Mathematical Biosciences Mathematical Biosciences is abstracted or indexed in Applied Mechanics Review, Biological Abstracts, CABS/ Current Awareness in Biological Sciences, Chemical Abstracts, Current Contents, Engineering Index, Excerpta Medica, INSPEC, International Abstracts of Biological Sciences, Mathematical Reviews, and Medicus/ MEDLINE. Volumes 177&178 May/June, 2002 Deterministic and Stochastic Modeling of Biointeraction Foreword E. Eller, Population extinction and recolonization in human demographic history E. Pollak, Eigenvalue effective population numbers for populations that vary cyclically in size J.-M. Naulin, A contribution of sparse matrices tools to matrix population model analysis O. Angulo and J.C. Lopez-Marcos, Numerical integration of autonomous and non- autonomous non-linear size-structured population models J. Dyson, R. Villella-Bressan and G.F. Webb, Asynchronous exponential growth in an age structured population of proliferating and quiescent cells G. Chiorino and M. Lupi, Variability in the timing of G,/S transition A. Bertuzzi, A. Fasano, A. Gandolfi and D. Marangi, Cell kinetics in tumour cords studied by a model with variable cell cycle length 103 J. Arino and J.-L. Gouzé, A size-structured, non-conservative ODE model of the chemostat 127 T.G. Muller, N. Noykova, M. Gyllenberg and J. Timmer, Parameter identification in dynamical models of anaerobic waste water treatment 147 M. Gyllenberg and T. Koski, Bayesian predictiveness, exchangeability and sufficientness in bacterial taxonomy 161 P. Auger, R. Bravo de la Parra, S. Morand and E. Sanchez, A predator-prey model with predators using hawk and dove tactics 185 B.W. Kooi, L.D.J. Kuijper, M.P. Boer and S.A.L.M. Kooijman, Numerical bifurcation analysis of a tri-trophic food web with omnivory 201 C.A. Braumann, Variable effort harvesting models in random environments: generalization to density-dependent noise intensities 229 (Continued on last page of the issue) 0025-5564(200205)177-178;1-5 Mathematical Biosciences (Contents, continued from the outside back cover) J.C. Kesinger and L.J.S. Allen, Genetic models for plant pathosystems Z. Feng, C.-C. Li and F.A. Milner, Schistosomiasis models with density dependence and age of infection in snail dynamics R.J. Gallop, C.J. Mode and C.K. Sleeman, Determination of threshold conditions for a non- linear stochastic partnership model for heterosexually transmitted diseases with stages C.M. Kribs-Zaleta and M. Martcheva, Vaccination strategies and backward bifurcation in an age-since-infection structured model F.G. Ball and O.D. Lyne, Optimal vaccination policies for stochastic epidemics among a population of households A. Pugliese, On the evolutionary coexistence of parasite strains Author index Subject index CO NTENTS This journal is part of ContentsDirect, the free alerting service which sends tables of contents by e-mail for Elsevier Science books and journals. You can register for * ContentsDirect online at: www.elsevier.com/locate/contentsdirect NOW included in your subscription Free access to the Electronic Edition MBS ONLINE www.elsevier.com/locate/mbs