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  • Hadjikhani, Amjad
    et al.
    Department of Business Studies, Uppsala University, Uppsala, Sweden.
    Leite, Emilene
    Department of Business Studies, Uppsala University, Uppsala, Sweden.
    Pahlberg, Cecilia
    Department of Business Studies, Uppsala University, Uppsala, Sweden.
    Business and Socio-Political Interaction in International Service Projects: The Case of Brazil2019In: MIR: Management International Review, ISSN 0938-8249, E-ISSN 1861-8901, Vol. 59, no 1, p. 171-200Article in journal (Refereed)
    Abstract [en]

    Building on a business network perspective, the aim of this paper is to present a theoretical view for studying service MNEs in ICT (information communication technology) projects centred on the improvement of public services. The four inter-related concepts of cooperation, legitimacy, commitment and knowledge are applied in the analysis of two projects. Defining the projects as object-based services, the study manifests how service MNEs manage three types of actors (business, politi-cal and social) having their legitimacy in different systems. The cases illustrate cross-border activities where MNEs from Sweden, Spain and China join forces in Brazil with local business, social and political actors and cooperate to strengthen their competitive market position. The study concludes that successful cooperation is partially explained by the management’s ability to incorporate business resources into the needs of the socio-political actors. Furthermore, in object-based services, which are not similar to long-term business relationships, the three involved par-ties advance different types of relationships within a loose network structure. A key implication is that extensive public–private relationships are needed even when MNEs enjoy an established position in a foreign market.

  • Moll, Jonas
    et al.
    Department of Information Technology, Uppsala University, Uppsala, Sweden.
    Sallnäs Pysander, Eva-Lotta
    Department of Media Technology and Interaction Design, KTH Royal Institute of Technology, Stockholm, Sweden.
    Haptic communicative functions and their effects on communication in collaborative multimodal virtual environments2017In: Proceedings 13th SweCog Conference, Högskolan i Skövde , 2017, p. 63-64Conference paper (Refereed)
  • Frid, Emma
    et al.
    Sound and Music Computing, CSC, KTH Royal Institute of Technology, Stockholm, Sweden.
    Bresin, Roberto
    Sound and Music Computing, CSC, KTH Royal Institute of Technology, Stockholm, Sweden.
    Moll, Jonas
    Interaction Design, CSC, KTH Royal Institute of Technology, Stockholm, Sweden.
    Sallnäs Pysander, Eva-Lotta
    Interaction Design, CSC, KTH Royal Institute of Technology, Stockholm, Sweden.
    Sonification of haptic interaction in a virtual scene2014In: SMC Sweden 2014 Sound and Music Computing: Bridging science, art, and industry / [ed] Roberto Bresin, Stockholm: KTH Royal Institute of Technology , 2014, p. 14-16Conference paper (Refereed)
    Abstract [en]

    This paper presents a brief overview of work-in-progress for a study on correlations between visual and haptic spatial attention in a multimodal single-user application comparing different modalities. The aim is to gain insight into how auditory and haptic versus visual representations of temporal events may affect task performance and spatial attention. For this purpose, a 3D application involving one haptic model and two different sound models for interactive sonification are developed.

  • Kiss, Tamás
    University of Gothenburg, Gothenburg, Sweden.
    Predictability in Equity Markets: Estimation and Inference2019Doctoral thesis, monograph (Other academic)
    Abstract [en]

    The thesis consists of three chapters dealing with predictability in equity markets. The first chapter analyses predictive regressions in a predictive system framework, where the predictor is an imperfect proxy for the expected returns. I show that when there are differences between the dynamic structure of the expected return and the predictor, the predictive regression uses predictive information inefficiently. As a solution, I propose a persistence adjustment for the predictive regression. The resulting estimator is a two-stage method, where the expected return and predictor processes are modelled separately, allowing for each to have distinct dynamic properties. Simulations, as well as empirical results, show that the method leads to both better in-sample fit and real-time forecasting performance. In the second chapter we show that the dividend-growth based test of return predictability, proposed by Cochrane [2008, Review of Financial Studies 21, 1533-1575], is similar to a likelihood-based test of the standard return-predictability model, treating the autoregressive parameter of the dividend-price ratio as known. In comparison to standard OLS-based inference, both tests achieve power gains from a strong use of the exact value postulated for the autoregressive parameter. When compared to the likelihood-based test, there are no power advantages for the dividend-growth based test. In common implementations, with the autoregressive parameter set equal to the corresponding OLS estimate, Cochrane's test also suffers from severe size distortions. The third chapter provides an explanation for why predictive regressions may have lost power in recent samples. In a noisy predictor framework, where expected returns are stationary and a non-stationary component masks the information in the regressor, I show that the predictive power of the regression vanishes as the sample size increases. To address vanishing predictability, I propose an estimation method, subsample fixed effects. It involves estimating the predictive relationship locally in subsamples and then pooling the estimates via a fixed effects estimator. Empirically, important predictors of the stock returns exhibit vanishing predictability but applying subsample fixed effects indicates that the underlying predictive relationship between these predictors and returns remains significant.

  • Gustafsson, Anders
    Jönköping International Business School, Jönköping University, Jönköping, Sweden.
    Industrial policy: Political considerations, payoffs, and peculiar incentives2018Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis consists of four independent papers. They deal with some aspects of industrial policy, namely public supports to firms that are intended to support innovation and growth at the firm level, using Swedish data. Two papers study the efficiency of current Swedish policies by estimating the effects of subsidies and public loans to firms, respectively.

    The results on subsidized firms suggests that there are some positive effects on profits and productivity, but these diminish and disappear over time. The results of public loans are more positive with long lasting effects on productivity and sales but only for smaller firms. Public loans do not lead to an increase in the number of employees in the firms that receive them.

    The third paper studies the selection of firms for subsidies and the incentives firms have to seek them. By modeling the decision to seek subsidies as a trade off between producing in the market and seeking grants, the results suggest that firms with low market productivity might self-select into seeking grants. The empirical results are in line with the theoretical predictions.

    The final paper studies the incentives that politicians have to implement programs and policies that they know will be inefficient. Since a lack of political action can make the politicians look incompetent, incumbentens have incentives to implement policies even though they know that these will be ineffective, to signal competence towards the voters.

  • Gustafsson, Anders
    Jönköping International Business School; The Ratio Institute.
    Statens roll för företagsstöd och då särskilt innovationsstöd2015In: Tillväxt genom stöd: En bok om statligt stöd tillnäringslivet / [ed] Gustavsson Tingvall, P., Östersund: Tillväxtanalys , 2015, p. 13-21Chapter in book (Other (popular science, discussion, etc.))
    Abstract [sv]

    Kapitlet diskuter argument för och emot statlig intervention och selektiva stödåtgärder. Under vilka förutsättningar är det motiverat att stötta företag och FoI-verksamhet, och vilka utmaningar möter en sådan politik? Argument för statligt stöd är att staten kan lösa marknadsproblem. Exempelvis kan staten behöva stötta innovativa företag som annars har svårt att få finansiering. Det är ofta svårt för banker och andra finansiärer att bedöma dessa företags lönsamhet, vilket gör dem mindre benägna att låna ut pengar. Riskkapitalbolag kan ta större risker, men stödjer sällan nya företag eftersom det blir för dyrt att utvärdera om de är värda att satsa på. Ett annat argument är att ny kunskap har positiva effekter på andra än de företag som får stöd. Därför bör staten stötta innovativa företag och projekt som ännu inte är lönsamma nog för marknaden. Dessutom kan staten ta en aktiv roll för att samordna och effektivisera innovationssystemet och samverkan mellan stat, näringsliv, akademi och finansiärer. Argument emot statligt stöd är att företag ägnar sig åt att söka stöd i stället för åt produktivt arbete. Stödet kan också gå till företag som är bra på att söka stöd och ägnar sig åt ”rätt” saker, snarare än de företag som bäst behöver det. Ett annat motargument är att det kan vara svårt att motivera varför staten skulle vara bättre på att hitta lönsamma företag än marknaden. Statliga selektiva stöd kan också leda till att ett mindre produktivt företag konkurrerar ut ett som är mer produktivt. Andra utmaningar som stödpolitiken har att brottas med är bland annat att det kan vara dyrt att administrera stöden, att stöden inte generar nya investeringar utan bara ses som en alternativ finansiering till en åtgärd som skulle gjorts i alla fall och att de kan hindra nödvändig strukturomvandling. Men statligt stöd kan också handla om att stötta företag i utsatta regioner och sektorer. Här handlar det om medmänsklighet och valfrihet för medborgarna. Vi menar dock att även om stöden är av denna karaktär bör de användas så effektivt som möjligt.

  • Gustafsson, Anders
    Internationella Handelshögskolan i Jönköping, Jönköping, Sverige; Ratio, stockholm, Sverige.
    Den borgerliga kulturen skapade den industriella revolutionen2017In: Ekonomisk Debatt, ISSN 0345-2646, Vol. 45, no 5, p. 83-85Article, book review (Other (popular science, discussion, etc.))
  • Bergh, Andreas
    et al.
    Lund University, Lund, Sweden.
    Erlingsson, Gissur Ó.
    CKS, Linköping University, Linköping, Sweden.
    Gustafsson, Anders
    Jönköping Business School, Jönköping, Sweden; The Ratio Institute, Stockholm, Sweden.
    Wittberg, Emanuel
    IAS, Linköping University, Linköping, Sweden.
    Municipally Owned Enterprises as Danger Zones for Corruption?: How Politicians Having Feet in Two Camps May Undermine Conditions for Accountabilit2019In: Public Integrity, ISSN 1099-9922, E-ISSN 1558-0989, Vol. 21, no 3, p. 320-352Article in journal (Refereed)
    Abstract [en]

    The market-inspired reforms of New Public Management have been particularly pronounced in Swedish local government. Notably, municipally owned enterprises (MOEs) have rapidly grown in numbers. Principal-agent theory gives rise to the hypothesis that the massive introduction of MOEs has impacted negatively on the conditions for accountability in Swedish local government. To study this, social network analysis was employed in mapping networks for 223 MOEs in 11 strategically chosen municipalities, covering a total of 732 politicians. The analysis reveals substantial overlaps between principals (representatives of the ultimate stakeholders, citizens) and agents (the boards of the MOEs). Hence, corporatization of public services seems to imply worrisome entanglements between the politicians who are set to steer, govern, and oversee MOEs on the one hand, and the board members of MOEs on the other. The increasing numbers of MOEs may therefore have adverse effects on accountability in important and growing parts of Swedish local government.

  • Grylin, Hanna
    Örebro University, School of Law, Psychology and Social Work.
    Passivitetsrätten vid skattetillägg2019Doctoral thesis, monograph (Other academic)
    Abstract [en]

    When a taxpayer fails to fulfill the obligation in Chapter 30 Section 1 and Chapter 31 Section 3 of the Swedish Tax Procedure Act, skatteförfarandelagen (2011:1244), the STPA, to submit information about his or her taxable income, he or she becomes liable to pay a tax surcharge. Decisions about tax surcharges can be made in both administrative and criminal proceedings. In fact, decisions on tax surcharges may be made due to a taxpayer’s passiveness during a criminal tax procedure, regardless of the intent. However, the European Court on Human Rights has established that a person’s silence is not, in itself, sufficient proof for a conviction. This causes a tension between the obligation to submit information about taxable income and the right to silence and the right against self-incrimination in the Swedish tax surcharge procedure.

    The purpose of this thesis is to analyze the relationship between the Swedish system of tax surcharge and the right to silence and the right against self-incrimination according to the ECHR, the EU Charter, Article 3 Section 1 (e) of Directive 2012/13/EU and Article 7 of Directive 2016/343/EU. The method used to analyze these problems and discuss solutions combines a legal dogmatic method with an autonomous interpretation of the right to silence and the right against self-incrimination. The analysis shows that problems occur after the point where a taxpayer has been charged with a criminal offence according to the autonomous meaning of the concept. This point in time corresponds to the point in time when action is taken by the Swedish Tax Agency that has a substantial impact on the taxpayer. The analysis also shows that if a tax surcharge is levied only because of a taxpayer’s silence, after that point, there has been a violation of the right to silence and the right against self-incrimination according to the autonomous meaning.

    The conclusion of the thesis is that there is a need for an amendment to the STPA, which reinforces the autonomous meaning of the right to silence and the right against self-incrimination in the Swedish tax surcharge procedure. This includes new rules in the STPA, which define 1) a duty for the Swedish Tax Agency to inform taxpayers about the right to silence and the right against selfincrimination, 2) the scope of the taxpayer’s obligation to submit information about taxable income in relation to the right to silence and the right against selfincrimination and 3) rules on exemption from tax surcharge when it violates the right to silence and the right against self-incrimination.

  • Spinelli, L.
    et al.
    Consiglio Nazionale delle Ricerche–Istituto di Fotonica e Nanotecnologie, Milano, Italy.
    Botwicz, M.
    IBIB, Nalecz Instutute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland.
    Zolek, N.
    IBIB, Nalecz Instutute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland.
    Kacprzak, M.
    IBIB, Nalecz Instutute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland.
    Milej, D.
    IBIB, Nalecz Instutute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland.
    Sawosz, P.
    IBIB, Nalecz Instutute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland.
    Liebert, A.
    IBIB, Nalecz Instutute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland.
    Weigel, U.
    ICFO, Institut de Ciències Fotòniques, Parc Mediterrani de la Tecnologia, Castelldefels, Spain.
    Durduran, T.
    ICFO, Institut de Ciències Fotòniques, Parc Mediterrani de la Tecnologia, Castelldefels, Spain.
    Foschum, F.
    ILM, Institut für Lasertechnologien in der Medizin und Messtechnik an der Universität Ulm, Germany.
    Kienle, A.
    ILM, Institut für Lasertechnologien in der Medizin und Messtechnik an der Universität Ulm, Germany.
    Baribeau, F.
    INO, National Optics Institute, Québec, Canada.
    Leclair, S.
    INO, National Optics Institute, Québec, Canada.
    Bouchard, J. -P
    INO, National Optics Institute, Québec, Canada.
    Noiseux, I.
    INO, National Optics Institute, Québec, Canada.
    Gallant, P.
    INO, National Optics Institute, Québec, Canada.
    Mermut, O.
    INO, National Optics Institute, Québec, Canada.
    Farina, A.
    Consiglio Nazionale delle Ricerche–Istituto di Fotonica e Nanotecnologie, Milano, Italy.
    Pifferi, A.
    Consiglio Nazionale delle Ricerche–Istituto di Fotonica e Nanotecnologie, Milano, Italy; POLIMI, Politecnico di Milano–Dipartimento di Fisica, Milano, Italy.
    Torricelli, A.
    POLIMI, Politecnico di Milano–Dipartimento di Fisica, Milano, Italy.
    Cubeddu, R.
    Consiglio Nazionale delle Ricerche–Istituto di Fotonica e Nanotecnologie, Milano, Italy; POLIMI, Politecnico di Milano–Dipartimento di Fisica, Milano, Italy.
    Ho, H. -C
    ITRI, Industrial Technology Research Institute, Hsinchu, Taiwan; PTB, Physikalisch-Technische Bundesanstalt, Braunschweig und Berlin, Germany.
    Mazurenka, M.
    PTB, Physikalisch-Technische Bundesanstalt, Braunschweig und Berlin, Germany.
    Wabnitz, H.
    PTB, Physikalisch-Technische Bundesanstalt, Braunschweig und Berlin, Germany.
    Klauenberg, K.
    PTB, Physikalisch-Technische Bundesanstalt, Braunschweig und Berlin, Germany.
    Bodnar, Olha
    PTB, Physikalisch-Technische Bundesanstalt, Braunschweig und Berlin, Germany.
    Elster, C.
    PTB, Physikalisch-Technische Bundesanstalt, Braunschweig und Berlin, Germany.
    Bénazech-Lavoué, M.
    TomOptUS, Département de génieélectrique, Université de Sherbrooke, Canada.
    Bérubé-Lauzière, Y.
    TomOptUS, Département de génieélectrique, Université de Sherbrooke, Canada.
    Lesage, F.
    Département de génieélectrique, École Polytechnique de Montréal, Canada.
    Khoptyar, D.
    ULUND, Department of Physics, Lund University, Sweden.
    Subash, A. A.
    ULUND, Department of Physics, Lund University, Sweden.
    Andersson-Engels, S.
    ULUND, Department of Physics, Lund University, Sweden.
    Di Ninni, P.
    UNIFI, Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, Italy.
    Martelli, F.
    UNIFI, Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, Italy.
    Zaccanti, G.
    UNIFI, Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, Italy.
    Determination of reference values for optical properties of liquid phantoms based on Intralipid and India ink2014In: Biomedical Optics Express, ISSN 2156-7085, E-ISSN 2156-7085, Vol. 5, no 7, p. 2037-2053Article in journal (Refereed)
    Abstract [en]

    A multi-center study has been set up to accurately characterize the optical properties of diffusive liquid phantoms based on Intralipid and India ink at near-infrared (NIR) wavelengths. Nine research laboratories from six countries adopting different measurement techniques, instrumental set-ups, and data analysis methods determined at their best the optical properties and relative uncertainties of diffusive dilutions prepared with common samples of the two compounds. By exploiting a suitable statistical model, comprehensive reference values at three NIR wavelengths for the intrinsic absorption coefficient of India ink and the intrinsic reduced scattering coefficient of Intralipid-20% were determined with an uncertainty of about 2% or better, depending on the wavelength considered, and 1%, respectively. Even if in this study we focused on particular batches of India ink and Intralipid, the reference values determined here represent a solid and useful starting point for preparing diffusive liquid phantoms with accurately defined optical properties. Furthermore, due to the ready availability, low cost, long-term stability and batch-to-batch reproducibility of these compounds, they provide a unique fundamental tool for the calibration and performance assessment of diffuse optical spectroscopy instrumentation intended to be used in laboratory or clinical environment. Finally, the collaborative work presented here demonstrates that the accuracy level attained in this work for optical properties of diffusive phantoms is reliable.

  • Fan, Isaac
    et al.
    Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany.
    Knappe-Grüneberg, Silvia
    Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany.
    Voigt, Jens
    Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany.
    Kilian, Wolfgang
    Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany.
    Burghoff, Martin
    Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany.
    Stollfuss, Detlef
    Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany.
    Schnabel, Allard
    Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany.
    Wübbeler, Gerd
    Physikalisch-Technische Bundesanstalt (PTB)Berlin, Germany.
    Bodnar, Olha
    Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany.
    Elster, Clemens
    Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany.
    Seifert, Frank
    Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany.
    Trahms, Lutz
    Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany.
    Direct measurement of the γHe / γXe ratio at ultralow magnetic field2016In: 8TH SYMPOSIUM ON FREQUENCY STANDARDS AND METROLOGY 2015 / [ed] Riehle, F., IOP Publishing Ltd , 2016, Vol. 723, p. 1-7, article id 012045Conference paper (Refereed)
    Abstract [en]

    A co-located 3He and 129Xe nuclear spin free precession measurement at sub-μT magnetic field was carried out in a magnetically shielded environment. The uncorrected quotient of the gyromagnetic ratios between neutral 3He and 129Xe atoms is determined to be 2.754 082 81(07), accounting for only statistical error. Our measurement shows that this ratio has a stability of 1.4×10-5/ √τ, demonstrating the ability to reach the current precision limit of the quotient in a 10000 s of averaging time τ. This precision is enough for the next-generation EDM search in neutral 129Xe atoms based on a similar comagnetometer scheme.

  • Bodnar, Olha
    et al.
    Physikalisch-Technische Bundesanstalt, Berlin, Gremany.
    Link, Alfred
    Physikalisch-Technische Bundesanstalt, Berlin, Germany.
    Elster, Clemens
    Physikalisch-Technische Bundesanstalt, Berlin, Germany.
    Objective Bayesian Inference for a Generalized Marginal Random Effects Model2016In: Bayesian Analysis, ISSN 1936-0975, E-ISSN 1931-6690, Vol. 11, no 1, p. 25-45Article in journal (Refereed)
    Abstract [en]

    An objective Bayesian inference is proposed for the generalized marginal random effects model p(x|μ, σλ) = f((x − μ1) T (V + σ2 λI) −1 (x − μ1))/ det(V + σ2 λI). The matrix V is assumed to be known, and the goal is to infer μ given the observations x = (x1,...,xn) T , while σλ is a nuisance parameter. In metrology this model has been applied for the adjustment of inconsistent data x1,...,xn, where the matrix V contains the uncertainties quoted for x1,...,xn. √ We show that the reference prior for grouping {μ, σλ} is given by π(μ, σλ) ∝ F22, where F22 denotes the lower right element of the Fisher information matrix F. We give an explicit expression for the reference prior, and we also prove propriety of the resulting posterior as well as the existence of mean and variance of the marginal posterior for μ. Under the additional assumption of normality, we relate the resulting reference analysis to that known for the conventional balanced random effects model in the asymptotic case when the number of repeated within-class observations for that model tends to infinity. We investigate the frequentist properties of the proposed inference for the generalized marginal random effects model through simulations, and we also study its robustness when the underlying distributional assumptions are violated. Finally, we apply the model to the adjustment of current measurements of the Planck constant.

  • Larsson, Karl
    Department of Economics, Knut Wicksell Centre for Financial Studies, School of Economics and Management, Lund University, Lund, Sweden.
    Reserve Lifetime and Depletion in Exhaustible Resource Extraction Under Uncertainty2014Report (Other (popular science, discussion, etc.))
    Abstract [en]

    This paper studies the implications for reserve lifetime and related quantities in a continuous time model of resource extraction under uncertainty. Both the resource price and the extracted amount are assumed to follow stochastic processes. Reserve lifetime is determined by the profit-maximizing firms optimal decision of when to close down production. We derive closed form expressions for the expected value and the probability distribution of reserve lifetime, the expected level of depletion, and the expected streams of discounted revenues and costs until closing.

  • Larsson, Karl
    Department of Economics, Knut Wicksell Centre for Financial Studies School of Economics and Management, Lund University, Lund Sweden.
    An Equilibrium Model for Commodity Prices with Regime Switching Reserve Dynamics2014Report (Other (popular science, discussion, etc.))
    Abstract [en]

    We explore the implications for asset prices and implied volatilities in an equilibrium model of commodity production. Production of the commodity can be carried out in one of two regimes. In the first regime the reserves are set in constant decline while in the second regime new additions to the reserve base are made. The optimal production rule is to switch regime when the stochastic revenue process of the producer hits certain barrier values. As a consequence of the optimal production rule equilibrium spot prices also become regime switching. The shapes of forward curves and implied volatilities are strongly dependent on the level of the stochastic revenue process.

  • Andersson, Fredrik
    et al.
    Research Institute of Industrial Economics (IFN), stockholm, Sweden; Department of Economics, Lund University, Lund, Sweden.
    Jordahl, Henrik
    Örebro University, Örebro University School of Business. Research Institute of Industrial Economics (IFN), Stockholm, Sweden; CESifo, Munich, Germany; IZA, Bonn, Germany.
    Josephson, Jens
    Research Institute of Industrial Economics (IFN), Stockholm, Sweden; Stockholm Business School, Stockholm University, Stockholm, Sweden.
    Outsourcing Public Services: Contractibility, Cost, and Quality2019In: CESifo Economic Studies, ISSN 1610-241X, E-ISSN 1612-7501, p. 1-24Article in journal (Refereed)
    Abstract [en]

    We review the literature on public sector outsourcing to explore if the theoretical predictions from the incomplete contracts literature hold up to recent empirical evidence. Guided by theory, we arrange services according to the type and magnitude of their contractibility problems. The empirical studies point at rather favourable outsourcing outcomes, in terms of costs and quality, for services without severe contracting problems. The picture is more mixed for services with tougher contracting problems, with the weight of the evidence in favour of public provision. This difference between services is largely in line with the property-rights framework and theories of incomplete contracts.

  • Jordahl, Henrik
    Institutet för Näringslivsforskning (IFN), Stockholm, Sverige.
    Granskning av ESO-rapporten Dags för omprövning av Per Molander2017Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    ESO-rapporten Dags för omprövning av Per Molander behandlar privatiseringar av välfärdstjänster och näringslivsinspirerade styrmetoder inom offentlig verksamhet. Tyvärr lider ESO-rapporten av flera brister som är så allvarliga att den inte bör ligga till grund för politiskt beslutsfattande. Detta Policy Paper redogör för åtta sådana allvarliga brister.

  • Jordahl, Henrik
    Institutet för Näringslivsforskning, IFN), Stockholm, Sweden.
    Cherry picking i välfärdsföretag2018In: I stället för vinstförbud: Bättre reglering av välfärdsföretag, Fores , 2018, p. 22-25Chapter in book (Other (popular science, discussion, etc.))
  • Jordahl, Henrik
    et al.
    London School of Economics, London, UK; Institutet för Näringslivsforskning (IFN), Stockholm, Sverige.
    Heller Sahlgren, Gabriel
    Institutet för Näringslivsforskning (iFN), Stockholm, Sverige.
    Lönsamma kunskaper: Sambandet mellan vinst och kvalitet i svenska grundskolor2018Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    I den här rapporten undersöker forskarna Gabriel Heller-Sahlgren, London School of Economics och Institutet för Näringslivsforskning, och Henrik Jordahl, Institutet för Näringslivsforskning, sambandet mellan skolors lönsamhet och utbildningskvalitet. Analysen är gjord på aktiebolag, som är den dominerande organisationsformen för friskolor. Resultaten tyder på att lönsamhet och kvalitet går hand i hand på svenska grundskolor. Det gäller både akademiska kvalitetsmått som baseras på elevernas studieresultat och mjukare mått som baseras på elevernas attityder. För att undersöka om sambanden kan bero på betygsinflation jämförs elevernas slutbetyg med deras betyg på nationella prov. Härvid framkommer ingenting som tyder på att sambandet mellan friskolornas lönsamhet och deras elevers studieresultat skulle bero på betygsinflation. Författarna finner heller inget stöd för att lönsamma friskolor har en mer fördelaktig elevsammansättning. Tvärt emot sådana farhågor verkar elevsammansättningen nästan inte skilja sig alls mellan friskolor med olika lönsamhetsnivåer. Enligt författarna förefaller alltså hög utbildningskvalitet vara lönsam för skolföretagen, precis som kan förväntas på andra marknader.

  • Heller-Sahlgren, Gabriel
    et al.
    London School of Economics, London, UK; Institutet för Näringslivsforskning (IFN), Stockholm, Sverige.
    Jordahl, Henrik
    Örebro University, Örebro University School of Business. Institutet för Näringslivsforskning ((IFN), Stockholm, Sweden.
    En kunskapsskola för tillväxt2019Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    Skolan har länge uppmärksammats i svensk debatt. En växande andel elever går ut grundskolan utan godkänt i kärnämnen och resultaten har över tid varit fallande i internationella kunskapsmätningar (även om den senaste PISA-mätningen visade på en en förbättring). Utöver att en bra utbildning är viktig för den enskilde vet vi att humankapital är viktigt för tillväxten i ett land. En bra fungerande grundutbildning är också en förutsättning för en fungerande kompetensförsörjning.Rapporten går igenom modern forskning om vilken effekt humankapital, mätt med kunskapsresultat i internationella mätningar, har på tillväxt. Det visar sig att resultaten i internationella kunskapsmätningar har mycket stor betydelse för länders tillväxt.Studien går sedan också igenom vilka faktorer som i sin tur påverkar resultaten i internationella kunskapsmätningar.

  • Jordahl, Henrik
    Institutet för Näringslivsforskning, IFN, Stockholm, Sverige.
    Vad kännetecknar vår tid?2015In: Ekonomisk Debatt, ISSN 0345-2646, Vol. 43, no 4, p. 91-92Article, book review (Other (popular science, discussion, etc.))
  • Jordahl, Henrik
    Institutet för Näringslivsforskning (IFN), Stockholm, Sverige.
    Nyttig introduktion till mänsklighetens främsta ekonomiska fråga2016In: Ekonomisk Debatt, ISSN 0345-2646, Vol. 44, no 3, p. 66-67Article, book review (Other academic)
  • Jordahl, Henrik
    et al.
    Institutet för Näringslivsforskning (IFN), Stockholm, Sverige.
    Sundén, David
    Lakeville Economic Cunsulting, Sverige.
    Vinstbegränsning i välfärden2016Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    Vilka är de samhällsekonomiska konsekvenserna av att begränsa välfärdsföretagens vinster? Svenskt Näringsliv har gett docent Henrik Jordahl och ek. doktor David Sundén i uppdrag att söka besvara denna fråga.

    I rapporten granskas först de motiv som regeringen angett för Välfärdsutredningens uppdrag att föreslå vinstregleringar för företagen inom välfärdssektorn. Regeringen har angett tre huvudmotiv. - vinstutdelning innebär ett betydande läckage av skattemedel, - välfärdsföretagen gör mycket höga vinster, - vinstsyfte hämmar kvaliteten hos vinstdrivande företag. En slutsats i rapporten är att det så kallade läckaget av skattemedel är försumbart. En vinstreglering kan återföra resurser som högt räknat motsvarar 6 promille av de totala kostnaderna för välfärden, vilket inte kan ha någon betydande påverkan på de tjänster som kommer brukarna till del.

    En ytterligare slutsats är att företagen inte gör några övervinster. I rapporten anges att rörelsemarginalen är ett lämpligt mått på detta eftersom det anger välfärdsföretagens överskott i förhållande till vad de tilldelas i skattemedel, det vill säga det mäter hur mycket som kan tänkas läcka ut ur välfärden. Den genomsnittliga rörelsemarginalen ligger på cirka 6 procent, vilket är i paritet med jämförbara branscher. I rapporten görs också bedömningen att företagens vinst inte går ut över tjänsternas kvalitet. Det finns inga empiriska belägg för att så skulle ske på ett systematiskt sätt. I rapporten visas också att de mest lönsamma företagen inom äldreomsorgen levererar minst lika hög kvalitet som mindre lönsamma företag.

    Välfärdsutredningens utgångspunkter avfärdas därför som falska. I rapporten görs också en bedömning av de samhällsekonomiska effekterna av en vinstreglering. En trolig följd av en vinstreglering är att företagens kostnader av engångskaraktär kan bedömas öka. En annan konsekvens är att kostnadseffektiviteten minskar. Dessutom kan investeringar och nyföretagande bedömas minska genom ett politiskt satt vinsttak.

    Mot bakgrund av att antalet äldre som ska dela på de offentliga välfärdsresurserna blir allt fler är det enligt rapporten angeläget att öka produktiviteten i välfärdssektorn. Försämrade drivkrafter för nyföretagande, investeringar, produktivitet och kostnadseffektivitet är därmed fel väg att gå.

  • Jordahl, Henrik
    Institutet för Näringslivsforskning (IFN), Stockholm, Sverige.
    Vad jag skrev2017In: Ekonomisk Debatt, ISSN 0345-2646, Vol. 45, no 6, p. 63-67Article in journal (Other (popular science, discussion, etc.))
  • Jordahl, Henrik
    Institutet för Näringslivsforskning (IFN), Stockholm, Sverige.
    Bred analys av tjänstesektorn med Sverige i fokus2015In: Ekonomisk Debatt, ISSN 0345-2646, Vol. 43, no 3, p. 95-96Article, book review (Other academic)
  • Jordahl, Henrik
    Research Institute of Industrial Economics (IFN).
    Promise voters to pad their wallets, and they will listen2015In: News from IFN, no 2Article in journal (Other (popular science, discussion, etc.))
  • Jordahl, Henrik
    Institutet för Näringslivsforskning (IFN), stockholm, Sweden.
    En effektivare skola ger mer kunskap2016Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    Den svenska skolan behöver ett effektivt kvalitetsarbete. Pisa-resultaten talar sitt tydliga språk, och det är högst angeläget att vidta åtgärder som kan förbättra skolresultaten. Rapporten fokuserar på skolors systematiska kvalitetsarbete och effektiviseringsarbete och hur dessa påverkar elevernas prestationer.

  • Jordahl, Henrik
    IFN - Institutet för Näringslivsforskning, Stockholm, Sverige.
    Omprövning av en djärv ESO-rapport2017In: Ekonomisk Debatt, ISSN 0345-2646, Vol. 45, no 5, p. 6p. 68-73Article in journal (Other (popular science, discussion, etc.))
  • Bergman, Mats A.
    et al.
    Södertörns högskola, Huddinge, Sveirge.
    Jordahl, Henrik
    Institutet för Näringslivsforskning (IFN), Sverige.
    Goda år på ålderns höst?: En ESO-rapport om konkurrens i äldreomsorgen2014Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    Under de senaste decennierna har det blivit möjligt att driva äldreomsorg i privat regi. Förespråkarna för denna utveckling pekar på valfrihet och ökad effektivitet. Kritikerna talar om vanvård och menar att äldreomsorg inte lämpar sig för marknadslösningar. I rapporten analyserar forskarna förutsättningarna för att nå god kvalitet och effektivt resursutnyttjande vid marknadsliknande lösningar i äldreomsorgen. De frågor som diskuteras i rapporten är bl.a.:

    • Hur fungerar den svenska äldreomsorgsmarknaden?
    • Under vilka förutsättningar kan valfrihet och konkurrens förbättra omsorgen?
    • Vilka krav kan och bör ställas på äldreomsorgens utförare?
    • Vilken betydelse har brukarval för omsorgens kvalitet?
  • Jordahl, Henrik
    et al.
    Research Institute of Industrial Economics (IFN), Stockholm, Sweden.
    Persson, Lovisa
    Research Institute of Industrial Economics (IFN), Stockholm, Sweden.
    Exploring Digital Time Measurement in the Public Sector: Labor Productivity and Service Quality in Home Care2018Report (Other academic)
    Abstract [en]

    We measure labor productivity in home care using new data from the recent introduction of digital time measurement in Swedish municipalities. By measuring worker utilization (delivered hours as a share of worked hours) we avoid several problems that have plagued previous studies of public sector productivity. The time use measure exposes substantial variation in productivity between home care units, suggesting room for improvement. More productive units deliver a larger share of the hours approved by care managers and have equally satisfied users.

  • Berggren, Niclas
    et al.
    Research Institute of Industrial Economics (IFN), Stockholm, Sweden; Department of Institutional, Experimental and Environmental Economics (KIE), University of Economics in Prague, Prague, the Czech Republic.
    Jordahl, Henrik
    Research Institute of Industrial Economics (IFN), Stockholm, Sweden; IZA, Bonn, Germany.
    Poutvaara, Panu
    University of Munich, Munich, Germany; Ifo Institute, Germany; CESifo, Munich, Germany; CReAM, London, UK; IZA, BOnn, Germany.
    The Right Look: Conservative Politicians Look Better and Voters Reward It2015Report (Other (popular science, discussion, etc.))
    Abstract [en]

    Since good-looking politicians win more votes, a beauty advantage for politicians on the left or on the right is bound to have political consequences. We show that politicians on the right look more beautiful in Europe, the United States and Australia. Our explanation is that beautiful people earn more, which makes them less inclined to support redistribution. Accordingly, our model predicts that voters use beauty as a cue for conservatism when they do not know much about candidates and that politicians on the right benefit more from beauty in low-information elections. Evidence from real and experimental elections confirms both predictions.

  • Andersson, Fredrik
    et al.
    Lund University, Lund, Sweden; IFN, Stockholm, Sweden.
    Jordahl, Henrik
    Örebro University, Örebro University School of Business. IFN, Stockholm, Sweden; Cesifo, Munich, Germany; IZA, Bonn, Germany.
    Josephson, Jens
    IFN, Stockholm, Sweden; Stockholm Business School, Stockholm University, Stockholm, Sweden.
    Outsourcing Public Services: Contractibility, Cost, and Quality2019Report (Other academic)
    Abstract [en]

    We review the literature on public sector outsourcing to explore if the theoretical predictions from the incomplete contracts literature hold up to recent empirical evidence. Guided by theory, we arrange services according to the type and magnitude of their contractibility problems. The empirical studies point at rather favourable outsourcing outcomes, in terms of costs and quality, for services without severe contracting problems. The picture is more mixed for services with tougher contracting problems, with the weight of the evidence in favour of public provision. This difference between services is largely in line with the property-rights framework and theories of incomplete contracts.

  • Andersson, Fredrik
    et al.
    Department of Economics, Lund University, Lund, Sweden; Research Institute of Industrial Economics (IFN), Stockholm, Sweden.
    Jordahl, Henrik
    Örebro University, Örebro University School of Business. Research Institute of Industrial Economics (IFN), Stockholm, Sweden, CESifo, Stockholm, Sweden, IZA, Bonn, Germany.
    Josephson, Jens
    Research Institute of Industrial Economics (IFN), Stockholm, Sweden; Stockholm Business School, Stockholm University, Stockholm, Sweden.
    Outsourcing Public Services: Contractibility, Cost, and Quality2019Report (Other academic)
    Abstract [en]

    We review the literature on public sector outsourcing to explore if the theoretical predictions from the incomplete contracts literature hold up to recent empirical evidence. Guided by theory, we arrange services according to the type and magnitude of their contractibility problems. The empirical studies point at rather favourable outsourcing outcomes, in terms of costs and quality, for services without severe contracting problems. The picture is more mixed for services with tougher contracting problems, with the weight of the evidence in favour of public provision. This difference between services is largely in line with the property-rights framework and theories of incomplete contracts.

  • Bergman, Mats A.
    et al.
    Södertörn University, Huddinge, Sweden.
    Jordahl, Henrik
    Research Institute of Industrial Economics (IFN), stockholm, Sweden.
    Lundberg, Sofia
    Umeå School of Business, Economics and Statistics (USBE), Umeå University, Umeå, Sweden.
    Choice and Competition in the Welfare State: Home Care as the Ideal Quasi-market2018Report (Other (popular science, discussion, etc.))
    Abstract [en]

    We study a reform by which a standardized model of choice and competition was introduced in tax-financed home care in a majority of Swedish municipalities. The market for home care is of particular interest since it is close to the ideal quasi-market. For identification, we exploit the different timing of reform implementation across municipalities. We find that the introduction of free choice and free entry in home care increased perceived quality by about one quarter of a standard deviation without affecting costs. Since satisfaction is unrelated to the private market share, the underlying mechanism seems to be new choice opportunities rather than competition or an advantage of private providers.

  • Angelis, Jannis
    et al.
    Royal Institute of Technology, Stockholm, Sweden; Research Institute of Industrial Economics (IFN), Stockholm, Sweden.
    Häger Glenngård, Anna
    Lund University School of Economics and Management, Lund, Sweden; Research Institute of Industrial Economics (IFN), Stockholm, Sweden.
    Jordahl, Henrik
    Research Institute of Industrial Economics (IFN), Stockholm, Sweden; CESifo (Center for Economic Studies and Ifo Institute), Munich, Germany; IZA, Bonn, Germany.
    Management Practices and the Quality of Primary Care2017Report (Other academic)
    Abstract [en]

    Using the World Management Survey method, we map and analyse management quality in Swedish primary care centres. On average, private providers have higher management quality than public ones. We also find that centres with a high overall social deprivation among enrolled patients tend to have higher management quality. Regarding quality of care, we find that management quality is positively associated with accessibility, but not with patient reported experience.

  • Hogarth, Claire Milne
    Örebro University, School of Humanities, Education and Social Sciences.
    Theme Introduction2019In: Utbildning och Demokrati, ISSN 1102-6472, E-ISSN 2001-7316, Vol. 28, no 2, p. 5-15Article in journal (Other academic)
  • Hogarth, Claire Milne
    Örebro University, School of Humanities, Education and Social Sciences.
    Summary of the Round-Table Discussion2019In: Utbildning och Demokrati, ISSN 1102-6472, E-ISSN 2001-7316, Vol. 28, no 2, p. 125-128Article in journal (Other academic)
  • de Asis Fernandez, Fran
    et al.
    Departament of Health, Centro Superior de Estudios Universitarios La Salle, Universidad Autónoma de Madrid, Madrid, Spain; Department of Health Sciences, Mid Sweden University, Östersund, Sweden.
    Rodríguez-Zamora, Lara
    Örebro University, School of Health Sciences. Department of Health Sciences, Mid Sweden University, Östersund, Sweden.
    Schagatay, Erika
    Department of Health Sciences, Mid Sweden University, Östersund, Sweden.
    Hook Breathing Facilitates SaO(2) Recovery After Deep Dives in Freedivers With Slow Recovery2019In: Frontiers in Physiology, ISSN 1664-042X, E-ISSN 1664-042X, Vol. 10, article id 1076Article in journal (Refereed)
    Abstract [en]

    (SaO2)To facilitate recovery from hypoxia, many freedivers use a breathing method called "hook breathing" (HB) after diving, involving an interrupted exhale to build up intrapulmonary pressure. Some divers experience a delay in recovery of arterial oxygen saturation (SaO2) after diving, interpreted as symptoms of mild pulmonary edema, and facilitated recovery may be especially important in this group to avoid hypoxic "blackout." We examined the influence of HB on recovery of (SaO2) in freedivers with slow recovery (SR) and fast recovery (FR) of (SaO2) after deep "free immersion" (FIM) apnea dives to 30 m depth. Twenty-two male freedivers, with a mean (SD) personal best in the discipline FIM of 57(26) m, performed two 30 m deep dives, one followed by HB and one using normal breathing (NB) during recovery, at different days and weighted order. (SaO2) and heart rate (HR) were measured via pulse oximetry during recovery. The SR group (n = 5) had a faster (SaO2) recovery using HB, while the FR group (n = 17) showed no difference between breathing techniques. At 105 s, the SR group reached a mean (SD) SaO(2) of 95(5)% using HB, while using NB, their (SaO2) was 87(5)% (p < 0.05), and 105-120 s after surfacing(SaO2) was higher with HB (p < 0.05). In SR subjects, the average time needed to reach 95% (SaO2) with HB was 60 s, while it was 120 s at NB (p < 0.05). HR was similar in the SR group, while it was initially elevated at HB in the FR group (p < 0.05). We conclude that HB efficiently increases (SaO2) recovery in SR individuals, but not in the FR group. The proposed mechanism is that increased pulmonary pressure with HB will reverse any pulmonary edema and facilitate oxygen uptake in divers with delayed recovery.

  • Nerhagen, Lena
    et al.
    Statens väg- och transportforskningsinstitut, Transportekonomi, TEK, Linköping, Sverige.
    Fors, Heather Congdon
    Göteborgs universitet, Göteborg, Sverige.
    Hansson, Lisa
    Högskolen i Molde, Norge.
    Jussila Hammes, Johanna
    Konjunkturinstitutet, Stockholm, Sverige.
    Pyddoke, Roger
    Statens väg- och transportforskningsinstitut, Transportekonomi, TEK, Linköping, Sverige.
    Politiska krav och tjänstemäns roll för analys av och beslut om styrmedel: Sammanfattande slutrapport2018Report (Other academic)
    Abstract [en]

    Sustainable development implies that society’s limited resources should be used efficiently, taking into account the various impacts on society – social, economic and environmental. To achieve established societal goals efficiently, various aspects have to be accounted for in the design of policy measures. Within the EU a Regulatory Impact Assessment, where a cost-benefit analysis is included, needs to accompany all major regulatory initiatives. According to research and different policy assessment, Sweden lacks an established praxis regarding this type of analysis in the area of environmental policy but also in the field of energy and transport. The purpose of this project is to investigate how Sweden uses this type of information in the negotiations that take place within the EU regarding policy proposals but also investigate the reasons for use or non-use. The focus is on what role the organization and the bureaucrats play for the collection of this type of information.

    The overall conclusion that can be drawn from the three sub-studies included in the project, as well as the discussion at the closing seminar, is that this is not an established way of working in the Swedish government system. This can be explained by lack of competence, an established mistrust, management by objectives and lack of an institutional framework for when and how this type of broader impact assessment is to be conducted. At the closing seminar, the Swedish Environmental Protection Agency presented that it is now working on a guide to help officials to analyze at an early stage whether there is a need for regulation by society, to initiate the work by asking the question “What is the problem?”. We think that this is a step in the right direction, but we also see that the economists working out in government are often alone or very few and may therefore need different forms of support to develop the work on this kind of, often complex, analysis.

  • Tran, Pham Tue Hung
    et al.
    Örebro University, School of Medical Sciences.
    Asghar, Naveed
    Örebro University, School of Medical Sciences.
    Karlsson, Roger
    Department ofClinical Microbiology, Sahlgrenska University Hospital, Gothenburg, Sweden; NanoxisConsulting AB, Gothenburg, Sweden.
    Karlsson, Anders
    Department ofClinical Microbiology, Sahlgrenska University Hospital, Gothenburg, Sweden; NanoxisConsulting AB, Gothenburg, Sweden.
    Johansson, Magnus
    Örebro University, School of Medical Sciences.
    Melik, Wessam
    Örebro University, School of Medical Sciences.
    Identification and characterization of host proteins inducing the endoplasmic reticulum invagination during Flavivirus infection2019In: Positive-Strand RNA Viuses, 2019, p. 280-280Conference paper (Refereed)
    Abstract [en]

    When Flaviviruses infect host cells, they can induce invagination of endoplasmic reticulum (ER) membrane to form vesicle-like compartments. These unique structures are hypothetical to facilitate the viral replication by reducing diffusion of virus replication machinery and viral RNA, providing a scaffold to anchor the replication complex, and protecting viral RNA from host cell intrinsic surveillance. 

    The rearrangements of ER membrane to form these replication compartments (RCs) require modifications in its lipid constituents or binding of proteins to the membrane. Flaviviruses, indeed, use their proteins to generate RCs. It has been implicated that both KUNV and DENV viral NS1, NS2A, NS4A, NS4B proteins could induce membrane remodelings. However, it is recondite whether host proteins can also participate in the formation and maintenance of RCs.

    In this project, we aimed to identify and characterize of host proteins inducing RC generation during Flavivirus infections. We used A549 as a cell model, and mosquito-borne Zika and Kunjin virus, and tick-borne Langat virus as virus models. After virus infections, ER membranes were harvested using ultracentrifuge with a sucrose gradient. Proteins from these ERs were identified using mass spectrometry. We compared the differences between the ER proteomes of infected cells and non-infected cells to identify host candidate proteins that can cause the RC formation.  We are attempting to enrich the RC-containing fractions and identifying proteins here, which narrows the list of true candidate proteins. The candidate proteins then will be characterized by using molecular techniques such as gene knock down, overexpression, and microscopy techniques.

  • Ojala, Maria
    Örebro University, School of Law, Psychology and Social Work.
    Integrating a sustainability perspective into psychology education: A review of the literature and some suggestions2019Report (Other academic)
    Abstract [en]

    During recent years, the importance of education for dealing with global sustainability problems such as climate change has been emphasized. This report focuses on education for sustainable development (ESD) in higher education. The aim is to discuss, based on research about ESD and a national evaluation of how sustainability issues are included in higher education, how a sustainability perspective can be incorporated in psychology education at the university level. Three questions are in focus: What is sustainable development and how can we best define this complex concept? What is ESD and which are the most important perspectives in the research field of higher education for sustainable development? How can sustainability issues be integrated into courses in psychology and the psychology program?

  • Tran, Pham Tue Hung
    et al.
    Örebro University, School of Medical Sciences.
    Asghar, Naveed
    Örebro University, School of Medical Sciences.
    Karlsson, Roger
    Department ofClinical Microbiology, Sahlgrenska University Hospital, Gothenburg, Sweden; NanoxisConsulting AB, Gothenburg, Sweden.
    Karlsson, Anders
    Department ofClinical Microbiology, Sahlgrenska University Hospital, Gothenburg, Sweden; NanoxisConsulting AB, Gothenburg, Sweden.
    Johansson, Magnus
    Örebro University, School of Medical Sciences.
    Melik, Wessam
    Örebro University, School of Medical Sciences.
    Screening of host proteins interacting with Kunjin, Langat, Zika replication complex2019In: Positive-Strand Rna Viuses, 2019Conference paper (Refereed)
    Abstract [en]

    When Flaviviruses infect host cells, they can induce invagination of endoplasmic reticulum (ER) membrane to form vesicle-like compartments. These unique structures are hypothetical to facilitate the viral replication by reducing diffusion of virus replication machinery and viral RNA, providing a scaffold to anchor the replication complex, and protecting viral RNA from host cell intrinsic surveillance. 

    The rearrangements of ER membrane to form these replication compartments (RCs) require modifications in its lipid constituents or binding of proteins to the membrane. Flaviviruses, indeed, use their proteins to generate RCs. It has been implicated that both KUNV and DENV viral NS1, NS2A, NS4A, NS4B proteins could induce membrane remodelings. However, it is recondite whether host proteins can also participate in the formation and maintenance of RCs.

    In this project, we aimed to identify and characterize of host proteins inducing RC generation during Flavivirus infections. We used A549 as a cell model, and mosquito-borne Zika and Kunjin virus, and tick-borne Langat virus as virus models. After virus infections, ER membranes were harvested using ultracentrifuge with a sucrose gradient. Proteins from these ERs were identified using mass spectrometry. We compared the differences between the ER proteomes of infected cells and non-infected cells to identify host candidate proteins that can cause the RC formation.  We are attempting to enrich the RC-containing fractions and identifying proteins here, which narrows the list of true candidate proteins. The candidate proteins then will be characterized by using molecular techniques such as gene knock down, overexpression, and microscopy techniques.

  • Gustafsson, Karin M
    et al.
    Örebro University, School of Humanities, Education and Social Sciences.
    Löfmarck, Erik
    Örebro University, School of Humanities, Education and Social Sciences.
    Salmonsson, Lisa
    Örebro University, School of Humanities, Education and Social Sciences.
    Uggla, Ylva
    Örebro University, School of Humanities, Education and Social Sciences.
    Skrivutveckling i stora studentgrupper: Erfarenheter från ett pedagogiskt utvecklingsprojekt2019Report (Other academic)
    Abstract [en]

    This report presents the results from a pedagogical project focusing students’ writing in higher education. Literature in this field conclude that student writing should be integrated in teaching of the subject with a plan for progression. Teachers’ and students’ experience indicate that students write a lot during their education, but only occasionally get concrete feedback on the writing as such. Focus groups with students showed that students found it difficult to write distinct and to differentiate between text genres. The teachers reported lack of ”tools” to help the students to improve their writing. The report suggest a model for the work with students writing based on goal setting; inventory; identifying problem areas; prioritizing; implementation; and follow-up and revision.

  • Daunfeldt, Sven-Olov
    et al.
    School of Technology and Business Studies, Economics, Dalarna University, Sweden; HUI Research, Stockholm, Sweden.
    Halvarsson, Daniel
    HUI Research, Stockolm, Sweden.
    Mihaescu, Oana
    School of Technology and Business Studies, Economics, Human Geography, Dalarna University, Sweden; HUI Research, Stockholm, Sweden.
    High-growth firms: Not so vital after all?2015Report (Other academic)
    Abstract [en]

    High-growth firms have received considerable interest recently since they create most of the new jobs in the economy. The purpose of our paper is to investigate the characteristics of high-growth firms prior to their growth period, and whether these characteristics differ across industries. Using data on a large sample of limited liability firms in Sweden for the period 2007-2010, we find that high-growth firms do not have the characteristics that we typically associate with successful firms. On the contrary, our results indicate that high-growth firms have low profits and a weak financial position. This might explain why studies have found that high-growth firms are seldom capable of sustaining their high growth rates in subsequent periods, and thus question policies that are targeted towards these companies.

  • Halvarsson, Daniel
    et al.
    Örebro University, Örebro University School of Business. Ratio Institute, Stockholm, Sweden.
    Korpi, Martin
    Ratio Institute, Stockholm, Sweden.
    Wennberg, Karl
    Institute for Analytical Sociology (IAS), Linköping University, Norrköping, Sweden.
    Entrepreneurship and income inequality2018In: Journal of Economic Behavior and Organization, ISSN 0167-2681, E-ISSN 1879-1751, Vol. 145, p. 275-293Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    Entrepreneurship research highlights entrepreneurship as a simultaneous source of enhanced income mobility for some but a potential source of poverty for others. Research on inequality has furthered new types of models to decompose and problematize various sources of income inequality, but attention to entrepreneurship as an increasingly prevalent occupational choice in these models remains scant. This paper seeks to bridge these two literatures using regression-based income decomposition among entrepreneurs and paid workers distinguishing between self-employed (SE) and incorporated self-employed (ISE) individuals in Sweden. We find that the proportion of self-employed in the workforce increases income dispersion by way of widening the bottom end of the distribution, whereas the proportion of incorporated self-employed contributes to income dispersion at the top end of the distribution. Implications for research are discussed. (C) 2017 The Authors. Published by Elsevier B.V.

  • Halvarsson, Daniel
    et al.
    Ratio, Stockholm, Sverige.
    Korpi, Martin
    Södertörns högskola, Huddinge Sweden.
    Wennberg, Karl
    Linköpings universitet, Linköping, Sverige.
    Entreprenörskap och inkomstspridning: hur företagare påverkar ojämlikheten2017In: Ekonomisk Debatt, ISSN 0345-2646, Vol. 45, no 1, p. 53-59Article in journal (Other academic)
    Abstract [sv]

    Forskningen om inkomstojämlikhet har utvecklat modeller för att analysera inkomstspridning men har underlåtit att inkludera entreprenörskap – ett allt vanligare yrkesval. Vi undersöker hur antalet och typen av företagare påverkar inkomstskillnaderna i Sverige. Vi finner en tydlig polariseringseffekt av andelen företagare i arbetskraften: Egenföretagare ökar inkomstspridningen genom att flertalet har låga inkomster relativt löntagare, medan det omvända gäller för aktiebolagsföretagare. Påverkan sker således främst i svansarna av fördelningen, och den tycks vara som störst för egenföretagare.

  • Mullin, Lauren Gayle
    Örebro University, School of Science and Technology.
    Advances in Mass Spectrometry for the Analysis of Emerging Persistent Organic Pollutants2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Mass spectrometry (MS) is a technique widely implemented for the measurement of environmental pollutants. A critical tool for the analysis of persistent organic pollutants (POPs) over several decades, MS as coupled with liquid and gas chromatography (LC and GC) techniques enables the analysis of emerging POPs. The aim of this thesis was to investigate the use of alternative MS-based techniques to assist specific analytical challenges including separation of stereoisomers using supercritical fluid chromatography (SFC), reduced ionization competition with appropriate mobile phase additives, and applied rotationally averaged collision-cross section (CCS) of ions via ion mobility measurements of emerging POPs.

    Chromatographic efficiency improvements for the brominated flame retardant, hexabromocyclododecane (HBCDD), were implemented through the development of two supercritical fluid chromatography (SFC) methods. Based on the inherent qualities of supercritical fluids, separation of both predominant diastereomers and respective enantiomers was performed in a shorter time with wider chromatographic resolution using SFC than existing LC methods.

    Turning next to MS ionization considerations, the emerging perfluoroalkyl substance hexafluoropropylene oxide-dimer acid (HFPO-DA) was investigated. Following a survey of analytical methodologies for HFPO-DA, the challenge of extreme dimer formation, in-source fragmentation and very low [M-H]- production was described. Method development using alternative mobile phase additives in currently used LC-MS acquisition techniques was deployed.

    Finally, ion mobility spectrometry (IMS) was implemented in a non-targeted acquisition study of indoor dust samples. This study used IMS coupled with quadrupole time-of-flight MS to identify a wide range of contaminant classes, including emerging POPs. Identification confidence is a challenge currently facing non-targeted studies, and the use of prediction mechanisms of analyte IMS gas-phase separations was explored.

    Through applying diverse alternative techniques, increased method performance was explored for emerging POPs analyses.

    List of papers
    1. Rapid separation of hexabromocyclododecane diastereomers using a novel method combining convergence chromatography and tandem mass spectrometry
    Open this publication in new window or tab >>Rapid separation of hexabromocyclododecane diastereomers using a novel method combining convergence chromatography and tandem mass spectrometry
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    2015 (English)In: Analytical Methods, ISSN 1759-9660, E-ISSN 1759-9679, Vol. 7, no 7, p. 2950-2958Article in journal (Refereed) Published
    Abstract [en]

    Analysis of the brominated flame retardant hexabromocyclododecane (HBCDD) is characterized by the separation of its three predominant diastereomers. This analysis is typically performed using reversed phase liquid chromatography (RPLC) coupled with mass spectrometric (MS) detection with analysis times in the order of 10 minutes or greater. Here we describe a rapid method using supercritical CO2 and methanol to baseline separate the three most abundant HBCDD diastereomers within a three minute run time using a High Strength Silica (HSS) C18 1.8 mu m particle size column. A unique elution order of the alpha-, beta- and gamma-HBCDD diastereomers using supercritical CO2 was observed, and can be used as an orthogonal separation for further confidence in diastereomer identification when used in conjuction with RPLC. A tandem quadrupole mass spectrometer with negative mode electrospray ionization was used for detection, operating in multiple reaction monitoring (MRM) mode. Ionization was enhanced by the addition of a make-up flow, which was introduced to the post-column effluent. Method limit of detection (LOD) and limit of quantification (LOQ) for alpha-, beta- and gamma-HBCDD were based on peak-to-peak signal to noise ratios of greater than 3 or 10, respectively. The LOD for all HBCDD diastereomers as solvent standards was 100 fg on-column, and LOQs 500 fg on-column for alpha- and gamma-HBCDD and 250 fg on-column for beta-HBCDD. In order to test the efficiency of this method, small subsets of complex human serum and whale blubber extracts were analyzed using this method, resulting in positive detections in samples of alpha-HBCDD.

    Place, publisher, year, edition, pages
    Royal Society of Chemistry, 2015
    National Category
    Analytical Chemistry
    Research subject
    Analytical Chemistry
    Identifiers
    urn:nbn:se:oru:diva-44434 (URN)10.1039/c4ay02923b (DOI)000351931000008 ()
    Available from: 2015-04-24 Created: 2015-04-24 Last updated: 2019-10-09Bibliographically approved
    2. Enantioselective Analytical- and Preparative-Scale Separation of Hexabromocyclododecane Stereoisomers Using Packed Column Supercritical Fluid Chromatography
    Open this publication in new window or tab >>Enantioselective Analytical- and Preparative-Scale Separation of Hexabromocyclododecane Stereoisomers Using Packed Column Supercritical Fluid Chromatography
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    2016 (English)In: Molecules, ISSN 1420-3049, E-ISSN 1420-3049, Vol. 21, no 11, article id 1509Article in journal (Refereed) Published
    Abstract [en]

    Hexabromocyclododecane (HBCDD) is an additive brominated flame retardant which has been listed in Annex A of the Stockholm Convention for elimination of production and use. It has been reported to persist in the environment and has the potential for enantiomer-specific degradation, accumulation, or both, making enantioselective analyses increasingly important. The six main stereoisomers of technical HBCDD (i.e., the (+) and (-) enantiomers of α-, β-, and γ-HBCDD) were separated and isolated for the first time using enantioselective packed column supercritical fluid chromatography (pSFC) separation methods on a preparative scale. Characterization was completed using published chiral liquid chromatography (LC) methods and elution profiles, as well as X-ray crystallography, and the isolated fractions were definitively identified. Additionally, the resolution of the enantiomers, along with two minor components of the technical product (δ- and ε-HBCDD), was investigated on an analytical scale using both LC and pSFC separation techniques, and changes in elution order were highlighted. Baseline separation of all HBCDD enantiomers was achieved by pSFC on an analytical scale using a cellulose-based column. The described method emphasizes the potential associated with pSFC as a green method of isolating and analyzing environmental contaminants of concern.

    Place, publisher, year, edition, pages
    Basel, Switzerland: MDPI AG, 2016
    Keywords
    hexabromocyclododecane, enantiomeric separation, supercritical fluid chromatography
    National Category
    Analytical Chemistry
    Identifiers
    urn:nbn:se:oru:diva-53487 (URN)10.3390/molecules21111509 (DOI)000389918200091 ()27834934 (PubMedID)2-s2.0-84997428723 (Scopus ID)
    Available from: 2016-11-15 Created: 2016-11-14 Last updated: 2019-10-02Bibliographically approved
    3. Analysis of hexafluoropropylene oxide-dimer acid (HFPO-DA) by liquid chromatography-mass spectrometry (LC-MS): Review of current approaches and environmental levels
    Open this publication in new window or tab >>Analysis of hexafluoropropylene oxide-dimer acid (HFPO-DA) by liquid chromatography-mass spectrometry (LC-MS): Review of current approaches and environmental levels
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    2019 (English)In: TrAC. Trends in analytical chemistry, ISSN 0165-9936, E-ISSN 1879-3142, Vol. 118, p. 828-839Article, review/survey (Refereed) Published
    Abstract [en]

    Emerging per- and polyfluorinated compounds (PFAS) compounds are of increasing interest for environmental monitoring, one being hexafluoropropylene oxide-dimer acid (HFPO-DA), commonly referred to as GenX. The following review describes existing liquid chromatography-mass spectrometry (LC-MS) methods used to analyse HFPO-DA, including sample preparation and method sensitivity relative to other PFAS. Analytical challenges are also described, in particular the significant formation of in-source fragmentation, dimer and dimer adducts which detract from [M-H](-) signal. Lastly, detected levels of HFPO-DA in environmental and biological samples are compared across the limited number of available field exposure studies, which found several mu g/L concentrations in water samples taken near fluorochemical plant discharges.

    Place, publisher, year, edition, pages
    Elsevier, 2019
    Keywords
    HFPO-DA, GenX, Negative polarity electrospray ionisation, Liquid chromatography, Mass spectrometry
    National Category
    Chemical Sciences
    Identifiers
    urn:nbn:se:oru:diva-76970 (URN)10.1016/j.trac.2019.05.015 (DOI)000486383900064 ()31501636 (PubMedID)
    Note

    Funding Agency:

    Intramural EPA  EPA999999

    Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-10-02Bibliographically approved
    4. Ionization Enhancement of Hexafluoropropylene oxide dimer acid (HFPO-DA) Through Mobile Phase Additive Selection
    Open this publication in new window or tab >>Ionization Enhancement of Hexafluoropropylene oxide dimer acid (HFPO-DA) Through Mobile Phase Additive Selection
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    (English)Manuscript (preprint) (Other academic)
    National Category
    Other Chemistry Topics
    Identifiers
    urn:nbn:se:oru:diva-76979 (URN)
    Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-10-02Bibliographically approved
    5. Liquid Chromatography-Ion Mobility-High Resolution Mass Spectrometry for Analysis of Pollutants in Indoor Dust: Identification and Predictive Capabilities
    Open this publication in new window or tab >>Liquid Chromatography-Ion Mobility-High Resolution Mass Spectrometry for Analysis of Pollutants in Indoor Dust: Identification and Predictive Capabilities
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    (English)Manuscript (preprint) (Other academic)
    National Category
    Other Chemistry Topics
    Identifiers
    urn:nbn:se:oru:diva-76980 (URN)
    Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-10-02Bibliographically approved
  • Dissels, Rosita
    et al.
    Department of Sociology, Vrije Universiteit, Amsterdam, The Netherlands.
    Lui Gallassi, Ada
    Örebro University, School of Law, Psychology and Social Work.
    Sue Westwood (ed.) (2019). Ageing, Diversity and Equality: Social Justice Perspectives. Abingdon and New York: Routledge, 376 pp. ISBN: 978-0-415-78669-0 (hardback) [Book review]2012In: International Journal of Ageing and Later Life, ISSN 1652-8670, E-ISSN 1652-8670, Vol. 2, p. 153-157Article, book review (Refereed)
  • Grimbeek, Marinette
    Örebro University, University Library. Institutionen för språk, litteratur och interkultur (from 2013), Karlstads universitet, Karlstad.
    Margaret Atwood's Environmentalism: Apocalypse and Satire in the MaddAddam Trilogy2017Doctoral thesis, monograph (Other academic)
    Abstract [en]

    This study considers the way in which Margaret Atwood’s post-apocalyptic MaddAddam Trilogy functions as an environmental project. The main focus is on how the three novels, Oryx and Crake (2003), The Year of the Flood (2009), and MaddAddam (2013), simultaneously draw on and destabilise the apocalypticism inherent in so much environmental discourse, primarily through the use of satire. The trilogy is securely anchored in the concerns of contemporary readers, and transposition of the action to the near future is integral to Atwood’s environmental project: attention is focussed on the present causes of anticipated environmental catastrophe, which readers implicitly are implored to avoid. Atwood’s environmentalism is performed in the interplay between her literary stature, the equivocal content of her work, and the irreverence with which she metaleptically blurs distinctions between fact and fiction, art and commodity, and activism and aesthetics. Whereas the satiric mode serves as a way of avoiding some of the limitations of apocalyptic thinking by maintaining and even creating complexity, it also renders the entire project ambiguous. Uncertainty about the exact environmental injunction presented in the trilogy creates doubts about the degree to which Atwood’s extradiegetic environmental activism should be taken seriously, or conversely. Storytelling is foregrounded in all three novels, and through its concurrent critique of and reliance on market forces and the political potential of art, the MaddAddam Trilogy demonstrates that there is no external position from which the imagination can perform environmentalist miracles. As such, Atwood’s environmental project furthers a profoundly ecological understanding of the world.

  • Dennhag, Inga
    et al.
    Department of Clinical Science, Child and Adolescent Psychiatry, Umeå University, Sweden.
    Steinvall, Anders
    Department of Language Studies, Umeå University, Sweden.
    Hakelind, Camilla
    Department of Psychology, Umeå University, Sweden.
    Deutschmann, Mats
    Örebro University, School of Humanities, Education and Social Sciences.
    Exploring gender stereotypes about interpersonal behavior and personality factors using digital matched-guise techniques2019In: Social behavior and personality, ISSN 0301-2212, E-ISSN 1179-6391, Vol. 47, no 8, p. 1-13, article id e8150Article in journal (Refereed)
    Abstract [en]

    The current study explores gender stereotypes among Swedish university students (n=101) studying a course in psychology, using a matched-guise experimental design. The gender identity of a speaker in a dialogue, manifested by voice, was digitally manipulated to sound male or female. Responses to the recordings indicated that an actor with a male voice was rated significantly less conscientious, agreeable, extraverted, and open to experience than the same actor with a female voice. On social behavior, there was a tendency for the actor with a male voice to be rated as more hostile than the same actor with a female voice. The study suggests that stereotype effects rather than real behavioral differences may have an impact on perceived gender differences.

  • Fischer, Per
    Örebro University, School of Medical Sciences.
    Hemi and total wrist arthroplasty2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Aim: To study implant survival and implant loosening following primary total wrist arthroplasty (TWA) using four different implants. To report outcome following wrist revision arthroplasty. To evaluate a new radial wrist hemi arthroplasty (RWHA) design clinically and biomechanically.

    Method: The studies included 136 primary TWAs and 16 revision TWAs, both studies with prospectively collected data. Six fresh frozen cadaveric wrist specimen were used for biomechanical analysis. The RHWA was evaluated clinically in a pilot series of 20 cases.

    Results: Total implant survival was 92% but with high frequency of implant loosening of surviving Re-Motion implants. None of the surviving Maestro implants were considered radiographically loose. Implant survival following revision arthroplasty was 75%, considerably lower than following primary TWAs. However, none of the patients with surviving revision implants had pain at rest and little or no pain in activity. The surgical procedure and placement of the RHWA was feasible. Overall, the kinematic and functional changes appeared acceptable compared to the native wrist. None of the patients underwent revision following RHWA but reoperation was performed in 7 patients on the indication of persistent pain. However, patients reported relief of pain and improvement of patient-reported outcome measures.

    Conclusion: High long-term implant survival and no signs of radiographic loosening was found for the Maestro implant. However, the Maestro implant is no longer available on the market and we believe there is a need for new TWA designs. Revision arthroplasty is a valid option in the management of failed TWA. However, implant survival is lower than for primary TWAs and as many as 25% require additional surgery. Promising results were found using the new RHWA design but the implant needs modification before further testing.

    List of papers
    1. Total wrist arthroplasty, a 10 year follow-up
    Open this publication in new window or tab >>Total wrist arthroplasty, a 10 year follow-up
    (English)Manuscript (preprint) (Other academic)
    National Category
    Surgery
    Identifiers
    urn:nbn:se:oru:diva-77452 (URN)
    Available from: 2019-10-18 Created: 2019-10-18 Last updated: 2019-10-18Bibliographically approved
    2. Revision Arthroplasty of the Wrist in Patients With Rheumatoid Arthritis, Mean Follow-Up 6.6 Years
    Open this publication in new window or tab >>Revision Arthroplasty of the Wrist in Patients With Rheumatoid Arthritis, Mean Follow-Up 6.6 Years
    2018 (English)In: Journal of Hand Surgery-American Volume, ISSN 0363-5023, E-ISSN 1531-6564, Vol. 43, no 5, p. 489.e1-489.e7Article in journal (Refereed) Published
    Abstract [en]

    PURPOSE: Management of failed total wrist arthroplasty (TWA) can be challenging; surgical treatment options include salvage arthrodesis, revision arthroplasty, and resection arthroplasty. There are few studies regarding salvage arthrodesis, and revision arthroplasty has been infrequently investigated. The aim of the study was to report the outcome after revision arthroplasty of the wrist.

    METHODS: A retrospective cohort of 16 revision TWAs was evaluated between 2003 and 2016. Data were collected before surgery and 1 and 5 years after surgery. The indication for revision arthroplasty was failed TWA. The primary end point was implant survival. Secondary outcome measures included visual analog scale (VAS) pain scores, range of motion, handgrip strength, and functional scoring with the Canadian Occupational Performance Measure (COPM), Patient-Rated Wrist Evaluation (PRWE), and Disabilities of the Arm, Shoulder, and Hand (DASH).

    RESULTS: Mean follow-up was 6.6 years. Synthetic bone graft was used in 9 cases, allograft corticocancellous bone graft in 1 case, and cement in 6 cases. Of the 16 revision TWAs, 4 were re-revised, 1 because of infection, and 3 cases underwent total wrist arthrodesis. In the non-re-revised cases, range of motion and grip strength was preserved compared with preoperative results. The VAS pain score in activity improved, but not significantly, at 1 (median, 1; range, 0-4.5) and 5 years after surgery (median, 0) compared with before surgery (median, 5). The COPM performance and satisfaction as well as PRWE scores improved significantly at 1 year (median COPM performance, 4.8; COPM satisfaction, 5.6; and PRWE, 24) and improved, but not significantly, at the 5-year follow (median COPM performance, 4.8; COPM satisfaction, 5.0; and PRWE, 37) in the non-re-revised cases.

    CONCLUSIONS: Revision arthroplasty of the wrist is a valid motion-preserving option to wrist arthrodesis in the management of failed TWA. However, the outcome is uncertain and as many as 25% require additional surgery.

    TYPE OF STUDY/LEVEL OF EVIDENCE: Therapeutic IV.

    Place, publisher, year, edition, pages
    Elsevier, 2018
    Keywords
    Total wrist arthroplasty, osteoarthritis, rheumatoid arthritis
    National Category
    Orthopaedics Surgery
    Identifiers
    urn:nbn:se:oru:diva-67046 (URN)10.1016/j.jhsa.2017.10.038 (DOI)000432437100018 ()29224946 (PubMedID)2-s2.0-85044505797 (Scopus ID)
    Note

    Funding Agency:

    Örebro County Council Research Committee

    Available from: 2018-05-18 Created: 2018-05-18 Last updated: 2019-10-18Bibliographically approved
    3. Functional and Kinematic Analysis of a Wrist Radial Hemiarthrosplasty Design
    Open this publication in new window or tab >>Functional and Kinematic Analysis of a Wrist Radial Hemiarthrosplasty Design
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    2018 (English)In: Journal of Musculoskeletal Research, ISSN 0218-9577, Vol. 21, no 1, article id 1850005Article in journal (Refereed) Published
    Abstract [en]

    Purpose: A biomechanical functional assessment was performed on a newly designed wrist hemiarthroplasty implant with aimed to identifying differences between the native wrist and wrist following the hemiarthroplasty procedure with (Hemi+PRC) and without a proximal row carpectomy (Hemi).

    Methods: Six cadaveric wrists were mounted on a custom testing fixture and underwent a series of functional tests to investigate differences in range of motion, muscles moment arms, and axis of rotation between the intact and post-operative wrists. The tested movements included manually-driven flexion-extension, radial-ulnar deviation, dart throwers motion, and circumduction.

    Results: The only significant change in range of motion was a decrease in flexion between the intact (77.75±14.40°) and both the Hemi (65.97±17.72°) and Hemi+PRC (60.08±17.18°) conditions. Minor differences in the mean position and variability of the axis of rotation's piercing point were identified. A statistically significant decrease in the flexion moment arm of the flexor carpi radialis was identified between the intact (16.1±2.6mm) and Hemi+PRC (14.0±3.4mm) conditions. Statistically significant decreases were also identified in the radial deviation moment arms of the extensor carpi radialis brevis' between the intact (15.3±7.8mm) and Hemi+PRC (7.3±12.5mm) conditions and the flexor carpi radialis' between the intact (15.3±3.2mm) and Hemi (12.0±5.7mm) conditions as well as in the ulnar deviation moment arm of the extensor carpi ulnaris between the intact (34.9±11.3mm) and Hemi (13.2±21.9mm) conditions.

    Conclusions: While some statistically significant functional changes were identified between the native and hemiarthroplasty wrist, the findings suggest that post-operative function is equally acceptable in hemiarthroplasty with and without resection of the proximal carpal row. © 2018 World Scientific Publishing Company.

    Place, publisher, year, edition, pages
    World Scientific, 2018
    Keywords
    Functional and kinematic analysis, Wrist, Wrist radial hemiarthroplasty design, article, carpal bone, flexor carpi radialis muscle, hemiarthroplasty, human, range of motion, rotation, ulna
    National Category
    Surgery
    Identifiers
    urn:nbn:se:oru:diva-77453 (URN)10.1142/S0218957718500057 (DOI)2-s2.0-85044274774 (Scopus ID)
    Available from: 2019-10-18 Created: 2019-10-18 Last updated: 2019-10-25Bibliographically approved
    4. Clinical, radiographic and patient-perceived outcome after radial hemi-wrist arthroplasty of the wrist with a new implant. A pilot study
    Open this publication in new window or tab >>Clinical, radiographic and patient-perceived outcome after radial hemi-wrist arthroplasty of the wrist with a new implant. A pilot study
    (English)Manuscript (preprint) (Other academic)
    National Category
    Surgery
    Identifiers
    urn:nbn:se:oru:diva-77454 (URN)
    Available from: 2019-10-18 Created: 2019-10-18 Last updated: 2019-10-18Bibliographically approved