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E. coli. test packets (6077355384)

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Description: To test for E. coli. in Sonoran Desert Network streams, water samples are inoculated with a growth medium that produces a color (a stunning magenta in this case) and also fluoresces under a black light. By comparing the number of positive large to positive small cells, the concentration of E. coli can be estimated. Date: 23 August 2011, 08:34. Source: E. coli. test packets. Author: SonoranDesertNPS from Tucson, Arizona.

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