Check out the catalog of Amicon (Millipore) for Ultrafiltration. Devanagoud Patil wrote: > Dear Netters, > > Is there a filteration based method for large scale preparation of lambda > phage (instead of CsCl2 gradient centrifugation)? > > Thank you very much for your time and help. > > Deva Patil > Oxford > dpatil at bioch.ox.ac.uk > > ---