"For the first time, these scientists were able to demonstrate that the coevolutionary process is dependent on ecological conditions. Indeed, under certain conditions, the prey becomes resistant to the predator, which itself evolves so that it can attack this new prey. In addition, the scientists issued a warning against the previously envisaged use of this predator (Bdellovibrio bacteriovorus) as a "living antibiotic" because, like other antibiotics, this could lead to the selection of resistant pathogenic bacteria."
"Scientists in the Laboratoire Écologie et Évolution have used this type of experiment to understand how the environment influences the evolution of a pair of bacteria. One was the predator, Bdellovibrio bacteriovorus, and the other the prey, Pseudomonas fluorescens. The predator penetrated the prey and killed it by consuming it from the inside. This predator is a relatively common bacterium, one which British researchers have suggested could be used as a 'living antibiotic'."In other words, not only has evolution been observed in a lab (again), but the predator/prey relationship is now even more fully understood, and that evolution is beneficial to humans.
Don't cry, Ray.