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  • 1990-1994  (4)
  • 1992  (2)
  • 1991  (2)
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  • 1990-1994  (4)
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Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Secondary cavitation due to interaction of a collapsing bubble with a rising free surface (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 274-276 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experimental investigation was made of the motion of a cavitation bubble in the vicinity of a free surface in order to study an induced secondary cavitation during the bubble rebound. A bubble was produced by focusing a ruby laser into water, and its subsequent behavior was observed with a high-speed camera. The deformable nature of both a bubble and a free surface becomes significant as the mutual distance between them is decreased. Immediately after bubble rebound, a secondary cavitation occurs at around zero dynamic pressure region which is developed in water between a rising free surface and a collapsing bubble, due to the local pressure reduction mainly caused by the interaction of expansion waves originated from the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105619
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of staurosporine, PMA and A23187 on human melanocyte cultures with dibutyryl cyclic AMP (1992)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 126 (1992), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Staurosporine, a protein kinase (PK) inhibitor, phorbol-12-myristate-13-acetate (PMA), a PKC activator and A23187 calcium ionophore were added to human melanocyte cultures with or without dibutyryl cyclic AMP (dbcAMP). After 2 days' incubation, changes in various melanogenic factors were examined such as tyrosinase activity and the amount of tyrosinase-related protein (TRP) as well as the morphology of the melanocytes, dbcAMP stimulated all the melanogenic factors. Staurosporine increased tyrosinase activity and amount of TRP and caused morphological changes with the formation of numerous dendrites, regardless of the presence of dbcAMP. In contrast, PMA did not significantly affect tyrosinase activity, TRP content or dendrite formation, with or without dbcAMP. The effects of staurosporine on tyrosinase activity and TRP content were completely inhibited by PMA, but PMA did not significantly affect the staurosporine-induced morphological changes. A23187 inhibited both tyrosinase activity and TRP content, regardless of the presence of dbcAMP, but did not affect the morphology of melanocytes. These findings suggest that tyrosinase activity and TRP content are regulated by adenylate cyclase and Ca2+ and partly by PKC, while the morphological features of melanocytes are affected by intracellular cAMP accumulation and by the inhibition of PKC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1992.tb07807.x
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Mechanism of Calcium Ionophore and Phorbol Ester-Induced T-cell Activation (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 33 (1991), S. 0 
    Details
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We examined (he role of monocytes in T-cell activation induced by phorbol myristate acetate (PMA) and calcium ionophore ionomycin. Depletion of monocytes from peripheral blood mononuclear cells (PBMC) was associated with the loss of inlerleukin-2 (IL-2) production, IL-2 receptor (1L-2 RI expression and proliferation, in response to cither PMA or ionomycin. Addition of monocytes to highly purified T cells resulted in the complete R-constitution of IL-2 production. 1L-2R expression and proliferation by PMA-stimulated lymphocytes. Exogenous IL-2, but not interleukin-l (IL-l), could reconstitute the T-cell responsiveness. Addition of monocytes to highly purified T cells stimulated with ionomycin resulted in partial reconstitution of IL-2 production. II,-2R expression and proliferation. Similarly, (he addition of exogenous lL-2 to ionomycin-stimulated T cells only partially reconstituted the response compared with PBMC, These results suggest that monocyte-T-cell interactions contribute to IL-2 production and IL-2R expression and are crucial events for PMA-induced T-cell proliferation. With ionomycin, monocytes play a role, in part, in inducing IL-2 production, IL-2R expression and proliferation. However, IL-2 is not a sufficient signal to induce T-cell proliferative response lo ionomycin, suggesting that an IL-2-independent mechanism may exist in ionomycin-induced T-cell proliferation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3083.1991.tb01787.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Near-infrared photorefractivity in Cr-doped potassium sodium strontium barium niobate single crystal (1992)
    Springer
    Applied physics 55 (1992), S. 61-64 
    Details
    ISSN: 1432-0630
    Keywords: 42.65 ; 42.70 ; 72.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We report on the photorefractive properties of a Cr-doped (K1−x Na x )2A−2 (Sr y Ba1−y )2−A Nb10O30 (x=0.586, y=0.659, A=1.12) single crystal in the near-infrared spectrum. The sample exhibits photorefractivity for wavelengths up to at least 840 nm where the steady-state two-beam coupling gain is found to be larger than 2 cm−1. Photorefractive gain and decay rate are measured as a function of wavelength, grating spacing and intensity. The wavelength dependence of gain fluctuations in two-beam coupling are also measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324603
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    Paper (German National Licenses)
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