Tipuri de bacterii, exemple -http://www.youtube.com/watch?v=J6akNYlkehY&feature=related Caria dentara - http://www.youtube.com/watch?v=-nBSQQHYdkE
Diviziunea directa la bacterii http://www.youtube.com/watch?v=gEwzDydciWc
Probiotice - http://www.youtube.com/watch?v=N6rRjQLAZqQ
Probiotice – efecte - http://www.youtube.com/watch?v=ht0erio_pNA
Probiotice iaurturi - http://www.youtube.com/watch?v=2k8Puxz54FQ
Probiotice – la doctor - http://www.youtube.com/watch?v=eZ0KnM5pyU0