N M Allinson, University of York, YO1 5DD. C P J Barty, University of California, La Jolla CA 92093-0339. A R Battersby, University Chemical Laboratory, University of Cambridge. M Ben-Nun, University of California, La Jolla CA 92093-0339. D Bourgeois, ESRF, BP220, 38043 Grenoble Cedex. G Bradbrook, University of Manchester, M13 9PL. J W Campbell, Daresbury Laboratory, Warrington WA4 4AD. P D Carr, Australian National University, Canberra. A Cassetta, University of Manchester, M13 9PL. C H Chao, National Tsinghua University, Taiwan. P Chen, University of California, Irvine CA 92717. A Deacon, University of Manchester, M13 9PL. H E Elsayed-Ali, Old Dominion University, Virginia 23529-0246. J D Ewbank, University of Arkansas, Fayetteville, Arkansas 72701. T Guo, University of California, La Jolla CA 92093-0339. J Habash, University of Manchester, M13 9PL. A Hädener, University of Basel, Switzerland. A A Hauer, Los Alamos National Laboratory. J R Helliwell, University of Manchester, M13 9PL. M Helliwell, University of Manchester, M13 9PL. R Henderson, MRC Laboratory of Molecular Biology, Cambridge CB2 2QH. .A. Ikhlef, INRS Energie et Materiaux, Varennes J3X 1S2, Canada.A A Ischenko, Lomonosov Moscow University, Moscow 119899. Z. Jiang, INRS Energie et Materiaux, Varennes J3X 1S2, Canada.J.-C. Kieffer, INRS Energie et Materiaux, Varennes J3X 1S2, Canada.G A Kyrala, Los Alamos National Laboratory. B C Larson, Oak Ridge National Laboratory, Tennessee 37831-6030. R Lewis, Daresbury Laboratory, Warrington WA4 4AD S H Lin, Institute of Atomic and Molecular Sciences, Taiwan W.-K. Liu, Institute of Atomic and Molecular Sciences, Taiwan.K Moon, University of York, YO1 5DD. G Mourou, University of Michigan, Ann Arbor, MI 48109. J P Moy, ESRF, BP220, 38043 Grenoble Cedex. Y P Nieh, University of Manchester, M13 9PL. A C Niemann, University of Basel, Switzerland. J Raftery, University of Manchester, M13 9PL. F Ráksi, University of California, La Jolla CA 92093-0339. P M Rentzepis, University of California, Irvine CA 92717. C Rose-Petruck, University of California, La Jolla CA 92093-0339. L Schäfer, University of Arkansas, Fayetteville, Arkansas 72701. R I Smith, CLRC Rutherford Appleton Laboratory, Oxon OX11 0QX. E H Snell, University of Manchester, M13 9PL. J Squier, University of California, La Jolla CA 92093-0339. A W Thompson, Daresbury Laboratory, Warrington WA4 4AD. J Z Tischler, Oak Ridge National Laboratory, Tennessee 37831-6030. I V Tomov, University of Califiornia, Irvine CA 92717. S Trapani, University of Manchester, M13 9PL. N Unwin, MRC Laboratory of Molecular Biology, Cambridge CB2 2QH. T Ursby, ESRF, BP220, 38043 Grenoble Cedex. J S Wark, Clarendon Laboratory, Oxford 0X1 3PU. P M Weber, Brown University, Rhode Island 02912. R R Whitlock, Naval Research Laboratory, Washington, D. C. 20375. C C Wilson, CLRC Rutherford Appleton Laboratory, Oxon OX11 0QX. K R Wilson, University of California, La Jolla CA 92093-0339. M Wulff, ESRF, BP220, 38043 Grenoble Cedex. V V Yakovlev, University of California, La Jolla CA 92093-0339.