00542naa a2200181 a 450000100080000000500110000800800410001910000180006024501260007826000090020465000180021365000120023165300250024365300110026870000210027970000170030077300430031715992571995-06-27       1976    bl ---       0--  u    #d1 aLUDLOW, M. M.  aA technique for determining the proportion of C3 and C4 species in plant samples using stable natural isotopes of carbon.  c1976  aFotossíntese  aMétodo  aFISIOLOGIA DA PLANTA  aVIA C41 aTROUGHTON, J. H.1 aJONES, R. J.  tJ. Agric. Sci.gv.87, p.625-632, 1976.