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2017-09-14 19:55:43

E. coli commonly grows with uniform fine turbidity as seen in the 25 μg/mL Earth control (upper image). Spaceflight samples challenged with the concentrations of gentamicin at 125 μg/mL or higher tended to aggregate. The lower image shows the spaceflight sample treated with 175 μg/mL—after its return to Earth—and the clustered cells (red box) in an otherwise visibly clear growth medium.

Image uploaded by Karen Graham
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