Fig. 1
From: The proteins of Fusobacterium spp. involved in hydrogen sulfide production from L-cysteine
The protein expression of different bacterial strains grown in broth without cysteine was examined with gel electrophoresis. With Coomassie staining (a) all proteins were stained. However, the in-gel activity assay with bismuth staining (b) only detected the proteins that produced hydrogen sulfide (H2S) from cysteine. Sulfide from H2S reacted with bismuth and formed bismuth sulfide, a brown to black precipitate