| Autor: |
Itala Gabriela Sobral dos Santos, Alfredo Olivera Galvez, Juliana Moura de Lun, Raquel Diniz Rufino, Leonie Asfora Sarubbo, William Severi, Alex Souza Moraes |
| Jazyk: |
English<br />Portuguese |
| Rok vydání: |
2016 |
| Předmět: |
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| Zdroj: |
Revista Geama, Vol 2, Iss 4, Pp 502-510 (2016) |
| Druh dokumentu: |
article |
| ISSN: |
2447-0740 |
| Popis: |
Biosurfactants can be used in environmental pollution control systems for oil spill and its derivatives, since they increase the bioavailability of contaminants by reducing the surface tension of water. The mollusk Anomalocardia brasiliana is a species that inhabits areas with little suspended material. The aim was to test the tolerance concentration and the median lethal concentration (LC50) for a period of 96h through survival. The experiment was conducted at UFRPE, and the biosurfactant produced the root Candida lipolytica, having an industrial waste as a source of carbon, plus mineral medium. The animals were not fed for 24 hr prior to the experiment. It was performed six treatments (1:10, 1:20, 1:40, 1:80 and 1: 160) in three replicates, with the density of 2.5 individual / Litre and subjected to constant aeration at a temperature of 26 ± 0 5 ° C and salinity 26. It follows that the treatments 1 (1:10) and 2 (1:20) gave a survival 76.18%, however treatments 3 (95.23%) and 4 (95 83%) were higher and treating with 5 to 100%. The LC50 estimated for the biosurfactant tested was 0.222 or 1: 4.5. The compound is lethal to the test organism used in dilutions being suggested further experiments with dilutions from 1: 05 to 1:20, to better estimate of LC50 for the same species. Thus, a better understanding of the lethal concentration in organisms representing different trophic levels brings positive results to optimize the procedures in environmental monitoring in port areas. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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