precursor

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precursor

 [pre-ker´ser]
something that precedes. In biological processes, a substance from which another, usually more active or mature substance, is formed. In clinical medicine, a sign or symptom that heralds another.

pre·cur·sor

(prē-kŭr'sŏr),
That which precedes another or from which another is derived, applied especially to a physiologically inactive substance that is converted to an active enzyme, vitamin, hormone, etc., or to a chemical substance that is built into a larger structure in the course of synthesizing the latter.
[L. praecursor, fr. prae-, pre- + curro, to run]

precursor

(prĭ-kûr′sər, prē′kûr′sər)
n.
A biochemical substance, such as an intermediate compound in a chain of enzymatic reactions, from which a more stable or definitive product is formed: a precursor of insulin.

pre·cur·sor

(prē'kŭrs-ŏr)
That which precedes another or from which another is derived, applied especially to a physiologically inactive substance that is converted to an active enzyme, vitamin, or hormone, or to a chemical substance that is built into a larger structure in the course of synthesizing the latter.
[L. praecursor, fr. prae-, pre- + curro, to run]

precursor

a form that precedes another. For example:
  1. (a) a substance that precedes and is involved in the synthesis of a compound, such as any of the intermediates in the synthesis of an AMINO ACID.
  2. (b) a cell from which other cells develop.
  3. (c) a molecule that is subjected to modification to provide an active molecule, such as the enzymic cleavage of TRYPSINOGEN to yield TRYPSIN (see ZYMOGEN).

pre·cur·sor

(prē'kŭrs-ŏr)
That which precedes another or from which another is derived.
[L. praecursor, fr. prae-, pre- + curro, to run]
References in periodicals archive ?
The DNC, however, lacks sufficient staff and equipment to detect and interdict precursors consistently.
The answer is that die sperm precursors are somewhere in between.
As no extra Se-vapor source was supplied, the amount of Se that can react with In/Cu-Ga precursors, during annealing, is determined by the working pressure in the reaction chamber.
While most precursors contribute only one element to a film regardless of the complexity of the substance, there are some compounds that do supply more than one element.
Li et al., "A modular ex situ conversion process for thick MOD-fluoride RBCO precursors," IEEE Transactions on Applied Superconductivity, vol.
The data in Figure 1 indicated that the precursors were plate-like particles.
Finally, the proposal also aims to establish a European database on drug precursors that will list EU-licensed and registered businesses.
The main objective of the forum this year is identifying the importance of the precursors, the extent of the contribution of precursors and essential chemicals in the manufacturing of various drugs and the extent of local and international experience in dealing with the precursors, he said.
Hematopoietic precursor stem cells give rise to all red and white blood cells and platelets in the body.
The global high-k and ALD/CVD metal precursors market size is projected to reach USD 789.8 million by 2025 expanding at a CAGR of 8.3% from 2019 to 2025
According to a report by the American think tank Rand Corp., China is 'increasingly a leading source' of methamphetamine precursors or chemicals that by themselves were legitimate but when combined become some of the world's most dangerous and addictive drugs.