Semiconductor Nanocrystals as Fluorescent Biological Labels Marcel Bruchez Jr., Mario Moronne, Peter Gin, Shimon Weiss,* A. Paul Alivisatos* Science 1998, 281, 2013 and Quantum Dot Bioconjugates for Ultrasensitive Nonisotopic Detection Warren C W Chan and Shuming Nie Science 1998, 281, 2016Â