| 1. |
- Castro-Tirado, A. J., et al.
(författare)
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GRB 030227 : The first multiwavelength afterglow of an INTEGRAL GRB
- 2003
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Ingår i: Astronomy & Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 411:1, s. 315-319
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Tidskriftsartikel (refereegranskat)abstract
- We present multiwavelength observations of a gamma-ray burst detected byINTEGRAL (GRB 030227) between 5.3 hours and ~ 1.7days after the event. Here we report the discovery of a dim opticalafterglow (OA) that would not have been detected by many previoussearches due to its faintess (R ~ 23). This OA was seen to declinefollowing a power law decay with index alpha R = -0.95 +/-0.16. The spectral index beta_ opt/NIR yielded -1.25 +/- 0.14. Thesevalues may be explained by a relativistic expansion of a fireball (withp = 2.0) in the cooling regime. We also find evidence for inverseCompton scattering in X-rays.Based on observations with INTEGRAL, an ESA project with instruments andscience data centre funded by ESA member states (especially the PIcountries: Denmark, France, Germany, Italy, Switzerland, Spain), CzechRepublic and Poland, and with the participation of Russia and the USA.Also partially based on observations collected by the Gamma-Ray BurstCollaboration at ESO (GRACE) at the European Southern Observatory, Chile(ESO Large Programme 165.H-0464).
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| 2. |
- Andersson, N, et al.
(författare)
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Structural features and adsorption behaviour of mesoporous silica particles formed from droplets generated in a spraying chamber
- 2004
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Ingår i: Microporous and Mesoporous Materials. - 1387-1811 .- 1873-3093. ; 72, s. 175-183
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Tidskriftsartikel (refereegranskat)abstract
- Spherical mesoporous particles have been produced by spraying hydrolysed alkoxide solutions containing templating amphiphilic molecules. The modified spray drying method produces up to 10 g/h of spherical non-hollow particles with a size of 1–5 m. Transmission electron microscopy and X-ray diffraction showed that well ordered internal 2D hexagonal mesostructures could be prepared using both nonionic block copolymers and cationic surfactants as the templating molecules. Disordered cubic and well ordered lamellar, onion like, particles were prepared from the block copolymer templates. Nitrogen sorption data and mercury porosimetry show that pore size distribution of the mesoporous particles is very narrow with pore sizes varying from 2.5 to 8.5 nm as a function of templating amphiphiles. We have shown that the mesoscopic pores are accessible after calcination and can be filled with relatively large molecules; the particles adsorbed more than 20% (by weight) of the cationic dye Janus Green B from aqueous solutions.
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| 3. |
- Andre, M., et al.
(författare)
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Multi-spacecraft observations of broadband waves near the lower hybrid frequency at the Earthward edge of the magnetopause
- 2001
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Ingår i: Annales Geophysicae. - : Copernicus GmbH. - 0992-7689 .- 1432-0576. ; 19:12-okt, s. 1471-1481
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Tidskriftsartikel (refereegranskat)abstract
- Broadband waves around the lower hybrid frequency (around 10 Hz) near the magnetopause are studied, using the four Cluster satellites. These waves are common at the Earthward edge of the boundary layer, consistent with earlier observations, and can have amplitudes at least up to 5 mV/m. These waves are similar on all four Cluster satellites, i.e. they are likely to be distributed over large areas of the boundary. The strongest electric fields occur during a few seconds, i.e. over distances of a few hundred km in the frame of the moving magnetopause, a scale length comparable to the ion gyroradius. The strongest magnetic oscillations in the same frequency range are typically found in the boundary layer, and across the magnetopause. During an event studied in detail, the magnetopause velocity is consistent with a large-scale depression wave, i.e. an inward bulge of magnetosheath plasma, moving tailward along the nominal magnetopause boundary. Preliminary investigations indicate that a rather flat front side of the large-scale wave is associated with a rather static small-scale electric field, while a more turbulent backside of the large-scale wave is associated with small-scale time varying electric field wave packets.
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| 4. |
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| 5. |
- Beylich, A.A., Kolstrup, E., Thyrsted, T., Linde, N., Pedersen, L.B.
(författare)
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Assessment of chemical denudation rates in cold environments
- 2004
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Ingår i: A handbook of periglacial field methods. - : www.unis.no. ; , s. 18pp-
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Tidskriftsartikel (refereegranskat)
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| 6. |
- Hassing, Linda, 1967, et al.
(författare)
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Type 2 diabetes mellitus contributes to cognitive change in the oldest old: A longitudinal population-based study
- 2004
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Ingår i: Journal of the International Neuropsychological Society. ; :10, s. 599-607
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Tidskriftsartikel (refereegranskat)abstract
- We examined change in neuropsychological test performance related to type 2 diabetes mellitus across a 6-year interval. A population-based sample of 274 elderly participants (36 with diabetes and 238 without diabetes) was examined at four occasions at a 2-year interval. The participants were 80–93 years of age (M 5 82.8 years) and without dementia at baseline. The test battery included tests of speed, visuospatial ability, short-term memory, semantic memory, episodic memory, and the Mini Mental Status Examination. Several models, taking into account diabetes and demographic data, were analyzed using SAS Proc Mixed multilevel modeling. At baseline, there were no significant differences in the neuropsychological tests related to diabetes. The longitudinal analyses, however, showed that diabetes was a significant predictor of decline for many of the tests. These findings points to the conclusion that type 2 diabetes is associated with accelerated cognitive decline in old age that may result in dementia.
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| 7. |
- Johansson, Boo, et al.
(författare)
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Change in cognitive cababilities in the old-old: The effects of proximity to death in genetically-related individuals over a six-year period.
- 2004
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Ingår i: Psych Aging. - : American Psychological Association (APA). ; :19, s. 145-156
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Tidskriftsartikel (refereegranskat)abstract
- Change in cognitive abilities was assessed over a 6-year period in a sample of monozygotic and same-sex dizygotic twin pairs (N = 507 individuals), aged 80 and older (mean age = 83.3 years: SD = 3.1). who remained nondemented over the course of the study. Latent growth models (LGMs) show that chronological age and time to death are consistent predictors of decline in measures of memory, reasoning, speed, and verbal abilities. Multivariate LGM analysis resulted in weak and often negative correlations among rates of change between individuals within twin pairs, indicating greater differential change within twin pairs than occurs on average across twin pairs. These findings highlight several challenges for estimating genetic sources of variance in the context of compromised health and mortality-related change
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| 8. |
- Johansson, Boo, et al.
(författare)
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Sensitivity and specificity of dementia coding in two Swedish disease registries
- 2004
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Ingår i: Neurology. - 0028-3878. ; 63:4, s. 739-41
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Tidskriftsartikel (refereegranskat)abstract
- The authors investigated the sensitivity and specificity of dementia identification in two Swedish disease registries by using clinical diagnoses from two population-based studies as gold standards. The probability of dementia detected by the Inpatient Discharge Registry was 55% for prevalent patients and 31% for incident patients and was higher than detection by the Cause of Death Registry. Specificity was 98% for the Inpatient Discharge Registry and 100% for the Cause of Death Registry.
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| 9. |
- Johansson, C, et al.
(författare)
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Genetics of affective disorders
- 2001
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Ingår i: European neuropsychopharmacology : the journal of the European College of Neuropsychopharmacology. - 0924-977X. ; 11:6, s. 385-394
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Tidskriftsartikel (refereegranskat)
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| 10. |
- Kristensen, T N, et al.
(författare)
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The increase of fluctuating asymmetry in a monoclonal strain of collembolans after chemical exposure - discussing a new method for estimating the environmental variance
- 2004
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Ingår i: Ecological Indicators. - : Elsevier BV. - 1872-7034 .- 1470-160X. ; 4:1, s. 73-81
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Tidskriftsartikel (refereegranskat)abstract
- The increasing demand for detecting and quantifying the negative effects on natural habitats caused by anthropogenic activity has led to the development of impact assessment tools. Here, we propose a monitoring method based on the concept of developmental instability (DI) estimated from fluctuating asymmetry (FA) in bilateral morphological traits in a monoclonal strain. The use of monoclonal populations conveys certain advantages over sexual populations when interpreting fluctuating asymmetry results. This is because the inherent problems of genetic heterogeneity are circumvented. Our investigation demonstrates in practice, how an estimate of the environmental component of the phenotypic variance in a population can be achieved. This estimate can be used to eliminate samples where the presence of macro environmental variance has influenced the estimated level of fluctuating asymmetry significantly. Avoiding the confounding effect due to the presence of genetic variance and controlling the environmental variance component enable a more accurate estimate of the possible detrimental effects of the putative stressing agents. We used a clonal strain of the springtail Folsomia candida exposed to three different contaminants; tributyltin, nonylphenol and bis(2-ethylhexyl)-phthalate (DEPH), in order to test the general applicability of the proposed method. The results show that the method is efficient in discriminating between environments exposed to chemical stress and control environments. However, establishing an actual dose-response relationship was only possible for one of the contaminants, nonylphenol.
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