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A pigment precursor.
A microorganism capable of producing color under suitable conditions.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



according to the color theory devised by O. Witt, a substance containing chromophores—groups of atoms responsible for the coloration of various compounds. The term was also used to designate colorless substances found in animal and plant tissues that become pigments as a result of oxidation. V. I. Palladin proposed the term “respiratory chromogen” as part of his theory of plant respiration in reference to substances that become pigments through reversible oxidation. The equivalent Russian term is no longer used in the literature.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Extrinsic tooth staining can be caused by compounds that are incorporated into the pellicle and produce a stain consequently to their basic color (chromogen), or those that lead to staining caused by chemical interaction at the tooth surface, which is usually associated with cationic antiseptics and metal salts.
Only the two cell types with acidophilic granules in the hypobranchial gland showed a histochemically strong positive reaction for tryptophan, indicating that in these cells there are high concentrations of the precursors or chromogens for "Tyrian Purple."
New stable and vivid chromogens available in red, green and blue and the new PROMARK"" canine detection provide IHC flexibility.
Since MART1 is a cytoplasmic marker and Ki-67 is a nuclear marker, by using 2 different systems (eg, ABC and alkaline phosphatase) with 2 different chromogens (eg, diaminobenzidine [brown] and aminoethylcarbazole [red]), it is relatively easy to identify which cells express both markers, thus representing the fraction of melanocytes that are proliferating.
The secretion contains, besides mucus and biologically active compounds, minute amounts of chromogens, which develop enzymatically and under the influence of light and oxygen into a purple pigment known as "Tyrian purple," "Royal purple," or "Shellfish purple." Throughout history, humans have used the pigment for various purposes.
Increasingly we may see multimodality correlations across a variety of platforms with other ancillary molecular assays, proteomics, genomics, and transcriptomics in tissue, plasma, serum, and body fluids, and development of multiple chromogens for simultaneous detection.
The intelliPATH FLX is a fully open, random-access immunohistochemistry staining instrument, that has STAT capability with priority processing, rapid four-step multistaining and on-board preparation of chromogens and reagents.
We compared the results obtained with the two chromogens on 66 liver biopsies from patients with chronic liver diseases hospitalized in the Department of Hepatogastroenterology of the Pitie-Salpetriere Hospital.
Other changes include a darkening of the urine color, due to oxidation of colorless chromogens such as the oxidation of urobilinogen to urobilin, or a change in color as bilirubin is oxidized to biliverdin.
Uber die Eigenschaften eines neuen Chromogens fur die Blutzuckerbestimmung nach der GOD/POD-Methode.