Brevibacterium
Brevibacterium linens is used in cheese ripening. Cheese ripening is allowing a second fermentation to occur. Cheese ripening causes formation of desirable flavors. Brevibacterium linens does this using its extracellular proteases.
Brevibacterium linens is gram-positive and non-motile. It is capable of growing in high salt concentrations and over a wide pH range.
Acetobacter
Acetobacter aceti is used to produce vinegar (acetic acid) from alcohol. It is a gram negative, aerobic rod with a diameter of 0.5–1.5 µm. It occurs as single cells, pairs, or chains. The cell can be either motile or non-motile.
Acetobacter aceti is an obligate aerobe.
Acetobacter aceti can oxidize ethanol to acetic acid and lactic acid to CO2 and H2O. It grows well from 25 to 30◦C. It is found naturally in fruits, sake, palm wine, cider, beer, sugarcane juice, tea fungus, and soil. Some species synthesize large amounts of cellulose.