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potential change from - 7.1 mV to 16 . 4niV, led to the reversal of the shape changing properly of the drugs to cup formers. The cellular uptake of drug increased with increasing membrane potential. The membrane potential dependent shape change was also reversible on revering the membrane potential. The results suggest that cellular uptake of drug and drug induced cell shape change was
strongly dependent on changes in the extracellular chloride concentration which alter the potential across the erythrocyte membrane. These findings may be of medical significance such as in the design of drugs, for example, for sickle cell diseases, malarial diseases, since knowledge of the concentration and location of the molecules with respect to the membrane surface is required.