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| 3. |
- Ansved, Tor, et al.
(författare)
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Enzyme-histochemical and morphological characteristics of fast- and slow-twitch skeletal muscle after brain infarction in the rat
- 1996
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Ingår i: Journal of the Neurological Sciences. - 1878-5883. ; 144:1-2, s. 14-20
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Tidskriftsartikel (refereegranskat)abstract
- The right middle cerebral artery was permanently occluded in 12-week-old male spontaneously hypertensive rats. After the surgery the rats were subjected to repeated behavioural tests during the observation period. Fourteen weeks after surgery the fast-twitch extensor digitorum longus (EDL) and the slow-twitch soleus muscle of both sides were removed and examined with regard to muscle fibre characteristics obtained by histochemical and morphometrical methods. Comparisons were made with age-matched controls. Limb placement and the ability to traverse a beam or a rotating pole were repeatedly tested 2-13 weeks after the operation. In spite of permanent sensorimotor deficits in limb placement and when traversing a rotating pole or beam, no increase in pathological changes was noted in either EDL or soleus. The number and proportion of fibre types remained unchanged in both muscles. There was no difference in muscle fibre size in either EDL or soleus. It is concluded that brain infarction in the rat, although causing marked impairment of contralateral motor function, does not have a major influence on the muscle-fibre morphology or fibre-type composition, irrespective of muscle type.
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- Jakobsson, Anna-Maria, 1970
(författare)
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Measurement and modeling of Th sorption onto TiO2
- 1999
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Ingår i: Journal of Colloid and Interface Science. - 1095-7103 .- 0021-9797. ; 220:2, s. 367-373
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Tidskriftsartikel (refereegranskat)abstract
- The sorption and desorption of Th onto TiO2 (10 gn) was studied as a function of pH (1-11), ionic strength (0.005-0.1 M NaCl, NaClO4), thorium concentration (from 1 x 10(-9) to 3 x 10(-2) M), and carbonate concentration (up to 10-2 M) using Th-234 tracer. The results indicate the reversible formation of an inner sphere complex with a strong pH dependence. No effect of the carbonate on sorption could be measured in the pH range investigated (5-10.5), The data were fitted with five different conceptual models (constant capacitance, diffuse layer, Stern, triple layer, and a nonelectrostatic model) using FITEQL. Different hydroxy complex surface reactions were tried, one at a time, varying the site density (1-12 sites/nm(2)). The reaction that provided the best fit depended strongly on the surface site density and the model used. To be able to fit a reaction to the pH-dependent data with the compact layer models, the effect of the electrostatic term had to be decreased by decreasing the site density below 5 sites/nm(2). None of the electrostatic models could be used to fit all of the isotherm data. The nonelectrostatic model could be used to reasonably fit both the pH-dependent and isotherm data.
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- Jakobsson, Anna-Maria, 1970
(författare)
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Measurement and Modelling using Surface Complexation of Cation (II to VI) Sorption onto Mineral Oxides
- 1999
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The aim of this work was to experimentally and theoretically study some surface complexation models and how well these can be applied to a simple system. This is done while keeping in mind the interest in including some type of chemical model in performance assessment calculations for much more complex systems. One matter if importance has been that it should be possible to determine all the input parameters that affect the prediction of the sorption. This work contains studies of the sorption of five different cations, and the results have been interpreted in terms of surface complexation models. Sorption has been studied as a function of pH, concentration of sorbing cation and ionic strength using a radioactive tracer. The results of the sorption studies are presented as the distribution ratio with respect to surface area (Ka) between the phases as a function of pH or concentration. Some comparisons of the results are made with other sorption studies of similar character in the literature. None of the cations studied in this work have shown a dependence on ionic strength. Different surface complexation modeling approaches were employed in this work. All the sorption data on TiO2) were fitted with a non electrostatic model, which does not include the effect of the charge build-up of the surface on the sorption. The input parameters of the surface complexation models are discussed and the impact of these on the fitting of the models to the data have been examined. To investigate the effect of some parameters that are difficult to determine experimentally, their values have been varied in the fitting. It was found that a simple 1-pK non electrostatic model could fit all the sorption data onto TiO2 satisfactorily with no indeterminable input parameters. So far, the model might thus be useful. However, the model was not able to fit the sorption behaviour at high concentrations. If a model is to be employed in such a case, it must be extended by including some kind of surface precipitation or other reaction to be able to model the observed isotherm.
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| 8. |
- Sollenberg, Margareta, et al.
(författare)
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Major Armed Conflicts, 1994 (Appendix)
- 1995
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Ingår i: SIPRI Yearbook 1995. - : Oxford University Press, Oxford. ; , s. 26-35
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Bokkapitel (refereegranskat)
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| 9. |
- Sollenberg, Margareta, et al.
(författare)
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Major Armed Conflicts, 1995 (Appendix)
- 1996
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Ingår i: SIPRI Yearbook 1996. - : Oxford University Press, Oxford. ; , s. 22-30
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Bokkapitel (refereegranskat)
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