In this contribution we consider a seasonal consumer-resource system and focus on the evolution of consumer behavior. It is assumed that consumer and resource individuals live and interact during seasons of fixed lengths separated by winter periods. All individuals die at the end of the season and the size of the next generation is determined by the the consumer-resource interaction which took ...

Department of Epidemiology and Public Health, Imperial College, St Mary’s Campus Norfolk Place, London W2 1PG, U.K. Centre de Biologie et de Gestion des Populations,INRA, Campus International de Baillarguet, CS 30016 Montferriersur-Lez, 34988 Saint-Gély-du-Fesc Cedex, France School of Biological Sciences, Lyle Building, The University of Reading Whiteknights, Reading RG6 6AS, UK CEREMADE, Unive...

We examined the effects of size and spatial isolation of fens on the isozyme variability of 17 populations of Swertia perennis. This long-lived perennial is a locally abundant fen specialist in Switzerland, where wetlands have been strongly fragmented. Isozyme variability was comparable to other outcrossing plants (A = 1.53, AP(p) = 2.01, P(p) = 42.5, H(o) = 0.113, H(e) = 0.139). F statistics i...

This study investigated the volatile flavor compounds and antioxidant properties of the essential oil of chrysanthemums that was extracted from the fresh flowers of 10 taxa of Chrysanthemum morifolium from three species; namely Dendranthema morifolium (Ramat.) Yellow, Dendranthema morifolium (Ramat.) Red, Dendranthema morifolium (Ramat.) Pink, Dendranthema morifolium (Ramat.) White, Pericallis ...

W3C collection contains documents of different types. In our experiments we used only two document types: www and lists. Examples of www documents are drafts and final versions of official W3C documents, slides from presentations given by W3C members and so on. Documents of lists type are e-mails. We split www documents into parts, based on 1000 word long segments and considered every part as a...

The whitefly Bemisia tabaci is a genetically diverse complex with multiple cryptic species, and some are the most destructive invasive pests of many ornamentals and crops worldwide. Encarsia sophia is an autoparasitoid wasp that demonstrated high efficiency as bio-control agent of whiteflies. However, the immune mechanism of B. tabaci parasitization by E. sophia is unknown. In order to investig...

The Bulletin for March, 1944, in connection with the Museum's exhibition of reproductions of mosaics uncovered by the Byzantine Institute, published an article by Professor Charles Rufus Morey on the mosaics of Hagia Sophia. The following paper, read in Mr. Whittemore's absence at a recent symposium of Byzantine scholars held at Dumbarton Oaks, deals with some problems brought out in "this char...

Knowledge base systems have not captured the wide audience enjoyed by database management systems (DBMS). The capabilities of the most high-end knowledge representation and delivery systems are extensive, but may not be pragmatic or accessible to a large community of potential users. We present SOPHIA, a frame-based knowledge architecture which is built upon a relational DBMS (RDBMS) to provide...