Answers are grounded in this paper and cite their sources.
The absorption of rubidium by excised barley roots from solutions containing calcium was a strictly linear function of time for 1 hour and was temperature-sensitive throughout; there was no evidence of an initial nonmetabolic exchange phase of uptake. The rubidium absorbed reached concentrations many times the external concentration without any slackening of the rate of absorption-evidence for a high degree of irreversibility of the overall absorption process. This is discussed in terms of the "enzyme-kinetic" model of ion transport by carriers.
No takes yet. Share an insight, caveat, or question.
Epstein et al. (1962) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: