that could be seen clearly in the liquid LB medium, suggesting that strain 9#is a type of P. aeruginosa.A blue-green pigment formed in the medium with out Cd but was notpresent in the medium containing Cd, demonstrating that addition ofCd inhibits pigment formation. Formation of a blue-green pigment is acharacteristic ofP. aeruginosaand lack of pigment production indicatesa toxic concentration of Cd since pigment production is switched off as asurvival mechanism