Search the CONFOCAL archive at http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal hi, you might also try kisker-biotech: http://www.kisker-biotech.com/micro_silicia.htm cheers arwed -- arwed weigel universitaet goettingen abteilung fuer neurophysiology und zellulaere biophysik humboldtallee 23 37073 goettingen 0551/395918 [log in to unmask]