Clay Minerals Change the Toxic Effect of Cadmium on the Activities of Leucine Aminopeptidase

Table 1

Changes in the kinetic constants ( and ) of LAP by different concentrations of Cd.

	Purified enzyme			Red soil			Purple soil
	0 μmol L^-1	4 μmol L^-1	10 μmol L^-1	0 μmol L^-1	4 μmol L^-1	10 μmol L^-1	0 μmol L^-1	4 μmol L^-1	10 μmol L^-1
	64.88^A	50.58^B	41.06^C	327.56^A	194.93^B	159.41^C	2167.45^A	2054.84^A	1558.41^B
	30.43^a	34.65^a	49.05^a	55.73^a	36.22^a	38.72^a	48.81^a	43.27^a	30.69^a
	0.96	0.97	0.97	0.97	0.99	0.97	0.97	0.99	0.97

Different capital letters indicate significant differences in (), and different lowercase letters indicate significant differences in (), with in nmol μg^-1 h^-1 in purified enzyme and nmol g^-1 h^-1 in soil enzyme and in μmol L^-1. Tables 2–4 are the same.