1. Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, USA
2. Istituto di Biologia e Biotecnologia Agraria, C.N.R., Via Bassini 15, 20133 Milano, Italy
3. Photosynthesis Research Unit, Centro Studi sulla Biologia Cellulare e Molecolare delle Piante, C.N.R., Milano, Italy
4. Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA