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Distribution of 109Cd in different fractions of shoots of maize plants grown hydroponically for 7 d; two treatments were used (109Cd, 34 nm 109Cd; 109Cd + Si, 34 nm 109Cd + 5 mm Si). Values are means of six different replicates. CW, cell-wall fraction; ORG, organelle-rich fraction; SOL, soluble fraction. Asterisks indicate significant differences among the treatments at P < 0·05 %.
