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.
3. Staphylococcus aureus Culture. When staph is expected, a part of a medical specimen is spread over the trypticase soy agar (TSA) with 5% sheep blood (BAP = blood agar plate), (2). On such agar, S.aureus forms golden yellow colonies (cream white to orange), (3), while S.epidermidis forms white colonies (Picture 2).xamples of the kits, based on agglutination, for detection of MRSA in clinical samples (after culturing) are: Dry Spot Staphytect PlusÂ®test, Pastorex Staph PlusÂ®test, the Slidex Staph-KitÂ®,Slidex Staph PlusÂ®test, the StaphaurexPlusÂ®test and the Staphylase TestÂ® .