long-term carbon sinks into sources is hotly debated because of the great potential for ecosystem-mediated feedbacks to global climate. Critical are the direction, magnitude and generality of climate responses of plant litter decomposition. Here, we present the first quantitative analysis of the major climate-change-related drivers of litter decomposition rates in cold northern biomes worldwide.Leaf litters collected from the predominant species in 33 global change manipulation experiments in circum-arctic-alpine ecosystems were incubated simultaneously in two contrasting arctic life zones. We demonstrate that longer-term, large-scale changes to leaf litter decomposition will be driven primarily by both direct warming effects and concomitant shifts in plant growth form composition, with a much smaller role for changes in litter quality within species. Specifically, the ongoing warming-induced expansion of shrubs with recalcitrant leaf litter across cold biomes would constitute a negative feedback to global warming. Depending on the strength of other (previously reported) positive feedbacks of shrub expansion on soil carbon turnover, this may partly counteract direct warming enhancement of litter decomposition.
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| 2. |
- Eriksson K., Susanna, et al.
(författare)
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Geometrical and energetical structural changes in organic dyes for dye-sensitized solar cells probed using photoelectron spectroscopy and DFT
- 2016
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Ingår i: Physical Chemistry, Chemical Physics - PCCP. - : Royal Society of Chemistry (RSC). - 1463-9076 .- 1463-9084. ; 18:1, s. 252-260
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Tidskriftsartikel (refereegranskat)abstract
- The effects of alkoxy chain length in triarylamine based donor acceptor organic dyes are investigated with respect to the electronic and molecular surface structures on the performance of solar cells and the electron lifetime. The dyes were investigated when adsorbed on TiO2 in a configuration that can be used for dye sensitized solar cells (DSCs). Specifically, the two dyes D35 and D45 were compared using photoelectron spectroscopy (PES) and density functional theory (DFT) calculations. The differences in solar cell characteristics when longer alkoxy chains are introduced in the dye donor unit are attributed to geometrical changes in dye packing while only minor differences were observed in the electronic structure. A higher dye load was observed for D45 on TiO2. However, D35 based solar cells result in higher photocurrent although the dye load is lower. This is explained by different geometrical structures of the dyes on the surface.
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| 3. |
- Lindblad, Rebecka, et al.
(författare)
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Electronic Structure of CH3NH3PbX3 Perovskites : Dependence on the Halide Moiety
- 2015
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Ingår i: The Journal of Physical Chemistry C. - American Chemical Society : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 119:4, s. 1818-1825
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Tidskriftsartikel (refereegranskat)abstract
- A combination of measurements using photoelectron spectroscopy and calculations using density functional theory (DFT) was applied to compare the detailed electronic structure of the organolead halide perovskites CH3NH3PbI3 and CH3NH3PbBr3. These perovskite materials are used to absorb light in mesoscopic and planar heterojunction solar cells. The Pb 4f core level is investigated to get insight into the chemistry of the two materials. Valence level measurments are also included showing a shift of the valence band edges where there is a higher binding energy of the edge for the CH3NH3PbBr3 perovskite. These changes are supported by the theoretical calculations which indicate that the differences in electronic structure are mainly caused by the nature of the halide ion rather than structural differences. The combination of photoelectron spectroscopy measurements and electronic structure calculations is essential to disentangle how the valence band edge in organolead halide perovskites is governed by the intrinsic difference in energy levels of the halide ions from the influence of chemical bonding.
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| 4. |
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| 5. |
- Boman, Krister K., et al.
(författare)
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Long-term outcomes of childhood cancer survivors in Sweden : a population-based study of education, employment, and income
- 2010
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Ingår i: Cancer. - : Wiley. - 0008-543X .- 1097-0142. ; 116:5, s. 1385-1391
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Studies of different national populations were indispensable for estimating the impact of illness-related disability on social outcomes in adult childhood cancer survivors. The effects of childhood cancer on educational attainment, employment, and income in adulthood in a Swedish setting were studied. METHODS: The study population was a national cohort of 1.46 million Swedish residents, including 1716 survivors of childhood cancer diagnosed before their 16th birthday, followed up in 2002 in registries at >25 years of age. Main outcomes were educational attainment, employment, and net income. Markers of persistent disability were considered, and outcomes were analyzed with multivariate linear and logistic regression models adjusted for age, sex, and socioeconomic indicators of the childhood households. RESULTS: Non-central nervous system (CNS) cancer survivors had similar education, employment, and income as the general population in adjusted models, whereas survivors of CNS tumors more often had no more than basic (< or =9 years) education (relative risk [RR], 1.80 [95% confidence interval (95% CI), 1.45-2.23]), less often attained education beyond secondary school (RR, 0.69 [95% CI, 0.58-0.81]), and less often were employed (RR, 0.85 [95% CI, 0.77-0.94]). Predicted net income from work was lower in CNS tumor survivors (P <.001) than in the general population, even after the exclusion of individuals who received economic disability compensation. CONCLUSIONS : CNS tumor survivors had poorer social outcomes compared with the general population, whereas outcomes for survivors of other childhood cancers were similar to the general population. Established late effects highlighted the importance of improved, safer pediatric CNS tumor treatment protocols and surveillance that identified individual needs for preventive and remedial measures.
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| 6. |
- Ekeus, C., et al.
(författare)
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Preterm birth, social disadvantage, and cognitive competence in Swedish 18- to 19-year-old men
- 2010
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Ingår i: Pediatrics. - : American Academy of Pediatrics (AAP). - 0031-4005 .- 1098-4275. ; 125:1, s. e67-73
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: The aim was to study the impact of a range of gestationalages (GAs) on cognitive competence in late adolescence and howthis effect is modified by contextual social adversity in childhood. METHODS: This was a register study based on a national cohortof 119664 men born in Sweden from 1973 to 1976. Data on GA andother perinatal factors were obtained from the Medical BirthRegister, and information on cognitive test scores was extractedfrom military conscription at the ages of 18 to 19 years. Testscores were analyzed as z scores on a 9-point stanine scale,whereby each unit is equivalent to 0.5 SD. Socioeconomic indicatorsof the childhood household were obtained from the Populationand Housing Census of 1990. The data were analyzed by multivariatelinear regression. RESULTS: The mean cognitive test scores decreased in a stepwisemanner with GA. In unadjusted analysis, the test scores were0.63 stanine unit lower in men who were born after 24 to 32gestational weeks than in those who were born at term. The differencein global scores between the lowest and highest category ofsocioeconomic status was 1.57. Adjusting the analysis for thechildhood socioeconomic indicators decreased the effect of GAon cognitive test scores by 26% to 33%. There was also a multiplicativeinteraction effect of social adversity and moderately pretermbirth on cognitive test scores. CONCLUSIONS: This study confirms previous claims of an incrementalassociation of cognitive competence with GA. Socioeconomic indicatorsin childhood modified this effect at all levels of preterm birth.
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| 7. |
- Hjern, Anders, et al.
(författare)
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Disability in adult survivors of childhood cancer : a Swedish national cohort study.
- 2007
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Ingår i: J Clin Oncol. - 1527-7755 .- 0732-183X. ; 25:33, s. 5262-6
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Disability in adult survivors of childhood cancer: a Swedish national cohort study.Hjern A, Lindblad F, Boman KK.Karolinska Institutet, Childhood Cancer Research Unit, Astrid Lindgren Children's Hospital Q6:05, 171 76 Stockholm, Sweden.PURPOSE: We studied the effects of childhood or adolescent cancer and cancer treatment on disability as indicated by persistent aid needs in adult life. PATIENTS AND METHODS: A group of 2,503 survivors of childhood cancer diagnosed before their 16th birthday were studied with data from registers in a national cohort of 1.91 million Swedish residents. Disability indicators were created from information in national registers about income (sickness pension, handicap allowance), personal assistance, and family situation in 2002. Multivariate logistic regression on the log scale was used to estimate relative risk (RR) ratios. RESULTS: A total of 7.6% of survivors received handicap allowance indicating permanent disability, including brain tumors (14.0%), other solid tumors (6.3), and leukemias/lymphomas (2.9%), compared with 0.6% in the general population. Twenty-six percent of survivors of CNS tumor and 10% of survivors of solid tumors had at least one indication of a disability. Younger age at diagnosis suggested a higher risk for disability. CNS tumor survivors had an RR of 10.7 (95% CI, 9.3 to 12.8) for having at least one disability indication compared with the noncancer population, whereas leukemia and lymphoma survivors had an RR of 3.0, and survivors of other cancers had an RR of 3.8. Survivors of CNS tumor only had an increased RR for living in the parental household (RR = 1.6; 95% CI, 1.4 to 1.9). CONCLUSION: Childhood cancer survivors more often have persistent needs of supportive measures provided by community and/or the parental household. The survivors of CNS tumors were at particular risk, indicating a need of safer treatment protocols, and tailored follow-up, prevention, and rehabilitation to address this persistent social disability.PMID: 18024873 [PubMed - indexed for MEDLINE]
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| 8. |
- Lindelöf, Linnea, et al.
(författare)
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A survey of ficolin-3 activity in Systemic Lupus Erythematosus reveals a link to hematological disease manifestations and autoantibody profile
- 2024
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Ingår i: Journal of Autoimmunity. - : Elsevier. - 0896-8411 .- 1095-9157. ; 143
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Tidskriftsartikel (refereegranskat)abstract
- The complement system plays a central role in the pathogenesis of Systemic Lupus Erythematosus (SLE), but most studies have focused on the classical pathway. Ficolin-3 is the main initiator of the lectin pathway of complement in humans, but its role in systemic autoimmune disease has not been conclusively determined. Here, we combined biochemical and genetic approaches to assess the contribution of ficolin-3 to SLE risk and disease manifestations. Ficolin-3 activity was measured by a functional assay in serum or plasma samples from Swedish SLE patients (n = 786) and controls matched for age and sex (n = 566). Genetic variants in an extended 300 kb genomic region spanning the FCN3 locus were analyzed for their association with ficolin-3 activity and SLE manifestations in a Swedish multicenter cohort (n = 985). Patients with ficolin-3 activity in the highest tertile showed a strong enrichment in an SLE cluster defined by anti-Sm/DNA/nucleosome antibodies (OR 3.0, p < 0.001) and had increased rates of hematological disease (OR 1.4, p = 0.078) and lymphopenia (OR = 1.6, p = 0.039). Genetic variants associated with low ficolin-3 activity mapped to an extended haplotype in high linkage disequilibrium upstream of the FCN3 gene. Patients carrying the lead genetic variant associated with low ficolin3 activity had a lower frequency of hematological disease (OR 0.67, p = 0.018) and lymphopenia (OR 0.63, p = 0.031) and fewer autoantibodies (p = 0.0019). Loss-of-function variants in the FCN3 gene were not associated with SLE, but four (0.5 %) SLE patients developed acquired ficolin-3 deficiency where ficolin-3 activity in serum was depleted following diagnosis of SLE. Taken together, our results provide genetic and biochemical evidence that implicate the lectin pathway in hematological SLE manifestations. We also identify lectin pathway activation through ficolin-3 as a factor that contributes to the autoantibody response in SLE.
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| 9. |
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| 10. |
- Posti, Piia K
(författare)
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The Double Aspect : Gerald Murnane's Visual Poetics
- 2005
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- With its abundance of maps, place names, and landscapes, and with titles like Inland and Landscape with Landscape, Gerald Murnane's fiction exemplifies the dominance of land in Australian literature. Yet, Murnane's fiction differs from most "landscape fiction" in that it depicts an Australia that despite its history of exploration has not yet been fully discovered. Murnane posits a vision of Australia as a place with a twofold character: it is throroughly mapped yet unexplored at the same time.Taking account of that twofold character, this study argues that Murnane's constant preoccupation with matters of vision and visuality is an attempt to flesh out a visual mode that could intimate the other Australia that has been overwritten by the imperial narrative. By investigating the complex interrelations bewteen the structures of vision/visuality and the figures of exile, landscape, and woman in Murnane's narratives, the study traces the emergence of a visual poetics of doubleness as a possible disturbance of colonial landscaping. The various doublings in Murnane's fiction create a gap through which a different perspective may emerge, a perspective that allows an (un)reading of the "Carteisan" gaze inherent in the imperial narrative. The duplication of vision can be understood as a counter-praxis that challenges the scopic regime of "Cartesian perspectivalism".In order to discuss the complexity of this doubleness, the study introduces the two-pronged concept of the double aspect, which denotes both the deconstructive move that enables the (un)reading, and the idosyncratic mode of representation that is at work in Murnane's fiction. Through the double aspect, Murnane's fiction fashions a visual poetics that enables a reconstitution of Australia as a site/sight for continuous re-viewing and rediscovery on an aesthetic plane.
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