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  • 1.
    Adler, Lennart
    et al.
    Göteborgs universitet.
    Wadskog, Ingrid
    Jönköping University, School of Engineering, JTH, Chemical Engineering.
    Ion homeostasis in Saccharomyces cerevisiae under NaCl stress2003In: Yeast stress responses / [ed] Stefan Hohmann, Willem H. Mager, Berlin: Springer , 2003, p. 201-239Chapter in book (Other academic)
  • 2. Ahlgren, Jennie
    et al.
    Görman, Ulf
    Önning, Gunilla
    Ska generna styra vad vi äter?2005In: Miljöforskning, no 3Article in journal (Other (popular science, discussion, etc.))
  • 3.
    Alatalo, Juha M.
    et al.
    Department of Biological and Environmental Sciences, College of Arts and Sciences, Qatar University, Doha, Qatar.
    Jägerbrand, Annika K.
    Jönköping University, School of Engineering, JTH, Civil Engineering and Lighting Science.
    Chen, Shengbin
    College of Ecology and Environment, Chengdu University of Technology, Chengdu, China.
    Sun, Shou-Qin
    Institute of Mountain Hazards and Environment, Chinese Academy of Science, Chengdu, China.
    Molau, Ulf
    Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden.
    Bryophyte cover and richness decline after 18 years of experimental warming in Alpine SwedenManuscript (preprint) (Other academic)
    Abstract [en]

    1. Bryophytes in the Arctic and Alpine regions are important in terms of biodiversity, cover and biomass. However, climate change and widespread shrubification of alpine and arctic tundra is predicted to increase in the future, with potentially large impacts on bryophyte communities.

    2. We studies the impact of 18 years of experimental warming with open top chambers (OTCs) on bryophyte cover, richness and diversity in an alpine mesic meadow and a heath plant community in Northern Sweden. In addition we investigated the relationship between deciduous shrubs and bryophytes.

    3. Cover and richness of bryophytes both declined due to long-term warming, while diversity did not show any significant responses. After 18 years, bryophyte cover had decreased by 71% and 26 in the heath and meadow, while richness declined by 39% and 26%, respectively.

    4. Synthesis. Decline in total bryophyte cover in both communities in response to long-term warming was driven by a general decline in many species, with only two individual species showing significant declines. Although most of the species included in the individual analyses did not show any detectable changes, the cumulative change in all species was significant. In addition, species loss was slower than the general decline in bryophyte abundance. As hypothesized, we found significant negative relationship between deciduous shrub cover and bryophyte cover, but not bryophyte richness, in both plant communities. This is likely due to a more delayed decline in species richness compared to abundance, similar to what was observed in response to long-term warming.

  • 4.
    Alatalo, Juha M
    et al.
    Qatar University.
    Jägerbrand, Annika K.
    Statens väg- och transportforskningsinstitut, Miljö, MILJÖ.
    Čuchta, Peter
    Academy of Science of the Czech Republic.
    Collembola at three alpine subarctic sites resistant to twenty years of experimental warming2015In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 5, article id 18161Article in journal (Refereed)
    Abstract [en]

    This study examined the effects of micro-scale, site and 19 and 21 years of experimental warming on Collembola in three contrasting alpine subarctic plant communities (poor heath, rich meadow, wet meadow). Unexpectedly, experimental long-term warming had no significant effect on species richness, effective number of species, total abundance or abundance of any Collembola species. There were micro-scale effects on species richness, total abundance, and abundance of 10 of 35 species identified. Site had significant effect on effective number of species, and abundance of six species, with abundance patterns differing between sites. Site and long-term warming gave non-significant trends in species richness.

    The highest species richness was observed in poor heath, but mean species richness tended to be highest in rich meadow and lowest in wet meadow. Warming showed a tendency for a negative impact on species richness. This long-term warming experiment across three contrasting sites revealed that Collembola is capable of high resistance to climate change. We demonstrated that micro-scale and site effects are the main controlling factors for Collembola abundance in high alpine subarctic environments. Thus local heterogeneity is likely important for soil fauna composition and may play a crucial role in buffering Collembola against future climate change.

  • 5.
    Alatalo, Juha M.
    et al.
    Uppsala universitet, Växtekologi och evolution.
    Little, Chelsea J.
    Uppsala universitet, Växtekologi och evolution.
    Jägerbrand, Annika K.
    Statens väg- och transportforskningsinstitut, Samhälle, miljö och transporter, SAMT, Miljö, MILJÖ.
    Molau, Ulf
    Vascular plant abundance and diversity in an alpine heath under observed and simulated global change2015In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 5, article id 10197Article in journal (Refereed)
    Abstract [en]

    Global change is predicted to cause shifts in species distributions and biodiversity in arctic tundra. We applied factorial warming and nutrient manipulation to a nutrient and species poor alpine/arctic heath community for seven years. Vascular plant abundance in control plots increased by 31%. There were also notable changes in cover in the nutrient and combined nutrient and warming treatments, with deciduous and evergreen shrubs declining, grasses overgrowing these plots. Sedge abundance initially increased significantly with nutrient amendment and then declined, going below initial values in the combined nutrient and warming treatment. Nutrient addition resulted in a change in dominance hierarchy from deciduous shrubs to grasses. We found significant declines in vascular plant diversity and evenness in the warming treatment and a decline in diversity in the combined warming and nutrient addition treatment, while nutrient addition caused a decline in species richness. The results give some experimental support that species poor plant communities with low diversity may be more vulnerable to loss of species diversity than communities with higher initial diversity. The projected increase in nutrient deposition and warming may therefore have negative impacts on ecosystem processes, functioning and services due to loss of species diversity in an already impoverished environment.

  • 6.
    Ali, Arshad
    et al.
    East China Normal University.
    Molau, Ulf
    Göteborgs Universitet.
    Bai, Yang
    Chinese Academy of Sciences.
    Jägerbrand, Annika K.
    Statens väg- och transportforskningsinstitut, Miljö, MILJÖ.
    Alatalo, Juha M.
    Qatar University.
    Diversity-productivity dependent resistance of an alpine plant community to different climate change scenarios2016In: Ecological research, ISSN 0912-3814, E-ISSN 1440-1703, Vol. 31, no 6, p. 935-945Article in journal (Refereed)
    Abstract [en]

    Here we report from a experiment imposing different warming scenarios [control with ambient temperature, constant level of moderate warming for 3 years, stepwise increase in warming for 3 years, and one season of high level warming (pulse) simulating an extreme summer event] on an alpine ecosystem to study the impact on species diversity–biomass relationship, and community resistance in terms of biomass production.

    Multiple linear mixed models indicate that experimental years had stronger influence on biomass than warming scenarios and species diversity. Species diversity and biomass had almost humpback relationships under different warming scenarios over different experimental years. There was generally a negative diversity–biomass relationship, implying that a positive diversity–biomass relationship was not the case.

    The application of different warming scenarios did not change this tendency. The change in community resistance to all warming scenarios was generally negatively correlated with increasing species diversity, the strength of the correlation varying both between treatments and between years within treatments. The strong effect of experimental years was consistent with the notion that niche complementarity effects increase over time, and hence, higher biomass productivity over experimental years. The strongest negative relationship was found in the first year of the pulse treatment, indicating that the community had weak resistance to an extreme event of one season of abnormally warm climate.

    Biomass production started recovering during the two subsequent years. Contrasting biomass-related resistance emerged in the different treatments, indicating that micro sites within the same plant community may differ in their resistance to different warming scenarios.

  • 7. Antoniou, A. C.
    et al.
    Sinilnikova, O. M.
    McGuffog, L.
    Healey, S.
    Nevanlinna, H.
    Heikkinen, T.
    Simard, J.
    Spurdle, A. B.
    Beesley, J.
    Chen, X.
    Neuhausen, S. L.
    Ding, Y. C.
    Couch, F. J.
    Wang, X.
    Fredericksen, Z.
    Peterlongo, P.
    Peissel, B.
    Bonanni, B.
    Viel, A.
    Bernard, L.
    Radice, P.
    Szabo, C. I.
    Foretova, L.
    Zikan, M.
    Claes, K.
    Greene, M. H.
    Mai, P. L.
    Rennert, G.
    Lejbkowicz, F.
    Andrulis, I. L.
    Ozcelik, H.
    Glendon, G.
    Gerdes, A. -M
    Thomassen, M.
    Sunde, L.
    Caligo, M. A.
    Laitman, Y.
    Kontorovich, T.
    Cohen, S.
    Kaufman, B.
    Dagan, E.
    Baruch, R. G.
    Friedman, E.
    Harbst, K.
    Barbany-Bustinza, G.
    Rantala, J.
    Ehrencrona, H.
    Karlsson, P.
    Domchek, S. M.
    Nathanson, K. L.
    Osorio, A.
    Blanco, I.
    Lasa, A.
    Benítez, J.
    Hamann, U.
    Hogervorst, F. B. L.
    Rookus, M. A.
    Collee, J. M.
    Devilee, P.
    Ligtenberg, M. J.
    van der Luijt, R. B.
    Aalfs, C. M.
    Waisfisz, Q.
    Wijnen, J.
    van Roozendaal, C. E. P.
    Peock, S.
    Cook, M.
    Frost, D.
    Oliver, C.
    Platte, R.
    Evans, D. G.
    Lalloo, F.
    Eeles, R.
    Izatt, L.
    Davidson, R.
    Chu, C.
    Eccles, D.
    Cole, T.
    Hodgson, S.
    Godwin, A. K.
    Stoppa-Lyonnet, D.
    Buecher, B.
    Léoné, M.
    Bressac-de Paillerets, B.
    Remenieras, A.
    Caron, O.
    Lenoir, G. M.
    Sevenet, N.
    Longy, M.
    Ferrer, S. F.
    Prieur, F.
    Goldgar, D.
    Miron, A.
    John, E. M.
    Buys, S. S.
    Daly, M. B.
    Hopper, J. L.
    Terry, M. B.
    Yassin, Y.
    Singer, C.
    Gschwantler-Kaulich, D.
    Staudigl, C.
    Hansen, T. V. O.
    Barkardottir, R. B.
    Kirchhoff, T.
    Pal, P.
    Kosarin, K.
    Offit, K.
    Piedmonte, M.
    Rodriguez, G. C.
    Wakeley, K.
    Boggess, J. F.
    Basil, J.
    Schwartz, P. E.
    Blank, S. V.
    Toland, A. E.
    Montagna, M.
    Casella, C.
    Imyanitov, E. N.
    Allavena, A.
    Schmutzler, R. K.
    Versmold, B.
    Engel, C.
    Meindl, A.
    Ditsch, N.
    Arnold, N.
    Niederacher, D.
    Deißler, H.
    Fiebig, B.
    Suttner, C.
    Schönbuchner, I.
    Gadzicki, D.
    Caldes, T.
    de la Hoya, M.
    Pooley, K. A.
    Easton, D. F.
    Chenevix-Trench, G.
    Common variants in LSP1, 2q35 and 8q24 and breast cancer risk for BRCA1 and BRCA2 mutation carriers2009In: Human Molecular Genetics, ISSN 0964-6906, E-ISSN 1460-2083, Vol. 18, no 22, p. 4442-4456Article in journal (Refereed)
    Abstract [en]

    Genome-wide association studies of breast cancer have identified multiple single nucleotide polymorphisms (SNPs) that are associated with increased breast cancer risks in the general population. In a previous study, we demonstrated that the minor alleles at three of these SNPs, in FGFR2, TNRC9 and MAP3K1, also confer increased risks of breast cancer for BRCA1 or BRCA2 mutation carriers. Three additional SNPs rs3817198 at LSP1, rs13387042 at 2q35 and rs13281615 at 8q24 have since been reported to be associated with breast cancer in the general population, and in this study we evaluated their association with breast cancer risk in 9442 BRCA1 and 5665 BRCA2 mutation carriers from 33 study centres. The minor allele of rs3817198 was associated with increased breast cancer risk only for BRCA2 mutation carriers [hazard ratio (HR) = 1.16, 95% CI: 1.07-1.25, P-trend = 2.8 × 10-4]. The best fit for the association of SNP rs13387042 at 2q35 with breast cancer risk was a dominant model for both BRCA1 and BRCA2 mutation carriers (BRCA1: HR = 1.14, 95% CI: 1.04-1.25, P = 0.0047; BRCA2: HR = 1.18 95% CI: 1.04-1.33, P = 0.0079). SNP rs13281615 at 8q24 was not associated with breast cancer for either BRCA1 or BRCA2 mutation carriers, but the estimated association for BRCA2 mutation carriers (per-allele HR = 1.06, 95% CI: 0.98-1.14) was consistent with odds ratio estimates derived from population-based case-control studies. The LSP1 and 2q35 SNPs appear to interact multiplicatively on breast cancer risk for BRCA2 mutation carriers. There was no evidence that the associations vary by mutation type depending on whether the mutated protein is predicted to be stable or not. 

  • 8.
    Askerlund, Per
    Jönköping University, School of Education and Communication, HLK, Disciplinary Research. Department of Plant Biochemistry, Lund University, Lund, Sweden.
    Calmodulin-stimulated Ca2+-ATPases in the vacuolar and plasma membranes in cauliflower1997In: Plant Physiology, ISSN 0032-0889, E-ISSN 1532-2548, Vol. 114, no 3, p. 999-1007Article in journal (Refereed)
    Abstract [en]

    The subcellular locations of Ca2+-ATPases in the membranes of cauliflower (Brassica oleracea L.) inflorescences were investigated. After continuous sucrose gradient centrifugation a 111-kD calmodulin (CaM)-stimulated and CaM-binding Ca2+-ATPase (BCA1; P. Askerlund [1996] Plant Physiol 110: 913–922; S. Malmstrom, P. Askerlund, M.G. Palmgren [1997] FEBS Lett 400: 324–328) comigrated with vacuolar membrane markers, whereas a 116-kD CaM-binding Ca2+-ATPase co-migrated with a marker for the plasma membrane. The 116-kD Ca2+-ATPase was enriched in plasma membranes obtained by aqueous two-phase partitioning, which is in agreement with a plasma membrane location of this Ca2+-ATPase. Countercurrent distribution of a low-density intracellular membrane fraction in an aqueous two-phase system resulted in the separation of the endoplasmic reticulum and vacuolar membranes. The 111-kD Ca2+-ATPase co-migrated with a vacuolar membrane marker after countercurrent distribution but not with markers for the endoplasmic reticulum. A vacuolar membrane location of the 111-kD Ca2+-ATPase was further supported by experiments with isolated vacuoles from cauliflower: (a) Immunoblotting with an antibody against the 111-kD Ca2+-ATPase showed that it was associated with the vacuoles, and (b) ATP-dependent Ca2+ uptake by the intact vacuoles was found to be CaM stimulated and partly protonophore insensitive.

  • 9.
    Askerlund, Per
    Jönköping University, School of Education and Communication, HLK, Disciplinary Research. Department of Plant Biochemistry, Lund University, Lund, Sweden.
    Modulation of an Intracellular Calmodulin-Stimulated Ca2+-Pumping ATPase in Cauliflower by Trypsin (The Use of Calcium Green-5N to Measure Ca2+ Transport in Membrane Vesicles)1996In: Plant Physiology, ISSN 0032-0889, E-ISSN 1532-2548, Vol. 110, no 3, p. 913-922Article in journal (Refereed)
    Abstract [en]

    The effect of controlled trypsin digestion of a calmodulin-stimulated Ca2+-ATPase in low-density intracellular membranes from cauliflower (Brassica oleracea L.) inflorescences was investigated. Ca2+ uptake into vesicles was measured either continuously with the fluorescent Ca2+ indicator Calcium Green-5N or with a radio-active filter technique. Trypsin treatment of vesicles resulted in a 3-fold activation of Ca2+ uptake and loss of calmodulin sensitivity. Immunoblotting experiments with an antiserum raised against the Ca2+-ATPase showed that the trypsin activation was accompanied by a decrease in the amount of intact Ca2+-ATPase (111 kD) and by successive appearances of polypeptides of 102 and 99 to 84 kD. 125I-Calmodulin overlays showed that only the intact Ca2+-ATPase bound calmodulin. Removal of the calmodulin-binding domain (about 9 kD) was not enough to obtain full activation. Trypsin proteolysis resulted in a Ca2+ concentration necessary for half-maximal activity of 0.5 [mu]M, whereas a value of about 2 [mu]M was obtained with untreated membranes in the presence of calmodulin. Without trypsin treatment or calmodulin the activity was not saturated even at 57 [mu]M free Ca2+. The data suggest that trypsin digestion and calmodulin activate the cauliflower Ca2+-ATPase by at least partly different mechanisms.

  • 10.
    Askerlund, Per
    et al.
    Jönköping University, School of Education and Communication, HLK, Disciplinary Research.
    Evans, David
    Detection of distinct phosphorylated intermediates of Ca2+-ATPase and H+-ATPase in plasma membranes from Brassica oleracea1993In: Plant physiology and biochemistry (Paris), ISSN 0981-9428, E-ISSN 1873-2690, Vol. 31, no 5, p. 787-791Article in journal (Refereed)
    Abstract [en]

    Two distinct phosphorylated intermediates representing the Ca2+-ATPase and H+-ATPase, respectively, were detected after phosphorylation of plasma membranes from cauliflower (Brassica oleracea L.) inflorescences with [gammaP-32]ATP and separation of polypeptides in an acidic gel. A 116 kDa polypeptide was identified as a Ca2+-ATPase by its Ca2+-dependent phosphorylation which was enhanced by La3+. A second polypeptide (105 kDa) also phosphorylated in the absence of Ca2+ and was identified as the H+-ATPase by immune blotting.

  • 11.
    Askerlund, Per
    et al.
    Jönköping University, School of Education and Communication, HLK, Disciplinary Research. Department of Plant Sciences, University of Oxford, Oxford, United Kingdom.
    Evans, David E.
    Department of Plant Sciences, University of Oxford, Oxford, United Kingdom.
    Reconstitution and Characterization of a Calmodulin-Stimulated Ca-Pumping ATPase Purified from Brassica oleracea L1992In: Plant Physiology, ISSN 0032-0889, E-ISSN 1532-2548, Vol. 100, no 4, p. 1670-1681Article in journal (Refereed)
    Abstract [en]

    Purification and functional reconstitution of a calmodulin-stimulated Ca(2+)-ATPase from cauliflower (Brassica oleracea L.) is described. Activity was purified about 120-fold from a microsomal fraction using calmodulin-affinity chromatography. The purified fraction showed a polypeptide at 115 kD, which formed a phosphorylated intermediate in the presence of Ca(2+), together with a few polypeptides with lower molecular masses that were not phosphorylated. The ATPase was reconstituted into liposomes by 3-([cholamidopropyl]-dimethylammonio-)1-propanesulfonate (CHAPS) dialysis. The proteoliposomes showed ATP-dependent Ca(2+) uptake and ATPase activity, both of which were stimulated about 4-fold by calmodulin. Specific ATPase activity was about 5 mumol min(-1) (mg protein)(-1), and the Ca(2+)/ATP ratio was 0.1 to 0.5 when the ATPase was reconstituted with entrapped oxalate. The purified, reconstituted Ca(2+)-ATPase was inhibited by vanadate and erythrosin B, but not by cyclopiazonic acid and thapsigargin. Activity was supported by ATP (100%) and GTP (50%) and had a pH optimum of about 7.0. The effect of monovalent and divalent cations (including Ca(2+)) on activity is described. Assay of membranes purified by two-phase partitioning indicated that approximately 95% of the activity was associated with intracellular membranes, but only about 5% with plasma membranes. Sucrose gradient centrifugation suggests that the endoplasmic reticulum is the major cellular location of calmodulin-stimulated Ca(2+)-pumping ATPase in Brassica oleracea inflorescences.

  • 12.
    Askerlund, Per
    et al.
    Jönköping University, School of Education and Communication, HLK, Disciplinary Research. Department of Plant Biochemistry, University of Lund, Lund, Sweden.
    Larsson, Christer
    Department of Plant Biochemistry, University of Lund, Lund, Sweden.
    Transmembrane Electron Transport in Plasma Membrane Vesicles Loaded with an NADH-Generating System or Ascorbate1991In: Plant Physiology, ISSN 0032-0889, E-ISSN 1532-2548, Vol. 96, no 4, p. 1178-1184Article in journal (Refereed)
    Abstract [en]

    Sugar beet (Beta vulgaris L.) leaf plasma membrane vesicles were loaded with an NADH-generating system (or with ascorbate) and were tested spectrophotometrically for their ability to reduce external, membrane-impermeable electron acceptors. Either alcohol dehydrogenase plus NAD+ or 100 millimolar ascorbate was included in the homogenization medium, and right-side-out (apoplastic side-out) plasma membrane vesicles were subsequently prepared using two-phase partitioning. Addition of ethanol to plasma membrane vesicles loaded with the NADH-generating system led to a production of NADH inside the vesicles which could be recorded at 340 nanometers. This system was able to reduce 2,6-dichlorophenolindophenol-3′-sulfonate (DCIP-sulfonate), a strongly hydrophilic electron acceptor. The reduction of DCIP-sulfonate was stimulated severalfold by the K+ ionophore valinomycin, included to abolish membrane potential (outside negative) generated by electrogenic transmembrane electron flow. Fe3+-chelates, such as ferricyanide and ferric citrate, as well as cytochrome c, were not reduced by vesicles loaded with the NADH-generating system. In contrast, right-side-out plasma membrane vesicles loaded with ascorbate supported the reduction of both ferric citrate and DCIP-sulfonate, suggesting that ascorbate also may serve as electron donor for transplasma membrane electron transport. Differences in substrate specificity and inhibitor sensitivity indicate that the electrons from ascorbate and NADH were channelled to external acceptors via different electron transport chains. Transplasma membrane electron transport constituted only about 10% of total plasma membrane electron transport activity, but should still be sufficient to be of physiological significance in, e.g. reduction of Fe3+ to Fe2+ for uptake.

  • 13.
    Askerlund, Per
    et al.
    Jönköping University, School of Education and Communication, HLK, Disciplinary Research. Dept of Plant Physiology, Univ. of Lund, Lund, Sweden.
    Larsson, Christer
    Dept of Plant Physiology, Univ. of Lund, Lund, Sweden.
    Widell, Susanne
    Dept of Plant Physiology, Univ. of Lund, Lund, Sweden.
    Cytochromes of plant plasma membranes: Characterization by absorbance difference spectrophotometry and redox titration1989In: Physiologia Plantarum: An International Journal for Plant Biology, ISSN 0031-9317, E-ISSN 1399-3054, Vol. 76, no 2, p. 123-134Article in journal (Refereed)
    Abstract [en]

    The cytochrome composition of plasma membranes (PM) obtained by phase partitioning of microsomal fractions from spinach leaves (Spinacea oleracea L. cv. Medania), cauliflower inflorescences (Brassica oleracea L.), sugar beer leaves (Beta vulgaris L.) and barley (Hordeum vulgare L. cv. Kristina) roots and leaves was characterized by absorbance difference spectrophotometry at different reducing conditions at 20 and – 196°C, by redox titration, and by heme staining of polypeptide bands after lithium dodecyl sulfate polyacrylamide gel electrophoresis (LDS-PAGE). The location of the α-bands in the difference spectra and the loss of heme after treatment with LDS indicated that predominantly cytochromes of the b-type were present in all species tested. The total concentration of cytochrome was ca 0.35 nmol (mg protein)−1. The main component (ca 70% of total) was completely reduced by ascorbate and partly by NADH and had a midpoint potential of ca 150 mV. At – 196°C, ascorbate reduction revealed a symmetrical α-band at ca 557 nm with PM from spinach leaves, cauliflower and sugar beet leaves, but with barley root and leaf PM ascorbate reduction resulted in an asymmetrical α-band (shoulder at 552, maximum at 559 nm). In the dithionite-reduced minus ascorbate-reduced spectrum at –196°C a split α-band (552 + 558 nm) was seen with PM from all species. This minor component had a midpoint potential of ca – 50 mV and is probably identical to cytochrome b5, the presence of which would explain the relatively high NADH-cytochrome c reductase activities observed with plant PM. With PM from cauliflower, CO-difference spectra indicated that cytochromes P-420 and P-450 were present at concentrations up to 0.06 and 0.03 nmol (mg protein)−1, respectively. Visualization of cytochromes by heme staining after LDS-PAGE was complicated by endogenous peroxidase activity and by loss of heme during solubilisation. A presumptive b-cytochrome (heme-stained band at 94 kDa) was only detected with barley leaf PM.

  • 14.
    Askerlund, Per
    et al.
    Jönköping University, School of Education and Communication, HLK, Disciplinary Research. Department of Plant Physiology, University of Lund, Lund, Sweden.
    Larsson, Christer
    Department of Plant Physiology, University of Lund, Lund, Sweden.
    Widell, Susanne
    Department of Plant Physiology, University of Lund, Lund, Sweden.
    Localization of donor and acceptor sites of NADH dehydrogenase activities using inside-out and right-side-out plasma membrane vesicles from plants1988In: FEBS Letters, ISSN 0014-5793, E-ISSN 1873-3468, Vol. 239, no 1, p. 23-28Article in journal (Refereed)
    Abstract [en]

    Inside-out and right-side-out plasma membrane vesicles from sugar beet (Beta vulgaris L.) leaves, prepared by aqueous two-phase partitioning, were used to localize donor and acceptor sites and to determine substrate affinities for plasma membrane-bound NADH dehydrogenase activities. NADH-ferricyanide and NADH-cytochrome c reductase activities were approx. 30% latent with inside-out vesicles and about 80% latent with right-side-out vesicles, indicating that both donor and acceptor sites for these activities are located on the cytoplasmic surface of the plasma membrane, and that a possible transplasma membrane electron transport would constitute only a minor proportion of the total activity.

  • 15.
    Askerlund, Per
    et al.
    Jönköping University, School of Education and Communication, HLK, Disciplinary Research. Department of Plant Biochemistry, University of Lund, Lund, Sweden.
    Laurent, Pascal
    Laboratoire de Biomembranes Vegetales, Unité de Recherche Associé 1180, Université Pierre et Marie Curie, Paris, France.
    Nakagawa, Hiroki
    Faculty of Horticulture, Chiba University, Matsudo, Chiba, Japan.
    Kader, Jean-Claude
    Laboratoire de Biomembranes Vegetales, Unité de Recherche Associé 1180, Université Pierre et Marie Curie, Paris, France.
    NADH-Ferricyanide Reductase of Leaf Plasma Membranes: Partial Purification and Immunological Relation to Potato Tuber Microsomal NADH-Ferricyanide Reductase and Spinach Leaf NADH-Nitrate Reductase1991In: Plant Physiology, ISSN 0032-0889, E-ISSN 1532-2548, Vol. 95, no 1, p. 6-13Article in journal (Refereed)
    Abstract [en]

    Plasma membranes obtained by two-phase partitioning of microsomal fractions from spinach (Spinacea oleracea L. cv Medania) and sugar beet leaves (Beta vulgaris L.) contained relatively high NADH-ferricyanide reductase and NADH-nitrate reductase (NR; EC 1.6.6.1) activities. Both of these activities were latent. To investigate whether these activities were due to the same enzyme, plasma membrane polypeptides were separated with SDS-PAGE and analyzed with immunoblotting methods. Antibodies raised against microsomal NADH-ferricyanide reductase (tentatively identified as NADH-cytochrome b5 reductase, EC 1.6.2.2), purified from potato (Solanum tuberosum L. cv Bintje) tuber microsomes, displayed one single band at 43 kilodaltons when reacted with spinach plasma membranes, whereas lgG produced against NR from spinach leaves gave a major band at 110 kilodaltons together with a few fainter bands of lower molecular mass. Immunoblotting analysis using inside-out and right-side-out plasma membrane vesicles strongly indicated that NR was not an integral protein but probably trapped inside the plasma membrane vesicles during homogenization. Proteins from spinach plasma membranes were solubilized with the zwitterionic detergent 3-[(3-cholamidopropyl) dimethylammonio] 1-propane-sulfonate and separated on a Mono Q anion exchange column at pH 5.6 with fast protein liquid chromatography. One major peak of NADH-ferricyanide reductase activity was found after separation. The peak fraction was enriched about 70-fold in this activity compared to the plasma membrane. When the peak fractions were analyzed with SDS-PAGE the NADH-ferricyanide reductase activity strongly correlated with a 43 kilodalton polypeptide which reacted with the antibodies against potato microsomal NADH-ferricyanide reductase. Thus, our data indicate that most, if not all, of the truly membrane-bound NADH-ferricyanide reductase activity of leaf plasma membranes is due to an enzyme very similar to potato tuber microsomal NADH-ferricyanide reductase (NADH-cytochrome b5 reductase).

  • 16.
    Askerlund, Per
    et al.
    Jönköping University, School of Education and Communication, HLK, Disciplinary Research.
    Sommarin, M
    Calcium efflux transporters in higher plants1996In: Membranes: Specialized Functions in Plants / [ed] M. Smallwood, Oxford: Bios Scientific Publishers Ltd , 1996, p. 281-299Chapter in book (Refereed)
  • 17.
    Burbano, X.
    et al.
    University of Miami School of Medicine, Division of Disease Prevention, Department of Psychiatry and Behavioral Sciences, Miami, FL, United States.
    Miguez, M. J.
    University of Miami School of Medicine, Division of Disease Prevention, Department of Psychiatry and Behavioral Sciences, Miami, FL, United States.
    Lecusay, Robert
    University of Miami School of Medicine, Division of Disease Prevention, Department of Psychiatry and Behavioral Sciences, Miami, FL, United States.
    Rodriguez, A.
    University of Miami School of Medicine, Department of Medicine, Miami, FL, United States.
    Ruiz, P.
    University of Miami School of Medicine, Department of Medicine, Miami, FL, United States.
    Morales, G.
    University of Miami School of Medicine, Division of Disease Prevention, Department of Psychiatry and Behavioral Sciences, Miami, FL, United States.
    Castillo, G.
    University of Miami School of Medicine, Division of Disease Prevention, Department of Psychiatry and Behavioral Sciences, Miami, FL, United States.
    Baum, M.
    Florida International University, College of Health Dietetics and Nutrition, Miami, FL, United States.
    Shor-Posner, G.
    University of Miami School of Medicine, Division of Disease Prevention, Department of Psychiatry and Behavioral Sciences, Miami, FL, United States.
    Thrombocytopenia in HIV-infected drug users in the HAART era2001In: Platelets, ISSN 0953-7104, E-ISSN 1369-1635, Vol. 12, no 8, p. 456-461Article in journal (Refereed)
    Abstract [en]

    The present case-control study compared 26 HIV+ drug users having persistent thrombocytopenia (TCP< 150 000/mm(3)) with 54 available age, gender and HIV CDC classification matched controls with normal platelet counts. Participants were followed longitudinally over a 2-year period (1998-2000), and hematological alterations evaluated in relationship to antiretroviral treatment, drug use and nutritional (selenium) status. Demographic information and medical history, including antiretroviral treatment were obtained. Blood was drawn for complete cell blood count, T lymphocytes and viral load. Sixty-nine percent of the individuals with persistent TCP and 49% of the controls were receiving antiretrovirals. At baseline, no significant differences in CD4 existed between the two groups. Over time, CD4 cell count declined in the cases (P = 0.05) and a significantly higher proportion of the cases (38%) developed AIDS (CD4< 200 cell/mm(3)), as compared to the controls (18%, P = 0.004). A high risk for development of thrombocytopenia was observed with specific drug use (heroin 2.96 times, P = 0.0007), selenium levels below 145 mug/l (6 times, P = 0.008), and abnormal liver enzyme (SGOT) levels (2 times, P = 0.002). Together, these results indicate a number of factors that may be sensitive predictors of thrombocytopenia, which, despite antiretroviral treatment, appears to be related to more rapid disease progression in drug users.

  • 18.
    Burbano, X.
    et al.
    Division of Disease Prevention, Department of Psychiatry/Behav. Sci., Univ. of Miami School of Medicine, Miami, FL, United States.
    Miguez-Burbano, M. J.
    Division of Disease Prevention, Department of Psychiatry/Behav. Sci., Univ. of Miami School of Medicine, Miami, FL, United States.
    McCollister, K.
    Dept. of Epidemiology/Public Health, Univ. of Miami School of Medicine, Miami, FL, United States.
    Zhang, G.
    Division of Disease Prevention, Department of Psychiatry/Behav. Sci., Univ. of Miami School of Medicine, Miami, FL, United States.
    Rodriguez, A.
    Department of Medicine, Univ. of Miami School of Medicine, Miami, FL, United States.
    Ruiz, P.
    Department of Pathology, Univ. of Miami School of Medicine, Miami, FL, United States.
    Lecusay, Robert
    Division of Disease Prevention, Department of Psychiatry/Behav. Sci., Univ. of Miami School of Medicine, Miami, FL, United States.
    Shor-Posner, G.
    Division of Disease Prevention, Department of Psychiatry/Behav. Sci., Univ. of Miami School of Medicine, Miami, FL, United States.
    Impact of a selenium chemoprevention clinical trial on hospital admissions of HIV-infected participants2002In: HIV Clinical Trials, ISSN 1528-4336, E-ISSN 1945-5771, Vol. 3, no 6, p. 483-491Article in journal (Refereed)
    Abstract [en]

    Purpose: To evaluate the impact of selenium chemoprevention (200 μg/day) on hospitalizations in HIV-positive individuals. Method: Data were obtained from 186 HIV+ men and women participating in a randomized, double-blind, placebo-controlled selenium clinical trial (1998-2000). Supplements were dispensed monthly, and clinical evaluations were conducted every 6 months. Inpatient hospitalizations, hospitalization costs, and rates of hospitalization were determined 2 years before and during the trial. Results: At enrollment, no significant differences in CD4 cell counts or viral burden were observed between the two study arms. Fewer placebo-treated participants were using antiretrovirals (p < .05). The total number of hospitalizations declined from 157 before the trial to 103 during the 2-year study. A marked decrease in total admission rates (RR = 0.38; p =.002) and percent of hospitalizations due to infection/100 patients for those receiving selenium was observed (p = .01). As a result, the cost for hospitalization decreased 58% in the selenium group, compared to a 30% decrease in the placebo group (p = .001). In the final analyses, selenium therapy continued to be a significant independent factor associated with lower risk of hospitalization (p = .001). Conclusion: Selenium supplementation appears to be a beneficial adjuvant treatment to decrease hospitalizations as well as the cost of caring for HIV-1-infected patients.

  • 19.
    Butros, Simon
    et al.
    Jönköping University, School of Education and Communication, HLK, Global Studies. Jönköping University, School of Education and Communication, HLK, School Based Research, Sustainable Development and Science education.
    Lager, Tim
    Jönköping University, School of Education and Communication, HLK, Global Studies. Jönköping University, School of Education and Communication, HLK, School Based Research, Sustainable Development and Science education.
    Plussummespela hela vägen till hållbar utveckling – En studie om ”Europas grönaste stad”: Hur Internationella samarbeten driver hållbar utveckling framåt i staden. 2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The environmental threat is a stressing concern which must be addressed immediately. The urbanization has been growing in a rapid pace the past years. Today, more than 50 percent of the world’s population lives in cities, and the forecast tells us that it will increase to 70 percent in 2050. This puts pressure on actors like states, organizations, companies, and municipalities who must work to meet the urbanization immediately. The UN, the EU and WWF amongst others advocates that international cooperation between these actors is the best way to go, and that cities must be prepared for the problem that occurs today and the challenges for tomorrow. In spite of this, there is no substantial research on this topic, on what international environmental cooperation between cities could mean to a city or what the results could be. Växjö is one of few Swedish cities who work internationally with local as well as global ecological sustainable development. This study intends to discover the international cooperations in the topic of environmental sustainable development in the city in Växjö. The purpose is to see what impact the international cooperations have in the environmental work of Växjö, and to see whether environmental sustainable development is being urged on by international collaborations. By using a positive–sum game as a theoretical starting point, a case–study has been conducted, where interviews were made with representatives from Växjö municipal. The result of the study shows that the effects Växjö has obtained through these cooperations, do promote environmental sustainable development. If the collaborations take the form of a positive–sum game, all actors benefit from it and the environment as well. Since the international cooperations bring exchange of knowledge and sometimes external financial means to put into different projects, the city’s environmental sustainable development improves.

  • 20.
    Carlsson, Emma
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Natural Science and Biomedicine. Jönköping University, School of Health and Welfare, HHJ. Biomedical Platform.
    The importance of psychological and physical stressors on diabetes-related immunity in a young population – an interdisciplinary approach2016Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Background: The prevalence of immunological disorders such as type 1 diabetes (T1D) is increasingly common amongst children, adolescents and young adults. There is also an increase in psychosomatic symptoms (depression, insomnia, anxiety, headaches and fatigue etc.) as well as a decrease in physical activity amongst young people, affecting the well-being and overall health of our younger population. It is therefore important to study the effects of psychological and physical stressors on the immune system, to evaluate their impact on juvenile health.

    Aim: This thesis explores the impact of psychological and physical stressors on the cellular immune system with special focus on diabetes-related immunity in a young population, using an interdisciplinary approach.

    Method: When exploring the impact of psychological and physical stressors such as psychological stress due to exposure to psychological stressful experiences or degree of physical activity/training on the cellular immune system in children, adolescents and young women, peripheral blood mononuclear cells (PBMC) were stimulated with antigens (tetanus toxoid (TT) and β-lactoglobulin (βLG)) as well as diabetes-related autoantigens (insulin, heat shock protein 60 (HSP60), tyrosine phosphatase-2 (IA-2) and glutamic acid decarboxylase 65 (GAD65)) and secreted cytokines and chemokines were measured by multiplex fluorochrome technique (Luminex). Populations of Thelper (Th) cells (CD4+), T-cytotoxic (Tc) cells (CD8+), B cells (CD19+), Natural Killer (NK) cells (CD56+CD16+) as well as regulatory T (Treg) cells (CD4+CD25+FoxP3+CD127-), and their expression of CD39 and CD45RA were studied by flow cytometry. Diabetes-related parameters (glucose, C-peptide,proinsulin, pancreatic polypeptide and peptide YY) were measured to studyβ-cell activity and appetite regulation and cortisol was used as a biological marker for psychological and physical stress.

    Results: Children in families exposed to psychological stress showed an imbalanced cellular immune response as well as an increased immune response towards diabetes-related autoantigens. Also, previous exposure to psychological stress as well as current exposure to psychological stress in young women showed an increased immune response towards diabetes-related autoantigens. Further, previous exposure to psychological stress in young women showed increased numbers of circulating CD56+CD16+ NK cells as wellas decreased numbers of circulating CD4+CD25+FoxP3+CD127- Treg cells. High physical activity in children showed decreased spontaneous immune response as well as a decreased immune response towards diabetes-related autoantigens, while low physical activity in children showed an increased immune response towards diabetes-related autoantigens. Further, endurance training in adolescents, especially in adolescent males and young adolescents, showed an increased immune response towards the diabetes-related autoantigen IA-2.

    Conclusion: It is evident that psychological and physical stressors such as exposure to psychological stress and degree of physical activity/training impact the cellular immune system. Experiences associated with psychological stress seem to have a negative effect on the cellular immune system in a young population, causing an imbalance in the immune system that could possibly induce diabetes-related immunity. High physical activity in children seems to have a protective effect against diabetes-related immunity. In contrast, low physical activity in children and endurance training in adolescents seems to induce diabetes-related immunity. It is very likely that psychological stressful experiences, low physical activity and intense training such as endurance training all play important roles in the immunological process leading to the development of type 1 diabetes.

  • 21.
    Carlsson, Emma
    et al.
    Jönköping University, School of Health and Welfare, HHJ. Biomedical Platform. Jönköping University, School of Health and Welfare, HHJ, Dep. of Natural Science and Biomedicine.
    Frostell, Anneli
    Division of Medical Diagnostics, Ryhov County Hospital, Jönköping, Sweden.
    Ludvigsson, Johnny
    Division of Paediatrics and Diabetes Research Centre, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Linköping, Sweden.
    Faresjö, Maria
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Natural Science and Biomedicine. Jönköping University, School of Health and Welfare, HHJ. Biomedical Platform.
    Psychological Stress in Children May Alter the Immune Response2014In: Journal of Immunology, ISSN 0022-1767, E-ISSN 1550-6606, Vol. 192, no 5, p. 2071-2081Article in journal (Refereed)
    Abstract [en]

    Psychological stress is a public health issue even in children and has been associated with a number of immunological diseases. The aim of this study was to examine the relationship between psychological stress and immune response in healthy children, with special focus on autoimmunity. In this study, psychological stress was based on a composite measure of stress in the family across the domains: 1) serious life events, 2) parenting stress, 3) lack of social support, and 4) parental worries. PBMCs, collected from 5-y-old high-stressed children (n = 26) and from 5-y-old children without high stress within the family (n = 52), from the All Babies In Southeast Sweden cohort, were stimulated with Ags (tetanus toxoid and β-lactoglobulin) and diabetes-related autoantigens (glutamic acid decarboxylase 65, insulin, heat shock protein 60, and tyrosine phosphatase). Immune markers (cytokines and chemokines), clinical parameters (C-peptide, proinsulin, glucose), and cortisol, as an indicator of stress, were analyzed. Children from families with high psychological stress showed a low spontaneous immune activity (IL-5, IL-10, IL-13, IL-17, CCL2, CCL3, and CXCL10; p < 0.01) but an increased immune response to tetanus toxoid, β-lactoglobulin, and the autoantigens glutamic acid decarboxylase 65, heat shock protein 60, and tyrosine phosphatase (IL-5, IL-6, IL-10, IL-13, IL-17, IFN-γ, TNF-α, CCL2, CCL3, and CXCL10; p < 0.05). Children within the high-stress group showed high level of cortisol, but low level of C-peptide, compared with the control group (p < 0.05). This supports the hypothesis that psychological stress may contribute to an imbalance in the immune response but also to a pathological effect on the insulin-producing β cells.

  • 22.
    Carlsson, Emma
    et al.
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Natural Science and Biomedicine.
    Magnusson, Anette
    Tompa, Andrea
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Natural Science and Biomedicine.
    Bülow, Per
    Gerdner, Arne
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Behavioural Science and Social Work. Jönköping University, School of Health and Welfare, HHJ. Research Platform of Social Work.
    Faresjö, Maria
    Psychological stress affects the numbers of circulating CD56+CD16+ and CD4+CD25+FoxP3+CD127- cells and induce an immune response towards type 1 diabetes-related autoantigens in young women2016Article in journal (Other academic)
  • 23.
    Carlsson, Emma
    et al.
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Natural Science and Biomedicine.
    Rundkvist, Louise
    Blomstrand, Peter
    Faresjö, Maria
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Natural Science and Biomedicine.
    Endurance training during adolescence induces a pro-inflammatory response directed towards the diabetes-related autoantigen tyrosine phosphatase-2Manuscript (preprint) (Other academic)
  • 24.
    During, Heinjo J.
    et al.
    Utrecht University.
    Verduyn, Betty
    Utrecht University.
    Jägerbrand, Annika K.
    Statens väg- och transportforskningsinstitut, Miljö, MILJÖ.
    Biomechanical properties of the terrestrial mosses Pleurozium schreberi (Brid.) Mitt. and Pogonatum japonicum Sull. & Lesq. along altitudinal gradients in northern Japan2015In: Arctoa: A Journal of Briology, ISSN 0131-1379, Vol. 24, p. 375-381Article in journal (Refereed)
    Abstract [en]

    Altitudinal gradients along mountain slopes provide valuable opportunities to study variation in plant traits in response to changes in environmental conditions along such  gradients. This study focused on biomechanical traits of two moss species, the more or less horizontally growing Pleurozium schreberi and the erect-growing Pogonatum japonicum, along altitudinal gradients on two mountains in Hokkaido, northern Japan.

    We measured stem diameter in two directions to determine the second moment of area I, used three-point bending tests with free stem ends to determine the slope of the force-deflection curve dF/dx, and used these data to calculate Young’s modulus and flexural rigidity of the stems. Both species showed much variation in all traits among replicates in the samples at each altitude. Environmental variation associated with altitude had more effect on the biomechanical traits of P. japonicum than on those of P. schreberi. Stems of P. japonicum were thicker (larger I) than those of P. schreberi and had a larger Young’s modulus and flexural rigidity. Stems tended to become thinner (lower second moment of area) and less rigid (lower flexural rigidity) at increasing altitude in both species.

  • 25.
    Ekane, Nelson
    et al.
    Royal Institute of Technology (KTH) and Stockholm Environment Institute (SEI), Stockholm, Sweden.
    Mertz, C. K.
    Decision Research (DR), Eugene, Oregon, USA.
    Slovic, Paul
    Decision Research (DR) and University of Oregon, Eugene, Oregon, USA.
    Kjellén, Marianne
    Stockholm International Water Institute (SIWI).
    Westlund, Hans
    Jönköping University, Jönköping International Business School, JIBS, Economics. Royal Institute of Technology (KTH), Stockholm, Sweden.
    Risk and benefit judgment of excreta as fertilizer in agriculture: An exploratory investigation in Rwanda and Uganda2016In: Human and Ecological Risk Assessment, ISSN 1080-7039, E-ISSN 1549-7860, Vol. 22, no 3, p. 639-666Article in journal (Refereed)
    Abstract [en]

    This research explores the use of psychometric techniques to improve understanding of psychological mechanisms underlying judgment of excreta as fertilizer in agriculture including other excreta related activities. Participants consisted of environmental health students, smallholder farmers and traders in rural and urban Rwanda and Uganda. The finding reveals an inverse relationship between risk and benefit judgments. This relationship holds for the three groups of participants with significant risk-benefit correlations of p<.0001. This finding is consistent with other studies showing that affect plays a key role in risk perception, judgment and decision making.

    Building on this finding, we conclude that individuals with high risk and low benefit judgment for excreta related practices would eschew them or emphasize strict standards. Individuals with a high benefit and low risk judgment would engage in excreta management practices regardless of the actual risks involved. This finding is relevant for risk communication and risk management as it indicates that individuals do not rely only on risk management information they receive concerning excreta and related risks but also depend to an extent on their feelings about these substances when making judgments and decisions regarding the purpose for using excreta as fertilizer and the level of exposure they can tolerate and manage.

  • 26.
    Eriksson, Sören
    Jönköping University, Jönköping International Business School, JIBS, Economics.
    Snakebites in a rural area in northern Vietnam: a southeast Asian context2008In: Herpetological Bulletin, ISSN 1473-0928, Vol. 104, p. 13-21Article in journal (Refereed)
  • 27.
    Forsmark, Annabelle
    et al.
    Department of Cell and Molecular Biology, Microbiology, University of Gothenburg, Gothenburg, Sweden.
    Rossi, Guendalina
    Department of Cell and Developmental Biology, University of North Carolina School of Medicine, Chapel Hill, NC, USA.
    Wadskog, Ingrid
    Jönköping University, School of Engineering, JTH, Chemical Engineering.
    Brennwald, Patrick
    Department of Cell and Developmental Biology, University of North Carolina School of Medicine, Chapel Hill, NC, USA.
    Warringer, Jonas
    Department of Cell and Molecular Biology, Microbiology, University of Gothenburg, Gothenburg, Sweden.
    Adler, Lennart
    Department of Cell and Molecular Biology, Microbiology, University of Gothenburg, Gothenburg, Sweden.
    Quantitative Proteomics of Yeast Post-Golgi Vesicles Reveals a Discriminating Role for Sro7p in Protein Secretion2011In: Traffic: the International Journal of Intracellular Transport, ISSN 1398-9219, E-ISSN 1600-0854, Vol. 12, no 6, p. 740-753Article in journal (Refereed)
    Abstract [en]

    We here report the first comparative proteomics of purified yeast post-Golgi vesicles (PGVs). Vesicle samples isolated from PGV-accumulating sec6-4 mutants were treated with isobaric tags (iTRAQ) for subsequent quantitative tandem mass spectrometric analysis of protein content. After background subtraction, a total of 66 vesicle-associated proteins were identified, including known or assumed vesicle residents as well as a fraction not previously known to be PGV associated. Vesicles isolated from cells lacking the polarity protein Sro7p contained essentially the same catalogue of proteins but showed a reduced content of a subset of cargo proteins, in agreement with a previously shown selective role for Sro7p in cargo sorting.

  • 28.
    Fredlund, Kenneth M.
    et al.
    Department of Plant Biology, Lund University, Lund, Sweden.
    Struglics, André
    Department of Plant Biology, Lund University, Lund, Sweden.
    Widell, Susanne
    Department of Plant Biology, Lund University, Lund, Sweden.
    Askerlund, Per
    Jönköping University, School of Education and Communication, HLK, Disciplinary Research. Department of Plant Biochemistry, Lund University, Lund, Sweden.
    Kader, Jean-Claude
    Laboratorie de Physiologie Cellulaire, Paris, France.
    Møller, Ian M.
    Department of Plant Biology, Lund University, Lund, Sweden.
    Comparison of the Stereospecificity and Immunoreactivity of NADH-Ferricyanide Reductases in Plant Membranes1994In: Plant Physiology, ISSN 0032-0889, E-ISSN 1532-2548, Vol. 106, no 3, p. 1103-1106Article in journal (Refereed)
    Abstract [en]

    The substrate stereospecificity of NADH-ferricyanide reductase activities in the inner mitochondrial membrane and peroxisomal membrane of potato (Solanum tuberosum L.) tubers, spinach (Spinacea oleracea L.) leaf plasma membrane, and red beetroot (Beta vulgaris L.) tonoplast were all specific for the [beta]-hydrogen of NADH, whereas the reductases in wheat root (Triticum aestivum L.) endoplasmic reticulum and potato tuber outer mitochondrial membrane were both [alpha]-hydrogen specific. In all isolated membrane fractions one or several polypeptides with an apparent size of 45 to 55 kD cross-reacted with antibodies raised against a microsomal NADH-ferricyanide reductase on western blots.

  • 29.
    Frisk, Johanna
    Jönköping University, School of Health and Welfare, HHJ, Dep. of Natural Science and Biomedicine.
    Utvärdering av resistensbestämning med diskdiffusionstest från selektiva agarmedier för MRSA, ESBL och VRE i jämförelse med från blodagar2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Multiresistant bacteria such as methicillin-resistant Staphylococcus aureus (MRSA), extended-spectrum beta-lactamase (ESBL) producing bacteria and vancomycin-resistant enterococci (VRE) have been a problem for decades with an increasing rate. Today, at mikrobiologen, Unilabs Skövde, bacterial strains are isolated from selective media for MRSA, ESBL and VRE onto blood agar before the susceptibility testing. The aim of the study was to examine the possibility of disk diffusion susceptibility testing directly from the selective media and thus be able to reply the findings earlier. The zones of inhibition were examined for a total of 64 isolates after disk diffusion testing from both the selective and blood agar plates in order to evaluate if the zone sizes were affected. The results showed what was considered a normal variation of ±2 mm for all pairwise zones except for a difference in 3 mm. The majority of all zones tested for MRSA, ESBL and VRE had equally large zones, 62%, 89% and 98% respectively. Based on the good results, the material was considered enough to make the conclusion that the method is feasible. Considering the positive effects of making susceptibility testing directly from selective agar, a change to this method is recommended to mikrobiologen, Unilabs Skövde.

  • 30.
    Gabrielsson, Lovisa
    et al.
    Jönköping University, School of Health Science, HHJ, Dep. of Natural Science and Biomedicine.
    Nilsson, Kristoffer
    Jönköping University, School of Health Science, HHJ, Dep. of Natural Science and Biomedicine.
    Detektion av Trichomonas vaginalis samt Mycoplasma genitalium med multiplex realtids-PCR: En prevalensstudie i Jönköpings län2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The request for detection of Trichomonas vaginalis and Mycoplasma genitalium in Jönköping County is low compared to Chlamydia trachomatis and Neisseria gonorrhoeae. Both T. vaginalis and M. genitalium have been associated with Human Papilloma Virus (HPV) infection and can cause infections such as salpingitis, potentially resulting in infertility. The pathogens have also been described to increase the risk of HIV transmission. The aim of this study was to detect T. vaginalis and M. genitalium by real-time Polymerase Chain Reaction (PCR) to estimate the prevalence among individuals tested for C. trachomatis, N. gonorrhoeae and HPV in Jönköping County. In individuals above the age of 25 years, tested for C. trachomatis and N. gonorrhoeae, the prevalence was estimated to 5,5 % for M. genitalium and 0,13 % for T. vaginalis. In the same group the prevalence of C. trachomatis and N. gonorrhoeae was 4,5 % and 0,13 % respectively. The prevalence in individuals tested for HPV was estimated to 2,3 % for M. genitalium and 0,26 % for T. vaginalis. Relevance of a more frequent request for detection of M. genitalium was concluded and single pathogen detection was not deemed to be optimal. Multiplex analysis for detection of sexually transmitted pathogens is encouraged.

  • 31.
    Ghazimirsaid, Shabnam
    Jönköping University, School of Health Science, HHJ, Dep. of Natural Science and Biomedicine.
    Torrluftsprovokation vid diagnostik av bronkiell hyperreaktivitet: - Jämförelse mellan två olika provokationsvolymer2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Asthma is one of the most widespread diseases in Sweden today treated with modern drugs. The objective is to improve patient's quality of life. This requires an accurate and early diag-nosis. A dry air provocation can be a great study option in asthma investigation.Patients inhale dry air by quick and deep breath for about 4 minutes. The balloon should be-come completely emptied; this is not easy and is therefore considered as a disadvantage of this method because patients may not get enough provoked.The study aims to compare high (FEV1 x 24) and low (FEV1 x 12) provocation volumes in dry air provocation that affect the outcome of increased airway resistance measured bydynamic spirometry and Impulse oscillometry.Upon examination of the 10 volunteers, healthy individuals between 20-45 years without known bronchial hyperreactivity, there was no difference in airway reaction of dry air provo-cation with low and high volume provocation.This could mean that provocation volume does not matter so much for the outcome, but we examined only a small group of healthy subjects with no known bronchial hyperreactivity.In order to reliably verify the results, a similar study needs to be done on patients with known bronchial hyperreactivity.

  • 32.
    Goodkin, K.
    et al.
    Dept. of Psychiat./Behav. Sciences, Univ. of Miami School of Medicine, Miami, FL, United States.
    Heckman, T.
    Department of Psychology, Ohio University, Athens, OH, United States.
    Siegel, K.
    School of Public Health, Columbia University, New York, NY, United States.
    Linsk, M.
    Jane Adams School of Social Work, University of Illinois, Chicago, IL, United States.
    Khamis, I.
    Dept. of Psychiat./Behav. Sciences, Univ. of Miami School of Medicine, Miami, FL, United States.
    Lee, D.
    Dept. of Psychiat./Behav. Sciences, Univ. of Miami School of Medicine, Miami, FL, United States.
    Lecusay, Robert
    Dept. of Psychiat./Behav. Sciences, Univ. of Miami School of Medicine, Miami, FL, United States.
    Poindexter, C. C.
    Jane Adams School of Social Work, University of Illinois, Chicago, IL, United States.
    Mason, S. J.
    Jane Adams School of Social Work, University of Illinois, Chicago, IL, United States.
    Suarez, P.
    Dept. of Psychiat./Behav. Sciences, Univ. of Miami School of Medicine, Miami, FL, United States.
    Eisdorfer, C.
    Dept. of Psychiat./Behav. Sciences, Univ. of Miami School of Medicine, Miami, FL, United States.
    "Putting a face" on HIV infection/AIDS in older adults: A psychosocial context2003In: Journal of Acquired Immune Deficiency Syndromes, ISSN 1525-4135, E-ISSN 1944-7884, Vol. 33, p. S171-S184Article, review/survey (Refereed)
    Abstract [en]

    Older HIV-1-seropositive individuals largely have not been investigated with respect to their psychosocial characteristics. In this article, the authors review research reported to date regarding the psychosocial context of this growing subgroup of HIV-1-infected individuals. Specifically, the authors consider the characteristics of mood state, life stressor burden, social support network, and coping strategies that individuals older than 50 years are more likely to adopt in adjusting to HIV-1 infection. The authors also separately consider issues of caregiving burden. Data supporting a theoretically based stressor-support-coping model are presented and related to targeting psychotherapeutic interventions for this age group.

  • 33.
    Gren, Ing-Marie
    et al.
    Sveriges Lantbruksuniversitet.
    Häggmark-Svensson, Tobias
    Sveriges Lantbruksuniversitet.
    Andersson, Hans
    Sveriges Lantbruksuniversitet.
    Jansson, Gunnar
    Sveriges Lantbruksuniversitet.
    Jägerbrand, Annika
    Statens väg- och transportforskningsinstitut, Miljö, MILJÖ.
    Using traffic data to estimate wildlife populations2015In: Journal of Bioeconomics, ISSN 1387-6996, E-ISSN 1573-6989, Vol. 18, no 1, p. 17-31Article in journal (Refereed)
    Abstract [en]

    Wildlife populations are threatened worldwide by, among others, habitat fragmentation and hunting pressure. An important impediment for the large scale, national and regional, management of the populations is the difficulty to quantify population dynamics. The purpose of this study is to present a tool for such estimations which is based on available data in several countries; traffic load and traffic accidents with wildlife. An econometric model is developed, which accounts for landscape characteristics. It is applied to wild boar in Sweden, for which data on traffic load and accidents for different counties and years are available. Landscape characteristics are introduced with direct or indirect effects on population growth. The indirect landscape model gives the best statistical performance, and the results show relatively small differences in calculated intrinsic growth rate among counties but considerable differences in predicted population developments.

  • 34.
    Holmén, Jonathan
    et al.
    Högskolan i Skövde, Forskningscentrum för Systembiologi.
    Jansson, Andreas
    Högskolan i Skövde, Forskningscentrum för Systembiologi.
    Larsson, Dennis
    Högskolan i Skövde, Forskningscentrum för Systembiologi.
    A Kinetic Overview of the Receptors Involved in 1,25-Dihydroxyvitamin D3 and 24,25-Dihydroxyvitamin D3 Signaling: A Systems Biology Approach2009In: Critical Reviews in Eukaryotic Gene Expression, ISSN 1045-4403, E-ISSN 2162-6502, Vol. 19, no 3, p. 181-196Article, review/survey (Refereed)
    Abstract [en]

    The vitamin D endocrine system modulates an arsenal of important biological functions in more than 30 different tissues in short- and long-term perspectives. Two membrane receptors and one nuclear receptor are suggested to be involved in the vitamin D signaling system, but the function and physiological relevance of the receptors are debated. The complexity of the vitamin D endocrine system makes it necessary to combine experimental data with in silico simulations to get a holistic view of vitamin D-dependent regulation of tissue and cell physiology. This review focus on binding characteristics for the three putative vitamin D receptors and proposes a future systems biology approach including mathematical modeling that will be helpful together with experimental methods in depicting antitumoral and other biological effects promoted by the vitamin D endocrine system.

  • 35.
    Johansson, Matilda
    et al.
    Jönköping University, School of Education and Communication.
    Hansen, Åsa
    Jönköping University, School of Education and Communication.
    Biologiundervisning utomhus: En studie av utomhusundervisningen inom biologiämnet i grundskolans senare år.2008Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    The purpose of this work is to study outdoor education in biology, in the later years of compulsory school, and to investigate the role of “Ekobussen” in outdoor education. The questions at issue runs:

    •What do teachers think about outdoor education in biology?

    •What benefits and disadvantages are there with outdoor education?

    •What do the pupils gain by outdoor education?

    •What are the attitudes of “Ekobussen” by teachers and how do they use it in their work?

    To answer these questions we handed out a questionnaire to both teachers and pupils, and we also interviewed three teachers.

    The result of the investigation shows that both teachers and pupils believe that they are not having enough outdoor education in biology. The causes of this are among other things; unsure teachers, no good outdoor areas to examine in the immediate surroundings of the school and lack of time.

    The investigation shows that the greatest advantages of outdoor education in biology are that the pupils feel that they can connect theoretical- and practical knowledge and that many senses are stimulated which facilitates learning.

  • 36.
    Johansson, Sverker
    Jönköping University, School of Education and Communication, HLK, Disciplinary Research.
    Origins of language: Constraints on hypotheses2005Book (Other academic)
    Abstract [en]

    Sverker Johansson has written an unusual book on language origins, with its emphasis on empirical evidence rather than theory-building. This is a book for the student or researcher who prefers solid data and well-supported conclusions, over speculative scenarios. Much that has been written on the origins of language is characterized by hypothesizing largely unconstrained by evidence. But empirical data do exist, and the purpose of this book is to integrate and review the available evidence from all relevant disciplines, not only linguistics but also, e.g., neurology, primatology, paleoanthropology, and evolutionary biology. The evidence is then used to constrain the multitude of scenarios for language origins, demonstrating that many popular hypotheses are untenable. Among the issues covered: (1) Human evolutionary history, (2) Anatomical prerequisites for language, (3) Animal communication and ape "language", (4) Mind and language, (5) The role of gesture, (6) Innateness, (7) Selective advantage of language, (8) Proto-language.

  • 37.
    Johansson, Sverker
    Jönköping University, School of Education and Communication, HLK, School Based Research, Media, Literature and Language Didactics.
    What constraints does animal communication place on human language origins?2010Conference paper (Other academic)
  • 38. Jonsdottir, I.S.
    et al.
    Crittenden, P.
    Jägerbrand, Annika K.
    Göteborg University.
    Measuring growth rates in bryophytes and lichens1997In: Summary document of 8th Annual ITEX Workshop. Royal Holloway Institute for Environmental Research, 19-22 April, 1997, 1997Conference paper (Other academic)
  • 39.
    Jägerbrand, Annika
    et al.
    Statens väg- och transportforskningsinstitut, Miljö, MILJÖ.
    Alatalo, Juha M.
    Uppsala Universitet.
    Kudo, Gaku
    Hokkaido University.
    Variation in responses to temperature treatments ex situ of the moss Pleurozium schreberi (Willd. ex Brid.) Mitt.originating from eight altitude sites in Hokkaido, Japan2014In: Journal of Bryology, ISSN 0373-6687, E-ISSN 1743-2820, Vol. 36, no 3, p. 209-216Article in journal (Refereed)
    Abstract [en]

    Thermal acclimatisations are important for the survival and growth of individuals and populations but seldom studied for different populations of bryophytes. The aims of this study were to (I) investigate if responses to temperature treatments were independent of the site sampled or if the intra- and interpopulation variation in responses were larger than the responses to the temperature treatments (control, press, and pulse), and to (II) examine if experimental responses varied, depending on the sampled sites.

    We collected samples of the circumpolar bryophyte species, Pleurozium schreberi (Willd. ex Brid.) Mitt., originating from eight altitude sites on Mt. Oakan in Hokkaido, Japan, and exposed them to three different temperature treatments ex situ for four weeks. Thermal acclimatisation was estimated by measuring responses in growth length increase, biomass increase, number of branches, and the maximum quantum yield of PS II (Fv/Fm). We found that responses to temperature treatments were dependent of the site sampled, and that differences were most pronounced in the length increase. Results also shows that the responses to experimental treatments may differ between sites. Our results therefore raise important concerns regarding the general validity of both ex situ and in situ experiments when performed on a single or a limited number of sites.

  • 40.
    Jägerbrand, Annika K.
    Statens väg- och transportforskningsinstitut, Miljö, MILJÖ.
    Dead or alive? Testing the use of C:N ratios and chlorophyll fluorescence in vertical shoot profiles to determine depth of vitality and point of senescence in populations of bryophytes2015In: Lindbergia, ISSN 0105-0761, E-ISSN 2001-5909, Vol. 38, p. 4-13Article in journal (Refereed)
    Abstract [en]

    Bryophytes with indeterminate growth rarely exhibit clearly identifiable modules or age segments, but can be vertically divided into different physiologically active zones, since physiological activity normally declines vertically along the shoot profile depth. The aim of this study was to investigate whether it is possible to use C:N ratios (C/N)and/or parameters from chlorophyll fluorescence measurements (e.g. Fv/Fm, Fm or qN)to determine if bryophyte tissue is alive, senescent or dead, and at what distance along the shoot segment profile the moss tissue cease to live. Variation in C:N ratios and chlorophyll fluorescence between sites was also examined. This study shows that it is possible to separate alive, senescing and dead parts of the moss shoots in Pleurozium schreberi, and that chlorophyll fluorescence is a good method to use, whereas C/N varies between sites and species (for Hylcomium splendens and Racomitrium lanuginosum)and does not seem to reflect physiological activity to the same degree.

  • 41.
    Jägerbrand, Annika K.
    Jönköping University, School of Engineering, JTH, Civil Engineering and Lighting Science.
    Effects of LED lighting on animals and in the natural environment and recommendations to minimize the impact2019In: Proceedings of the 8th Professional Lighting Design Convention, Rotterdam, the Netherlands, 23-26 October 2019, 2019, p. 98-99Conference paper (Refereed)
  • 42.
    Jägerbrand, Annika K.
    Statens väg- och transportforskningsinstitut, Miljö, MILJÖ.
    LED och ekologiska effekter2015In: Ceebel Nyhetsbrev, Vol. 1, p. 1-3Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    LED har olika typer av ekologisk påverkan och kan i vissa fall leda till större effekter än traditionellt använd belysning. Samtidigt har LED potential att kunna utvecklas till en ekologisk neutral belysning. Det finns en rad olika saker man kan tänka på vid inköp av LED-lampor för att minimera ekologisk påverkan, såsom låg effektnivå, använda dimringsteknik, undvika oönskad ljusspridning och att försöka undvika lampor som har höga nivåer av våglängder under 500 nm.

  • 43.
    Jägerbrand, Annika K.
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science. Calluna AB, Linköping.
    LED-belysningens effekter på djur och natur med rekommendationer: Fokus på nordiska förhållanden och känsliga arter och grupper2018Report (Other academic)
  • 44.
    Jägerbrand, Annika K.
    Jönköping University, School of Engineering, JTH, Civil Engineering and Lighting Science.
    Level of knowledge of sustainable development (SD) in the master’s program Sustainable Building Information Management (BIM)Manuscript (preprint) (Other academic)
    Abstract [en]

    Sustainable development (SD) is essential to reduce and mitigate climate change impacts, environmental deterioration and to increase social sustainability. SD is therefore highly relevant for the engineering profession and is today found integrated with the higher education of specific engineering programs. This paper investigated the knowledge of SD for students entering the master’s program in Sustainable Building Information Management (BIM) by comparing levels of knowledge at the start and end of the first course Sustainability, Analyses and Simulations. The level of knowledge of SD was analyzed by classifying students’ conceptions of sustainability using SOLO taxonomy and the spectrum of liminality and the threshold concept. Students written responses to the question “What do you know about sustainability?” and written group project reports were used for analyzing levels of knowledge of SD. Levels of knowledge of SD was classified as pre (pre-liminal or pre-structural); uni-structural, multi-structural, relational and post-stages (extended abstract or post-liminal). In total, 68% of the students entering the master’s program in 2017 and 88% in 2018 showed a pre-structural, uni-structural and multi-structural SD knowledge. In general, few students entering the program showed relational and post-stages of SD knowledge, 32% and 12% of the students in 2017 and 2018, respectively. The students at the post-stage were able to express themselves more individually and creatively compared to previous levels in that they could connect the dimensions of SD to the context of SD of buildings, but also argue why SD of buildings was important and they could also suggest actions or tools for improved SD that engineers should use. Only one group of five (in 2017) showed a post-stage level of knowledge in the group project report. It is likely that the student’s general approach to the work with the reports was to mainly cope with the course requirements which is a sign of surface approach to learning. It, therefore, seems reasonable that future developments of the course should ensure that the students use the scientific literature in their group project reports to make it easier for them to understand the relationship between software use and the connection to green buildings certificate systems and SD of buildings. By making it mandatory to include scientific literature in the reports the students will be encouraged to read and think critically, and deeper, and to put the practical implementation of the software analysis results into a scientific context of SD and BIM.

  • 45.
    Jägerbrand, Annika K.
    Botanical Institute, Göteborg University, Göteborg, Sweden .
    Patterns of species richness and vegetative performance in heath ecosystems at Thingvellir, Southwest Iceland2004In: Icelandic Agricultural Sciences, ISSN 1670-567X, Vol. 16-17, p. 29-38Article in journal (Refereed)
    Abstract [en]

    The Racomitrium lanuginosum (Hedw.) Brid. moss heath is a unique environment and is of great importance for co-occurring established vascular plants. A thick moss carpet can prevent or restrict the growth of vascular plants as they are exposed to more unfavourable growth conditions, but the effect on species richness and abundance is less known. To investigate the negative effects of a well-developed moss carpet on established vascular plants, patterns of species richness, shoot density, and number of leaves (Carex bigelowii Schwein. and Thalictrum alpinum L.) were studied in two different vegetation types, Racomitrium lanuginosum moss heath, and dwarf shrub heath in Þingvellir National Park, Southwest Iceland.

    Species richness was higher in dwarf shrub heath and increased proportionally with the size of the shrub patches. Total species richness and plant functional dominance did not differ between vegetation types. There were no differences found in shoot density, percentage of flowering and juveniles, number of leaves in Carex bigelowii, or shoot density, flowering percentage or number of leaves in Thalictrum alpinum between the vegetation types. However, leaf length of Carex bigelowii was higher in the dwarf shrubs heath, indicating more favourable growth conditions, shade or shelter effects. It is possible that translocation is taking place between the shoots of the clonal vascular plants in this study so that the plants themselves are counteracting unfavourable effects in the different vegetation types. The effect of global climatic change on moss heaths in Iceland is briefly discussed.

  • 46. Jägerbrand, Annika K.
    et al.
    Alatalo, Juha M.
    Uppsala universitet, Växtekologi och evolution.
    Effects of human trampling on abundance and diversity of vascular plants, bryophytes and lichens in alpine heath vegetation, Northern Sweden2015In: Springer Series in Chemical Physics, ISSN 0172-6218, E-ISSN 2193-1801, Vol. 4, article id 95Article in journal (Refereed)
    Abstract [en]

    This study investigated the effects of human trampling on cover, diversity and species richness in an alpine heath ecosystem in northern Sweden. We tested the hypothesis that proximity to trails decreases plant cover, diversity and species richness of the canopy and the understory. We found a significant decrease in plant cover with proximity to the trail for the understory, but not for the canopy level, and significant decreases in the abundance of deciduous shrubs in the canopy layer and lichens in the understory. Proximity also had a significant negative impact on species richness of lichens. However, there were no significant changes in species richness, diversity or evenness of distribution in the canopy or understory with proximity to the trail. While not significant, liverworts, acrocarpous and pleurocarpous bryophytes tended to have contrasting abundance patterns with differing proximity to the trail, indicating that trampling may cause shifts in dominance hierarchies of different groups of bryophytes. Due to the decrease in understory cover, the abundance of litter, rock and soil increased with proximity to the trail. These results demonstrate that low-frequency human trampling in alpine heaths over long periods can have major negative impacts on lichen abundance and species richness. To our knowledge, this is the first study to demonstrate that trampling can decrease species richness of lichens. It emphasises the importance of including species-level data on non-vascular plants when conducting studies in alpine or tundra ecosystems, since they often make up the majority of species and play a significant role in ecosystem functioning and response in many of these extreme environments.

  • 47.
    Jägerbrand, Annika K.
    et al.
    Statens väg- och transportforskningsinstitut, Miljö, MILJÖ.
    Alatalo, Juha M.
    Campus Gotland, Uppsala Universitet.
    Native roadside vegetation that enances soil erosion control in boreal Scandinavia2014In: Environments, ISSN 2076-3298, Vol. 1, p. 31-41Article in journal (Refereed)
    Abstract [en]

    This study focused on identifying vegetation characteristics associated with erosion control at nine roadside sites in mid-West Sweden. A number of vegetation characteristics such as cover, diversity, plant functional type, biomass and plant community structure were included. Significant difference in cover between eroded and non-eroded sub-sites was found in evergreen shrubs, total cover, and total above ground biomass. Thus, our results support the use of shrubs in order to stabilize vegetation and minimize erosion along roadsides. However, shrubs are disfavored by several natural and human imposed factors. This could have several impacts on the long-term management of roadsides in boreal regions. By both choosing and applying active management that supports native evergreen shrubs in boreal regions, several positive effects could be achieved along roadsides, such as lower erosion rate and secured long-term vegetation cover. This could also lead to lower costs for roadside maintenance as lower erosion rates would require less frequent stabilizing treatments and mowing could be kept to a minimum in order not to disfavor shrubs.                                                                                                             

  • 48.
    Jägerbrand, Annika K.
    et al.
    Statens väg- och transportforskningsinstitut, Miljö, MILJÖ.
    Alatalo, Juha M
    Jönköpings Universitet.
    Chrimes, Dillon
    University of Tokyo.
    Molau, Ulf
    Göteborgs Universitet.
    Plant community responses to 5 years of simulated climate change in meadow and heath ecosystems at a subarctic-alpine site2009In: Oecologia, ISSN 0029-8549, E-ISSN 1432-1939, Vol. 161, no 3, p. 601-610Article in journal (Refereed)
    Abstract [en]

    Climate change was simulated by increasing temperature and nutrient availability in an alpine landscape. We conducted a field experiment of BACI-design (before/after control/impact) running for five seasons in two alpine communities (heath and meadow) with the factors temperature (increase of ca. 1.5-3.0°C) and nutrients (5 g N, 5 g P per m 2) in a fully factorial design in northern Swedish Lapland. The response variables were abundances of plant species and functional types. Plant community responses to the experimental perturbations were investigated, and the responses of plant functional types were examined in comparison to responses at the species level. Nutrient addition, exclusively and in combination with enhanced temperature increase, exerted the most pronounced responses at the species-specific and community levels. The main responses to nutrient addition were increases in graminoids and forbs, whereas deciduous shrubs, evergreen shrubs, bryophytes, and lichens decreased. The two plant communities of heath or meadow showed different vegetation responses to the environmental treatments despite the fact that both communities were located on the same subarctic-alpine site. Furthermore, we showed that the abundance of forbs increased in response to the combined treatment of temperature and nutrient addition in the meadow plant community. Within a single-plant functional type, most species responded similarly to the enhanced treatments although there were exceptions, particularly in the moss and lichen functional types. Plant community structure showed BACI responses in that vegetation dominance relationships in the existing plant functional types changed to varying degrees in all plots, including control plots. Betula nana and lichens increased in the temperature-increased enhancements and in control plots in the heath plant community during the treatment period. The increases in control plots were probably a response to the observed warming during the treatment period in the region.

  • 49.
    Jägerbrand, Annika K.
    et al.
    Statens väg- och transportforskningsinstitut, Miljö, MILJÖ.
    Björk, Robert
    Göteborgs Universitet.
    Callaghan, Terry
    Seppelt, Rod
    Effects of climate change on tundra bryophytes2011In: Bryophyte ecology and climate change / [ed] Nancy Slack, Zoltan Tuba, and Lloyd Stark, Cambridge University Press, 2011, 1, p. 211-236Chapter in book (Other academic)
  • 50.
    Jägerbrand, Annika K.
    et al.
    Statens väg- och transportforskningsinstitut, Miljö, MILJÖ.
    Kudo, Gaku
    Hokkaido University.
    Short-term responses in maximum quantum yield of PSII (Fv/Fm) to ex situ temperature treatment of populations of bryophytes originating from different sites in Hokkaido, Northern Japan2016In: PLANTS, E-ISSN 2223-7747, Vol. 5, no 2, p. 455-465Article in journal (Refereed)
    Abstract [en]

    There is limited knowledge available on the thermal acclimation processes for bryophytes, especially when considering variation between populations or sites. This study investigated whether short-term ex situ thermal acclimation of different populations showed patterns of site dependency and whether the maximum quantum yield of PSII (Fv/Fm) could be used as an indicator of adaptation or temperature stress in two bryophyte species: Pleurozium schreberi (Willd. ex Brid.) Mitt. and Racomitrium lanuginosum (Hedw.) Brid.

    We sought to test the hypothesis that differences in the ability to acclimate to short-term temperature treatment would be revealed as differences in photosystem II maximum yield (Fv/Fm). Thermal treatments were applied to samples from 12 and 11 populations during 12 or 13 days in growth chambers and comprised: (1) 10/5 °C; (2) 20/10 °C; (3) 25/15 °C; (4) 30/20 °C (12 hours day/night temperature).

    In Pleurozium schreberi, there were no significant site-dependent differences before or after the experiment, while site dependencies were clearly shown in Racomitrium lanuginosum throughout the study. Fv/Fm in Pleurozium schreberi decreased at the highest and lowest temperature treatments, which can be interpreted as a stress response, but no similar trends were shown by Racomitrium lanuginosum.

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