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.
The natural environment of S. epidermidis is the human body and usually originates from disease. Since the bacteria usually lives on the skin and nares of all human beings and is a nosocomial pathogen, it is imporant to be able to identify the specific strains.S. epidermidis is the most common staphylococcus on the human skin.In addition, S. epidermidis also covers 90%-100% staphylococci from the nares when S. aureus is not present. When S. aureus is present the S. epidermidis amount decreases drastically (4).he natural environment of S. epidermidis is the human body and usually originates from disease. Since the bacteria usually lives on the skin and nares of all human beings and is a nosocomial pathogen, it is imporant to be able to identify the specific strains.