Proteus penneri showing a green colour reaction with Kovacs' indole reagent.
All 33 investigated strains of Proteus penneri gave a green colour reaction with Kovacs' indole reagent after an incubation of about three days at 36 degrees C. Furthermore, 26% of the 51 strains of Proteus mirabilis studied also showed the green colour reaction but somewhat more weakly. The initial compound of this reaction seems to be a product of tryptophan metabolism which is formed only under aerobic conditions.
D003470:Culture Media; D007202:Indicators and Reagents; D007211:Indoles / Q000378:metabolism*; D011511:Proteus / Q000145:classification* / Q000378:metabolism; D011513:Proteus mirabilis / Q000145:classification; D013053:Spectrophotometry; D014364:Tryptophan / Q000378:metabolism
D003470:Culture Media; D007202:Indicators and Reagents; D007211:Indoles; D014364:Tryptophan