His granddaughter HÃ lÃ ne Langevin-Joliot is a professor of nuclear physics at the University of Paris and his grandson , Pierre Joliot , who was named after him , is a noted biochemist . Their granddaughter HÃ lÃ ne Langevin-Joliot is a professor of nuclear physics at the University of Paris , and their grandson Pierre Joliot , who was named after Pierre Curie , is a noted biochemist .