[J. Am. Chem. Soc., 2003] Real-Time Multicolor DNA Detection with Chemoresponsive Diffraction Gratings and Real-Time Multicolor DNA Detection with Chemoresponsive Diffraction Gratings and Nanoparticle Probes (Ryan C. Bailey, Jwa-Min Nam, Chad A. Mirkin,* and Joseph T. Hupp*)