The rates of cellular absorption of DL-leucine from solutions of different concentrations indicate the presence of dual uptake mechanisms in root tips of Lemna minor, one in the low (0.01 to 0.2 mM) and the other in the high (5 to 25 mM) concentration range. The absorption pattern for the lower concentrations conforms to Michaelis-Menten kinetics.
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Ronald J. Newton (1974) studied this question.