MOLECULAR ANALYSIS OF A MICROAEROBICALLY INDUCED OPERON REQUIRED FOR HYDROGENASE SYNTHESIS IN RHIZOBIUM-LEGUMINOSARUM BIOVAR VICIAE - REY, L; MURILLO, J; HERNANDO, Y; HIDALGO, E; CABRERA, E; IMPERIAL, J; RUIZARGUESO, T; (Molecular Microbiology, 1993)