Characteristics | LAB-A | LAB-B |
Colony Color | White | Creamy White |
Colony Shape | As a surface colony, they are Small, irregular, Cottony-fluffy colonies | As a surface colony, they are Large, Circular, Lenticular colonies in middle of the medium |
Surface | Rough | Smooth |
Elevation | Convex to umbonate | Raised |
Margin | Undulate | Entire |
Gram staining | + | + |
Catalase test | − | − |
Milk coagulation test | + | + |
NaCl tolerance test |
|
|
1.5% | + | + |
2.5% | + | − |
3.5% | + | − |
4.5% | − | − |
Possibility of strains | L. acidophilus | L. bulgaricus |