| Characteristic | S2 | S7 | Pseudomonas1 | Acinetobacter2 |
| Colony morphology |
|
|
|
|
| Form | Round | Round | Round | Round |
| Size (mm) | 3 - 5 | 2 - 3 | Small | 0.5 - 2 |
| Color | Translucent | Yellowish | Yellow | Translucent, opaque |
| Cell morphology | Short rod Coccobacillus-like | Long rod Bacillus-like | Long rod Bacillus-like | Short rod Coccobacillus-like |
| Motility | − | + | + | +/− |
| Physiology Hydrocarbons utilization | + | + | + | + |
| Substrates fermented |
|
|
|
|
| Glucose | + | + | + | +/− |
| Lactose | − | − | − | +/− |
| Citrate | + | + | + | +/− |
| Respiratory metabolism | Strictly aerobic | Strictly aerobic | Strictly aerobic | Strictly aerobic |
| Optimal growth temperature | 37˚C | 37˚C | 30˚C - 35˚C | 30˚C - 37˚C |
| Biochemical characteristics |
|
|
|
|
| Gram stain | − | − | − | − |
| Oxidase | − | + | + | − |
| Catalase | + | + | + | + |
| ONPG | − | − | − | − |
| ADH | − | + | + | − |
| LDC | − | − | − | − |
| ODC | − | − | − | − |
| H2S | − | − | − | − |
| Indole | − | − | − | − |