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The effect of zinc and cadmium on δ-aminolevulinate dehydratase of bovine erythrocytes stored at - 30 °C for different times was determined. The results show a. storage of erythrocytes leads to an enhancement of the enzyme activity, which after six weeks is 165% (500 μм ZnCl 2 ) respectively 220% (100 μм CdCl 2 ) for red blood cells of calves, and after four weeks is 420% respectively 450% (same concentrations) for red blood cells of adult cattle, b. the older the samples are, the higher is the metal concentration, needed for activation.

Effect of Zinc and Cadmium on δ-Aminolevulinate Dehydratase of Red Blood Cells in Protecting against Enzyme Losses during Storage