TABLE 1.
Pigment production by S. agalactiae in quasi-defined media
| Mediuma | Components (μg/ml)
|
Color of GBS colonies | ||
|---|---|---|---|---|
| Casamino acidsa | L-cysteineb | Defined amino acidsc | ||
| CAM | 5,000 | White | ||
| CAM-Cy | 5,000 | 50 | Orange-red | |
| AM | 550 | White | ||
| AM-Cy | 50 | 550 | Orange-red | |
a
See the text.
b
Glutathione, dithiothreitol, thioglycolic acid, ascorbic acid, and sodium metabisulfite can substitute for L-cysteine. See the text.
c
Final concentration in the medium, 50 μg/ml of each of the following amino acids: L-arginine, L-histidine, L-isoleucine, L-leucine, L-lysine HCl, L-methionine, L-phenylalanine, L-threonine, L-tryptophan, L-tyrosine, and L-valine.