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11.
Edison Barbieri 《Water environment research》2007,79(7):707-719
Active metabolism and swimming activity were used to study the effects of dodecyl benzene sodium sulfonate (LAS-C12) in Mugil platanus, a species traditionally considered as estuarine. The effects of exposure to different concentrations of LAS-C12 (0.0, 1.0, 2.5, and 5.0 mg/L) on the active metabolism and swimming activity of Mugil platanus were evaluated. The active metabolism and swimming activity were estimated through experiments conducted on each of 9 possible combinations of three temperatures (35, 20, and 15 degrees C) and three salinities (35, 20, and 5 per thousand). The results show that the active metabolism increases according to the LAS-C12 concentration in all temperatures and salinities studied. At the highest tested concentration (5.0 mg/L), the active metabolism was 111%; 84.8 and 105% higher than the control, at 35 per thousand salinity at the three temperatures. However, the swimming activity decreased according to the LAS-C12 concentration in all temperatures and salinities studied. At the highest tested concentration, the swimming activity was 78.6, 73.6, and 78.7% less than the control, at 25 degrees C at the three salinities. The active metabolism and swimming activity averages, achieved in the different salinities studied, were not significantly different, as a result of the LAS-C12 concentration. 相似文献
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This paper describes an experimental evaluation of anaerobic digestion technology as an option for the management of organic solid waste in developing countries. As raw material, a real and heterogeneous organic waste from urban solid wastes was used. In the first experimental phase, seed selection was achieved through an evaluation of three different anaerobic sludges coming from wastewater treatment plants. The methanization potential of these sludges was assessed in three different batch digesters of 500 mL, at two temperature levels. The results showed that by increasing the temperature to 15 degrees C above room temperature, the methane production increases to three times. So, the best results were obtained in the digester fed with a mixed sludge, working at mesophilic conditions (38-40 degrees C). Then, this selected seed was used at the next experimental phase, testing at different digestion times (DT) of 25, 20 and 18 days in a bigger batch digester of 20 L with a reaction volume of 13 L. The conversion rates were registered at the lowest DT (18 days), reaching 44.9 L/kg(-1) of wet wasteday(-1). Moreover, DT also has a strong influence over COD removal, because there is a direct relationship between solids removal inside the reactor and DT. 相似文献
13.
de Oliveira Edison Rogério Marques da Silva Bruno Guzzo Vieira Roniérik Pioli 《Journal of Polymers and the Environment》2021,29(6):1-11
Journal of Polymers and the Environment - Limonene represents a possible candidate for the synthesis of polymers from renewable sources. However, because of some structural characteristics, the... 相似文献
14.
Balamurali G. S. Edison Alitha Somanathan Hema Kodandaramaiah Ullasa 《Behavioral ecology and sociobiology》2019,73(3):1-10
Behavioral Ecology and Sociobiology - In sand fiddler crabs, Uca pugilator, contests between residents and intruders for breeding burrows often escalate to forceful pinching. In these contests, we... 相似文献
15.
The main purpose of the present study was to detect the acute toxicity of cadmium (Cd) in F. paulensis and to investigate its effect on oxygen consumption and ammonium excretion different salinities. First, we examined the acute toxicity of Cd in F. paulensis at 24, 48, 72, and 96-h lethal concentration (LC50). Cd was significantly more toxic at 5 salinity than at 20 and 36. The oxygen consumption and ammonium excretion were estimated through experiments performed on each of the twelve possible combinations of three salinities (36, 20 and 5), at temperature 20 °C. Cd showed a reduction in oxygen consumption at 5 salinity, the results show that the oxygen consumption decreases with respect to the Cd concentration. At the highest Cd concentration employed (2 mg L−1), the salinity 5 and the temperature at 20 °C, oxygen consumption decreases 53.7% in relation to the control. In addition, after separate exposure to Cd, elevation in ammonium excretion was obtained, wish were 72%, 65% and 95% higher than the control, respectively. The results show that Cd is more toxic to F. paulensis at lower salinities. 相似文献
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Machado W Rodrigues AP Bidone ED Sella SM Santelli RE 《Environmental science and pollution research international》2011,18(6):1033-1036