| Characteristics |
Alcaligenes odorans |
Bacillus subtilis |
Corynebacterium propinquum |
Pseudomonas aeruginosa |
| Gram staining |
Negative |
Positive |
Positive |
Negative |
| Cell shape |
Bacilli |
Bacilli |
Bacilli |
Bacilli |
| Motility |
Motile |
Motile |
Non motile |
Motile |
| Colony |
Thin, irregular |
Circular |
Slimy |
Round, raised |
| Catalase reaction |
Positive |
Positive |
Positive |
Positive |
| Nitrate reduction |
Negative |
Positive |
Positive |
Positive |
| H2S production |
Positive |
Negative |
Negative |
Negative |
| Indole production |
Negative |
Negative |
Negative |
Negative |
|
Fermentation Tests |
Negative |
Negative |
Negative |
Negative |
| Dextrose |
Negative |
Negative |
Negative |
Negative |
| Lactose |
Negative |
Negative |
Negative |
Negative |
| Sucrose |
Negative |
Positive |
Negative |
Negative |
| Starch Hydrolysis |
Positive |
Positive |
Negative |
Positive |
|
Oxidase Citrate Utilization |
Negative |
Positive |
Negative |
Positive |
|
