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Träfflista för sökning "WFRF:(Bergström Göran) srt2:(2010-2011)"

Sökning: WFRF:(Bergström Göran) > (2010-2011)

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1.
  • Bodvik, Rasmus, et al. (författare)
  • Aggregation and network formation of aqueous methylcellulose and hydroxypropylmethylcellulose solutions.
  • 2010
  • Ingår i: Colloids and Surfaces A : Physicochemical and Engineering Aspects. - Elsevier. - 0927-7757. ; 354:1-3, s. 162-171
  • Tidskriftsartikel (refereegranskat)abstract
    • Solution properties of methylcellulose (MC) and hydroxypropylmethylcellulose (HPMC) have been investigated as a function of temperature and concentration using a broad range of experimental techniques. Novelties include the extensive comparison between MC and HPMC solutions as well as the combination of techniques, and the use of Cryo transmission electron microscopy (Cryo-TEM). The correlation between rheology and light scattering results clearly demonstrates the relation between viscosity change and aggregation. Cryo-TEM images show the network structures formed. Viscosity measurements show that for both MC and HPMC solutions sudden changes in viscosity occur as the temperature is increased. The onset temperature for these changes depends on polymer concentration and heating rate. For both MC and HPMC solutions the viscosity on cooling is very different compared to on heating, demonstrating the slow equilibration time. The viscosity changes in MC and HPMC solutions are dramatically different; for MC solutions the viscosity increases by several orders of magnitude when a critical temperature is reached, whereas for HPMC solutions the viscosity decreases abruptly at a given temperature, followed by an increase upon further heating. Light and (SAXS) small-angle X-ray scattering shows that the increase in viscosity, for MC as well as for HPMC solutions, is due to extensive aggregation of the polymers. Light scattering also provides information on aggregation kinetics. The SAXS measurements allow us to correlate aggregation hysteresis to the viscosity hysteresis, as well as to extract some structural information. Cryo-TEM images give novel information that a fibrillar network is formed in MC solutions, and the strong viscosity increase occurs when this network spans the whole solution volume. For HPMC solutions the behaviour is more complex. The decrease in viscosity can be related to the formation of compact objects, and the subsequent increase to formation of fibrillar structures, which are more linear and less entangled than for MC.
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2.
  • Edenius, Lars, et al. (författare)
  • The effects of changing land use and browsing on aspen abundance and regeneration: a 50-year perspective from Sweden
  • 2011
  • Ingår i: Journal Of Applied Ecology. - 0021-8901. ; 48:2, s. 301-309
  • Tidskriftsartikel (refereegranskat)abstract
    • 5. Synthesis and applications. Our results suggest that changes in land use practices are the main cause of changes in aspen abundance at regional and national scales in Sweden during the last 50 years. Restoring regeneration niches, most importantly emulating natural disturbance processes, viz. fire at various spatial scales, and retaining aspen in cleaning and pre-commercial thinnings are the most important management recommendations to secure regeneration of aspen. Protecting established aspen ramets at designated sites from browsing either by fencing or reducing ungulate numbers could be used as complementary management tools.
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4.
  • Andersson, Gerhard, et al. (författare)
  • Paniksyndrom : ond cirkel av feltolkade kroppsliga signaler
  • 2011
  • Ingår i: Läkartidningen. - 0023-7205. ; 108:14, s. 795-797
  • Tidskriftsartikel (refereegranskat)abstract
    • Attacker av intensiv rädsla utan tydlig yttre orsak som leder till rädsla för nya attacker – det kännetecknar paniksyndrom. Evidensbaserade behandlingsalternativ finns, och det finns inget skäl att avvakta med behandling.
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5.
  • Behre, Carl Johan, 1968-, et al. (författare)
  • Increasing Leisure Time Physical Activity is Associated With Less Prevalence of the Metabolic Syndrome in Healthy Middle-Aged Men
  • 2011
  • Ingår i: Angiology. - 1940-1574.
  • Tidskriftsartikel (refereegranskat)abstract
    • The metabolic syndrome (MetS) is characterized by a constellation of factors that confer an increased risk for cardiovascular morbidity and mortality. It is well-known that physical activity (PA) has a protective role on cardiovascular morbidity and mortality, mainly through its favorable effects on traditional risk factors such as body mass and blood pressure (BP). We assessed the prevalence of MetS in a population-based sample of 58-year-old men with respect to leisure-time PA and also to occupational PA. The results showed an inverse linear association (P < .05) between leisure time physical activity (LTPA) and MetS in this group. In conclusion, this study suggests that PA has an important role in controlling MetS.
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6.
  • Behre, Carl Johan, 1968-, et al. (författare)
  • Moderate physical activity is associated with lower apoB/apoA-I ratio, independently of other risk factors in healthy middle-aged men.
  • 2010
  • Ingår i: Angiology. - 0003-3197. ; 61:8, s. 775-779
  • Tidskriftsartikel (refereegranskat)abstract
    • Low-density lipoprotein is recognized as a primary vascular risk factor. However, recent data favor apolipoprotein (apo)B and apoA-I as risk factors with higher predictive values than conventional lipids. We investigated how leisure-time physical activity relates to the serum apoB/apoA-I ratio in middle-aged men. The results showed that compared with a sedentary lifestyle, moderate physical activity was associated with a decreased apoB/apoA-I ratio (1.01 ± 0.28 vs 0.87 ± 0.24, P < .05) and increased apoA-I levels (1.30 ± 0.20 g/L vs 1.43 ± 0.22 g/L, P < .05), whereas vigorous activity was required to observe a reduction in apoB levels (1.27 ± 0.28 g/L vs 1.14 ± 0.24 g/L, P < .05). A covariate analysis showed that leisure time physical activity was also associated with reduced apoB/apoA-I ratios after adjustment for smoking, systolic blood pressure and waist circumference. Importantly, this association was seen at moderate levels of physical activity, supporting the notion that some activity is better than none.
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7.
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8.
  • Bergström, Ulf, et al. (författare)
  • Pulmonary dysfunction, smoking, socioeconomic status and the risk of developing rheumatoid arthritis.
  • 2011
  • Ingår i: Rheumatology (Oxford, England). - 1462-0332. ; 50, s. 2005-2013
  • Tidskriftsartikel (refereegranskat)abstract
    • Objectives. Environmental risk factors are of potential interest for both prevention and treatment of RA. The purpose of this study was to examine the effect of pulmonary function, smoking and socio-economic status on the future risk of RA. Methods. Between 1974 and 1992, 22 444 men and 10 902 women were included in the Malmö Preventive Medicine Program (MPMP). Pulmonary function was assessed by a standard screening spirometry. Chronic obstructive pulmonary disease (COPD) and restrictive pulmonary dysfunction were defined based on pulmonary function tests. Individuals who developed RA were identified by linking the MPMP database to national and local RA registers. The patients were classified according to the 1987 ACR criteria for RA. Four matched controls for every case were selected. Results. We identified 290 cases of incident RA (151 men/139 women; mean age at diagnosis 60 years). The median time from inclusion to diagnosis was 12 years. Forced vital capacity and forced expiratory volume within 1 s values were similar in cases and controls, overall and also in separate analysis of those screened ≤8 years before diagnosis. There was no association between COPD or restrictive pulmonary dysfunction and subsequent development of RA. Current smoking was a strong predictor for RA odds ratio (OR) 1.79; 95% CI 1.32, 2.42. Blue-collar workers had an increased risk of RA (OR 1.54; 95% CI 1.12, 2.10), independent of smoking. Conclusion. Pulmonary dysfunction did not predict RA, but smoking and low socio-economic status were independent risk factors for RA. Other effects of smoking may be important for RA susceptibility
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9.
  • Danell, Kjell, et al. (författare)
  • Viltpopulationernas storlek
  • 2010
  • Ingår i: Vilt, människa, samhälle.
  • Bokkapitel (övrigt vetenskapligt)
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10.
  • Dettki, Holger, et al. (författare)
  • Can supplementary feeding be used to redistribute moose Alces alces?
  • 2010
  • Ingår i: Wildlife Biology. - 0909-6396. ; 16:1, s. 85-92
  • Tidskriftsartikel (refereegranskat)abstract
    • Foraging patterns, behaviour and the distribution of animals are affected by the availability and distribution of food in the landscape. Increasing numbers of ungulates may also be in conflict with agriculture, timber, infrastructure and conservation interests. Understanding foraging habits of ungulates and how these are affected by a change in forage availability or composition are, therefore, issues of major importance both from ecological and management perspectives. Supplementary feeding (i.e. artificial supply of food) is being used to improve local habitat, and thereby affecting ungulate movements, habitat choice and migration patterns. We experimentally tested the predictions that supplementary feeding redistributes moose Alces alces during two different migration phases (early, i.e. during the onset of migration and late, i.e. in the wintering areas). We used individually marked moose and pellet group counts to investigate the effect of supplementary feeding both at the individual and population level. We monitored 30 moose with GPS-collars before, during and after the supplementary feeding experiment, corresponding to 8-10% of the moose population in two different valleys in Northern Scandinavia. During early migration, moose ignored supplementary feeding sites even though migration routes were close to the sites. At the end of the migration route, supplementary feeding affected moose movement, distribution and behaviour. In conclusion, we suggest that there is a clear difference in response to supplementary feeding by moose due to the phase of migration. We conclude that supplementary feeding can be used under certain conditions to redistribute moose in relation to browsing, or to traffic, preferably at the end-point of migration.
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