1. School of Chemistry, Science Centre South, University College Dublin, Dublin D04 N2E5, Ireland
2. Technology Department, Almac Sciences, Craigavon BT63 5QD, U.K.
3. Arran Chemical Company, Monksland Industrial
Estate, Roscommon N37 DN24, Ireland
4. Corning Reactor Technologies, Corning SAS, 7 bis Avenue de Valvins, CS 70156 Samois sur Seine, 77215 Avon Cedex, France