Response of Anabaena PCC 7120 to Nickel and Cadmium Stress

摘要

Anabaena PCC 7120 strain is sensitive to Ni~(2+) and Cd~(2+) and growth rates at various concentrations of these metals were assessed in terms of protein level. Tolerance limits for Ni~(2+) and Cd~(2+) are 1.2 mg L~(-1) (39 % level in growth kinetics) and 1.2 mg L~(-1) (48.99 % level in growth kinetics), respectively. Absorption/adsorption kinetics was estimated after 240 hrs of heavy metal treatments. For both the heavy metals, absorptions were higher than adsorption. Metal concentration and absorption were linearly related (r = 0.99; p>0.01). Sugar and pigment exhibited reduction due to heavy metal stress.