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Sökning: WFRF:(Håkansson Johan)

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1.
  • Brandtler, Johan, et al. (författare)
  • Negation, Contrast, and the Swedish Prefield
  • 2012
  • Ingår i: Discourse and Grammar. A Festschrift in Honor of Valéria Molnár. - Lund : Lunds universitet. - 9789163704116 ; , s. 75-91, s. 75-91
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
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2.
  • Schoug, Åsa, et al. (författare)
  • Freeze-drying of Lactobacillus coryniformis Si3--effects of sucrose concentration, cell density, and freezing rate on cell survival and thermophysical properties
  • 2006
  • Ingår i: Cryobiology. - Maryland Heights, USA : Elsevier BV. - 0011-2240 .- 1090-2392. ; 53:1, s. 119-127
  • Tidskriftsartikel (refereegranskat)abstract
    • Freeze-drying is commonly used to stabilize lactic acid bacteria. Many factors have been reported to influence freeze-drying survival, including bacterial species, cell density, lyoprotectant, freezing rate, and other process parameters. Lactobacillus coryniformis Si3 has broad antifungal activity and a potential use as a food and feed biopreservative. This strain is considered more stress sensitive, with a low freeze-drying survival, compared to other commercialized antifungal lactic acid bacterial strains. We used a response surface methodology to evaluate the effects of varying sucrose concentration, cell density and freezing rate on Lb. coryniformis Si3 freeze-drying survival. The water activity of the dry product, as well as selected thermophysical properties of importance for freeze-drying; degree of water crystallization and the glass transition temperature of the maximally freeze concentrated amorphous phase (Tg') were determined. The survival of Lb. coryniformis Si3 varied from less than 6% to over 70% between the different conditions. All the factors studied influenced freeze-drying survival and the most important factor for survival is the freezing rate, with an optimum at 2.8 degrees C/min. We found a co-dependency between freezing rate and formulation ingredients, indicating a complex system and the need to use statistical tools to detect important interactions. The degree of water crystallization decreased and the final water activity increased as a function of sucrose concentration. The degree of water crystallization and Tg' was not affected by the addition of 10(8)-10(10) CFU/mI. At 10(11) CFU/ml, these thermophysical values decreased possibly due to increased amounts of cell-associated unfrozen water.
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3.
  • Andersson, Pia, et al. (författare)
  • Marine Acidification : On effects and monitoring of marine acidification in the seas surrounding Sweden
  • 2008. - 2008:92
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • Surface waters in the world oceans have already experienced a pH reduction of about 0.1 units (OSPAR, 2006.) The trend indicates further decrease of pH and is most probably due to increased uptake of atmospheric CO2 and less buffering capacity of ocean waters. The trend is similar in the waters surrounding Sweden. RESEARCH NEEDS Since there is an alarming absence of information regarding the effects of near-future levels of ocean acidification on Swedish marine taxa, there is a clear research need on: • investigations of the effects of ocean acidification on the early life-history stages of key ecosystem-structuring species, and commercially important species of fish and shellfish • ecosystem-level mesocosm studies of the impacts of ocean acidification on Swedish marine systems • improved regional-scale modelling of acidification mechanisms in Swedish coastal waters • testable ecosystem-scale food-web models to articulate with regional acidification models • improved definition of chemical equilibrium constants between pH, AT and CO2 in low saline waters. ACTIONS TO IMPROVE MONITORING At present, pH and AT are monitored monthly at standard depths at 7 stations in Skagerrak, Kattegat and Baltic Proper within the national monitoring programme. Of these are 2 located in coastal waters (Halland and Småland; Type 5 and 9). We recommend that Sweden work to improve the status of pH and AT to be Core variables instead of Main variables in HELCOM COMBINE “High frequency Sampling” program taking into account the last 15 years negative trends in pH in waters surrounding Sweden as well as in the global oceans. We recommend that besides the standard para-meters monitored in the national monitoring program, pH, AT and DIC should be monitored. For completeness, primary production should also be monitored. Below are three monitoring recommendations, where the first is divided into a lowest level and a recommended level. 1. Lowest level: Within the national monitoring program, at least one station per open sea area and all costal stations measure acidification parameters on a monthly basis in the entire water column at standardized depths. The national and regional monitoring programmes should be upgraded in the Gulf of Bothnia so that pH and AT is monitored at standard depths at least monthly at one station each in the Bothnian Bay and Bothnian Sea. Also 2 coastal stations in the Gulf of Bothnia should be established. In addition, one coastal station should be established within Type 14 in the Baltic Proper. 1. Recommended level: the national monitoring program should have at least one station per open sea area and if the area is characterized by strong gradients or other features, there should be more than one station. Some of the stations in the regional monitoring programmes should be upgraded with acidification parameters, for a better geographical coverage. The acidification parameters should be measured on a monthly basis in the entire water column at standardized depths. 2. We recommend that an investigative monitoring is established by extending the parameters that are needed to firmly improve the chemical stability constants between pH, AT, DIC and pCO2 in low saline waters. This can be done by just extending the sampling program at selected monitoring stations. Sampling should cover a period of 2 to 3 years. 3. We recommend that direct water measurement of pCO2 for monitoring purposes should be assessed after the recommendation above is evaluated and that ongoing research projects on pCO2 measurements using ferryboxes are finalised. RECOGNISED PROBLEM AREAS • There are only few long time series of acidification parameters. The time period of measurements is rather short. • The geographical coverage of measurements is rather limited in the waters surrounding Sweden. • The chemical stability constants between pH, AT, DIC and pCO2 are not optimized in low saline waters. • pH budgets are difficult to calculate. • Models need to be improved in order to display present and future small and large scale scenarios. • Little is known of the biological, ecological and economical effects of the current and near future marine acidification. Further research is required.
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6.
  • Burgaz, A., et al. (författare)
  • Confirmed hypertension and plasma 25(OH)D concentrations amongst elderly men
  • 2011
  • Ingår i: Journal of Internal Medicine. - : Wiley. - 0954-6820 .- 1365-2796. ; 269:2, s. 211-218
  • Tidskriftsartikel (refereegranskat)abstract
    • Objectives. The results of experimental studies suggest that vitamin D deficiency activates the renin-angiotensin system and predisposes to hypertension. Results of previous epidemiological studies investigating the association between 25-hydroxyvitamin D [25(OH)D] status and hypertension have not been consistent, perhaps because of their sole reliance on office blood pressure (BP) measurements leading to some misclassification of hypertension status. No previous studies have examined the association between 25(OH)D status and confirmed hypertension assessed with both office and 24-h BP measurements. Design. In this cross-sectional study, we investigated 833 Caucasian men, aged 71 +/- 0.6 years, to determine the association between plasma 25(OH)D concentrations, measured with high-pressure liquid chromatography mass spectrometry, and the prevalence of hypertension. We used both supine office and 24-h BP measurements for classifying participants as normotensive or confirmed hypertensive; participants with inconsistent classifications were excluded. Results. In a multivariable adjusted logistic regression model, men with 25(OH)D concentrations < 37.5 nmol L-1 had a 3-fold higher prevalence of confirmed hypertension compared to those with >= 37.5 nmol L-1 25(OH)D (odds ratio = 3.3, 95% CI: 1.0-11.0). Conclusions. Our results show that low plasma 25(OH)D concentration is associated with a higher prevalence of confirmed hypertension.
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7.
  • Clemente, Francesco, et al. (författare)
  • Touch and Hearing Mediate Osseoperception
  • 2017
  • Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 7
  • Tidskriftsartikel (refereegranskat)abstract
    • Osseoperception is the sensation arising from the mechanical stimulation of a bone-anchored prosthesis. Here we show that not only touch, but also hearing is involved in this phenomenon. Using mechanical vibrations ranging from 0.1 to 6 kHz, we performed four psychophysical measures (perception threshold, sensation discrimination, frequency discrimination and reaction time) on 12 upper and lower limb amputees and found that subjects: consistently reported perceiving a sound when the stimulus was delivered at frequencies equal to or above 400 Hz; were able to discriminate frequency differences between stimuli delivered at high stimulation frequencies (similar to 1500 Hz); improved their reaction time for bimodal stimuli (i.e. when both vibration and sound were perceived). Our results demonstrate that osseoperception is a multisensory perception, which can explain the improved environment perception of bone-anchored prosthesis users. This phenomenon might be exploited in novel prosthetic devices to enhance their control, thus ultimately improving the amputees' quality of life.
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10.
  • Håkansson, Peter, et al. (författare)
  • Ungdomars engagemang i kulturföreningar och socialt kapital
  • 2010
  • Ingår i: "Mycket mer än bara rock" : musik, ungdom och organisering. - 9789185343133
  • Bokkapitel (populärvet., debatt m.m.)abstract
    • Ungdomars engagemang i föreningsverksamhet och organisering förutsägs ofta á priori vara något bra. Mer sällan problematiseras frågan, t.ex. genom att ställa frågan vem som organiserar sig. Denna artikel utgår från litteraturen om socialt kapital och har bl.a. tagit intryck av Bourdieus modell för socialt kapital. I en ekonomisk modell med inspiration från Bourdieu kommer värdet av en individs sociala kapital (relationer) att bestämmas av nätverksmedlemmarnas sammanlagda sociala, kulturella och ekonomiska kapital. Detta leder till att det finns ett högre incitament för dem som redan har ett högt sammanlagt kapital att investera i socialt kapital. Artikeln använder sig av data från Ungdomsstyrelsens enkät Lokal uppföljning av ungdomspolitiken (LUPP) för att skatta engagemanget i musikföreningar, givet andra former av kapital.
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