Professor Peter Ortoleva, Indiana University.  Special Lecture.  Nanosystems Understodd Multiscale Way:  Nanoreactors and Vaccines.  Abstract:   Nanosystems evolve via processes coupled across scales from the atomic to the hundreds of nanometers, and femtoseconds to microseconds. Multiscale theoretical approaches are used to arrive at computational algorithms that achieve a quantitative understanding of structural and chemical kinetic phenomena expressed in these systems. Perturbation, factorization and variational methods are used. Applications in nanomedicine, energy resource generation, and environmental remediation are discussed. As the systems involved contain millions of atoms and the phenomena of interest take place on nanoseconds to microseconds or longer, multiscale approaches are essential for achieving both a fundamental understanding and computer-aided design.