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  • Exitpressure  (1)
  • strain competitiveness  (1)
  • 1
    Electronic Resource
    Electronic Resource
    An experimental study of exit pressures for polymer melts (1990)
    Springer
    Rheologica acta 29 (1990), S. 60-70 
    Details
    ISSN: 1435-1528
    Keywords: Exitpressure ; first normalstress difference ; viscosity ; polymermelts ; slitdie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract A slit die apparatus is used to measure exit pressures for five different polymer melts. Viscosity data obtained from the same apparatus agree well with values obtained from a cone-and-plate rheometer or a capillary rheometer. Except for a PVC sample where thermal degradation was found to occur, the exit pressures obtained by linear extrapolation of the measured pressure profiles are all positive, and increase with increasing shear stress. The values of the first normal stress difference calculated according to the exit pressure theory are of the right order of magnitude and in some cases correlate satisfactorily with values measured in a cone-and-plate rheometer. However, the high sensitivity of the exit pressure values to the method of extrapolation and the wild scatter of exit pressure data for some materials make it difficult to use the exit pressure method as a routine procedure for accurate determination of the first normal stress difference.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01331801
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Genistein preincubation of Bradyrhizobium japonicum cells improves strain competitiveness under greenhouse, but not field conditions (2000)
    Springer
    Plant and soil 223 (2000), S. 231-236 
    Details
    ISSN: 1573-5036
    Keywords: Bradyrhizobium japonicum ; genistein ; soybean ; strain competitiveness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In the soybean-B. japonicum symbiosis, genistein has been identified as one of the major compounds in soybean seed and root exudates responsible for inducing expression of the B. japonicum nodYABC operon. In this study, we have tested the possibility that genistein treatment prior to inoculation can increase the competitiveness of the treated B. japonicum strain under both greenhouse and field conditions. Two mutants of the two B. japonicum strains each with a different antibiotic resistant marker were selected. They were tested with one or the other treated with genistein. The results showed genistein treated mutants had higher levels of nodule occupancy than the untreated mutant or parent strain under greenhouse conditions. Mutants from 532C had higher nodule occupancies than mutants from USDA110, especially at 15 °C. In the more complex field environment, genistein treated mutants formed fewer nodules than the untreated mutants. The contradictory results of strain competitiveness for greenhouse and field experiments are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004880305826
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    Paper (German National Licenses)
    Fulltext
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