A USGS microbiologist pours a groundwater sample into a sterile filter
Detailed Description
Michigan Bacteriological Research Laboratory — Lansing, Michigan. A USGS microbiologist pours a groundwater sample into a sterile filter cup. This water sample will be pulled through a 0.2 micron filter, and will ultimately be used to characterize what bacteria are present within the groundwater sample.
Sources/Usage
Public Domain.