Characteristics result Size 5-10 μm Form Rod Colony morphology Slightly irregular with undulated margin Gram staining Gram-positive Spore + Indole production - Methyl red + Voges– Proskeur - Utilization of citrate - Catalase + Hydrolysis of Gelatin + Hydrolysis of starch + Nitrate reduction + H2S production -

Table 1: Morphological, and biochemical characteristics of B. megaterium PB 4.