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  • 1990-1994
  • 1975-1979
  • 1970-1974  (3)
  • 1945-1949
  • 1970  (3)
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  • 1990-1994
  • 1975-1979
  • 1970-1974  (3)
  • 1945-1949
Year
  • 1
    Electronic Resource
    Electronic Resource
    An analysis of the temperature response curves of CO2 exchange in the leaves of two temperate and one tropical grass species (1970)
    Springer
    Planta 94 (1970), S. 140-151 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The temperature dependence of carbon dioxide exchange in two temperate grass species, Lolium perenne (S.23) and Lolium multiflorum (S.22), and one tropical grass species, Cenchrus ciliaris, have been examined. It has been shown that the decline in the net CO2 exchange rate above the optimum temperature is caused, in the case of C. ciliaris, by denaturation, and, in the case of L. perenne and L. multiforum by the greater response to temperature of respiration compared with photosynthesis. Activation energies have been obtained for both photosynthetic and respiratory systems. For both systems the values fall into discrete groups, and it is postulated that each group may be characteristic of a particular rate-limiting process. The distribution of values changes with changes in experimental conditions, there being marked differences in the distribution of values obtained for light-limited and CO2-limited photosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387758
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The velocity of second sound in dilute3He-4He solutions below 0.6°K (1970)
    Springer
    Journal of low temperature physics 3 (1970), S. 619-634 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The velocity of second soundu 2 in dilute solutions of3He in4He has been measured by a pulse, time-of-flight technique using a new type of mechanical transducer. Tables of measured values ofu 2 as a function of temperature between 0.03 and 0.6° K are presented for3He concentrations in the range 0.14–6.3% at the saturated vapor pressure and under hydrostatic pressures of 10 and 20 atm. Estimates of the upper limit of the intrinsic attenuation of second sound have also been made and these are consistent with theory provided that the experimental values of the phonon thermal conductivity lifetime are used in place of the values calculated by Baym and Ebner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00628338
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Initiation of thermal convection in finite right circular cylinders (1970)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 16 (1970), S. 594-601 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Linear perturbation analyses are extended to determine the lowest Rayleigh number at which convection initiates in a vertical cylinder heated on the bottom and cooled on the top. The critical Rayleigh number for the first mode of convection in a right circular cylinder with a perfectly conducting wall is shown to be three times larger than that in such a cell with a perfectly adiabatic side wall. An adjusted wave number is shown to make the results of Pellew and Southwell applicable to the adiabatic wall in a manner similar to that used by Pnueli and Ostrach for the perfectly conducting side wall. The results are compared with experiment and are in very good agreement.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690160415
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    Paper (German National Licenses)
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