(19)

(11)

EP 0 175 732 A1

(12)

(43) Date of publication: 02.04.1986 Bulletin 1986/14 (21) Application number: 85901481.0 (22) Date of filing: 15.03.1985

(51) International Patent Classification (IPC):  G01N 27/ 416( . ) (86) International application number: PCT/GB1985/000101 (87) International publication number: WO 1985/004482 (10.10.1985 Gazette 1985/22)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 27.03.1984 GB 19840007835 (71) Applicant: University of Strathclyde Glasgow G1 1YQ, Scotland (GB)	(72) Inventor: HALLING, Peter Glasgow G4 9HX (GB)