Cultivation medium
Each inoculum was developed in minimum medium. Fifty ml of medium was dispensed into 250 ml Erlenmeyer flasks, capped with cotton plugs and sterilized by autoclaving at 121°C for 15 min. The medium was inoculated with 1 loop from the minimum medium plate. The flasks were incubated in a Psychotherm shaker operating at 250 rpm, 37°C for 15 hours. The growth was measured by monitoring the culture OD600 at 1 cm. with various time intervals. The growth experiment was done in triplicate.