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16 results on '"Rosety, M.A."'

5. Time course variations of antioxidant enzyme activities and histopathology of gilthead seabream gills exposed to malathion

Author

Rosety, M.A., Rosety-Rodriguez, M., Ordóñez Muñoz, F.J., and Rosety, I.

Subjects
Gills, Glutathione Peroxidase, Insecticides, Time Factors, Superoxide Dismutase, Histopathology, Catalase, Antioxidants, Sea Bream, 6 - Ciencias aplicadas::61 - Medicina [CDU], Malathion, Water Pollution, Chemical, Animals, Antioxidant enzymes, Biomarkers
Abstract

In a widely distributed and commercially important fish, gilthead seabream Sparus aurata L., we have studied sublethal effects of malathion in order to identify early warning bioindicators of exposure before irreversible damage occurs. To achieve this goal, groups of 10 juvenile specimens were exposed for 24, 48, 72 and 96h to a sublethal concentration of malathion (0.4 mg/l). Another group was used as control. The activity of antioxidant enzymes (superoxide dismutase, catalase and glutathione peroxidase) and histopathological features from exposed gills were assessed. It should also be mentioned that no mortality was observed during the whole experience. The activity of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX) were altered significantly from 24 h onward (p

Published
2005

6. Acute toxicity of anionic surfactants sodium dodecyl sulphate (SDS) and linear alkylbenzene sulphonate (LAS) on the fertilizing

Author

Rosety, M.A., Ordóñez Muñoz, F.J., Rosety-Rodriguez, M., Rosety, J.M., Rosety, I., Carrasco, C., and Ribelles, A.

Subjects
6 - Ciencias aplicadas::61 - Medicina [CDU], urogenital system, Surfactant, Pollution
Abstract

In the present work we have evaluated and compared the acute toxicity of two anionic surfactants, Sodium Dodecyl Sulphate (SDS) and Linear Alkylbenzene Sulphonate (LAS) on the fertilizing capability of gilthead Sparus aurata L. sperm. The criterion used to judge exposure effectiveness was fertilization success. Spawned eggs and sperms were collected from adult giltheads. Sperms were dosed separately with different concentrations of SDS and LAS for 60 minutes. After this period, sperms and eggs were combined for 20 minutes during which fertilization took place. Finally, the number of fertilized eggs were counted and recorded to estimate the percentage of fertilization. Exposure to SDS and LAS concentrations of 0.3, 0.6, 1.5, 3 and 6 mg/L for 60 minutes caused a significant inhibitory effect on fertilization success in gilthead Sparus aurata L.. In addition, the EC50 value for gilthead fertilization after sperm exposure was found to be 2.8 mg/L and in the case of LAS it was of 2.6 The comparison of the results from SDS and LAS shows that the latter has a stronger negative effect on sperm viability than SDS.

Published
2001

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