(19)

(11)

EP 0 449 925 A1

(12)

(43) Date of publication: 09.10.1991 Bulletin 1991/41 (21) Application number: 90900940.0 (22) Date of filing: 27.12.1989

(51) International Patent Classification (IPC):  A01N 1/ 00( . ) G01N 1/ 30( . ) (86) International application number: PCT/GB1989/001540 (87) International publication number: WO 1990/007703 (12.07.1990 Gazette 1990/16)

(84) Designated Contracting States: AT BE CH DE ES FR GB IT LI LU NL SE (30) Priority: 23.12.1988 GB 19880030197 (71) Applicant: University of Dundee Dundee DD1 4HN, Scotland (GB)	(72) Inventors: CARMICHAEL, Ann Dundee DD2 1TU (GB) COGHILL, George, Reid Dundee DD2 3HP (GB) (74) Representative: Pattullo, Norman  Murgitroyd and Company 373 Scotland Street Glasgow G5 8QA Glasgow G5 8QA (GB)