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Percentage distribution of bacterial genera isolated from the Amazon forest soil using three different isolation strategies: direct plating (A), enrichment in semisolid N-free medium before plating (B), and enrichment followed by subculturing in semisolid N-free medium before plating (C). Isolates were identified on the basis of sequencing of the 16S rRNA gene. The total number of isolates (n) obtained with each method is provided.
