Hind A. Al-Zahrani, Amr A. El-Waseif and Dina E. El-Ghwas 2018. Biosynthesis and evaluation of TiO2 and ZnO nanoparticles from in vitro stimulation of Lactobacillus johnsonii. Journal of Innovations in Pharmaceutical and Biological Sciences. 5, 1 (Jan. 2018), 16–20.