**Preface XI**



X Contents

Chapter 8 **Histopathological Alterations in some Body Organs of Adult** *Clarias gariepinus* **(Burchell, 1822) Exposed to 4-Nonylphenol 163**  Alaa El-Din H. Sayed, Imam A. Mekkawy and Usama M. Mahmoud

Chapter 9 **Apoptosis and Ovarian Follicular Atresia in Mammals 185**  J.K. Bhardwaj and R.K. Sharma
