Sorry Guys it was supposed to be mailed to Gerrit Hoogenboom not all, I am sorry for any trouble. Regards M.Bannayn University of Nottingham, Faculty of Agriculture, Department of Physiology and Environmental Sci. Tel: (44)- 115 - 9516260 - x: 8776 Fax: (44)- 115 - 9516261 E-mail: [log in to unmask] Homepage:http://www.ccc.nottingham.ac.uk/~sbxbam/mbahome.htm