| 1. |
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| 2. |
- Munch, Marie W., et al.
(författare)
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Effect of 12 mg vs 6 mg of Dexamethasone on the Number of Days Alive Without Life Support in Adults With COVID-19 and Severe Hypoxemia The COVID STEROID 2 Randomized Trial
- 2021
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Ingår i: Journal of the American Medical Association (JAMA). - : AMER MEDICAL ASSOC. - 0098-7484 .- 1538-3598. ; 326:18, s. 1807-1817
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Tidskriftsartikel (refereegranskat)abstract
- Question What is the effect of 12 mg vs 6 mg of dexamethasone on the number of days alive without life support at 28 days in patients with COVID-19 and severe hypoxemia? Findings In this randomized trial that included 1000 patients with COVID-19 and severe hypoxemia, treatment with 12 mg/d of dexamethasone resulted in 22.0 days alive without life support at 28 days compared with 20.5 days in those receiving 6 mg/d of dexamethasone. This difference was not statistically significant. Meaning Compared with 6 mg of dexamethasone, 12 mg of dexamethasone did not statistically significantly reduce the number of days alive without life support at 28 days. This multicenter randomized clinical trial compares the effects of 12 mg/d vs 6 mg/d of dexamethasone in patients with COVID-19 and severe hypoxemia. IMPORTANCE A daily dose with 6 mg of dexamethasone is recommended for up to 10 days in patients with severe and critical COVID-19, but a higher dose may benefit those with more severe disease. OBJECTIVE To assess the effects of 12 mg/d vs 6 mg/d of dexamethasone in patients with COVID-19 and severe hypoxemia. DESIGN, SETTING, AND PARTICIPANTS A multicenter, randomized clinical trial was conducted between August 2020 and May 2021 at 26 hospitals in Europe and India and included 1000 adults with confirmed COVID-19 requiring at least 10 L/min of oxygen or mechanical ventilation. End of 90-day follow-up was on August 19, 2021. INTERVENTIONS Patients were randomized 1:1 to 12 mg/d of intravenous dexamethasone (n = 503) or 6 mg/d of intravenous dexamethasone (n = 497) for up to 10 days. MAIN OUTCOMES AND MEASURES The primary outcome was the number of days alive without life support (invasive mechanical ventilation, circulatory support, or kidney replacement therapy) at 28 days and was adjusted for stratification variables. Of the 8 prespecified secondary outcomes, 5 are included in this analysis (the number of days alive without life support at 90 days, the number of days alive out of the hospital at 90 days, mortality at 28 days and at 90 days, and >= 1 serious adverse reactions at 28 days). RESULTS Of the 1000 randomized patients, 982 were included (median age, 65 [IQR, 55-73] years; 305 [31%] women) and primary outcome data were available for 971 (491 in the 12 mg of dexamethasone group and 480 in the 6 mg of dexamethasone group). The median number of days alive without life support was 22.0 days (IQR, 6.0-28.0 days) in the 12 mg of dexamethasone group and 20.5 days (IQR, 4.0-28.0 days) in the 6 mg of dexamethasone group (adjusted mean difference, 1.3 days [95% CI, 0-2.6 days]; P = .07). Mortality at 28 days was 27.1% in the 12 mg of dexamethasone group vs 32.3% in the 6 mg of dexamethasone group (adjusted relative risk, 0.86 [99% CI, 0.68-1.08]). Mortality at 90 days was 32.0% in the 12 mg of dexamethasone group vs 37.7% in the 6 mg of dexamethasone group (adjusted relative risk, 0.87 [99% CI, 0.70-1.07]). Serious adverse reactions, including septic shock and invasive fungal infections, occurred in 11.3% in the 12 mg of dexamethasone group vs 13.4% in the 6 mg of dexamethasone group (adjusted relative risk, 0.83 [99% CI, 0.54-1.29]). CONCLUSIONS AND RELEVANCE Among patients with COVID-19 and severe hypoxemia, 12 mg/d of dexamethasone compared with 6 mg/d of dexamethasone did not result in statistically significantly more days alive without life support at 28 days. However, the trial may have been underpowered to identify a significant difference.
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| 3. |
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| 4. |
- Riggi, Laura, et al.
(författare)
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Early-season mass-flowering crop cover dilutes wild bee abundance and species richness in temperate regions : A quantitative synthesis
- 2024
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Ingår i: Journal of Applied Ecology. - 0021-8901 .- 1365-2664. ; 61:3, s. 452-464
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Tidskriftsartikel (refereegranskat)abstract
- Pollinators benefit from increasing floral resources in agricultural landscapes, which could be an underexplored co-benefit of mass-flowering crop cultivation. However, the impacts of mass-flowering crops on pollinator communities are complex and appear to be context-dependent, mediated by factors such as crop flowering time and the availability of other flower resources in the landscape. A synthesis of research is needed to develop management recommendations for effective pollinator conservation in agroecosystems. By combining 22 datasets from 13 publications conducted in nine temperate countries (20 European, 2 North American), we investigated if mass-flowering crop flowering time (early or late season), bloom state (during or after crop flowering) and extent of non-crop habitat cover in the landscape moderated the effect of mass-flowering crop cover on wild pollinator abundance and species richness in mass-flowering crop and non-crop habitats. During bloom, wild bee abundance and richness are negatively related to mass-flowering crop cover. Dilution effects were predominant in crop habitats and early in the season, except for bumblebees, which declined with mass-flowering crop cover irrespective of habitat or season. Late in the season and in non-crop habitats, several of these negative relationships were either absent or reversed. Late-season mass-flowering crop cover is positively related to honeybee abundance in crop habitats and to other bee abundance in non-crop habitats. These results indicate that crop-adapted species, like honeybees, move to forage and concentrate on late-season mass-flowering crops at a time when flower availability in the landscape is limited, potentially alleviating competition for flower resources in non-crop habitats. We found no evidence of pollinators moving from mass-flowering crop to non-crop habitats after crop bloom. Synthesis and applications: Our results confirm that increasing early-season mass-flowering crop cover dilutes wild pollinators in crop habitats during bloom. We find that dilution effects were absent late in the season. While mass-flowering crop cultivation alone is unlikely to be sufficient for maintaining pollinators, as part of carefully designed diverse crop rotations or mixtures combined with the preservation of permanent non-crop habitats, it might provide valuable supplementary food resources for pollinators in temperate agroecosystems, particularly later in the season when alternative flower resources are scarce.
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| 5. |
- Al Khatib, O, et al.
(författare)
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Workplace Violence against Health Care Providers in Emergency Departments of Public Hospitals in Jordan: A Cross-Sectional Study
- 2023
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Ingår i: International journal of environmental research and public health. - : MDPI AG. - 1660-4601. ; 20:4
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Tidskriftsartikel (refereegranskat)abstract
- Workplace violence (WPV) against healthcare providers is a serious problem that carries health, safety, and legal consequences. Healthcare providers working in emergency departments (ED) are more susceptible to WPV compared to other healthcare settings. This study aimed to assess the prevalence of physical and verbal violence against ED physicians and nurses in public hospitals in Amman, Jordan, and to explore the relationship between WPV and the socio-demographic characteristics of the participants. A quantitative descriptive cross-sectional study design was used to assess physical and verbal violence against ED physicians and nurses. A self-administered questionnaire was completed by 67 physicians and 96 nurses from three public hospitals in Amman. In the past year, 33% and 53% of the participants experienced physical and verbal violence, respectively. Compared to their female counterparts, males were more frequently physically (43.7% vs. 2.3%, p-value < 0.001) and verbally (61.3% vs. 29.5%, p-value < 0.001) abused. The main perpetrators of physical and verbal violence were the patients’ relatives. Out of 53 physical and 86 verbal abuse incidents, only 15 cases (10.8%) were followed up with legal persecution. In conclusion, there is a widespread occurrence of physical and verbal violence against ED physicians and nurses in the public sector hospitals in Jordan. A collaborative effort by all stakeholders should be instituted to ensure the safety of the physicians and nurses and to improve the quality of the healthcare provided.
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| 6. |
- Alenius Dahlqvist, Jenny, 1972-, et al.
(författare)
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Changes in Heart Rate and Heart Rate Variability During Surgical Stages to Completed Fontan Circulation
- 2021
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Ingår i: Pediatric Cardiology. - : Springer Science and Business Media LLC. - 0172-0643 .- 1432-1971. ; 42:5, s. 1162-1169
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Tidskriftsartikel (refereegranskat)abstract
- Arrhythmia is related to heart rate variability (HRV), which reflects the autonomic nervous regulation of the heart. We hypothesized that autonomic nervous ganglia, located at the junction of the superior vena cava's entrance to the heart, may be affected during the bidirectional Glenn procedure (BDG), resulting in reduced HRV. We aimed to investigate changes in heart rate and HRV in a cohort of children with univentricular heart defects, undergoing stepwise surgery towards total cavopulmonary connection (TCPC), and compare these results with healthy controls. Twenty four hours Holter-ECG recordings were obtained before BDG (n = 47), after BDG (n = 47), and after total cavopulmonary connection (TCPC) (n = 45) in patients and in 38 healthy controls. HRV was analyzed by spectral and Poincare methods. Age-related z scores were calculated and compared using linear mixed effects modeling. Total HRV was significantly lower in patients before BDG when compared to healthy controls. The mean heart rate was significantly reduced in patients after BDG compared to before BDG. Compared to healthy controls, patients operated with BDG had significantly reduced heart rate and reduced total HRV. Patients with TCPC showed reduced heart rate and HRV compared with healthy controls. In patients after TCPC, total HRV was decreased compared to before TCPC. Heart rate was reduced after BDG procedure, and further reductions of HRV were seen post-TCPC. Our results indicate that autonomic regulation of cardiac rhythm is affected both after BDG and again after TCPC. This may be reflected as, and contribute to, postoperative arrhythmic events.
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| 7. |
- Bokhari, Ahmad H., 1986-, et al.
(författare)
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Loudspeaker cabinet design by topology optimization
- 2023
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Ingår i: Scientific Reports. - : Nature Publishing Group. - 2045-2322. ; 13:1
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Tidskriftsartikel (refereegranskat)abstract
- Using material distribution-based topology optimization, we optimize the bandpass design of a loudspeaker cabinet targeting low frequencies. The objective is to maximize the loudspeaker’s output power for a single frequency as well as a range of frequencies. To model the loudspeaker’s performance, we combine a linear electromechanical transducer model with a computationally efficient hybrid 2D–3D model for sound propagation. The adjoint variable approach computes the gradients of the objective function with respect to the design variables, and the Method of Moving Asymptotes (MMA) solves the topology optimization problem. To manage intermediate values of the material indicator function, a quadratic penalty is added to the objective function, and a non-linear filter is used to obtain a mesh independent design. By carefully selecting the target frequency range, we can guide the optimization algorithm to successfully generate a loudspeaker design with the required bandpass character. To the best of our knowledge, this study constitutes the first successful attempt to design the interior structure of a loudspeaker cabinet using topology optimization.
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| 8. |
- Datta-Chaudhuri, Timir, et al.
(författare)
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The Fourth Bioelectronic Medicine Summit "Technology Targeting Molecular Mechanisms" : current progress, challenges, and charting the future
- 2021
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Ingår i: Bioelectronic medicine. - : BioMed Central. - 2332-8886. ; 7:1
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- There is a broad and growing interest in Bioelectronic Medicine, a dynamic field that continues to generate new approaches in disease treatment. The fourth bioelectronic medicine summit "Technology targeting molecular mechanisms" took place on September 23 and 24, 2020. This virtual meeting was hosted by the Feinstein Institutes for Medical Research, Northwell Health. The summit called international attention to Bioelectronic Medicine as a platform for new developments in science, technology, and healthcare. The meeting was an arena for exchanging new ideas and seeding potential collaborations involving teams in academia and industry. The summit provided a forum for leaders in the field to discuss current progress, challenges, and future developments in Bioelectronic Medicine. The main topics discussed at the summit are outlined here.
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| 9. |
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| 10. |
- Engström, Rickard, 1972-
(författare)
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Den oberoende mellanmannen : En studie av fastighetsmäklarprofessionen och begreppet ”god fastighetsmäklarsed” i teori och praktik
- 2022
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Den svenska fastighetsmäklaren intar en roll som oberoende mellanman medomsorgsplikt mot både köpare och säljare, vilket skiljer sig från hurfastighetsmäklaryrket är organiserat på de flesta andra håll i världen. Därav är densvenska modellen värd att studera och analysera. I Sverige regleras yrket i lag.Utövarnas regelefterlevnad kontrolleras av Fastighetsmäklarinspektionen (FMI). Ettviktigt begrepp är ”god fastighetsmäklarsed”. Vad som bedöms vara ”godfastighetsmäklarsed” bestäms genom praxis från FMI och förvaltningsdomstolarna.En disciplinpåföljd från FMI kan bestå av erinran, varning eller återkallelse avregistrering, vilket medför ett yrkesförbud. En disciplinpåföljd kan överklagas tillförvaltningsdomstolarna.Denna avhandling består av en sammanhållande kappa och fyra artiklar sombeskriver fyra olika studier som gjorts för att bättre förstå förutsättningarna för deindivider som verkar som fastighetsmäklare på den svenska bostadsmarknaden. Detövergripande syftet är att beskriva och analysera fastighetsmäklares yrkesroll i ensvensk kontext och speciellt deras roll som oberoende mellanman. Med utgångspunkti tre forskningsfrågor används både kvalitativa och kvantitativa metoder för att samlain och analysera primära och sekundära data. Resultaten visar att verksamma svenskafastighetsmäklare balanserar de utmaningar som kan rymmas inom rollen somoberoende mellanman, men det finns också vissa gränsdragningsproblem avseende”god fastighetsmäklarsed”.FMI utdelar disciplinpåföljder till fastighetsmäklare vid regelöverträdelser. Att ivardagen förhålla sig till regelverk och praxis är svårare för vissa kategorierfastighetsmäklare: yngre fastighetsmäklare får oftare än äldre påföljden erinran, äldrefår oftare än yngre påföljden varning, och fastighetsmäklare verksamma i storstad fåroftare påföljden varning jämfört med fastighetsmäklare på landsbygden.Fastighetsmäklaryrket och professionsutvecklingen studeras i en jämförande studiemellan Australien (Victoria) och Sverige. De svenska branschorganisationerna –Mäklarsamfundet och Fastighetsmäklarförbundet (FMF) – är delaktiga i professionsutvecklingen,bland annat som huvudmän för Fastighetsmarknadens Reklamationsnämnd(FRN) som agerar enligt lagen (2015:671) om alternativ tvistlösning ikonsumentförhållanden. Avhandlingen ger vidare förslag till utveckling av såvälytterligare forskning som av praktiken.
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| 11. |
- Fritze, Stefan, et al.
(författare)
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Elemental distribution and fracture properties of magnetron sputtered carbon supersaturated tungsten films
- 2024
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Ingår i: Surface & Coatings Technology. - : Elsevier BV. - 0257-8972 .- 1879-3347. ; 477
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Tidskriftsartikel (refereegranskat)abstract
- The combination of strength and toughness is a major driving force for alloy design of protective coatings, and nanocrystalline tungsten (W)-alloys have shown to be promising candidates for combining strength and toughness. Here we investigate the elemental distribution and the fracture toughness of carbon (C) alloyed W thin films prepared by non-reactive magnetron sputtering. W:C films with up to ~4 at.% C crystallize in a body-centered-cubic structure with a strong 〈hh0〉texture, and no additional carbide phases are observed in the diffraction pattern. Atom probe tomography and X-ray photoelectron spectroscopy confirmed the formation of such a supersaturated solid solution. The pure W film has a hardness ~13 GPa and the W:C films exhibit a peak hardness of ~24 GPa. In-situ micromechanical cantilever bending tests show that the fracture toughness decreases from ~4.5 MPa·m1/2 for the W film to ~3.1 MPa·m1/2 for W:C films. The results show that C can significantly enhance the hardness of W thin films while retaining a high fracture toughness.
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| 12. |
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| 13. |
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| 14. |
- Gerasimov, Jennifer Yevgenia, 1985-, et al.
(författare)
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Rational Materials Design for In Operando Electropolymerization of Evolvable Organic Electrochemical Transistors
- 2022
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Ingår i: Advanced Functional Materials. - : John Wiley and Sons Inc. - 1616-301X .- 1616-3028. ; 32
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Tidskriftsartikel (refereegranskat)abstract
- Organic electrochemical transistors formed by in operando electropolymerization of the semiconducting channel are increasingly becoming recognized as a simple and effective implementation of synapses in neuromorphic hardware. However, very few studies have reported the requirements that must be met to ensure that the polymer spreads along the substrate to form a functional conducting channel. The nature of the interface between the substrate and various monomer precursors of conducting polymers through molecular dynamics simulations is investigated, showing that monomer adsorption to the substrate produces an increase in the effective monomer concentration at the surface. By evaluating combinatorial couples of monomers baring various sidechains with differently functionalized substrates, it is shown that the interactions between the substrate and the monomer precursor control the lateral growth of a polymer film along an inert substrate. This effect has implications for fabricating synaptic systems on inexpensive, flexible substrates. © 2022 The Authors.
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| 15. |
- Grankvist, R, et al.
(författare)
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Myocardial micro-biopsy procedure for molecular characterization with increased precision and reduced trauma
- 2020
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Ingår i: Scientific reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 10:1, s. 8029-
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Tidskriftsartikel (refereegranskat)abstract
- Endomyocardial biopsy is a valuable tool in cardiac diagnostics but is limited by low diagnostic yield and significant complication risks. Meanwhile, recent developments in transcriptomic and proteomic technologies promise a wealth of biological data from minimal tissue samples. To take advantage of the minimal tissue amount needed for molecular analyses, we have developed a sub-millimeter endovascular biopsy device, considerably smaller than current clinical equipment, and devised a low-input RNA-sequencing protocol for analyzing small tissue samples. In in vivo evaluation in swine, 81% of biopsy attempts (n = 157) were successful. High quality RNA-sequencing data was generated from 91% of the sequenced cardiac micro-biopsy samples (n = 32). Gene expression signatures of samples taken with the novel device were comparable with a conventional device. No major complications were detected either during procedures or during 7 days’ follow-up, despite acquiring a relatively large number of biopsies (median 30) in each animal. In conclusion, the novel device coupled with RNA-sequencing provides a feasible method to obtain molecular data from the myocardium. The method is less traumatic and has a higher flexibility compared to conventional methods, enabling safer and more targeted sampling from different parts of the myocardium.
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| 16. |
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| 17. |
- Hepworth, Jo, et al.
(författare)
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Natural variation in autumn expression is the major adaptive determinant distinguishing Arabidopsis FLC haplotypes
- 2020
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Ingår i: eLIFE. - 2050-084X. ; 9
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Tidskriftsartikel (refereegranskat)abstract
- In Arabidopsis thaliana, winter is registered during vernalization through the temperature-dependent repression and epigenetic silencing of floral repressor FLOWERING LOCUS C (FLC). Natural Arabidopsis accessions show considerable variation in vernalization. However, which aspect of the FLC repression mechanism is most important for adaptation to different environments is unclear. By analysing FLC dynamics in natural variants and mutants throughout winter in three field sites, we find that autumnal FLC expression, rather than epigenetic silencing, is the major variable conferred by the distinct Arabidopsis FLChaplotypes. This variation influences flowering responses of Arabidopsis accessions resulting in an interplay between promotion and delay of flowering in different climates to balance survival and, through a post-vernalization effect, reproductive output. These data reveal how expression variation through non-coding cis variation at FLC has enabled Arabidopsis accessions to adapt to different climatic conditions and year-on-year fluctuations.
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| 18. |
- Hepworth, Jo, et al.
(författare)
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Natural variation in autumn expression is the major adaptive determinant distinguishing arabidopsis flc haplotypes
- 2020
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Ingår i: eLife. - 2050-084X. ; 9
-
Tidskriftsartikel (refereegranskat)abstract
- In Arabidopsis thaliana, winter is registered during vernalization through the temperature-dependent repression and epigenetic silencing of floral repressor FLOWERING LOCUS C (FLC). Natural Arabidopsis accessions show considerable variation in vernalization. However, which aspect of the FLC repression mechanism is most important for adaptation to different environments is unclear. By analysing FLC dynamics in natural variants and mutants throughout winter in three field sites, we find that autumnal FLC expression, rather than epigenetic silencing, is the major variable conferred by the distinct Arabidopsis FLChaplotypes. This variation influences flowering responses of Arabidopsis accessions resulting in an interplay between promotion and delay of flowering in different climates to balance survival and, through a post-vernalization effect, reproductive output. These data reveal how expression variation through non-coding cis variation at FLC has enabled Arabidopsis accessions to adapt to different climatic conditions and year-on-year fluctuations.
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| 19. |
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| 20. |
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| 21. |
- Luo, Yifei, et al.
(författare)
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Technology Roadmap for Flexible Sensors
- 2023
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Ingår i: ACS Nano. - : American Chemical Society. - 1936-0851 .- 1936-086X. ; 17:6, s. 5211-5295
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Forskningsöversikt (refereegranskat)abstract
- Humans rely increasingly on sensors to address grand challenges and to improve quality of life in the era of digitalization and big data. For ubiquitous sensing, flexible sensors are developed to overcome the limitations of conventional rigid counterparts. Despite rapid advancement in bench-side research over the last decade, the market adoption of flexible sensors remains limited. To ease and to expedite their deployment, here, we identify bottlenecks hindering the maturation of flexible sensors and propose promising solutions. We first analyze challenges in achieving satisfactory sensing performance for real-world applications and then summarize issues in compatible sensor-biology interfaces, followed by brief discussions on powering and connecting sensor networks. Issues en route to commercialization and for sustainable growth of the sector are also analyzed, highlighting environmental concerns and emphasizing nontechnical issues such as business, regulatory, and ethical considerations. Additionally, we look at future intelligent flexible sensors. In proposing a comprehensive roadmap, we hope to steer research efforts towards common goals and to guide coordinated development strategies from disparate communities. Through such collaborative efforts, scientific breakthroughs can be made sooner and capitalized for the betterment of humanity.
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| 22. |
- Mousa, Abdelrazek H., et al.
(författare)
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Method Matters: Exploring Alkoxysulfonate-Functionalized Poly(3,4-ethylenedioxythiophene) and Its Unintentional Self-Aggregating Copolymer toward Injectable Bioelectronics
- 2022
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Ingår i: Chemistry of Materials. - : American Chemical Society (ACS). - 0897-4756 .- 1520-5002. ; 34:6, s. 2752-2763
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Tidskriftsartikel (refereegranskat)abstract
- Injectable bioelectronics could become an alternative or a complement to traditional drug treatments. To this end, a new self-doped p- type conducting PEDOT-S copolymer (A5) was synthesized. This copolymer formed highly water-dispersed nanoparticles and aggregated into a mixed ion-electron conducting hydrogel when injected into a tissue model. First, we synthetically repeated most of the published methods for PEDOT-S at the lab scale. Surprisingly, analysis using high-resolution matrix-assisted laser desorption ionization-mass spectroscopy showed that almost all the methods generated PEDOT-S derivatives with the same polymer lengths (i.e., oligomers, seven to eight monomers in average); thus, the polymer length cannot account for the differences in the conductivities reported earlier. The main difference, however, was that some methods generated an unintentional copolymer P(EDOT-S/EDOT-OH) that is more prone to aggregate and display higher conductivities in general than the PEDOT-S homopolymer. Based on this, we synthesized the PEDOT-S derivative A5, that displayed the highest film conductivity (33 S cm(-1)) among all PEDOT-S derivatives synthesized. Injecting A5 nanoparticles into the agarose gel cast with a physiological buffer generated a stable and highly conductive hydrogel (1-5 S cm(-1)), where no conductive structures were seen in agarose with the other PEDOT-S derivatives. Furthermore, the ion-treated A5 hydrogel remained stable and maintained initial conductivities for 7 months (the longest period tested) in pure water, and A5 mixed with Fe3O4 nanoparticles generated a magnetoconductive relay device in water. Thus, we have successfully synthesized a water-processable, syringe-injectable, and self-doped PEDOT-S polymer capable of forming a conductive hydrogel in tissue mimics, thereby paving a way for future applications within in vivo electronics.
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| 23. |
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| 24. |
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| 25. |
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| 26. |
- Pavliuk, Mariia V., et al.
(författare)
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Polymer Dots as Photoactive Membrane Vesicles for [FeFe]-Hydrogenase Self-Assembly and Solar-Driven Hydrogen Evolution
- 2022
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Ingår i: Journal of the American Chemical Society. - : American Chemical Society (ACS). - 0002-7863 .- 1520-5126. ; 144:30, s. 13600-13611
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Tidskriftsartikel (refereegranskat)abstract
- A semiartificial photosynthesis approach that utilizes enzymes for solar fuel production relies on efficient photosensitizers that should match the enzyme activity and enable long-term stability. Polymer dots (Pdots) are biocompatible photosensitizers that are stable at pH 7 and have a readily modifiable surface morphology. Therefore, Pdots can be considered potential photosensitizers to drive such enzyme-based systems for solar fuel formation. This work introduces and unveils in detail the interaction within the biohybrid assembly composed of binary Pdots and the HydA1 [FeFe]-hydrogenase from Chlamydomonas reinhardtii. The direct attachment of hydrogenase on the surface of toroid-shaped Pdots was confirmed by agarose gel electrophoresis, cryogenic transmission electron microscopy (Cryo-TEM), and cryogenic electron tomography (Cryo-ET). Ultrafast transient spectroscopic techniques were used to characterize photoinduced excitation and dissociation into charges within Pdots. The study reveals that implementation of a donor–acceptor architecture for heterojunction Pdots leads to efficient subpicosecond charge separation and thus enhances hydrogen evolution (88 460 μmolH2·gH2ase–1·h–1). Adsorption of [FeFe]-hydrogenase onto Pdots resulted in a stable biohybrid assembly, where hydrogen production persisted for days, reaching a TON of 37 500 ± 1290 in the presence of a redox mediator. This work represents an example of a homogeneous biohybrid system combining polymer nanoparticles and an enzyme. Detailed spectroscopic studies provide a mechanistic understanding of light harvesting, charge separation, and transport studied, which is essential for building semiartificial photosynthetic systems with efficiencies beyond natural and artificial systems.
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| 27. |
- Rao, Akhila, et al.
(författare)
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Prediction and exposure of delays from a base station perspective in 5G and beyond networks
- 2022
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Ingår i: 5G-MeMU 2022 - Proceedings of the ACM SIGCOMM 2022 Workshop on 5G and Beyond Network Measurements, Modeling, and Use Cases - Part of SIGCOMM 2022. - New York, NY, USA : Association for Computing Machinery, Inc. - 9781450393935 ; , s. 8-14
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Konferensbidrag (refereegranskat)abstract
- The inherent flexibility of 5G networks come with a high degree of configuration and management complexity. This makes the performance outcome for UEs, more than ever, dependent on intricate configurations and interplay between algorithms at various network components. In this paper, we take initial steps towards a performance exposure system at the base station using a data-driven approach for predicting performance violations in terms of RTT, as observed by the UE, in a 5G mmWave network. We present ML models to predict RTT using low-level and high-frequency base station metrics from a 5G mmWave testbed based on commercially available equipment. Predicting UE performance from a base station perspective, and exposing this knowledge, is valuable for applications to proactively address performance violations. We also compare several methods for feature reduction, which have a significant impact on monitoring load. We demonstrate our model's ability to identify RTT violations, paving the way for network providers towards an intelligent performance exposure system.
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| 28. |
- Rodriguez, A, et al.
(författare)
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Fitness, Food, and Biomarkers: Characterizing Body Composition in 19,634 Early Adolescents
- 2022
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Ingår i: Nutrients. - : MDPI AG. - 2072-6643. ; 14:7
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Tidskriftsartikel (refereegranskat)abstract
- Adolescent obesity persists as a major concern, especially in Central and Eastern Europe, yet evidence gaps exist regarding the pivotal early adolescent years. Our objective was to provide a comprehensive picture using a holistic approach of measured anthropometry in early adolescence, including body composition, cardiorespiratory fitness (CRF), and reported lifestyle characteristics. We aimed to elucidate potential sex/gender differences throughout and associations to biomarkers of disease risk for obese adolescents. Methods: Trained nurses measured 19,634 early adolescents (12–14-year-olds), we collected parental reports, and, for obese adolescents, fasting blood samples in four major Polish cities using a cross-sectional developmental design. Results: 24.7% boys and 18.6% girls were overweight/obese, and 2886 had BMI ≥ 90th percentile. With increasing age, there was greater risk of obesity among boys (p for trend = 0.001) and a decreasing risk of thinness for girls (p for trend = 0.01). Contrary to debate, we found BMI (continuous) was a useful indicator of measured fat mass (FM). There were 38.6% with CRF in the range of poor/very poor and was accounted for primarily by FM in boys, rather than BMI, and systolic blood pressure in girls. Boys, in comparison to girls, engaged more in sports (t = 127.26, p < 0.0001) and consumed more fast food (t = 188.57, p < 0.0001) and sugar-sweetened beverages (167.46, p < 0.0001). Uric acid, a potential marker for prediabetes, was strongly related to BMI in the obese subsample for both boys and girls. Obese girls showed signs of undernutrition. Conclusion: these findings show that overweight/obesity is by far a larger public health problem than thinness in early adolescence and is characterized differentially by sex/gender. Moreover, poor CRF in this age, which may contribute to life course obesity and disease, highlights the need for integrated and personalized intervention strategies taking sex/gender into account.
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| 29. |
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| 30. |
- Rudebeck, Elisabeth, et al.
(författare)
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Flintmining at Södra Sallerups (Sweden)
- 2023
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Ingår i: Prehistoric Flint Mines in Europe. - : Archaeopress. - 9781803272221 - 9781803272214 ; , s. 327-339
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Bokkapitel (refereegranskat)abstract
- The area in Södra Sallerup is, as far as we know, the only large-scale flint mining area in Sweden. Radiocarbon dates indicate that the flint was mined mainly during the Early Neolithic. It is clear, however, that the flint that was scattered throughout the area by the mining activity was used during later periods, even as late as the Viking and Medieval Periods.The large-scale mining during the Early Neolithic was probably related to the extraction of high-quality flint for the production of point-butted axes. The concentration of these axes to south-west Scania and eastern Zealand points in this direction. However, it would be wrong to assume that the mines were merely ‘axe factories’, motivated by economic reasons only. The very extraction of flint from pits and shafts in the chalk was most probably socially and symbolically significant in itself. The activity was probably an integral part of the Early Neolithic mentality involving extraction of resources from the land on a scale that was not envisioned until the introduction of farming in this part of Scandinavia.
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| 31. |
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Storyline i begynneropplæringen : En estetisk og leken tilnærming til læring
- 2023
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Samlingsverk (redaktörskap) (övrigt vetenskapligt/konstnärligt)abstract
- Storyline er en tilnærming til undervisning og læring hvor elever og lærere lager en fortelling sammen. Denne fortellingen danner rammen og konteksten for ulike hendelser som legger til rette for at elevene får eierskap til og medvirkning i eget læringsforløp. Storyline er elevsentrert og tar i bruk aktive og utforskende metoder, og tilnærmingen innbyr til tverrfaglige og temabaserte undervisningsforløp hvor de estetiske læreprosessene står sentralt. I denne antologien viser forfatterne hvordan storyline kan være en ramme for tverrfaglige læringsforløp. Lek og kreativitet står sentralt og danner sammen med fortellingen den røde tråden. Forfatterne gir flere eksempler på gjennomførte storylineopplegg som er tilpasset elevene i begynneropplæringen, 1.-4. trinn. De kan være til både hjelp og inspirasjon når lærere selv skal gjennomføre storyline. En fellesnevner i boken er det tverrfaglige temaet Folkehelse og livsmestring. I begynneropplæringen handler det om å bli kjent med egne følelser, relasjoner til andre og å være en god venn. Forfatterne løfter frem storylines potensial til å være en leken, utforskende og kreativ tilnærming til undervisning og læring, som bygger på det elevene kan. Ved å introdusere elevene til en fremadskridende fortelling får elevene selv være aktører i egen læring. Målgruppen for boken er lærerstudenter på grunnskolelærerutdanningen 1.-7., lærere, lærerutdannere, skoleledere, skoleeiere, og forskere i skole og utdanning som er interessert i å vite mer om alternative undervisningsformer, menneskelig kreativitet og nyskaping.
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| 32. |
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Storyline i ungdomsskolen og i videregående opplæring : En pluralistisk og kritisk tilnærming til bærekraft
- 2023
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Samlingsverk (redaktörskap) (övrigt vetenskapligt/konstnärligt)abstract
- Denne antologien løfter kritiske aspekter, muligheter og utfordringer ved å gjennomføre storyline i ungdomsskole og videregående skole. Forfatterne legger spesiell vekt på bærekraftig utvikling som et av de tre tverrfaglige temaene i Kunnskapsløftet 2020. Den pedagogiske tilnærmingen gir muligheter til å utforske virkelighetsnære hendelser og utfordringer som av natur er fagovergripende. Antologien presenterer varierte eksempler på storylineopplegg tilpasset ulike trinn og elevgrupper, både i ungdomsskolen og i videregående opplæring. Disse vil kunne fungere som hjelp og inspirasjon når lærere selv skal gjennomføre storyline. I tillegg gir antologien innsikt i både teoretiske og didaktiske perspektiver ved storyline. Forfatterne argumenterer for at storyline åpner opp for en helhetlig forståelse av fenomener ved å benytte en undersøkende og kritisk tilnærming. I tillegg fremmer storyline kreativitet og sanseopplevelser. Antologien henvender seg til lærerstudenter, lærere, lærerutdannere, skoleledere, skoleeiere, og forskere i skole og utdanning som er interessert i å vite mer om alternative, utforskende og kreative undervisningsformer.
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| 33. |
- Vujasinovic, M, et al.
(författare)
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Risk of Developing Pancreatic Cancer in Patients with Chronic Pancreatitis
- 2020
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Ingår i: Journal of clinical medicine. - : MDPI AG. - 2077-0383. ; 9:11
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Tidskriftsartikel (refereegranskat)abstract
- Background: Patients with chronic pancreatitis (CP) have an increased risk of developing pancreatic ductal adenocarcinoma (PDAC). We present data on PDAC in one of the most extensive European single-centre cohort studies of patients with CP. Methods: Retrospective analysis of prospectively collected data of patients with CP was performed. Aetiology of CP was determined according to the M-ANNHEIM classification system and only patients with definite CP > 18 years at data analysis were included. The final dataset included 581 patients with definite CP diagnosed between 2003 and 2018. Results: At CP diagnosis, there were 371 (63.9%) males and 210 (36.1%) females (median age 57 years, range 2–86). During 3423 person-years of observation, six pancreatic cancers were diagnosed (0.2% year). The mean time between diagnosis of CP and the occurrence of PDAC was 5.0 years (range 2.7–8.6). None of the cancer patients had a family history of PDAC. Diabetes mellitus (DM) was present in five of six (83.3%) patients with PDAC: in three patients before and in two after CP diagnosis. Clinical/laboratory signs of pancreatic exocrine insufficiency (PEI) were present in five of six (83.3%) patients with PDAC: in two at diagnosis of CP and in three after diagnosis. The mean survival time was 4 months after the diagnosis of PDAC (range 0.5–13). PDAC occurred significantly more often (p < 0.001) in two groups of patients without previous acute pancreatitis (AP): 2 of 20 patients (10%) with low body mass index (BMI) and PEI and in 3 of 10 (30%) patients with high BMI and DM at diagnosis of CP. Conclusions: Patients with CP have a high risk of developing PDAC, although risk is low in absolute terms. Our data suggest the possibility of defining subgroups of patients with a particularly elevated risk of PDAC. Such a possibility would open a path to personalised decision making on initiation of PDAC surveillance of patients with no previous episode of AP, (i) with low BMI and PEI, or (ii) elevated BMI and DM.
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| 35. |
- Wiktorin, Anna H C, et al.
(författare)
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Mapping of Perfusion During Full-Thickness Blepharotomy Using Laser Speckle Contrast Imaging
- 2022
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Ingår i: Ophthalmic Plastic and Reconstructive Surgery. - 1537-2677. ; 38:6, s. 588-592
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: The aim of this study was to monitor how the blood perfusion in human upper eyelids is affected during full-thickness blepharotomy.METHODS: Seven eyelids in 5 patients with upper eyelid retraction due to Graves' disease underwent full-thickness blepharotomy. Perfusion was measured using laser speckle contrast imaging in the eyelid margin and in the conjunctival pedicle.RESULTS: Immediately following the procedure, a nonsignificant reduction in perfusion was observed in the skin of the pretarsal eyelid margin, being 66% of the initial value (p = n.s.). However, a statistically significant decrease in perfusion, to 53% of the initial value (p < 0.01), was seen in the central pedicle of the conjunctiva. There were no surgical complications such as infection, signs of ischemia, or bleeding.CONCLUSIONS: In this study, eyelid perfusion was mapped during full-thickness blepharotomy for the first time using laser speckle contrast imaging. The results showed that perfusion is sufficiently preserved during surgery, probably due to the rich vascular supply in the periocular region, which may explain the low risk of postoperative complications such as ischemia and infection.
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