It's a microbial world
Thioglycollate tubes for measuring oxygen requirements (as inoculated by my micro students, above).  Thioglycollate creates a reduced environment in this semi-soft agar, with a small amount of oxygen diffusing in from the top (as shown by the pink of the redox indicator).  Organisms with different oxygen requirements will grow in different parts of the tube.  On the left is a facultative anaerobe that can grow in both aerobic and anaerobic conditions, as seen by its growth throughout the entire tube; in the middle is an obligate anaerobe that can only grow in the area where oxygen is absent; and on the right is an obligate aerobe - it requires oxygen to survive so it can only grow in the top of the tube.  

Thioglycollate tubes for measuring oxygen requirements (as inoculated by my micro students, above).  Thioglycollate creates a reduced environment in this semi-soft agar, with a small amount of oxygen diffusing in from the top (as shown by the pink of the redox indicator).  Organisms with different oxygen requirements will grow in different parts of the tube.  On the left is a facultative anaerobe that can grow in both aerobic and anaerobic conditions, as seen by its growth throughout the entire tube; in the middle is an obligate anaerobe that can only grow in the area where oxygen is absent; and on the right is an obligate aerobe - it requires oxygen to survive so it can only grow in the top of the tube.  

  1. zephinzer reblogged this from thescienceofreality and added:
    Reminds me of ecology where Nature separates organisms by dividing their niches accordingly, like how a tree can be host...
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    I miss micro lab.
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    Microbiology :)
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    Is it odd that I find microbiology relaxing?
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