SwePub - sökning: WFRF:(Johansson Petter)

Numrering	Referens	Omslagsbild	Hitta
1.	Brodin, Petter, et al. (författare) Natural Killer Cell Tolerance Persists Despite Significant Reduction of Self MHC Class I on Normal Target Cells in Mice 2010 Ingår i: PLOS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 5:10, s. e13174- Tidskriftsartikel (refereegranskat)abstract Background: A major group of murine inhibitory receptors on Natural Killer (NK) cells belong to the Ly49 receptor family and recognize MHC class I molecules. Infected or transformed target cells frequently downmodulate MHC class I molecules and can thus avoid CD8(+) T cell attack, but may at the same time develop NK cell sensitivity, due to failure to express inhibitory ligands for Ly49 receptors. The extent of MHC class I downregulation needed on normal cells to trigger NK cell effector functions is not known. Methodology/Principal Findings: In this study, we show that cells expressing MHC class I to levels well below half of the host level are tolerated in an in vivo assay in mice. Hemizygous expression (expression from only one allele) of MHC class I was sufficient to induce Ly49 receptor downmodulation on NK cells to a similar degree as homozygous expression, despite a strongly reduced cell surface level of MHC class I. Co-expression of weaker MHC class I ligands in the host did not have any further effect on the degree of Ly49 downmodulation. Furthermore, a single MHC class I allele could downmodulate up to three Ly49 receptors on individual NK cells. Only when NK cells simultaneously expressed several Ly49 receptors and hemizygous MHC class I levels, a putative threshold for Ly49 downmodulation was reached. Conclusion: Collectively, our findings suggest that in interactions between NK cells and normal untransformed cells, MHC class I molecules are in most cases expressed in excess compared to what is functionally needed to ensure self tolerance and to induce maximal Ly49 downmodulation. We speculate that the reason for this is to maintain a safety margin for otherwise normal, autologous cells over a range of MHC class I expression levels, in order to ensure robustness in NK cell tolerance.
2.	Aardema, Frederick, et al. (författare) Choice Blindness, Confabulatory Introspection, and Obsessive-Compulsive Symptoms: A New Area of Investigation 2014 Ingår i: International Journal of Cognitive Therapy. - : Springer Science and Business Media LLC. - 1937-1209 .- 1937-1217. ; 7:1, s. 83-102 Tidskriftsartikel (refereegranskat)abstract The current study is the first to investigate confabulatory introspection in relation to clinical psychological symptoms utilizing the Choice Blindness Paradigm (CBP). It was hypothesized that those with obsessive-compulsive symptoms are more likely to confabulate mental states. To test this hypothesis, an experimental choice blindness task was administered in two nonclinical samples (n = 47; n = 76). Results showed that a confabulatory introspection is significantly related to obsessive-compulsive symptoms. There was evidence for its specificity to symptoms of OCD depending on the obsessional theme addressed in the choice blindness task. However, confabulatory introspection was also found to be relevant to other symptoms, including depression and schizotypy. The results highlight a potentially fruitful new area of clinical investigation in the area of insight and self-knowledge, not limited to OCD alone, but potentially other disorders as well.
3.	Ahlinder, Jon, et al. (författare) Increased knowledge of Francisella genus diversity highlights the benefits of optimised DNA-based assays 2012 Ingår i: BMC Microbiology. - : Springer Science and Business Media LLC. - 1471-2180. ; 12, s. 220- Tidskriftsartikel (refereegranskat)abstract Background: Recent advances in sequencing technologies offer promising tools for generating large numbers of genomes, larger typing databases and improved mapping of environmental bacterial diversity. However, DNA-based methods for the detection of Francisella were developed with limited knowledge about genetic diversity. This, together with the high sequence identity between several Francisella species, means there is a high risk of false identification and detection of the highly virulent pathogen Francisella tularensis. Moreover, phylogenetic reconstructions using single or limited numbers of marker sequences often result in incorrect tree topologies and inferred evolutionary distances. The recent growth in publicly accessible whole-genome sequences now allows evaluation of published genetic markers to determine optimal combinations of markers that minimise both time and laboratory costs. Results: In the present study, we evaluated 38 previously published DNA markers and the corresponding PCR primers against 42 genomes representing the currently known diversity of the genus Francisella. The results highlight that PCR assays for Francisella tularensis are often complicated by low specificity, resulting in a high probability of false positives. A method to select a set of one to seven markers for obtaining optimal phylogenetic resolution or diagnostic accuracy is presented. Conclusions: Current multiple-locus sequence-typing systems and detection assays of Francisella, could be improved by redesigning some of the primers and reselecting typing markers. The use of only a few optimally selected sequence-typing markers allows construction of phylogenetic topologies with almost the same accuracy as topologies based on whole-genome sequences.
4.	Almqvist, Sofia, 1980, et al. (författare) Amelogenin is phagocytized and induces changes in integrin configuration, gene expression and proliferation of cultured human dermal fibroblasts 2010 Ingår i: Journal of Materials Science. Materials in Medicine. - : Springer Science and Business Media LLC. - 1573-4838 .- 0957-4530. ; 21:3, s. 947-954 Tidskriftsartikel (refereegranskat)abstract Fibroblasts are central in wound healing by expressing important mediators and producing and remodelling extracellular matrix (ECM) components. This study aimed at elucidating possible mechanisms of action of the ECM protein amelogenin on normal human dermal fibroblasts (NHDF). Amelogenin at 100 and 1000 μg/ml increased binding of NHDF via several integrins, including αvβ3, αvβ5 and α5β1. Further, both surface interaction and cellular uptake of amelogenin by NHDF was observed using scanning and transmission electron microscopy. Gene microarray studies showed >8-fold up or down-regulation of genes, of which most are involved in cellular growth, migration and differentiation. The effect of amelogenin was exemplified by increased proliferation over 7 days. In conclusion, the beneficial effects of amelogenin on wound healing are possibly conducted by stimulating fibroblast signalling, proliferation and migration via integrin interactions. It is hypothesized that amelogenin stimulates wound healing by providing connective tissue cells with a temporary extracellular matrix.
5.	Asenjo, Felipe A., et al. (författare) Semi-relativistic effects in spin-1/2 quantum plasmas 2012 Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 14, s. 073042- Tidskriftsartikel (refereegranskat)abstract Emerging possibilities for creating and studying novel plasma regimes, e. g. relativistic plasmas and dense systems, in a controlled laboratory environment also require new modeling tools for such systems. This motivates theoretical studies of the kinetic theory governing the dynamics of plasmas for which both relativistic and quantum effects occur simultaneously. Here, we investigate relativistic corrections to the Pauli Hamiltonian in the context of a scalar kinetic theory for spin-1/2 quantum plasmas. In particular, we formulate a quantum kinetic theory for the collective motion of electrons that takes into account effects such as spin-orbit coupling and Zitterbewegung. We discuss the implications and possible applications of our findings.
6.	Barone, Angela, et al. (författare) Sialyl-lactotetra, a novel cell surface marker of undifferentiated human pluripotent stem cells. 2014 Ingår i: Journal of Biological Chemistry. - 0021-9258 .- 1083-351X. ; 289:27, s. 18846-18859 Tidskriftsartikel (refereegranskat)
7.	Brolen, Gabriella, et al. (författare) Hepatocyte-like cells derived from human embryonic stem cells specifically via definitive endoderm and a progenitor stage 2010 Ingår i: Journal of Biotechnology. - : Elsevier BV. - 1873-4863 .- 0168-1656. ; 145:3, s. 284-294 Tidskriftsartikel (refereegranskat)abstract Human embryonic stem cells offer a potential unlimited supply for functional hepatocytes, since they can differentiate into hepatocyte-like cells displaying a characteristic hepatic morphology and expressing various hepatic markers. These cells could be used in various applications such as studies of drug metabolism and hepatotoxicity, which however, would require a significant expression of drug metabolizing enzymes. To derive these cells we use a stepwise differentiation protocol where growth- and maturation factors are added. The first phase involves the formation of definitive endoderm. Next, these cells are treated with factors known to promote the induction and proliferation towards hepatic progenitor cell types. In the last phase the cells are terminally differentiated and maturated into functional hepatocyte-like cells. The cultures were characterized by analysis of endodermal or hepatic markers and compared to cultures derived without induction via definitive endoderm. Hepatic functions such as urea secretion, glycogen storage, indocyanine green uptake and secretion, and cytochrome P450-expression and activity were evaluated. The DE-Hep showed a hepatocyte morphology with sub-organized cells and exhibited many liver-functions including transporter activity and capacity to metabolize drugs specific for important cytochrome P450 sub-families. This represents an importantstep in differentiation of hESC into functional hepatocytes. (C) 2009 Elsevier B.V. All rights reserved.
8.	Bull, Peter, et al. (författare) Förstudie obemannade farkoster 2012 Rapport (populärvet., debatt m.m.)abstract Obemannade farkoster används allt oftare, och i allt fler roller, i dagens kon- flikter. Denna rapport ger en bred överblick över området militära obemannade farkoster, samt rekommendationer för inriktningen av framtida FoU-satsningar inom området.Överblicken över området har fokus på både system, förmågor och verksam- heter som är relevanta för Försvarsmakten. Genom att låta de insatsförmågor som definieras i FMUP (Försvarsmaktens utvecklingsplan) gå som en röd tråd genom rapporten, både när specifika system diskuteras och när möjliga scena- rier där obemannade farkoster kan vara till nytta beskrivs, har vi försökt hålla både bredd och relevans i dokumentet.Rekommendationerna vilar på en genomgång av de inriktningsdokument som producerats i Försvarsmakten, t.ex. Perspektivplanneringen och FMUP, besök vid de enheter som dagligen använder obemannade farkoster, UAV-enheten i Karlsborg och Swedec i Eksjö, samt den områdesöverblick som nämns ovan. Slutsatserna är att den effektivaste kompetensuppbyggnaden och kunskapsöver- föringen fås om man skapar breda tvärvetenskapliga projekt inom respektive systemkategori (UAV, UGV, etc) med nära kontakter till materielförsörjnings- processen och perspektivplaneringen. Dessa kan samla kompetensen inom FHS och FOI, övervaka forskningsfronten genom att bevaka tävlingar, konferenser samt delta i internationella samarbeten, samt överföra det samlade resultaten till Försvarsmakten genom demonstrationer av verkliga eller simulerade delsy- stem och interaktiva simuleringar av hela system. Just systemsimuleringar kan göras särskilt realistiska, eftersom interaktionen med de riktiga obemannade systemen till stor del sker igenom kontrollstationernas datorer. På så sätt ska- pas en känsla för både hot och möjligheter med de nya systemen, vilket gagnar både taktikutveckling och materielprocesser.
9.	Bygdéus, Pia, 1963- (författare) Uttryck genom handling : Medierande verktyg i körledararbete med barn och unga 2012 Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract The role of the choir leader is a complex one. When working with a choir, choir leaders often use several aspects of their professional role. The aim of this qualitative study is to describe, verbalise and make visible the mediating tools that choir directors working with children and youth choirs use. In a longitude study, four choir leaders were observed closely while working with their choirs. They also took part in semi-structured interviews. The empirical data material consists of observation notes, reflective writing, individualinterviews, focus conversations and videotapes. Analysed from a sociocultural perspective, the result points to eight groups of mediating tools: a) a listening attitude towards the choir, with the music in focus; b) a variation in ways of working with the choir, where a variety of physical tools are used; c) the use of musical routines; d) the choir director acting as a role model in shaping musicalexpression with the group; e) a concentrated cooperation with the choir through short and expressive instructions; f) reflection in practice by planning and self-evaluation; g) storytelling, which results in memory training, stimulation of the imagination and the sharing of common experience, and h) the use of target images expressed as visions, small/big goals or jointly stated, communicated targets. The choir directors who participated in the study use a variety of approaches and ways of working as a strategy for communicating and working with child and youth choirs.
10.	Chater, Nick, et al. (författare) The non-existence of risk attitude 2011 Ingår i: Frontiers in Psychology. - 1664-1078. ; 2:303 Tidskriftsartikel (refereegranskat)
11.	Forsgård, Jens, et al. (författare) Coamoebas and line arrangements in dimension two 2014 Ingår i: Mathematische Zeitschrift. - : Springer Science and Business Media LLC. - 0025-5874 .- 1432-1823. ; 278:1-2, s. 25-38 Tidskriftsartikel (refereegranskat)abstract We show that the number of components of the complement of the closure of a coamoeba of an algebraic curve f−1(0) on the complex torus (C∗)2 is at most two times the area of the Newton polygon of f. This is an affirmative answer for the two-dimensional case to a conjecture by Mikael Passare.
12.	Hall, Lars, et al. (författare) How the polls can be both spot on and dead wrong: using choice blindness to shift political attitudes and voter intentions. 2013 Ingår i: PLoS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 8:4 Tidskriftsartikel (refereegranskat)abstract Political candidates often believe they must focus their campaign efforts on a small number of swing voters open for ideological change. Based on the wisdom of opinion polls, this might seem like a good idea. But do most voters really hold their political attitudes so firmly that they are unreceptive to persuasion? We tested this premise during the most recent general election in Sweden, in which a left- and a right-wing coalition were locked in a close race. We asked our participants to state their voter intention, and presented them with a political survey of wedge issues between the two coalitions. Using a sleight-of-hand we then altered their replies to place them in the opposite political camp, and invited them to reason about their attitudes on the manipulated issues. Finally, we summarized their survey score, and asked for their voter intention again. The results showed that no more than 22% of the manipulated replies were detected, and that a full 92% of the participants accepted and endorsed our altered political survey score. Furthermore, the final voter intention question indicated that as many as 48% (±9.2%) were willing to consider a left-right coalition shift. This can be contrasted with the established polls tracking the Swedish election, which registered maximally 10% voters open for a swing. Our results indicate that political attitudes and partisan divisions can be far more flexible than what is assumed by the polls, and that people can reason about the factual issues of the campaign with considerable openness to change.
13.	Hall, Lars, et al. (författare) Lifting the Veil of Morality: Choice Blindness and Attitude Reversals on a Self-Transforming Survey 2012 Ingår i: PLoS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 7:9 Tidskriftsartikel (refereegranskat)abstract What exactly are opinions? What does it mean to express an attitude? Given the ubiquitous use of surveys, polls and rating scales, it seems we ought to have firm answers to these fundamental questions, but we do not. Here we present a novel approach to investigate the nature of attitudes. We created a self-transforming paper survey of moral opinions, covering both foundational principles, and current dilemmas hotly debated in the media. This survey ‘magically’ exposed participants to a reversal of their previously stated attitudes, allowing us to record whether they were prepared to endorse and argue for the opposite view of what they had stated only moments ago. The result showed that the majority of the reversals remained undetected, and a full 69% of the participants failed to detect at least one of two changes. In addition, participants often constructed coherent and unequivocal arguments supporting the opposite of their original position. These results suggest a dramatic potential for flexibility in our moral attitudes, and indicates a clear role for self-attribution and post-hoc rationalization in attitude formation and change.
14.	Hall, Lars, et al. (författare) Magic at the marketplace: Choice blindness for the taste of jam and the smell of tea. 2010 Ingår i: Cognition. - : Elsevier BV. - 0010-0277. ; 117, s. 54-61 Tidskriftsartikel (refereegranskat)abstract We set up a tasting venue at a local supermarket and invited passerby shoppers to sample two different varieties of jam and tea, and to decide which alternative in each pair they preferred the most. Immediately after the participants had made their choice, we asked them to again sample the chosen alternative, and to verbally explain why they chose the way they did. At this point we secretly switched the contents of the sample containers, so that the outcome of the choice became the opposite of what the participants intended. In total, no more than a third of the manipulated trials were detected. Even for remarkably different tastes like Cinnamon-Apple and bitter Grapefruit, or the smell of Mango and Pernod was no more than half of all trials detected, thus demonstrating considerable levels of choice blindness for the taste and smell of two different consumer goods.
15.	Hall, Lars, et al. (författare) Recomposing the Will : Distributed motivation and computer mediated extrospection. 2013 Ingår i: Decomposing the will. - Oxford : Oxford University Press. - 9780199746996 - 9780199332502 ; , s. 298-324 Bokkapitel (populärvet., debatt m.m.)
16.	Henningsson, Maria, et al. (författare) Dynamic Mapping of Diesel Engine through System identification 2012 Ingår i: Identification for Automotive Systems. - London : Springer London. - 0170-8643. ; LNCIS 418, s. 223-239 Konferensbidrag (refereegranskat)abstract From a control design point of view, modern diesel engines are dynamic, nonlinear, MIMO systems. This paper presents a method to find low-complexity black-box dynamic models suitable for model predictive control (MPC) of NOx and soot emissions based on on-line emissions measurements. A four-input-five-output representation of the engine is considered, with fuel injection timing, fuel injection duration, exhaust gas recirculation (EGR) and variable geometry turbo (VGT) valve positions as inputs, and indicated mean effective pressure, combustion phasing, peak pressure derivative, NOx emissions, and soot emissions as outputs. Experimental data were collected on a six-cylinder heavy-duty engine at 30 operating points. The identification procedure starts by identifying local linear models at each operating point. To reduce the number of dynamic models necessary to describe the engine dynamics, Wiener models are introduced and a clustering algorithm is proposed. A resulting set of two to five dynamic models is shown to be able to predict all outputs at all operating points with good accuracy.
17.	Henningsson, Maria, et al. (författare) Dynamic Mapping of Diesel Engine through System Identification 2010 Ingår i: Proceedings of the 2010 American Control Conference. - 2378-5861 .- 0743-1619. - 9781424474264 - 9781424474271 ; , s. 3015-3020 Konferensbidrag (refereegranskat)abstract From a control design point of view, modern diesel engines are dynamic, nonlinear, MIMO systems. This paper presents a method to find low-complexity black-box dynamic models suitable for model predictive control (MPC) of NOx and soot emissions based on on-line emissions measurements. A four-input-five-output representation of the engine is considered, with fuel injection timing, fuel injection duration, exhaust gas recirculation (EGR) and variable geometry turbo (VGT) valve positions as inputs, and indicated mean effective pressure, combustion phasing, peak pressure derivative, NOx emissions, and soot emissions as outputs. Experimental data were collected on a six-cylinder heavy-duty engine at 30 operating points. The identification procedure starts by identifying local linear models at each operating point. To reduce the number of dynamic models necessary to describe the engine dynamics, Wiener models are introduced and a clustering algorithm is proposed. A resulting set of two to five dynamic models is shown to be able to predict all outputs at all operating points with good accuracy.
18.	Henningsson, Maria, et al. (författare) Multiple-Input Multiple-Output Model Predictive Control of a Diesel Engine 2010 Ingår i: IFAC Proceedings Volumes (IFAC-PapersOnline). - 2405-8963. ; 43:7, s. 131-136 Tidskriftsartikel (refereegranskat)abstract Traditionally, diesel engine control has had to rely on indirect feedback variables and empirical open-loop maps because direct measurements of the variables representing high-level objectives, such as emissions, have not been available in production engines. With new sensors being developed, the opportunity opens to design the controller directly based on high-level objectives. In this paper, we propose to use model predictive control as a systematic way to go directly from high-level specifications to a control algorithm. The controller uses four actuator variables and five measured variables and is based on a model obtained through system identification. Experimental results on a six-cylinder heavy-duty engine around a fixed operating point demonstrate the potential of the control scheme.
19.	Ilderton, Anton, et al. (författare) Pair annihilation in laser pulses : Optical versus x-ray free-electron laser regimes 2011 Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - New York, N.Y. : Publ. by the American Physical Society through the American Institute of Physics. - 1050-2947 .- 1094-1622. ; 84:3, s. 032119- Tidskriftsartikel (refereegranskat)abstract We discuss the theory and phenomenology of pair annihilation, within an ultrashort laser pulse, to a single photon. The signature of this process is the unidirectional emission of single photons with a fixed energy. We show that the cross section is significantly larger than for two-photon pair annihilation in vacuum, with x-ray free-electron laser parameters admitting a much clearer signal than optical beams.
20.	Johansson, Anders, 1985, et al. (författare) Experimental Investigation of Soot in a Spray-Guided Single Cylinder GDI Engine Operating in a Stratified Mode 2013 Ingår i: SAE Technical Papers. - 400 Commonwealth Drive, Warrendale, PA, United States : SAE International. - 0148-7191 .- 2688-3627. ; 6 Tidskriftsartikel (refereegranskat)abstract Forthcoming reductions in legal limits for emissions of particle matter (PM) from direct injection engines have increased the need for understanding particle distributions in the engines and the factors affecting them. Therefore, in the presented study the influence on PM-emissions of potentially important factors (fuel injection pressure, load, speed and 50% mass fraction burned phasing) on particle mass, number and size distributions were experimentally investigated. The experimental system was a spray-guided, direct injection, single-cylinder research engine operated in stratified charge mode (using gasoline with 10% ethanol as fuel), under five load and speed settings that are appropriate for stratified combustion. The particle distributions obtained from operating the engine in homogeneous combustion and stratified combustion modes were also compared. The particle distributions were measured using a Cambustion DMS500 fast particle analyzer in combination with a Dekati FPS4000 fine particle sampler and a thermodenuder in all tests except the comparison of distributions under stratified and homogeneous combustion conditions. The sampling system was designed to remove as much of the volatile unburned hydrocarbons as possible in order to sample mostly solid particles. Under all of the stratified operating conditions studied, the results indicate that the particle distribution has a characteristic shape with a tail and one large peak. The operating speed significantly affected the size of the largest particles and the quantity of the particles represented by the tail. An almost linear, positive relationship was found between the load and particle number. Increasing the fuel injection pressure reduced particle numbers whereas combustion phasing had no significant observed effects. More particles were generated in stratified combustion mode than in homogeneous mode.
21.	Johansson, Anders, 1985, et al. (författare) Measurements of particulate size distribution from a GDI engine using a nafion dryer and a DMS500 without sample dilution 2014 Ingår i: FISITA 2014 World Automotive Congress - Proceedings. Konferensbidrag (refereegranskat)abstract Several types of engine exhaust contain moisture that must be maintained in gaseous state when sampling particulates to prevent potential destruction of the particles or damage to the measurement apparatus. This is normally achieved by diluting the sample in order to reduce the partial pressure, thus avoiding condensation. When measuring size distributions of particulates emitted from a gasoline engine, a dilution ratio of at least 5:1 is recommended. However, in some operating modes (e.g. lean homogenous modes) or measurement locations (e.g. downstream of a particulate filter) this ratio can be too high for high-resolution measurements due to the low levels of particulates. The presented study investigates the potential for using a nafion dryer to remove water from the exhaust instead of diluting the sample. An electrical mobility measurement device, a Cambustion DMS500 mk II, was operated without diluting the exhaust gases but with a nafion dryer to remove water from the exhaust. These dryers are commonly used for measuring particulates in airborne aerosols, but no information has been found in the open literature on their application in engine research. The sampling system was connected to a four cylinder SGDI-engine operating in modes that generate small amount of particulates. Samples were taken in four operating conditions, downstream of the catalyst. Overall losses in the complete system and components of the system were determined by tests with an artificially generated aerosol. Factors such as particulate losses, system performance and sample manipulation are discussed. Particulate size distributions were successfully recorded in operating regimes in which they are difficult to measure with conventional sampling systems using the required dilution. Particulate losses were found to be small in the nafion dryer but large in the heated hose prior to the nafion dryer.
22.	Johansson, Petter, 1983-, et al. (författare) A wider perspective on research utilisation at technical universities in Sweden 2013 Konferensbidrag (refereegranskat)abstract There is an ongoing discussion concerning how academic research is utilized in industry and society and how this can be measured and encouraged through performance based resource allocation. In Sweden, this discussion also concerns the professor’s privilege, meaning that much of the utilization activity can occur without the knowl-edge of the administration and management of their universities.This study has been conducted with the aim of get-ting an insight into and describing the research utiliza-tion activity at technical universities in Sweden. The study has been conducted through interviews with researchers at 20 different research divisions in the field of energy at two universities in the Stockholm region.The study shows that there is an overall high level of collaborative aand entrepreneurial activity in the divisions, but that large variations are evident. The dif-ferences between the research divisions’ potential and willingness to utilize research in industry and society depend both on technological conditions and personal preferences. Divisions that lack high levels of indus-trial collaborations and entrepreneurial activity have shown higher levels of collaborations with governmental agencies.The results also show that performance indicators such as patents and business start-ups do not apply well to all research divisions. These indicators only reflect commercialization aspects and therefore only show part of the utilization activity for certain types of research divisions.
23.	Johansson, Petter, et al. (författare) A wider perspective on research utilisation at technical universities in Sweden 2013 Konferensbidrag (refereegranskat)abstract There is an ongoing discussion concerning how academic research is being utilised in industry and society and how this can be measured and encouraged by using performance based resource allocation. The professor privilege in Sweden causes many utilisation activities to occur informally and directly with partners outside of academia, with the consequence that university management may lack full insight into the utilisation processes and the processes become difficult to measure. To contribute to this lack of knowledge, this study has been undertaken to describe how current utilisation-activities at a technical university in Sweden look like from the researchers’ perspective. Attitudes and possibilities to utilise research in society and industry have been studied through interviews with researchers in 16 divisions active in the field of energy.The results show a large variety among the studied divisions in both capabilities and attitudes towards utilising research. Divisions that mainly collaborate with industrial partners instead of governmental organisations turns out to have more entrepreneurial activity in form of patenting and business start-ups compared to divisions that mostly collaborate with governmental organisations. This indicates that the usage of key performance indicators (KPIs), such as patents and business start-ups, would favor divisions with mostly industrial collaborations while unfavorably portraying divisions with mostly governmental collaborations. These KPIs are therefore unfit to use for resource allocation purposes for every type of research division.
24.	Johansson, Petter, et al. (författare) Auditory feedback of one's own voice is used for high-level semantic monitoring : the "self-comprehension" hypothesis 2014 Ingår i: Frontiers in Human Neuroscience. - Lausanne : Fronteirs. - 1662-5161. ; 8:166 Tidskriftsartikel (refereegranskat)
25.	Johansson, Petter (författare) Changing Minds by Tracking Eyes : Dynamical Systems, Gaze and Moral Decisions 2013 Ingår i: Proceedings of the 35th Annual Conference of the Cognitive Science Society. - Austin, TX : Cognitive Science Society, Inc.. ; , s. 1115-1120 Bokkapitel (refereegranskat)
26.	Johansson, Petter, et al. (författare) Choice Blindness and Preference Change: You Will Like This Paper Better If You (Believe You) Chose to Read It! 2014 Ingår i: Journal of Behavioral Decision Making. - : Wiley. - 1099-0771 .- 0894-3257. ; 27:3, s. 281-289 Tidskriftsartikel (refereegranskat)abstract Choice blindness is the finding that participants both often fail to notice mismatches between their decisions and the outcome of their choice and, in addition, endorse the opposite of their chosen alternative. But do these preference reversals also carry over to future choices and ratings? To investigate this question, we gave participants the task of choosing which of a pair of faces they found most attractive. Unknown to them, we sometimes used a card trick to exchange one face for the other. Both decision theory and common sense strongly suggest that most people would easily notice such a radical change in the outcome of a choice. But that was not the case: no more than a third of the exchanges were detected by the participants. We also included a second round of choices using the same face pairs, and two stages of post-choice attractiveness ratings of the faces. This way we were able to measure preference strength both as choice consistency and by looking at measures of rating differences between chosen and rejected options. We found that the initially rejected faces were chosen more frequently in the second choice, and the perceived attractiveness of these faces was increased even in uncoupled individual ratings at the end of the experiment. This result is discussed in relation to Chen and Risen's recent criticism of the Free Choice Paradigm, as it shows that choices can affect future preferences. Copyright (c) 2013 John Wiley & Sons, Ltd.
27.	Johansson, Petter, et al. (författare) Choice blindness and the non-unitary nature of the mind (Commentary on von Hippel and Trivers) 2011 Ingår i: Behavioral and Brain Sciences. - 1469-1825. ; 34:1, s. 28-29 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract Abstract in Undetermined Experiments on choice blindness support von Hippel & Trivers's (VH&T's) conception of the mind as fundamentally divided, but they also highlight a problem for VH&T's idea of non-conscious self-deception: If I try to trick you into believing that I have a certain preference, and the best way is to also trick myself, I might actually end up having that preference, at all levels of processing.
28.	Johansson, Petter, 1983-, et al. (författare) Critical factors in different phases of the Swedish heat pump market development 2013 Ingår i: The Industrial. Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract Since the heat pump was invented in the mid 19th century it has been dependent on technological development of principally five main mechanical components as well as on economic, social and political factors to penetrate the market. It can therefore be useful to describe the heat pump as a sociotechnical system consisting of different components, or sub-systems, to understand how all components must align to achieve market acceptance. While technological and social conditions affecting the heat pump demand are currently in the process of aligning in several European emerging and growing markets, the Swedish heat pump market is slowing down due to signs of market saturation.Sweden has been a pioneering nation in the field of heat pumps and the heat pump has had a larger market impact in Sweden than anywhere else. Since the birth of the market in the 1970s it has gone through several phases: Growth from 1979, a market collapse in the mid 1980s, a strong growth once more from 1995 to 2006, and a recent decline in sales. This article studies these shifts in market demand by answering the research question: What critical factors have affected the heat pump market in Sweden during different phases of its development? These critical factors have been mapped out through interviews with researchers and industry representatives together with an extensive literature review and analysis of secondary available data such as statistical reviews and research program records.This article arguments that the market demand has correlated to the alignment of factors in the heat pump sociotechnical system, and that too much focus has previously been on subsidies when trying to explain the causes behind the heat pump market development in Sweden. Subsidies has only been one factor out of many. Understanding the market development of energy technologies such as heat pumps from a sociotechnical perspective is useful knowledge for practitioners and policy makers engaged in emerging energy markets as well as researchers in the field.
29.	Johansson, Petter, 1983-, et al. (författare) Impact of Convective Heat Transfer Mechanism in Latent Heat Storage Modeling 2012 Konferensbidrag (refereegranskat)
30.	Johansson, Pär, 1986, et al. (författare) Interior Insulation Retrofit of a Brick Wall Using Vacuum Insulation Panels: Design of a Laboratory Study to Determine the Hygrothermal Effect on Existing Structure and Wooden Beam Ends 2013 Ingår i: 12th International Conference on Thermal Performance of the Exterior Envelopes of Whole Buildings, Clearwater, United States, 1-5 December 2013. Konferensbidrag (refereegranskat)abstract The increasing demand on energy-efficient buildings requires energy retrofitting measures in the existing building stock. Conventional thermal insulation materials, such as mineral wool and expanded polystyrene (EPS), demand a thick layer of insulation to reach the energy targets. Vacuum insulation panels (VIPs) are a novel thermal insulation component with 5-10 times lower thermal conductivity than the conventional insulation materials, depending on the VIP ageing state. The thermal transmittance of the building envelope can thereby be substantially reduced using a limited additional insulation thickness. Previous research has shown that interior energy retrofitting of exterior walls may increase the moisture content of the walls and increases the risk of freeze-thaw damages at the surface. This study analyzes the hygrothermal consequences on a 250 mm (9.8 in.) thick brick wall retrofitted with 20 mm (0.8 in.) interior VIP (glued directly on the plastered brick wall). Hygrothermal simulations in WUFI 2D are used to study the hygrothermal effects by different material properties and boundary conditions. Apart from the material properties, the amount of driving rain available at the surface is the most important influential parameter in the simulations. The conclusions from this study are used to plan a measurement study in a climate simulator where driving rain and solar radiation will be simulated.
31.	Johansson, Pär, 1986, et al. (författare) Interior insulation retrofit of a historical brick wall using vacuum insulation panels: Hygrothermal numerical simulations and laboratory investigations 2014 Ingår i: Building and Environment. - : Elsevier BV. - 0360-1323. ; 79, s. 31-45 Tidskriftsartikel (refereegranskat)abstract Old listed buildings need to be retrofitted to reduce the energy use for heating. The possible thickness of the insulation layer is limited by the existing construction. Vacuum insulation panels (VIPs) require less thickness than conventional insulation materials to reach the same thermal resistance. Therefore, it could be more appropriate to use VIPs than conventional insulation materials when retrofitting the building envelope of listed buildings. The aim of this study is to investigate the hygrothermal performance of a brick wall with wooden beam ends after it was insulated on the interior with VIPs. One- and two-dimensional hygrothermal numerical simulations were used to design a laboratory study in a large-scale building envelope climate simulator. The wall was exposed to driving rain on the exterior surface and a temperature gradient. The relative humidity in the wall increased substantially when exposed to driving rain. The moisture content in the wooden beams also increased. There was no significant difference between the relative humidity in the wooden beam ends for the cases with and without VIPs. However, it was found that the reduced temperature in the brick after the VIPs were added led to a higher relative humidity in the wooden beams. It was also clear that when VIPs were added to the interior, the drying capacity to that side of the wall was substantially reduced. Finally, calculations of the U-value showed a large potential to reduce the energy use using VIPs on the interior of brick walls.
32.	Johansson, Petter, 1983- (författare) Introducing a socio-technical analysis framework : Analysing the Swedish heat pump development in four steps 2014 Konferensbidrag (refereegranskat)
33.	Johansson, Petter, 1981- (författare) On the topology of the coamoeba 2014 Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract In this thesis we study the topology and geometry of the coamoeba of an algebraic variety V. The strategy that we use is to relate the coamoebas corresponding to the initial varieties of V to the coamoeba of V. We also define an analogue of the Ronkin function for the coamoeba and give an explicit formula for it.
34.	Johansson, Petter, et al. (författare) Preference change through choice 2012 Ingår i: Neuroscience of Preference and Choice. - 9780123814326 ; , s. 121-141 Bokkapitel (refereegranskat)
35.	Johansson, Pär, 1986, et al. (författare) Retrofitting a brick wall using vacuum insulation panels: measured hygrothermal effect on the existing structure 2014 Ingår i: Proceedings of the 10th Nordic Symposium on Building Physics, June 15-19, 2014, Lund, Sweden. Konferensbidrag (refereegranskat)abstract Old listed buildings need to be retrofitted to reduce the energy use for heating. Vacuum insulation panels (VIPs) require less thickness than conventional insulation materials to reach the same thermal resistance. The aim of this paper is to investigate the hygrothermal performance of a brick wall with wooden beam ends after it was insulated on the interior with VIPs. The paper presents the first part of a laboratory study where a brick wall was built in the laboratory and exposed to simulated driving rain. Different measurement techniques of the relative humidity in the construction have been used. The relative humidity in the wall increased substantially when exposed to driving rain. The moisture content in the wooden beams also increased. However, it has not been possible to fully determine the influence by the added insulation layer. It is clear that the drying capacity to the interior side is substantially reduced. These investigations are ongoing and will be reported in future publications.
36.	Johansson, Petter (författare) The argument cycle and the coamoeba 2013 Ingår i: Complex Variables and Elliptic Equations. - : Informa UK Limited. - 1747-6933 .- 1747-6941. ; 58:3, s. 373-384 Tidskriftsartikel (refereegranskat)abstract We investigate the coamoeba of a complex algebraic variety V???(C*) n through the study of initial forms of the defining ideal. By use of a universal Grobner basis, we prove that the closure of the coamoeba is included in the union of coamoebas corresponding to all initial ideals. We also study complete intersections V of dimension n/2 more closely to get a lower bound for the multiplicity in V of a given point ? on the n:th torus. For this purpose, we associate a certain algebraic cycle, the argument cycle, to V and ? , and study its homology. In particular, we give a method to approximate the coamoeba when n?=?2.
37.	Karlsson, Edvin, et al. (författare) The phylogeographic pattern of Francisella tularensis in Sweden indicates a Scandinavian origin of Eurosiberian tularaemia 2013 Ingår i: Environmental Microbiology. - : Wiley. - 1462-2912 .- 1462-2920. ; 15:2, s. 634-645 Tidskriftsartikel (refereegranskat)abstract Previous studies of the causative agent of tularaemia, Francisella tularensis have identified phylogeographic patterns suggestive of environmental maintenance reservoirs. To investigate the phylogeography of tularaemia in Sweden, we selected 163 clinical isolates obtained during 1995-2009 in 10 counties and sequenced one isolate's genome to identify new genetic markers. An improved typing scheme based on two indels and nine SNPs was developed using hydrolysis or TaqMan MGB probe assays. The results showed that much of the known global genetic diversity of F. tularensis subsp. holarctica is present in Sweden. Thirteen of the 163 isolates belonged to a new genetic group that is basal to all other known members of the major genetic clade B.I, which is spread across the Eurosiberian region. One hundred and twenty-five of the 163 Swedish isolates belonged to B.I, but individual clades' frequencies differed from county to county (P < 0.001). Subsequent analyses revealed a correlation between genotype variation over time and recurrent outbreaks at specific places, supporting the 'maintenance reservoir' environmental maintenance hypothesis. Most importantly, the findings reveal the presence of diverse source populations of F. tularensis subsp. holarctica in Sweden and suggest a historical spread of the disease from Scandinavia to other parts of Eurosiberia.
38.	Katsilieris, Fotios, et al. (författare) Demonstration of multi-robot search and secure 2010 Konferensbidrag (refereegranskat)abstract We consider the search and secure problem, where intruders are to be detected in a bounded area without allowing them to escape. The problem is tackled by representing the area to be searched as a traversability graph, which is reduced to a tree graph by placing stationary robots to remove loops. The search of the remaining tree is performed using two strategies that represent different trade-offs between the needed search time and the number of robots. Proof of correctness is provided for these two strategies. The proposed algorithm was implemented and demonstrated as part of an outfield experiment involving a team of Rotundus spherical robots.
39.	Lind, Andreas, et al. (författare) Auditory feedback of one's own voice is used for high-level semantic monitoring: the "self-comprehension" hypothesis. 2014 Ingår i: Frontiers in Human Neuroscience. - : Frontiers Media SA. - 1662-5161. ; 8 Tidskriftsartikel (refereegranskat)abstract What would it be like if we said one thing, and heard ourselves saying something else? Would we notice something was wrong? Or would we believe we said the thing we heard? Is feedback of our own speech only used to detect errors, or does it also help to specify the meaning of what we say? Comparator models of self-monitoring favor the first alternative, and hold that our sense of agency is given by the comparison between intentions and outcomes, while inferential models argue that agency is a more fluent construct, dependent on contextual inferences about the most likely cause of an action. In this paper, we present a theory about the use of feedback during speech. Specifically, we discuss inferential models of speech production that question the standard comparator assumption that the meaning of our utterances is fully specified before articulation. We then argue that auditory feedback provides speakers with a channel for high-level, semantic "self-comprehension". In support of this we discuss results using a method we recently developed called Real-time Speech Exchange (RSE). In our first study using RSE (Lind et al., in press) participants were fitted with headsets and performed a computerized Stroop task. We surreptitiously recorded words they said, and later in the test we played them back at the exact same time that the participants uttered something else, while blocking the actual feedback of their voice. Thus, participants said one thing, but heard themselves saying something else. The results showed that when timing conditions were ideal, more than two thirds of the manipulations went undetected. Crucially, in a large proportion of the non-detected manipulated trials, the inserted words were experienced as self-produced by the participants. This indicates that our sense of agency for speech has a strong inferential component, and that auditory feedback of our own voice acts as a pathway for semantic monitoring. We believe RSE holds great promise as a tool for investigating the role of auditory feedback during speech, and we suggest a number of future studies to serve this purpose.
40.	Lind, Andreas, et al. (författare) Speakers' Acceptance of Real-Time Speech Exchange Indicates That We Use Auditory Feedback to Specify the Meaning of What We Say. 2014 Ingår i: Psychological Science. - : SAGE Publications. - 0956-7976 .- 1467-9280. ; 25:6, s. 1198-1205 Tidskriftsartikel (refereegranskat)abstract Speech is usually assumed to start with a clearly defined preverbal message, which provides a benchmark for self-monitoring and a robust sense of agency for one's utterances. However, an alternative hypothesis states that speakers often have no detailed preview of what they are about to say, and that they instead use auditory feedback to infer the meaning of their words. In the experiment reported here, participants performed a Stroop color-naming task while we covertly manipulated their auditory feedback in real time so that they said one thing but heard themselves saying something else. Under ideal timing conditions, two thirds of these semantic exchanges went undetected by the participants, and in 85% of all nondetected exchanges, the inserted words were experienced as self-produced. These findings indicate that the sense of agency for speech has a strong inferential component, and that auditory feedback of one's own voice acts as a pathway for semantic monitoring, potentially overriding other feedback loops.
41.	Mandenius, Carl-Fredrik, et al. (författare) Toward Preclinical Predictive Drug Testing for Metabolism and Hepatotoxicity by Using In Vitro Models Derived from Human Embryonic Stem Cells and Human Cell Lines - A Report on the Vitrocellomics EU-project 2011 Ingår i: ATLA-ALTERNATIVES TO LABORATORY ANIMALS. - : Fund for Replacement of Animals in Medical Experiments; 1999. - 0261-1929 .- 2632-3559. ; 39:2, s. 147-171 Tidskriftsartikel (refereegranskat)abstract Drug-induced liver injury is a common reason for drug attrition in late clinical phases, and even for post-launch withdrawals. As a consequence, there is a broad consensus in the pharmaceutical industry, and within regulatory authorities, that a significant improvement of the current in vitro test methodologies for accurate assessment and prediction of such adverse effects is needed. For this purpose, appropriate in vivo-like hepatic in vitro models are necessary, in addition to novel sources of human hepatocytes. In this report, we describe recent and ongoing research toward the use of human embryonic stem cell (hESC)-derived hepatic cells, in conjunction with new and improved test methods, for evaluating drug metabolism and hepatotoxicity. Recent progress on the directed differentiation of human embryonic stem cells to the functional hepatic phenotype is reported, as well as the development and adaptation of bioreactors and toxicity assay technologies for the testing of hepatic cells. The aim of achieving a testing platform for metabolism and hepatotoxicity assessment, based on hESC-derived hepatic cells, has advanced markedly in the last 2-3 years. However, great challenges still remain, before such new test systems could be routinely used by the industry. In particular, we give an overview of results from the Vitrocellomics project (EU Framework 6) and discuss these in relation to the current state-of-the-art and the remaining difficulties, with suggestions on how to proceed before such in vitro systems can be implemented in industrial discovery and development settings and in regulatory acceptance.
42.	Nilsson Kajermo, Kerstin, et al. (författare) Swedish Translation, Adaptation and Psychometric Evaluation of the Context Assessment Index (CAI) 2013 Ingår i: Worldviews on Evidence-Based Nursing. - : Wiley-Blackwell. - 1545-102X .- 1741-6787. ; 10:1, s. 41-50 Tidskriftsartikel (refereegranskat)abstract BACKGROUND: The strength of and relationship between the fundamental elements context, evidence and facilitation of the PARIHS framework are proposed to be key for successful implementation of evidence into healthcare practice. A better understanding of the presence and strength of contextual factors is assumed to enhance the opportunities of adequately developing an implementation strategy for a specific setting. A tool for assessing context-The Context Assessment Index (CAI)-was developed and published 2009. A Swedish version of the instrument was developed and evaluated among registered nurses. This work forms the focus of this paper. PURPOSE: The purpose of this study was to translate the CAI into Swedish, adapt the instrument for use in Swedish healthcare practice and assess its psychometric properties. METHODS: The instrument was translated and back-translated to English. The feasibility of items and response scales were evaluated through think aloud interviews with clinically active nurses. Psychometric properties were evaluated in a sample of registered nurses (n = 373) working in a variety of healthcare organisations in the Stockholm area. Item and factor analyses and Cronbach's alpha were computed to evaluate internal structure and internal consistency. RESULT: Sixteen items were modified based on the think aloud interviews and to adapt the instrument for use in acute care. A ceiling effect was observed for many items and the originally identified 37 item five-factor model was not confirmed. Item analyses showed an overlap between factors and indicated a one-dimensional scale. DISCUSSION: The Swedish version of the CAI has a wider application than the original instrument. This might have contributed to the differences in factor structure. Different opportunities for further development of the scale are discussed. CONCLUSIONS: Further evaluation of the psychometric properties of the CAI is required.
43.	Parada, Giovanny A., et al. (författare) Tuning the Electronics of Bis(tridentate)ruthenium(II) Complexes with Long-Lived Excited States : Modifications to the Ligand Skeleton beyond Classical Electron Donor or Electron Withdrawing Group Decorations 2013 Ingår i: Inorganic Chemistry. - : American Chemical Society (ACS). - 0020-1669 .- 1520-510X. ; 52:9, s. 5128-5137 Tidskriftsartikel (refereegranskat)abstract A series of homoleptic bis(tridentate) [Ru-(L)(2)](2+) (1, 3) and heteroleptic [Ru(L)(dqp)](2+) complexes (2, 4) [L = dqxp (1, 2) or dNinp (3, 4); dqxp = 2,6-di(quinoxalin-5-yl)pyridine, dNinp = 2,6-di(N-7-azaindol-1-yl)pyridine, dqp = 2,6-di(quinolin-8-yl)pyridine) was prepared and in the case of 2 and 4 structurally characterized. The presence of dqxp and dNinp in 1-4 result in anodically shifted oxidation potentials of the Ru3+/2+ couple compared to that of the archetypical [Ru(dqp)(2)](2+) (5), most pronounced for [Ru(dqxp)(2)](2+) (1) with a shift of +470 mV. These experimental findings are corroborated by DFT calculations, which show contributions to the complexes' HOMOs by the polypyridine ligands, thereby stabilizing the HOMOs and impeding electron extraction. Complex 3 exhibits an unusual electronic absorption spectrum with its lowest energy maximum at 382 nm. TD-DFT calculations suggest that this high-energy transition is caused by a localization of the LUMO on the central pyridine fragments of the dNinp ligands in 3, leaving the lateral azaindole units merely spectator fragments. The opposite is the case in 1, where the LUMO experiences large stabilization by the lateral quinorralines. Owing to the differences in LUMO energies, the complexes' reduction potentials differ by about 900 mV [E-1/2(1(2+/1+)) = -1.17 V, E-c,E-p(3(2+/1+)) = -2.06 V vs Fc(+/0)]. As complexes 1-4 exhibit similar excited state energies of around 1.80 V, the variations of the lateral heterocycles allow the tuning of the complexes' excited state oxidation strengths over a range of 900 mV. Complex 1 is the strongest excited state oxidant of the series, exceeding even [Ru(bpy)(3)](2+) by more than 200 mV. At room temperature, complex 3 is nonemissive, whereas complexes 1, 2, and 4 exhibit excited state lifetimes of 255, 120, and 1570 ns, respectively. The excited state lifetimes are thus somewhat shortened compared to that of 5 (3000 ns) but still acceptable to qualify the complexes as photosensitizers in light-induced charge-transfer schemes, especially for those that require high oxidative power.
44.	Pärnamets, Philip, et al. (författare) Changing minds by tracking eyes. 2013 Konferensbidrag (refereegranskat)
45.	Pärnamets, Philip, et al. (författare) Changing minds by tracking eyes: Biasing moral decisions by interrupting gaze 2013 Ingår i: Journal of Eye Movement Research. - 1995-8692. ; 6:3, s. 166-166 Konferensbidrag (refereegranskat)
46.	Pärnamets, Philip, et al. (författare) Changing minds by tracking eyes: Dynamical systems, gaze and moral decisions 2013 Ingår i: Proceedings of the 35th Annual Conference of the Cognitive Science Society. Konferensbidrag (refereegranskat)abstract Decision making is a dynamic process. Alternatives compete over time, and this competition plays out in sensorimotor processes. This is true not just for perceptual decisions or simple categorisation tasks, but also for moral decisions, which are the outcome of a complex interplay of intuition, emotion and reasoning. In this experiment, we first establish a descriptive and causal link between gaze and moral judgement. We then use eye movements to track the time course of participants’ moral decisions and show that by interrupting their decision process based on their gaze position, we are able to influence what they decide. We interpret this as evidence for a dynamical systems view of decision making and argue that our results provide new insights into how judgements are reached and constructed in our embodied minds.
47.	Pärnamets, Philip, et al. (författare) Objective markers of detection process during a choice blindness task 2012 Konferensbidrag (refereegranskat)
48.	Roupé, Mattias, 1975, et al. (författare) Using the human body as an interactive interface for navigation in VR models 2012 Ingår i: CAADRIA 2012, Beyond Codes & Pixels, Chennai, India. - 9789881902634 ; 17, s. 79-88 Konferensbidrag (refereegranskat)abstract The use of Virtual Reality (VR) and interactive real-timerendering in urban planning and building design are becoming moreand more common. However, the integration of VR in the urbanplanning process suffers from the complicated interaction handling ofthe virtual environment. In particular, people unfamiliar to gamingenvironments and computers are less prone to interact with a VRvisualization using keyboard and mouse as controlling devices. Thispaper addresses this issue by presenting an implementation of theXBOX 360 Kinect sensor system, which uses the human body tointeract with the virtual environment. This type of interaction interfaceenables a more natural and user-friendly way of interacting with thevirtual environment. The validation of the system shows thatrespondents perceived the interface as non-demanding and easy to use.The implemented interface to switch between different architectureproposals gave a better understanding and spatial reasoning for therespondent. The study also shows that males perceived the system asmore demanding than females. The users also associated andcompared their body with virtual environment, which could indicatethat they used their body during spatial reasoning. This type of spatialreasoning has been agued to enhance the spatial-perception.
49.	Samuelsson, Håkan, 1976, et al. (författare) A Ronkin type function for coamoebas 2014 Annan publikation (övrigt vetenskapligt/konstnärligt)abstract The Ronkin function plays a fundamental role in the theory of amoebas. We introduce an analogue of the Ronkin function in the setting of coamoebas. It turns out to be closely related to a certain toric arrangement known as the shell of the coamoeba and we use our Ronkin type function to obtain some properties of it.
50.	Sjödin, Andreas, et al. (författare) Genome characterisation of the genus Francisella reveals insight into similar evolutionary paths in pathogens of mammals and fish 2012 Ingår i: BMC Genomics. - : Springer Science and Business Media LLC. - 1471-2164. ; 13, s. 268- Tidskriftsartikel (refereegranskat)abstract Background: Prior to this study, relatively few strains of Francisella had been genome-sequenced. Previously published Francisella genome sequences were largely restricted to the zoonotic agent F. tularensis. Only limited data were available for other members of the Francisella genus, including F. philomiragia, an opportunistic pathogen of humans, F. noatunensis, a serious pathogen of farmed fish, and other less well described endosymbiotic species. Results: We determined the phylogenetic relationships of all known Francisella species, including some for which the phylogenetic positions were previously uncertain. The genus Francisella could be divided into two main genetic clades: one included F. tularensis, F. novicida, F. hispaniensis and Wolbachia persica, and another included F. philomiragia and F. noatunensis. Some Francisella species were found to have significant recombination frequencies. However, the fish pathogen F. noatunensis subsp. noatunensis was an exception due to it exhibiting a highly clonal population structure similar to the human pathogen F. tularensis. Conclusions: The genus Francisella can be divided into two main genetic clades occupying both terrestrial and marine habitats. However, our analyses suggest that the ancestral Francisella species originated in a marine habitat. The observed genome to genome variation in gene content and IS elements of different species supports the view that similar evolutionary paths of host adaptation developed independently in F. tularensis (infecting mammals) and F. noatunensis subsp. noatunensis (infecting fish).

Skapa referenser, mejla, bekava och länka

Länka till träfflistan

Träfflista för sökning "WFRF:(Johansson Petter) srt2:(2010-2014)"

Avgränsa träffmängd

År