Reaction-diffusion systems and nonlinear waves

The authors investigate the solution of a nonlinear reaction-diffusion equation connected with nonlinear waves. The equation discussed is more general than the one discussed recently by Manne, Hurd, and Kenkre (2000). The results are presented in a compact and elegant form in terms of Mittag-Leffler functions and generalized Mittag-Leffler functions, which are suitable for numerical computation. The importance of the derived results lies in the fact that numerous results on fractional reaction, fractional diffusion, anomalous diffusion problems, and fractional telegraph equations scattered in the literature can be derived, as special cases, of the results investigated in this article.Comment: LaTeX, 16 pages, corrected typo

Three years on demography of a group of Alouatta guariba clamitans Cabrera (Primates, Atelidae): growth and fragmentation

This study was carried out in the Chácara Payquerê do Bugre, State of Paraná, Southern Brazil (25º29'52" S and 49º39'24" W) and reports on the demography of a group of Alouatta guariba clamitans Cabrera, 1940 followed monthly during three years (from February, 2002 to March, 2005). The growth and subsequent fission of the group are described and argued, as well as their possible underlying causes, focusing on the population ecology and social behavior of this taxa.<br>Este estudo foi realizado na Chácara Payquerê do Bugre, Estado do Paraná, Sul do Brasil (25º29'52" S e 49º39'24" W), registrando aspectos da demografia de um grupo de Alouatta guariba clamitans Cabrera, 1940 acompanhado mensalmente durante três anos (de fevereiro de 2002 a março de 2005). O crescimento e a subseqüente fissão do grupo são descritos e discutidos, bem como suas possíveis causas, enfocando a ecologia populacional e o comportamento social deste taxa