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- Benitez, Almudena, et al.
(författare)
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A renaissance for lithium-sulfur batteries through low-cost, efficient, and sustainable biomass cathodes
- 2022
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Ingår i: One Earth. - : Elsevier. - 2590-3330 .- 2590-3322. ; 5:3, s. 224-226
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Although lithium-ion batteries face material sustainability issues, one promising alternative-lithium-sulfur (Li-S) batteries-suffers from destructive chemical reactions. Recently in Chem, Hou et al. proposed one viable solution: an encapsulating lithium polysulfide electrolyte. We discuss this advance and the potential role of biomass as an alternative sustainable material for Li-S battery cathodes.
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- Clarholm, Marianne
(författare)
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Stimulation of Plant Growth through Interactions of Bacteria and Protozoa: Testing the Auxiliary Microbial Loop Hypothesis
- 2012
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Ingår i: Acta Protozoologica. - 0065-1583 .- 1689-0027. ; 51, s. 237-247
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Forskningsöversikt (refereegranskat)abstract
- By feeding on bacterial biomass protozoa play an acknowledged role in the liberation of nutrients in the plant rhizosphere. In addition there are suggestions that plants have mechanisms working through changes in root architecture and initiation of active release from soil organic matter, which are used to improve uptake and recirculation of nutrients in the ecosystem. All processes are carried out on a local scale in soil with roots, bacteria and protozoa interacting. The many actors and the small scale of interactions make experimentation difficult. We discuss mistakes, pitfalls and misinterpretations and provide suggestions for improvement. Recent methodological progress has opened new exciting avenues for protozoan research. New techniques have already helped to reveal protozoan regulation of cooperation as well as conflict in bacterial communities. These mechanisms in turn affect bacterial functioning and target molecular control points in rhizosphere food webs in relation to plants. Integrating nutritional and regulatory aspects into new concepts of protozoan functioning in soil is a challenging frontier in protozoology.
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- Johannesson, Karin, 1970-
(författare)
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Drömmen om en alba som passar
- 1996
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Ingår i: Vår lösen : ekumenisk kulturtidskrift. - 0346-4679. ; , s. 604-605
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- Om Svenska kyrkans potientiella trångsynthet.
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- Johannesson, Kerstin, 1955, et al.
(författare)
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What explains rare and conspicuous colours in a snail? A test of time-series data against models of drift, migration or selection
- 2017
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Ingår i: Heredity. - : Springer Science and Business Media LLC. - 0018-067X .- 1365-2540. ; 118:1, s. 21-30
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Tidskriftsartikel (refereegranskat)abstract
- It is intriguing that conspicuous colour morphs of a prey species may be maintained at low frequencies alongside cryptic morphs. Negative frequency-dependent selection by predators using search images ('apostatic selection') is often suggested without rejecting alternative explanations. Using a maximum likelihood approach we fitted predictions from models of genetic drift, migration, constant selection, heterozygote advantage or negative frequency-dependent selection to time-series data of colour frequencies in isolated populations of a marine snail (Littorina saxatilis), re-established with perturbed colour morph frequencies and followed for >20 generations. Snails of conspicuous colours (white, red, banded) are naturally rare in the study area (usually <10%) but frequencies were manipulated to levels of ~50% (one colour per population) in 8 populations at the start of the experiment in 1992. In 2013, frequencies had declined to ~15-45%. Drift alone could not explain these changes. Migration could not be rejected in any population, but required rates much higher than those recorded. Directional selection was rejected in three populations in favour of balancing selection. Heterozygote advantage and negative frequency-dependent selection could not be distinguished statistically, although overall the results favoured the latter. Populations varied idiosyncratically as mild or variable colour selection (3-11%) interacted with demographic stochasticity, and the overall conclusion was that multiple mechanisms may contribute to maintaining the polymorphisms.
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- Khalaim, Oleksandra, 1984-
(författare)
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Agenda 2030 Implementation in the Eastern Partnership : The state of SDG localization in Belarus, Georgia and Ukraine
- 2021
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Rapport (populärvet., debatt m.m.)abstract
- The desk study “Localizing Sustainable Development Goals in the EAPCountries” includes three country mappings of relevant stakeholders, challenges and needs, and the overall state of SDG implementation in Belarus, Ukraine, and Georgia. The study provides a basic overview of how these countries are working to implement the UN 2030 Agenda with a particular focus on the state of regional and local implementation of the SDGs (localizing SDGs). The desk study is made for the Global Utmaning and funded by the Swedish Insitute.
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- Lindberg, Lachmi E, et al.
(författare)
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c-erbB2-induced disruption of matrix adhesion and morphogenesis reveals a novel role for protein kinase B as a negative regulator of alpha(2)beta(1) integrin function.
- 2002
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Ingår i: Molecular biology of the cell. - 1059-1524. ; 13:8, s. 2894-908
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Tidskriftsartikel (refereegranskat)abstract
- Overexpression of the growth factor receptor subunit c-erbB2, leading to its ligand-independent homodimerization and activation, has been implicated in the pathogenesis of mammary carcinoma. Here, we have examined the effects of c-erbB2 on the adhesive properties of a mammary epithelial cell line, HB2/tnz34, in which c-erbB2 homodimerization can be induced by means of a transfected hybrid "trk-neu" construct. trk-neu consists of the extracellular domain of the trkA nerve growth factor (NGF) receptor fused to the transmembrane and cytoplasmic domains of c-erbB2, allowing NGF-induced c-erbB2 homodimer signaling. Both spreading and adhesion on collagen surfaces were impaired on c-erbB2 activation in HB2/tnz34 cells. Antibody-mediated stimulation of alpha(2)beta(1) integrin function restored adhesion, suggesting a direct role for c-erbB2 in integrin inactivation. Using pharmacological inhibitors and transient transfections, we identified signaling pathways required for suppression of integrin function by c-erbB2. Among these was the MEK-ERK pathway, previously implicated in integrin inactivation. However, we could also show that downstream of phosphoinositide-3-kinase (PI3K), protein kinase B (PKB) acted as a previously unknown, potent inhibitor of integrin function and mediator of the disruptive effects of c-erbB2 on adhesion and morphogenesis. The integrin-linked kinase, previously identified as a PKB coactivator, was also found to be required for integrin inactivation by c-erbB2. In addition, the PI3K-dependent mTOR/S6 kinase pathway was shown to mediate c-erbB2-induced inhibition of adhesion (but not spreading) independently of PKB. Overexpression of MEK1 or PKB suppressed adhesion without requirement for c-erbB2 activation, suggesting that these two pathways partake in integrin inhibition by targeting common downstream effectors. These results demonstrate a major novel role for PI3K and PKB in regulation of integrin function.
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