my unknown - Biology Forum

last updated by

gakerty 15 years, 9 months ago

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- April 30, 2009 at 6:57 pm #11306
  x3chibi
  Participant
  We have no idea what it is because we thought it could be S. aureus or eidermis but we know it’s not.
  gram positive cocci
  catalase positive
  alpha hemolysis
  facultative anaerobe
  mannitol fermenter
  whitish
  Nothing seemed to match all of these.
- May 2, 2009 at 5:47 pm #90526
  Cat
  Participant
  How do you "know" that is is not S. aureus?
  Your findings strongly suggest S. aureus (some stains do have whitish color).
- May 13, 2009 at 5:22 pm #90782
  gakerty
  Participant
  Do you have the means to test for coagulase in your lab? S. aureus will be coagulase (+), S. epidermidis and others will be coagulase (-). You may have access to TGA (Tellurite-Glycine Agar) plates, which differentiate coagulase + (black pigmented colonies) and coagulase – (grayish, or white)although it’s certainly not perfect. By "whitish" in pigment, I’m assuming you have already tested on TGA, or do you mean regular nutrient agar? The latter usually doesn’t tell you much.
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