List of Contents Number 1-2 Theory and experiment in the foundations of quantum theory M.A.B. Whitaker Department of Pure and Applied Physics, The Queen’s University of Belfast, Belfast BT7 INN, Northern Ireland Number 3-4 Light harvesting for quantum solar energy conversion Tomas Markvart School of Engineering Sciences, University of Southampton, Southampton SO171BJ, UK Number 5 Light in elementary biological reactions Villy Sundstr6m Department of Chemical Physics, Lund University, P.O. Box 124, S-22100 Lund, Sweden Volume Contents Number 6 Group Ill-nitride based hetero and quantum structures B. Monemar, G. Pozina Department of Physics and Measurement Technology, LinkOping University, S-58183 Linkoping, Sweden Book reviews