(19)

(11)

EP 0 680 610 A1

(12)

(43) Date of publication: 08.11.1995 Bulletin 1995/45 (21) Application number: 94904294.0 (22) Date of filing: 21.01.1994

(51) International Patent Classification (IPC):  G01N 33/ 52( . ) G01N 33/ 94( . ) G01N 33/ 70( . ) (86) International application number: PCT/GB1994/000117 (87) International publication number: WO 1994/017416 (04.08.1994 Gazette 1994/18)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI NL SE (30) Priority: 22.01.1993 GB 19930001288 (71) Applicant: UNIVERSITY OF BIRMINGHAM Edgbaston, Birmingham B15 2TT (GB)	(72) Inventor: COPE, Graham Francis Northfield, Birmingham B31 2DB (GB) (74) Representative: Pearce, Anthony Richmond, et al  MARKS & CLERK, Alpha Tower, Suffolk Street Queensway Birmingham B1 1TT Birmingham B1 1TT (GB)