Prototype of a sensor for simultaneous monitoring of water level and temperature of rivers in the Amazon using FBG.

This work proposes an optical fiber sensor capable of simultaneously determining the variation in the level and temperature of the waters of rivers in the Amazon using two in Fibers Bragg Grating (FBG) coupled to a metallic bellows structure, which was experimentally demonstrated in terms of the characterization of FBGs, where one of them is a temperature compensator. The system was simulated according to the Coupled Modes Theory (CMT) and the Transfer Matrix Method (TMM) and experimentally the sensitivity of the sensors was analyzed from the wavelength displacement measurements, simultaneously varying the deformation and temperature. The experimental results show a sensitivity of 9.

Medicinal species with gastroprotective activity found in the Brazilian Cerrado.

Peptic and/or duodenal ulcers are characterized by diverse acute and chronic ulcerative lesions that commonly arise in any portion of the gastric mucosa that is exposed to the aggressive action of gastric acid. The pathophysiology of peptic ulcers has been attributed to an imbalance between aggressive and protective factors. In Brazil, medicinal plants are commonly used to treat this ailment.

Preliminary studies of gastroprotective effect of Celtis iguanaea (Jacq.) Sargent leaves (Ulmaceae).

Antiulcerogenic activity of crude ethanolic extract of Celtis iguanaea leaves (CEE) was observed with experimental models such as ethanol, indomethacin, stress and pyloric ligation-induced gastric ulcers. Results obtained from indomethacin-induced ulcer showed the hexane fraction (HF) as the active fraction of CEE. This fraction inhibits the gastric acid secretion, increasing the gastric pH, decreasing the gastric acidity and total gastric contents.