If an organism is motile than the growth will radiate from the stab mark and make the entire tube appear turbid. Pseudomonas aeruginosa and the strain of Proteus mirabilis that we work with are motile ...
When the electron donor is oxidized by cytochrome oxidase it turns a dark purple. This is considered a positive result. In the picture below the organism on the right (Pseudomonas aeruginosa) is ...
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