Malaysian Applied Biology Journal

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Malays. Appl. Biol.(2007) 36(1): 7–13



1 Department of Biology, University center Larbi Tebessi, Tebessa, 12000, Algeria.
2 Laboratory of Cell toxicology, Department of Biology, Faculty of the Sciences, Annaba university, 23000, Annaba, Algeria.
*E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it


The effect of two pesticides, the Diflubenzuron (DFB) and the Flucycloxuron (FCX) has been studied on a cellular model: Tetraselmis suecica, a flagellated protiste. The two pesticides have been tested in vivo on the culture of Protiste in strictly controlled conditions (Temperature, Light/Obscurity). The treatment with the DFB in the concentrations of 10 and 20 ?g/ml reduces the growth of this Protiste appreciably. The survey of the respiratory metabolism by the polarography technique (Oxygen electrode) shows a sensitive perturbation of the oxygen consumption by the studied protiste. In the case of the FCX, the treatment with the two concentrations (10 and 20 ?g/ml) reveals an inhibition of the protiste growth; however, this pesticide inhibits the respiratory metabolism of ciliated protiste. This effect is a lot more marked with the FCX that with the DFB.

Key words: Tetraselmis suecica, Flagellated protiste, Flucycloxuron, Diflubenzuron, Pesticides


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