Search the CONFOCAL archive at http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal Hi firends, do you have any data about hydrodynamic radius and diffusion coefficients related to FITC. Thanks ALby ------------------------------------------------------------------------ -------------------------- Alberto Diaspro Department of Physics, University of Genoa Via Dodecaneso 33, 16146 Genoa Italy voice +390103536426/480, facsimile +39010314218 visit http://www.lambs.it; http://www.wiley.com/WileyCDA/WileyTitle/productCd-0471409200.html