Antimicrob Agents Chemother. 1976 August; 10(2): 215-218 Richmond, Clark and Wotton (1976) :-) Carol Smee Senior Scientist Prolysis Ltd. Unit 6, Begbroke Science Park Sandy Lane, Yarnton Oxfordshire. OX5 1PF, UK +44 (0) 1865 854700 www.prolysis.com