FIG. 2.

Array hybridization images showing the detection sensitivity with labeled pure genomic DNA and bulk community DNA from soil. (A) Genomic DNA from a pure culture of nirS-containing P. stutzeri E4-2 was labeled with Cy5 using the random primer labeling method. The target DNA was hybridized to the microarrays at total concentrations of 0.5, 1, and 5 ng. (B) Genomic DNA from surface soil O22 (10, 25, and 50 ng) was labeled with Cy5 as described for panel A and hybridized with the microarrays.