| 3541. |
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| 3542. |
- Sundström, Björn, 1968-, et al.
(författare)
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Exercise habits among patients with ankylosing spondylitis : A questionnaire based survey in the County of Västerbotten, Sweden
- 2002
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Ingår i: Scandinavian Journal of Rheumatology. - 0300-9742 .- 1502-7732. ; 31:3, s. 163-167
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: This study aimed at evaluating exercise habits among patients with ankylosing spondylitis, their clinical status and what mainly restrains these patients from exercising.METHODS: In a cross-sectional design study 189 patients completed a self-administrated questionnaire regarding their exercise habits and their clinical status.RESULTS: A majority of the patients reported that they performed exercises. The most popular form of exercise was walking. Pool exercise was perceived to relieve the symptoms more than any other exercise and was also rated as the most enjoyable form of exercise. The main obstacle to exercise was lack of time, followed by fatigue. A small number of patients experienced aggravation of symptoms with exercise.CONCLUSION: A majority of AS patients exercise, although the frequency of the exercise was low for many patients. The main obstacle to exercise was lack of time and fatigue.
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| 3543. |
- Sundström, Gunnel, et al.
(författare)
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Localisation and distribution of hyaluronan in normal bone marrow matrix : a novel method to evaluate impending fibrosis?
- 2002
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Ingår i: European Journal of Haematology. - : Wiley. - 0902-4441 .- 1600-0609. ; 68:4, s. 194-202
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Tidskriftsartikel (refereegranskat)abstract
- Bone marrow trephine biopsies from 30 healthy volunteers, 10 men and 20 women aged 18-60 yr were obtained for identification and localisation of hyaluronan (HYA). Fixation, decalcification and embedding were performed by two different methods, with identical results in both. For comparison bone marrow trephine biopsies from three patients with different haematological diseases and known fibrosis were studied. All bone marrow specimens were also stained for reticulin grading. HYA was found in the bone marrow specimens from healthy individuals in a pattern that was concordant with the reticulin staining, the common way of visualising bone marrow fibrosis. In bone marrow from the patients with known fibrosis the HYA and reticulin staining were both more intense and abundant. Interestingly, HYA was also found intracellularly in eosinophilic cells in normal bone marrow. HYA is a polysaccharide unique both in structural and biological properties, and in excess it may predict bone marrow fibrosis.
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| 3544. |
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| 3545. |
- Sundström, Pär
(författare)
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Nagel's case against physicalism
- 2002
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Ingår i: Sats: Nordic Journal of Philosophy. ; 3:2, s. 91-108
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Tidskriftsartikel (refereegranskat)
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| 3546. |
- Sundström (Raman), Manya, 1971-
(författare)
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Coordinating informal and formal aspects of mathematics : student behavior and textbook messages
- 2002
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Ingår i: Journal of Mathematical Behavior. - 0732-3123 .- 1873-8028. ; 21:2, s. 135-150
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Tidskriftsartikel (refereegranskat)abstract
- In this paper I illustrate difficulties students have coordinating informal and formal aspects of mathematics. I also discuss two ways in which precalculus and calculus textbooks treat mathematics that may make this coordination difficult: emphasizing the informal at the expense of the formal and emphasizing the formal at the expense of the informal. By looking at student difficulties in light of textbook treatments, we see evidence that student difficulties are not merely developmental. Students are not given many opportunities to make the kinds of connections which, while difficult, are an essential component of mathematical thinking.
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| 3547. |
- Sundström (Raman), Manya, 1971-
(författare)
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Epistemological messages conveyed by three high school and college mathematics textbooks
- 2004
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Ingår i: Journal of Mathematical Behavior. - : Elsevier BV. - 0732-3123 .- 1873-8028. ; 23:4, s. 389-404
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Tidskriftsartikel (refereegranskat)abstract
- Mathematics textbooks embody a particular set of assumptions about mathematics or the mathematics intended for students at a particular level. Thus, an epistemological analysis of textbooks can provide some context for understanding, for example, the difficulties many students encounter when moving from high-school to collegiate mathematics. In this study, we consider how typical pre-calculus, calculus, and analysis texts treat the topic of continuity. We find that these texts send conflicting messages regarding the status and purpose of mathematical definitions.
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| 3548. |
- Sundström (Raman), Manya, 1971-
(författare)
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Key ideas : What are they and how can they help us understand people view proof?
- 2003
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Ingår i: Educational Studies in Mathematics. - 0013-1954 .- 1573-0816. ; 52:3, s. 319-325
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Tidskriftsartikel (refereegranskat)abstract
- This paper examines the views of proof held by university level mathematics students and teachers. A framework is developed for characterizing people's views of proof, based on a distinction between public and private aspects of proof and the key ideas which link these two domains.
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| 3549. |
- Sunesson, Anna-Lena, et al.
(författare)
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Passive sampling in combination with thermal desorption and gas chromatography as a tool for self-assessment of chemical exposure
- 2002
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Ingår i: Journal of Environmental Monitoring. - : Royal Society of Chemistry. - 1464-0325 .- 1464-0333. ; 4:5, s. 706-710
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Tidskriftsartikel (refereegranskat)abstract
- Diffusive samplers for monitoring of air quality are user-friendly devices that can normally be operated by the user himself. Hence these samplers are suitable for self-assessment. Practical and work organisational aspects of self-assessment of chemical exposure were studied in different occupational settings. It was found that the diffusive sampler used in these studies, the Perkin-Elmer tube in combination with thermal desorption, worked well for the purpose and could be correctly handled by the individuals using it. The results from self-assessments agreed well with expert measurements carried out by an occupational hygienist. However, in order to obtain a sustainable system of self-assessment strong organizational support is needed.
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| 3550. |
- Sunnegårdh-Grönberg, Karin, 1969-, et al.
(författare)
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Flexural strength and modulus of a novel ceramic restorative cement intended for posterior restorations as determined by a three-point bending test
- 2003
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Ingår i: Acta Odontologica Scandinavica. - : Taylor & Francis. - 0001-6357 .- 1502-3850. ; 61:2, s. 87-92
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to compare a new restorative cement intended for posterior restorations, Doxadent, with other types of tooth-colored materials as regards flexural strength and flexural modulus. The new restorative material consists mainly of calcium aluminate. Four hybrid resin composites, one polyacid-modified resin composite, one resin-modified glass ionomer cement, one conventional glass ionomer cement, one zinc phosphate cement, and an experimental version as well as the marketed version of Doxadent were investigated. Flexural strength and flexural modulus were tested according to ISO standard 4049 and determined after 1 d, 1 week, and 2 weeks. Together with the zinc phosphate cement, Doxadent had the lowest flexural strengths (13-22 MPa). The strongest materials were the resin composites and the polyacid-modified resin composite (83-136 MPa). The highest flexural modulus was found for Doxadent (17-19 GPa). The flexural strength of Doxadent decreased significantly from 1 week to 2 weeks, while flexural modulus remained unchanged. The other materials reacted in different ways to prolonged water storage. It can be concluded that the restorative cement Doxadent had significantly lower flexural strength and significantly higher flexural modulus than today's materials used for direct posterior restorations.
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