| 1. |
- Björnsdotter, Malin
(författare)
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Brain Processing of CT-Targeted Stimulation
- 2016
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Ingår i: Affective Touch and the Neurophysiology of CT Afferents. Olausson, H., Wessberg, J., Morrison, I., McGlone, F. (Eds.). - New York, NY : Springer. - 9781493964185 ; , s. 187-194
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Bokkapitel (refereegranskat)
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| 2. |
- Brown, James R., et al.
(författare)
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Does Transparency Stifle or Facilitate Innovation?
- 2019
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Ingår i: Management science. - : INFORMS. - 0025-1909 .- 1526-5501. ; 65:4, s. 1600-1623
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Tidskriftsartikel (refereegranskat)abstract
- Corporate transparency reduces information asymmetries between firms and capital markets but increases the costs associated with information leakage to competitors. We explore how a country's information environment affects innovation, an activity characterized by high information asymmetries and potentially severe proprietary costs. Studying both long-run cross-country differences in the availability of firm-specific information to corporate outsiders, as well as quasi-experimental shocks to the information environment following transparency-enhancing security market reforms, we document significantly higher rates of R&D and patenting in richer information environments. The effects of transparency are strongest in industries that rely on external equity rather than bank debt, indicating that transparency facilitates innovation by reducing the information costs associated with arm's-length financing. In contrast, transparency has no impact on physical capital accumulation, consistent with fewer information asymmetries in tangible assets. An economy's information environment has important but heterogeneous effects on the nature and extent of real economic activity.
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| 3. |
- Elmståhl, Sölve, et al.
(författare)
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Autonomic cardiovascular responses to tilting in patients with alzheimer's disease and in healthy elderly women
- 1992
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Ingår i: Age and Ageing. - : Oxford University Press (OUP). - 0002-0729 .- 1468-2834. ; 21:4, s. 301-307
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Tidskriftsartikel (refereegranskat)abstract
- The cardiovascular responses to tilting and breathing were studied in 24 patients with late-onset Alzheimer's disease (AD) and 54 healthy control women aged between 75 and 96 years in order to study the parasympathetic and sympathetic heart-rate control. The cardiovascular response to tilting and breathing showed no age-associated decrease in the healthy control women. During rest, the AD patients had lower mean systolic and diastolic blood pressure but the same heart rate as the control patients. After tilting, the AD patients had a greater increase in heart rate, and the mean systolic blood pressure fell to 126 mmHg compared with 160 mmHg in the control women (p<0.001). After the initial acceleration, the following deceleration of the heart rate, an expression of parasympathetic nervous activity, was lower in the AD patients (p <0.001). The deep-breathing test showed no significant difference between the two groups, but the changes of acceleration and brake indices could indicate a dysfunction of the autonomic nervous system since the AD patients were not recumbent.
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| 4. |
- Salomon, Kim
(författare)
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Utrotningens maskineri
- 2011
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Ingår i: Svenska Dagbladet. - 1101-2412. ; :14 februari 2011
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Recension (populärvet., debatt m.m.)
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| 5. |
- Sundqvist, Elin, et al.
(författare)
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Methane exchange in a boreal forest estimated by gradient method
- 2015
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Ingår i: Tellus. Series B, Chemical and physical meteorology. - : Stockholm University Press. - 0280-6509 .- 1600-0889. ; 67
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Tidskriftsartikel (refereegranskat)abstract
- Forests are generally considered to be net sinks of atmospheric methane (CH4) because of oxidation by methanotrophic bacteria in well-aerated forests soils. However, emissions from wet forest soils, and sometimes canopy fluxes, are often neglected when quantifying the CH4 budget of a forest. We used a modified Bowen ratio method and combined eddy covariance and gradient methods to estimate net CH4 exchange at a boreal forest site in central Sweden. Results indicate that the site is a net source of CH4. This is in contrast to soil, branch and leaf chamber measurements of uptake of CH4. Wetter soils within the footprint of the canopy are thought to be responsible for the discrepancy. We found no evidence for canopy emissions per se. However, the diel pattern of the CH4 exchange with minimum emissions at daytime correlated well with gross primary production, which supports an uptake in the canopy. More distant source areas could also contribute to the diel pattern; their contribution might be greater at night during stable boundary layer conditions.
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| 6. |
- Sundqvist, Elin, et al.
(författare)
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Upscaling of methane exchange in a boreal forest using soil chamber measurements and high-resolution LiDAR elevation data
- 2015
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Ingår i: Agricultural and Forest Meteorology. - : Elsevier BV. - 1873-2240 .- 0168-1923. ; 214, s. 393-401
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Tidskriftsartikel (refereegranskat)abstract
- Forest soils are generally considered to be net sinks of methane (CH4), but CH4 fluxes vary spatially depending on soil conditions. Measuring CH4 exchange with chambers, which are commonly used for this purpose, might not result in representative fluxes at site scale. Appropriate methods for upscaling CH4 fluxes from point measurements to site scale are therefore needed. At the boreal forest research site, Norunda, chamber measurements of soils and vegetation indicate that the site is a net sink of CH4, while tower gradient measurements indicate that the site is a net source of CH4. We investigated the discrepancy between chamber and tower gradient measurements by upscaling soil CH4 exchange to a 100 ha area based on an empirical model derived from chamber measurements of CH4 exchange and measurements of soil moisture, soil temperature and water table depth. A digital elevation model (DEM) derived from high-resolution airborne Light Detection and Ranging (LiDAR) data was used to generate gridded water table depth and soil moisture data of the study area as input data for the upscaling. Despite the simplistic approach, modeled fluxes were significantly correlated to four out of five chambers with R>0.68. The upscaling resulted in a net soil sink of CH4 of -10 mu mol m(-2) h(-1), averaged over the entire study area and time period June-September, 2010). Our findings suggest that additional contributions from CH4 soil sources outside the upscaling study area and possibly CH4 emissions from vegetation could explain the net emissions measured by tower gradient measurements. (C) 2015 Elsevier B.V. All rights reserved.
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| 7. |
- Sundqvist, Gustav, et al.
(författare)
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A general, robust method for the quality control of intact proteins using LC–ESI-MS
- 2007
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Ingår i: Journal of chromatography. B. - : Elsevier BV. - 1570-0232 .- 1873-376X. ; 852:1-2, s. 188-194
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Tidskriftsartikel (refereegranskat)abstract
- A simple and robust method for the routine quality control of intact proteins based on liquid chromatography coupled to electrospray ionization mass spectrometry (LC-ESI-MS) is presented. A wide range of prokaryotic and eukaryotic proteins expressed recombinantly in Escherichia coli or Pichia pastoris has been analyzed with medium- to high-throughput with on-line desalting from multi-well sample plates. Particular advantages of the method include fast chromatography and short cycle times, the use of inexpensive trapping/desalting columns, low sample carryover, and the ability to analyze proteins with masses ranging from 5 to 100 kDa with greater than 50 ppm accuracy. Moreover, the method can be readily coupled with optimized chemical reduction and alkylation steps to facilitate the analysis of denatured or incorrectly folded proteins (e.g., recombinant proteins sequestered in E. coli inclusion bodies) bearing cysteine residues, which otherwise form intractable multimers and non-specific adducts by disulfide bond formation.
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| 8. |
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| 9. |
- Svagan, Anna, 1979-, et al.
(författare)
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Reduced water vapour sorption in cellulose nanocomposites with starch matrix
- 2009
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Ingår i: Composites Science And Technology. - : Elsevier BV. - 0266-3538 .- 1879-1050. ; 69:3-4, s. 500-506
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Tidskriftsartikel (refereegranskat)abstract
- The effects of microfibrillated cellulose nanofibers from wood on the moisture sorption kinetics (30% RH) of glycerol plasticized and pure high-amylopectin starch films were studied. The presence of a nanofiber network (70 wt% cellulose nanofibers) reduced the moisture uptake to half the value of the pure plasticized starch film. The swelling yielded a moisture concentration-dependent diffusivity. Quite surprisingly, the moisture diffusivity decreased rapidly with increasing nanofiber content and the diffusivity of the neat cellulose network was, in relative terms, very low. It was possible to describe the strong decrease in zero-concentration diffusivity with increasing cellulose nanofiber/matrix ratio, simply by assuming only geometrical blocking using the model due to Aris. The adjusted model parameters suggested a "simplified" composite structure with dense nanofiber layers oriented in the plane of the film. Still, also constraining effects on swelling from the high modulus/hydrogen bonding cellulose network and reduced amylopectin molecular mobility due to strong starch-cellulose molecular interactions were suggested to contribute to the reductions in moisture diffusivity.
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| 10. |
- Svagan, Anna, et al.
(författare)
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Towards tailored hierarchical structures in cellulose nanocomposite biofoams prepared by freezing/freeze-drying
- 2010
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Ingår i: Journal of Materials Chemistry. - : Royal Society of Chemistry (RSC). - 0959-9428 .- 1364-5501. ; 20:32, s. 6646-6654
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Tidskriftsartikel (refereegranskat)abstract
- Cellulose nanofiber (MFC) reinforced starch-based foams, prepared by the freezing/freeze-drying route, are very interesting porous materials due to the strong MFC reinforcement of the cell wall itself. However, in order to fully realize the potential of these nanocomposite biofoams, both cell wall composition and cell structure must be controlled. The effect of starch-MFC-water suspension composition, together with preparation temperature (-27, -78, and -196 degrees C) on the foam cell structure is investigated. NMR-analysis of bound water content, DSC and freezing experiments in combination with freeze-drying experiments and FE-SEM microscopy are used to determine a suitable freeze-drying temperature. The freeze-drying temperature is critical in order to avoid cell structure collapse, as found from FE-SEM studies. By varying the cell-wall composition and preparation temperature, the foam morphology can be manipulated. The connection between cell size and starch content is considered to depend on the inherent properties of starch and a mechanism for ice crystal formation is suggested. Based on improved preparation conditions, foams with mixed open and closed cell structures and as much as 70 wt% MFC in the cell wall are created successfully.
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