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  • luminescence  (1)
  • vertical surface  (1)
  • 2000-2004  (1)
  • 1990-1994  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The relationship between Photosystem II intrinsic quantum yield and millisecond luminescence in thylakoids (1993)
    Springer
    Photosynthesis research 37 (1993), S. 131-138 
    Details
    ISSN: 1573-5079
    Keywords: luminescence ; Photosystem II ; quantum efficiency ; photosynthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The relationship between charge recombination at Photosystem II (PS II), as indicated by millisecond luminescence, and PS II quantum yield was studied in spinach thylakoids during electron flow to methylviologen. Under the low magnesium conditions used, a decrease in quantum yield was observed in the absence of non-photochemical excitation quenching, and therefore cannot be due to a restriction in excitation delivery to the reaction centre. It was found that the decrease of the parameter Φp, which is a measure of the intrinsic quantum yield of ‘open’ PS II centers, correlates with an increase in luminescence per ‘open’ center. The relationship between these two parameters was the same whether Φp was manipulated by dissipation of the transthylakoid pH gradient or of the electrical potential. This indicates that the mechanism by which Φp decreases depends in the same way on the two components of the protonmotive force as does the charge recombination at PS II. Calculation of the yield of luminescence with respect to the back reaction will be necessary to determine whether the charge recombination occurs at a sufficiently high rate to be directly responsible for the Φp decrease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02187471
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  • 2
    Electronic Resource
    Electronic Resource
    The Effect of Time-Periodic Surface Temperature Oscillations on Free Convection from a Vertical Surface in a Porous Medium (2000)
    Springer
    Transport in porous media 39 (2000), S. 119-130 
    Details
    ISSN: 1573-1634
    Keywords: unsteady ; natural convection ; vertical surface
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract In this paper, we consider the unsteady free convection boundary layer flow which is induced by time-periodic variations in the surface temperature of a vertical surface embedded in a porous medium. The basic steady flow is that of a power-law distribution where the surface temperature varies as the nth power of the distance from the leading edge. Small-amplitude time-periodic disturbances are added to this basic distribution. Both the low- and high-frequency limits are considered separately, and these are compared with a full numerical solution obtained by using the Keller-box method. Attention is restricted to the cases n≤1; when n=1, the flow is locally self-similar for any prescribed frequency of modulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006692124087
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