Abstract and Figures Amazonian lowland tropical rainforests cover ~5.79 million km2. Based on geology, the Amazon lowland forest area can be divided into six regions. The Guiana Shield and Brazilian Shield (in the southern Ama- zon) are on very old, nutrient-poor soils, while the Western Amazonian regions (northern and southern) and the regions along the …
Amazonian ecosystems and their ecological functions Leer más »
Resumen Anthropogenic pressure in the high altitude lakes such as Titicaca and Uru (Bolivia) may favor the production of methylmercury (MeHg) known to accumulate in trophic chains. Periphyton associated with emerged aquatic plants (totoras) from the lake shores accumulates and demethylates MeHg providing a potential cost-effective water treatment technique.
Abstract and Figures Enterohemorrhagic Escherichia coli (EHEC) infection leads to marked intestinal injury. Sigmoid colon obtained from two children during EHEC infection exhibited abundant TUNEL-positive cells. To define which bacterial virulence factors contribute to intestinal injury the presence of Shiga toxin-2 (Stx2), intimin and the type III secretion system were correlated with symptoms and intestinal …
Intestinal damage in enterohemorrhagic Escherichia coli infection Leer más »