3 documents found, page 1 of 1
Removal of Zn and Cd from Overlying Water by Mangrove Sediments: Testing the Ef...
Suzuki, K. N.; Castro, R. J. M.; Sondermann, Melissa N.; Machado, E. C.; Bellido, A. B.; Lopes, R. T.; Machado, W.Coastal sediment redeposition after resuspension events may change the sediment capacity to sequester pollutants after the formation of new sediment-water interfaces. To test this hypothesis, radiotracer experiments were performed to evaluate zinc (65Zn) and cadmium (109Cd) removal kinetics by redeposited mangrove sediments. After 24-h experiments, average inventories within redeposited sediments were close to ...
Leaf nitrogen supply improves sugarcane photosynthesis under low temperature
Cerqueira, G.; Santos, M. C.; Marchiori, P. E. R.; Silveira, N. M.; Machado, E. C.; Ribeiro, R. V.This study aimed to test the hypothesis that increases in leaf nitrogen concentration would reduce the sensitivity of sugarcane photosynthesis to low temperature. IACSP95-5000 plants were grown inside a growth chamber at 30/20oC (day/night) and we evaluated the effects of leaf nitrogen spraying (2.5% urea) on plants facing low temperature (22/12°C) for eight days. The leaf nitrogen supply increased leaf nitroge...
Influence of biological activity on 65Zn and 109Cd removal from tidal water by ...
Sondermann, Melissa N.; Suzuki, K. N.; Machado, E. C.; Machado, W.; Bellido, L. F.; Lopes, R. T.; Bellido, A. V. B.The biological activity influence on the mangrove sediment capacity to remove 65Zn and 109Cd from tidal water was evaluated in a site chronically polluted. Benthic Activity Indexes (BAI), corresponding to relative estimates of biological impact on radiotracer accumulation, were higher for 109Cd (~ 38%) than for 65Zn (~ 10%) in the top centimetre of sediment. However, BAI exceeded 96% for deeper sediment layers....