a chemical or biological analysis multi - point micro - system including a structure equipped with micro - wells , each micro - well being intended to receive a reagent coupled with a conductive polymer . each micro - well includes a reception electrode on which the reagent is fixed by the conductive polymer with which it is coupled . each micro - well also includes a counter - electrode arranged so as to be able to apply , in a volume of the micro - well , an electric field between its counter - electrode and its reception electrode . the structure further enables the simultaneous connection of all the reception electrodes to a first electric potential and enables the simultaneous connection of all the counter - electrodes to a second electric potential to be able to set up the electric field .