| 1. |
- Digby, Peter J., et al.
(författare)
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Finite element simulation of time dependent fracture and fragmentation processes in rock blasting
- 1985
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Ingår i: International Journal for Numerical and Analytical Methods in Geomechanics. - : Wiley. - 0363-9061 .- 1096-9853. ; 9:4, s. 317-329
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Tidskriftsartikel (refereegranskat)abstract
- Two constitutive models for the simulation of fracture and fragmentation processes in rapidly loaded rocks are studied. The models were included in a wave propagation finite element code. The results obtained from the two models were compared by a study of the intensity and extent of fracturing obtained from two different configurations of explosive charge and reflecting surfaces in a plane strain problem. The evolution of the time dependent fracture pattern and fragmentation process is also presented.
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| 2. |
- Fagher, B, et al.
(författare)
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L-carnitine and haemodialysis: double blind study on muscle function and metabolism and peripheral nerve function
- 1985
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Ingår i: Scandinavian Journal of Clinical & Laboratory Investigation. - 1502-7686. ; 45:2, s. 169-178
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Tidskriftsartikel (refereegranskat)abstract
- Twenty-eight haemodialysis patients were randomized to L-carnitine, 2 g i.v. three times a week, and saline over a 6-week period. No obvious deficiency of carnitine was found in vastus lateralis with a median value of 12.9 mmol/kg dry weight; range 6.2-21.4. Female patients had lower total plasma carnitine compared to female controls, p less than 0.002, whereas no decrease was found in males. No relationship was found between muscle and total plasma carnitine. After carnitine administration the muscle carnitine level increased about 60%, p less than 0.01, and the total plasma carnitine level more than tenfold, whereas the initially high degree of acylation decreased, p less than 0.02. Maximum dynamic muscular strength was reduced with a mean value of 44% compared with healthy controls. Total metabolic activity of isolated skeletal muscle fibres, measured as heat production with a new technique using a perfusion microcalorimeter, showed a median value of 0.40 mW/g, 25% lower than normal, p less than 0.02. Carnitine administration had no effect on several different tests of muscular function. Neurophysiologically, discrete improvements in the temperature responses were recorded, but no changes in sensory and motor nerve conduction velocities or in vibration thresholds were noted. No symptomatic improvement was observed even in patients with the lowest carnitine levels prior to treatment. Our data do not support the hypothesis that carnitine deficiency contributes to muscle and nerve dysfunction in patients on chronic haemodialysis.
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| 3. |
- Hansson, P, et al.
(författare)
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Hepatic lipase activity increases after liver denervation in the rat
- 1985
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Ingår i: Biochimica et Biophysica Acta. - 0006-3002. ; 833:2, s. 351-353
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Tidskriftsartikel (refereegranskat)abstract
- We have investigated the effects of hilar denervation of rat liver upon the activity of hepatic lipase determined in tissue extracts. Denervated animals had an enzyme activity of 7.89 +/- 0.37 mU/mg protein, compared to 6.45 +/- 0.43 in sham-operated controls (mean +/- S.E.; P less than 0.05). We conclude that hepatic innervation may contribute to the regulation of hepatic lipase activity.
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| 4. |
- Valdemarsson, S, et al.
(författare)
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Platelet and adipocyte thermogenesis in hypothyroid patients: a microcalorimetric study
- 1985
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Ingår i: Acta Endocrinologica. - 0001-5598. ; 108:3, s. 361-366
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Tidskriftsartikel (refereegranskat)abstract
- Direct microcalorimetry was used for measurements of heat production in cell suspensions of platelets and adipocytes, obtained from hypothyroid patients before and after 3 months on full L-thyroxine substitution. Platelet heat production was significantly lower than normal before treatment and increased in all 10 patients studied; the mean value increased from 51.3 +/- 1.6 fW/cell before to 57.1 +/- 1.8 fW/cell after therapy (P less than 0.001). Similarily, adipocyte heat production was initially significantly lower than normal and increased during treatment in all 6 patients investigated. The mean value for heat production per adipocyte was 18.8 +/- 1.7 pW/cell before and 32.4 +/- 2.5 pW/cell after therapy (P less than 0.025), which is still below the level recorded in lean healthy subjects. The adipocyte size did not change significantly. The increase in adipocyte heat production was correlated to the increase in S-triiodothyronine levels (r = 0.84, P less than 0.05). In hypothyroidism, the total metabolic activity seems to be comparatively more reduced in adipocytes than in platelets. A difference may exist between these cells with regard to recovery of normal metabolic activity during treatment for hypothyroidism. Direct microcalorimetry appears to be an adequate method for monitoring net metabolic effects of thyroid hormones in these cells.
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