170,991 research outputs found
Using mathematical models to help understand biological pattern formation
No full textOne of the characteristics of biological systems is their ability to produce and sustain spatial and spatio-temporal pattern. Elucidating the underlying mechanisms responsible for this phenomenon has been the goal of much experimental and theoretical research. This paper illustrates this area of research by presenting some of the mathematical models that have been proposed to account for pattern formation in biology and considering their implications.To cite this article: P.K. Maini, C. R. Biologies 327 (2004)
Gli investimenti delle casse di previdenza in Italia: caratteristiche, profili di rischiosità, rendimenti. Un'analisi degli asset immobiliari
No full textMechanism of oxidation of alkylaromatic compounds by metal ions. 4. Cerium(IV) pyridinium chloride. A novel reagent for side-chain oxidation of highly substituted methylbenzenes ( Note )
No full textPredation upon Adalia bipunctata and Harmonia axyridis eggs by Chrysoperla carnea larvae and Orius laevigatus adults
No full textIntra-guild predation (IGP) between sucking predators in relation to eggs of the exotic ladybird Harmonia axyridis (Pallas) and native Adalia bipunctata (L.) (Coleoptera Coccinellidae) was studied in laboratory. The green lacewing Chrysoperla carnea (Stephens) (Neuroptera Chrysopidae) and the pirate bug Orius laevigatus (Fieber) (Rhynchota Anthocoridae) may share the same niche as the two Coccinellidae species. Intra-guild predation may occur in glasshouses and crops when several predator species are used in integrated releases for the biocontrol of arthropod pests. In experimental arenas, the two sucking predators were individually offered the choice between eggs of the two ladybird species. Adult O. laevigatus reared on frozen Ephestia kuehniella Zeller eggs were not seen to feed on ladybird eggs, and immediately rejected this kind of food. Conversely, C. carnea larvae attacked the ladybird eggs without showing a preference for either species, although we observed that the A. bipunctata eggs were either completely eaten or more shrivelled than those of H. axyridis. In prey suitability experiments, C. carnea larvae that were allowed to develop by being fed an ad libitum supply of A. bipunctata eggs took longer to develop and had a lower survivorship compared to data (from literature) on E. kuehniella frozen eggs. H. axyridis eggs were not suitable for the larval development of C. carnea. We discuss the relevance of these results and intra-guild predation to the use of these species as biocontrol agent
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