[1] UCL, Dept Biochem Engn, London, England
[2] Sartorius Stedim Biotech, Royston, England
[3] Sartorius Stedim France SAS, Aubagne, France
[4] Sartorius Stedim Austria GmbH, Vienna, Austria
[5] Sartorius Stedim Biotech GmbH, Gottingen, Germany
[6] Univ Birmingham, Chem Engn, Birmingham, W Midlands, England