Dielectrophoretic collection rates of micro-organisms or other animate or inanimate dielectrically polarizable particles in suspension in a fluid are established by flowing the suspension past electrodes energized to produce a non-uniform alternating electric field in the suspension, terminating the...http://www.google.com.au/patents/US5344535?utm_source=gb-gplus-sharePatent US5344535 - Dielectrophoretic characterization of micro-organisms and other particles