1. Institut de Physique Nucléaire, CNRS-IN2P3, 91406 Orsay, France, Equipe “Endotoxines”, UMR 8619 du CNRS, IBBMC, Université de Paris-Sud, 91405 Orsay, France, Ionwerks, Inc., 2472 Bolsover Street, Suite 255, Houston, Texas 77030, and NIDA IRP, 5500 Nathan Shock Drive, Baltimore, Maryland 21224