13,369 results on '"Vik A."'
Search Results
152. Study of traffic-related pollution and its treatment with a particular focus on microplastics in tunnel wash and road runoff water
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Subhash S. Rathnaweera, Eilen A. Vik, Lelum D. Manamperuma, Svein Ole Åstebøl, Jes Vollertsen, Lene S. Heier, and Kjersti W. Kronvall
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microplastics ,road runoff water ,tunnel wash water ,Environmental technology. Sanitary engineering ,TD1-1066 - Abstract
Treatment of tunnel wash runoff water and road runoff water before it reaches the environment is recommended to limit the negative consequences of traffic-related pollution. The efficiency of existing water treatment systems to remove traffic-related microplastic (MP) has not been sufficiently documented. Expanding the knowledge about traffic-related MP and documenting the treatment efficiency of MP in road tunnel wash water (TWW) and road runoff (RRW) treatment systems were the objectives of the presented project. TWW from the Tåsen tunnel, Norway, and RRW from the Fossbekken sedimentation pond were investigated in summer and winter situations. Six commonly available polymer types, tire rubber tread particles (TRP), and road marking paints (RMP) were analyzed in the selected samples. About 0.12 and 0.26 μg/L of polymers were identified in winter and summer TWWs. Significantly higher tire rubber and road marking paint concentrations were identified in the winter sample compared to summer sample. Suspended particle concentration in the Fossbekken RRW treatment pond effluent was lower in the summer than in the winter sample. About 0.002 and 0.0008 μg/L polymer masses were identified in winter and summer samples, respectively. TRP in the winter and summer samples were 0.7 and 0.2 μg7/L, and 13.4 μg/L RMP was found in the winter sample, while it was only 0.008 μg/L in the summer sample. HIGHLIGHTS Microplastic contamination of road runoff water (RRW) and tunnel wash water (TWW) was investigated.; Heavy metal pollution and microplastic particles larger than 10 μm were measured.; Six commonly available polymer types, tire rubber tread particles (TRP), and road marking paint (RMP) in RRW and TWW samples were analyzed.; The treatment efficiencies of a roadside pond and a TWW sedimentation tank was evaluated.;
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- 2023
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153. Wolf genetic diversity compared across Europe using the yardstick method
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Maja Jan, Astrid Vik Stronen, Barbara Boljte, Rok Černe, Đuro Huber, Ruben Iosif, Franc Kljun, Marjeta Konec, Ivan Kos, Miha Krofel, Josip Kusak, Roman Luštrik, Aleksandra Majić Skrbinšek, Barbara Promberger–Füerpass, Hubert Potočnik, Robin Rigg, Peter Trontelj, and Tomaž Skrbinšek
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Medicine ,Science - Abstract
Abstract Integrating data across studies with traditional microsatellite genetic markers requires careful calibration and represents an obstacle for investigation of wide-ranging species where populations require transboundary management. We used the “yardstick” method to compare results published across Europe since 2002 and new wolf (Canis lupus) genetic profiles from the Carpathian Mountains in Central Europe and the Dinaric Mountains in Southeastern Europe, with the latter as our reference population. We compared each population with Dinaric wolves, considering only shared markers (range 4–17). For each population, we calculated standard genetic diversity indices plus calibrated heterozygosity (Hec) and allelic richness (Ac). Hec and Ac in Dinaric (0.704 and 9.394) and Carpathian wolves (0.695 and 7.023) were comparable to those observed in other large and mid-sized European populations, but smaller than those of northeastern Europe. Major discrepancies in marker choices among some studies made comparisons more difficult. However, the yardstick method, including the new measures of Hec and Ac, provided a direct comparison of genetic diversity values among wolf populations and an intuitive interpretation of the results. The yardstick method thus permitted the integration of diverse sources of publicly available microsatellite data for spatiotemporal genetic monitoring of evolutionary potential.
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- 2023
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154. Lower viral evolutionary pressure under stable versus fluctuating conditions in subzero Arctic brines
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Zhi-Ping Zhong, Dean Vik, Josephine Z. Rapp, Olivier Zablocki, Heather Maughan, Ben Temperton, Jody W. Deming, and Matthew B. Sullivan
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Arctic ,Viruses ,Subzero and hypersaline brines ,Cryopeg brine ,Sea ice brine ,Long- and short-read viromics ,Microbial ecology ,QR100-130 - Abstract
Abstract Background Climate change threatens Earth’s ice-based ecosystems which currently offer archives and eco-evolutionary experiments in the extreme. Arctic cryopeg brine (marine-derived, within permafrost) and sea ice brine, similar in subzero temperature and high salinity but different in temporal stability, are inhabited by microbes adapted to these extreme conditions. However, little is known about their viruses (community composition, diversity, interaction with hosts, or evolution) or how they might respond to geologically stable cryopeg versus fluctuating sea ice conditions. Results We used long- and short-read viromics and metatranscriptomics to study viruses in Arctic cryopeg brine, sea ice brine, and underlying seawater, recovering 11,088 vOTUs (~species-level taxonomic unit), a 4.4-fold increase of known viruses in these brines. More specifically, the long-read-powered viromes doubled the number of longer (≥25 kb) vOTUs generated and recovered more hypervariable regions by >5-fold compared to short-read viromes. Distribution assessment, by comparing to known viruses in public databases, supported that cryopeg brine viruses were of marine origin yet distinct from either sea ice brine or seawater viruses, while 94% of sea ice brine viruses were also present in seawater. A virus-encoded, ecologically important exopolysaccharide biosynthesis gene was identified, and many viruses (~half of metatranscriptome-inferred “active” vOTUs) were predicted as actively infecting the dominant microbial genera Marinobacter and Polaribacter in cryopeg and sea ice brines, respectively. Evolutionarily, microdiversity (intra-species genetic variations) analyses suggested that viruses within the stable cryopeg brine were under significantly lower evolutionary pressures than those in the fluctuating sea ice environment, while many sea ice brine virus-tail genes were under positive selection, indicating virus-host co-evolutionary arms races. Conclusions Our results confirmed the benefits of long-read-powered viromics in understanding the environmental virosphere through significantly improved genomic recovery, expanding viral discovery and the potential for biological inference. Evidence of viruses actively infecting the dominant microbes in subzero brines and modulating host metabolism underscored the potential impact of viruses on these remote and underexplored extreme ecosystems. Microdiversity results shed light on different strategies viruses use to evolve and adapt when extreme conditions are stable versus fluctuating. Together, these findings verify the value of long-read-powered viromics and provide foundational data on viral evolution and virus-microbe interactions in Earth’s destabilized and rapidly disappearing cryosphere. Video Abstract
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- 2023
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155. Effect of Dietary Cholesterol, Phytosterol, and Docosahexaenoic Acid on Astaxanthin Absorption and Retention in Rainbow Trout
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Yang Jin, Keshuai Li, Jon Olav Vik, Marie Hillestad, and Rolf Erik Olsen
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Aquaculture. Fisheries. Angling ,SH1-691 - Abstract
Astaxanthin (Ax) determines the flesh redness of a salmonid fish which is the most desirable quality indicator by consumers. Fish cannot synthesize Ax de novo, therefore, the only way to increase flesh redness is to increase dietary input or improve the absorption and retention rate of dietary Ax. As a hydrophobic carotenoid, the absorption of Ax can be modulated by other lipid molecules in the diet. The present study explored the effect of three lipids, cholesterol (CH), phytosterol (PS), and docosahexaenoic acid (DHA) on Ax absorption, transport, and retention in rainbow trout. Dietary CH significantly improved Ax absorption by elevating plasma Ax levels (p
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- 2024
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156. The genome regulatory landscape of Atlantic salmon liver through smoltification.
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Thomas N Harvey, Gareth B Gillard, Line L Røsæg, Fabian Grammes, Øystein Monsen, Jon Olav Vik, Torgeir R Hvidsten, and Simen R Sandve
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Medicine ,Science - Abstract
The anadromous Atlantic salmon undergo a preparatory physiological transformation before seawater entry, referred to as smoltification. Key molecular developmental processes involved in this life stage transition, such as remodeling of gill functions, are known to be synchronized and modulated by environmental cues like photoperiod. However, little is known about the photoperiod influence and genome regulatory processes driving other canonical aspects of smoltification such as the large-scale changes in lipid metabolism and energy homeostasis in the developing smolt liver. Here we generate transcriptome, DNA methylation, and chromatin accessibility data from salmon livers across smoltification under different photoperiod regimes. We find a systematic reduction of expression levels of genes with a metabolic function, such as lipid metabolism, and increased expression of energy related genes such as oxidative phosphorylation, during smolt development in freshwater. However, in contrast to similar studies of the gill, smolt liver gene expression prior to seawater transfer was not impacted by photoperiodic history. Integrated analyses of gene expression, chromatin accessibility, and transcription factor (TF) binding signatures highlight chromatin remodeling and TF dynamics underlying smolt gene regulatory changes. Differential peak accessibility patterns largely matched differential gene expression patterns during smoltification and we infer that ZNF682, KLFs, and NFY TFs are important in driving a liver metabolic shift from synthesis to break down of organic compounds in freshwater. Overall, chromatin accessibility and TFBS occupancy were highly correlated to changes in gene expression. On the other hand, we identified numerous differential methylation patterns across the genome, but associated genes were not functionally enriched or correlated to observed gene expression changes across smolt development. Taken together, this work highlights the relative importance of chromatin remodeling during smoltification and demonstrates that metabolic remodeling occurs as a preadaptation to life at sea that is not to a large extent driven by photoperiod history.
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- 2024
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157. Scaling up evidence-based digital early life nutrition interventions in a county setting: an implementation trial – protocol for Phase 2 of the Nutrition Now project
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Anine Christine Medin, Frøydis Nordgård Vik, Christine Helle, Sissel Heidi Helland, Andrew Keith Wills, Natalie Garzon Osorio, Henrik Lian, Torunn Iveland Ersfjord, Wim Van Daele, Tormod Bjørkkjær, Erlend Nuland Valen, Mekdes Kebede Gebremariam, Erik Grasaas, Charlotte Kiland, Ulrica von Thiele Schwarz, Marianne Hope Abel, Penny Love, Karen Campbell, Harry Rutter, Mary Elizabeth Barker, Elisabet Rudjord Hillesund, and Nina Cecilie Øverby
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implementation ,digital dietary intervention ,early life ,first 1,000 days ,maternal and child health care ,feeding practices ,Public aspects of medicine ,RA1-1270 - Abstract
BackgroundFew effective health interventions transition from smaller efficacy or effectiveness studies to real-world implementation at scale, representing a gap between evidence and practice. Recognising this, we have developed Nutrition Now – a tailored digital resource building on four efficacious dietary interventions, aiming to improve nutrition in the important first 1,000 days of life. Nutrition Now targets and guides expectant parents and parents of 0–2 year olds, serves as a reliable source of evidence-based information for midwives and public health nurses at maternal and child healthcare (MCH) centres, and offers pedagogical tools for early childhood education and care (ECEC) staff. The aim of this study is to implement Nutrition Now at scale and evaluate the impact of different sets of multifaceted implementation strategies on implementation outcomes.MethodsA quasi-experimental design with three study arms will be used, providing either low, medium or high implementation support, when rolled out in 50 municipalities in 2 counties in Norway. Nutrition Now will be implemented in MCH and ECEC settings and made available to expectant parents and parents of 0–2 year olds through social media and MCH. The implementation support builds on strategies described in the Expert Recommendations for Implementing Change (ERIC) implementation framework and is informed by dialogues with stakeholders. Impact of the different degree of implementation support will be assessed by examining reach, adoption, fidelity, and sustainability using usage data generated from the Nutrition Now resource, publicly available municipal data and qualitative interviews with MCH and ECEC staff.DiscussionNutrition Now Phase 2 will break new ground by scaling up successively delivered and complementary dietary interventions in the first 1,000 days of life in a real-life context. The project also seeks to identify what level of implementation support is most effective when implementing digital, scalable, evidence-based early-life nutrition interventions in community settings. The project will inform implementation research and provide knowledge about effective implementation strategies to be used in a national scale-up of Nutrition Now.Trial registrationThe study is registered prospectively (submitted 14/06/2022, registration date: 19/06/2022) in the International Standard Randomised Controlled Trial Number registry (ISRCTN): reg. Number: ISRCTN10694967, https://doi.org/10.1186/ISRCTN10694967.
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- 2024
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158. Lessons learned from talking with adults about nutrition: A qualitative study in the PREPARED project
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Erlend N. Valen, Nina Cecilie Øverby, Polly Hardy‐Johnson, Frøydis N. Vik, Lorentz Salvesen, Mona L. Omholt, Mary Elizabeth Barker, and Elisabet R. Hillesund
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behaviour ,maternal nutrition ,nutrition ,paternal nutrition ,preconception nutrition ,public health ,Pediatrics ,RJ1-570 ,Gynecology and obstetrics ,RG1-991 ,Nutritional diseases. Deficiency diseases ,RC620-627 - Abstract
Abstract Improving diet and dietary behaviour of men and women before pregnancy has the potential to benefit both their current and long‐term health and the health of their children. Little is known, however, about adults' perception of diet's role in prepregnancy health. This study aimed to explore the state of knowledge and awareness of preconception nutritional health in adults within the fertile age range and what they perceived could motivate healthy eating using the self‐determination theory as a theoretical framework. We analysed 33 short exploratory interviews with men (n = 18) and women (n = 15) aged 18–45 years. Participants were grab sampled from three different public locations in the southern part of Norway. Interviews were audio‐recorded, transcribed verbatim in 2020 and analysed using a thematic analysis with a semantic approach in 2022. The findings suggest that adults within the fertile age range are not intrinsically motivated to eat healthily, but when they do, it is because eating healthily often aligns with other goals consistent with their values, that is, getting fit or looking good. They possess some basic knowledge of healthy behaviours during pregnancy but are generally unaware of the importance of preconception health and nutrition. There is a need to increase awareness of the impact of preconception health on the health of this and future generations. Improved nutritional education on the significance of diet before conception might facilitate optimal conditions for conceiving and for pregnancy in the adult population within fertile age range.
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- 2024
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159. Nutrition in a lifecourse perspective: From molecular aspects to public health approaches
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Nina C. Øverby, Elisabet R. Hillesund, Anine C. Medin, Frøydis N. Vik, and Sergej M. Ostojic
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Pediatrics ,RJ1-570 ,Gynecology and obstetrics ,RG1-991 ,Nutritional diseases. Deficiency diseases ,RC620-627 - Published
- 2024
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160. Rethinking recidivism through a causal lens
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Shirvaikar, Vik and Lakshminarayan, Choudur
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Computer Science - Machine Learning ,Computer Science - Computers and Society ,Statistics - Applications - Abstract
Predictive modeling of criminal recidivism, or whether people will re-offend in the future, has a long and contentious history. Modern causal inference methods allow us to move beyond prediction and target the "treatment effect" of a specific intervention on an outcome in an observational dataset. In this paper, we look specifically at the effect of incarceration (prison time) on recidivism, using a well-known dataset from North Carolina. Two popular causal methods for addressing confounding bias are explained and demonstrated: directed acyclic graph (DAG) adjustment and double machine learning (DML), including a sensitivity analysis for unobserved confounders. We find that incarceration has a detrimental effect on recidivism, i.e., longer prison sentences make it more likely that individuals will re-offend after release, although this conclusion should not be generalized beyond the scope of our data. We hope that this case study can inform future applications of causal inference to criminal justice analysis., Comment: 16 main pages, 1 appendix page, 3 figures, 8 tables
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- 2020
161. A systematic search of Zwicky Transient Facility data for ultracompact binary LISA-detectable gravitational-wave sources
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Burdge, Kevin B., Prince, Thomas A., Fuller, Jim, Kaplan, David L., Marsh, Thomas R., Tremblay, Pier-Emmanuel, Zhuang, Zhuyun, Bellm, Eric C., Caiazzo, Ilaria, Coughlin, Michael W., Dhillon, Vik S., Gaensicke, Boris, Rodriguez-Gil, Pablo, Graham, Matthew J., Hermes, J. J., Kupfer, Thomas, Littlefair, S. P., Mroz, Przemek, Phinney, E. S., van Roestel, Jan, Yao, Yuhan, Dekany, Richard G., Drake, Andrew J., Duev, Dmitry A., Hale, David, Feeney, Michael, Helou, George, Kaye, Stephen, Mahabal, Ashish. A., Masci, Frank J., Riddle, Reed, Smith, Roger, Soumagnac, Maayane T., and Kulkarni, S. R.
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
Using photometry collected with the Zwicky Transient Facility (ZTF), we are conducting an ongoing survey for binary systems with short orbital periods ($P_{\rm b}<1\rm \,hr)$ with the goal of identifying new gravitational-wave sources detectable by the upcoming Laser Interferometer Space Antenna (LISA). Here, we present a sample of fifteen binary systems discovered thus far, with orbital periods ranging from $6.91\rm\,min$ to $56.35\rm\,min$. Of the fifteen systems, seven are eclipsing systems which do not show signs of significant mass transfer. Additionally, we have discovered two AM Canum Venaticorum (AM CVn) systems and six systems exhibiting primarily ellipsoidal variations in their light curves. We present follow-up spectroscopy and high-speed photometry confirming the nature of these systems, estimates of their LISA signal-to-noise ratios (SNR), and a discussion of their physical characteristics., Comment: 32 pages, 12 figures, 7 tables, submitted to ApJ
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- 2020
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162. Machine Learning for Transient Recognition in Difference Imaging With Minimum Sampling Effort
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Mong, Yik-Lun, Ackley, Kendall, Galloway, Duncan, Killestein, Tom, Lyman, Joe, Steeghs, Danny, Dhillon, Vik, O'Brien, Paul, Ramsay, Gavin, Poshyachinda, Saran, Kotak, Rubina, Nuttall, Laura, Pall'e, Enric, Pollacco, Don, Thrane, Eric, Dyer, Martin, Ulaczyk, Krzysztof, Cutter, Ryan, McCormac, James, Chote, Paul, Levan, Andrew, Marsh, Tom, Stanway, Elizabeth, Gompertz, Ben, Wiersema, Klaas, Chrimes, Ashley, Obradovic, Alexander, Mullaney, James, Daw, Ed, Littlefair, Stuart, Maund, Justyn, Makrygianni, Lydia, Burhanudin, Umar, Starling, Rhaana, Eyles, Rob, Tooke, Spencer, Duffy, Christopher, Aukkaravittayapun, Suparerk, Sawangwit, Utane, Awiphan, Supachai, Mkrtichian, David, Irawati, Puji, Mattila, Seppo, Heikkil"a, Teppo, Breton, Rene, Kennedy, Mark, Mata-Sanchez, Daniel, and Rol, Evert
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Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
The amount of observational data produced by time-domain astronomy is exponentially in-creasing. Human inspection alone is not an effective way to identify genuine transients fromthe data. An automatic real-bogus classifier is needed and machine learning techniques are commonly used to achieve this goal. Building a training set with a sufficiently large number of verified transients is challenging, due to the requirement of human verification. We presentan approach for creating a training set by using all detections in the science images to be thesample of real detections and all detections in the difference images, which are generated by the process of difference imaging to detect transients, to be the samples of bogus detections. This strategy effectively minimizes the labour involved in the data labelling for supervised machine learning methods. We demonstrate the utility of the training set by using it to train several classifiers utilizing as the feature representation the normalized pixel values in 21-by-21pixel stamps centered at the detection position, observed with the Gravitational-wave Optical Transient Observer (GOTO) prototype. The real-bogus classifier trained with this strategy can provide up to 95% prediction accuracy on the real detections at a false alarm rate of 1%., Comment: 9 pages, 8 figures
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- 2020
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163. On the braid monodromy group of a polynomial in one variable
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Kulikov, Vik. S.
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Mathematics - Geometric Topology - Abstract
It is proved that the braid monodromy group $\Gamma_{P(z)}$ of a polynomial $P(z)\in\mathbb C[z]$, $\deg P(z)=n$, is the braid group $\text{Br}_n$ if the polynomial $P(z)$ has $n-1$ distinct critical values., Comment: 7 pages, Fig. 2 is corrected
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- 2020
164. Rigid germs of finite morphisms of smooth surfaces and rational Belyi pairs
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Kulikov, Vik. S.
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Mathematics - Algebraic Geometry - Abstract
In \cite{K-rig}, a map $\beta:\mathcal R\to\mathcal{B}el$ from the set $\mathcal R$ of equivalence classes of rigid germs of finite morphisms branched in germs of curves having $ADE$ singularity types onto the set $\mathcal{B}el$ of rational Belyi pairs $f:\mathbb P^1\to\mathbb P^1$ considered up to the action of $PGL(2,\mathbb C)$ was defined. In this article, the inverse images of this map are investigated in terms of monodromies of Belyi pairs., Comment: 27 pages
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- 2020
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165. A new class of Roche lobe-filling hot subdwarf binaries
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Kupfer, Thomas, Bauer, Evan B., Burdge, Kevin B., van Roestel, Jan, Bellm, Eric C., Fuller, Jim, Hermes, JJ, Marsh, Thomas R., Bildsten, Lars, Kulkarni, Shrinivas R., Phinney, E. S., Prince, Thomas A., Szkody, Paula, Yao, Yuhan, Irrgang, Andreas, Heber, Ulrich, Schneider, David, Dhillon, Vik S., Murawski, Gabriel, Drake, Andrew J., Duev, Dmitry A., Feeney, Michael, Graham, Matthew J., Laher, Russ R., Littlefair, S. P., Mahabal, A. A., Masci, Frank J., Porter, Michael, Reiley, Dan, Rodriguez, Hector, Rusholme, Ben, Shupe, David L., and Soumagnac, Maayane T.
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
We present the discovery of the second binary with a Roche lobe-filling hot subdwarf transferring mass to a white dwarf (WD) companion. This 56 minute binary was discovered using data from the Zwicky Transient Facility. Spectroscopic observations reveal an He-sdOB star with an effective temperature of $T_{\rm eff}=33,700\pm1000$ K and a surface gravity of $log(g)=5.54\pm0.11$. The GTC+HiPERCAM light curve is dominated by the ellipsoidal deformation of the He-sdOB star and shows an eclipse of the He-sdOB by an accretion disk as well as a weak eclipse of the WD. We infer a He-sdOB mass of $M_{\rm sdOB}=0.41\pm0.04$ M$_\odot$ and a WD mass of $M_{\rm WD}=0.68\pm0.05$ M$_\odot$. The weak eclipses imply a WD black-body temperature of $63,000\pm10,000$ K and a radius $R_{\rm WD}=0.0148\pm0.0020$ M$_\odot$ as expected for a WD of such high temperature. The He-sdOB star is likely undergoing hydrogen shell burning and will continue transferring mass for $\approx1$ Myrs at a rate of $10^{-9} M_\odot {\rm yr}^{-1}$ which is consistent with the high WD temperature. The hot subdwarf will then turn into a WD and the system will merge in $\approx30$ Myrs. We suggest that Galactic reddening could bias discoveries towards preferentially finding Roche lobe-filling systems during the short-lived shell burning phase. Studies using reddening corrected samples should reveal a large population of helium core-burning hot subdwarfs with $T_{\rm eff}\approx25,000$ K in binaries of 60-90 minutes with WDs. Though not yet in contact, these binaries would eventually come into contact through gravitational wave emission and explode as a sub-luminous thermonuclear supernova or evolve into a massive single WD., Comment: accepted for publication in ApJL, 11 pages, 5 figures and 1 tables. arXiv admin note: text overlap with arXiv:2002.01485
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- 2020
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166. White Paper on MAAT@GTC
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Prada, Francisco, Content, Robert, Goobar, Ariel, Izzo, Luca, Pérez, Enrique, Agnello, Adriano, del Burgo, Carlos, Dhillon, Vik, Diego, José M., Galbany, Lluis, García-Rojas, Jorge, Jones, David, Lawrence, Jon, Martín, Eduardo, Mediavilla, Evencio, García, M. Ángeles Pérez, Almeida, Jorge Sánchez, Pulido, José A. Acosta, López-Sánchez, Angel R., Arribas, Santiago, Carrera, Francisco J., Corral, Amalia, Domínguez, Inmaculada, Mateos, Silvia, Nuñez, Silvia Martínez, Villaver, Eva, Osorio, María Rosa Zapatero, Albertus, Conrado, Battaia, Fabrizio Arrigoni, Barrado, David, Bejar, Víctor J. S., Boffin, Henri M. J., Bouy, Herve, Burgasser, Adam, Esteban, Cesar, Lodieu, Nicolas, Calderón, María Morales, Garrido, Antonio Pérez, Gil, Pablo Rodríguez, Carracedo, Ana Sagués, García, Miguel Santander, Solano, Enrique, Torres, Manuel A. P., and Wesson, Roger
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Astrophysics - Instrumentation and Methods for Astrophysics ,Astrophysics - Cosmology and Nongalactic Astrophysics ,Astrophysics - Astrophysics of Galaxies ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
MAAT is proposed as a visitor mirror-slicer optical system that will allow the OSIRIS spectrograph on the 10.4-m Gran telescopio CANARIAS (GTC) the capability to perform Integral Field Spectroscopy (IFS) over a seeing-limited FoV 14.20''x10'' with a slice width of 0.303''. MAAT@GTC will enhance the resolution power of OSIRIS by 1.6 times as compared to its 0.6'' wide long-slit. All the eleven OSIRIS grisms and volume-phase holographic gratings will be available to provide broad spectral coverage with moderate resolution (R=600 up to 4100) in the 3600 - 10000 {\AA} wavelength range. MAAT unique observing capabilities will broaden its use to the needs of the GTC community to unveil the nature of most striking phenomena in the universe well beyond time-domain astronomy. The GTC equipped with OSIRIS+MAAT will also play a fundamental role in synergy with other facilities, some of them operating on the northern ORM at La Palma. This White Paper presents the different aspects of MAAT@GTC - including scientific and technical specifications, outstanding science cases, and an outline of the instrument concept., Comment: 49 pages, 36 figures
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- 2020
167. An ultra-massive white dwarf with a mixed hydrogen-carbon atmosphere as a likely merger remnant
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Hollands, Mark A., Tremblay, Pier-Emmanuel, Gänsicke, Boris T., Camisassa, María E., Koester, Detlev, Aungwerojwit, Amornrat, Chote, Paul, Córsico, Alejandro H., Dhillon, Vik S., Gentile-Fusillo, Nicola P., Hoskin, Matthew J., Izquierdo, Paula, Marsh, Tom R., and Steeghs, Danny
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Astrophysics - Solar and Stellar Astrophysics - Abstract
White dwarfs are dense, cooling stellar embers consisting mostly of carbon and oxygen, or oxygen and neon (with a few percent carbon) at higher initial stellar masses. These stellar cores are enveloped by a shell of helium which in turn is usually surrounded by a layer of hydrogen, generally prohibiting direct observation of the interior composition. However, carbon is observed at the surface of a sizeable fraction of white dwarfs, sometimes with traces of oxygen, and it is thought to be dredged-up from the core by a deep helium convection zone. In these objects only traces of hydrogen are found as large masses of hydrogen are predicted to inhibit hydrogen/helium convective mixing within the envelope. We report the identification of WDJ055134.612+413531.09, an ultra-massive (1.14 $M_\odot$) white dwarf with a unique hydrogen/carbon mixed atmosphere (C/H=0.15 in number ratio). Our analysis of the envelope and interior indicates that the total hydrogen and helium mass fractions must be several orders of magnitude lower than predictions of single star evolution: less than $10^{-9.5}$ and $10^{-7.0}$, respectively. Due to the fast kinematics ($129\pm5$ km/s relative to the local standard of rest), large mass, and peculiar envelope composition, we argue that WDJ0551+4135 is consistent with formation from the merger of two white dwarfs in a tight binary system., Comment: Published in Nature Astronomy Letters on March 2nd 2020, https://www.nature.com/articles/s41550-020-1028-0
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- 2020
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168. The first ultracompact Roche lobe-filling hot subdwarf binary
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Kupfer, Thomas, Bauer, Evan B., Marsh, Thomas R., van Roestel, Jan, Bellm, Eric C., Burdge, Kevin B., Coughlin, Michael W., Fuller, Jim, Hermes, JJ, Bildsten, Lars, Kulkarni, Shrinivas R., Prince, Thomas A., Szkody, Paula, Dhillon, Vik S., Murawski, Gabriel, Burruss, Rick, Dekany, Richard, Delacroix, Alex, Drake, Andrew J., Duev, Dmitry A., Feeney, Michael, Graham, Matthew J., Kaplan, David L., Laher, Russ R., Littlefair, S. P., Masci, Frank J., Riddle, Reed, Rusholme, Ben, Serabyn, Eugene, Smith, Roger M., Shupe, David L., and Soumagnac, Maayane T.
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Astrophysics - Solar and Stellar Astrophysics - Abstract
We report the discovery of the first short period binary in which a hot subdwarf star (sdOB) fills its Roche lobe and started mass transfer to its companion. The object was discovered as part of a dedicated high-cadence survey of the Galactic Plane named the Zwicky Transient Facility and exhibits a period of $P_{\rm orb}=39.3401(1)$ min, making it the most compact hot subdwarf binary currently known. Spectroscopic observations are consistent with an intermediate He-sdOB star with an effective temperature of $T_{\rm eff}=42,400\pm300$ K and a surface gravity of $\log(g)=5.77\pm0.05$. A high-signal-to noise GTC+HiPERCAM light curve is dominated by the ellipsoidal deformation of the sdOB star and an eclipse of the sdOB by an accretion disk. We infer a low-mass hot subdwarf donor with a mass $M_{\rm sdOB}=0.337\pm0.015$ M$_\odot$ and a white dwarf accretor with a mass $M_{\rm WD}=0.545\pm0.020$ M$_\odot$. Theoretical binary modeling indicates the hot subdwarf formed during a common envelope phase when a $2.5-2.8$ M$_\odot$ star lost its envelope when crossing the Hertzsprung Gap. To match its current $P_{\rm orb}$, $T_{\rm eff}$, $\log(g)$, and masses, we estimate a post-common envelope period of $P_{\rm orb}\approx150$ min, and find the sdOB star is currently undergoing hydrogen shell burning. We estimate that the hot subdwarf will become a white dwarf with a thick helium layer of $\approx0.1$ M$_\odot$ and will merge with its carbon/oxygen white dwarf companion after $\approx17$ Myr and presumably explode as a thermonuclear supernova or form an R CrB star., Comment: accepted for publication in ApJ, 21 pages, 12 figures and 4 tables
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- 2020
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169. Føreord
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Ragni Vik Johnsen, Carola Kleemann, Øystein A. Vangsnes, and Maud Westendorp
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dialektologi ,struktur ,ideologi ,mangfald ,Language. Linguistic theory. Comparative grammar ,P101-410 - Published
- 2023
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170. Modified recurrent equation-based cubic spline interpolation for missing data recovery in phasor measurement unit (PMU) [version 3; peer review: 2 approved, 1 not approved]
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Timothy Tzen Vun Yap, Shruthi Thangaraj, and Vik Tor Goh
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phasor measurement unit ,missing data ,data recovery ,smart grid ,interpolation ,cubic spline ,eng ,Medicine ,Science - Abstract
Background Smart grid systems require high-quality Phasor Measurement Unit (PMU) data for proper operation, control, and decision-making. Missing PMU data may lead to improper actions or even blackouts. While the conventional cubic interpolation methods based on the solution of a set of linear equations to solve for the cubic spline coefficients have been applied by many researchers for interpolation of missing data, the computational complexity increases non-linearly with increasing data size. Methods In this work, a modified recurrent equation-based cubic spline interpolation procedure for recovering missing PMU data is proposed. The recurrent equation-based method makes the computations of spline constants simpler. Using PMU data from the State Load Despatch Center (SLDC) in Madhya Pradesh, India, a comparison of the root mean square error (RMSE) values and time of calculation (ToC) is calculated for both methods. Results The modified recurrent relation method could retrieve missing values 10 times faster when compared to the conventional cubic interpolation method based on the solution of a set of linear equations. The RMSE values have shown the proposed method is effective even for special cases of missing values (edges, continuous missing values). Conclusions The proposed method can retrieve any number of missing values at any location using observed data with a minimal number of calculations.
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- 2023
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171. Bladder contractility index changes with short-term antimuscarinic therapy in patients with detrusor overactivity: A placebo controlled randomised study
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Alka Ashok Bhide, Bernadette Lemmon, Philip Rahmanou, G.A. Digesu, and Vik Khullar
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Antimuscarinics ,Bladder contractility ,Placebo controlled ,Detrusor overactivity ,Randomised study ,Ambulatory urodynamics ,Diseases of the genitourinary system. Urology ,RC870-923 - Abstract
Aims:: Bladder contractility is altered by high doses of anticholinergics. It is unknown if anticholinergics at doses used for treating overactive bladder alter bladder contractility. This is a randomised, double-blind, placebo controlled cross-over multicentre study with two 2-week treatment periods. Patients with a previous diagnosis of detrusor overactivity and reporting urinary frequency of at least seven times a day, one or more episodes of urge urinary incontinence per week and at least seven episodes of urgency per week were included. Methods:: After a two-week washout period, subjects were randomised to receive propiverine 20 mg od, propiverine 15 mg tds, oxybutynin 5 mg tds or placebo for 2 weeks. After a second washout period, they were randomised to receive 2 weeks of another treatment not previously used. Ambulatory urodynamic monitoring was performed according to ICS standards for 4 h, using a standardised protocol before and after treatment. The bladder contractility index (BCI) was given by the formula: BCI = PdetQmax+ 5Qmax. The main outcome measure was the average BCI for the first 2 voids for each of the treatment. Results:: 77 participants were recruited. The average BCI for the first two voids was 143 (range 24–314). The BCI was not statistically different before and after antimuscarinic therapy or placebo although there were reductions in urinary frequency and urgency over placebo indicating efficacy over placebo in the treatment of detrusor overactivity. Conclusions:: The bladder contractility index did not change significantly in response to antimuscarinic therapy despite a therapeutic effect. This suggests efficacy is mediated by an effect on another system such as sensory rather than motor function.
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- 2023
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172. Mathematical Modeling, Laboratory Experiments, and Sensitivity Analysis of Bioplug Technology at Darcy Scale
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Landa-Marbán, David, Bødtker, Gunhild, Vik, Bartek Florczyk, Pettersson, Per, Pop, Iuliu Sorin, Kumar, Kundan, and Radu, Florin Adrian
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Physics - Applied Physics ,Physics - Fluid Dynamics - Abstract
In this paper we study a Darcy-scale mathematical model for biofilm formation in porous media. The pores in the core are divided into three phases: water, oil, and biofilm. The water and oil flow are modeled by an extended version of Darcy's law and the substrate is transported by diffusion and convection in the water phase. Initially there is biofilm on the pore walls. The biofilm consumes substrate for production of biomass and modifies the pore space which changes the rock permeability. The model includes detachment of biomass due to water flux and death of bacteria, and is implemented in MRST. We discuss the capability of the numerical simulator to capture results from laboratory experiments. We perform a novel sensitivity analysis based on sparse-grid interpolation and multi-wavelet expansion to identify the critical model parameters. Numerical experiments using diverse injection strategies are performed to study the impact of different porosity-permeability relations in a core saturated with water and oil.
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- 2019
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173. Resilience of cooperatives during global pandemics – Short-term effects of Covid-19 on lending behaviour of British credit unions
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Vik, Pål M., Curtis, Joanna, and Dayson, Karl T.
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- 2023
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174. Bladder contractility index changes with short-term antimuscarinic therapy in patients with detrusor overactivity: A placebo controlled randomised study
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Bhide, Alka Ashok, Lemmon, Bernadette, Rahmanou, Philip, Digesu, G.A., and Khullar, Vik
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- 2023
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175. The longitudinal course of anxiety, depression and apathy through two years after stroke
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Sagen-Vik, Ulrike, Finset, Arnstein, Moum, Torbjørn, Vik, Tom Gunnar, and Dammen, Toril
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- 2022
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176. Potential virus-mediated nitrogen cycling in oxygen-depleted oceanic waters
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Gazitúa, M Consuelo, Vik, Dean R, Roux, Simon, Gregory, Ann C, Bolduc, Benjamin, Widner, Brittany, Mulholland, Margaret R, Hallam, Steven J, Ulloa, Osvaldo, and Sullivan, Matthew B
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Microbiology ,Biological Sciences ,Ecology ,Infectious Diseases ,Genetics ,Infection ,Ecosystem ,Nitrogen ,Oceans and Seas ,Oxygen ,Seawater ,Viruses ,Environmental Sciences ,Technology ,Biological sciences ,Environmental sciences - Abstract
Viruses play an important role in the ecology and biogeochemistry of marine ecosystems. Beyond mortality and gene transfer, viruses can reprogram microbial metabolism during infection by expressing auxiliary metabolic genes (AMGs) involved in photosynthesis, central carbon metabolism, and nutrient cycling. While previous studies have focused on AMG diversity in the sunlit and dark ocean, less is known about the role of viruses in shaping metabolic networks along redox gradients associated with marine oxygen minimum zones (OMZs). Here, we analyzed relatively quantitative viral metagenomic datasets that profiled the oxygen gradient across Eastern Tropical South Pacific (ETSP) OMZ waters, assessing whether OMZ viruses might impact nitrogen (N) cycling via AMGs. Identified viral genomes encoded six N-cycle AMGs associated with denitrification, nitrification, assimilatory nitrate reduction, and nitrite transport. The majority of these AMGs (80%) were identified in T4-like Myoviridae phages, predicted to infect Cyanobacteria and Proteobacteria, or in unclassified archaeal viruses predicted to infect Thaumarchaeota. Four AMGs were exclusive to anoxic waters and had distributions that paralleled homologous microbial genes. Together, these findings suggest viruses modulate N-cycling processes within the ETSP OMZ and may contribute to nitrogen loss throughout the global oceans thus providing a baseline for their inclusion in the ecosystem and geochemical models.
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- 2021
177. Extracting functionally accurate context-specific models of Atlantic salmon metabolism
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Håvard Molversmyr, Ove Øyås, Filip Rotnes, and Jon Olav Vik
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Biology (General) ,QH301-705.5 - Abstract
Abstract Constraint-based models (CBMs) are used to study metabolic network structure and function in organisms ranging from microbes to multicellular eukaryotes. Published CBMs are usually generic rather than context-specific, meaning that they do not capture differences in reaction activities, which, in turn, determine metabolic capabilities, between cell types, tissues, environments, or other conditions. Only a subset of a CBM’s metabolic reactions and capabilities are likely to be active in any given context, and several methods have therefore been developed to extract context-specific models from generic CBMs through integration of omics data. We tested the ability of six model extraction methods (MEMs) to create functionally accurate context-specific models of Atlantic salmon using a generic CBM (SALARECON) and liver transcriptomics data from contexts differing in water salinity (life stage) and dietary lipids. Three MEMs (iMAT, INIT, and GIMME) outperformed the others in terms of functional accuracy, which we defined as the extracted models’ ability to perform context-specific metabolic tasks inferred directly from the data, and one MEM (GIMME) was faster than the others. Context-specific versions of SALARECON consistently outperformed the generic version, showing that context-specific modeling better captures salmon metabolism. Thus, we demonstrate that results from human studies also hold for a non-mammalian animal and major livestock species.
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- 2023
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178. Functional activity level reported by an informant is an early predictor of Alzheimer’s disease
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Alexandra Vik, Marek Kociński, Ingrid Rye, Astri J. Lundervold, and Alexander S. Lundervold
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Alzheimer’s disease ,Classification ,Explainable machine learning ,Functional activity questionnaire ,Mild cognitive impairment ,Partial dependency plots ,Geriatrics ,RC952-954.6 - Abstract
Abstract Background Loss of autonomy in day-to-day functioning is one of the feared outcomes of Alzheimer’s disease (AD), and relatives may have been worried by subtle behavioral changes in ordinary life situations long before these changes are given medical attention. In the present study, we ask if such subtle changes should be given weight as an early predictor of a future AD diagnosis. Methods Longitudinal data from the Alzheimer’s Disease Neuroimaging Initiative (ADNI) were used to define a group of adults with a mild cognitive impairment (MCI) diagnosis remaining stable across several visits (sMCI, n=360; 55-91 years at baseline), and a group of adults who over time converted from having an MCI diagnosis to an AD diagnosis (cAD, n=320; 55-88 years at baseline). Eleven features were used as input in a Random Forest (RF) binary classifier (sMCI vs. cAD) model. This model was tested on an unseen holdout part of the dataset, and further explored by three different permutation-driven importance estimates and a comprehensive post hoc machine learning exploration. Results The results consistently showed that measures of daily life functioning, verbal memory function, and a volume measure of hippocampus were the most important predictors of conversion from an MCI to an AD diagnosis. Results from the RF classification model showed a prediction accuracy of around 70% in the test set. Importantly, the post hoc analyses showed that even subtle changes in everyday functioning noticed by a close informant put MCI patients at increased risk for being on a path toward the major cognitive impairment of an AD diagnosis. Conclusion The results showed that even subtle changes in everyday functioning should be noticed when reported by relatives in a clinical evaluation of patients with MCI. Information of these changes should also be included in future longitudinal studies to investigate different pathways from normal cognitive aging to the cognitive decline characterizing different stages of AD and other neurodegenerative disorders.
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- 2023
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179. The continuing evolution of a cancer prevention, screening, and survivorship ECHO: A second year of implementation
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Mary Ann Etling, Terry A. Vik, Andrea D. Janota, Kaley L. Liang, Caroline L. Kryder‐Reid, Mary Robertson, Caitlin Scanlon, Anyé Carson, Jon Agley, and Tyler S. Severance
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cancer education ,cancer prevention ,clinical management ,screening ,survival ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Abstract Introduction An estimated 39,010 Indiana residents were diagnosed with cancer in 2021. To address the cancer burden, Project ECHO (Extension Community Healthcare Outcomes) was launched in 2019 in Indiana to build specialty healthcare capacity among non‐specialists. Due to positive outcomes from the pilot year, the Cancer Prevention, Screening, and Survivorship ECHO was implemented for a second year. The purpose of this study was to measure the participation and regional impact of this ECHO. Methods ECHO sessions occurred twice monthly from October 2020 to October 2021. Changes were implemented in response to feedback from the pilot year, including making the curriculum more practical for learners and adding accreditation opportunities. Participant information and feedback was extracted from electronic surveys for review. Results There were 24 ECHO sessions with 213 unique participants, increased from 140 unique participants in the pilot year. An average of 23.5 individuals attended each session, increased from 15.5 individuals per session. Enrolled participants served in a diverse set of roles and represented 247 zip codes, 30 Indiana counties, and 32 states across the United States, each of which increased from the pilot year. Discussion In this second year, this ECHO expanded to reach more participants with increased attendance and a more diverse distribution of roles within healthcare, which may be attributed to feedback‐driven curriculum design. Cancer care is multi‐disciplinary, with health educators, nurses, and administrators, each acting within the cancer care continuum. As a result, this ECHO has been adapted to serve an increasingly broad distribution of professionals. Conclusion The second year of the Cancer Prevention, Screening, and Survivorship ECHO displayed increased overall enrollment and participation, greater diversity among participant roles, and a wider reach across Indiana and the United States.
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- 2023
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180. Women’s experiences and views on early breastfeeding during the COVID-19 pandemic in Norway: quantitative and qualitative findings from the IMAgiNE EURO study
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Eline Skirnisdottir Vik, Sigrun Kongslien, Ingvild Hersoug Nedberg, Ilaria Mariani, Emanuelle Pessa Valente, Benedetta Covi, and Marzia Lazzerini
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Early breastfeeding ,COVID-19 ,Questionnaire ,Survey ,Respectful maternity care ,Quality of maternal and newborn care ,Pediatrics ,RJ1-570 ,Public aspects of medicine ,RA1-1270 - Abstract
Abstract Background Little is known about women’s experience of care and views on early breastfeeding during the COVID-19 pandemic in Norway. Methods Women (n = 2922) who gave birth in a facility in Norway between March 2020 and June 2021 were invited to answer an online questionnaire based on World Health Organization (WHO) Standard-based quality measures, exploring their experiences of care and views on early breastfeeding during the COVID-19 pandemic. To examine associations between year of birth (2020, 2021) and early breastfeeding-related factors, we estimated odds ratios (ORs) with 95% confidence intervals (CIs) using multiple logistic regression. Qualitative data were analysed using Systematic Text Condensation. Results Compared to the first year of the pandemic (2020), women who gave birth in 2021 reported higher odds of experiencing adequate breastfeeding support (adjOR 1.79; 95% CI 1.35, 2.38), immediate attention from healthcare providers when needed (adjOR 1.89; 95% CI 1.49, 2.39), clear communication from healthcare providers (adjOR 1.76; 95% CI 1.39, 2.22), being allowed companion of choice (adjOR 1.47; 95% CI 1.21, 1.79), adequate visiting hours for partner (adjOR 1.35; 95% CI 1.09, 1.68), adequate number of healthcare providers (adjOR 1.24; 95% CI 1.02, 1.52), and adequate professionalism of the healthcare providers (adjOR 1.65; 95% CI 1.32, 2.08). Compared to 2020, in 2021 we found no difference in skin-to-skin contact, early breastfeeding, exclusive breastfeeding at discharge, adequate number of women per room, or women’s satisfaction. In their comments, women described understaffed postnatal wards, early discharge and highlighted the importance of breastfeeding support, and concerns about long-term consequences such as postpartum depression. Conclusions In the second year of the pandemic, WHO Standard-based quality measures related to breastfeeding improved for women giving birth in Norway compared to the first year of the pandemic. Women’s general satisfaction with care during COVID-19 did however not improve significantly from 2020 to 2021. Compared to pre-pandemic data, our findings suggest an initial decrease in exclusive breastfeeding at discharge during the COVID-19 pandemic in Norway with little difference comparing 2020 versus 2021. Our findings should alert researchers, policy makers and clinicians in postnatal care services to improve future practices.
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- 2023
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181. Kubelka, Paul
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Brill, Michael H., Vik, Michal, Shamey, Renzo, Section editor, and Shamey, Renzo, editor
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- 2023
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182. A framework for standardised tissue sampling and processing during resection of diffuse intracranial glioma: joint recommendations from four RANO groups
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Aldape, Kenneth, Baehring, Joachim M., Bello, Lorenzo, Brat, Daniel J., Cahill, Daniel P., Chung, Caroline, Colman, Howard, Dietrich, Jorg, Drummond, Katharine, Esquenazi, Yoshua, Gerstner, Elizabeth R., Furtner, Julia, Garibotto, Valentina, Kaufmann, Timothy J., Komori, Takashi, Kotecha, Rupesh, Liau, Linda M., Lupo, Janine M., Minniti, Giuseppe, Narita, Yoshitaka, Niyazi, Maximilian, Perry, Arie, Preusser, Matthias, Rudà, Roberta, Sanai, Nader, Schmidt, Nils-Ole, Steinbach, Joachim P., Thust, Stefanie C., Tolboom, Nelleke, van der Hoorn, Anouk, van der Vaart, Thijs, Verger, Antoine, Vik-Mo, Einar Osland, Watts, Colin, Westphal, Manfred, Wesseling, Pieter, Young, Jacob S., Karschnia, Philipp, Smits, Marion, Reifenberger, Guido, Le Rhun, Emilie, Ellingson, Benjamin M, Galldiks, Norbert, Kim, Michelle M, Huse, Jason T, Schnell, Oliver, Harter, Patrick N, Mohme, Malte, von Baumgarten, Louisa, Albert, Nathalie L, Huang, Raymond Y, Mehta, Minesh P, van den Bent, Martin, Weller, Michael, Vogelbaum, Michael A, Chang, Susan M, Berger, Mitchel S, and Tonn, Joerg-Christian
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- 2023
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183. Tobacco smoking related to childhood trauma mediated by cognitive control and impulsiveness in severe mental disorders
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Lunding, Synve Hoffart, Ueland, Torill, Aas, Monica, Høegh, Margrethe Collier, Werner, Maren Caroline Frogner, Rødevand, Linn, Johansen, Ingrid Torp, Hjell, Gabriela, Ormerod, Monica Bettina Elkjær Greenwood, Ringen, Petter Andreas, Ottesen, Akiah, Lagerberg, Trine Vik, Melle, Ingrid, Andreassen, Ole A., Simonsen, Carmen, and Steen, Nils Eiel
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- 2023
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184. Mismatch negativity in schizophrenia spectrum and bipolar disorders: Group and sex differences and associations with symptom severity
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Pentz, Atle Bråthen, Timpe, Clara Maria Fides, Normann, Elizabeth Marie, Slapø, Nora Berz, Melle, Ingrid, Lagerberg, Trine Vik, Steen, Nils Eiel, Westlye, Lars T., Jönsson, Erik G., Haukvik, Unn K., Moberget, Torgeir, Andreassen, Ole A., and Elvsåshagen, Torbjørn
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- 2023
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185. Comparative effectiveness of decompressive craniectomy versus craniotomy for traumatic acute subdural hematoma (CENTER-TBI): an observational cohort study
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Åkerlund, Cecilia, Amrein, Krisztina, Andelic, Nada, Andreassen, Lasse, Anke, Audny, Antoni, Anna, Audibert, Gérard, Azouvi, Philippe, Azzolini, Maria Luisa, Bartels, Ronald, Barzó, Pál, Beauvais, Romuald, Beer, Ronny, Bellander, Bo-Michael, Belli, Antonio, Benali, Habib, Berardino, Maurizio, Beretta, Luigi, Blaabjerg, Morten, Bragge, Peter, Brazinova, Alexandra, Brinck, Vibeke, Brooker, Joanne, Brorsson, Camilla, Buki, Andras, Bullinger, Monika, Cabeleira, Manuel, Caccioppola, Alessio, Calappi, Emiliana, Calvi, Maria Rosa, Cameron, Peter, Lozano, Guillermo Carbayo, Carbonara, Marco, Castaño-León, Ana M., Cavallo, Simona, Chevallard, Giorgio, Chieregato, Arturo, Citerio, Giuseppe, Clusmann, Hans, Coburn, Mark Steven, Coles, Jonathan, Cooper, Jamie D., Correia, Marta, Čović, Amra, Curry, Nicola, Czeiter, Endre, Czosnyka, Marek, Dahyot-Fizelier, Claire, Dark, Paul, Dawes, Helen, De Keyser, Véronique, Degos, Vincent, Della Corte, Francesco, Boogert, Hugo den, Depreitere, Bart, Đilvesi, Đula, Dixit, Abhishek, Donoghue, Emma, Dreier, Jens, Dulière, Guy-Loup, Ercole, Ari, Esser, Patrick, Ezer, Erzsébet, Fabricius, Martin, Feigin, Valery L., Foks, Kelly, Frisvold, Shirin, Furmanov, Alex, Gagliardo, Pablo, Galanaud, Damien, Gantner, Dashiell, Gao, Guoyi, George, Pradeep, Ghuysen, Alexandre, Giga, Lelde, Glocker, Ben, Golubović, Jagoš, Gomez, Pedro A., Gratz, Johannes, Gravesteijn, Benjamin, Grossi, Francesca, Gruen, Russell L., Gupta, Deepak, Haagsma, Juanita A., Haitsma, Iain, Helbok, Raimund, Helseth, Eirik, Horton, Lindsay, Huijben, Jilske, Hutchinson, Peter J., Jacobs, Bram, Jankowski, Stefan, Jarrett, Mike, Jiang, Ji-yao, Johnson, Faye, Jones, Kelly, Karan, Mladen, Kolias, Angelos G., Kompanje, Erwin, Kondziella, Daniel, Kornaropoulos, Evgenios, Koskinen, Lars-Owe, Kovács, Noémi, Lagares, Alfonso, Lanyon, Linda, Laureys, Steven, Lecky, Fiona, Ledoux, Didier, Lefering, Rolf, Legrand, Valerie, Lejeune, Aurelie, Levi, Leon, Lightfoot, Roger, Lingsma, Hester, Maas, Andrew I.R., Maegele, Marc, Majdan, Marek, Manara, Alex, Manley, Geoffrey, Maréchal, Hugues, Martino, Costanza, Mattern, Julia, McMahon, Catherine, Melegh, Béla, Menon, David, Menovsky, Tomas, Mikolic, Ana, Misset, Benoit, Muraleedharan, Visakh, Murray, Lynnette, Nair, Nandesh, Negru, Ancuta, Nelson, David, Newcombe, Virginia, Nieboer, Daan, Nyirádi, József, Oresic, Matej, Ortolano, Fabrizio, Otesile, Olubukola, Palotie, Aarno, Parizel, Paul M., Payen, Jean-François, Perera, Natascha, Perlbarg, Vincent, Persona, Paolo, Peul, Wilco, Piippo-Karjalainen, Anna, Pirinen, Matti, Pisica, Dana, Ples, Horia, Polinder, Suzanne, Pomposo, Inigo, Posti, Jussi P., Puybasset, Louis, Rădoi, Andreea, Ragauskas, Arminas, Raj, Rahul, Rambadagalla, Malinka, Rehorčíková, Veronika, Helmrich, Isabel Retel, Rhodes, Jonathan, Richardson, Sylvia, Richter, Sophie, Ripatti, Samuli, Rocka, Saulius, Roe, Cecilie, Roise, Olav, Rosand, Jonathan, Rosenfeld, Jeffrey, Rosenlund, Christina, Rosenthal, Guy, Rossaint, Rolf, Rossi, Sandra, Rueckert, Daniel, Rusnák, Martin, Sahuquillo, Juan, Sakowitz, Oliver, Sanchez-Porras, Renan, Sandor, Janos, Schäfer, Nadine, Schmidt, Silke, Schoechl, Herbert, Schoonman, Guus, Schou, Rico Frederik, Schwendenwein, Elisabeth, Sewalt, Charlie, Skandsen, Toril, Smielewski, Peter, Sorinola, Abayomi, Stamatakis, Emmanuel, Stanworth, Simon, Kowark, Ana, Stevens, Robert, Stewart, William, Steyerberg, Ewout W., Stocchetti, Nino, Sundström, Nina, Takala, Riikka, Tamás, Viktória, Tamosuitis, Tomas, Taylor, Mark Steven, Ao, Braden Te, Tenovuo, Olli, Theadom, Alice, Thomas, Matt, Tibboel, Dick, Timmers, Marjolijn, Tolias, Christos, Trapani, Tony, Tudora, Cristina Maria, Unterberg, Andreas, Vajkoczy, Peter, Valeinis, Egils, Vallance, Shirley, Vámos, Zoltán, Van der Jagt, Mathieu, van der Naalt, Joukje, Van der Steen, Gregory, van Dijck, Jeroen T.J.M., van Essen, Thomas A., Van Hecke, Wim, van Heugten, Caroline, Van Praag, Dominique, Van Veen, Ernest, van Wijk, Roel, Vyvere, Thijs Vande, Vargiolu, Alessia, Vega, Emmanuel, Velt, Kimberley, Verheyden, Jan, Vespa, Paul M., Vik, Anne, Vilcinis, Rimantas, Volovici, Victor, von Steinbüchel, Nicole, Voormolen, Daphne, Vulekovic, Petar, Wang, Kevin K.W., Wiegers, Eveline, Williams, Guy, Wilson, Lindsay, Winzeck, Stefan, Wolf, Stefan, Yang, Zhihui, Ylén, Peter, Younsi, Alexander, Zeiler, Frederick A., Ziverte, Agate, Zoerle, Tommaso, van Erp, Inge A.M., Lingsma, Hester F., Pisică, Dana, Yue, John K., Singh, Ranjit D., Kolias, Angelos, Peppel, Lianne D., Heijenbrok-Kal, Majanka, Ribbers, Gerard M., Menon, David K., Hutchinson, Peter J.A., Manley, Geoffrey T., de Ruiter, Godard C.W., and Peul, Wilco C.
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- 2023
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186. Thermal Profiles for Focal Pulsed Electric Field Ablation
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Verma, Atul, Zhong, Princeton, Castellvi, Quim, Girouard, Steve, Mediratta, Vik, and Neal, Robert E., II
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- 2023
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187. Expanding standards in viromics: in silico evaluation of dsDNA viral genome identification, classification, and auxiliary metabolic gene curation
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Pratama, Akbar Adjie, Bolduc, Benjamin, Zayed, Ahmed A, Zhong, Zhi-Ping, Guo, Jiarong, Vik, Dean R, Gazitúa, Maria Consuelo, Wainaina, James M, Roux, Simon, and Sullivan, Matthew B
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Microbiology ,Biological Sciences ,Genetics ,2.2 Factors relating to the physical environment ,Aetiology ,Infection ,Benchmarks ,Standard operating procedure ,Viruses ,Viromics ,Ecology ,Medical and Health Sciences - Abstract
BackgroundViruses influence global patterns of microbial diversity and nutrient cycles. Though viral metagenomics (viromics), specifically targeting dsDNA viruses, has been critical for revealing viral roles across diverse ecosystems, its analyses differ in many ways from those used for microbes. To date, viromics benchmarking has covered read pre-processing, assembly, relative abundance, read mapping thresholds and diversity estimation, but other steps would benefit from benchmarking and standardization. Here we use in silico-generated datasets and an extensive literature survey to evaluate and highlight how dataset composition (i.e., viromes vs bulk metagenomes) and assembly fragmentation impact (i) viral contig identification tool, (ii) virus taxonomic classification, and (iii) identification and curation of auxiliary metabolic genes (AMGs).ResultsThe in silico benchmarking of five commonly used virus identification tools show that gene-content-based tools consistently performed well for long (≥3 kbp) contigs, while k-mer- and blast-based tools were uniquely able to detect viruses from short (≤3 kbp) contigs. Notably, however, the performance increase of k-mer- and blast-based tools for short contigs was obtained at the cost of increased false positives (sometimes up to ∼5% for virome and ∼75% bulk samples), particularly when eukaryotic or mobile genetic element sequences were included in the test datasets. For viral classification, variously sized genome fragments were assessed using gene-sharing network analytics to quantify drop-offs in taxonomic assignments, which revealed correct assignations ranging from ∼95% (whole genomes) down to ∼80% (3 kbp sized genome fragments). A similar trend was also observed for other viral classification tools such as VPF-class, ViPTree and VIRIDIC, suggesting that caution is warranted when classifying short genome fragments and not full genomes. Finally, we highlight how fragmented assemblies can lead to erroneous identification of AMGs and outline a best-practices workflow to curate candidate AMGs in viral genomes assembled from metagenomes.ConclusionTogether, these benchmarking experiments and annotation guidelines should aid researchers seeking to best detect, classify, and characterize the myriad viruses 'hidden' in diverse sequence datasets.
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- 2021
188. Development of a 3D Color Diagram for Improved Visual Grading System of Cotton
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Khan, Nayab, Vik, Michael, Irshad, Farida, Yildirim, Bekir, Farooq, Assad, and Ashraf, Muhammad Azeem
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- 2023
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189. Fairness in Artificial Intelligence: Regulatory Sanbox Evaluation of Bias Prevention for ECG Classification
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Ranjbar, Arian, primary, Skolt, Kristin, additional, Aakenes Vik, Kathinka Theodore, additional, Sletvold Øistad, Beate, additional, Wermundsen Mork, Eilin, additional, and Ravn, Jesper, additional
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- 2023
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190. Nationally Shared Medication Lists – Describing Systems in the Nordic Countries
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Hammar, Tora, primary, Bergmo, Trine S., additional, Bülow, Cille, additional, Clausen, Stine S., additional, Manskow, Unn Sollid, additional, Timonen, Johanna, additional, and Jøsendal, Anette Vik, additional
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- 2023
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191. The Urinary Microbiome
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Tailor, Visha, primary, Bhide, Alka, additional, and Khullar, Vik, additional
- Published
- 2023
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192. History and Examination
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Khullar, Vik, primary and Tailor, Visha, additional
- Published
- 2023
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193. Does Food and Health Education in School Influence Students' Everyday Life?
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Beinert, Cecilie, Sørlie, Anne Cathrine, Åbacka, Gun, Palojoki, Päivi, and Vik, Frøydis Nordgård
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Objective: The Norwegian National Action Plan for a Healthier Diet calls for discussion of new ways to communicate health information. An already established and important arena in which to do so is school, in the Food and Health (FH) subject in particular. The aim of this study was to investigate how Norwegian students experience the FH subject, and how they believe it impacts on their everyday lives. Design: Qualitative study using focus group discussions. Setting: Three public schools in Norway. Methods: Focus group discussions were audio-recorded, transcribed verbatim and thematically analysed. Results: The students reported the relevance of the school subject FH to their everyday life. However, how much FH was experienced as having impacted on their everyday lives with respect to cooking at home, food choice and food hygiene varied. Conclusions: More research is needed to explore how FH can have a stronger impact on students' actual food choices and cooking practices. This is important in order to tackle contemporary dietary challenges among children and adolescents. Rather than discussing new channels of health education, we suggest that the FH subject area should be strengthened in schools by increasing teachers' competence and focusing more strongly on how best to influence students' food choices.
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- 2022
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194. 'Quiero 'Juks'ar en La 'Julaften'ito' -- Playfulness and Metalinguistic Awareness in Translingual Family Interactions
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Johnsen, Ragni Vik
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This article explores playfulness and creativity in translingual family interactions. In particular, it focuses on how and to what ends adolescents mobilize multilingual resources in family interactions. It investigates the cases of two multilingual families with adolescent children (13-18 years old). The families have different linguistic backgrounds, but have in common that one of the parents have migrated from a Spanish-speaking Latin-American country to Northern-Norway, and that Spanish represents a linguistic resource and a heritage language in the families. The data consists of self-recorded family interactions (29 recordings, ca. 5 h.) and were collected over the course of one year. By analysing interactions where the adolescents employ Spanish features, the article offers insights into how adolescents negotiate the position of the heritage language Spanish in the family. A close, turn-by-turn analysis demonstrates that the adolescents in a creative and playful manner employ a multitude of linguistic resources to fulfil interactional achievements: Through metalinguistic talk and playful translingual practices, the adolescents challenge and negotiate identities and family roles, exert agencies, and demonstrate metalinguistic awareness and sociolinguistic control.
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- 2022
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195. Embarking on an Adventure: Exploring Counselor-In-Training Meaning-Making through Adventure-Based Education
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Lindsay M. Vik
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The clinical integration of adventure within counseling and other therapeutic environments is well researched (Delaney, 2020; Gass et al., 2021; Schoel & Maizell, 1988). Similarly, the use of adventure education has demonstrated active exploration of course content, intrapersonal awareness, and interpersonal experiences (Christian et al., 2021; Duffy et al., 2020). Despite the overlaps between the therapeutic and educational application of adventure, we see a distinct lack of research exploring the integration and impact of adventure-based education in training programs for counselors-in-training (CITs). This present study will explore the lived experiences of CITs from Council for Accreditation of Counselor and Related Educational Programs (CACREP, 2016) in the United States, that have engaged in adventure-based education activities within their counseling courses. This qualitative study will utilize Interpretative Phenomenological Analysis to explore these experiences and seeks to develop unique understanding of how CITs were impacted by outdoor adventure within their courses. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]
- Published
- 2022
196. "One thing I'd never stand for in a relationship is violence, so when she tried to kill me, that was it" : the impact of heteronormativity and assimilation on Domestic Violence and Abuse in same sex women's relationships
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Kelly-Teare, Vik, Morgan, Angela, and Paniagua, Hilary
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domestic violence ,lesbian ,same sex ,feminism ,women ,identity ,heteronormativity - Abstract
Domestic Violence and Abuse (DVA) is most commonly spoken of as a heterosexual issue and as such it remains hidden within the lesbian community both from the inside and the outside. In the era following civil partnership and same sex marriage legislation, it may be logical to assume that speaking out about abuse would be easier. However, this study suggests that the politics of assimilation has entrenched the hidden nature of domestic violence and abuse in same sex relationships between women making it more and more difficult to recognise or speak out about. Whilst recent research in the area has highlighted these issues, this study foregrounds, through the women’s lived experience, the importance of structural, social and cultural contexts for women’s identities resulting in limited recognition of abuse and consequential action on it. The study contributes to the developing and existing body of literature through the exploration of the impact of heteronormativity on domestic violence and abuse in relationships between women in a specific age cohort (of one generation) who identify as gay. The results are presented in a narrative ethnographic thematic form, providing three women’s in-depth stories of experiencing and surviving abusive relationships. From within these stories, it focuses on the use of identity in abuse, set against the backdrop of increasing political, legislative and social assimilation. Using the COHSAR Power and Control Wheel to inform the coding framework the study presents a theoretical conceptualisation of physical and emotional abuse as coercive control and focuses on the difference of experience. The results enabled a theoretical conceptualisation of identity abuse and enabled the development of a new model for understanding identity abuse in relation to intersectional identities. Four key tactics areas emerged in relation to identity abuse: the known self (personal and public identity), intimacies, threats and false allegations. These key tactical areas are weaponised in personal, social and cultural, and structural domains of life. The critical inquiry presented is methodologically grounded in analytic autoethnography (with the researcher as full member participant) and utilises standpoint theory and intersectionality as conceptual framework. The study promotes the use of a new practitioner and educator model for understanding identity abuse to be used in conjunction with the COHSAR Power and Control Wheel and the stories themselves may also be used as tools for learning. In an era of assimilation, research on the lived experience of domestic violence and abuse is key in understanding the nuances of experience based on identity; without this, practitioners and educators are limited in their ability to resource, raise awareness of, and assist those experiencing domestic violence and abuse.
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- 2020
197. The Prevalence and Stability of Sleep-Wake Disturbance and Fatigue throughout the First Year after Mild Traumatic Brain Injury
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Saksvik, Simen Berg, Karaliute, Migle, Kallestad, Håvard, Follestad, Turid, Asarnow, Robert, Vik, Anne, Håberg, Asta Kristine, Skandsen, Toril, and Olsen, Alexander
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Biomedical and Clinical Sciences ,Cardiovascular Medicine and Haematology ,Psychology ,Biomedical Imaging ,Traumatic Brain Injury (TBI) ,Clinical Research ,Physical Injury - Accidents and Adverse Effects ,Neurosciences ,Brain Disorders ,Traumatic Head and Spine Injury ,Sleep Research ,Injuries and accidents ,Adolescent ,Adult ,Brain Concussion ,Fatigue ,Female ,Humans ,Longitudinal Studies ,Male ,Middle Aged ,Prevalence ,Prospective Studies ,Sleep Wake Disorders ,Young Adult ,fatigue ,hypersomnia ,insomnia ,mild traumatic brain injury ,sleep-wake disturbances ,Clinical Sciences ,Neurology & Neurosurgery ,Clinical sciences ,Biological psychology - Abstract
In this prospective, longitudinal study, we aimed to determine the prevalence and stability of sleep-wake disturbance (SWD) and fatigue in a large representative sample of patients (Trondheim mild traumatic brain injury [mTBI] follow-up study). We included 378 patients with mTBI (age 16-60), 82 matched trauma controls with orthopedic injuries, and 83 matched community controls. Increased sleep need, poor sleep quality, excessive daytime sleepiness, and fatigue were assessed at 2 weeks, 3 months, and 12 months after injury. Mixed logistic regression models were used to evaluate clinically relevant group differences longitudinally. Prevalence of increased sleep need, poor sleep quality, and fatigue was significantly higher in patients with mTBI than in both trauma controls and community controls at all time points. More patients with mTBI reported problems with excessive daytime sleepiness compared to trauma controls, but not community controls, at all time points. Patients with complicated mTBI (intracranial findings on computed tomography or magnetic resonance imaging) had more fatigue problems compared to those with uncomplicated mTBI, at all three time points. In patients with mTBI who experienced SWDs and fatigue 2 weeks after injury, around half still had problems at 3 months and approximately one third at 12 months. Interestingly, we observed limited overlap between the different symptom measures; a large number of patients reported one specific problem with SWD or fatigue rather than several problems. In conclusion, our results provide strong evidence that mTBI contributes significantly to the development and maintenance of SWDs and fatigue.
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- 2020
198. New Kids on the Block: Immature Myeloid Cells in Intestinal Regeneration
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Vik Meadows and Nan Gao
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Diseases of the digestive system. Gastroenterology ,RC799-869 - Published
- 2024
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199. User-Controlled Personal Assistance for Children—Does the Independent Living Ideology Translate to the Lived Life of Children and Youth with Disabilities?
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Øyvind Ibrahim Marøy Snipstad and Stine Vik
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personal assistance ,independent living ,children with disabilities ,family institutions ,self-determination ,Social sciences (General) ,H1-99 - Abstract
In Norway, user-controlled personal assistance (UPA) is a right for children under the age of 18. Based on the independent living (IL) ideology, the intention of UPA is to provide the person with user control, independence and more. However, in order to receive UPA, minors need an external actor to be formally in charge. Through a qualitative approach, this article discusses whether the ideological principles governing UPA can be utilised as intended in families where the parent is expected both to care for and protect the child as well as act as an administrator providing opportunities for the child to enjoy the IL principles. The findings in this article suggest that there may be a need to revise the ideological framework in order to better encompass the reality of childhood. Instead of full user control at present, UPA could be a viewed as an empowering tool in the process towards future independence.
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- 2023
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200. Barriers to and facilitators of effective management of fever episodes in hospitalised Kenyan children with cancer: protocol for convergent mixed methods study
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Sandra Langat, Festus Njuguna, Gilbert Olbara, Terry Vik, Charles Nathaniel Nessle, Julia Dettinger, Raphael Koima, Lenah Nyamusi, Evelynn Kisembe, Sarah Kinja, Mercy Ndung’u, Dennis Njenga, and Cheryl Moyer
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Medicine - Abstract
Introduction Febrile neutropenia is an oncological emergency in children with cancer, associated with serious infections and complications. In low-resourced settings, death from infections in children with cancer is 20 times higher than in high-resourced treatment settings, thought to be related to delays in antibiotic administration and management. The barriers to effective management of fever episodes in children with cancer have not previously been described. This convergent mixed-methods study will provide the evidence to develop fever treatment guidelines and to inform their effective implementation in children with cancer at Moi Teaching and Referral Hospital (MTRH), a level 6 referral hospital in western Kenya.Methods and analysis Prospective data collection of paediatric patients with cancer with new fever episodes admitted to MTRH will be performed during routine treatment. Clinical variables will be collected from 50 fever episodes, including cancer diagnosis and infectious characteristics of the fever episode, and elapsed time from fever onset to various milestones in the management workflow. Semistructured qualitative interviews with healthcare providers (estimated 20 to reach saturation) will explore the barriers to and facilitators of appropriate management of fever episodes in children with cancer. The interview guide was informed by a theoretical framework and Consolidated Framework for Implementation Research. A mixed-methods analysis use of joint display tables and process mapping will link and integrate the two types of data with meta-inferences.Ethics and dissemination Institutional review board approval was obtained from the MTRH (0004273) and the University of Michigan (HUM0225674), and the study was registered with National Commission for Science Technology and Innovation (P/23/22885). Written consent will be obtained from all participants. Results will be formally shared with local and national policy leadership and local end users, presented at relevant national academic conferences and submitted for publication in a peer-reviewed journal.
- Published
- 2023
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