Mel, a surgical technology student, was assigned to a procedure scheduled as an incision and drainage of multiple traumatic wounds. The patient was transported to the OR from the ICU since being admitted following a hiking fall resulting in multiple deep lacerations to the torso and extremities, including a penetrating injury of the upper abdomen and an open femoral fracture. Prior to the I\&D procedure, the surgeon took cultures from the two open wounds. Mel noticed that there were darkened areas in the wounds and a very slight fruity odor.

Which type of Gram-negative microorganism has the characteristic signs of darkening and fruity odor?