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.
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.
A bronchoalveolar lavage was performed; samples yielded in culture Pseudomonas aeruginosa and a nonchromogenic mycobacterium.
All isolates yielded smooth to greasy domed nonchromogenic colonies in culture (online Technical Appendix Figure, wwwnc.cdc.gov/EID/pdfs/11-0888Techapp.pdf).
The colonies were nonchromogenic, smooth to mucoid, and off-white to cream on Middlebrook 7HI0 and trypticase soy agar.