“…Units of peroxidase activity were expressed as the amount of enzyme required to change the optical density by 1 unit per min. The specific activity expressed in terms of units per g of proteins was deduced by the law of Beer-Lambert [ 57 , 58 ] as follows: C = DO/ ε .l.p, where C = concentration of ovarian total peroxidases (mM/g of total proteins); DO = optical density; ε = molar extinction coefficient (11.3 M− 1 cm− 1); l = path length (1 cm); p = ovarian total protein level (g).…”