in a series of experiments , it is demonstrated that the trace element vanadium ( 4.10 ( -7 ) g-at/1 as nh4vo3 ) has a considerable positive influence on the synthesis of delta-aminolevulinic acid ( delta-ala ) in the autotrophically growing green alga chlorella pyrenoidosa , the effect being visible by an enhanced output of the amino acid into the culture medium in presence of levulinic acid ( la ) .
C0002563
delta-ala
C0002520
amino acid