Density gradient centrifugation.
Card's contents:CHARD T. /współaut./ 536,346 HINTON RICHA.RD, DOBROTA MILOSLAV Density gradient centrifugation. Part 1. CHARD T. An introduction to radioimmunossay and related techniques. Part 2. Amsterdam 1978 North—Holland Publ. Co. 8° s. VIII, 534, il. Laboratory Techniques in Biochemistry and Molecular Biology vol.6.