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- Arvidsson, Anna, 1973, et al.
(författare)
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Comparing and visualizing titanium implant integration in rat bone using 2D and 3D techniques
- 2015
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Ingår i: Journal of Biomedical Materials Research. Part B - Applied biomaterials. - : Wiley. - 1552-4973 .- 1552-4981. ; 103:1, s. 12-20
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Tidskriftsartikel (refereegranskat)abstract
- The aim was to compare the osseointegration of grit-blasted implants with and without a hydrogen fluoride treatment in rat tibia and femur, and to visualize bone formation using state-of-the-art 3D visualization techniques. Grit-blasted implants were inserted in femur and tibia of 10 Sprague-Dawley rats (4 implants/rat). Four weeks after insertion, bone implant samples were retrieved. Selected samples were imaged in 3D using Synchrotron Radiation-based CT (SRCT). The 3D data was quantified and visualized using two novel visualization techniques, thread fly-through and 2D unfolding. All samples were processed to cut and ground sections and 2D histomorphometrical comparisons of bone implant contact (BIC), bone area (BA), and mirror image area (MI) were performed. BA values were statistically significantly higher for test implants than controls (p<0.05), but BIC and MI data did not differ significantly. Thus, the results partly indicate improved bone formation at blasted and hydrogen fluoride treated implants, compared to blasted implants. The 3D analysis was a valuable complement to 2D analysis, facilitating improved visualization. However, further studies are required to evaluate aspects of 3D quantitative techniques, with relation to light microscopy that traditionally is used for osseointegration studies. (c) 2014 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 103B: 12-20, 2015.
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| 3. |
- Arvidsson, Daniel, 1974, et al.
(författare)
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A Longitudinal Analysis of the Relationships of Physical Activity and Body Fat With Nerve Growth Factor and Brain-Derived Neural Factor in Children
- 2018
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Ingår i: Journal of Physical Activity & Health. - : Human Kinetics. - 1543-3080 .- 1543-5474. ; 15:8, s. 620-625
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Tidskriftsartikel (refereegranskat)abstract
- Background: Nerve growth factor (NGF) and brain-derived neural factor (BDNF) are important for brain function and detectable in the blood. This study explored the longitudinal associations of physical activity and body fat with serum NGF and BDNF in children. Methods: Two waves of measurements were performed 2 years apart in 8- to 11-year-old children, including physical activity using the ActiGraph model 7164, body composition by dual-energy X-ray absorptiometry, and serum NGF and BDNF determined by multiplex immunoassay. The first wave included 248 children. Full information maximum likelihood estimation with robust standard errors was applied in structural equation modeling. Results: Vigorous physical activity showed a direct positive longitudinal relationship with NGF (standardized coefficient beta = 0.30, P = .01) but not with BDNF (beta = 0.04, P = .84). At the same time, body fat percentage was positively related to both NGF (beta = 0.59, P < .001) and BDNF (beta = 0.17, P = .04). There was an indication of an indirect relationship of vigorous physical activity with NGF (product of unstandardized coefficient beta = -0.18, P = .02) and BDNF (beta = -0.07, P = .05) through the negative relationship with body fat percentage (beta = -0.36, P < .001). Conclusions: Vigorous physical activity is directly related to serum NGF and indirectly through the level of body fat. The relationships with serum BDNF are more complex.
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| 4. |
- Arvidsson, Louise, et al.
(författare)
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Bidirectional associations between psychosocial well-being and adherence to healthy dietary guidelines in European children: prospective findings from the IDEFICS study
- 2017
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Ingår i: Bmc Public Health. - : Springer Science and Business Media LLC. - 1471-2458. ; 17:1
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Tidskriftsartikel (refereegranskat)abstract
- Background: In children the relationship between a healthy diet and psychosocial well-being has not been fully explored and the existing evidence is inconsistent. This study investigates the chronology of the association between children's adherence to healthy dietary guidelines and their well-being, with special attention to the influence of weight status on the association. Methods: Seven thousand six hundred seventy five children 2 to 9 years old from the eight-country cohort study IDEFICS were investigated. They were first examined between September 2007 and June 2008 and re-examined again 2 years later. Psychosocial well-being was measured using self-esteem and parent relations questions from the KINDL (R) and emotional and peer problems from the Strengths and Difficulties Questionnaire. A Healthy Dietary Adherence Score (HDAS) was calculated from a 43-item food frequency questionnaire as a measure of the degree to which children's dietary intake follows nutrition guidelines. The analysis employed multilevel logistic regression (country as random effect) with bidirectional modeling of dichotomous dietary and well-being variables as both exposures and outcomes while controlling for respective baseline values. Results: A higher HDAS at baseline was associated with better self-esteem (OR 1.2, 95% CI 1.0; 1.4) and fewer emotional and peer problems (OR 1.2, 95% CI 1.1; 1.3 and OR 1.3, 95% CI 1.2; 1.4) 2 years later. For the reversed direction, better self-esteem was associated with higher HDAS 2 years later (OR 1.1 95% CI 1.0; 1.29). The analysis stratified by weight status revealed that the associations between higher HDAS at baseline and better well-being at follow-up were similar in both normal weight and overweight children. Conclusion: Present findings suggest a bidirectional relation between diet quality and self-esteem. Additionally, higher adherence to healthy dietary guidelines at baseline was associated with fewer emotional and peer problems at follow-up, independent of children's weight status.
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| 6. |
- Arvidsson, Matilda, 1976, et al.
(författare)
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Law and Disorder in the Postcolony? Law, Missionaries, and the Utopias of Pre-colonial to Present-day Kongo DRC
- 2022
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Ingår i: Law and Society Association Annual Meeting 2022.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Our panel turns to history to understand challenges to law and order in the present; examining the present-day ‘failed state’ of the Democratic Republic of the Congo (DRC). Drawing on unique archival material, centring on the activities of Mission Covenant Church of Sweden (Svenska Missionskyrkan) in lower Congo, 1881–1961, we take on the well-established thesis that ‘disorder’ in the contemporary ‘postcolony’ flows from how the introduction of law and order was pursued during the pre-colonial and colonial era. In this panel Christian and Global North contributions towards the establishment of the Rule of Law, as well as the international legal interests and investments, in contemporary Congo DRC are examined through critical international legal, social-anthropological, and historical trajectories.
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| 7. |
- Arvidsson, Matilda, 1976, et al.
(författare)
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The Past as Present: Law, Anthropology and History
- 2022
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Ingår i: The Past as Present: Research project on past and present legal fragmentation in the Kongo/DRC.
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- This site communicates the findings and activities in our project. In our project we turn to history in order to better understand challenges to law and order in our present time; specifically, examining the present-day fragmented and ‘failed state’ of Congo (DRC), often described as lacking in terms of the Rule of Law and adequate legal institutions is re-examined in light of the rule of law activities pursued in the lower Congo by Swedish missionaries from the Mission Covenant Church of Sweden (Svenska Missionskyrkan), 1881-1961. Following the well-established thesis that ‘disorder’ in the contemporary ‘postcolony’ flows from how the introduction of law and order was pursued during the pre-colonial and colonial era, our project revisits the Swedish contribution to the establishment of the Rule of Law in contemporary DRC, in order to better understand legal fragmentation and pluralism was introduced in the pre-colonial and colonial era. We draw on unique archival material, as well as contemporary empirical data, with the aim to develop a substantiated holistic approach to legal fragmentation and state state-building initiatives in the contemporary DRC.
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| 8. |
- Arvidsson, Thomas, et al.
(författare)
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Autism in 3-6-Year-Old Children in a Suburb of Goteborg, Sweden
- 1997
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Ingår i: Autism. - : SAGE Publications. - 1362-3613 .- 1461-7005. ; 1:2, s. 163-173
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Tidskriftsartikel (refereegranskat)abstract
- 1941 ofthe 3-6-year-old children living in a community outside Gbteborg on the Swedish west coast were screened with a view to identifying all individuals with severe degrees of autistic behaviour. All children in the population were known to well baby clinic staff, and any child suspected of suffering from autism was referred to a specialized clinical research team. The nurses and doctors working in the well baby clinics were well informed about autism. Clinical and ADI-R diagnoses of autism were established after thorough clinical assessments of each suspected case. All children were seen at least twice, and all were over the age of 3 years at the time of diagnosis. The general population prevalence for autism was 3 I in I o,ooo children (9; percent confidence interval 7/ g;). Classic Kanner autism was found in I o in Io,ooo children (9; percent confidence interval-4/24). These rates appear to reflect higher rates than previously reported. Some reasons for the possibly higher prevalence are discussed.
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| 9. |
- Brond, J. C., et al.
(författare)
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Generating ActiGraph Counts from Raw Acceleration Recorded by an Alternative Monitor
- 2017
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Ingår i: Medicine and Science in Sports and Exercise. - : Ovid Technologies (Wolters Kluwer Health). - 0195-9131. ; 49:11, s. 2351-2360
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: This study aimed to implement an aggregation method in Matlab for generating ActiGraph counts from raw acceleration recorded with an alternative accelerometer device and to investigate the validity of the method. Methods: The aggregation method, including the frequency band-pass filter, was implemented and optimized based on standardized sinusoidal acceleration signals generated in Matlab and processed in the ActiLife software. Evaluating the validity of the aggregation method was approached using a mechanical setup and with a 24-h free-living recording using a convenient sample of nine subjects. Counts generated with the aggregation method applied to Axivity AX3 raw acceleration data were compared with counts generated with ActiLife from ActiGraph GT3X+ data. Results: An optimal band-pass filter was fitted resulting in a root-mean-square error of 25.7 counts per 10 s and mean absolute error of 15.0 counts per second across the full frequency range. The mechanical evaluation of the proposed aggregation method resulted in an absolute mean +/- SD difference of -0.11 +/- 0.97 counts per 10 s across all rotational frequencies compared with the original ActiGraph method. Applying the aggregation method to the 24-h free-living recordings resulted in an epoch level bias ranging from -16.2 to 0.9 counts per 10 s, a relative difference in the averaged physical activity (counts per minute) ranging from -0.5% to 4.7% with a group mean +/- SD of 2.2% +/- 1.7%, and a Cohen' s kappa of 0.945, indicating almost a perfect agreement in the intensity classification. Conclusion: The proposed band-pass filter and aggregation method is highly valid for generating ActiGraph counts from raw acceleration data recorded with alternative devices. It would facilitate comparability between studies using different devices collecting raw acceleration data.
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| 10. |
- Brond, J. C., et al.
(författare)
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Simple Method for the Objective Activity Type Assessment with Preschoolers, Children and Adolescents
- 2020
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Ingår i: Children. - : MDPI AG. - 2227-9067. ; 7:7
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Tidskriftsartikel (refereegranskat)abstract
- Background:The objective and accurate assessment of children's sedentary and physical behavior is important for investigating their relation to health. The purpose of this study is to validate a simple and robust method for the identification of sitting, standing, walking, running and biking performed by preschool children, children and adolescents in the age from 3 to 16 years from a single thigh-worn accelerometer.Method:A total of 96 children were included in the study and all subjects followed a structured activity protocol performed in the subject's normal kindergarten or school environment. Thigh acceleration was measured using the Axivity AX3 (Axivity, Newcastle, UK) device. Method development and accuracy was evaluated by equally dividing the subjects into a development and test group.Results:The sensitivity and specificity for identifying sitting and standing was above 99.3% and for walking and running above 82.6% for all age groups. The sensitivity and specificity for identifying biking was above 85.8% for children and adolescents and above 64.8% for the preschool group using running bikes.Conclusion:The accurate assessment of sitting, standing, walking, running and biking from thigh acceleration and with children in the age range of 3 to 16 is valid, although not with preschool children using running bikes.
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