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United States Department of Agriculture

Agricultural Research Service

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Image Number D1294-1

Technicians Allan Knopf and Sharette Evans collect water samples from a pond that supplies irrigation water to Pacana Park in Maricopa, Arizona. In the laboratory, the pond-water samples are filtered to isolate microbes. DNA extracted from the filters is then screened for the presence of human-specific Bacteroides molecular markers.


Photo by Stephen Ausmus.

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Last Modified: 8/13/2016
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