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We report the delivery of quantum dot (QD) fluorescence probes into mammalian cells by electroporation and endocytosis. The pH sensitivity of mercaptoacetic-acid-capped CdSe/ZnSe/ZnS quantum dots (MAA QDs) was investigated in both solution and living cells, demonstrating the potential of QDs as an intracellular pH sensor with long-term photostability and limited photobleaching. Further, QDs were utilized...
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