| 1671. |
- Poetzelsberger, Elisabeth, et al.
(författare)
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Mapping the patchy legislative landscape of non-native tree species in Europe
- 2020
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Ingår i: Forestry (London). - : Oxford University Press. - 0015-752X .- 1464-3626. ; 93:4, s. 567-586
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Tidskriftsartikel (refereegranskat)abstract
- Europe has a history rich in examples of successful and problematic introductions of trees with a native origin outside of Europe (non-native trees, NNT). Many international legal frameworks such as treaties and conventions and also the European Union have responded to the global concern about potential negative impacts of NNT that may become invasive in natural ecosystems. It is, however, national and regional legislation in particular that affects current and future management decisions in the forest sector and shapes the landscapes of Europe. We identified all relevant legal instruments regulating NNT, the different legal approaches and the regulatory intensity in 40 European countries (no microstates). Information on hard and effective soft law instruments were collected by means of a targeted questionnaire and consultation of international and national legislation information systems and databases. In total, 335 relevant legal instruments were in place in June/July 2019 to regulate the use of NNT in the investigated 116 geopolitical legal units (countries as well as sub-national regions with their own legislation). Countries and regions were empirically categorized according to ad hoc-defined legislation indicators. These indicators pay respect to the general bans on the introduction of non-native species, the generally allowed and prohibited NNT, approval mechanisms and specific areas or cases where NNT are restricted or prohibited. Our study revealed a very diverse landscape of legal frameworks across Europe, with a large variety of approaches to regulating NNT being pursued and the intensity of restriction ranging from very few restrictions on species choice and plantation surface area to the complete banning of NNT from forests. The main conclusion is that there is a clear need for more co-ordinated, science-based policies both at the local and international levels to enhance the advantages of NNT and mitigate potential negative effects.
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| 1672. |
- Pokrupa, Nils, et al.
(författare)
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One Year of In-Flight Results from the Prisma Formation Flying Demonstration Mission
- 2011
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Ingår i: 25th Annual AIAA/USU Conference on Small Satellites.
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Konferensbidrag (refereegranskat)abstract
- The Prisma smallsat in-orbit test-bed was launched on the 15th of June, 2010 to demonstrate strategies and technologies for formation flying and rendezvous. The mission consists of two spacecraft: Mango and Tango. Mango is 3-axis stabilized and is equipped with a propulsion system providing full 3D orbit control capability. Tango has a simplified solar magnetic control system and does not have any orbit control capability. The two spacecraft were launched clamped together into a 720/780 km altitude sun synchronous dawn-dusk orbit, and later separated in August of 2010. Since then, the two spacecraft, and rather lean operations team, have been performing a steady march through a tight mission and experiment timeline. This paper gives an overview of the Prisma mission in general and will focus on the lessons that have been learned from running a relatively intense, yet lean, small satellite technology demonstration mission. It has proven to show the value of autonomy and small platform applications, allowing for a high return on effort. Spacecraft autonomy and small, highly competent teams have allowed for quick and cost effective adaptations to changes and problem situations. The broad range of flight results from only one year in operation support these conclusions.
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| 1673. |
-
Proceedings of the Resource Efficient Vehicles Conference - 2021 (rev2021)
- 2021
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Proceedings (redaktörskap) (övrigt vetenskapligt/konstnärligt)abstract
- rev2021 was the first edition of the conference on Resource Efficient Vehicles, held online on 14-16 June 2021. This vehicle-centric conference aims to bring together participants from academia, industry and public agencies to discuss research from all relevant fields connected to resource efficiency in all motorised modes of transport and interdependent surrounding systems. The theme of this multidisciplinary conference is Resolving Functional Conflicts in Vehicle Design, a theme explored through topics including modelling for multifunctional design; making trade-offs; efficient use of materials and space; integrating new solutions; transforming the product system; transforming the vehicle-transport system; sustainable design; and early-stage design. The 2021 edition of the conference consisted of 40 selected papers for presentation at the conference, complemented with four workshops, five keynote lectures from invited speakers, and a concluding panel discussion with four invited participants. It was organised by the Centre for ECO2 Vehicle Design at KTH Royal Institute of Technology in Stockholm.
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| 1674. |
- Puttonen, Irma, et al.
(författare)
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Distribution and estimated release of sediment phosphorus in the northern Baltic Sea archipelagos
- 2014
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Ingår i: Estuarine, Coastal and Shelf Science. - : Elsevier BV. - 0272-7714 .- 1096-0015. ; 145, s. 9-21
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Tidskriftsartikel (refereegranskat)abstract
- Phosphorus contents in the sediments were determined in archipelago areas of the northern Baltic Sea (Svealand in Sweden and Aland, SW Finland and W Uusimaa in Finland) during 2008-2012. Spatial and vertical distribution of phosphorus was studied by analysing sediment samples from 345 stations of different seabed substrate types. A sequential extraction method was applied to evaluate the pool of the potentially mobile phosphorus, i.e., the amount of phosphorus that can be expected to be released from sediments to water with time, and possibly support primary production. In addition, vertical distribution of immobile phosphorus forms in the sediments was used as a tool to assess phosphorus burial. The uppermost 2 cm of sediments were calculated to contain 126,000 tonnes of phosphorus in the study area covering 19,200 km(2) of the seafloor. Subtracting the assumed average background content (i.e. that assumed to be buried) of this total phosphorus content gave an estimation of 31,000-37,000 tonnes of potentially mobile phosphorus at the sediment surface. Redox sensitive iron-bound phosphorus accounts for two thirds of this pool. Compared with the total phosphorus input from the catchment of the entire Baltic Sea 29,000 tonnes in 2009 it can be concluded that the store of phosphorus that can be released with time from the sediments is large, and that internal phosphorus recycling processes thus may play a key role in phosphorus fluxes in the coastal zone. Spreading of hypoxia in the future, as recent modelling and sediment proxy results suggest, is likely to severely deteriorate the water quality, particularly in the archipelago areas where the water exchange is slow.
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| 1675. |
- Rai, Neha, 1985-, et al.
(författare)
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Metal contaminated soil leachates from an art glass factory elicit stress response, alter fatty acid metabolism and reduce lifespan in Caenorhabditis elegans
- 2019
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Ingår i: Science of the Total Environment. - : Elsevier. - 0048-9697 .- 1879-1026. ; 651, s. 2218-2227
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Tidskriftsartikel (refereegranskat)abstract
- The present study evaluated the toxicity of metal contamination in soils from an art glass factory in Smaland Sweden using a Caenorhabditis elegans nematode model. The aim of the study was to chemically analyze the soil samples and study the biological effects of water-soluble leachates on the nematodes using different physiological endpoints. The total metal content showed that As, Cd and Pb were at levels above the guideline values for soils in areas around the factory. Less than 10% of the total metal content in the soil was found in the water-soluble leachates, however, Al, As, Fe and Pb remained higher than the guideline values for safe drinking water. Exposure of C. elegans to the water-soluble leachates, at both post-hatching larvae stage (L1-young adult) for 48 h and at the young adult stage (L4) for 6 h, showed significant gene alteration. Although the nematodes did not exhibit acute lethality, lifespan was significantly reduced upon exposure. C. elegans also showed altered gene expression associated with stress response and fat metabolism, as well as enhanced accumulation of body fat. The study highlighted the significance of assessing environmental samples using a combination of gene expression analysis, fatty acid metabolism and lifespan for providing valuable insight into the negative impact of metals. The altered fat metabolism and reduced lifespan on exposure to soil leachates motivates further studies to explore the mechanism of the toxicity associated with the metals present in the environment.
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| 1676. |
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| 1677. |
- Raj, Akanksha, et al.
(författare)
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Molecular synergy in biolubrication: The role of cartilage oligomeric matrix protein (COMP) in surface-structuring of lubricin.
- 2017
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Ingår i: Journal of colloid and interface science. - : Elsevier BV. - 1095-7103 .- 0021-9797. ; 495, s. 200-206
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Tidskriftsartikel (refereegranskat)abstract
- Synovial surfaces are lubricated by biomolecular aggregates that act in synergy, and lubricin is one key biolubricant. Its molecular structure allows extensive hydration and this is conducive to its lubrication performance. However, in order to fullfil its lubrication function it needs to be anchored and oriented on the surface in a proper way. We suggest that cartilage oligomeric matrix protein (COMP) is one of the biomolecules that promotes anchoring of lubricin in a fashion that facilitates lubrication.Weakly hydrophobic poly(methyl methacrylate) (PMMA) surfaces were coated by COMP and lubricin, individually and in combinations. Adsorption was investigated using a quartz crystal microbalance, and friction between the biopolymer-coated surfaces was determined by employing the atomic force microscope-colloidal probe technique.It was found that COMP facilitated firm directed attachment of lubricin in a manner that resulted in low friction forces, significantly lower than what was achieved when lubricin was directly adsorbed to PMMA. Evidently, COMP provides means for lubricin to attach strongly and in a favourable conformation for efficient lubrication of this surface. We suggest that our findings can be extrapolated to cartilage surfaces, where co-localization of COMP and lubricin has been demonstrated.
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| 1678. |
- Ramchuran, Santosh, et al.
(författare)
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Production of heterologous thermostable glycoside hydrolases and the presence of host-cell proteases in substrate limited fed-batch cultures of Escherichia coli BL21(DE3)
- 2002
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Ingår i: Applied Microbiology and Biotechnology. - : Springer Science and Business Media LLC. - 1432-0614 .- 0175-7598. ; 60:4, s. 408-416
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Tidskriftsartikel (refereegranskat)abstract
- Metabolic stress is a phenomenon often discussed in conjunction with recombinant protein production in Escherichia coli. This investigation shows how heterologous protein production, and the presence of host cell proteases is related to: i) IPTG induction, ii) cell mass concentration at the time of induction and iii) the presence of metabolites (glutamic acid or those from TSB) during the post induction phase of high-cell-density (HCD) fed-batch cultivations. Two thermostable xylanase variants and one thermostable cellulase, all originating from Rhodothermus marinus were expressed in E. coli strain BL21 (DE3). A three-fold difference in the specific activity of both xylanase variants [between 7000 and 21000 U / (g cdw)], was observed under the different conditions tested. Upon induction at high cell-mass concentrations employing a nutrient feed devoid of the metabolites above, the specific activity of the xylanase variants, was initially higher but decreased 2-3 h into the post induction phase and simultaneously protease activity was detected. Furthermore, protease activity was detected in all induced cultivations employing this nutrient feed, but was undetected in uninduced control cultivations (final cell mass concentration of 40 g/L), as well as in induced cultivations employing metabolite supplemented nutrient feeds. By contrast, maximum specific cellulase activity [between 700 and 900 U / (g cdw)] remained relatively unaffected in all cases. We have established that detectable host cell proteases was not the primary reason for the post-induction activity decrease observed under certain conditions, and possible causes for the differing production levels of heterologous proteins are discussed.
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| 1679. |
- Randahl, Ann-Christin, 1967-
(författare)
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Strategiska skribenter : skrivprocesser i fysik och svenska
- 2014
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The purpose of this study is to explore how experienced student writers in Swedish schools handle two different writing tasks, a lab report in physics and a text to be written within Swedish as a school subject. Applying a dialogical perspective on writing, the study is an attempt to explore what role subject contexts play for the students’ writing processes and to what extent the strategies used by the students are more individual. The writing tasks were solved outside of class, a frequent, but relatively unexplored way of organizing writing tasks in upper secondary school in Sweden.The results of the study indicate that different subject contexts enforce the emergence of different writing processes. The lab report was written in a certain order, from easy to difficult parts. Each part of the text was written on its own. Editing affecting the macrostructure of the text did not occur. In contrast, when writing the text within Swedish as a school subject, the paragraphs were developed at several different times during the writing process and questions concerning the global structure of the text seem constantly to have presented themselves. Extensive deletions were performed, and new angles to the subject introduced, affecting the macrostructure of the text.Writing processes are also individual. In a close-up study, three students – here called Kerstin, Paula and Sara – video filmed their work with the two texts. The texts were logged by the students, writing on Google Drive. In this material the individual strategies come out in basically two ways: in the resources chosen by the students as well as in their editing of their texts. Kerstin may be said to have used “herself” or, rather, a general writing ability. For Paula, her father functioned as an important resource. Sara was the one of the three who used digital media most frequently. In the students’ editing patterns, above all, Kerstin and Sara differed significantly. Kerstin did her editing during the formulation stage, regardless of writing task, while Sara mainly did her editing after the formulation stage.
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| 1680. |
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