photochromogen

photochromogen

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

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.
References in periodicals archive ?
* Define rapid grower, scotochromogen, photochromogen, and nonchromogen and provide examples of mycobacteria in each category.
Mycobacterium marinum is a photochromogen classified as a Mycobacterium organism other than Mycobacterium tuberculosis (MOTT), and is known to cause human skin infection.[6] This aquatic organism can usually be cultured at 22 [degrees]C to 33 [degrees]C on Lowenstein-Jensen medium, but in general will not grow well at 37 [degrees]C.[2] A careful patient history will reveal exposure to contaminated fish or an injury that occurred in contaminated waters such as in an aquarium, swimming pool, ocean, lake, or river.[2] Patients usually present with reddish papules, nodules, or pustules on the affected area, which manifest over a period of 3 weeks following initial trauma (Figure 1).
Nontuberculous mycobacteria are also called as atypical mycobacteria and are classified into: 1) Photochromogens 2) Scotochromogen 3) Nonchromogens 4) Rapid growers.