S. Angal, R. Beynon, M. Dunn, & E.L.V. Harris: Introduction; G. Goodwin, M. Hartley, D. Griffiths, N. Lambert, T. Salusbury, & P. Whittington: Extraction; S.D. Roe & M. Scawen: Separation of the basis of charge; S. Angal, P. Dean, R. Beynon, M. Cussack, C. Hill, L. Goulding, A. Kenney ,& C. Sutton: Separation by exploitation of activity; A. Preneta: Separation on the basis of size