Depolarizationof the axon hillock to threshold results in the generationand propagation of an action potential. The action poten-tial is a transient change in the membrane potential charac-terized by a gradual depolarization to threshold, a rapid ris-ing phase, an overshoot, and a repolarization phase.
Ecology. Staphylococcus aureus is a normal inhabitant of the skin and mucous membranes in the nose of a healthy human, while S. epidermidis inhabits only the skin of healthy humans. S. aureus is infectious to both animals and humans.he Staphylococcus aureus genome, which is the most common species amoung the genome projects, is about 2.8 Mega-base pairs long with approximately 2,600 open reading frames, comprising 84.5% of the genome.
Ecology. Staphylococcus aureus is among the most common hospital acquired pathogens. It is a normal inhabitant of the skin and mucous membranes in the nose of a healthy human. S. aureus is infectious to both animals and humans and may only survive on dry skin.RSA: The first serious emergence of antibiotic resistance staph occurred with a specific strain we refer to as Methicillin-Resistant Staphylococcus aureus, abbreviated as MRSA. This strain expressed a modified penicillin-binding protein encoded by mecA gene and is present in 4 forms of Staph.