Volatile com ponents of Cryptoporus volvatus attracting three pine beetles (Ischnodactylus loripes, A lphitophagus plagiatus, Bolitophagus felix, family T enebrionidae) were isolated and found to be a m ixture of two m onoterpenes and an aliphatic hydrocarbon by means of GC-MS. The attractivity of the fungus for the beetles can be induced by synergistic action of (+)-isopinocam phone, (+)-/nm s...

A delayed periodic n-species simple food-chain system with Holling type-II functional response is investigated. By means of Gaines and Mawhin’s continuation theorem of coincidence degree theory and by constructing appropriate Lyapunov functionals, sufficient conditions are obtained for the existence and global attractivity of positive periodic solutions of the system.

In this article we define the concept of weighted pseudo almost automorphic sequence, and establish some basic properties of these sequences. Further, as an application, we show the existence, uniqueness and global attractivity of weighted pseudo almost automorphic sequence solutions of a neural network model.

Scientific meetings have become increasingly important channels for scholarly communication. In this study we explore the use of an important feature of the ISI Proceedings database, namely, of information about conference location for the analysis of information flow such as relative attractivity, mobility and unidirectional or mutual affinity of countries.

where k∈N and {βn} is a sequence of positive real numbers. When k= 0 and βn ≡ β for alln∈N, (1.1) was introduced by May [2, pages 513–560] as an example of a map generated by a simple model for frequency-dependent natural selection. The local stability of the equilibrium ȳ = 1/2 of (1.1) was investigated by May [2]. In [1] (see also [3]), Grove further investigated the stability of the equilibr...

This paper deals with fuzzy cellular neural networks (FCNNs) with leakage delays and proportional delays. Applying the differential inequality strategy, fixed point theorem and almost periodic function principle, some sufficient criteria which ensure the existence and global attractivity of a unique almost periodic solution for fuzzy cellular neuralnetworks with leakage delays and p...