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Fluorescent dyes have been widely employed as optical indicators of the membrane potential difference in cells, isolated organelles and lipid vesicles that are too small to make microelectrode measurements feasible. We describe here the application of a carbocyanine dye, 3,3′-dipropylthiodicarbocyanine iodide [DiS-C3-(5)], to monitor the transmembrane potential changes induced by a variation of the K + concentration for the cells of Escherichia (E.) coli and photosynthetic bacteriumdoi:10.2116/analsci.19.1239 pmid:14516073 fatcat:lysntjoiubaurc6r5ufez4xcwi