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- Lindqvist, Ulla, et al.
(author)
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The diurnal variation of serum hyaluronan in health and disease
- 1988
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In: Scandinavian Journal of Clinical and Laboratory Investigation. - 0036-5513 .- 1502-7686. ; 48:8, s. 765-770
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Journal article (peer-reviewed)abstract
- The variation of the serum concentration of hyaluronan during the day and between days has been investigated. In a group of healthy volunteers, the mean hyaluronan level was very stable over time except for a moderate but significant elevation after rising from bed in the morning. Patients with rheumatoid arthritis showed markedly increased hyaluronan concentrations 0.5-2 h after leaving bed. Patients with primary biliary cirrhosis exhibited high and rather constant levels during the day. A reference group of hospitalized patients with other diseases did not show any diurnal variation. The best reproducibility in hyaluronan determinations is obtained if specimens are taken before the subjects rise from bed or a few hours later, i.e. after the morning elevation of serum hyaluronan has subsided. In rheumatoid arthritis valuable information can be obtained by repeated sampling during the morning hours.
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| 5. |
- Pedersen, A., et al.
(author)
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Quasistatic electric field measurements with spherical double probes on the GEOS and ISEE satellites
- 1984
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In: Space Science Reviews. - 0038-6308 .- 1572-9672. ; 37, s. 269-312
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Journal article (peer-reviewed)abstract
- Spherical double probes for measurements of electric fields on the GEOS-1, GEOS-2, and ISEE-1 satellites are described. An essential feature of these satellites is their conductive surfaces which eliminate errors due to differential charging and enable meaningful diagnostic experiments to be carried out. The result of these experiments is a good understanding of interactions between the plasma, the satellite and the probes, including photo-electron emission on satellite and probes. Electric field measurements are compared with measurements of plasma drift perpendicular to the magnetic field in the solar wind and the magnetosphere and the error bar for the absolute values of the electric field is found to be in the range ±(0.5-1.0) mV m-1 whereas relative variations can be determined with much better accuracy. A useful by-product from a spherical double probe system is the determination of satellite floating potential which is related to the plasma electron flux. This measurement allows high time resolution studies of boundary crossings. Examples of electric field measurements, which reflect the recent scientific results, are given for different regions of the magnetosphere from the bow shock, the inner magnetosphere and the tail. Several examples of simultaneous GEOS-ISEE observations are described. © 1984 D. Reidel Publishing Company.
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| 6. |
- Alfsen, K. H., et al.
(author)
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Electric field and plasma observations near the magnetopause and bow shock during a rapid compression.
- 1984
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In: Achievements of the International Magnetospheric Study (IMS). ; , s. 99-104
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Journal article (peer-reviewed)abstract
- A fast compressional motion of the magnetopause resulting from the interaction of an interplanetary shock and the Earth's magnetosphere is discussed. The ISEE-1 and 2 satellites were in the frontside magnetosphere before the shock. A magnetosonic wave front, the magnetopause, and the bow shock passed them in a very short time. By a combination of electric and magnetic field data it is possible to determine the magnetosonic and the magnetopause velocity. -from STAR, 23(14), 1985
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