What is the significance of S. marcescens,M.luteus, S.epidermidis, and E. Coli?
Which of these are gram-positive and gram-negative, and where can these be
found? Also, what problems can they cause? When we culture these
bacteria, we used four methods: plates, broth, slants, and pour plates.
The media was made of TSB, TSA, NAP, and NAD. What
is significant about these culturing methods?
I could give you the answer to that question but it is
more informative, and fun, to find out yourself. Start
with the NCBI library online
(http://www.ncbi.nlm.nih.gov/) and do a query with the
species name, and 'virulence' if you want to know what
they're doing to us. Have a look at the taxonomy
devision to see how they are related. To find out if
they're gram-pos or neg you should do a gram stain if
you can. Otherwise you'll find that information in any
bacteriology determination guide. Your question about
the media is not specific enough so I can't answer it.
Bacteria are a fascinating field of microbiology. Take
some time to find out and you'll enjoy it. Have a look
at www.bacteriamuseum.org to get the feeling.
These questions sound like questions at the end of a lab exercise. In other
words, they are questions your instructor wants you to find on your own. The
organisms you are using are generally non-pathogenic, except E. coli which
can be pathogenic in certain strains. You can find out which are
gram-positive or gram negative in any microbiology text book. Or you can go
www.asm.org or www.microbe.org
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Update: June 2012