| 1. |
- Andersson, J, et al.
(författare)
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Experimental and Theoretical Investigation of the Kinetics of the Sorption of Water Vapour by Silica Gel
- 1985
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Ingår i: Journal of the Chemical Society, Faraday Transactions 1: Physcal Chemistry in Condensed Phases. ; 81, s. 2681-2692
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Tidskriftsartikel (refereegranskat)abstract
- The kinetics and mechanism of the sorption reaction between water vapour and silica gel have been investigated in the pressure range 1–50 Torr using thermogravimetry under controlled temperature and water-vapour pressure. Measurements at equilibrium were carried out in order to determine the pertinent equilibrium parameters and the extent of hysteresis. The influence of particle radius and temperature on the kinetics in the whole of the pressure range investigated are well described by theoretical curves fitted to experimental data by taking into account simultaneous mass- and heat-transfer. Calculations yield a diffusivity of 8 × 10–10 m2 s–1. The sorption kinetics in the pressure range 15–40 Torr are shown to be controlled by heat transfer.
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| 3. |
- Dohlsten, M, et al.
(författare)
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Lymphocyte subpopulations and lymphokine production in children with constitutional aplastic anemia
- 1988
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Ingår i: Pediatric Hematology & Oncology. - : Informa UK Limited. - 1521-0669 .- 0888-0018. ; 5:2, s. 143-151
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Tidskriftsartikel (refereegranskat)abstract
- The expression of lymphocyte surface markers as well as the production of interleukin-2 (IL-2) and interferon-gamma (IFN) by mitogen-stimulated peripheral blood mononuclear cells (MNC) have been studied in five children with constitutional aplastic anemia. A significantly reduced T4/T8 ratio was found and two of five patients also had a reduced percentage of B cells. One patient had a high percentage of HLA-DR positive T8+ cells, very suggestive of a high degree of circulating activated T suppressor/cytotoxic cells. IL-2 production was reduced in two patients, whereas IFN production was only reduced in one of these. The abnormalities found correlate with the duration of the bone marrow failure. The patients with the longest duration of bone marrow failure also exhibited the lowest T4/T8 ratio. No spontaneous IFN production was detected in any of the patients. There was no clinical benefit or reversal of the immune abnormalities during and following treatment with cimetidine and cyclosporine A in two patients.
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| 4. |
- Harms-Ringdahl, K, et al.
(författare)
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Pain assessment with different intensity scales in response to loading of joint structures.
- 1986
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Ingår i: Pain. - 0304-3959. ; 27:3, s. 401-11
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of the present study was to compare intensity levels assessed on Borg's Category Scale for Ratings of Perceived Pain (BRPP) (1982) (a verbal scale using adjectives and adverbs combined with the numbers 0-10), with assessments on the Visual Analogue Scale (VAS) (a 10 cm horizontal line). Eight healthy subjects volunteered in an experimental study, where pain was provoked by load on passive soft tissue elbow joint structures. Each subject participated 4 times on different occasions in the same experimental set-up, which was divided into six 2 min periods; 3 periods with load induced by applied external weights causing load moments of 3.4 Nm, 4.5 Nm and 6.8 Nm plus that induced by the weight of the lower arm and hand (average 2.9 Nm), followed by 3 periods without external weights. Each series consisted of 12 assessments given during the last 10 sec period of each minute on either the BRPP or the VAS. No significant difference was found between the first and second time a scale was used by the same subject, and none between the assessments on the VAS and the BRPP. Intensity levels of pain increased with load and time and decreased after reduction of the load moments. It is concluded that both scales can be used to reliably assess intensity levels of perceived pain elicited by loading joint structures. Intensity levels, as assessed on both scales, are associated with applied external load and time for exposure.
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| 5. |
- Hedlund, G, et al.
(författare)
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Maximal interferon-gamma production and early synthesis of interleukin-2 by CD4+ CDw29- CD45R- p80- human T lymphocytes.
- 1989
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Ingår i: Immunology. - 0019-2805. ; 66:1, s. 49-53
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Tidskriftsartikel (refereegranskat)abstract
- Functionally distinct subsets within the T-helper (CD4+) cell population have been described in man, rat and mouse. We have shown previously that the CD4+ 45R- human lymphocytes are producers of IL-2 within 24 hr of polyclonal stimulation and are the major interferon (IFN) producers. The mAbs 4B4 (CDw29) and Leu 8 (p80) are here used together with Leu-18 (CD45R) to characterize the subpopulations of the CD4+ human lymphocytes in more detail. The majority of the CD45R+ cells were CDw29- and the majority of the CDw29+ cells were CD45R-. Most of the CD45R+ cells (78%) were also p80+. A significant number of cells (12%) were CDw29- CD45R-. The predominant subpopulations were defined to be CDw29- CD45R+ p80+ (31%), CDw29+ CD45R- p80- (24%) and CDW29+ CD45R- p80+ (18%). Within the CD4+ CD45R- subpopulation different subsets vary in their capacities to produce IFN and to produce IL-2 within 24 hr after activation. CD4+ CDw29- CD45R- p80- T lymphocytes produced the largest quantities of IFN and IL-2.
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