00403naa a2200145 a 450000100080000000500110000800800410001910000180006024500600007826000090013865000140014765300280016170000180018977300500020716025931995-06-27       1941    bl ---       0--  u    #d1 aPHELPS, A. S.  aOccurrence of hydrogenase in nitrogen fixing organisms.  c1941  aRhizobium  aBIOQUIMICA E FISIOLOGIA1 aWILSON, P. W.  tProc. Soc. Exp. Biol.gv.47, p.473-476, 1941.