biochemical traits 1 cell morphology gram negative round ended rods with low mobility 1 5 2 0 u03bcm in length a meat peptone agar after 24 hours of growth at 37 u00b0 c cultures form rounded whitish semi transparent colonies with a diameter of 1 5 3 0 mm the surfaces of the colonies are smooth the edges are even or slightly wavy the center of the colony is elevated the structure is homogeneous and the consistency is paste like and easy to emulgate b agar luria after 24 hours of growth at 37 u00b0 c cultures form whitish semi transparent colonies 1 5 2 5 mm in diameter the surface of the colonies is smooth the edges are even the structure homogeneous and the consistency is paste like and easily emulgated c agarized adams medium after 40 48 hours of growth at 37 u00b0 c cultures form colonies 0 5 1 5 mm in diameter greyish white semi transparent slightly elevated with a shining surface d growth on meat peptone broth the specific rate of growth at 37 u00b0 c is 1 3 h 1 after 24 hours of growth a drastic homogeneous turbidity and characteristic odor are observed 3 physico biochemical traits growth along a prick of the meat peptone agar is even along the entire prick the microorganism is a facultative anaerobe it does not liquify gelantine grows well on milk and causes milk coagulation does not form indole resistant to streptomycin.