Institution: | (1) Nitrogen Fixation Laboratory, John Innes Centre, Norwich, NR4 7UH, UK e-mail: david.lowe@bbsrc.ac.uk, Tel.: +44-1603-456900 ext 2742, Fax: +44-1603-454970, GB;(2) School of Chemistry, Physics and Environmental Science, University of Sussex, Brighton, BN1 9QJ, UK, GB |