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United States Department of Agriculture

Agricultural Research Service

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Image Number D1293-1

Microbiologist Jean McLain (left) examines bacterial colonies in petri dishes as technician Sharette Evans prepares more soil and water samples for analysis. Dark-blue colonies, presumptive for E. coli, will be isolated and tested for false positives.


Photo by Stephen Ausmus.

640 pixels wide: (d1293-1.jpg)

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Last Modified: 8/13/2016
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