Evolutionistic evangelists have proposed creative stories about the actual observations.  Were these creative stories actually true, then the adaptation would be an example of random chance causing a helpful change.  Some of these creative stories actually wind a tale about adding information by random chance.  It must be remembered that these are only creative stories.  It must also be remembered that one example, if there were one, of random chance adding order, Information, organization, an increase in complexity or an improvement of function would only prove that evolution, though statistically improbable to the point of impossibility, may be theoretically possible.  It would not prove that it happened.  This is a major problem with Evolutionism, and is one of many reasons that Evolutionism is a religion based on an illogical hypothesis.

It is much more likely that the bacterium is designed to adapt under stress.  Plasmids of bacteria are designed to enable bacteria to adapt so they can use new sources for nutrition and deal with poisons. 

There are severe gaps between what has been observed and the creative stories that have been made up.  These stories are in conflict with the observed data in several areas.

The nylon eating bacteria story-telling is an example of the religion of Evolutionism grasping at straws.  It is an example of intelligent scientists who look at proof against Evolutionism, but all they can see is Evolutionism.  It is an example of mental filters.  This line of irrationality displays the ability of presuppositions and mental paradigms to make intelligent people blind to the facts.  It is a prime example of confirmation bias.