photochromogen

photochromogen

 [fo″to-kro´mo-jen]
a microorganism whose pigmentation develops as a result of exposure to light. adj., adj photochromogen´ic.

photochromogen

[-krō′məjen]
1 a pigment that develops as a result of exposure to light.
2 a type of mycobacterium that is nonpigmented in the dark but produces a yellow pigment on constant exposure to light.

photochromogen

(fō-tō-krō′mō-jĕn) [″ + chroma, color, + gennan, to produce]
Certain microorganisms in which a pigment develops when it is grown in the presence of light, such as Mycobacterium kansasii.

photochromogen

a microorganism whose pigmentation develops as a result of exposure to light. A characteristic of Runyon Group I mycobacteria.
References in periodicals archive ?
Define rapid grower, scotochromogen, photochromogen, and nonchromogen and provide examples of mycobacteria in each category.
It forms cream-colored colonies that turn yellow on exposure to light, hence the term photochromogens or group I atypical mycobacteria according to Runyon's scheme.