Dear colleagues, Does somebody know the relationship between J and c for lipids in the ultracentrifuge? Thank you in advance Christine Christine EBEL Institut de Biologie Structurale, UMR 5075 CEA-CNRS-UJF 38 027 Grenoble Cedex 1, France. Tel: (33) 4 38 78 96 38 Fax: (33) 4 38 78 54 94 Email: Christine.Ebel at ibs.fr