| 1. |
- Abrahamsson, Maria, et al.
(författare)
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A new strategy for the improvement of photophysical properties in ruthenium(II) polypyridyl complexes. Synthesis and photophysical and electrochemical characterization of six mononuclear ruthenium(II) bisterpyridine-type complexes
- 2005
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Ingår i: Inorganic Chemistry. - : American Chemical Society (ACS). - 0020-1669 .- 1520-510X. ; 44:9, s. 3215-3225
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Tidskriftsartikel (refereegranskat)abstract
- The synthesis and characterization of six ruthenium(II) bistridentate polypyridyl complexes is described. These were designed on the basis of a new approach to increase the excited-state lifetime of ruthenium(II) bisterpyridine-type complexes. By the use of a bipyridylpyridyl methane ligand in place of terpyridine, the coordination environment of the metal ion becomes nearly octahedral and the rate of deactivation via ligand-field (i.e., metal-centered) states was reduced as shown by temperature-dependent emission lifetime studies. Still, the possibility to make quasi-linear donor-ruthenium-acceptor triads is maintained in the complexes. The most promising complex shows an excited-state lifet me of tau = 15 ns in alcohol solutions at room temperature, which should be compared to a lifetime of tau = 0.25 ns for [Ru(tpy)(2)](2+). The X-ray structure of the new complex indeed shows a more octahedral geometry than that of [Ru(tpy)(2)](2+). Most importantly, the high excited-state energy was retained, and thus, so was the potential high reactivity of the excited complex, which has not been the case with previously published strategies based on bistridentate complexes.
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| 2. |
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| 3. |
- Björk, Mikael, et al.
(författare)
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Marinarkeologisk undersökning och dokumentation av skeppsvraket Constantia : RAÄ Torhamn 96 (L1978:1899)
- 2024
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Blekinge museum har på uppdrag av Länsstyrelsen i Blekinge undersökt och dokumenterat vraket efter flöjtskeppet Constantia (1676), beläget öster om Inlängan i Blekinge skärgård. Lämningen dokumenterades genom fotogrammetri och manuell uppmätning. Därutöver sågades fem prov för dendrokronologisk analys och ett fyra tegelstenar bärgades för ICP-analys. Området runt vraket metalldetekterades och flera större utslag noterades, möjligtvis kanoner. På lämningen påträffades en träsked samt flera metallfragment från en klocka vilka skyddsbärgades efter samråd med Länsstyrelsen. Undersökningen visar att lämningen trots sitt nedbrutna tillstånd innehåller flera välbevarade och orörda arkeologiska kontexter vilka kan ge en unik inblick i livet ombord på ett krigsfartyg under stormaktstiden och inte minst användningen av bestyckade handelsfartyg. Därutöver illustrerar hela händelseförloppet kring Constantias förlisning på det strategiska behovet av en flottbas i södra Östersjön, ett behov som Karlskrona därefter kommit att tillgodose.
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| 4. |
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| 5. |
- Eriksson, Johan, et al.
(författare)
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Technocracy, Politicization and Non-involvement : Politics of Expertise in the European Regulation of Chemicals
- 2010
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Ingår i: Review of Policy Research. - : Wiley. - 1541-132X .- 1541-1338. ; 27:2, s. 167-185
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Tidskriftsartikel (refereegranskat)abstract
- This article addresses the relationship between scientific expertise and policy in European chemicals regulation. We argue that the role of scientific expertise in the European regulation of chemicals varies across decision-making levels, countries, and stages of the policy process. Our case study of the role of scientific expertise in the regulation of brominated flame retardants illustrates considerably different manifestations of this interconnected process across regulatory arenas, even though this case concerns a single group of substances. On the European Union level, we find a mix of technocracy and politicization; in Sweden, a clear-cut politicization; and in Poland, noninvolvement. Such differences can be explained by a combination of factors, in particular frame dominance, and mobilization of advocacy coalitions. [ABSTRACT FROM AUTHOR] Copyright of Review of Policy Research is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.
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| 6. |
- Eriksson, Maertha, et al.
(författare)
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Insect brain plasticity : effects of olfactory input on neuropil size
- 2019
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Ingår i: Royal Society Open Science. - : The Royal Society. - 2054-5703. ; 6:8
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Tidskriftsartikel (refereegranskat)abstract
- Insect brains are known to express a high degree of experience-dependent structural plasticity. One brain structure in particular, the mushroom body (MB), has been attended to in numerous studies as it is implicated in complex cognitive processes such as olfactory learning and memory. It is, however, poorly understood to what extent sensory input per se affects the plasticity of the mushroom bodies. By performing unilateral blocking of olfactory input on immobilized butterflies, we were able to measure the effect of passive sensory input on the volumes of antennal lobes (ALs) and MB calyces. We showed that the primary and secondary olfactory neuropils respond in different ways to olfactory input. ALs show absolute experience-dependency and increase in volume only if receiving direct olfactory input from ipsilateral antennae, while MB calyx volumes were unaffected by the treatment and instead show absolute age-dependency in this regard. We therefore propose that cognitive processes related to behavioural expressions are needed in order for the calyx to show experience-dependent volumetric expansions. Our results indicate that such experience-dependent volumetric expansions of calyces observed in other studies may have been caused by cognitive processes rather than by sensory input, bringing some causative clarity to a complex neural phenomenon.
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| 7. |
- Eriksson, Maertha, et al.
(författare)
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Structural plasticity of olfactory neuropils in relation to insect diapause
- 2020
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Ingår i: Ecology and Evolution. - : Wiley. - 2045-7758. ; 10:24, s. 14423-14434
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Tidskriftsartikel (refereegranskat)abstract
- Many insects that live in temperate zones spend the cold season in a state of dormancy, referred to as diapause. As the insect must rely on resources that were gathered before entering diapause, keeping a low metabolic rate is of utmost importance. Organs that are metabolically expensive to maintain, such as the brain, can therefore become a liability to survival if they are too large. Insects that go through diapause as adults generally do so before entering the season of reproduction. This order of events introduces a conflict between maintaining low metabolism during dormancy and emerging afterward with highly developed sensory systems that improve fitness during the mating season. We investigated the timing of when investments into the olfactory system are made by measuring the volumes of primary and secondary olfactory neuropils in the brain as they fluctuate in size throughout the extended diapause life-period of adult Polygonia c-album butterflies. Relative volumes of both olfactory neuropils increase significantly during early adult development, indicating the importance of olfaction to this species, but still remain considerably smaller than those of nondiapausing conspecifics. However, despite butterflies being kept under the same conditions as before the dormancy, their olfactory neuropil volumes decreased significantly during the postdormancy period. The opposing directions of change in relative neuropil volumes before and after diapause dormancy indicate that the investment strategies governing structural plasticity during the two life stages could be functionally distinct. As butterflies were kept in stimulus-poor conditions, we find it likely that investments into these brain regions rely on experience-expectant processes before diapause and experience-dependent processes after diapause conditions are broken. As the shift in investment strategies coincides with a hard shift from premating season to mating season, we argue that these developmental characteristics could be adaptations that mitigate the trade-off between dormancy survival and reproductive fitness.
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| 8. |
- Eriksson, Sofia, et al.
(författare)
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Current distribution of older and deciduous forests as legacies from historical use patterns in a Swedish boreal landscape (1725–2007)
- 2010
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Ingår i: Forest Ecology and Management. - : Elsevier BV. - 0378-1127 .- 1872-7042. ; 260:7, s. 1095-1103
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Tidskriftsartikel (refereegranskat)abstract
- We combine historical maps and satellite derived data to reconstruct the development of a Swedish boreal landscape over the past 300 years. The aim is to understand legacies from past use patterns in present-day forest composition and consequences for conservation objectives from a landscape perspective. We analyze landscape development in cross-tabulation matrixes, building change trajectories. These trajectories are tested in linear models to explain the distribution of present-day landscape composition of coniferous, mixed, and deciduous forests >110 years. Of 49 tested change trajectories, 11 showed a significant association. Associations for mixed and coniferous forests were similar and linked to characteristics such as forest continuity, which characterized the studied landscape. Deciduous older forests did not show any association to forest continuity but were more likely to occur on areas that specifically shifted from forests with grazing in the 1720s to open impediment (likely indicating low tree coverage) in the 1850s. There were large shifts and spatial redistribution in ownerships over time. Use patterns and legacies varied between small- and large-scale ownership categories as well as within small-scale categories. The legacies found in the study indicate a complex origin of heterogeneous landscape elements such as older deciduous forests. Additionally, the origin of the legacies indicates a potential need to diversify conservation management based on the influence of past use patterns. Despite large inconsistencies in historical and contemporary data we argue that this type of analysis could be used to further understand the distribution of landscape elements important for conservation objectives.
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| 9. |
- Eriksson, Sofia, et al.
(författare)
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Historical perspepctives on landscape representation and forest composition in Woodland Key Habitats compared to formally protected forest in boreal Sweden
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Habitats of Swedish conservation interests are in general small and fragmented following the extensive and intensive forest management history. This study covering 71 000 ha of boreal Sweden investigates how history influences present-day distribution and composition of forests identified as high conservation value habitats and how they are protected. We also investigated if the habitat criteria used to describe reservations differed between reservation types and if habitat criteria were associated with the size of Woodland Key Habitats. The results show strong effects from historical ownership and historical forest type on the probability of an area being set aside as formally protected or as voluntary protected Woodland Key Habitats. We also found that both formal reservations and Woodland Key Habitats primarily cover coniferous forest in the age interval 70-110 years but not the presumably most valuable oldest coniferous category >110 or deciduous forests, which are as common in reservations as in other areas. Old deciduous forests (>110 years) are significantly more rare in formal reservations compared to the forest matrix. When viewed in a context of fragmentation and edge effects the results underline the importance of evaluating reserved areas and Woodland Key Habitats in a wider temporal and larger spatial perspective to optimize conservation management efforts. Maximal representation and biodiversity can be better achieved if new reservations are chosen to represent different ownership and forest history, and if they are selected in a landscape context related to present reservations and the present surrounding production forest.
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| 10. |
- Eriksson, Sofia, et al.
(författare)
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Interactions between historical forest composition and ownership affect present composition of older forest in boreal Sweden
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- In this study we reconstruct forest composition during the 1860s for a 71000 ha area in southern boreal Sweden. The aim is to show how historical ownership and associated anthropogenic disturbances act as a source of heterogeneity in the present-day distribution and composition of coniferous and deciduous forest within the commercial production forest. We use older (>110 years) and mature (70-110 years) forest as response variables in generalized linear models with a binominal error distribution. The explanatory variables include size of zone, historical type of ownership zone (village, company, and farm), amount of forest, and forest type. We focus in particular on investigating effects from interacting explanatory variables. The significant statistical associations in the study indicate that patterns of deciduous and coniferous older patches differ, and that deciduous patches differ in relation to age interval. The oldest deciduous patches, for example, are today more likely on areas that had deciduous cover also in the past and stood on forestland managed by farmers, but less likely on the same habitat managed by companies. We show that there are strong effects on present forest composition from historical ownership and forest composition. We argue that by including local data on past ownership combined with knowledge on use patterns management could be better adapted to local landscape dynamics compared to the application of overly generalized patterns or models of boreal dynamics that excludes interactions with management.
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