| 1. |
- Karlsson, Mattias, 1980, et al.
(författare)
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Micropipet-assisted formation of microscopic networks of unilamellar lipid bilayer nanotubes and containers
- 2001
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Ingår i: Langmuir. - : American Chemical Society (ACS). - 0743-7463 .- 1520-5827. ; 17:22, s. 6754-6758
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Tidskriftsartikel (refereegranskat)abstract
- We describe a novel micropipet-assisted technique for the construction of complex, surface-immobilized two-dimensional microscopic networks of unilamellar phospholipid bilayer vesicles (1-50 pm in diameter, 10(-15)-10(-12) L) interconnected by lipid nanotubes (100-300 nm in diameter). As starting material for the construction of networks, we used twinned vesicle pairs, one of which is multilamellar and functions as a membrane donor and the other unilamellar and functions as a membrane acceptor upon manipulation. By electromechanical insertion of a pipet tip into the unilamellar vesicle followed by lateral pulling of the micropipet away from the vesicle, a nanotube was formed. Buffer solution contained in the pipet was then injected into the nanotube orifice, forming a vesicle of controlled size that was immobilized on the surface. The networks have controlled connectivity and are well-defined with regard to the container size, angle between nanotube extensions, and nanotube length. The internal fluid composition of individual vesicles is defined during the formation of a network by selection of the solution contained in the micropipet.
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| 2. |
- Bergström, Ann-Kristin, et al.
(författare)
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Contrasting plankton stoichiometry and nutrient regeneration in northern arctic and boreal lakes
- 2018
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Ingår i: Aquatic Sciences. - : Springer. - 1015-1621 .- 1420-9055. ; 80:2
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Tidskriftsartikel (refereegranskat)abstract
- Contrasting carbon: nitrogen: phosphorus (C: N: P) stoichiometry between phytoplankton and zooplankton affect consumer growth and phytoplankton nutrient limitation via nutrient recycling by zooplankton. However, no study has assessed how regional differences in terrestrial loadings of organic matter affect plankton N: P stoichiometry and recycling in systems with low N deposition and N-limited phytoplankton. We address this question by using data from 14 unproductive headwater arctic and boreal lakes. We found that boreal lakes had higher lake water-and seston C, N and P concentrations than arctic lakes, whereas seston C: N, C: P and N: P ratios did not differ among regions. Boreal zooplankton were also richer in N and P relative to C, with lower somatic N: P ratios, compared to arctic lakes. Consequently, the estimated N: P imbalances between seston and zooplankton were negative in arctic lakes, indicating zooplankton feeding on phytoplankton of suboptimal N content, resulting in low consumer driven N: P recycling (medians arctic sub-mid and high altitude lakes: 11 and 13). In boreal lakes, estimated N: P imbalance did not differ from zero, with a seston N: P stoichiometry matching the N: P requirements of zooplankton, which resulted in higher consumer driven N: P recycling (median 18). Our results imply that regional climate induced catchment differences, through enhanced terrestrial nutrient inputs, affect plankton stoichiometry by raising consumer N: P recycling ratio and changing zooplankton from being mainly N-(arctic) to NP co-limited (boreal). Browning of lakes, in regions with low N deposition, may therefore promote large-scale regional changes in plankton nutrient limitation with potential feedbacks on pelagic food webs.
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| 3. |
- Bergström, Ann-Kristin, et al.
(författare)
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N-limited consumer growth and low nutrient regeneration N:P ratios in lakes with low N deposition
- 2015
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Ingår i: Ecosphere. - 2150-8925 .- 2150-8925. ; 6:1
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Tidskriftsartikel (refereegranskat)abstract
- Nutrient limitation of primary producers and their consumers can have a large influence on ecosystem productivity. The nature and strength of nutrient limitation is driven both by external factors (e.g., nutrient loading) and internal processes (e.g., consumer-driven nutrient regeneration). Here we present results from a field study in 10 low productive headwater lakes in northern subarctic Sweden, where nitrogen (N) deposition is low and phytoplankton is primarily N-limited. We assessed the carbon:nitrogen:phosphorus (C:N:P) stoichiometry of seston and zooplankton and estimated the N:P ratio of consumer-driven nutrient regeneration. Based on stoichiometric models, the estimated elemental imbalances between seston and zooplankton suggest that zooplankton were mainly N-limited and regenerated nutrients with low N:P ratios (median 11.9, atomic ratio). The predicted N:P regeneration ratios were consistent with results from phytoplankton nutrient limitation bioassays in mid-summer, i.e., the N:P regeneration was predicted to be low when phytoplankton were N-limited, and high when phytoplankton were P-limited. During other seasons, when water discharge was high, nutrient loading from the surrounding catchments apparently had the strongest effect on phytoplankton nutrient limitation. We propose that lakes with higher N:P ratios than the open ocean is an effect of N deposition, that N-limitation of consumers and phytoplankton is further enhanced by low nutrient regeneration N:P ratios, and that in the absence of N deposition, lake and ocean N:P stoichiometry are similar.
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| 4. |
- Bergström, Ann-Kristin, et al.
(författare)
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Nitrogen deposition and warming – effects on phytoplankton nutrient limitation in subarctic lakes
- 2013
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Ingår i: Global Change Biology. - Hoboken, NJ : Wiley-Blackwell. - 1354-1013 .- 1365-2486. ; 19:8, s. 2557-2568
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to predict the combined effects of enhanced nitrogen (N) deposition and warming on phytoplankton development in high latitude and mountain lakes. Consequently, we assessed, in a series of enclosureexperiments, how lake water nutrient stoichiometry and phytoplankton nutrient limitation varied over the growingseason in 11 lakes situated along an altitudinal/climate gradient with low N-deposition (<1 kg N ha1yr1) in northern subarctic Sweden. Short-term bioassay experiments with N- and P-additions revealed that phytoplankton inhigh-alpine lakes were more prone to P-limitation, and with decreasing altitude became increasingly N- andNP-colimited. Nutrient limitation was additionally most obvious in midsummer. There was also a strong positivecorrelation between phytoplankton growth and water temperature in the bioassays. Although excess nutrients wereavailable in spring and autumn, on these occasions growth was likely constrained by low water temperatures. Theseresults imply that enhanced N-deposition over the Swedish mountain areas will, with the exception of high-alpinelakes, enhance biomass and drive phytoplankton from N- to P-limitation. However, if not accompanied by warming,N-input from deposition will stimulate limited phytoplankton growth due to low water temperatures during largeparts of the growing season. Direct effects of warming, allowing increased metabolic rates and an extension of thegrowing season, seem equally crucial to synergistically enhance phytoplankton development in these lakes.
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| 5. |
- Abelsson, Tobias, et al.
(författare)
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A Feeling of Ambiguity: A Qualitative Content Analysis of Managers’ Experiences of Evidence-Based Practice in Swedish Primary Care
- 2022
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Ingår i: Journal of Healthcare Leadership. - 1179-3201. ; 14, s. 143-153
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Tidskriftsartikel (refereegranskat)abstract
- Background: The Primary care manager plays a vital role in promoting a research culture in the healthcare center. The position involves both the implementation of organizational directives and patient care. The research culture and use of evidence influence each individual healthcare professional and ultimately the quality of patient care. Purpose: To describe primary healthcare managers’ understanding of evidence-based practice in the Swedish primary healthcare context and their ability to influence its implementation. Methodology: Qualitative content analysis of data collected in individual interviews. Results: In general, managers expressed a positive view toward the use of evidence in daily practice. However, they were sometimes hesitant about fully implementing evidence-based results. This was mostly attributed to the struggle of balancing finances and allocating sufficient time for staff to keep up with and engage in evidence-based practice. Conclusion: The organizational culture impacts the mind-set of all co-workers including managers. Those managers influenced by traditions and norms may fall into the trap of devaluing the benefit of research and evidence. The inherent feeling of being alone and without guidance in some matters related to evidence-based practice inevitably leads to inconsistency and ambiguity. The use of clinical pathways that constitute one form of evidence has become a substitute for proper, careful, individual investigation, implementation, and evaluation of each patient case. This means that managers experience moral and physical stress when trying to meet organizational, staff, and patient demands. Practice Implication: Awareness of managers’ influence and experience of working according to evidence-based practice is valuable to gain an insight into how Swedish primary healthcare functions at local level. Illuminating and discussing evidence-based practice is an assurance of quality that contributes to many aspects of the overall safety of care. © 2022 Abelsson et al.
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| 6. |
- Abelsson, Tobias, et al.
(författare)
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Quality and availability of information in primary healthcare: the patient perspective
- 2020
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Ingår i: Scandinavian Journal of Primary Health Care. - : Informa UK Limited. - 0281-3432 .- 1502-7724. ; 38:1, s. 33-41
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To explore lived experiences of patients communicating with and receiving information from primary health care. Design: Qualitative study analysing transcribed interviews by descriptive content analysis. Setting: Recruitment and interviews took place in southern Sweden in three primary care centres where privacy and undisturbed interview environments was ensured. Subjects: 17 primary care patient informants, 9 men and 8 women aged 31 - 84 years with varying educational levels from primary school to post graduates. Main outcome measures: Thematic categories and subcategories reporting the lived experience of the patients. Results: The analysis yielded three categories and identified as a main theme a feeling of unpredictability based on the emotional aspects of feeling lost and vulnerable when trying to access primary care. The category" Need for easy access" illustrated emotional aspects of importance to patients when contacting primary health care." Need for individual adaptation" described the need to individually adapt health related information." Information exchange" comprised experiences of information evaluation and understanding new information. Conclusions: Patients generally trusted the information received, but experienced a lack of communication, which evoked feelings of unpredictability and abandonment. Experiences of limited access to primary health care and the need for varying degrees of adaptation on the part of the individual were factors of concern for how patients experienced the care.
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| 7. |
- Abelsson, Tobias, et al.
(författare)
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The dilemma of the split between theory and reality as experienced by primary healthcare professionals: a mixed methods study of evidence-based practice in a primary care context
- 2024
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Ingår i: BMC PRIMARY CARE. - 2731-4553. ; 25:1
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Tidskriftsartikel (refereegranskat)abstract
- BackgroundPrimary care depends upon a good information flow across professional and structural boundaries to provide the best care for patients. Previous research has mainly focused on Evidence-Based Practice (EBP) within specific professions. Mapping of pan-professional experiences of and attitudes to EBP in publicly funded clinical practice is necessary to deepen the understanding of EBP and its implementation. Thus, this study aimed to investigate healthcare professionals' experiences of and attitudes towards working in accordance with EBP in primary care.MethodsThe study used a convergent mixed methods design divided into two strands: a quantitative enquiry tool (Evidence-Based Practice Attitude Scale, EBPAS) and a set of qualitative interviews analysed by means of qualitative content analysis. Both strands included all primary care employees with patient interaction in the studied county (n = 625), including doctors, nurses, physiotherapists, psychologists and assistant nurses. Out of the original 625 healthcare professionals, 191 finished the first strand and 8 volunteered for the second strand (2 nurses, 2 physiotherapists, 1 psychiatrist and 3 doctors).ResultsThe EBPAS value of 2.8 (max 4) indicated a generally positive attitude towards EBP amongst the population, which was also evident in the interviews. However, there were additional experiences of not having the ability or resources to engage in EBP. This was illustrated by the theme that emerged from the qualitative content analysis: "The dilemma of the split between theory and reality". Due to the organisational and managerial focus on efficiency rather than quality of care, there were few or no incentives for promoting individual educational or research development.ConclusionsAlthough the general attitude towards EBP is positive, experiences of practising it differ. There is a need to increase knowledge of EBP concepts, requirements and implementation in the clinical setting. The absence of opportunities to do research and collegial debate about new ways of finding and implementing research-based evidence results might influence the quality of care.
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| 8. |
- Adman, Per, et al.
(författare)
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171 forskare: ”Vi vuxna bör också klimatprotestera”
- 2019
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Ingår i: Dagens nyheter (DN debatt). - Stockholm. - 1101-2447.
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- DN DEBATT 26/9. Vuxna bör följa uppmaningen från ungdomarna i Fridays for future-rörelsen och protestera eftersom det politiska ledarskapet är otillräckligt. Omfattande och långvariga påtryckningar från hela samhället behövs för att få de politiskt ansvariga att utöva det ledarskap som klimatkrisen kräver, skriver 171 forskare i samhällsvetenskap och humaniora.
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| 9. |
- Al-kharusi, Enass Said., et al.
(författare)
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Large-Scale Retrieval of Coloured Dissolved Organic Matter in Northern Lakes Using Sentinel-2 Data
- 2020
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Ingår i: Remote Sensing. - : MDPI AG. - 2072-4292. ; 12:1, s. 157-157
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Tidskriftsartikel (refereegranskat)abstract
- Owing to the significant societal value of inland water resources, there is a need for cost-effective monitoring of water quality on large scales. We tested the suitability of the recently launched Sentinel-2A to monitor a key water quality parameter, coloured dissolved organic matter (CDOM), in various types of lakes in northern Sweden. Values of a(420)CDOM (CDOM absorption at 420 nm wavelength) were obtained by analyzing water samples from 46 lakes in five districts across Sweden within an area of approximately 800 km2. We evaluated the relationships between a(420)CDOM and band ratios derived from Sentinel-2A Level-1C and Level-2A products. The band ratios B2/B3 (460 nm/560 nm) and B3/B5 (560 nm/705 nm) showed poor relationships with a(420)CDOM in Level-1C and 2A data both before and after the removal of outliers. However, there was a slightly stronger power relationship between the atmospherically-corrected B3/B4 ratio and a(420)CDOM (R2 = 0.28, n = 46), and this relationship was further improved (R2 = 0.65, n = 41) by removing observations affected by light haze and cirrus clouds. This study covered a wide range of lakes in different landscape settings and demonstrates the broad applicability of a(420)CDOM retrieval algorithms based on the B3/B4 ratio derived from Sentinel-2A. View Full-Text
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| 10. |
- Backman, Ellen, MSc, 1981-, et al.
(författare)
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Children's perspectives on mealtimes when living with a gastrostomy tube : A qualitative study
- 2021
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Ingår i: Journal of Pediatric Nursing. - Philadelphia, PA : Elsevier. - 0882-5963 .- 1532-8449. ; 58, s. 53-59
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: To explore children's experiences of mealtimes when living with a gastrostomy tube.Design and methods: The study used a qualitative descriptive design framed within ecocultural theory. Seven children, three girls and four boys, aged 6–12 years with long-term health conditions and a gastrostomy tube participated in individual interviews. The interviews were qualitatively analysed by means of systematic text condensation.Results: Four main categories comprised the findings of the children's mealtimes experiences: “Stable in form, open to variation,” “An individual, and a shared activity,” “An object that needs to be dealt with” and “A part of me.” A complex picture emerged, where the children experienced nutrition, whether through the gastrostomy tube or orally, as necessary for a healthy body, although this did not suffice to make the mealtime experience positive.Conclusions: Regardless of the children's amount of oral intake, everyday mealtimes were valued as opportunities for social interaction and experienced as a predictable, routine activity no different from the mealtimes of other families. The accounts illustrated that in many situations the children knew precisely what they needed and did not need, what they liked and disliked and why.Practice implications: Healthcare professionals should take children's knowledge into consideration to a greater extent when planning follow-up and intervention. The study illuminates that children can take an active part in their healthcare when offered flexible and carefully designed communication material, even in the presence of communicative and/or intellectual disability. © 2020 The Author(s).
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