hydrolase that breaks down cysteine by the addition of H2O resulting in the production of hydrogen sulfide gas (H2S)

used to reduce SO32- resulting in the production of H2S

depending on the bacterias enzymes different by-products will result when different substrates are used

Semisolid

determines motility - organism will appear as fuzzy growth (inoculated with a needle and with no caffeine shakes)

Detect the presence of indole- is an aromatic heterocyclic organic compound)

H2S is produced is reacts with ferrous ammonium sulfate making an insoluble black participate along line of inoculating. (presence of it indicates organism is a H2S producing organism)