Error:URL rejected: Malformed input to a URL function *correspondingauthor.tel.: 41 21 693 31 91;fax: 41 21 693 36 80.e Mailaddress:urs.vonstockar@epfl.ch(u.vonstockar).www.elsevier.com/locate/biotechadvbiotechnologyadvances21(2003)417 - PowerPoint Presentations and PDF Documents