Biogenic synthesis of silver nanoparticles using Azadirachta indica methanolic bark extract and their anti-proliferative activities against DU-145 human prostate cancer cells

1 Department of Molecular Biology and Biotechnology, Pan-African University, Institute of Basic Sciences, Technology and Innovation, P. O. Box 62000-00200, Nairobi, Kenya. 2 Department of Physical Sciences, Mount Kenya University, General Kago Rd P. O. Box 342-01000 Thika, Kiambu, Kenya. 3 Department of Veterinary. Anatomy and Physiology, P.O Box 3709-00100, University of Nairobi, Kenya. 4 Centre for Traditional Medicine and Drug Research, Kenya Medical Research Institute, P. O. Box 54840 00200, Off Mbagathi Road, Nairobi Kenya. 5 Department of Biochemistry, Jomo Kenyatta University of Agriculture and Technology, P. O. Box 62000-00200, Nairobi, Kenya. 6 Department of Veterinary Physiology, Biochemistry and Pharmacology, Sokoine University of Agriculture, P. O. Box 3017, Morogoro, Tanzania.