H
hillthekhore
Guest
To give a slightly more scientific reply, one of the reasons your cultures MIGHT become more susceptible to a specific antibiotic is that making more proteins takes resources. That is to say that in order for a bacteria to be resistant to an antibiotic, it often has to make a new protein, and that takes energy. Bacteria that don't have the DNA to make that protein use fewer resources and have a better chance of surviving provided the antibiotic the protein fights isn't present. Thus, bacteria can essentially reverse mutate and become less complex to make it easier to grow.