Mathematicians have made various attempts to understand the dynamical behaviour of HIV and AIDS using within-and between-host transmission models. Since the mechanismof HIV and AIDS transmission is an intricate process, ...

Sustainable exploitation of renewable resources such as marine sh has been a con- cern to both ecologists and economists with threats of species extinction due to over - exploitation a stark reality. Fish exhibits ...

ABSTRACT Rangeland vegetation are important resources for livestock, wildlife and human beings and are largely influenced by climatic conditions. The effects of climate change are varied and among them is uncertainty in ...