biological invasions form a major threat to the provision of ecosystems productsand services and can affect ecosystems across a wide spectrum of bioclimatic conditions.therefore, it is important to systematically monitor the spread of species over broad regions. ithas long been recognized that remote sensing and geographical information system couldcontribute to this capacity. this paper aims t...

In a spatially heterogeneous environment the propagation speed of biological invasion varies in space. The traveling wave theory homogeneous case is not extended to case. Taking singular limit hyperbolic scale good way study such with constant speed. goal this project understand effect diffusion on spatial environment. For purpose, we consider \begin{document}$ U_t = {\varepsilon}(\gamma(s)U)_{...

Introduction:Oral Squamous Cell Carcinoma (OSCC) is an invasive neoplasm with a high prevalence. Matrix Metalloproteinase (MMP) has been thought to play an important role in both the invasion and metastasis of tumors. The aim of this study was to explore the significance of MMPs expression in clinical outcome of these patients. Materials:The most recognized data Bases such as PubMed, Google sc...

International economic activities have helped species spread into non-native habitats, which cause significant ecological and economic burden of invaded countries. Therefore, an intuitive method to prevent exotic species from invasion is to use tariff or non-tariff trade barriers to limit trade. Nevertheless, restriction on trade has its own costs; and besides, trade barriers may not be availab...

William F. Fagan Mark A. Lewis Michael G. Neubert and P. van den Driessche Department of Biology, Arizona State University, Tempe, AZ 85287±1501, USA. Tel. 480-965-8263. Fax +480-965-2519. E-mail [email protected] Department of Mathematics, University of Utah, Salt Lake City, UT 84112, USA. Current Address: Department Mathematical Sciences and Department Biological Sciences, University of Alberta,...