Fig. 1

Colonies appeared on the SCNA plates with or without supplementation of azithromycin by plating 100 µL of the river sediments of 1: 100 dilution. a, (b) and (c); actinomycete colonies appeared on the control SCNA plates, plates where 0.5 µg/mL of azithromycin was added and 2 µg/mL azithromycin was added, respectively.  The number of CFU/gram of soil of when the suspension of 1:100 dilution was plated on to the SCNA plates supplemented with different concentration of azithromycin