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Figure 2 | BMC Microbiology

Figure 2

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

Figure 2

Color change resulting from the microbial reduction in soil of the respiratory dye XTT Bottle on the far left is a control of the oxidized dye in sterile water. The middle bottle shows lack of dye reduction by a sandy soil that was autoclaved. The bottle on the far right shows dye reduction (increase in orange color measurable at 465 nm) from a biologically active (contains living bacteria) sandy soil.

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