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  • Articles: DFG German National Licenses  (3)
  • Kinetic theory  (2)
  • B. campestris B. napus  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Comparison of feeding behaviour of two Brassica pests Brevicoryne brassicae and Myzus persicae on wild and cultivated brassica species (1997)
    Springer
    Entomologia experimentalis et applicata 85 (1997), S. 135-143 
    Details
    ISSN: 1570-7458
    Keywords: Brevicoryne brassicae ; Myzus persicae ; Brassica juncea ; B. nigra ; B. carinata ; B. macrocarpa ; B. villosa var. drepanensis ; B. oleracea ; B. campestris B. napus ; B. rapa ; host-plant resistance ; electronic monitoring
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Feeding behaviour of the specialist Brassicae aphid, Brevicoryne brassicae (L) (cabbage aphid) and the generalist, Myzus persicae, (Sulzer) (peach potato aphid) was monitored electronically on the susceptible cauliflower, Brassica oleracea var. botrytis cv Newton Seale, and a range of 17 Brassica species, B. carinata, B. juncea, B. nigra, B. macrocarpa, and B. villosa var. drepanensis and cultivated brassica varieties, B. oleracea, B. campestris and B. napus. Aphids, monitored for 10 h on the underside of leaves, performed recognisable feeding behaviour on all brassica species. The main differences in feeding behaviour, between M. persicae and B. brassicae, on the susceptible cauliflower Newton Seale, were fewer probes, shorter times to initially reach the phloem but longer times to establish sustained phloem ingestion and the longer times spent, by M. persicae, in xylem ingestion. Feeding behaviour on the range of brassica species tested indicated that generalist and specialist aphids are influenced differently by the host plant. A longer time spent in xylem ingestion was again the major difference in the feeding behaviour of the two aphids. In addition, rejection of passive phloem ingestion, by M. persicae, was not related so closely to increased time spent in non probing activities, as for B. brassicae. This observation indicates that M. persicae does not generally accept or reject brassica species due to the presence of phagostimulants, such as glucosinolates at the leaf surface or along the stylet pathway, unless the concentration is very high. Differences in feeding strategies employed by generalist and specialist aphids on the same plants are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003188103050
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The Enskog repeated ring equations for tagged molecule motion and variational solutions (1988)
    Springer
    Journal of statistical physics 51 (1988), S. 249-273 
    Details
    ISSN: 1572-9613
    Keywords: Kinetic theory ; Enskog repeated ring equation ; polyatomic liquids ; variational principles ; Lorentz model ; kinetic boundary layers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Enskog repeated ring equations (ERRE) for tagged molecule motion are derived from the BBGKY hierarchy. The hierarchical deviation demonstrates the problem associated with using naive truncations for complex fluid systems. A moment-variational solution is suggested for the ERRE. The moment-variational method is applied to the ERRE for the two- and three-dimensional overlapping Lorentz gas (LG). Both self-consistent and non-self-consistent equations for the diffusion constant are solved. The results compare favorably with previous calculations and molecular dynamics (MD).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01015330
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The velocity correlation function for the Lorentz gas (1988)
    Springer
    Journal of statistical physics 51 (1988), S. 275-289 
    Details
    ISSN: 1572-9613
    Keywords: Kinetic theory ; random media ; Lorentz model ; self-consistent repeated ring theory ; long-time tails
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The results of variational solutions of the repeated ring and self-consistent repeated ring equations for the two-and three-dimensional overlapping Lorentz gas (LG), as formulated in a previous report, are presented. Calculations of the full velocity correlation function (VCF) for the 2D LG, including long-time tails, are compared with those from molecular dynamics. The trial functions chosen lead to predictions for the long-time tails that improve as the density of the scatterers is increased. At a value of 0.24 forρ* (=ρσ 2, whereρ is the density and σ the radius of scatterers), the self-consistent amplitudes of the long-time tail are within 40% of the molecular dynamics. A limited number of 3D results for the short-time behavior of the repeated ring VCF are presented. The 3D solutions agree with the molecular dynamics to within 10%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01015331
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    Paper (German National Licenses)
    Fulltext
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