| 1. |
- Antzutkin, Oleg, et al.
(författare)
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Molecular motion of the Morpholin-1-yl radical in CF2 ClCFCl2 as studied by ESR : use of residual anisotrophy of powder spectra to extract dynamics
- 1993
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Ingår i: Chemical Physics. - 0301-0104 .- 1873-4421. ; 169:2, s. 195-205
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Tidskriftsartikel (refereegranskat)abstract
- The dynamics of the deprotonated neutral morpholin-1-yl radical, trapped in a halocarbon matrix, CF2ClCFCl2, has been studied utilizing electron spin resonance (ESR) spectroscopy. The experimental lineshapes of the radical exhibit an alterating line-width effect in the temperature range 105-144 K. The major changes of the ESR lineshape were governed by the averaging of the nitrogen hyperfine anisotropy while no exchange of the isotropic hyperfine coupling constants was observed. Geometrical parameters specifying the restricted anisotropic rotation of the whole radical trapped in the matrix could be extracted. Two methods for simulating anisotropic exchange broadened ESR spectra, the secular and non-perturbative, were utilized to investigate the dynamics of the radical. A surprisingly simple ''three-site'' jump model with a barrier of almost-equal-to 3.6 kcal/mol can be applied in the simulation of the experimental spectra. It has been shown that the secular method cannot reproduce the exchange broadened ESR spectra of systems with large hyperfine anisotropy undergoing large internal reorganisation.
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| 2. |
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| 3. |
- Antzutkin, Oleg, et al.
(författare)
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Optically dectected ESR (OD-ESR) of iron-radical pairs in colored solutions : observation of transient trans-Azobenzene radical cation
- 1993
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Ingår i: Applied Magnetic Resonance. - : Springer- Verlag. - 0937-9347 .- 1613-7507. ; 5:1, s. 77-86
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Tidskriftsartikel (refereegranskat)abstract
- Trans-azobenzene dissolved in different liquid hydrocarbons absorbs fluorescence arising from all acceptors previously used in Fluorescence Detected Magnetic Resonance (FDMR) and Optically Detected ESR (OD ESR) spectroscopy making optical detection impossible. In this report a new acceptor, rubrene, having sufficient quantum yield of fluorescence in the red band 550-620 nm, has been proven successful. OD ESR spectra of the radical-ion pair trans-azobenzene+/rubrene- were detected in liquid squalane (2,6,10,15,19,23-hexamethyl-tetracosane) solution in the temperature range 294-243 K. The experimental isotropic hyperfine splittings of the radical cation of trans-azobenzene (a(N) = 1.4 mT) have been compared with those from MNDO/INDO calculations and with those of earlier work using freon matrix studies.
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| 4. |
- Elvin, A, et al.
(författare)
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Ultrasound guided biopsies of neuroendocrine metastases : Comparison of 0.9 and 1.2 mm biopsy-gun needle biopsies
- 1993
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Ingår i: Acta Radiologica. - 0284-1851 .- 1600-0455. ; 34:5, s. 474-477
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Tidskriftsartikel (refereegranskat)abstract
- Twenty-five patients with known neuroendocrine tumour disease were biopsied with 1.2 mm and 0.9 mm biopsy-gun needles to evaluate the respective diagnostic accuracy of the 2 needle sizes. The influence of treatment-related fibrosis on the histopathological diagnosis was also evaluated. The overall diagnostic accuracy with the 0.9 mm needle was 69% as compared to 92% with the 1.2 mm needle. This difference, however, seems more related to needle guiding difficulties with the 0.9 mm needle than to insufficient tissue yield. When the tumour was hit with both the 0.9 and the 1.2 mm needle the tissue yield was inferior with the 0.9 mm needle in only one of 16 cases. The increased amount of fibrous tissue due to interferon treatment did not seem to negatively influence the diagnostic accuracy.
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| 5. |
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| 6. |
- Lindgren, A-C, et al.
(författare)
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Normal vaginal delivery is to be recommended for haemophilia carrier gravidae
- 1994
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Ingår i: Acta Paediatrica, International Journal of Paediatrics. - : Wiley. - 0803-5253. ; 83:6, s. 609-611
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Tidskriftsartikel (refereegranskat)abstract
- Every child with severe or moderate haemophilia A or B, born in Sweden during the period 1970-1990, was traced in the national haemophilia register, all 117 case records being surveyed for mode of delivery and perinatal complications. Of the 117 deliveries. 13 were by caesarean section and the remaining 104 vaginal. Of the 13 caesarean sections, 2 were performed because the woman was a haemophilia carrier the remaining 11 (5 emergency, 6 elective) for other reasons. Neonatal complications were: subgaleal or cephalic haematoma (n = 12), intracranial haemorrhage (n = 4), umbilical bleeding (n = 4), haematuria (n = 1), retro-orbital bleeding (n = 1) and abnormal bleeding after surgery. injection or venepuncture (n = 28). Of the 12 infants with subgaleal/cephalic haematoma, 10 were delivered by vacuum extraction. Seven more infants were delivered by vacuum extraction and another 11 were born without abnormal bleedings after laborious (> 24 h) delivery. Of the 4 children with intracranial haemorrhage, all were sporadic cases of haemophilia, 1 was a premature birth by caesarean section in the 27th week, 1 was delivered by vacuum extraction and the remaining 2 vaginally. In these 4 cases there were no sequelae or only minor ones. We conclude that the risk of serious bleeding in conjunction with normal vaginal delivery is small, but that vacuum extraction should be avoided when delivering offspring of haemophilia carriers.
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| 7. |
- Lindgren, A, et al.
(författare)
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Plasma lipids and lipoproteins in subtypes of stroke
- 1992
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Ingår i: Acta Neurologica Scandinavica. - 1600-0404. ; 86:6, s. 572-578
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Tidskriftsartikel (refereegranskat)abstract
- We determined plasma lipid and lipoprotein concentrations in 131 patients (95 males, 36 females, mean age 71 years) 6 months after acute stroke onset. Compared to a reference population, the alterations of plasma lipid concentrations in stroke patients were moderate. However, the stroke patients had higher levels of triglyceride and lipoprotein (a) and lower concentrations of cholesterol, high density lipoprotein cholesterol and low density lipoprotein cholesterol. Patients with different subtypes of stroke showed significant differences when compared with each other by analysis of covariance (with adjustment for age, sex, smoking, hypertension and diabetes). Patients with carotid or vertebral artery disease had the higher levels of cholesterol, triglyceride and apolipoprotein B, whereas high density lipoprotein triglyceride concentrations were higher in patients with cardioembolic infarcts.
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| 8. |
- Lindgren, Lars-Erik, et al.
(författare)
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An improved two-dimensional model of flame cutting
- 1993
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Ingår i: COMMP '93. - Tokyo : ISIJ. ; , s. 141-146
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Konferensbidrag (refereegranskat)abstract
- Flame-cutting of a large plate is simulated. Neglecting the heat flow in the cutting direction makes it possible to use a two-dimensional finite element method. A cross-section transverse to the cutting direction is modelled. Three different assumptions regarding the normal strain in the cutting direction are compared. They are called plane strain, generalized plane strain and plane deformation. They all give residual stresses that agree well with measurements. The plane deformation assumptions improve this agreement to achieve a low computational cost.
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| 9. |
- Lindgren, Lars-Erik, et al.
(författare)
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Computational model of flame-cutting
- 1993
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Ingår i: Journal of engineering materials and technology. - : ASME International. - 0094-4289 .- 1528-8889. ; 115:4, s. 440-445
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Tidskriftsartikel (refereegranskat)abstract
- A computational model for simulation of flame-cutting has been developed. Two different cutting conditions are compared with respect to the residual stresses. The first case is a plate cut at room temperature and the other is the cutting of a preheated plate. The model depends on measured micro-structure to estimate the required heat input. The model is verified by comparing the calculations for the preheated plate with experimentally obtained residual stresses. Lower residual stresses in the preheated plate prevents subsequent cracking
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| 10. |
- Ljung, R., et al.
(författare)
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Implantable central venous catheter facilitates prophylactic treatment in children with haemophilia
- 1992
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Ingår i: Acta Paediatrica, International Journal of Paediatrics. - : Wiley. - 0803-5253. ; 81:11, s. 918-920
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Tidskriftsartikel (refereegranskat)abstract
- Twelve children with a severe form of haemophilia A received a totally implantable venous access system (Port-A-Cath) to facilitate regular prophylactic treatment with factor VIII. The indication for implantation was difficulty in obtaining regular access to a peripheral vein. Postoperative bleeding around the portal site occurred in two of 12 cases. After a median duration of follow-up of 26 months (range 5-79 months), one of the systems had needed replacement due to bleeding, septicaemia or thrombosis. One child, with an inhibitor against factor VIII, had an infection at the portal site and this system was removed. None of the other children had any serious side effects. Nine of the 12 children's parents learned how to use the Port-A-Cath system, thus enabling optimal prophylactic home treatment with factor VIII to be begun early in life.
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