| 1. |
- Annertz, Mårten, et al.
(författare)
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Isthmic lumbar spondylolisthesis with sciatica. MR imaging vs myelography
- 1990
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Ingår i: Acta Radiologica. - 1600-0455. ; 31:5, s. 449-453
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Tidskriftsartikel (refereegranskat)abstract
- Seventeen patients with sciatica and isthmic lumbar spondylolisthesis were studied with magnetic resonance (MR) imaging. In 13, myelography was also performed: 5 had dural sac deformation and root sleeve shortening, 2 had deformation with unilateral root sleeve shortening, one had bilateral root sleeve shortening only, and one had sac deformation only. In 4, myelography was normal. On sagittal MR examinations the neural foramen had an altered shape bilaterally with the long axis horizontal in all cases. In addition to altered shape the following was found in the 33 foramina evaluated. I: normal nerve (n = 8); II: compressed nerve (n = 16); III: disappearance of fat, nerve not possible to identify (n = 9). In patients with unilateral sciatica, the degree of foraminal stenosis correlated well with the side of symptoms. Coronal views showed the course of the nerve and pedicular kinking. Eight patients underwent decompressive surgery which revealed nerve compression by hypertrophic fibrous tissue and pedicular kinking, which correlated well with the findings on MR. Since the site of nerve compression often was peripheral to the root sleeves, myelography did not give complete information.
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| 2. |
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| 3. |
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| 4. |
- Håkansson, H., et al.
(författare)
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In vivo and in vitro toxicity of fractionated fish lipids, with particular regard to their content of chlorinated organic compounds
- 1991
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Ingår i: Pharmacology and Toxicology. - : Wiley. - 0901-9928 .- 1600-0773. ; 69:6, s. 459-471
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Tidskriftsartikel (refereegranskat)abstract
- Six different lipid matrices (the intact lipid (IL), four lipid fractions with different polarity, and the free fatty acids (FFAs) obtained by hydrolysis of the triacylglycerol (TAG) containing fraction) were obtained from salmon (Salmo salar) and eel (Anguilla anguilla), each collected at a contaminated and a comparatively uncontaminated catch site along the coast of Scandinavia. The lipid matrices were studied in toxicological test systems representing various biological functions of different organ systems from several species and trophic levels. The results were evaluated with particular respect to the concentrations of extractable organically bound chlorine (EOCl) in the matrices tested. In some test systems, the specimens with a higher EOCl concentration appeared to be more toxic. For example, the TAG containing fraction (F2) from Idefjord eel, having a higher EOCl content than F2 from Oslofjord eel, reduced the number and hatchability of eggs laid by zebrafish. Both IL and F2 of Idefjord eel increased mortality and reduced the oxygen/nitrogen-ratio in blue mussels. Non-polar compounds (F1) from Bothnian Sea salmon induced 7-ethoxyresurofin O-deethylase (EROD) activity in rainbow trout hepatocytes, whereas F1 from Senja salmon did not. F1 from Bothnian Sea salmon also reduced the number of T-cells in foetal mouse thymus anlagen in vitro compared with the cell number in anlagen exposed to F1 from Senja salmon. A positive correlation between EOCl concentration and test response was found for EROD activity in rainbow trout hepatocytes and for ATP-leakage in Erlich ascites tumour cells when testing the phospolipid containing fraction (F4). However, in most test systems the fish oils, irrespective of EOCl content, were of low toxicity, and the observed effects need to be verified in future studies.
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| 5. |
- Johnsen, Sigfus J., et al.
(författare)
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A "deep" ice core from east Greenland
- 1992
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Ingår i: MoG Geoscience. ; 29
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Tidskriftsartikel (refereegranskat)abstract
- Pilot studies on the Renland peninsula in Scoresbysund Fjord, East Greenland, indicated that the relatively small and separate Renland ice cap meets most of the criteria defining a favourable ice-core drill-site. In 1988, a Nordic expedition recovered a continuous surface-to-bedrock ice core from the summit. This relatively short core reaches deep into the past, probably throughout the last glaciation and through most of the preceding interglacial, Eem, 125,000 years B.P. The core contains detailed information on temporal changes of the coastal environment, and serves as a valuable complement to the new deep ice cores being drilled in Central Greenland. Core analyses suggest that (1) during Eemian time the East Greenland climate was at least 5ÔC warmer than now, and the precipitation 20% higher; (2) during the last glacial period, the precipitation decreased to a minimum, perhaps only 20% of the present value; (3) the post-glacial climatic optimum was 2,5ÔC warmer than now; (4) the long-term variability of the record is relatively low, due to isostatic movements in the area; and (5) from 70,000 years B.P. the Greenland glacial climate alternated between two quasi-stable stages. The latter point may reflect a chaotic feature of climate. If so, climate predictions will be difficult to access.
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| 6. |
- Jonsson, B, et al.
(författare)
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Differences in fracture pattern between an urban and a rural population: a comparative population-based study in southern Sweden
- 1992
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Ingår i: Osteoporosis International. - 1433-2965. ; 2:6, s. 269-273
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Tidskriftsartikel (refereegranskat)abstract
- Differences in the incidence of hip fractures have been reported between urban and rural areas. In this population-based study the characteristics of fracture patterns between the city of Malmo and the nearby rural district of Sjobo were compared. A total of 782 individuals in Malmo and 486 in Sjobo were invited to participate. Fracture history for all invited was registered. The odds ratio for fracture was higher in Malmo, particularly for women over 70. More than half of the urban women aged 70 had a history of a fracture. A fourfold increase in fracture prevalence between the ages of 60 and 70 was observed in women in Malmo, whereas the prevalence doubled in Sjobo. The differences in fracture patterns between these two urban and rural communities may be explained by different lifestyles.
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| 8. |
- JONSSON, B
(författare)
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PREDICTION WITH A LINEAR-REGRESSION MODEL AND ERRORS IN A REGRESSOR
- 1994
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Ingår i: INTERNATIONAL JOURNAL OF FORECASTING. - : ELSEVIER SCIENCE BV. - 0169-2070. ; 10:4, s. 549-555
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The subject under study is prediction with a simple linear regression model in the presence of errors in variables. The paper focuses on the case of a non-stochastic true regressor (x). For a wide range of true x-values around the mean of x in the estimat
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| 9. |
- JONSSON, B
(författare)
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SAMPLE-BASED PROPORTIONS AS VALUES ON A REGRESSOR
- 1994
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Ingår i: STATISTICIAN. - : BLACKWELL PUBL LTD. - 0039-0526. ; 43:4, s. 571-583
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Proportions estimated from surveys are sometimes used as values of a regressor. This paper examines the effect of the sample errors in such a regressor when estimating the slope parameter in a simple linear regression model. It is found that the bias for
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| 10. |
- Jonsson, Mikael, et al.
(författare)
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Experimentally determined deformations and stresses in narrow gap and single-U multi-pass butt-welded pipes
- 1991
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Ingår i: Proceedings of the 10th International Conference on Offshore Mechanics and Arctic Engineering, 1991. - New York : American Society of Mechanical Engineers. - 0791807193 ; , s. 17-24
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Konferensbidrag (refereegranskat)abstract
- Multi-pass butt-welding of thick walled pipes is studied. Two different groove shapes are used, single-U and narrow gap groove. Strains have been measured on both the pipe outer and inner surfaces during and after welding. Residual stresses and radial deflections have been measured on the outer surface after welding. The measured quantities are compared and discussed for the two different groove shapes. Residual stresses at the weld center and radial deflections were somewhat larger for the narrow gap groove. Furthermore, the residual stress fields for both grooves were found to be rotationally nonsymmetric. The experimentally obtained residual stresses and radial deflections are compared with corresponding analytical and empirical results based on methods from the literature and with numerical results for the same pipe from a separate study. Deviations between the measurements (on OX524D) and the results from the literature are discussed.
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