precursor

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precursor

a chemical substance that gives rise to another more important substance
References in classic literature ?
One glow of this kind, however, was often the precursor of gloom for many hours afterward; because, when the glow left him, he seemed conscious of a missing sense and power, and groped about for them, as if a blind man should go seeking his lost eyesight.
Whether it be Providence or Fate, Gutenburg is the precursor of Luther.
Rarity, as geology tells us, is the precursor to extinction.
Against this ebullition of wounded female pride, the experienced husband made no other head, than by an occasional exclamation, which he intended to be precursor of a simple asseveration of his own innocence.
But he had no opportunity of pondering over his love just then, for Bob Sawyer's return was the immediate precursor of the arrival of a meat-pie from the baker's, of which that gentleman insisted on his staying to partake.
He will find it as sure a precursor of his fate as Openshaw did before him.
There were, however, exceptional authors, genuine artists, masters of meter and narrative, possessed by a true feeling for beauty; and in some of the romances the psychological analysis of love, in particular, is subtile and powerful, the direct precursor of one of the main developments in modern fiction.
The objectives of the operation include practical implementation of anti-trafficking techniques specifically those aimed at precursors, effective use of specialized equipment/techniques for tests as highlighted in standard operating procedures by the concerned authorities, mapping of licit trade in the designated substances, streamlining and improvement of intelligence sharing on seizures of chemicals, establishing risk indicators by stopping shipments and risk profiling of the Acetic Anhydride, Acetyl Chloride, Acetic Acid and Ammonium Chloride.
The objectives of the operation include practical implementation of anti-trafficking techniques specifically those aimed at precursors, effective use of specialized equipment / techniques for tests as highlighted in standard operating procedures by the concerned authorities, mapping of licit trade in the designated substances, streamlining and improvement of intelligence sharing on seizures of chemicals, establishing establish risk indicators by stopping shipments and risk profiling of the Acetic Anhydride, Acetyl Chloride, Acetic Acid and Ammonium Chloride.
If they choose the wrong path, they will feel the same punishment citizens inflicted to their precursors.
Ring-structured lactams are precursors in the manufacture of nylons.
Microbe interactions with the precursors in the rhizosphere provide a continuous source of growth hormones to plants (Arshad and Frankenberger, 1998; Egamberdieva and Kucharova, 2009; Habig et al.