Source: https://listes.u-picardie.fr/wws/d_read/unidiversite/ENSEIGNEMENTS/Microbiologie%20G%C3%A9n%C3%A9rale%20L3S5/Travaux%20dirig%C3%A9s/TD%20Microbiologie%20G%C3%A9n%C3%A9rale.pdf