Generally, if the entire tube is turbid, this indicates that the bacteria have moved away from the stab mark (are motile). The organisms in the two tubes pictured on the right are motile. If, however, ...

By then it was known that Listeria infects cells such as macrophages—motile human immune cells that engulf pathogens and cellular debris—by being taken up into vacuoles and breaking out of those ...

This change allowed the non-motile bacteria to "hitchhike" on other bacteria, increasing their chances of survival in ...