Hi Daniel, As a post-script to my earlier posting, you might be interested in this reference. Included is a graphical representation of bacterial counting over six orders of magnitude and corresponding precision. I actually do not have access to the article at the moment but I know it illustrates the lowest sensitivity we were able to achieve. Cheers, james Development of a Vital Fluorescent Staining Method for Monitoring Bacterial Transport in Subsurface Environments Appl. Envir. Microbiol. 2000 66: 4486-4496. ----------------------------------------------------------------------------------------------------------------------- James A. Hall Ph.D. *** NB. Currently in Glenharvie, South Africa ***** Research Associate, Field house 011 752 2520 Dept Geosciences cell 082 370 1229 Princeton University. field web site http://home.mweb.co.za/ja/jahall Phone 609 258 2597 Fax 609 258 1274 -----------------------------------------------------------------------------------------------------------------------
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