nonchromogenic


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non·chro·mo·gen·ic

(non'krō-mō-jen'ik)
Nonphotoreactive; pertains to lack of pigment production when colonies are exposed to light.

nonchromogenic

not producing colored pigments. Said of bacteria, e.g. nonchromogenic Mycobacterium spp.
References in periodicals archive ?
In screening, some lipoproteins were dissociated to water and oxygen by actions of cholesterol esterase/ oxidase and catalase to form a nonchromogenic product in step 1.
Cultures in liquid and solid media grew a nonchromogenic mycobacterium from sputum and stool samples; results were negative for urine samples.
All isolates yielded smooth to greasy domed nonchromogenic colonies in culture (online Technical Appendix Figure, wwwnc.
The colonies were nonchromogenic, smooth to mucoid, and off-white to cream on Middlebrook 7HI0 and trypticase soy agar.