The unique properties of quantum dots allow them to be optimized for voltage sensing and for light-controlled electrical activation of cells.Dr. Elena Molokanova, Joseph A. Bartel, Dr. Weiwen Zhao, Dr. Imad Naasani, Dr. Michael J. Ignatius, Dr. Joseph A. Treadway, Dr. Alex Savtchenko, Invitrogen Corp.Quantum dots are transforming life sciences imaging because of their extraordinary photostability, brightness, broad excitation, narrow emission, long fluorescence lifetimes and multiplexing capability. The nanometer-scale inorganic crystals contain a few hundred to a few thousand atoms of a semiconductor material, and their behavior is governed by the laws of quantum physics. 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