Arup Kumar Raychaudhuri  Director and Senior Professor S N Bose National Centre for Basic Sciences JD Block, Sector III Salt Lake City Telephone +91-33-23355706/7/8 Ext 208, Ext 408, 2335 5709 (direct) Fax +91-33-23353477, 2335 1364 (direct) e-mail: arup@bose.res.in