Identifying Bacteria - Biology Forum

last updated by

marilynkatie 13 years ago

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- November 29, 2011 at 1:01 am #15763
  sasha25
  Participant
  Hello, I am taking Microbiology 205. We have to figure out the unknowns.. I have 2.. But I am having lots of trouble figuring out what this is.. Please help me..
  Gram +
  Cell Shape rods and chains
  No motility
  favorite temp 37
  no color on the Agar
  it is aerobic
  positive for glucose,and mannitol, MR test, and Catalyst
  Neg for vp
  It is also weak in for starch.
  I crossed out many of the choices due to the shape.. Here are the rest of the choices.
  Bacillus cereus, Bacillius megaterum, bacillus subtilis, clostridium bejerincki,clostridium sporogenes, mycobacterium phlei (I think this is it), mycobacterium smegmatis.
  Please help me. Thank you very much.
- December 4, 2011 at 5:11 pm #108566
  marilynkatie
  Participant
  Hi, I am tryin to identifying my unknown. I know it is bacillus.
  Gram stain- +
  motility- +
  spore stain- +
  acid-fast – negative
  capsule – +
  optimal temp. 37
  facultative anaerobe
  all positive for in acid-gluocose,lactose, sucrose, mannitol
  nethyl red- +
  VP- negative
  castalase test- positive
  oxidase, hydrogen sulfide, citrate, phenylalanine, indole, urea, are all negative
  starch hydrolysis, and gelatine are positive.
  I have narrowed it down but I still can’t find it.
  Please help me and Thank you very much.
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