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Träfflista för sökning "WFRF:(Saito A.) srt2:(1998-1999)"

Sökning: WFRF:(Saito A.) > (1998-1999)

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  • Saito, A, et al. (författare)
  • Conjugate observations of the mid-latitude electric field fluctuations with the MU radar and the Freja satellite
  • 1998
  • Ingår i: Journal of Atmospheric and Solar-Terrestrial Physics. - 1364-6826 .- 1879-1824. ; 60:1, s. 129-140
  • Tidskriftsartikel (refereegranskat)abstract
    • Conjugate Freja satellite and MU radar observations were conducted from 1993 to 1995 to clarify the generation mechanism of mid-latitude electric field fluctuations (MEFs) which were found from DE-2 satellite observations. The detection of MEFs at higher altitudes than 1000 km by the Freja satellite confirms that the MEFs are transmitted along the geomagnetic held line without any significant damping. On one night of such conjugate observations, MEFs were observed in a traveling ionospheric disturbance (TID). On the other nights when the MEFs were observed by Freja, large scale density structures in the ionosphere were observed with the MU radar. Spread-F phenomena were also observed by ionosondes associated with these structures. The large scale modulation of the ionosphere, such as TIDs, might cause small scale modulations which grow through ionospheric instabilities. The linear growth rate is evaluated using a set of equations describing the growth of the mid-latitude ionospheric irregularities. The growth rate is shown to be too small under average conditions; however, when the neutral wind in TIDs is included, it is large enough to generate MEFs. (C) 1998 Elsevier Science Ltd. All rights reserved.
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  • Tamura, K, et al. (författare)
  • Fibronectin stimulates transcription of the platelet-derived growth factor beta-receptor in cultured rat aortic smooth muscle cells.
  • 1998
  • Ingår i: Biochemical and biophysical research communications. - : Elsevier BV. - 0006-291X. ; 251:3, s. 677-80
  • Tidskriftsartikel (refereegranskat)abstract
    • Fibronectin seems to play an important role in promoting the characteristic changes of vascular smooth muscle cells in diabetes mellitus including overexpression of the platelet-derived growth factor beta-receptor. To determine the regulatory mechanism of the beta-receptor by fibronectin, we have analyzed the effect of fibronectin on the expression of the beta-receptor in cultured rat aortic smooth muscle cells using the beta-receptor promoter/luciferase expression vector system. Fibronectin was found to stimulate the expression of the beta-receptor at the transcriptional level. Both a MEK1 inhibitor PD98059 and a tyrosine kinase inhibitor herbimycin A significantly inhibited the fibronectin-stimulated receptor transcription. Herbimycin A also completely inhibited the fibronectin-stimulated increase in tyrosine phosphorylation of focal adhesion kinase. These data suggest the involvement of the integrin-mediated mitogen-activated protein kinase pathway downstream of fibronectin stimulation in the activation process of the beta-receptor promoter.
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  • Resultat 1-6 av 6

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