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A pigment precursor.
A microorganism capable of producing color under suitable conditions.



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.

References in periodicals archive ?
The literature reports that related species of muricids produce various shades of purple, depending on the number and concentration of different chromogens, and the quantity of liquid produced varies greatly from one species to the next.
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.
Peroxidase systems generally use 3,3'-diaminobenzidine (DAB) (brown) or 3-amino-9-ethylcarbazole (AEC) (red) chromogens.
Uber die Eigenschaften eines neuen Chromogens fur die Blutzuckerbestimmung nach der GOD/POD-Methode.
Preanalytical factors aside [8-10], interfering chromogens include several other ordinary side-products of lipid autooxidation, alkanals, alkenals, and alkadienals as well as bile pigments, cyclic peroxides, carbohydrates, and amino acids X11-18].
Indianapolis, IN) was considered advantageous in our laboratory because the method decreases negative interference from chromogens such as bilirubin and hemoglobin [6, 7].