Abstract
WORK with many kinds of plants has shown that the uptake of rubidium is often so similar to the uptake of potassium that rubidium-86 can be used as a tracer for potassium1. MacRobbie and Dainty2, however, found that in the alga Nitellopsis the fluxes of rubidium at the plasmalemma were less than those of potassium. It was suggested2 that rubidium was unable to take part in active transport mechanisms in the same manner as potassium. Adrian3 has also shown that the permeability of frog muscle fibres to rubidium is much less than their permeability to potassium.
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