1. Department of Chemistry, University of Auckland, Private Bag 92019, Auckland, New Zealand
2. National Institute of Water & Atmospheric Research (NIWA) Ltd, PO Box 893, Nelson, New Zealand
3. Swiss Tropical and Public Health Institute, Socinstrasse 57, PO Box CH-4002, Basel, Switzerland, and University of Basel, CH-4003 Basel, Switzerland
4. Laboratoire des Molécules de Communication et Adaptation des Micro-organismes, FRE 3206 CNRS, Muséum National d’Histoire Naturelle, 57 Rue Cuvier (C.P. 54), 75005 Paris, France
5. Malaghan Institute of Medical Research, PO Box 7060, Wellington South, New Zealand
6. NIWA, Private Bag 14-901, Kilbirnie, Wellington, New Zealand