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341 results on '"Lundin, B."'

24. Recent developments in clinimetric instruments

Author

BEETON, K., DE KLEIJN, P., HILLIARD, P., FUNK, S., ZOURIKIAN, N., BERGSTROM, B. -M., ENGELBERT, R. H. H., VAN DER NET, J. J., MANCO-JOHNSON, M. J., PETRINI, P., VAN DEN BERG, M., ABAD, A., FELDMAN, B. M., DORIA, A. S., LUNDIN, B., POONNOOSE, P. M., JOHN, J. A., KAVITHA, M. L., PADANKATTI, S. M., DEVADARASINI, M., PAZANI, D., SRIVASTAVA, A., VAN GENDEREN, F. R., and VACHALATHITI, R.

Published
2006

36. Power oscillation damping using controlled reactive power compensation - a comparison between series and shunt approaches

Author

Angquist, L., Lundin, B., and Samuelsson, J.

Subjects
Electric power system stability -- Research, Electric waves -- Damping, Oscillation -- Control, Business, Electronics, Electronics and electrical industries
Abstract

The paper describes how controlled reactive power compensation can be used to damp power systems oscillations. This is of particular interest in the case of weakly coupled networks. A comparison is made between two kinds of controllable reactive power elements, namely the CSC (Controlled Series Capacitor) and the SVC (Static Var Compensator). The essential topics dealt with are efficiency in terms of 'damping effect' per installed Mvar and the dependence of equipment location. Also the influence of connected loads is investigated to some extent. Basic relationships for the CSC and the SVC approaches are shown in appendices.

Published
1993

42. The Arabidopsis Thylakoid Chloride Channel AtCLCe Functions in Chloride Homeostasis and Regulation of Photosynthetic Electron Transport.

Author

Herdean, A, Nziengui, H, Zsiros, O, Solymosi, K, Garab, G, Lundin, B, Spetea, C, Herdean, A, Nziengui, H, Zsiros, O, Solymosi, K, Garab, G, Lundin, B, and Spetea, C

Abstract

Chloride ions can be translocated across cell membranes through Cl(-) channels or Cl(-)/H(+) exchangers. The thylakoid-located member of the Cl(-) channel CLC family in Arabidopsis thaliana (AtCLCe) was hypothesized to play a role in photosynthetic regulation based on the initial photosynthetic characterization of clce mutant lines. The reduced nitrate content of Arabidopsis clce mutants suggested a role in regulation of plant nitrate homeostasis. In this study, we aimed to further investigate the role of AtCLCe in the regulation of ion homeostasis and photosynthetic processes in the thylakoid membrane. We report that the size and composition of proton motive force were mildly altered in two independent Arabidopsis clce mutant lines. Most pronounced effects in the clce mutants were observed on the photosynthetic electron transport of dark-adapted plants, based on the altered shape and associated parameters of the polyphasic OJIP kinetics of chlorophyll a fluorescence induction. Other alterations were found in the kinetics of state transition and in the macro-organization of photosystem II supercomplexes, as indicated by circular dichroism measurements. Pre-treatment with KCl but not with KNO3 restored the wild-type photosynthetic phenotype. Analyses by transmission electron microscopy revealed a bow-like arrangement of the thylakoid network and a large thylakoid-free stromal region in chloroplast sections from the dark-adapted clce plants. Based on these data, we propose that AtCLCe functions in Cl(-) homeostasis after transition from light to dark, which affects chloroplast ultrastructure and regulation of photosynthetic electron transport.

Published
2016

43. A voltage-dependent chloride channel fine-tunes photosynthesis in plants.

Author

Herdean A, Teardo E, Nilsson AK, Pfeil BE, Johansson ON, Ünnep R, Nagy G, Zsiros O, Dana S, Solymosi K, Garab G, Szabó I, Spetea C, Lundin B, Herdean A, Teardo E, Nilsson AK, Pfeil BE, Johansson ON, Ünnep R, Nagy G, Zsiros O, Dana S, Solymosi K, Garab G, Szabó I, Spetea C, and Lundin B

Abstract

In natural habitats, plants frequently experience rapid changes in the intensity of sunlight. To cope with these changes and maximize growth, plants adjust photosynthetic light utilization in electron transport and photoprotective mechanisms. This involves a proton motive force (PMF) across the thylakoid membrane, postulated to be affected by unknown anion (Cl(-)) channels. Here we report that a bestrophin-like protein from Arabidopsis thaliana functions as a voltage-dependent Cl(-) channel in electrophysiological experiments. AtVCCN1 localizes to the thylakoid membrane, and fine-tunes PMF by anion influx into the lumen during illumination, adjusting electron transport and the photoprotective mechanisms. The activity of AtVCCN1 accelerates the activation of photoprotective mechanisms on sudden shifts to high light. Our results reveal that AtVCCN1, a member of a conserved anion channel family, acts as an early component in the rapid adjustment of photosynthesis in variable light environments.

Published
2016

49. A randomized clinical trial of prophylaxis in children with hemophilia A (the ESPRIT study)

Author

Gringeri, A, Lundin, B, Von Mackensen, S, Mantovani, L, Mannucci, P, Esprit, MANTOVANI, LORENZO GIOVANNI, Gringeri, A, Lundin, B, Von Mackensen, S, Mantovani, L, Mannucci, P, Esprit, and MANTOVANI, LORENZO GIOVANNI

Abstract

Background: Prevention of arthropathy is a major goal of hemophilia treatment. While studies in adults have demonstrated an impact of prophylaxis on the incidence of joint bleeds and patients' well-being in terms of improved quality of life (QoL), it is unclear whether or not prophylaxis influences the outcome and perception of well- of children with hemophilia. Objective: This randomized controlled study compared the efficacy of prophylaxis with episodic therapy in preventing hemarthroses and image-proven joint damage in children with severe hemophilia A (factor VIII < 1%) over a 10-year time period. Methods: Forty-five children with severe hemophilia A, aged 1-7 years (median 4), with negative clinical-radiologic joint score at entry and at least one bleed during the previous 6 months, were consecutively randomized to prophylaxis with recombinant factorVIII (25 IU kg-1 3 × week) or episodic therapy with ≥ 25 IU kg-1 every 12-24 h until complete clinical bleeding resolution. Safety, feasibility, direct costs and QoL were also evaluated. Results: Twenty-one childrenwere assigned to prophylaxis, 19 to episodic treatment. Children on prophylaxis had fewer hemarthroses than children on episodic therapy: 0.20 vs. 0.52 events per patient per month (P < 0.02). Plainfilm radiology showed signs of arthropathy in six patients on prophylaxis (29%) vs. 14 on episodic treatment (74%) (P < 0.05). Prophylaxis was more effective when started early (≤ 36 months), with patients having fewer joint bleeds (0.12 joint bleeds per patient per month) and no radiologic signs of arthropathy. Conclusion: This randomized trial confirms the efficacy of prophylaxis in preventing bleeds and arthropathy in children with hemophilia, particularly when it is initiated early in life

Published
2011

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