00869nam a2200313 a 450000100080000000500110000800800410001910000160006024500320007626000410010830000100014949000660015965000150022565000230024065000240026365000200028765000190030765000280032665000270035465000130038165000300039465000120042465000190043665000180045565000140047365000240048765000240051170000200053510005722014-02-22       1993    bl uuuu     u00u1 u    #d1 aKNOWLES, R.  aNitrogen isotope techniques  aLondres (Inglaterra): Academicc1993  a311p.  aIsotopic techniques in plant, soil and aquatic biology series  aANABOLISMO  aBIOLOGIA DEL SUELO  aCICLO BIOGEOQUIMICO  aDENITRIFICACION  aESPECTROMETRIA  aESPECTROMETRIA DE MASAS  aFIJACION DEL NITROGENO  aISOTOPOS  aMETABOLISMO DEL NITROGENO  aMETODOS  aMINERALIZACION  aNITRIFICACION  aNITROGENO  aREACCIONES QUIMICAS  aTECNICAS ANALITICAS1 aBLACKBURN, T.H.