... present. The result obtained with dithioniteconfirms this conclusion; indeed, even through the reductionis total, the oxidation is only partial, with the fraction ofoxidation corresponding to ... of one electron to the hemes, thento the [Fe-S] cluster, to be finally accumulated at the level of the molybdenum cofactor to be able to undertake the catalytic reaction. The location of the ... the nitrate according to the concentration in nitratereductase with the three electron donors used (dithionite,menadiol and duroquinol).In the concentration range used, the amplitude ofabsorbance...