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Figure 4 | BMC Microbiology

Figure 4

From: Measurement of microbial activity in soil by colorimetric observation of in situ dye reduction: an approach to detection of extraterrestrial life

Figure 4

Reduction of XTT dye by the heat-treated control soil and the life-positive Idaho red sand Data points represent: (), sterilized soil; and (■), live soil. Data points are means of three replicates, +/- standard deviation. Dye-only controls showed no reduction over the time course of the experiment. AU = Absorbance Units

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