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  • Articles  (3)
  • 25.85  (1)
  • Magnetospheric physics (magnetosphere-ionosphere interactions)  (1)
  • helix-loop-helix molecules  (1)
  • 1995-1999  (1)
  • 1990-1994  (2)
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  • Articles  (3)
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Keywords
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  • 1995-1999  (1)
  • 1990-1994  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Observations of Pc 3–4 and Pi 2 geomagnetic pulsations in the low-latitude ionosphere (1999)
    Springer
    Annales geophysicae 17 (1999), S. 1397-1410 
    Details
    ISSN: 0992-7689
    Keywords: Ionosphere (ionosphere irregularities) ; Magnetospheric physics (magnetosphere-ionosphere interactions) ; Radio science (ionospheric physics)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Day-time Pc 3–4 (≃5–60 mHz) and night-time Pi 2 (≃5–20 mHz) ULF waves propagating down through the ionosphere can cause oscillations in the Doppler shift of HF radio transmissions that are correlated with the magnetic pulsations recorded on the ground. In order to examine properties of these correlated signals, we conducted a joint HF Doppler/magnetometer experiment for two six-month intervals at a location near L = 1.8. The magnetic pulsations were best correlated with ionospheric oscillations from near the F region peak. The Doppler oscillations were in phase at two different altitudes, and their amplitude increased in proportion to the radio sounding frequency. The same results were obtained for the O- and X-mode radio signals. A surprising finding was a constant phase difference between the pulsations in the ionosphere and on the ground for all frequencies below the local field line resonance frequency, independent of season or local time. These observations have been compared with theoretical predictions of the amplitude and phase of ionospheric Doppler oscillations driven by downgoing Alfvén mode waves. Our results agree with these predictions at or very near the field line resonance frequency but not at other frequencies. We conclude that the majority of the observations, which are for pulsations below the resonant frequency, are associated with downgoing fast mode waves, and models of the wave-ionosphere interaction need to be modified accordingly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-999-1397-2
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  • 2
    Electronic Resource
    Electronic Resource
    Fission fragment distribution following antiproton absorption at rest on238U (1992)
    Springer
    The European physical journal 343 (1992), S. 73-77 
    Details
    ISSN: 1434-601X
    Keywords: 25.85 ; 13.75.C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The distribution of nuclei resulting from the annihilation of stopped antiprotons on238U has been studied by an off-line measurement of the residual radioactivity. It was found that the probability of fission exceeds 84% (68% c.l.). The charge and mass distributions of the fission products can be separated into two parts, a more frequent symmetric component originating from high energy fission (excitation energy between 100 MeV and 1 GeV) and an asymmetric component from low energy fission (excitation energy less than 40 MeV).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291600
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  • 3
    Electronic Resource
    Electronic Resource
    Bone morphogenetic protein inhibits differentiation and affects expression of helix-loop-helix regulatory molecules in myoblastic cells (1993)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 53 (1993), S. 51-60 
    Details
    ISSN: 0730-2312
    Keywords: bone morphogenetic protein ; helix-loop-helix molecules ; myogenin ; Myo D ; herculin ; myf-5 ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Bone morphogenetic protein (BMP) reproducibly induces chondrogenesis and osteogenesis when implanted into skeletal muscle. The exact identity of the cell that responds to BMP is not known. Furthermore, controversy exists regarding the possibility that myoblastic cells may transdifferentiate to chondrocytes and osteoblasts under the influence of BMP. We have therefore, undertaken studies on the effects of BMP on differentiation in L6 and C2C12 cells, two rodent myoblastic cell lines. To gain insights into the mechanisms of action of BMP, we have studied the effects of BMP on the levels of expression of the four known myogenic determination genes: myogenin, Myo D, herculin, and myf-5. BMP inhibited myogenesis in myoblastic cells. Convincing evidence of transdifferentiation of myoblasts to chondrocytes or osteoblasts was not seen. BMP inhibited the expression of all four myogenic determination genes.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240530107
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