Heavy-metals are known to be toxic for the living organisms. Except in few places where they are especially abundant, heavy-metals are only present in low amounts in the environment. Therefore, living organisms have to fight against when the heavy-metal concentration is ioncreasing in their surrounding. Some organisms are able to adapt to increasing metal concentration whereas other are dying. Among the living ornanisms, microalgae consititues a material of choice for such a purpose and algae ranging in both types of organimsm are used in environmental and ecological studies: the first type of organisms can be used for decontamination whereas the second type can be used for detecting and monitoring pollution. The aim of this project is to identify primary target destruction ba heavy metals in green alga. (en)