Vertical flow-constructed wetlands for domestic wastewater treatment under tropical conditions: effect of different design and operational parameters.

This study assessed the treatment of domestic wastewater to find the optimum vertical flow-constructed wetland (VFCW) configuration under tropical conditions. Eight pilot-scale configurations units were studied to compare between fine sand and medium gravel used as substrate, two feeding frequencies (20 pulses d and 10 pulses d), and the presence or absence of tropical plants (Heliconia psittacorum). The results showed that the sand beds were significantly more efficient in the removal of organic matter, ammonia nitrogen, and total suspended solids than gravel beds, presenting average removal rates of 48 and 24 g m d of COD; 35 and 16 g m d of BOD; 7 and 4 g m d of [Formula: see text]; 9 and 0 g m d for sand and gravel, respectively.

Computational approaches for evaluating the effect of sequence variations and the intrinsically disordered C-terminal region of the Helicobacter pylori CagA protein on the interaction with tyrosine kinase Src.

The Helicobacter pylori CagA protein was the first bacterial oncoprotein to be identified as important in the development of human malignancies such as gastric cancer. It is not clear how it is able to deregulate a set of cell control mechanisms to induce carcinogenesis following translocation into human gastric epithelial cells. It is likely, however, that structural variations in the CagA sequence alter its affinity with the host proteins inducing differences in the pathogenicity of different H.