ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Springer  (4)
  • American Geophysical Union
  • 1990-1994  (4)
Collection
Publisher
Years
Year
  • 1
    Publication Date: 1993-08-01
    Print ISSN: 0377-9017
    Electronic ISSN: 1573-0530
    Topics: Mathematics , Physics
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'électrophorèse sur gel de polyacrylamide a servi à déterminer l'importance du parasitisme de populations naturelles de S. avenae F. Des clés électrophorétiques, préparées à partir de parasitoïdes élevés au laboratoire, ont été utilisées pour identifier les parasitoïdes provenant des pucerons récoltés dans la nature. Ainsi ont été décelés les parasites primaires: Aphidius rhopalosiphi De Stefani Perez, A. ervi Haliday, A. picipes Nees, Praon volucre Haliday, Ephedrus plagiator Nees et Aphelinus abdominalis Dalman. Quelques bandes non-identifiées devraient être attribuées à des hyperparasitoïdes. L'électrophorèse a été comparée aux techniques d'échantillonnage plus conventionnelles de décompte des momies et d'élevage des individus vivants utilisées pour estimer le taux de parasitisme. L'électrophorèse et les méthodes d'élevage donnent généralement des résultats semblables pour les 2 niveaux de parasitisme et la composition en espèces de parasitoïdes, tandis que le décompte des momies tend à donner des résultats inférieurs.
    Notes: Abstract Polyacrylamide gel electrophoresis was used to monitor levels of parasitism in field populations of the cereal aphid, Sitobion avenae (F.) (Hemiptera: Aphididae). Electrophoretic keys previously prepared from laboratory-reared parasitoids were used to identify parasitoids within field-collected aphids. Using this approach, the primary parasitoids Aphidius rhopalosiphi De Stefani Perez, Aphidius ervi (Haliday), Aphidius picipes (Nees), Praon volucre Haliday, Ephedrus plagiator Nees and Aphelinus abdominalis Dalman were detected. Some unidentified banding patterns were also obtained, most of which were probably attributable to the presence of hyperparasitoids. Electrophoresis was compared with the more conventional sampling techniques of live-rearing and mummy counts as a means of estimating percentage parasitism. Electrophoresis was found to be a much quicker method than live-rearing and gave similar results for both levels of parasitism and parasitoid species composition, whereas mummy counts tended to give lower estimates than the other two methods.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Letters in mathematical physics 28 (1993), S. 257-268 
    ISSN: 1573-0530
    Keywords: 81-XX
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We present a general scheme for describing $$\widehat{su}$$ (N) k fusion rules in terms of elementary couplings, using Berenstein-Zelevinsky triangles. A fusion coupling is characterized by its corresponding tensor product coupling (i.e. its Berenstein-Zelevinsky triangle) and the threshold level at which it first appears. We show that a closed expression for this threshold level is encoded in the Berenstein-Zelevinsky triangle and an explicit method to calculate it is presented. In this way, a complete solution of $$\widehat{su}$$ (4) k fusion rules is obtained.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    BioControl 37 (1992), S. 565-574 
    ISSN: 1573-8248
    Keywords: Parasitoids ; host-feeding ; nectar ; pollen ; honeydew ; parasitoïde ; adulte ; régime alimentaire
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Malgré l'importance potentielle de la nutrition des adultes dans l'écologie des parasitoïdes, les connaissances relatives à la gamme d'aliments naturels qu'ils exploitent restent limitées à un petit nombre d'espèces. Nous donnons ici quelques indications simples pour déterminer l'étendue du régime alimentaire chez les parasitoïdes adultes, pour faciliter et en même temps encourager une recherche ultérieure sur cet aspect de la biologie des parasitoïdes.
    Notes: Abstract Despite the potential importance of adult nutrition in the ecology of parasitoids, information on the range of natural foods they exploit is confined to a relatively small number of species. We provide some simple guidelines for determining dietary range in adult parasitoids, both to facilitate and to encourage further research into this aspect of parasitoid biology.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...