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  • 101.
    Juter, Kristina
    et al.
    Kristianstad University College, Department of Mathematics and Science.
    Grevholm, Barbro
    Kristianstad University College, Department of Mathematics and Science.
    Limits and infinity: a study of university students' performance2007In: Relating practice and research in mathematics education: proceedings of NORMA 05, Fourth Nordic Conference on Mathematics Education, Trondheim, 2nd-6th September 2005 / [ed] Bergsten, C., Grevholm, B., Måsøval, Rønning, F., Trondheim: Tapir Academic Press , 2007, p. 337-348Conference paper (Other academic)
  • 102.
    Juter, Kristina
    et al.
    Kristianstad University, Department of Mathematics and Science.
    Jacobsson-Åhl, Teresia
    Kristianstad University, Department of Mathematics and Science.
    Sommarskolan i Klagenfurt2003In: Nämnaren, ISSN 0348-2723, Vol. 30, no 4, p. 57-59Article in journal (Other (popular science, discussion, etc.))
  • 103.
    Kjellin, Harald
    Kristianstad University, Department of Mathematics and Science.
    Estimating the relevance of numerical measures: combining the efficiency of automated measurements with manual verifications of relevance2006In: Knowledge in organizations. 1: foundations and methodologies, development and design, applications and integration / [ed] Sven Carlsson, Björn Cronquist, Harald Kjellin, Benkt Wangler, Skövde: Univ. , 2006, , p. 214p. 69-75Chapter in book (Other academic)
  • 104.
    Ledström, Maria
    et al.
    Kristianstad University College, Department of Mathematics and Science.
    Svensson, Andreas
    Kristianstad University College, Department of Mathematics and Science.
    Lantbruksbaserad biogasproduktion - miljö- och energivinster2005Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Klimatförändringar i världen är ett stort problem där alla måste hjälpa till för att stävja dess inverkan på vår livsföring. Ett problem är utsläppen av växthusgaser där djurhållningen står för en viss del. Vid djurhållning sker det en avgång av metangas både genom matsmältning och genom gödselproduktion där endast den sistnämnda är påverkbar till en rimlig kostnad. För att beräkna avgången av metan från djurhållningen i Helsingborgs stad måste man göra en inventering av djurantalet. Ett bra sätt för att utvinna metangas ur gödseln är att röta den och sedan förbränna den till koldioxid och vatten. Även koldioxid är en växthusgas men metan bidrar 21 gånger mer till växthuseffekten än koldioxid. Det som blir kvar efter rötningen är en god växtnäring med ett större växtvärde än stallgödsel. Om en lantbrukare investerar i en biogasanläggning kan detta innebära stora energivinster respektive miljövinster. Det som är viktigt att tänka på är anläggningens storlek i förhållande till energianvändningen på lantbruket. Investeringskostnaden är stor men vinsten blir positiv för en stor djurproducent.

    Miljövinsterna är många, minskning av växthusgaser och mindre övergödning vilket även är bra för ekonomin.

  • 105.
    Lindahl, Britt
    Kristianstad University, Department of Mathematics and Science.
    Hur ska vi få fler att välja naturvetenskap och teknik?2004In: Krut : kritisk utbildningstidskrift, ISSN 0347-5409, Vol. 114, no 2, p. 64-72Article in journal (Other academic)
  • 106.
    Lindahl, Britt
    Kristianstad University, Department of Mathematics and Science. Kristianstad University, Research environment Learning in Science and Mathematics (LISMA).
    Lust att lära naturvetenskap och teknik?: en longitudinell studie om vägen till gymnasiet2003Doctoral thesis, monograph (Other academic)
    Abstract [en]

    The aim of the study was to follow a group of pupils from the age of twelve until they leave lower secondary school at the age of sixteen to describe and analyse how their attitudes towards and intere... mer st in science and technology develop and change but also how this and other factors such as ability, understanding of scientific concepts, gender and home background influenced their choice for upper secondary school. The sample consists of 80 pupils, the whole age group in a school. Data was collected using observations, interviews and questionnaires. The analysis built on the theory of planned behaviour and conceptions research. Many pupils have a positive attitude towards science but often a more positive attitude towards other subjects. They have duties to their parents but these are not strongly expressed. Their self-efficacy for science follows the same pattern as their attitude; they think they are good in science but not as good as in other subjects. For most pupils it seems as if attitude together with self-efficacy are the strongest determinant for their choice. These determinants are influenced by different factors. Girls and boys perceive science teaching differently but it seems as if the boys are on their way to developing the same critical attitude as the girls have had since long ago. The social background is important as many of the pupils who choose science are from well educated homes but even this group is loosing interest. Good ability is a necessary factor but does not guarantee science will be chosen. Neither has good conceptual understanding a crucial importance but on the other hand there are many pupils who say that they would not choose science as they do not understand science in the way it is taught. Another finding is that many pupils even at Grade 5 have an idea of their future career which later on is the same as their choice for upper secondary. If science shall have a chance in their lives the pupils must have a positive experience of science from the beginning of primary school through all years. Once they have lost their interest it is very difficult to get them back. The competition for their attention is intensive and the older they get the more difficult it will be to catch their interest and allegiance.

  • 107.
    Lindahl, Odd
    et al.
    Kristineberg Marine Research Station.
    Hart, Rob
    SLU, Uppsala.
    Hernroth, Bodil
    Kristineberg Marine Research Station.
    Kollberg, Sven
    Kristineberg Marine Research Station.
    Loo, Lars-Ove
    Göteborg University, Tjärnö Marine Biological Laboratory.
    Olrog, Lars
    Naturbruksgymnasiet i Dingle.
    Rehnstam-Holm, Ann-Sofi
    Kristianstad University, Department of Mathematics and Science.
    Svensson, Jonny
    Thalassos Computations, Lindome.
    Svensson, Susanne
    Tjärnö Marine Biological Laboratory.
    Syversen, Ulf
    Østfold Sustainable Development.
    Improving marine water quality by mussel farming: a profitable solution for Swedish society2005In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 34, no 2, p. 131-138Article in journal (Refereed)
    Abstract [en]

    Eutrophication of coastal waters is a serious environmental problem with high costs for society globally. In eastern Skagerrak, reductions in eutrophication are planned through reduction of nitrogen inputs, but it is unclear how this can be achieved. One possible method is the cultivation of filter-feeding organisms, such as blue mussels, which remove nitrogen while generating seafood, fodder and agricultural fertilizer, thus recycling nutrients from sea to land. The expected effect of mussel farming on nitrogen cycling was modeled for the Gullmar Fjord on the Swedish west coast and it is shown that the net transport of nitrogen (sum of dissolved and particulate) at the fjord mouth was reduced by 20%. Existing commercial mussel farms already perform this service for free, but the benefits to society could be far greater. We suggest that rather than paying mussel farmers for their work that nutrient trading systems are introduced to improve coastal waters. In this context an alternative to nitrogen reduction in the sewage treatment plant in Lysekil community through mussel farming is presented. Accumulation of bio-toxins has been identified as the largest impediment to further expansion of commercial mussel farming in Sweden, but the problem seems to be manageable through new techniques and management strategies. On the basis of existing and potential regulations and payments, possible win-win solutions are suggested.

  • 108.
    Lind-Halldén, Christina
    et al.
    Kristianstad University, Department of Mathematics and Science.
    Halldén, Christer
    Department of Clinical Chemistry, Malmö University Hospital.
    Säll, T.
    Department of Genetics, Lund University.
    Genetic variation in Arabidopsis suecica and its parental species A. arenosa and A. thaliana2002In: Hereditas, ISSN 0018-0661, E-ISSN 1601-5223, Vol. 136, no 1, p. 45-50Article in journal (Refereed)
    Abstract [en]

    Random amplified polymorphic DNA (RAPD) markers were used to estimate the level of genetic variation in Swedish accessions of the allopolyploid Arabidopsis suecica and its parental species A. thaliana and A. arenosa. The results showed clear differences among the three species with respect to the level of variation. A. arenosa was highly variable, A. thaliana showed a moderate level of variation whereas A. suecica was much less variable than the two other species. An extended analysis covering 19 Swedish populations of A. suecica corroborated the low level of variation in this species, yet 16 unique phenotypes were observed. No isolation by distance was observed. When the genetic variation was partitioned among and within populations of A. suecica, the results showed that the majority of the variation (81%) occurred among populations. This result is interpreted as a strong indication that A. suecica is autogamous in nature.

  • 109.
    Lindner, Ann-Charlotte
    Kristianstad University College, Department of Mathematics and Science.
    Avdunstning och molekyler: en longitudinell studie av hur grundskoleelever utvecklar sina uppfattningar om avdunstningsfenomen2007Licentiate thesis, monograph (Other academic)
    Abstract [en]

    This thesis presents results from a longitudinal study of students in compulsory school. The project started in spring 1997 when the students were about six years old, and finished in spring 2006 when they left compulsory school. One aim of the study was to follow individual students' development of conceptions about evaporation during their year in scool. Another aim has been to study how the students used a simplified particle model in their explanations of evaporation. The particle model was introduced early, in their first year. Teaching episodes focused on water, and its changes of state connected to everyday phenomena was taught. The students were interviewed before and after the teaching interventions and the explanations were analysed in order to find a comprehensive description of each student. In my analysis I have among other things found that heat is an important factor for evaporation when students are young but its importance seems to decrease when they get older. I have also seen that particle model has been helpful for the students in their explanations of evaporation.

  • 110.
    Lindner, Ann-Charlotte
    et al.
    Kristianstad University, Department of Mathematics and Science. Kristianstad University, Research environment Learning in Science and Mathematics (LISMA).
    Redfors, Andreas
    Kristianstad University, Department of Mathematics and Science. Kristianstad University, Research environment Learning in Science and Mathematics (LISMA).
    Kan grundskoleelevers uppfattningar om fysikaliska fenomen utvecklas genom riktade undervisningsinsatser?2006In: Naturfagsdidaktikkens mange facetter: proceedings fra Det 8. Nordiske Forskersymposium om undervisningen i naturfag / [ed] Bering, Lisbeth m.fl., Köpenhamn: Danmarks Pædagogiske Universitets Forlag , 2006, p. 217-225Conference paper (Refereed)
    Abstract [sv]

    Den här studien är en del i ett större forskningsprojekt som startade våren 1997 då eleverna var 6-7 år. Jag har genomfört riktade undervisningsinslag som byggt på vardagsfenomen kring vatten och dess fasändringar. Eleverna har intervjuats före och efter vår undervisning. Elevernas förklaringar har analyserats tillsammans med filmade undervisningstillfällen mot bakgrund av den teoretiska ramen för att söka få en helhetsbild av varje elev och följa hur de utvecklar sina uppfattningar. Det jag ser är att eleverna får en bättre förståelse av begreppen avdunstning och kondensation.

  • 111.
    Lindner, Ann-Charlotte
    et al.
    Kristianstad University, Department of Mathematics and Science.
    Redfors, Andreas
    Kristianstad University, Department of Mathematics and Science.
    Longitudinell studie av hur grundskoleelevers uppfattningar om fysikaliska fenomen utvecklas2006In: Från naturvetenskap och specialpedagogik till hållbar utveckling inom lärarutbildning / [ed] Häggblom, Lisen, Palmberg, Irmeli, Ström, Kristina, Vasa: Åbo Akademi, Pedagogiska fakulteten , 2006, no 19, p. 93-107Chapter in book (Other (popular science, discussion, etc.))
    Abstract [sv]

    Den här studien är en del i ett större forskningsprojekt som startade våren 1997 då eleverna var 6-7 år. Jag har genomfört riktade undervisningsinslag som byggt på vardagsfenomen kring vatten och dess fasändringar. Eleverna har intervjuats före och efter vår undervisning. Elevernas förklaringar har analyserats tillsammans med filmade undervisningstillfällen mot bakgrund av den teoretiska ramen för att söka få en helhetsbild av varje elev och följa hur de utvecklar sina uppfattningar. Det jag ser är att eleverna får en bättre förståelse av begreppen avdunstning och kondensation.

  • 112.
    Lindner, Ann-Charlotte
    et al.
    Kristianstad University, Department of Mathematics and Science.
    Redfors, Andreas
    Kristianstad University, Department of Mathematics and Science.
    Partikelmodell som utgångspunkt för elevers förklaringar av avdunstning2007In: NorDiNa: Nordic Studies in Science Education, ISSN 1504-4556, E-ISSN 1894-1257, Vol. 3, no 1, p. 29-44Article in journal (Refereed)
    Abstract [en]

    This paper presents results from a longitudinell study of students in compulsary school in Sweden. The project started in 1997 when the students were about six years old, and finished in 2006 when they left compulsary school. The aim of the study is to follow individual students’ development of conceptions about evaporation during their years in school. Teaching episodes focused on water, and it´s changes of state connected to everyday phenomena have been taught. Early in the study a simplified particle model was introduced in order to see if this would help the students in their explanations. The students were interviewed before and after the teaching interventions and the explanations were analysed in order to find a comprehensive description of each student. Here we describe the use of the early introduced particle concept and how it effects the students’ explanations of evaporation and their uses of explanatory models.

  • 113.
    Lundin, M.
    et al.
    Department of Physics, University of Lund.
    Adler, J. O.
    Department of Physics, University of Lund.
    Boland, M.
    Department of Physics, University of Lund.
    Fissum, K.
    Department of Physics, University of Lund.
    Glebe, T.
    Zweites Physikalisches Institut, Universität Göttingen.
    Hansen, K.
    Department of Physics, University of Lund.
    Isaksson, L.
    Department of Physics, University of Lund.
    Kaltschmidt, O.
    Zweites Physikalisches Institut, Universität Göttingen.
    Karlsson, M.
    Department of Physics, University of Lund.
    Kossert, K.
    Zweites Physikalisches Institut, Universität Göttingen.
    Levchuk, M. I.
    B. I. Stepanov Institute of Physics, Belarussian Academy of Sciences, Minsk.
    Lilja, P.
    Department of Physics, University of Lund.
    Lindner, Bengt
    Kristianstad University College, Department of Mathematics and Science.
    L'Vov, A. I.
    P. N. Lebedev Physical Institute, Moscow.
    Nilsson, B.
    Department of Physics, University of Lund.
    Oner, D. E.
    Zweites Physikalisches Institut, Universität Göttingen.
    Poech, C.
    Zweites Physikalisches Institut, Universität Göttingen.
    Proff, S.
    Zweites Physikalisches Institut, Universität Göttingen.
    Sandell, A.
    Department of Physics, University of Lund.
    Schröder, B.
    Department of Physics, University of Lund.
    Schumacher, M.
    Zweites Physikalisches Institut, Universität Göttingen.
    Sims, D. A.
    Department of Physics, University of Lund.
    Compton scattering from the deuteron and extracted neutron polarizabilities2003In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 90, no 19Article in journal (Refereed)
    Abstract [en]

    Differential cross sections for Compton scattering from the deuteron were measured at MAX-Lab for incident photon energies of 55 and 66 MeV at nominal laboratory angles of 45degrees, 125degrees, and 135degrees. Tagged photons were scattered from liquid deuterium and detected in three NaI spectrometers. By comparing the data with theoretical calculations in the framework of a one-boson-exchange potential model, the sum and the difference of the isospin-averaged nucleon polarizabilities, alpha(N) + beta(N) = 17.4 +/- 3.7 and alpha(N) - beta(N) = 6.4 +/- 2.4 (in units of 10(-4) fm(3)), have been determined. By combining the latter with the global-averaged value for alpha(p) - beta(p) and using the predictions of the Baldin sum rule for the sum of the nucleon polarizabilities, we have obtained values for the neutron electric and magnetic polarizabilities of alpha(n) = 8.8 +/- 2.4(total) +/- 3.0(model) and beta(n) = 6.5 -/+ 2.4(total) -/+ 3.0(model), respectively.

  • 114.
    Löfgren, Lena
    Kristianstad University, Department of Mathematics and Science.
    Barns uppfattningar av materia - hur kan vatten förflytta sig?2002Conference paper (Refereed)
    Abstract [sv]

    Vad händer i ett glas med vatten när man lägger en glasskiva ovanpå glaset? Vad är det som sitter på insidan av glasskivan och hur har det kunnat bli så? I en longitudinell studie där vi intervjuat barn varje år, från 7 till 11 års ålder, har vi följt hur deras föreställningar och förklaringar av ovanstående fenomen förändras. De flesta vet eller förmodar redan som 7-åringar att det är vatten, i form av små droppar, på glasskivan. De flesta förklaringarna innehåller en vattenrörelse från vattnet i glaset till vattendroppar på glasskivan. Vilka uppfattningar av denna vattenrörelse ger barnen uttryck för? För många barn är värme en betydelsefull faktor för att vattnet ska kunna flytta sig. I flera fall är det det slutna systemet som möjliggör att värme bildas. Andra barn har uppfattningar som bygger på att vattnet övergår i små droppar, små bubblor eller molekyler och att det är litenheten hos dessa partiklar som möjliggör förflyttningen. Barnens egna erfarenheter spelar stor roll för deras förklaringar. De uppfattningar som barnen i denna studie ger uttryck för jämförs med uppfattningar man funnit i andra undersökningar av liknande fenomen.

  • 115.
    Magntorn, Ola
    et al.
    Kristianstad University, Department of Mathematics and Science.
    Helldén, Gustav
    Kristianstad University, Department of Mathematics and Science.
    Reading nature: experienced teachers’ reflections on a teaching sequence in ecology : implications for future teacher training2006In: NorDiNa: Nordic Studies in Science Education, ISSN 1504-4556, E-ISSN 1894-1257, no 5, p. 67-82Article in journal (Refereed)
    Abstract [en]

    This article explores experienced primary teachers views on teaching for ‘reading nature’. The concept ‘reading nature’ has to do with an ability to recognise organisms and relate them to material cycling and energy flow in the specific habitat which is to be read. It has to do with the natural world that we face outside and the tools we have are our experiences from previous learning situations both in and out-of-doors. The teachers were asked to comment on the content of a CD-ROM with teaching sequences from a primary class studying a river ecosystem. Perceptions that teachers held were found to be supportive but complex and varied regarding the possibilities and advantages of implementing this type of teaching design in the everyday classroom. The paper finishes by identifying some implications for teacher training to support fieldwork and ecological literacy in primary schools in the future.

  • 116.
    Mårtensson, Lennart
    et al.
    Kristianstad University College, Department of Mathematics and Science.
    Bergström, Staffan
    Kristianstad University College, Department of Mathematics and Science.
    Svensson, Britt-Marie
    Kristianstad University College, Department of Mathematics and Science.
    Mathiasson, Lennart
    Department of Analytical Chemistry, Lund University.
    Development and application of an analytical protocol for evaluation of treatment processes for landfill leachates: II. Evaluation of leachate treatment efficiency of different steps in a constructed pilot plant2007In: International Journal of Environmental Analytical Chemistry, ISSN 0306-7319, E-ISSN 1029-0397, Vol. 87, no 1, p. 17-27Article in journal (Refereed)
    Abstract [en]

    Different methods for treatment of leachate from a municipal solid waste (MSW) landfill were tested in a pilot plant. Raw leachate was pre-treated with aeration and sedimentation, followed by several parallel individual steps such as bioremediation, chemical oxidation, ozonation, and geo-bed filters. The efficiency of different treatment steps was evaluated according to one previously developed protocol, which includes measurements of several parameters such as conductivity, pH, nutrients, chloride, metals, organic compounds, and acute toxicity before and after a treatment step. The treatment steps which showed the highest efficiency towards organic pollutants in leachate were ozone treatment and chemical oxidation. The use of an adsorption filter, a geo-bed with a mixture of peat and bottom ash with ca 10% remaining carbon, also had good effects. A combination of pre-treatment and a geo-bed filter with peat and carbon ash gave the best overall treatment results when water-quality parameters such as total organic carbon and ammonia-nitrogen were also considered.

  • 117.
    Nammari, Diauddin R.
    et al.
    Environmental Engineering, Department of Technology, University of Kalmar.
    Marques, Marcia
    Environmental Engineering, Department of Technology, University of Kalmar.
    Thörneby, Lars
    Environmental Engineering, Department of Technology, University of Kalmar.
    Hogland, William
    Environmental Engineering, Department of Technology, University of Kalmar.
    Mathiasson, Lennart
    Kristianstad University College, Department of Mathematics and Science.
    Mårtensson, Lennart
    Kristianstad University College, Department of Mathematics and Science.
    Emissions from baled municipal solid waste: I. Methodological approach for investigation of gaseous emissions2007In: Waste Management & Research, ISSN 0734-242X, E-ISSN 1096-3669, Vol. 25, no 1, p. 39-48Article in journal (Refereed)
    Abstract [en]

    This paper presents a methodological approach for the study of volatile organic compounds (VOCs) in air, emitted during storage of municipal solid waste in bales. Determination of VOCs was based on sampling with adsorbent tubes followed by automated analysis using on-line work-up with a thermal desorption unit directly connected to a gas chromatograph-mass spectrometer. Using calculation algorithms and multidimensional statistical analysis of large amounts of data collected, the information was compressed and Visualized. The approach was applied to initial measurements of emissions of VOCs from 24 bales composed of municipal solid waste, each bale stored in a wooden box. These bales were produced using the two types of baling equipment available, resulting in cylindrical or rectangular bales, with different densities. Hundreds of different VOCs emitted from these bales sorted out into groups with different chemical structure. Differences in VOC concentrations in air were found between wastes stored in cylindrical or rectangular bales. For instance, it was found that the concentration of VOCs (relative to the concentration of toluene), in the first experiment after storing, for cylindrical bales with six layers of LDPE was 115 +/- 10 mu g m(-3), while for rectangular bales it was only 64 +/- 8 mu g m(-3). The procedure used for data interpretation suggested different degradation mechanisms in different types of bales. The use of multiple data interfaces, multidimensional statistics and automated chemical analysis methods are likely to be more and more common for waste companies and waste research in the near future. This is due to the interdisciplinary nature of the subject that relies heavily on various areas of science and information technology.

  • 118.
    Nilsson, Ola
    et al.
    Kristianstad University College, Department of Mathematics and Science.
    Norberg, Mats
    Kristianstad University College, Department of Mathematics and Science.
    Plan för multifunktionella buffertzoner längs Vramsån på Malörten AB: s jordbruksfastigheter2007Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    To create multifunctional buffer strips along a watercourse in an economically sustainable way requires consideration of many different factors. In this plan we have selected pollutant reduction as the main purpose of the buffer strip. We have also strived to achieve minimal income loss due to reduced production, increased biological diversity, good game preservation that leads to higher income from hunting, aesthetical satisfaction and possibility to profit from available subsidies. This is done mainly to make landowners/farmers more interested in creating buffer strips along water courses.

    As sand is the dominant type of soil in the area, the water course is less affected by surface runoff compared to if the soil would be clay or some other finer texture. Game preservation and subsidies have therefore been the main factors when establishing the width of the strip, because these require wider buffer strips in some cases. Most of the buffer strips have been left as fallow fields and multilayered vegetation systems have been strived for. This means combined tree, bush and grass/herb zones. To

    be allowed to plant bushes on a fallow field and also receive subsidies we suggest that perennial energy plants should be planted in some parts of the buffer strips. Perennial energy plants have several benefits, such as income when harvested and game preservation. In addition we have suggested planting and self rejuvenation of the local trees and bushes.

  • 119.
    Nummi, Petri
    et al.
    Helsinki University.
    Elmberg, Johan
    Kristianstad University, Department of Mathematics and Science.
    Pöysä, Hannu
    Gunnarsson, Gunnar
    Kristianstad University, Department of Mathematics and Science.
    Sjöberg, Kjell
    Sveriges Lantbruksuniversitet, Umeå.
    Varhaiset tavipoikueet asuttavat suotuisimmat laikut ja menestyvät parhaiten2005In: Suomen Riista, ISSN 0355-0656, Vol. 51, p. 1685-1692Article in journal (Refereed)
  • 120.
    Ohlsson, Annelié
    et al.
    Kristianstad University College, Department of Mathematics and Science.
    Svensson, Jerker
    Kristianstad University College, Department of Mathematics and Science.
    Skogen - vårt biologiska kulturarv2007Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    This article deals with the woodlands as a biological cultural heritage and how it is taken care of in the protected woodlands in Skåne, in the south of Sweden, especially the deciduous trees which is dominated by beech. High biological values have emerged as a result of grazing and different kinds of forestry. The protected woodlands have been ripped of its cultural influences which changes the biological values on which the original reasons for protection was founded.

  • 121.
    Olteanu, Constanta
    Kristianstad University, Department of Mathematics and Science.
    Andragradsekvation som lärandeobjekt: det innehåll som eleverna får ta del av och dess betydelse för elevernas lärande2005In: Forskningsarbete pågår: Nationella forskarskolan i pedagogiskt arbete (NaPA) / [ed] Erixon, Per-Olof, Umeå: Umeå universitet , 2005, p. 21-33Chapter in book (Other academic)
    Abstract [sv]

    I denna artikel presenteras hur lärare behandlar undervisningsinnehållet då de undervisar om andragradsekvationen. Dessutom presenteras kommunikationens roll i undervisningen och på vilket sätt kommunikationseffektiviteten öppnar olika möjligheter att tolka och refl ektera över lösningen av en andragradsekvation för eleverna. Resultaten visar att lärarens sätt att erbjuda olika dimensioner av lärandeobjektet refl ekteras i hur elevernas lärande utvecklats. 

  • 122.
    Olteanu, Constanta
    Kristianstad University College, Department of Mathematics and Science.
    "Vad skulle x kunna vara?": andragradsekvation och andragradsfunktion som objekt för lärande2007Doctoral thesis, monograph (Other academic)
    Abstract [en]

    Algebraic equations and functions play an important role in various mathematical topics, including algebra, trigonometry, linear programming and calculus. Accordingly, various documents, such as the most recent Swedish curriculum (Lpf 94) for upper secondary school and the course syllabi in mathematics, specify what the students should learn in Mathematics Course B. They should be able to solve quadratic equations and apply this knowledge in solving problems, explain the properties of a function, as well as be able to set up, interpret and use some nonlinear functions as models for real processes. To implement these recommendations, it is crucial to understand the students’ way of experiencing quadratic equations and functions, and describe the meaning these have for the students in relation to the possibility they have to their experience of them. The aim of this thesis is to analyse, understand and explain the relation between the handled and learned content, which consists of second-degree equations and quadratic functions, in classroom practice. This means that content is the research object and not the teacher’s conceptions or knowledge of, or about this content. This restriction implies that the handled and learned contents are central in this study and will be analysed from different perspectives. The study includes two teachers and 45 students in two different classes. The data consist of video-recordings of lessons, individual sessions, interviews and the teachers’/researcher’s review of the individual sessions. The students’ tests also constituted an important part of the data collection. When analysing the data, concepts relating to variation theory have been used as analytical tools. Data have been analysed in respect of the teachers’ focus on the lesson content, which aspects are ignored and which patterns of dimensions of variations are constituted when the contents are handled by the teachers in the classroom. Also, data have been analysed in respect of the students’ focus when they solve different exercises in a test situation. It can be shown that the meaning of parameters, the unknown quantity in an equation and the function’s argument change several times when the teacher presents the content in the classroom and when the students solve different exercises. It can also be shown that the teachers and the students develop complicated patterns of variation during the lessons and that the ways in which the teachers open up dimensions of variation play an important role in the learning process. The results indicate that there is a convergent variation leading the students to improve their learning. By focusing on some aspects of the objects of learning and create convergent variations, it is possible for the students to understand the difference between various interpretations of these aspects and thereafter focus on the interpretation that fits in a certain context. Furthermore, this variation leads the students to make generalisations in each object of learning (equations and functions) and between these objects of learning. These generalisations remain over time, despite working with new objects of learning. An important result in this study is that the implicit or explicit arguments of a function can make it possible to discern an equation from a function despite the fact that they are constituted by the same algebraic expression.

  • 123.
    Ottvall, Richard
    et al.
    Department of Ecology, Lund University.
    Gunnarsson, Gunnar
    Kristianstad University, Department of Mathematics and Science.
    Morphological and molecular sex identification of Redshanks Tringa totanus:  2007In: Bird Study, ISSN 0006-3657, E-ISSN 1944-6705, Vol. 54, no 1, p. 127-129Article in journal (Refereed)
  • 124.
    Paulsson, Agne
    Kristianstad University College, Department of Mathematics and Science.
    Synstrålar eller titta på?2007In: Tsunami, ISSN 1651-5803, no 2Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    Mycket Na-didaktisk forskning har gjorts för att undersöka elevers vardagsföreställningar om olika naturvetenskapliga fenomen. Synstrålar eller idén att något kommer ut från ögat (blick,impuls, stråle) när vi ser ett föremål anses vara en sådan föreställning. Elever som på en skriftlig fråga ritar en pil mellan ögonen och ett föremål, eller säger att en person” tittar på ” ett föremål anses ha denna vardagsföreställning. I detta arbete ifrågasätter jag detta påstående och undrar om inte synstrålar kan vara ”a misconception of a misconception”. Dels har jag undersökt hur vanligt synstrålar är jämfört med andra vardagsföreställningar hos lärarstudenter. Dels har jag med andra glasögon tittat på de intervjuutdrag som publicerats i ett pionjärarbete inom denna forskning. Jag fann synstrålar klart mindre vanlig vardagsföreställning. Vidare ser jag inga ”synstrålar ” i de intervjuutdrag som jag analyser. Mycket Na-didaktisk forskning har gjorts för att undersöka elevers vardagsföreställningar om olika naturvetenskapliga fenomen. Synstrålar eller idén att något kommer ut från ögat (blick,impuls, stråle) när vi ser ett föremål anses vara en sådan föreställning. Elever som på en skriftlig fråga ritar en pil mellan ögonen och ett föremål, eller säger att en person” tittar på ” ett föremål anses ha denna vardagsföreställning. I detta arbete ifrågasätter jag detta påstående och undrar om inte synstrålar kan vara ”a misconception of a misconception”. Dels har jag undersökt hur vanligt synstrålar är jämfört med andra vardagsföreställningar hos lärarstudenter. Dels har jag med andra glasögon tittat på de intervjuutdrag som publicerats i ett pionjärarbete inom denna forskning. Jag fann synstrålar klart mindre vanlig vardagsföreställning. Vidare ser jag inga ”synstrålar ” i de intervjuutdrag som jag analyser.

  • 125.
    Persson, Christel
    Kristianstad University, Department of Mathematics and Science.
    Datorn som redskap i matematikundervisningen: perspektivet 0 till 13 år2004Other (Other academic)
    Abstract [sv]

    Huvudsyftet med undersökningen är att utröna i vad mån lärarstudenter har ett positivt eller negativt förhållningssätt till datorer i pedagogisk verksamhet och vilka argument som avgör deras ställningstagande. I arbetet redogörs för olika grundläggande vetenskapliga inlärningsteorier som ligger till grund för våra senaste läroplaner och styrdokument. De utgör utgångspunkter för uppsatsens centrala tema som bl.a. problematiserar kring en utökad användning av datorer i undervisningen och de konsekvenser det kan medföra. Urvalet är sådant att den utgör en tvärsnittsundersökning ur ett skolperspektiv samtidigt som den berör lärarutbildningen. Möjligheterna och riskerna analyseras i relation till olika inlärningsteorier och lärarnas förutsättningar att använda datorn som ett av många hjälpmedel för en varierad undervisning i skolan. Undersökningen är både kvalitativ och kvantitativ men i huvudsak inriktad på barns och elevers samlärande i förhållande till individuellt lärande inom ämnet matematik.

  • 126.
    Persson, Christel
    Kristianstad University, Department of Mathematics and Science.
    Environmental Learning for Sustainable Evolution in School and Teaching. Paper presented at International Organization for Science and Technology Education XI th Symposium Lublin 25-30 July2004Conference paper (Refereed)
  • 127.
    Persson, Christel
    Kristianstad University, Department of Mathematics and Science.
    Learning environmental conceptions in primary school with a scientific approach. Paper presented at The 5th ESERA Conference: Contributions of Research to Enhancing Students’ Interest in Learning Science, 28 augusti – 1 september 2005 i Barcelona, Spanien2005Conference paper (Refereed)
  • 128.
    Persson, Christel
    Kristianstad University, Department of Mathematics and Science.
    Learning environmental concepts in primary school: a longitudinal study2007In: Record of proceedings - FontD: scientific meeting held in Vadstena, April 19-21, 2006 / [ed] Tibell, Lena & Strömdahl, Helge, Norrköping: The Swedish National Graduate School in Science and Technology Education, Department of Social and Welfare Studies, Linköping University , 2007Conference paper (Other academic)
  • 129.
    Persson, Christel
    Kristianstad University, Department of Mathematics and Science.
    Lärande i miljö i grundskolans lägre stadier: en studie av elevers användning av begrepp och samband med naturvetenskaplig utgångspunkt2005In: Naturfagsdidaktikkens mange facetterv: proceedings fra Det 8. Nordiske Forskersymposium om undervisningen i naturfag / [ed] Lisbeth Bering m.fl., Aarhus: Aarhus universitetsforlag , 2005Conference paper (Refereed)
  • 130.
    Persson, Christel
    Kristianstad University, Department of Mathematics and Science.
    Models for learning and teaching in environmental sustainability in school: a short presentation of a new project in environmental research2004In: Learning to change our world?: Swedish research on education & sustainable development / [ed] Per Wickenberg, Lund: Studentlitteratur , 2004, p. 337-338Chapter in book (Other (popular science, discussion, etc.))
  • 131.
    Persson, Christel
    Kristianstad University, Department of Mathematics and Science.
    Naturens teknik och människans teknikutveckling: en idéhistorisk utblick2005In: Tsunami, ISSN 1651-5803, no 1Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    Ekologisk design är ett nytt vetenskapsområde, som omfattar olika sätt att finna miljöanpassade och optimerade tekniska lösningar. Förebild är den anpassning som ägt rum i naturen, där levande organismer anpassats och optimerats för att överleva under evolutionens gång. Sett i ett idéhistoriskt perspektiv finner vi emellertid att människor länge funderat på olika samband i naturen och våra egna konstruktioner. Grekiska matematiker som levde under 400- respektive 300-talet före vår tideräkning beskrev gyllene snittet och den gyllene kvoten 1,68034…, vilka är proportioner som betecknats som en ideala. Så vitt skilda föremål som långskeppet i Uppsala domkyrka och svenska flaggan är konstruerade enligt gyllene snittets proportioner. Men hur hänger det egentligen ihop? En granskning visar nämligen att redan pyramiderna som uppfördes 2 800 f Kr. följer gyllene snittets proportioner. Ännu mer anmärkningsvärt är att det i naturen också finns symmetrier som kan beskrivas med hjälp av den gyllene kvoten. Exempel är antalet fjäll hos en tallkotte och ananasens fruktblad. Bland sociala insekterna som bin och termiter återfinns exempel på optimeringar, som bidragit till deras överlevnad i oförändrade former under årmiljoner. I denna artikel ges slutligen exempel på utveckling av redskap i naturen som påminner om människans redskap, vilket markerar vår tillhörighet.

  • 132.
    Persson, Christel
    Kristianstad University, Department of Mathematics and Science.
    Nya former för lärande: leken som ett redskap i lärandet i miljö i grundskolans tidigare årskurser2006In: NorDiNa, ISSN 1504-4556, Vol. 2, no 1, p. 60-73Article in journal (Refereed)
  • 133.
    Persson, Christel
    et al.
    Kristianstad University, Department of Mathematics and Science.
    Musidlowska-Persson, Anna
    Lund University.
    Learning environmental concepts in primary school for sustainable development2007In: Journal of Earth System Science Education, ISSN 1529-7993Article in journal (Refereed)
    Abstract [en]

    This paper explores environmental education research in primary school. The longitudinal study started in 2003, with 29 children nine years of age, in a city in southern Sweden. The teacher works with projects in science and technology to stimulate the pupils’ interest and participation in environmental education. Semi-structured interviews with the young pupils have been carried out. In order to analyse the classroom communication between the teacher and the children and also among the children, videotaped sequences from the lessons are collected, in which the Socratic dialogue is practiced. Stimulated recall as a method is also used to find out the teacher’s reactions during the lessons. In order to catch environmental details as well as a holistic perspective, the Earth’s system model is used in the analysis, e.g. the lithosphere, the atmosphere and the hydrosphere as well as the biosphere and the technosphere.

    It was observed that the children are able to argue about possibilities to change different daily routines in different ways, which reduce disturbances to the environment. Some pupils can see the connection between the increasing greenhouse effect and pollution from the cars. Others can see relations between increasing temperature and melting polar caps. In stimulated recall the teacher points out possible connections in the Earth system and in environmental learning.

    This material is one part of an ongoing longitudinal doctoral study and the videotaped sequences have been caught from year 2003 to 2006. The interviews with the children have been taped every spring from year 2003 to 2006.

  • 134.
    Persson, Christel
    et al.
    Kristianstad University, Department of Mathematics and Science.
    Persson, Torsten
    Hållbar utveckling: människa, miljö och samhälle2007Book (Other academic)
  • 135.
    Persson, Christel
    et al.
    Kristianstad University, Department of Mathematics and Science.
    Persson, Torsten
    Miljökunskap för gymnasieskolan2001 (ed. 1)Book (Other (popular science, discussion, etc.))
  • 136.
    Persson, Jonas R.
    Kristianstad University, Department of Mathematics and Science.
    Determination of core polarization in Eu+ using the hyperfine anomaly2007In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. 76, no 5, p. 449-451Article in journal (Refereed)
    Abstract [en]

    The interaction between open shells and the electron core or the core polarization of the 4f(7)(S-8)5d D-9(2),3,4,5(degrees) states in Eu+, has been determined by using the hyperfine anomaly. The results are compared with the experimental values and calculated hyperfine interaction integrals.

  • 137.
    Persson, Martin
    et al.
    Kristianstad University College, Department of Mathematics and Science.
    Ragnarsson, Lisa
    Kristianstad University College, Department of Mathematics and Science.
    Allmogeåker i teori och praktik - anläggning av en allmogeåker i nordvästra Kristianstad samt utvärdering av kornet Ymer, Gotlandsråg och hotade åkerogräs2005Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Människan har brukat jorden sen många tusen år tillbaka. Förmågan att förändra

    odlingslandskapet och påverka dess utseende och innehåll har dock varit störst efter andra

    världskriget. Många av jordbrukslandskapets arter är synantroper dvs. att de direkt eller

    indirekt är beroende av människan för sin existens. Dessa arter har varit människans

    följeslagare i tusentals år. Åkerogräsen har kunnat öka och finna goda tillväxtchanser i

    dåtidens odlingslandskap men efter andra världskriget ökade mekaniseringen och

    användandet av herbicider och konstgödning i det traditionella jordbruket, vilket snabbt

    förändrade förutsättningarna för åkerogräsen. Åkerogräsen är idag i stor utsträckning hotade

    på grund av dagens rationella jordbruk. Olika arter är hotade på grund av olika faktorer vilket

    kunnat härledas i forskning kring de hotade åkerogräsen.

    Medvetenheten om det ökade hotet mot den biologiska mångfalden har ökat och intresset för

    vårt biologiska arv bland allmänheten blir allt större. Dessutom har politiska beslut påverkat i

    rätt riktning och slagit vakt om den biologiska mångfalden. Idag har olika bevarandeformer

    för åkerogräsen skapats bl.a. Projekt Allmogeåker. Det är ett projekt som syftar till att bevara

    och förbättra ogräsarternas förutsättningar. Andra alternativ för bevarande är blomsteråkrar,

    rätt skötsel av värdefulla vägkanter och viltåkrar. I det moderna jordbruket kan åkerogräsen

    bevaras med hjälp av jordbrukspolitiken i form av miljöstöd och specialstöd. Problematiken

    kring åkerogräsens situation är idag aktualiserat i och med att ett nytt Åtgärdsprogram för

    bevarande av Rödlistade Åkerogräs håller på att utarbetas.

    Vårt syfte med rapporten är att praktiskt tillämpa de rekommendationer2 som Roger Svensson,

    Marita Wigren-Svensson och Torleif Ingelög har satt upp i boken ”Hotade åkerogräs, biologi

    och bevarande i Allmogeåkrar” och sedan utvärdera denna allmogeåker med två olika

    spannmålsgrödor och olika rödlistade åkerogräs. Utifrån detta har vi arbetat med följande

    frågeställningar:

    • Hur ser situationen ut för de hotade åkerogräsen?

    • Vad är anledningarna till dessa förhållanden?

    • Vad är orsaken till skillnaderna i grobarhet hos de olika åkerogräsen?

    • Vad beror skillnaderna i grobarhet på vad gäller korn kontra råg

    • Är allmogeåkrar en framtida bevarandeform för de hotade åkerogräsen?

    • Finns det andra alternativ för att bevara åkerogräsen?

    Uppsatsen bygger på dokumentation av vår anlagda allmogeåker i Övarp, i nordvästra Skåne.

    Dokumentationen har pågått från april 2004 till maj 2005. Vi har studerat olika faktorer som

    kan ha påverkat resultaten och diskussionen bygger på våra resultat och erfarenheter utifrån

    dessa. Några faktorer är väder, viltskador, markförhållande, olika egenskaper hos grödorna

    och åkerogräsen. Vår sammanställning har gett resultat som kan tolkas utifrån specifika

    faktorer snarare än allmängiltiga teorier. Resultatens svårighet är dess jämförbarhet.

    Problemet är dels att det saknas liknade studier och dels att varje allmogeåker är unik genom

    sina olika förutsättningar och egenskaper. Därför vore vidare studier på allmogeåkern i Övarp

    en önskvärd uppföljning för att producera ett jämförbart material. Resultaten visar på hur de

    specifika arternas unika egenskaper slår igenom trots en anpassad miljö som gynnar tillväxten

    av åkerogräs. Vår resultatdiskussion kan därmed ses som en vägledning i att anlägga

    allmogeåkrar eller liknande miljöer.

  • 138.
    Pöysä, Hannu
    et al.
    Finnish Game and Fisheries Research Institute, Joensuu Game and Fisheries Research.
    Elmberg, Johan
    Kristianstad University, Department of Mathematics and Science.
    Gunnarsson, Gunnar
    Kristianstad University, Department of Mathematics and Science.
    Nummi, Petri
    Department of Applied Biology, University of Helsinki.
    Sjöberg, Kjell
    Department of Animal Ecology, Swedish University of Agricultural Sciences, Umeå.
    Ecological basis of sustainable harvesting: is the prevailing paradigm of compensatory mortality still valid?2004In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 104, no 3, p. 612-615Article in journal (Refereed)
  • 139.
    Pöysä, Hannu
    et al.
    Finnish Game and Fisheries Research Institute, Evo Game Research Station.
    Sjöberg, Kjell
    Department of Animal Ecology, Swedish University of Agricultural Sciences, Umeå.
    Elmberg, Johan
    Kristianstad University, Department of Mathematics and Science.
    Nummi, Petri
    Department of Applied Zoology, University of Helsinki.
    Pair formation among experimentally introduced mallards Anas platyrhynchos reflects habitat quality2001In: Annales Zoologici Fennici, ISSN 0003-455X, E-ISSN 1797-2450, Vol. 38, no 2, p. 179-184Article in journal (Refereed)
    Abstract [en]

    Using data from two independent field experiments, we address whether pair formation in introduced mallards Anas platyrhynchos is associated with habitat quality, specifically food limitation at the brood stage. Based on the concentration of total phosphorous in the water, the study lakes were divided into two groups, 'poor' and 'rich'. In one of the experiments we used mallard ducklings imprinted on humans to study mass change of ducklings in poor and rich lakes, respectively. It turned out that ducklings foraging on poor lakes gained less mass than ducklings foraging on rich lakes, the division of lakes thus reflecting habitat quality at the brood stage. Introduced mallards formed heterosexual pairs on lakes that were, in a relative sense, high-quality brood habitats, whereas they did not on lakes of low-quality brood habitat. Pair formation thus seemed to reflect the suitability of habitat for breeding.

  • 140.
    Redfors, Andreas
    et al.
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap. Kristianstad University, Research environment Learning in Science and Mathematics (LISMA).
    Holgersson, Ingemar
    Kristianstad University, Department of Mathematics and Science. Kristianstad University, Research environment Learning in Science and Mathematics (LISMA).
    Student teachers’ use of models of matter: a progress report2005Conference paper (Other academic)
    Abstract [en]

    Empirical data on student teachers' use and views of models in physics are investigated. Students’ explanations of phenomena are analysed with the link between model/theory and reality in focus. A secondary focus is how the students’ use of explanatory models is influenced by their views about the nature of scientific knowledge. The project has a combined cross sectional and longitudinal design. Written questionnaires are used, in combination with follow up interviews. Three different phenomena are discussed, a burning candle, a gas flame and a flask with air confined by a balloon. Data is analysed with respect to a theoretical model of learning assuming that students use several different explanatory models, and that they use more than one in explanations of everyday phenomena. Results from this exploratory study are planned to guide further research on how teaching can build upon different perspectives of models to improve student learning.

  • 141.
    Sanchez-Vega, M.
    et al.
    Department of Nuclear and Particle Physics, Uppsala University.
    Mach, Henryk
    Department of Nuclear and Particle Physics, Uppsala University.
    Taylor, R.B.E.
    Department of Nuclear and Particle Physics, Uppsala University.
    Fogelberg, B.
    Department of Nuclear and Particle Physics, Uppsala University.
    Lindroth, A.
    Department of Nuclear and Particle Physics, Uppsala University.
    Aas, A.J.
    Department of Chemistry, University of Oslo.
    Dendooven, P.
    Department of Physics, University of Jyväskylä.
    Honkanen, A.
    Department of Physics, University of Jyväskylä.
    Huhta, M.
    Department of Physics, University of Jyväskylä.
    Lhersonneau, G.
    Department of Physics, University of Jyväskylä.
    Oinonen, M.
    Department of Physics, University of Jyväskylä.
    Parmonen, J.M.
    Department of Physics, University of Jyväskylä.
    Penttilä, H.
    Department of Physics, University of Jyväskylä.
    Äystö, J.
    Department of Physics, University of Jyväskylä.
    Persson, J.R.
    Kristianstad University College, Department of Mathematics and Science.
    Kurpeta, J.
    Faculty of Physics, University of Warsaw.
    Studies of quadrupole collectivity in the γ -soft 106Ru2008In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 35, no 2, p. 159-165Article in journal (Refereed)
    Abstract [en]

    Various alternative models were used to describe the structure of 106Ru . For example, the General Collective Model (GCM) predicts shape-coexistence for 106Ru with a spherical and a triaxial minimum and strongly mixed structures, while in the IBA-2 calculations, where 106Ru was considered as transitional from vibrational U(5) to γ -soft O(6) , no need was found to include the shape-coexisting configurations. In order to provide additional constraints on the model interpretations, we have applied the Advanced Time-Delayed (ATD) βγγ(t) method to measure the level lifetimes of the excited levels in 106Ru . The new results include the half-lives of T 1/2 = 183(3) ps and 7.5(30)ps for the 2+ 1 and 2+ 2 states, respectively.

  • 142.
    Svensson, Britt-Marie
    et al.
    Kristianstad University, Department of Mathematics and Science.
    Mårtensson, Lennart
    Kristianstad University, Department of Mathematics and Science.
    Mathiasson, Lennart
    Lund University, Analytical Chemistry.
    Eskilsson, Linda
    Kristianstad University, School of Engineering.
    Leachability testing of metallic wastes2005In: Waste Management & Research, ISSN 0734-242X, E-ISSN 1096-3669, Vol. 23, no 5, p. 457-467Article in journal (Refereed)
    Abstract [en]

    The performance of two tests, a batch test and a percolation test for the characterization of waste as suggested in the EU council decision 2003/33/EC was investigated. The tests were carried out on two solid waste streams from a metal recycling industry. The concentrations of heavy metals such as Cu, Znand Pb were more than one order of magnitude lower than the proposed limit values. Generally, batch test values were equal or higher than percolation test values. With the proposed test procedures both materials could be considered as non-dangerous wastes. The test performance was also investigated using a leachant with higher ionic strength instead of demineralized water as prescribed. The results clearly show a significant increase in the concentration of some heavy metals. Total concentrations of phenolic compounds and polychlorinated biphenyls were less than 1 p.p.m. and 2 p.p.b., respectively. The precision of the batch and the percolation tests were on average 48 and 35%, respectively.

  • 143.
    Svensson, Britt-Marie
    et al.
    Kristianstad University, Department of Mathematics and Science.
    Mårtensson, Lennart
    Kristianstad University, Department of Mathematics and Science.
    Mathiasson, Lennart
    Department of Analytical Chemistry, Lund University.
    Åkeson, Tobias
    Department of Analytical Chemistry, Lund University.
    Persson, Anders
    South Scania Waste Company, Malmö.
    Leachability testing of sludge from street gullies2006In: Waste Management & Research, ISSN 0734-242X, E-ISSN 1096-3669, Vol. 24, no 3, p. 260-268Article in journal (Refereed)
    Abstract [en]

    Sludge from gullies, on two types of streets with different traffic intensity, was investigated using two recommended EU methods for leachability testing of waste: a two-stage batch test and an up-flow percolation test. The main purpose of this investigation was to gain more knowledge about these leaching test methods to be able to make future decisions on the general applicability of the proposed tests. A number of parameters were determined in the sludge as well as in the eluates obtained from the two leaching tests. These include pH, conductivity, dissolved organic carbon and inorganic ions as chloride ions. A number of metals as Cd, Cr, Cu, Hg, Ni and Zn, were determined by inductive coupled plasma-mass spectrometry and organic compounds were screened by high performance liquid chromatography-diode array UV detection and gas chromatography-mass spectrometry. It was found that the concentrations of metals and organic compounds in the sludge were several orders of magnitudes higher than the actual eluate concentrations. For all metals the concentrations were well below the proposed limit values for non-hazardous waste included in the Council decision document 2003/33/EC. Generally, concentrations obtained in batch test were equal or higher than from percolation tests. The repeatability of the percolation and the batch test were in average 28 and 17%, respectively.

  • 144.
    Säll, T.
    et al.
    Department of Cell and Organism Biology, Genetics, Lund University.
    Jakobsson, M.
    Department of Cell and Organism Biology, Genetics, Lund University.
    Lind-Halldén, Christina
    Kristianstad University, Department of Mathematics and Science.
    Halldén, Christer
    Department of Clinical Chemistry, Malmö University Hospital.
    Chloroplast DNA indicates a single origin of the allotetraploid Arabidopsis suecica2003In: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 16, no 5, p. 1019-1029Article in journal (Refereed)
    Abstract [en]

    DNA sequencing was performed on up to 12 chloroplast DNA regions [giving a total of 4288 base pairs (bp) in length] from the allopolyploid Arabidopsis suecica (48 accessions) and its two parental species, A. thaliana (25 accessions) and A. arenosa (seven accessions). Arabidopsis suecica was identical to A. thaliana at all 93 sites where A. thaliana and A. arenosa differed, thus showing that A. thaliana is the maternal parent of A. suecica. Under the assumption that A. thaliana and A. arenosa separated 5 million years ago, we estimated a substitution rate of 2.9 x 10(-9) per site per year in noncoding single copy sequence. Within A. thaliana we found 12 substitution (single bp) and eight insertion/deletion (indel) polymorphisms, separating the 25 accessions into 15 haplotypes. Eight of the A. thaliana accessions from central Sweden formed one cluster, which was separated from a cluster consisting of central European and extreme southern Swedish accessions. This latter cluster also included the A. suecica accessions, which were all identical except for one 5 bp indel. We interpret this low level of variation as a strong indication that A. suecica effectively has a single origin, which we dated at 20 000 years ago or more.

  • 145.
    Säll, T.
    et al.
    Department of Genetics, Lund University.
    Lind-Halldén, Christina
    Kristianstad University, Department of Mathematics and Science.
    Halldén, Christer
    Department of Clinical Chemistry, Malmö University Hospital,.
    Primer mixtures in RAPD analysis2000In: Hereditas, ISSN 0018-0661, E-ISSN 1601-5223, Vol. 132, no 3, p. 203-208Article in journal (Refereed)
    Abstract [en]

    RAPD (random amplified polymorphic DNA) is a multiplex marker system that conventionally uses single-primer PCR to amplify random DNA fragments. Because of its multiplex nature, it is frequently used in bulked segregant analysis (BSA). In view of the very large numbers of markers BSA often requires, we investigated the use of mixtures of primers as a method of increasing the number of markers available. Theoretically, if a single-primer reaction produces x bands on average, an unrestrained PCR process using a primers should produce xa2 bands. Initially, we investigated mixtures containing from one to five primers. The average number of products increased slightly from the single-primer to the multiple-primer case, whereas it was rather constant for the different multi-primer combinations. This deviation from the theoretical expectations, which we attribute to the effects of competition, shows mixtures of more than two primers to be inefficient. The properties of two-primer mixtures in which the proportions of the two primers were varied were also investigated. The intensities of most of the products were influenced by the proportions of the primers used to create the mixture. A good fit was obtained to a model in which the average competitive ability of a band is directly proportional to the probability of randomly obtaining the band-producing primer combination from the pool of primers. Using two-primer mixtures, a(a-1)/2 different two-primer mixtures can be produced. A comparison of different schemes for constructing the two-primer mixtures indicates that the degree of resampling is similar for all schemes. In conclusion, the use of two-primer mixtures is a simple but very powerful strategy in BSA as it can generate an extremely large number of markers.

  • 146.
    Säll, Torbjörn
    et al.
    Department of Cell and Organism Biology, Genetics, Lund University.
    Lind-Halldén, Christina
    Kristianstad University, Department of Mathematics and Science.
    Jakobsson, Mattias
    Department of Cell and Organism Biology, Genetics, Lund University.
    Halldén, Christer
    Department of Clinical Chemistry, Malmö University Hospital.
    Mode of reproduction in Arabidopsis suecica2004In: Hereditas, ISSN 0018-0661, E-ISSN 1601-5223, Vol. 141, no 3, p. 313-317Article in journal (Refereed)
    Abstract [en]

    The breeding system of Arabidopsis suecica was investigated through genetic analysis of microsatellite segregation patterns in five controlled crosses as well as in 16 single-mother families collected in the wild. Analysis of single and two-locus segregations in the F2 generation following a cross clearly shows that A. suecica is reproduces sexually. The single-mother families show a high level of homozygosity corroborating earlier results indicating a high level of inbreeding. The high level of individual homozygosity is due both to a high level of selfing and to the underlying population structure.

  • 147.
    Ulvholt, Mikael
    Kristianstad University College, Department of Mathematics and Science.
    Bottensedimentets betydelse för flodpärlmusslans föryngring – en metodutveckling 2005Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    The freshwater pearl mussel Margaritifera margaritifera is an endangered species. To survive, the young mussels demand a fairly coarse bottom material containing an appropriate quantity of organic substrate to survive without suffocating. In order to estimate if a bottom is suitable for juvenile mussels, samples of the sediment are needed. To obtain samples a sampling device called the Mulv collector has been developed within this project. Bottom samples were collected from 18 stations in 4 south Swedish streams, Vramsån, Kling-storpsbäcken, Brönnestadsån and Bräkneån. No rejuvenation of the mussel was found at the stations containing more than 25% fine material.

  • 148.
    Wallensten, A.
    et al.
    Smedby Health Center, Kalmar County Council.
    Munster, V. J.
    Department of Virology and National Influenza Center, Erasmus Medical Center, Rotterdam.
    Elmberg, Johan
    Kristianstad University, Department of Mathematics and Science.
    Osterhaus, A. D. M. E.
    Department of Virology and National Influenza Center, Erasmus Medical Center, Rotterdam.
    Fouchier, R. A. M.
    Department of Virology and National Influenza Center, Erasmus Medical Center, Rotterdam.
    Olsen, B.
    Department of Infectious Diseases, Umeå University.
    Multiple gene segment reassortment between Eurasian and American lineages of influenza A virus (H6N2) in Guillemot (Uria aalge)2005In: Archives of Virology, ISSN 0304-8608, E-ISSN 1432-8798, Vol. 150, no 8, p. 1685-1692Article in journal (Refereed)
    Abstract [en]

    Guillemots banded in the northern Baltic Sea were screened for influenza A virus (IAV). Three out of 26 sampled birds tested positive by RT-PCR. Two of these were characterized as subtype H6N2. Phylogenetic analyses showed that five gene segments belonged to the American avian lineage of IAVs, whereas three gene segments belonged to the Eurasian lineage. Our findings indicate that avian IAVs may have a taxonomically wider reservoir spectrum than previously known and we present the first report of a chimeric avian IAV with genes of American and Eurasian origin in Europe.

  • 149.
    Wallensten, Anders
    et al.
    Smedby Health Center, Kalmar.
    Munster, Vincent J.
    Erasmus Medical Center, Rotterdam.
    Latorre-Margalef, Neus
    Kalmar University.
    Brytting, Mia
    Swedish Institute for Infectious Disease Control, Solna.
    Elmberg, Johan
    Kristianstad University, Department of Mathematics and Science.
    Fouchier, Ron A.M.
    Erasmus Medical Center, Rotterdam.
    Fransson, Thord
    Swedish Museum of Natural History, Stockholm.
    Haemig, Paul D.
    Kalmar University.
    Karlsson, Malin
    Swedish Institute for Infectious Disease Control, Solna.
    Lundkvist, Åke
    Swedish Institute for Infectious Disease Control, Solna.
    Osterhaus, Albert D.M.E.
    Erasmus Medical Center, Rotterdam.
    Stervander, Martin
    Ottenby Bird Observatory, Degerhamn.
    Waldenstrom, Jonas
    Kalmar University.
    Olsen, Björn
    Kalmar University.
    Surveillance of influenza A virus in migratory waterfowl in northern Europe2007In: Emerging Infectious Diseases, ISSN 1080-6040, E-ISSN 1080-6059, Vol. 13, no 3, p. 404-411Article in journal (Refereed)
    Abstract [en]

    We conducted large-scale, systematic sampling of influenza type A virus in migratory waterfowl (mostly mallards [Anas platyrhynchos]) at Ottenby Bird Observatory, southeast Sweden. As with previous studies, we found a higher prevalence in fall than spring, and among juveniles compared with adults. However, in contrast to other studies, we found that prevalence in spring was sometimes high (mean 4.0%, highest 9.5%). This finding raises the possibility that ducks are capable of perpetuating influenza A virus of different subtypes and subtype combinations throughout the year and from 1 year to the next. Isolation of the H5 and H7 subtypes was common, which suggests risk for transmission to sensitive domestic animals such as poultry. We argue that wild bird screening can function as a sentinel system, and we give an example of how it could have been used to forecast a remote and deadly outbreak of influenza A in poultry.

  • 150.
    Wiberg, Björn
    et al.
    Kristianstad University College, Department of Mathematics and Science.
    Gustavsson, Patrik
    Kristianstad University College, Department of Mathematics and Science.
    Linux vs: Windows - är Linux KDE möjlig ersättare till Microsoft Windows XP i en likvärdig konkurrenssituation sett ur ett användbarhetsperspektiv?2005Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Syfte

    Syftet med denna uppsats var att genomföra en kvalitativ undersökning kring om KDE kan ersätta Windows XP som användargränssnitt för normalanvändare på en persondator. Vi ville även ta fram de fördelar och nackdelar som KDE har i jämförelse med Windows XP, med eventuella förslag till förbättring.

    Metod

    Primärdata hämtades genom att testa operativsystemet på 25 personer som fick "tänka högt". Detta för att få en anblick om var det kan finnas problem. Även sekundärdata i form av litteratur inom området, tidskrifter, artiklar, rapporter och information från Internet har använts.

    Slutsats

    Resultatet visade klart och tydligt att testpersonerna var nöjda med Linux KDE efter det att de testat det men majoriteten skulle ej kunna tänka sig ersätta Windows XP med Linux KDE. Alltså är inte Linux KDE en möjlig ersättare till Windows XP.

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