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- Abariute, Laura, et al.
(author)
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Uptake of nanowires by human lung adenocarcinoma cells
- 2019
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In: PLoS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 14:6
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Journal article (peer-reviewed)abstract
- Semiconductor nanowires are increasingly used in optoelectronic devices. However, their effects on human health have not been assessed fully. Here, we investigate the effects of gallium phosphide nanowires on human lung adenocarcinoma cells. Four different geometries of nanowires were suspended in the cell culture for 48 hours. We show that cells internalize the nanowires and that the nanowires have no effect on cell proliferation rate, motility, viability and intracellular ROS levels. By blocking specific internalization pathways, we demonstrate that the nanowire uptake is the result of a combination of processes, requiring dynamin and actin polymerization, which suggests an internalization through macropinocytosis and phagocytosis.
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- Carlsson, Liesel
(author)
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Conceptualizing and Assessing Sustainable Food Systems and Diets: A Review
- 2020
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Other publication (other academic/artistic)abstract
- Objective: To synthesize research conceptualizing and measuring sustainable food systems (SFS) and diets and discusses the results from the perspective of supporting community level participation in global SFS. Design: Researchers conducted a narrative review of the literature, structured results into emergent categories and themes, and analyzed against known challenges to community level measurement. Results: Concepts defining SFS fall into the following broad approaches: visionary, multidimensional, resilience and parametres. Within these, common categories and emergent themes are reported. Assessment of SFS and diets can be grouped into three general approaches: multidimensional progress reporting, composite scores, and vulnerability assessments. Assessment is challenged by data gaps, especially at the community level, making community engagement in broader global goals elusive. Conclusions: Results contribute to SFS theory by suggesting a need to further develop existing parametres concepts, which set out system limits and principled approaches to governing those systems and show promise for assessment in the absence of adequate data. Future research directions might explore parametres approaches for supporting community level contributions to SFS in a way that demonstrates local-to-global alignment. These will be relevant to practitioners in nutrition, public health and community development, who are well-positioned to facilitate such work.
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- Kärkäs, Markus D., et al.
(author)
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Molecular ruthenium water oxidation catalysts carrying non-innocent ligands : mechanistic insight through structure-activity relationships and quantum chemical calculations
- 2016
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In: Catalysis Science & Technology. - : Royal Society of Chemistry (RSC). - 2044-4753 .- 2044-4761. ; 6:5, s. 1306-1319
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Journal article (peer-reviewed)abstract
- Robust catalysts that mediate H2O oxidation are of fundamental importance for the development of novel carbon-neutral energy technologies. Herein we report the synthesis of a group of single-site Ru complexes. Structure-activity studies revealed that the individual steps in the oxidation of H2O depended differently on the electronic properties of the introduced ligand substituents. The mechanistic details associated with these complexes were investigated experimentally along with quantum chemical calculations. It was found that O-O bond formation for the developed Ru complexes proceeds via high-valent Ru-VI species, where the capability of accessing this species is derived from the non-innocent ligand architecture. This cooperative catalytic involvement and the ability of accessing Ru-VI are intriguing and distinguish these Ru catalysts from a majority of previously reported complexes, and might generate unexplored reaction pathways for activation of small molecules such as H2O.
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- Sjöström, B, et al.
(author)
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The formation of submicron organic particles by precipitation in an emulsion
- 1994
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In: Journal of Dispersion Science and Technology. - 0193-2691 .- 1532-2351. ; 15, s. 89-117
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Journal article (peer-reviewed)abstract
- Submicron organic particles are produced by precipitation in an emulsion. The poorly water soluble organic substance is dissolved in a non-polar solvent. This solution is dispersed in an aqueous phase in the presence of emulsifier. When the non-polar solvent is removed by evaporation, the organic substance precipitates and one particle is formed in each emulsion droplet. Experimental work are here reported on the rate and the influence of the evaporation rate on the formation of cholesteryl acetate particles. An introductory theoretical analysis of the conditions experienced by each droplet during the evaporation is given. The experimental results suggest that the evaporation of the solvent is a rapid process mainly determined by the transport of the droplets to the vicinity of the air water interface. However, the results also show that the size of the particles formed by precipitation in the emulsion, is insensitive to the evaporation conditions, for instance if the evaporation is artificially slow. The particle size is mainly governed by the size of the emulsion droplets. The analysis discuss the possibility that during the evaporation of the emulsion, each individual droplet is emptied of its content of the non-polar solvent very rapidly. The hypothesis that each solid particle is formed during a very short period of time without obtaining a concentration equilibrium within the droplet is tested. However, the order-of-magnitude estimations do not support a kinetic explanation for the fact that the particles obtain the size of the emulsion droplets.
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