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Uptake of the toxic heavy-metal, thallium, was studied in the cyanobacterium Synechococcus R-2 (PCC 7942) using clinically available 201 Tl + . Thallium was found to distribute across the plasmalemma passively, and so the accumulation ratio of the ion ([Tl + ]i/[Tl + ] o) could be used to calculate the apparent membrane potential (Ay/h0) of the cells ( e TI*o = .d^i>o). The permeability of the plasmalemma to Tl + ( P T1 + «1 to 5 nms" 1 ) is higher than that of K + . Valinomycin does not increase the permeability of Tl + . Transient changes in the Ay/ij0 of cells, because of electrogenic transport of ions, could be detected from its effects upon the uptake rate of Tl + . HCO3" hyperpolarized Synechococcus cells, whereas NH^, CH3NH+, and K + led to depolarization. The use of Tl + as a reporter of A t//it0 has

Uptake of Thallium, a Toxic Heavy-Metal, in the Cyanobacterium Synechococcus R-2 (Anacystis nidulans, S. Leopoliensis) PCC 7942