Isolation of bacteria was done by using serial dilution method. 0.1ml from each dilution bottle was streak on
Nutrient agar plates by spread method. The Petri dishes were incubated aerobically at 37 °C until colonies have
appeared. The isolates were re-cultured on new media for purification to get a single pure strain. Gram stain was
performed for each isolate. Biochemical tests were studied by using standard biochemical assays according to the
scheme Berge's manual and confirmed by Analytical Profile Index 20(API 20E) system technique. To obtain the
appropriate biomass of bacterial isolates, the isolates were inoculated separately in individual Erlenmeyer flask
contain nutrient broth medium and were incubated for 24h at 37°C in the rotary shaker incubator. The cells
harvested by using centrifugation at 4000 rpm for 10 min and the supernatant was discards. The cell concentration
of each strain measured using spectrophotometer at 600nm (OD600in order to obtain a 0.5mcf or 1.5x108 cfu/ml.