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1.
  • Thompson, Luke R., et al. (creator_code:aut_t)
  • A communal catalogue reveals Earth's multiscale microbial diversity
  • 2017
  • record:In_t: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 551:7681, s. 457-463
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Our growing awareness of the microbial world's importance and diversity contrasts starkly with our limited understanding of its fundamental structure. Despite recent advances in DNA sequencing, a lack of standardized protocols and common analytical frameworks impedes comparisons among studies, hindering the development of global inferences about microbial life on Earth. Here we present a meta-analysis of microbial community samples collected by hundreds of researchers for the Earth Microbiome Project. Coordinated protocols and new analytical methods, particularly the use of exact sequences instead of clustered operational taxonomic units, enable bacterial and archaeal ribosomal RNA gene sequences to be followed across multiple studies and allow us to explore patterns of diversity at an unprecedented scale. The result is both a reference database giving global context to DNA sequence data and a framework for incorporating data from future studies, fostering increasingly complete characterization of Earth's microbial diversity.
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2.
  • Dahl, Martin, 1984-, et al. (creator_code:aut_t)
  • First assessment of seagrass carbon accumulation rates in Sweden: A field study from a fjord system at the Skagerrak coast
  • 2023
  • record:In_t: PLoS Climate. - : Public Library of Science (PLoS). - 2767-3200. ; 2:1
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Seagrass meadows are globally important blue carbon sinks. In northern cold-temperate regions, eelgrass (Zostera marina) is the dominant seagrass species, and although their sedimentary carbon stocks have been quantified across regions, information regarding the CO2 withdrawal capacity as carbon sinks remains scarce. Here we assessed the carbon (Corg) accumulation rates (CARs) and stocks as well as the organic matter sources in five seagrass meadows in the Gullmar Fjord area on the Swedish Skagerrak coast. We found that the mean (±SD) CAR was 14 ± 3 g Corg m-2 yr-1 over the last ~120–140 years (corresponding to a yearly uptake of 52.4 ± 12.6 g CO2 m-2). The carbon sink capacity is in line with other Z. marina areas but relatively low compared to other seagrass species and regions globally. About half of the sedimentary carbon accumulation (7.1 ± 3.3 g Corg m-2 yr-1) originated from macroalgae biomass, which highlights the importance of non-seagrass derived material for the carbon sink function of seagrass meadows in the area. The Corg stocks were similar among sites when comparing at a standardized depth of 50 cm (4.6–5.9 kg Corg m-2), but showed large variation when assessed for the total extent of the cores (ranging from 0.7 to 20.6 kg Corg m-2 for sediment depths of 11 to at least 149 cm). The low sediment accretion rates (1.18–1.86 mm yr-1) and the relatively thick sediment deposits (with a maximum of >150 cm of sediment depth) suggests that the carbon stocks have likely been accumulated for an extended period of time, and that the documented loss of seagrass meadows in the Swedish Skagerrak region and associated erosion of the sediment could potentially have offset centuries of carbon sequestration.
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3.
  • Faber, Adrian, et al. (creator_code:aut_t)
  • Critical design goggles: Explorative use of critical design perspectives in a video production project
  • 2014
  • record:In_t: SIDER’14 Royal Institute of Technology, KTH, Stockholm, Sweden, April 11-12, 2014.. ; , s. -5
  • swepub:Mat_conferencepaper_t (swepub:level_refereed_t)abstract
    • This paper is built on a study that intends to develop a method by creating a set of tools based on selected parts from critical design and critical design theory. The goals of these tools are to function as instruments enabling practical implementation of critical design in a design and/or production process. In this study we develop the tools for critical design work and test our tools in a specific production process of a music video to explore how to apply critical design practically. Indoing so we used design-oriented research methods. By bringing together critical design perspectives and the practice of video production, this study wishes to contribute to the work of bridging the gap between theory and practice in critical design.
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4.
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5.
  • Bommarco, Riccardo, et al. (creator_code:aut_t)
  • Genetic and phenotypic differences between thistle populations in response to habitat and weed management practices
  • 2010
  • record:In_t: Biological Journal of the Linnean Society. - : Oxford University Press (OUP). - 0024-4066 .- 1095-8312. ; 99:4, s. 797-807
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Rapid evolutionary change is increasingly being recognized as commonplace, but the evolutionary consequences for species and ecosystems under human-induced selection regimes have not been explored in detail, although many species occur in such environments. In a common garden experiment and with amplified fragment length polymorphism markers, we examined whether genetic differentiation has taken place between spatially intermixed populations of creeping thistles Cirsium arvense (Asteraceae) collected from a natural habitat (maritime shores), a semi-natural habitat (road verges) and arable fields under two management regimes: conventional and organic farming. Populations of C. arvense have altered genetically and locally adapted their growth patterns with changed land use. Although plants from different habitats showed similar total biomass production, shoot and root production was higher for maritime populations, suggesting selection for increased competitive ability. Competitive ability then declined in the order semi-natural, conventional farms and organic farms. Thistles in arable fields may be more selected for tolerance against disturbances from herbicides and mechanical weed control. In addition, early shoot sprouting and genetic analysis showed differentiation between plants originating from conventional farms and farms that were converted to organic 9–30 years ago, suggesting some adaptation to altered crop cultivation practices
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6.
  • Bredenberg, Johan, et al. (creator_code:aut_t)
  • Modeling zinc sulfhydryl bonds in zinc fingers
  • 2001
  • record:In_t: International Journal of Quantum Chemistry. - : Wiley. - 0020-7608 .- 1097-461X. ; 83:3-4, s. 230-244
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Molecular dynamics simulations have been carried out employing three different model descriptions of the zinc sulfhydryl interactions in class II fingers. One bonded and two nonbonded models were studied. Two variant structures of the glucocorticoid receptor DNA-binding; domain and a NMR structure from a fragment of methionyl-tRNA synthetase were subjected to long-time MD simulations with these models. Our analysis is focused on comparison with experimental and quantum mechanical data, concerning the local Zn-finger and overall structural and dynamic properties for these models. All models performed M ell, but the nonbonded models appeared to reproduce the protein dynamics in better agreement with experimental data than does the bonded description.
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7.
  • Dahl, Martin, et al. (creator_code:aut_t)
  • Effects of seagrass overgrazing on sediment erosion and carbon sink capacity : Current understanding and future priorities
  • 2021
  • record:In_t: Limnology and Oceanography Letters. - : Wiley. - 2378-2242. ; 6:6, s. 309-319
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We searched the literature for experimental and observational studies assessing the effects of seagrass overgrazing on erosion of sediment and sedimentary organic carbon (SOC) and found that most studies reported a significant impact, likely caused by a cascading effect (i.e., seagrass shoot loss -> belowground biomass degradation -> sediment destabilization or SOC erosion). However, there appears to be a clear lack of knowledge on the extent and mechanisms behind SOC erosion in seagrass meadows and we highlight the need for research to (1) define spatial and temporal scales of occurrence; (2) assess the influence of belowground biomass degradation, sediment characteristics, and hydrodynamic exposure on sediment stabilization; and (3) estimate the greenhouse gas emission after a disturbance. Such information would help coastal resource managers to address the causes and effects of SOC loss and sediment erosion when evaluating impacts of global change on coastal ecosystems.
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8.
  • Dahl, Martin, 1984-, et al. (creator_code:aut_t)
  • Impacts of land-use change and urban development on carbon sequestration in tropical seagrass meadow sediments
  • 2022
  • record:In_t: Marine Environmental Research. - : Elsevier BV. - 0141-1136 .- 1879-0291. ; 176
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Seagrass meadows store significant carbon stocks at a global scale, but land-use change and other anthropogenic activities can alter the natural process of organic carbon (Corg) accumulation. Here, we assessed the carbon accumulation history of two seagrass meadows in Zanzibar (Tanzania) that have experienced different degrees of disturbance. The meadow at Stone Town has been highly exposed to urban development during the 20th century, while the Mbweni meadow is located in an area with relatively low impacts but historical clearing of adjacent mangroves. The results showed that the two sites had similar sedimentary Corg accumulation rates (22–25 g m−2 yr−1) since the 1940s, while during the last two decades (∼1998 until 2018) they exhibited 24–30% higher accumulation of Corg, which was linked to shifts in Corg sources. The increase in the δ13C isotopic signature of sedimentary Corg (towards a higher seagrass contribution) at the Stone Town site since 1998 points to improved seagrass meadow conditions and Corg accumulation capacity of the meadow after the relocation of a major sewage outlet in the mid–1990s. In contrast, the decrease in the δ13C signatures of sedimentary Corg in the Mbweni meadow since the early 2010s was likely linked to increased Corg run-off of mangrove/terrestrial material following mangrove deforestation. This study exemplifies two different pathways by which land-based human activities can alter the carbon storage capacity of seagrass meadows (i.e. sewage waste management and mangrove deforestation) and showcases opportunities for management of vegetated coastal Corg sinks.
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9.
  • Dahlgren, Elin, et al. (creator_code:aut_t)
  • Trophic transfer of naturally produced brominated aromatic compounds in a Baltic Sea food chain
  • 2016
  • record:In_t: Chemosphere. - : Elsevier BV. - 0045-6535 .- 1879-1298. ; 144, s. 1597-1604
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Brominated aromatic compounds (BACs) are widely distributed in the marine environment. Some of these compounds are highly toxic, such as certain hydroxylated polybrominated diphenyl ethers (OH-PBDEs). In addition to anthropogenic emissions through use of BACs as e.g. flame retardants, BACs are natural products formed by marine organisms such as algae, sponges, and cyanobacteria. Little is known of the transfer of BACs from natural producers and further up in the trophic food chain. In this study it was observed that total sum of methoxylated polybrominated diphenyl ethers (MeO-PBDEs) and OH-PBDEs increased in concentration from the filamentous red alga Ceramium tenuicorne, via Gammarus sp. and three-spined stickleback (Gasterosteus aculeatus) to perch (Perca fluviatilis). The MeO-PBDEs, which were expected to bioaccumulate, increased in concentration accordingly up to perch, where the levels suddenly dropped dramatically. The opposite pattern was observed for OH-PBDEs, where the concentration exhibited a general trend of decline up the food web, but increased in perch, indicating metabolic demethylation of MeO-PBDEs. Debromination was also indicated to occur when progressing through the food chain resulting in high levels of tetra-brominated MeO-PBDE and OH-PBDE congeners in fish, while some penta- and hexa-brominated congeners were observed to be the dominant products in the alga. As it has been shown that OH-PBDEs are potent disruptors of oxidative phosphorylation and that mixtures of different congener may act synergistically in terms of this toxic mode of action, the high levels of OH-PBDEs detected in perch in this study warrants further investigation into potential effects of these compounds on Baltic wildlife, and monitoring of their levels.
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10.
  • Figueroa, Ricardo, et al. (creator_code:aut_t)
  • A transmembrane inner nuclear membrane protein in the mitotic spindle
  • 2010
  • record:In_t: Nucleus (Austin). - 1949-1042. ; 1:3, s. 249-253
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We have recently characterized a novel transmembrane protein of the inner nuclear membrane of mammalian cells. The protein has two very interesting features. First, despite being an integral membrane protein it is able to concentrate in the membranes colocalizing with the mitotic spindle in metaphase and anaphase. Hence, the protein was named Samp1, Spindle associated membrane protein 1. Secondly, it displays a functional connection to centrosomes. This article discusses various aspects of Samp1 in relation to possible cellular function(s).
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