Abstract
1.1.The initial flux of l-tryptophan in “exchange diffusion” and in “competition” experiments with other amino acids is significantly increased by certain of the amino acids.2.2.For the straight-chain amino acids with aliphatic side chains, there is a progressive, almost constant increase in the stimulatory effect obtained in these experiments for each additional CH2 group in the side chain.3.3.In the competition experiments, branching the chain, decreases the stimulation of initial flux.4.4.A model of the transport system in which the ratio of amino acid to carrier is I:I can predict the stimulation in the exchange-diffusion experiments. An Amino acid to carrier ratio of 2:1 must be assumed to also predict the stimulation observed in competition experiments.
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